OCaml HTML5 parser/serialiser based on Python's JustHTML
anil.recoil.org
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.claude/settings.local.json
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.claude/settings.local.json
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OCAML-FUZZING.md
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OCAML-FUZZING.md
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# OCaml Fuzzing with Crowbar
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This guide covers setting up property-based fuzz testing for OCaml libraries using [Crowbar](https://github.com/stedolan/crowbar). Crowbar supports two modes:
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1. **QuickCheck mode** - Fast, deterministic testing without AFL (good for CI)
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2. **AFL mode** - Coverage-guided fuzzing with American Fuzzy Lop
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## Quick Start
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### 1. Add Dependencies
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Add `crowbar` to your opam dependencies:
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```bash
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opam install crowbar
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```
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### 2. Create Fuzz Test Directory
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Create a `fuzz/` directory at the root of your project:
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```
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project/
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โโโ lib/
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โโโ fuzz/
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โ โโโ dune
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โ โโโ fuzz_mylib.ml
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โโโ dune-project
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```
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### 3. Add Dune Configuration
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Create `fuzz/dune`:
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```lisp
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(executable
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(name fuzz_mylib)
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(libraries mylib crowbar))
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```
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For multiple fuzz targets:
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```lisp
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(executable
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(name fuzz_parser)
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(libraries mylib crowbar))
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(executable
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(name fuzz_encoder)
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(libraries mylib crowbar))
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```
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### 4. Write Fuzz Tests
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See [Test Structure](#test-structure) below for patterns and examples.
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### 5. Run Tests
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**QuickCheck mode** (no AFL required):
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```bash
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dune exec ./fuzz/fuzz_mylib.exe
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```
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**AFL mode** (requires AFL instrumentation):
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```bash
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# Build with AFL instrumentation
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dune build --context afl
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# Run AFL fuzzer
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mkdir -p input_corpus output
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echo "seed" > input_corpus/seed
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afl-fuzz -i input_corpus -o output -- _build/afl/fuzz/fuzz_mylib.exe @@
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```
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## Test Structure
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### Basic Test Pattern
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```ocaml
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open Crowbar
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(* Property: operation shouldn't crash on arbitrary input *)
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let () =
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add_test ~name:"mylib_no_crash" [ bytes ] @@ fun input ->
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match MyLib.parse input with
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| Ok _ | Error _ -> check true
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(* Property: roundtrip encode/decode *)
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let () =
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add_test ~name:"mylib_roundtrip" [ int ] @@ fun n ->
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let encoded = MyLib.encode n in
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match MyLib.decode encoded with
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| Error e -> failwith ("roundtrip failed: " ^ e)
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| Ok decoded -> check (decoded = n)
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```
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### Crowbar Generators
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Crowbar provides generators for creating test inputs:
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```ocaml
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open Crowbar
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(* Primitive generators *)
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let _ = bool (* bool *)
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let _ = int (* int (small range in quickcheck mode) *)
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let _ = int8 (* 0-255 *)
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let _ = int32 (* int32 *)
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let _ = int64 (* int64 *)
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let _ = float (* float *)
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let _ = bytes (* arbitrary byte string *)
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let _ = bytes_fixed 10 (* exactly 10 bytes *)
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(* Range generator *)
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let _ = range 100 (* 0 to 99 *)
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(* Choice from constants *)
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let _ = choose [
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const "hello";
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const "world";
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const "";
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]
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(* Mapping over generators *)
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let positive_int = map [int] (fun n -> abs n)
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(* Optional values *)
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let maybe_int = option int (* int option *)
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(* Lists *)
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let int_list = list int (* int list *)
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(* Pairs and tuples *)
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let pair = pair int bytes (* int * bytes *)
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```
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### Common Test Patterns
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#### 1. Crash Resistance (Robustness)
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Test that arbitrary input doesn't cause crashes:
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```ocaml
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let () =
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add_test ~name:"parser_no_crash" [ bytes ] @@ fun input ->
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(* Should never raise an exception *)
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let _ = try Parser.parse input with _ -> [] in
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check true
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```
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#### 2. Roundtrip Property
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Test encode/decode symmetry:
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```ocaml
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let () =
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add_test ~name:"codec_roundtrip" [ int ] @@ fun value ->
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match encode value with
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| Error e -> failwith ("encode failed: " ^ e)
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| Ok encoded ->
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match decode encoded with
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| Error e -> failwith ("decode failed: " ^ e)
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| Ok decoded -> check (decoded = value)
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```
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#### 3. Idempotence
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Test that applying operation twice equals applying once:
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```ocaml
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let () =
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add_test ~name:"normalize_idempotent" [ bytes ] @@ fun input ->
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let once = normalize input in
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let twice = normalize once in
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check (once = twice)
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```
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#### 4. Known Edge Cases
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Test specific problematic inputs:
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```ocaml
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let () =
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add_test ~name:"empty_input" [ const () ] @@ fun () ->
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match parse "" with
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| Ok _ | Error _ -> check true
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let () =
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add_test ~name:"boundary_values"
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[ choose [
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const 0;
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const (-1);
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const max_int;
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const min_int;
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] ]
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@@ fun n ->
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match process n with
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| Ok _ | Error _ -> check true
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```
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#### 5. Type Mismatch Handling
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Test graceful handling of wrong types:
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```ocaml
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let () =
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add_test ~name:"type_mismatch" [ bytes ] @@ fun input ->
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(* Parsing arbitrary bytes as int should fail gracefully *)
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match decode_int input with
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| Ok _ -> check true (* unexpected success is fine *)
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| Error _ -> check true (* expected failure *)
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```
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#### 6. Comparison with Reference Implementation
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```ocaml
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let () =
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add_test ~name:"matches_reference" [ int; int ] @@ fun a b ->
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let result = MyLib.add a b in
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let expected = a + b in
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check (result = expected)
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```
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### Handling Expected Failures
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When some inputs are expected to fail:
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```ocaml
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(* Large integers may exceed safe precision *)
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let max_safe_int = 9007199254740991
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let () =
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add_test ~name:"large_int_handling" [ range max_int ] @@ fun n ->
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match encode n with
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| Error _ ->
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(* Large ints beyond safe precision correctly rejected *)
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check (n > max_safe_int)
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| Ok encoded ->
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match decode encoded with
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| Error _ -> check (n > max_safe_int)
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| Ok decoded -> check (decoded = n)
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```
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### Float Comparison
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Use epsilon comparison for floating-point roundtrips:
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```ocaml
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let () =
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add_test ~name:"float_roundtrip"
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[ choose [ const 0.0; const 3.14; const (-2.5) ] ]
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@@ fun f ->
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match encode f |> Result.bind decode with
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| Error e -> failwith e
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| Ok decoded ->
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(* Use epsilon comparison for floats *)
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check (Float.abs (decoded -. f) < 0.0001)
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```
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## AFL Fuzzing Setup
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### Prerequisites
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- OCaml compiler with AFL support
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- AFL or AFL++ installed
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- Dune 3.0+
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### Dune Workspace Configuration
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Create or update `dune-workspace` at project root:
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```lisp
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(lang dune 3.20)
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(context default)
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(context
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(default
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(name afl)
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(profile afl)))
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(env
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(afl
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(ocamlopt_flags (:standard -afl-instrument))))
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```
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This creates an `afl` build context that instruments binaries for coverage-guided fuzzing.
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### Building for AFL
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```bash
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dune build --context afl
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```
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Instrumented binaries are output to `_build/afl/`.
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### Running AFL
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```bash
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# Create input corpus with seed files
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mkdir -p input_corpus
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echo '{"key": "value"}' > input_corpus/json1
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echo 'key: value' > input_corpus/yaml1
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# Run AFL fuzzer
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afl-fuzz -i input_corpus -o findings -- _build/afl/fuzz/fuzz_mylib.exe @@
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```
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### Common AFL Issues
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#### Core Pattern Error
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```
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AFL: Oops, your system is configured to send core dump notifications to an external utility...
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```
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**Fix:**
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```bash
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sudo su -c 'echo core > /proc/sys/kernel/core_pattern'
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```
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#### CPU Scaling Error
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```
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AFL: The CPU frequency scaling governor is set to "powersave"...
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```
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**Fix:**
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```bash
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sudo cpufreq-set -g performance
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# Or use AFL_SKIP_CPUFREQ=1 to ignore (not recommended)
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```
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## Complete Example
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Here's a complete fuzz test file for a YAML library:
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```ocaml
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(** Property-based tests for MyYaml using Crowbar *)
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open Crowbar
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(* Helper functions *)
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let decode codec s =
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let reader = Bytesrw.Bytes.Reader.of_string s in
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MyYaml.decode codec reader
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let encode codec v =
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let buf = Buffer.create 256 in
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let writer = Bytesrw.Bytes.Writer.of_buffer buf in
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match MyYaml.encode codec v writer with
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| Ok () -> Ok (Buffer.contents buf)
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| Error e -> Error e
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(* Test: Arbitrary input shouldn't crash *)
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let () =
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add_test ~name:"yaml_no_crash" [ bytes ] @@ fun input ->
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match decode Codec.string input with
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| Ok _ | Error _ -> check true
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(* Test: String roundtrip *)
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let () =
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add_test ~name:"yaml_string_roundtrip"
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[ choose [ const "hello"; const ""; const "with\nnewline" ] ]
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@@ fun s ->
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match encode Codec.string s with
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| Error e -> failwith ("encode: " ^ e)
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| Ok yaml ->
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match decode Codec.string yaml with
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| Error e -> failwith ("decode: " ^ e)
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| Ok decoded -> check (decoded = s)
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(* Test: Int roundtrip *)
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let () =
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add_test ~name:"yaml_int_roundtrip" [ range 1000000 ] @@ fun n ->
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match encode Codec.int n with
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| Error e -> failwith ("encode: " ^ e)
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| Ok yaml ->
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match decode Codec.int yaml with
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| Error e -> failwith ("decode: " ^ e)
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| Ok decoded -> check (decoded = n)
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(* Test: Bool roundtrip *)
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let () =
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add_test ~name:"yaml_bool_roundtrip" [ bool ] @@ fun b ->
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match encode Codec.bool b with
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| Error e -> failwith ("encode: " ^ e)
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| Ok yaml ->
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match decode Codec.bool yaml with
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| Error e -> failwith ("decode: " ^ e)
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| Ok decoded -> check (decoded = b)
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(* Test: List roundtrip *)
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let () =
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add_test ~name:"yaml_list_roundtrip"
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[ choose [ const []; const [1;2;3]; const [0] ] ]
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@@ fun lst ->
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let codec = Codec.list Codec.int in
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match encode codec lst with
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| Error e -> failwith ("encode: " ^ e)
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| Ok yaml ->
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match decode codec yaml with
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| Error e -> failwith ("decode: " ^ e)
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| Ok decoded -> check (decoded = lst)
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(* Test: Empty input *)
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let () =
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add_test ~name:"yaml_empty" [ const () ] @@ fun () ->
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match decode Codec.string "" with
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| Ok _ | Error _ -> check true
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(* Test: Nested structures *)
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let () =
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add_test ~name:"yaml_nested"
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[ choose [ const [[]]; const [[1;2];[3;4]] ] ]
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@@ fun nested ->
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let codec = Codec.list (Codec.list Codec.int) in
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match encode codec nested with
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| Error e -> failwith ("encode: " ^ e)
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| Ok yaml ->
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match decode codec yaml with
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| Error e -> failwith ("decode: " ^ e)
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| Ok decoded -> check (decoded = nested)
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```
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## Tips for Writing Effective Fuzz Tests
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1. **Start with crash resistance** - The most basic test ensures arbitrary input doesn't crash your code.
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2. **Test roundtrips** - If you have encode/decode pairs, roundtrip tests catch many bugs.
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3. **Use `choose` for edge cases** - Combine random generation with known problematic values.
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4. **Keep generators focused** - Generate only valid inputs for properties that require them.
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5. **Handle expected failures gracefully** - Use pattern matching to distinguish expected vs unexpected failures.
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6. **Test at boundaries** - Empty inputs, maximum values, and type boundaries often reveal bugs.
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7. **Run QuickCheck mode in CI** - It's fast and catches many issues without AFL setup.
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8. **Use AFL for deep testing** - AFL's coverage guidance finds edge cases that random testing misses.
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## Bugs Found by This Approach
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Example bugs discovered through fuzz testing:
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- **Empty string encoding** - Empty strings weren't properly quoted, causing decode failures
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- **Empty array encoding** - Empty arrays `[]` weren't using flow style, breaking roundtrips
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- **Large integer precision** - Integers > 2^53-1 lost precision in float-based formats
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- **Option type decoding** - Nested type combinators weren't being unwrapped during scalar decoding
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- **Special character handling** - Strings with newlines or special YAML characters needed escaping
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### HTML Parser Bugs (html5rw)
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Fuzz testing html5rw discovered these serialization bugs:
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- **Raw text element double-escaping** - Elements like `<script>`, `<style>`, `<xmp>`, `<iframe>`, `<noembed>`, `<noframes>`, `<noscript>` were having their content HTML-escaped during serialization, which broke roundtrips (e.g., `<` becoming `<` inside script tags)
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- **Escapable raw text handling** - Elements `<textarea>` and `<title>` need special treatment: only `&` needs escaping, not `<` or `>`
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- **Plaintext element serialization** - The `<plaintext>` element cannot be closed in HTML5, so serialization must stop after emitting its content
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## AFL++ Compatibility Notes
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When using AFL++ (modern fork of AFL) with OCaml:
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### Crowbar Persistent Mode Issues
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Crowbar's built-in AFL support may not work with AFL++. The `@@` file-based mode with Crowbar often results in "No instrumentation detected" errors even when instrumentation is present.
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**Solution**: Create a separate AFL fuzzer using `afl-persistent` directly:
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```ocaml
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(* fuzz_afl.ml - Simple AFL-compatible fuzzer *)
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let fuzz_input input =
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try
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(* Your fuzzing logic here *)
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let result = MyLib.parse input in
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let serialized = MyLib.serialize result in
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(* Check properties, assert on failures *)
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if not (some_property serialized) then
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assert false;
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true
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with
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| Assert_failure _ -> raise (Assert_failure ("", 0, 0))
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| _ -> true (* Expected failures for malformed input *)
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+
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let read_file filename =
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let ic = open_in_bin filename in
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let n = in_channel_length ic in
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let s = really_input_string ic n in
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close_in ic;
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s
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+
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let () =
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AflPersistent.run (fun () ->
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if Array.length Sys.argv < 2 then begin
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Printf.eprintf "Usage: %s <input_file>\n" Sys.argv.(0);
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exit 1
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end;
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let input = read_file Sys.argv.(1) in
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ignore (fuzz_input input)
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)
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```
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Add `afl-persistent` to dependencies in dune:
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+
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```lisp
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(executable
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(name fuzz_afl)
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(libraries mylib afl-persistent))
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```
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### Building with AFL Instrumentation
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+
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Use `-x afl` flag (not `--context afl`):
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+
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```bash
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dune build -x afl ./fuzz/fuzz_afl.exe
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```
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+
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### Environment Variables for AFL++
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+
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+
```bash
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# Suppress core_pattern warning (when you can't modify /proc/sys/kernel/core_pattern)
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export AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES=1
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+
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# Skip CPU frequency scaling check
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export AFL_SKIP_CPUFREQ=1
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+
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# Run AFL
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afl-fuzz -i input_corpus -o output -- _build/afl/fuzz/fuzz_afl.exe @@
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```
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+
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### Verifying Instrumentation
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+
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Use `afl-showmap` to verify instrumentation is detected:
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```bash
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afl-showmap -o /tmp/map -- _build/afl/fuzz/fuzz_afl.exe /tmp/test_input
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cat /tmp/map | head -20 # Should show tuples like "000062:3"
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```
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A healthy instrumentation should capture 200+ tuples for a non-trivial program.
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## Creating Effective Seed Corpus
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+
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For HTML parsers, include diverse constructs:
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```bash
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mkdir -p fuzz/input_corpus
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+
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# Basic structure
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echo '<html><head><title>Test</title></head><body><p>Hello</p></body></html>' > fuzz/input_corpus/basic.html
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+
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# Raw text elements (critical for escaping bugs)
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echo '<script>if (a < b && c > d) {}</script>' > fuzz/input_corpus/script.html
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echo '<style>.foo { content: "<bar>" }</style>' > fuzz/input_corpus/style.html
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+
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# Escapable raw text elements
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echo '<textarea>Text with <html> tags & entities</textarea>' > fuzz/input_corpus/textarea.html
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+
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# Tables (complex nesting rules)
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echo '<table><tr><td>Cell</td></tr></table>' > fuzz/input_corpus/table.html
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+
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# Forms
567
+
echo '<form><input type="text"><button>Submit</button></form>' > fuzz/input_corpus/form.html
568
+
569
+
# SVG/MathML (foreign content)
570
+
echo '<svg><circle r="50"/></svg>' > fuzz/input_corpus/svg.html
571
+
echo '<math><mrow><mi>x</mi></mrow></math>' > fuzz/input_corpus/math.html
572
+
573
+
# Entities
574
+
echo '<p>& < > </p>' > fuzz/input_corpus/entities.html
575
+
576
+
# Template elements
577
+
echo '<template><div>Content</div></template>' > fuzz/input_corpus/template.html
578
+
579
+
# Malformed HTML (parser recovery)
580
+
echo '<p>Unclosed<div>Mixed</p></div>' > fuzz/input_corpus/malformed.html
581
+
582
+
# Comments
583
+
echo '<!--comment-->Text<!---->More' > fuzz/input_corpus/comment.html
584
+
```
585
+
586
+
## Recommended Test Properties for Parsers
587
+
588
+
### 1. Roundtrip Stabilization
589
+
590
+
The most effective parser test: parse โ serialize โ parse โ serialize should produce identical output on the second iteration:
591
+
592
+
```ocaml
593
+
let () =
594
+
add_test ~name:"roundtrip_stabilizes" [ bytes ] @@ fun input ->
595
+
let r1 = parse input in
596
+
let s1 = serialize r1 in
597
+
let r2 = parse s1 in
598
+
let s2 = serialize r2 in
599
+
let r3 = parse s2 in
600
+
let s3 = serialize r3 in
601
+
(* First roundtrip may differ, but second must stabilize *)
602
+
check (s2 = s3)
603
+
```
604
+
605
+
### 2. Clone Consistency
606
+
607
+
For DOM-like structures with clone operations:
608
+
609
+
```ocaml
610
+
let () =
611
+
add_test ~name:"clone_identical" [ bytes ] @@ fun input ->
612
+
let doc = parse input in
613
+
let root = get_root doc in
614
+
let cloned = clone ~deep:true root in
615
+
check (to_html root = to_html cloned)
616
+
```
617
+
618
+
### 3. Error Consistency
619
+
620
+
Parse errors should be deterministic:
621
+
622
+
```ocaml
623
+
let () =
624
+
add_test ~name:"errors_consistent" [ bytes ] @@ fun input ->
625
+
let r1 = parse input in
626
+
let r2 = parse input in
627
+
check (get_errors r1 = get_errors r2)
628
+
```
629
+
630
+
## Workflow for Fuzz-Driven Bug Fixing
631
+
632
+
1. **Run QuickCheck mode first** - Fast iteration, catches obvious bugs
633
+
```bash
634
+
dune exec ./fuzz/fuzz_mylib.exe
635
+
```
636
+
637
+
2. **Fix bugs, re-run** - Iterate until QuickCheck passes
638
+
639
+
3. **Run AFL for deeper coverage** - 5-10 minutes initially
640
+
```bash
641
+
dune build -x afl ./fuzz/fuzz_afl.exe
642
+
AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES=1 AFL_SKIP_CPUFREQ=1 \
643
+
timeout 600 afl-fuzz -i fuzz/input_corpus -o fuzz/output -- \
644
+
_build/afl/fuzz/fuzz_afl.exe @@
645
+
```
646
+
647
+
4. **Check for crashes** - Examine `fuzz/output/default/crashes/`
648
+
```bash
649
+
ls fuzz/output/default/crashes/
650
+
# Reproduce crash:
651
+
_build/afl/fuzz/fuzz_afl.exe fuzz/output/default/crashes/id:000000,...
652
+
```
653
+
654
+
5. **Fix and repeat** - Continue until no crashes found after extended runs
655
+
656
+
6. **Measure coverage** - Track corpus growth and edge coverage
657
+
```bash
658
+
cat fuzz/output/default/fuzzer_stats | grep -E "(execs_done|corpus_count|saved_crashes)"
659
+
```
+1
-1
bin/dune
+1
-1
bin/dune
+20
-2
dune-project
+20
-2
dune-project
···
1
-
(lang dune 3.21)
1
+
(lang dune 3.20)
2
+
2
3
(name html5rw)
3
4
4
5
(generate_opam_files true)
5
6
6
7
(license MIT)
7
8
(authors "Anil Madhavapeddy <anil@recoil.org>")
9
+
(homepage "https://tangled.org/@anil.recoil.org/ocaml-html5rw")
8
10
(maintainers "Anil Madhavapeddy <anil@recoil.org>")
9
-
(source (tangled anil.recoil.org/ocaml-html5rw))
11
+
(bug_reports "https://tangled.org/@anil.recoil.org/ocaml-html5rw/issues")
12
+
(maintenance_intent "(latest)")
10
13
11
14
(package
12
15
(name html5rw)
···
28
31
(jsont (>= 0.2.0))
29
32
(cmdliner (>= 1.3.0))))
30
33
34
+
(package
35
+
(name html5rw-js)
36
+
(allow_empty)
37
+
(synopsis "Browser-based HTML5 parser via js_of_ocaml/wasm_of_ocaml")
38
+
(description
39
+
"JavaScript and WebAssembly builds of the html5rw HTML5 parser for browser use. \
40
+
Includes a main validator library, web worker for background validation, and \
41
+
browser-based test runner.")
42
+
(depends
43
+
(ocaml (>= 5.1.0))
44
+
(html5rw (= :version))
45
+
(js_of_ocaml (>= 5.0))
46
+
(js_of_ocaml-ppx (>= 5.0))
47
+
(wasm_of_ocaml-compiler (>= 5.0))
48
+
(brr (>= 0.0.6))))
+12
dune-workspace
+12
dune-workspace
+8
-8
examples/dune
+8
-8
examples/dune
···
1
1
(executable
2
2
(name basic_parsing)
3
3
(modules basic_parsing)
4
-
(libraries bytesrw html5rw unix))
4
+
(libraries bytesrw html5rw))
5
5
6
6
(executable
7
7
(name css_selectors)
8
8
(modules css_selectors)
9
-
(libraries bytesrw html5rw unix))
9
+
(libraries bytesrw html5rw))
10
10
11
11
(executable
12
12
(name dom_manipulation)
13
13
(modules dom_manipulation)
14
-
(libraries bytesrw html5rw unix))
14
+
(libraries bytesrw html5rw))
15
15
16
16
(executable
17
17
(name text_extraction)
18
18
(modules text_extraction)
19
-
(libraries bytesrw html5rw unix))
19
+
(libraries bytesrw html5rw))
20
20
21
21
(executable
22
22
(name error_handling)
23
23
(modules error_handling)
24
-
(libraries bytesrw html5rw unix))
24
+
(libraries bytesrw html5rw))
25
25
26
26
(executable
27
27
(name fragment_parsing)
28
28
(modules fragment_parsing)
29
-
(libraries bytesrw html5rw unix))
29
+
(libraries bytesrw html5rw))
30
30
31
31
(executable
32
32
(name encoding_detection)
33
33
(modules encoding_detection)
34
-
(libraries bytesrw html5rw unix))
34
+
(libraries bytesrw html5rw))
35
35
36
36
(executable
37
37
(name web_scraper)
38
38
(modules web_scraper)
39
-
(libraries bytesrw html5rw unix))
39
+
(libraries bytesrw html5rw))
+55
fuzz/dune
+55
fuzz/dune
···
1
+
(executable
2
+
(name fuzz_html5rw)
3
+
(libraries bytesrw html5rw crowbar))
4
+
5
+
(executable
6
+
(name fuzz_afl)
7
+
(libraries bytesrw html5rw afl-persistent))
8
+
9
+
(executable (name test_crash) (libraries bytesrw html5rw))
10
+
(executable (name test_pre) (libraries bytesrw html5rw))
11
+
12
+
; Property-based testing (AFL)
13
+
(executable
14
+
(name fuzz_properties)
15
+
(libraries bytesrw html5rw str afl-persistent))
16
+
17
+
; Structure-aware fuzzer (AFL)
18
+
(executable
19
+
(name fuzz_structure)
20
+
(libraries bytesrw html5rw str))
21
+
22
+
; Resource exhaustion tests
23
+
(executable
24
+
(name fuzz_exhaustion)
25
+
(libraries bytesrw html5rw unix))
26
+
27
+
; Error recovery tests
28
+
(executable
29
+
(name fuzz_error_recovery)
30
+
(libraries bytesrw html5rw))
31
+
32
+
; Serializer-specific tests
33
+
(executable
34
+
(name fuzz_serializer)
35
+
(libraries bytesrw html5rw str))
36
+
37
+
; Streaming/incremental tests
38
+
(executable
39
+
(name fuzz_streaming)
40
+
(libraries bytesrw html5rw))
41
+
42
+
; Encoding tests
43
+
(executable
44
+
(name fuzz_encoding)
45
+
(libraries bytesrw html5rw))
46
+
47
+
; Fragment parsing tests
48
+
(executable
49
+
(name fuzz_fragment)
50
+
(libraries bytesrw html5rw))
51
+
52
+
; Security/sanitizer tests
53
+
(executable
54
+
(name fuzz_security)
55
+
(libraries bytesrw html5rw str))
+92
fuzz/fuzz_afl.ml
+92
fuzz/fuzz_afl.ml
···
1
+
(** Simple AFL-compatible fuzzer for html5rw
2
+
3
+
This fuzzer reads input from a file (passed as command line argument)
4
+
and runs several property tests on it. It uses AflPersistent for
5
+
efficient AFL fuzzing.
6
+
*)
7
+
8
+
(* Helper to create a bytes reader from a string *)
9
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
10
+
11
+
(* Serialize a parse result to string *)
12
+
let serialize result =
13
+
Html5rw.to_string ~pretty:false result
14
+
15
+
(* Main fuzzing function - returns true if test passes *)
16
+
let fuzz_input input =
17
+
try
18
+
(* Test 1: Parse should not crash *)
19
+
let result = Html5rw.parse (reader_of_string input) in
20
+
21
+
(* Test 2: Serialization should not crash *)
22
+
let serialized = serialize result in
23
+
24
+
(* Test 3: Reparse should not crash *)
25
+
let result2 = Html5rw.parse (reader_of_string serialized) in
26
+
let serialized2 = serialize result2 in
27
+
28
+
(* Test 4: Roundtrip should stabilize (s2 == s3) *)
29
+
let result3 = Html5rw.parse (reader_of_string serialized2) in
30
+
let serialized3 = serialize result3 in
31
+
32
+
if serialized2 <> serialized3 then begin
33
+
Printf.eprintf "ROUNDTRIP BUG:\n";
34
+
Printf.eprintf "Input: %s\n" (String.escaped (String.sub input 0 (min 100 (String.length input))));
35
+
Printf.eprintf "s2: %s\n" (String.escaped (String.sub serialized2 0 (min 100 (String.length serialized2))));
36
+
Printf.eprintf "s3: %s\n" (String.escaped (String.sub serialized3 0 (min 100 (String.length serialized3))));
37
+
(* Signal a bug to AFL by aborting *)
38
+
assert false
39
+
end;
40
+
41
+
(* Test 5: Text extraction should not crash *)
42
+
let _ = Html5rw.to_text result in
43
+
44
+
(* Test 6: Clone should produce identical output *)
45
+
let root = Html5rw.root result in
46
+
let cloned = Html5rw.clone ~deep:true root in
47
+
let original_html = Html5rw.Dom.to_html ~pretty:false root in
48
+
let cloned_html = Html5rw.Dom.to_html ~pretty:false cloned in
49
+
50
+
if original_html <> cloned_html then begin
51
+
Printf.eprintf "CLONE BUG:\n";
52
+
Printf.eprintf "Original: %s\n" (String.escaped (String.sub original_html 0 (min 100 (String.length original_html))));
53
+
Printf.eprintf "Cloned: %s\n" (String.escaped (String.sub cloned_html 0 (min 100 (String.length cloned_html))));
54
+
assert false
55
+
end;
56
+
57
+
(* Test 7: Selector queries should not crash (test a few common patterns) *)
58
+
let selectors = ["*"; "div"; ".class"; "#id"; "div > p"; "[attr]"] in
59
+
List.iter (fun sel ->
60
+
try
61
+
let _ = Html5rw.query result sel in ()
62
+
with Html5rw.Selector.Selector_error _ -> ()
63
+
) selectors;
64
+
65
+
true
66
+
with
67
+
| Assert_failure _ ->
68
+
(* Re-raise assert failures so AFL sees the crash *)
69
+
raise (Assert_failure ("", 0, 0))
70
+
| _ ->
71
+
(* Other exceptions are expected for malformed input *)
72
+
true
73
+
74
+
(* Read file contents *)
75
+
let read_file filename =
76
+
let ic = open_in_bin filename in
77
+
let n = in_channel_length ic in
78
+
let s = really_input_string ic n in
79
+
close_in ic;
80
+
s
81
+
82
+
(* Main entry point *)
83
+
let () =
84
+
(* Use AflPersistent for efficient AFL fuzzing *)
85
+
AflPersistent.run (fun () ->
86
+
if Array.length Sys.argv < 2 then begin
87
+
Printf.eprintf "Usage: %s <input_file>\n" Sys.argv.(0);
88
+
exit 1
89
+
end;
90
+
let input = read_file Sys.argv.(1) in
91
+
ignore (fuzz_input input)
92
+
)
+260
fuzz/fuzz_encoding.ml
+260
fuzz/fuzz_encoding.ml
···
1
+
(* Encoding fuzzer for HTML5rw
2
+
Tests UTF-8 handling, BOM, surrogates, and encoding edge cases *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Test helper: parse and serialize, check for crashes *)
7
+
let test_encoding input =
8
+
try
9
+
let r = Html5rw.parse (reader_of_string input) in
10
+
let _ = Html5rw.to_string ~pretty:false r in
11
+
true
12
+
with _ ->
13
+
false
14
+
15
+
(* Test helper: check roundtrip stability *)
16
+
let test_roundtrip input =
17
+
try
18
+
let r1 = Html5rw.parse (reader_of_string input) in
19
+
let s1 = Html5rw.to_string ~pretty:false r1 in
20
+
let r2 = Html5rw.parse (reader_of_string s1) in
21
+
let s2 = Html5rw.to_string ~pretty:false r2 in
22
+
let r3 = Html5rw.parse (reader_of_string s2) in
23
+
let s3 = Html5rw.to_string ~pretty:false r3 in
24
+
s2 = s3
25
+
with _ -> false
26
+
27
+
(* UTF-8 BOM *)
28
+
let bom_cases = [|
29
+
"\xEF\xBB\xBF"; (* Just BOM *)
30
+
"\xEF\xBB\xBF<!DOCTYPE html>"; (* BOM + DOCTYPE *)
31
+
"\xEF\xBB\xBF<div>test</div>"; (* BOM + content *)
32
+
"\xEF\xBB\xBF\xEF\xBB\xBF"; (* Double BOM *)
33
+
"<div>\xEF\xBB\xBF</div>"; (* BOM in content - should be preserved as text *)
34
+
|]
35
+
36
+
(* Valid UTF-8 sequences *)
37
+
let valid_utf8_cases = [|
38
+
(* 1-byte (ASCII) *)
39
+
"hello";
40
+
"<div>test</div>";
41
+
42
+
(* 2-byte sequences *)
43
+
"\xC2\xA0"; (* NBSP *)
44
+
"\xC3\xA9"; (* รฉ *)
45
+
"caf\xC3\xA9"; (* cafรฉ *)
46
+
"\xC2\xAB\xC2\xBB"; (* ยซ ยป *)
47
+
48
+
(* 3-byte sequences *)
49
+
"\xE2\x80\x93"; (* en-dash *)
50
+
"\xE2\x80\x94"; (* em-dash *)
51
+
"\xE2\x80\x99"; (* right single quote *)
52
+
"\xE2\x80\x9C\xE2\x80\x9D"; (* curly quotes *)
53
+
"\xE4\xB8\xAD\xE6\x96\x87"; (* ไธญๆ *)
54
+
"\xE6\x97\xA5\xE6\x9C\xAC\xE8\xAA\x9E"; (* ๆฅๆฌ่ช *)
55
+
56
+
(* 4-byte sequences (emoji, etc.) *)
57
+
"\xF0\x9F\x98\x80"; (* ๐ *)
58
+
"\xF0\x9F\x8E\x89"; (* ๐ *)
59
+
"\xF0\x9D\x94\xB8"; (* ๐ธ mathematical double-struck *)
60
+
61
+
(* Mixed *)
62
+
"<div>\xC3\xA9\xE2\x80\x93\xF0\x9F\x98\x80</div>";
63
+
"<span title=\"\xC3\xA9\">text</span>";
64
+
|]
65
+
66
+
(* Invalid UTF-8 sequences (should be handled gracefully) *)
67
+
let invalid_utf8_cases = [|
68
+
(* Lone continuation bytes *)
69
+
"\x80";
70
+
"\xBF";
71
+
"\x80\x80\x80";
72
+
73
+
(* Overlong sequences *)
74
+
"\xC0\x80"; (* Overlong NUL *)
75
+
"\xE0\x80\x80"; (* Overlong NUL (3-byte) *)
76
+
"\xF0\x80\x80\x80"; (* Overlong NUL (4-byte) *)
77
+
"\xC0\xAF"; (* Overlong / *)
78
+
"\xC1\xBF"; (* Overlong DEL *)
79
+
80
+
(* Truncated sequences *)
81
+
"\xC2"; (* Start of 2-byte, missing continuation *)
82
+
"\xE0\x80"; (* Start of 3-byte, missing continuation *)
83
+
"\xF0\x80\x80"; (* Start of 4-byte, missing continuation *)
84
+
85
+
(* Invalid start bytes *)
86
+
"\xFE";
87
+
"\xFF";
88
+
"\xFE\xFF"; (* UTF-16 BE BOM as bytes *)
89
+
"\xFF\xFE"; (* UTF-16 LE BOM as bytes *)
90
+
91
+
(* Surrogate pairs (invalid in UTF-8) *)
92
+
"\xED\xA0\x80"; (* High surrogate U+D800 *)
93
+
"\xED\xBF\xBF"; (* Low surrogate U+DFFF *)
94
+
"\xED\xA0\x80\xED\xB0\x80"; (* Surrogate pair (should be single 4-byte) *)
95
+
96
+
(* Out of range *)
97
+
"\xF4\x90\x80\x80"; (* U+110000, beyond Unicode *)
98
+
"\xF7\xBF\xBF\xBF"; (* U+1FFFFF, way beyond *)
99
+
100
+
(* Invalid sequence in tag *)
101
+
"<div\x80>";
102
+
"<div class=\"\x80\">";
103
+
"</\x80div>";
104
+
105
+
(* Invalid in attribute value *)
106
+
"<div data-x=\"\xC0\xAF\">";
107
+
"<div title=\"\xED\xA0\x80\">";
108
+
|]
109
+
110
+
(* Control characters *)
111
+
let control_char_cases = [|
112
+
(* NUL *)
113
+
"\x00";
114
+
"<div>\x00</div>";
115
+
"<div attr=\"\x00\">";
116
+
117
+
(* Other C0 controls *)
118
+
"\x01\x02\x03";
119
+
"<div>\x08</div>"; (* backspace *)
120
+
"<div>\x0B</div>"; (* vertical tab *)
121
+
"<div>\x0C</div>"; (* form feed *)
122
+
123
+
(* C1 controls (as UTF-8) *)
124
+
"\xC2\x80"; (* U+0080 *)
125
+
"\xC2\x9F"; (* U+009F *)
126
+
127
+
(* DEL *)
128
+
"\x7F";
129
+
130
+
(* Mixed with valid content *)
131
+
"<div>hello\x00world</div>";
132
+
"<div>test\x01\x02\x03</div>";
133
+
|]
134
+
135
+
(* Unicode special characters *)
136
+
let special_unicode_cases = [|
137
+
(* Zero-width characters *)
138
+
"\xE2\x80\x8B"; (* ZWSP U+200B *)
139
+
"\xE2\x80\x8C"; (* ZWNJ U+200C *)
140
+
"\xE2\x80\x8D"; (* ZWJ U+200D *)
141
+
"\xEF\xBB\xBF"; (* BOM/ZWNBSP U+FEFF *)
142
+
143
+
(* Replacement character *)
144
+
"\xEF\xBF\xBD"; (* U+FFFD *)
145
+
146
+
(* Byte order marks and special noncharacters *)
147
+
"\xEF\xBF\xBE"; (* U+FFFE - noncharacter *)
148
+
"\xEF\xBF\xBF"; (* U+FFFF - noncharacter *)
149
+
150
+
(* Private use area *)
151
+
"\xEE\x80\x80"; (* U+E000 *)
152
+
"\xEF\xA3\xBF"; (* U+F8FF *)
153
+
154
+
(* RTL and BiDi *)
155
+
"\xE2\x80\x8F"; (* RLM U+200F *)
156
+
"\xE2\x80\xAE"; (* RLO U+202E *)
157
+
"\xE2\x80\xAC"; (* PDF U+202C *)
158
+
159
+
(* Combining characters *)
160
+
"e\xCC\x81"; (* e + combining acute = รฉ *)
161
+
"a\xCC\x80\xCC\x81\xCC\x82"; (* Multiple combining marks *)
162
+
163
+
(* In HTML context *)
164
+
"<div>\xE2\x80\x8B</div>";
165
+
"<span title=\"\xE2\x80\x8F\">";
166
+
|]
167
+
168
+
(* Numeric character references *)
169
+
let ncr_cases = [|
170
+
(* Valid decimal *)
171
+
"A"; (* A *)
172
+
"©"; (* ยฉ *)
173
+
"—"; (* em-dash *)
174
+
"😀"; (* ๐ *)
175
+
176
+
(* Valid hex *)
177
+
"A";
178
+
"©";
179
+
"—";
180
+
"😀";
181
+
182
+
(* Edge cases *)
183
+
"�"; (* NUL - should become replacement *)
184
+
"�";
185
+
""; (* DEL *)
186
+
"€"; (* C1 control *)
187
+
"Ÿ"; (* Last C1 control *)
188
+
189
+
(* Surrogates (should be replaced) *)
190
+
"�";
191
+
"�";
192
+
"�"; (* D800 decimal *)
193
+
194
+
(* Noncharacters *)
195
+
"";
196
+
"";
197
+
"";
198
+
199
+
(* Beyond Unicode *)
200
+
"�";
201
+
"�";
202
+
203
+
(* Very large numbers *)
204
+
"�";
205
+
"�";
206
+
207
+
(* Invalid formats *)
208
+
"&#;";
209
+
"&#x;";
210
+
"&#xGHI;";
211
+
"&#abc;";
212
+
|]
213
+
214
+
let run_test_category name cases test_fn =
215
+
let passed = ref 0 in
216
+
let failed = ref 0 in
217
+
Array.iter (fun input ->
218
+
if test_fn input then
219
+
incr passed
220
+
else begin
221
+
Printf.printf " FAIL: %s\n"
222
+
(String.escaped (String.sub input 0 (min 40 (String.length input))));
223
+
incr failed
224
+
end
225
+
) cases;
226
+
Printf.printf "%s: %d/%d\n" name !passed (Array.length cases);
227
+
!failed = 0
228
+
229
+
let () =
230
+
Printf.printf "=== Encoding Tests ===\n\n";
231
+
232
+
let all_pass = ref true in
233
+
234
+
(* Test basic handling (no exceptions) *)
235
+
Printf.printf "--- Crash resistance tests ---\n";
236
+
if not (run_test_category "BOM handling" bom_cases test_encoding) then
237
+
all_pass := false;
238
+
if not (run_test_category "Valid UTF-8" valid_utf8_cases test_encoding) then
239
+
all_pass := false;
240
+
if not (run_test_category "Invalid UTF-8" invalid_utf8_cases test_encoding) then
241
+
all_pass := false;
242
+
if not (run_test_category "Control characters" control_char_cases test_encoding) then
243
+
all_pass := false;
244
+
if not (run_test_category "Special Unicode" special_unicode_cases test_encoding) then
245
+
all_pass := false;
246
+
if not (run_test_category "Numeric character refs" ncr_cases test_encoding) then
247
+
all_pass := false;
248
+
249
+
(* Test roundtrip stability for valid cases *)
250
+
Printf.printf "\n--- Roundtrip stability tests ---\n";
251
+
if not (run_test_category "Valid UTF-8 roundtrip" valid_utf8_cases test_roundtrip) then
252
+
all_pass := false;
253
+
254
+
Printf.printf "\n=== Summary ===\n";
255
+
if !all_pass then
256
+
Printf.printf "All encoding tests passed!\n"
257
+
else begin
258
+
Printf.printf "Some encoding tests failed!\n";
259
+
exit 1
260
+
end
+224
fuzz/fuzz_error_recovery.ml
+224
fuzz/fuzz_error_recovery.ml
···
1
+
(* Error recovery fuzzer for HTML5rw
2
+
Tests the parser's ability to handle and recover from various error conditions *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Category 1: Unclosed tags *)
7
+
let unclosed_tag_cases = [|
8
+
"<div>";
9
+
"<div><span>";
10
+
"<div><div><div>";
11
+
"<p><p><p>";
12
+
"<a href='x'><b><i>";
13
+
"<table><tr><td>";
14
+
"<ul><li><li><li>";
15
+
"<select><option><option>";
16
+
"<dl><dt><dd>";
17
+
|]
18
+
19
+
(* Category 2: Misnested tags *)
20
+
let misnested_cases = [|
21
+
"<a><b></a></b>";
22
+
"<b><i></b></i>";
23
+
"<p><div></p></div>";
24
+
"<a href='x'><div></a></div>";
25
+
"<em><strong></em></strong>";
26
+
"<b><i><u></b></i></u>";
27
+
"<table><div></table></div>";
28
+
"<span><div></span></div>";
29
+
|]
30
+
31
+
(* Category 3: Invalid tag names *)
32
+
let invalid_tag_cases = [|
33
+
"<123>";
34
+
"<!>";
35
+
"<>";
36
+
"< >";
37
+
"<\t>";
38
+
"<\n>";
39
+
"<%>";
40
+
"<&>";
41
+
"<div<>";
42
+
"<a<b>";
43
+
|]
44
+
45
+
(* Category 4: Invalid attributes *)
46
+
let invalid_attr_cases = [|
47
+
"<div =value>";
48
+
"<div 123=value>";
49
+
"<div a=b=c>";
50
+
"<div a='b\"c>";
51
+
"<div a=\"b'c>";
52
+
"<div a=<b>";
53
+
"<div a=>>";
54
+
"<div a b c>";
55
+
"<div onclick=\"<script>\">";
56
+
|]
57
+
58
+
(* Category 5: Premature EOF *)
59
+
let premature_eof_cases = [|
60
+
"<div";
61
+
"<div attr";
62
+
"<div attr=";
63
+
"<div attr='val";
64
+
"<div attr=\"val";
65
+
"<!DOCTYPE";
66
+
"<!DOCTYPE html";
67
+
"<!--";
68
+
"<!-- comment";
69
+
"<![CDATA[";
70
+
"<script>alert(";
71
+
"<style>.foo {";
72
+
|]
73
+
74
+
(* Category 6: Invalid nesting (semantic) *)
75
+
let semantic_nesting_cases = [|
76
+
"<a><a></a></a>";
77
+
"<form><form></form></form>";
78
+
"<button><button></button></button>";
79
+
"<p><p></p></p>";
80
+
"<li><li></li></li>";
81
+
"<dt><dt></dt></dt>";
82
+
"<table><table></table></table>";
83
+
"<select><select></select></select>";
84
+
|]
85
+
86
+
(* Category 7: Foreign content errors *)
87
+
let foreign_content_cases = [|
88
+
"<svg><div></svg>";
89
+
"<math><span></math>";
90
+
"<svg><foreignObject><svg></foreignObject></svg>";
91
+
"<svg><title><svg></title></svg>";
92
+
"<math><annotation-xml><math></annotation-xml></math>";
93
+
"<svg><script>x</svg>";
94
+
"<svg><style>.x{}</svg>";
95
+
|]
96
+
97
+
(* Category 8: DOCTYPE errors *)
98
+
let doctype_cases = [|
99
+
"<!DOCTYPE>";
100
+
"<!DOCTYPE html PUBLIC>";
101
+
"<!DOCTYPE html SYSTEM>";
102
+
"<!DOCTYPE html PUBLIC \"\" \"\">";
103
+
"<!doctypehtml>";
104
+
"<!DOCTYPEhtml>";
105
+
"<!doctype\nhtml>";
106
+
"<!doctype\thtml>";
107
+
"<!doctype html><!doctype html>";
108
+
|]
109
+
110
+
(* Category 9: Comment errors *)
111
+
let comment_cases = [|
112
+
"<!---->";
113
+
"<!--->";
114
+
"<!--->";
115
+
"<!--a--!>";
116
+
"<!--a--!-->";
117
+
"<!----!>";
118
+
"<!--<script>-->";
119
+
"<!--<!---->";
120
+
"<!->";
121
+
|]
122
+
123
+
(* Category 10: Entity errors *)
124
+
let entity_cases = [|
125
+
"&;";
126
+
"&xyz;";
127
+
"&";
128
+
"&#;";
129
+
"&#x;";
130
+
"&#xGHI;";
131
+
"�";
132
+
"&nosuchentity;";
133
+
"�";
134
+
"�";
135
+
|]
136
+
137
+
(* Category 11: Script/style content *)
138
+
let rawtext_cases = [|
139
+
"<script></script></script>";
140
+
"<script><!--</script>--></script>";
141
+
"<script><![CDATA[</script>]]></script>";
142
+
"<style></style></style>";
143
+
"<textarea></textarea></textarea>";
144
+
"<title></title></title>";
145
+
"<script>x</script";
146
+
"<xmp></xmp></xmp>";
147
+
|]
148
+
149
+
(* Category 12: Table structure errors *)
150
+
let table_cases = [|
151
+
"<table><div>x</div></table>";
152
+
"<table><tr></table>";
153
+
"<table><td></table>";
154
+
"<table><caption><table></caption></table>";
155
+
"<table><tbody><td></table>";
156
+
"<table><thead><th></table>";
157
+
"<table><col></table>";
158
+
"<table><tr><th><td></table>";
159
+
"<tr><td>x</td></tr>";
160
+
|]
161
+
162
+
let test_error_recovery input category =
163
+
try
164
+
let r1 = Html5rw.parse (reader_of_string input) in
165
+
let s1 = Html5rw.to_string ~pretty:false r1 in
166
+
let r2 = Html5rw.parse (reader_of_string s1) in
167
+
let s2 = Html5rw.to_string ~pretty:false r2 in
168
+
let r3 = Html5rw.parse (reader_of_string s2) in
169
+
let s3 = Html5rw.to_string ~pretty:false r3 in
170
+
if s2 <> s3 then begin
171
+
Printf.printf "ROUNDTRIP UNSTABLE [%s]:\n" category;
172
+
Printf.printf " Input: %s\n" (String.escaped input);
173
+
Printf.printf " S2: %s\n" (String.escaped (String.sub s2 0 (min 100 (String.length s2))));
174
+
Printf.printf " S3: %s\n" (String.escaped (String.sub s3 0 (min 100 (String.length s3))));
175
+
false
176
+
end else
177
+
true
178
+
with e ->
179
+
Printf.printf "EXCEPTION [%s]: %s\n" category (Printexc.to_string e);
180
+
Printf.printf " Input: %s\n" (String.escaped input);
181
+
false
182
+
183
+
let run_category name cases =
184
+
let passed = ref 0 in
185
+
let failed = ref 0 in
186
+
Array.iter (fun input ->
187
+
if test_error_recovery input name then
188
+
incr passed
189
+
else
190
+
incr failed
191
+
) cases;
192
+
Printf.printf "%s: %d/%d passed\n" name !passed (Array.length cases);
193
+
!failed = 0
194
+
195
+
let () =
196
+
let all_pass = ref true in
197
+
198
+
let categories = [
199
+
("unclosed_tags", unclosed_tag_cases);
200
+
("misnested", misnested_cases);
201
+
("invalid_tags", invalid_tag_cases);
202
+
("invalid_attrs", invalid_attr_cases);
203
+
("premature_eof", premature_eof_cases);
204
+
("semantic_nesting", semantic_nesting_cases);
205
+
("foreign_content", foreign_content_cases);
206
+
("doctype", doctype_cases);
207
+
("comments", comment_cases);
208
+
("entities", entity_cases);
209
+
("rawtext", rawtext_cases);
210
+
("tables", table_cases);
211
+
] in
212
+
213
+
List.iter (fun (name, cases) ->
214
+
if not (run_category name cases) then
215
+
all_pass := false
216
+
) categories;
217
+
218
+
Printf.printf "\n=== Summary ===\n";
219
+
if !all_pass then
220
+
Printf.printf "All error recovery tests passed!\n"
221
+
else begin
222
+
Printf.printf "Some error recovery tests failed!\n";
223
+
exit 1
224
+
end
+256
fuzz/fuzz_exhaustion.ml
+256
fuzz/fuzz_exhaustion.ml
···
1
+
(* Resource exhaustion tests for HTML5rw
2
+
Tests for algorithmic complexity bugs, memory issues, and DoS vectors *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Timing helper *)
7
+
let time_it f =
8
+
let start = Unix.gettimeofday () in
9
+
let result = f () in
10
+
let elapsed = Unix.gettimeofday () -. start in
11
+
(result, elapsed)
12
+
13
+
(* Test 1: Deeply nested elements *)
14
+
(* Note: Deep nesting can exhibit O(nยฒ) complexity in tree construction.
15
+
The timing thresholds are set to catch severe regressions while allowing
16
+
for some expected slowdown with very deep nesting. *)
17
+
let test_deep_nesting depth =
18
+
let input = String.concat "" (List.init depth (fun _ -> "<div>")) in
19
+
let (_, elapsed) = time_it (fun () ->
20
+
try
21
+
let r = Html5rw.parse (reader_of_string input) in
22
+
let _ = Html5rw.to_string r in
23
+
true
24
+
with _ -> false
25
+
) in
26
+
(* Allow quadratic behavior up to a reasonable limit for very deep nesting.
27
+
HTML5 spec allows implementations to impose nesting limits for DoS protection. *)
28
+
let max_time =
29
+
if depth <= 1000 then float depth *. 0.001 +. 1.0
30
+
else float depth *. 0.02 +. 30.0 (* Very lenient for extreme depth - known O(nยฒ) case *)
31
+
in
32
+
if elapsed > max_time then begin
33
+
Printf.printf "SLOW: deep_nesting(%d) took %.3fs (max %.3fs)\n" depth elapsed max_time;
34
+
false
35
+
end else
36
+
true
37
+
38
+
(* Test 2: Wide trees (many siblings) *)
39
+
let test_wide_tree width =
40
+
let children = String.concat "" (List.init width (fun i -> Printf.sprintf "<span>%d</span>" i)) in
41
+
let input = "<div>" ^ children ^ "</div>" in
42
+
let (_, elapsed) = time_it (fun () ->
43
+
try
44
+
let r = Html5rw.parse (reader_of_string input) in
45
+
let _ = Html5rw.to_string r in
46
+
true
47
+
with _ -> false
48
+
) in
49
+
let max_time = float width *. 0.0001 +. 0.5 in
50
+
if elapsed > max_time then begin
51
+
Printf.printf "SLOW: wide_tree(%d) took %.3fs (max %.3fs)\n" width elapsed max_time;
52
+
false
53
+
end else
54
+
true
55
+
56
+
(* Test 3: Huge text nodes *)
57
+
let test_huge_text size =
58
+
let text = String.make size 'x' in
59
+
let input = "<div>" ^ text ^ "</div>" in
60
+
let (_, elapsed) = time_it (fun () ->
61
+
try
62
+
let r = Html5rw.parse (reader_of_string input) in
63
+
let _ = Html5rw.to_string r in
64
+
true
65
+
with _ -> false
66
+
) in
67
+
let max_time = float size *. 0.00001 +. 0.5 in
68
+
if elapsed > max_time then begin
69
+
Printf.printf "SLOW: huge_text(%d) took %.3fs (max %.3fs)\n" size elapsed max_time;
70
+
false
71
+
end else
72
+
true
73
+
74
+
(* Test 4: Many attributes *)
75
+
let test_many_attrs count =
76
+
let attrs = String.concat " " (List.init count (fun i -> Printf.sprintf "a%d=\"v%d\"" i i)) in
77
+
let input = Printf.sprintf "<div %s></div>" attrs in
78
+
let (_, elapsed) = time_it (fun () ->
79
+
try
80
+
let r = Html5rw.parse (reader_of_string input) in
81
+
let _ = Html5rw.to_string r in
82
+
true
83
+
with _ -> false
84
+
) in
85
+
let max_time = float count *. 0.0001 +. 0.5 in
86
+
if elapsed > max_time then begin
87
+
Printf.printf "SLOW: many_attrs(%d) took %.3fs (max %.3fs)\n" count elapsed max_time;
88
+
false
89
+
end else
90
+
true
91
+
92
+
(* Test 5: Huge attribute values *)
93
+
let test_huge_attr_value size =
94
+
let value = String.make size 'x' in
95
+
let input = Printf.sprintf "<div data-x=\"%s\"></div>" value in
96
+
let (_, elapsed) = time_it (fun () ->
97
+
try
98
+
let r = Html5rw.parse (reader_of_string input) in
99
+
let _ = Html5rw.to_string r in
100
+
true
101
+
with _ -> false
102
+
) in
103
+
let max_time = float size *. 0.00001 +. 0.5 in
104
+
if elapsed > max_time then begin
105
+
Printf.printf "SLOW: huge_attr_value(%d) took %.3fs (max %.3fs)\n" size elapsed max_time;
106
+
false
107
+
end else
108
+
true
109
+
110
+
(* Test 6: Repeated unclosed p tags (adoption agency stress test) *)
111
+
let test_repeated_p count =
112
+
let input = String.concat "" (List.init count (fun _ -> "<p>")) in
113
+
let (_, elapsed) = time_it (fun () ->
114
+
try
115
+
let r = Html5rw.parse (reader_of_string input) in
116
+
let _ = Html5rw.to_string r in
117
+
true
118
+
with _ -> false
119
+
) in
120
+
(* This could trigger O(n^2) behavior in naive implementations *)
121
+
let max_time = float count *. 0.001 +. 1.0 in
122
+
if elapsed > max_time then begin
123
+
Printf.printf "SLOW: repeated_p(%d) took %.3fs (max %.3fs)\n" count elapsed max_time;
124
+
false
125
+
end else
126
+
true
127
+
128
+
(* Test 7: Nested formatting elements (adoption agency stress) *)
129
+
let test_nested_formatting depth =
130
+
let tags = [| "a"; "b"; "i"; "em"; "strong" |] in
131
+
let open_tags = String.concat "" (List.init depth (fun i -> "<" ^ tags.(i mod 5) ^ ">")) in
132
+
let input = open_tags ^ "text" in
133
+
let (_, elapsed) = time_it (fun () ->
134
+
try
135
+
let r = Html5rw.parse (reader_of_string input) in
136
+
let _ = Html5rw.to_string r in
137
+
true
138
+
with _ -> false
139
+
) in
140
+
let max_time = float depth *. 0.001 +. 0.5 in
141
+
if elapsed > max_time then begin
142
+
Printf.printf "SLOW: nested_formatting(%d) took %.3fs (max %.3fs)\n" depth elapsed max_time;
143
+
false
144
+
end else
145
+
true
146
+
147
+
(* Test 8: Table with many cells *)
148
+
let test_large_table rows cols =
149
+
let cells = String.concat "" (List.init cols (fun _ -> "<td>x</td>")) in
150
+
let row = "<tr>" ^ cells ^ "</tr>" in
151
+
let tbody = String.concat "" (List.init rows (fun _ -> row)) in
152
+
let input = "<table><tbody>" ^ tbody ^ "</tbody></table>" in
153
+
let (_, elapsed) = time_it (fun () ->
154
+
try
155
+
let r = Html5rw.parse (reader_of_string input) in
156
+
let _ = Html5rw.to_string r in
157
+
true
158
+
with _ -> false
159
+
) in
160
+
let total = rows * cols in
161
+
let max_time = float total *. 0.0001 +. 1.0 in
162
+
if elapsed > max_time then begin
163
+
Printf.printf "SLOW: large_table(%dx%d) took %.3fs (max %.3fs)\n" rows cols elapsed max_time;
164
+
false
165
+
end else
166
+
true
167
+
168
+
(* Test 9: Deeply nested tables *)
169
+
let test_nested_tables depth =
170
+
let rec make_table d =
171
+
if d = 0 then "x"
172
+
else "<table><tr><td>" ^ make_table (d - 1) ^ "</td></tr></table>"
173
+
in
174
+
let input = make_table depth in
175
+
let (_, elapsed) = time_it (fun () ->
176
+
try
177
+
let r = Html5rw.parse (reader_of_string input) in
178
+
let _ = Html5rw.to_string r in
179
+
true
180
+
with _ -> false
181
+
) in
182
+
let max_time = float depth *. 0.01 +. 0.5 in
183
+
if elapsed > max_time then begin
184
+
Printf.printf "SLOW: nested_tables(%d) took %.3fs (max %.3fs)\n" depth elapsed max_time;
185
+
false
186
+
end else
187
+
true
188
+
189
+
(* Test 10: Many entity references *)
190
+
let test_many_entities count =
191
+
let entities = String.concat "" (List.init count (fun _ -> "&")) in
192
+
let input = "<div>" ^ entities ^ "</div>" in
193
+
let (_, elapsed) = time_it (fun () ->
194
+
try
195
+
let r = Html5rw.parse (reader_of_string input) in
196
+
let _ = Html5rw.to_string r in
197
+
true
198
+
with _ -> false
199
+
) in
200
+
let max_time = float count *. 0.0001 +. 0.5 in
201
+
if elapsed > max_time then begin
202
+
Printf.printf "SLOW: many_entities(%d) took %.3fs (max %.3fs)\n" count elapsed max_time;
203
+
false
204
+
end else
205
+
true
206
+
207
+
(* Run all exhaustion tests *)
208
+
let run_all_tests () =
209
+
let tests = [
210
+
("deep_nesting_100", fun () -> test_deep_nesting 100);
211
+
("deep_nesting_1000", fun () -> test_deep_nesting 1000);
212
+
("deep_nesting_5000", fun () -> test_deep_nesting 5000);
213
+
("wide_tree_100", fun () -> test_wide_tree 100);
214
+
("wide_tree_1000", fun () -> test_wide_tree 1000);
215
+
("wide_tree_10000", fun () -> test_wide_tree 10000);
216
+
("huge_text_10000", fun () -> test_huge_text 10000);
217
+
("huge_text_100000", fun () -> test_huge_text 100000);
218
+
("many_attrs_100", fun () -> test_many_attrs 100);
219
+
("many_attrs_1000", fun () -> test_many_attrs 1000);
220
+
("huge_attr_10000", fun () -> test_huge_attr_value 10000);
221
+
("huge_attr_100000", fun () -> test_huge_attr_value 100000);
222
+
("repeated_p_100", fun () -> test_repeated_p 100);
223
+
("repeated_p_500", fun () -> test_repeated_p 500);
224
+
("nested_formatting_50", fun () -> test_nested_formatting 50);
225
+
("nested_formatting_200", fun () -> test_nested_formatting 200);
226
+
("large_table_10x10", fun () -> test_large_table 10 10);
227
+
("large_table_100x100", fun () -> test_large_table 100 100);
228
+
("nested_tables_10", fun () -> test_nested_tables 10);
229
+
("nested_tables_50", fun () -> test_nested_tables 50);
230
+
("many_entities_1000", fun () -> test_many_entities 1000);
231
+
("many_entities_10000", fun () -> test_many_entities 10000);
232
+
] in
233
+
234
+
let passed = ref 0 in
235
+
let failed = ref 0 in
236
+
237
+
List.iter (fun (name, test) ->
238
+
Printf.printf "Running %s... %!" name;
239
+
if test () then begin
240
+
Printf.printf "PASS\n%!";
241
+
incr passed
242
+
end else begin
243
+
Printf.printf "FAIL\n%!";
244
+
incr failed
245
+
end
246
+
) tests;
247
+
248
+
Printf.printf "\n=== Summary ===\n";
249
+
Printf.printf "Passed: %d\n" !passed;
250
+
Printf.printf "Failed: %d\n" !failed;
251
+
252
+
!failed = 0
253
+
254
+
let () =
255
+
if not (run_all_tests ()) then
256
+
exit 1
+261
fuzz/fuzz_fragment.ml
+261
fuzz/fuzz_fragment.ml
···
1
+
(* Fragment parsing fuzzer for HTML5rw
2
+
Tests innerHTML-style fragment parsing with various context elements *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* All context element types to test *)
7
+
let html_contexts = [|
8
+
"div"; "span"; "p"; "a"; "b"; "i"; "em"; "strong";
9
+
"ul"; "ol"; "li"; "dl"; "dt"; "dd";
10
+
"table"; "thead"; "tbody"; "tfoot"; "tr"; "th"; "td"; "caption";
11
+
"select"; "optgroup"; "option";
12
+
"form"; "fieldset"; "legend"; "label"; "input"; "button"; "textarea";
13
+
"pre"; "code"; "blockquote";
14
+
"h1"; "h2"; "h3"; "h4"; "h5"; "h6";
15
+
"article"; "section"; "nav"; "aside"; "header"; "footer"; "main";
16
+
"figure"; "figcaption";
17
+
"template";
18
+
|]
19
+
20
+
let svg_contexts = [|
21
+
"svg"; "g"; "circle"; "rect"; "path"; "text"; "tspan";
22
+
"foreignObject"; "title"; "desc";
23
+
|]
24
+
25
+
let math_contexts = [|
26
+
"math"; "mi"; "mo"; "mn"; "ms"; "mrow";
27
+
"annotation-xml";
28
+
|]
29
+
30
+
(* Test fragments for different contexts *)
31
+
let general_fragments = [|
32
+
"text content";
33
+
"<span>inline</span>";
34
+
"<div>block</div>";
35
+
"<a href=\"#\">link</a>";
36
+
"<b><i>nested</i></b>";
37
+
"text<br>text";
38
+
"<!-- comment -->";
39
+
"<img src=\"x\">";
40
+
|]
41
+
42
+
let list_fragments = [|
43
+
"<li>item</li>";
44
+
"<li>one</li><li>two</li>";
45
+
"text in list";
46
+
"<li><ul><li>nested</li></ul></li>";
47
+
|]
48
+
49
+
let table_fragments = [|
50
+
"<tr><td>cell</td></tr>";
51
+
"<td>cell</td>";
52
+
"<th>header</th>";
53
+
"text in table";
54
+
"<tbody><tr><td>x</td></tr></tbody>";
55
+
"<caption>title</caption>";
56
+
|]
57
+
58
+
let select_fragments = [|
59
+
"<option>opt</option>";
60
+
"<option value=\"1\">one</option><option value=\"2\">two</option>";
61
+
"<optgroup label=\"group\"><option>x</option></optgroup>";
62
+
"text in select";
63
+
|]
64
+
65
+
let svg_fragments = [|
66
+
"<circle cx=\"50\" cy=\"50\" r=\"40\"/>";
67
+
"<rect x=\"0\" y=\"0\" width=\"100\" height=\"100\"/>";
68
+
"<text>SVG text</text>";
69
+
"<g><circle r=\"10\"/></g>";
70
+
"<foreignObject><div>HTML in SVG</div></foreignObject>";
71
+
|]
72
+
73
+
let math_fragments = [|
74
+
"<mi>x</mi>";
75
+
"<mo>=</mo>";
76
+
"<mn>42</mn>";
77
+
"<mrow><mi>x</mi><mo>=</mo><mn>1</mn></mrow>";
78
+
|]
79
+
80
+
(* Test parsing a fragment with a given context *)
81
+
let test_fragment_parse ctx_tag ?namespace fragment =
82
+
try
83
+
let ctx = Html5rw.make_fragment_context ~tag_name:ctx_tag ?namespace () in
84
+
let doc = Html5rw.parse ~fragment_context:ctx (reader_of_string fragment) in
85
+
let _ = Html5rw.to_string ~pretty:false doc in
86
+
true
87
+
with e ->
88
+
Printf.printf "Exception: %s\n" (Printexc.to_string e);
89
+
Printf.printf " Context: <%s>\n" ctx_tag;
90
+
Printf.printf " Fragment: %s\n" (String.escaped fragment);
91
+
false
92
+
93
+
(* Test roundtrip stability for fragment parsing *)
94
+
let test_fragment_roundtrip ctx_tag ?namespace fragment =
95
+
try
96
+
let ctx = Html5rw.make_fragment_context ~tag_name:ctx_tag ?namespace () in
97
+
let doc1 = Html5rw.parse ~fragment_context:ctx (reader_of_string fragment) in
98
+
let s1 = Html5rw.to_string ~pretty:false doc1 in
99
+
let doc2 = Html5rw.parse ~fragment_context:ctx (reader_of_string s1) in
100
+
let s2 = Html5rw.to_string ~pretty:false doc2 in
101
+
let doc3 = Html5rw.parse ~fragment_context:ctx (reader_of_string s2) in
102
+
let s3 = Html5rw.to_string ~pretty:false doc3 in
103
+
if s2 <> s3 then begin
104
+
Printf.printf "Roundtrip mismatch:\n";
105
+
Printf.printf " Context: <%s>\n" ctx_tag;
106
+
Printf.printf " S2: %s\n" (String.escaped s2);
107
+
Printf.printf " S3: %s\n" (String.escaped s3);
108
+
false
109
+
end else
110
+
true
111
+
with _ -> false
112
+
113
+
(* Compare fragment parsing with different contexts *)
114
+
let test_context_sensitivity () =
115
+
let test_cases = [|
116
+
(* These should produce different results in different contexts *)
117
+
("<li>item</li>", [| "ul"; "ol"; "div"; "body" |]);
118
+
("<tr><td>x</td></tr>", [| "table"; "tbody"; "div"; "body" |]);
119
+
("<td>x</td>", [| "tr"; "table"; "div"; "body" |]);
120
+
("<option>x</option>", [| "select"; "optgroup"; "div"; "body" |]);
121
+
("<p>text</p>", [| "div"; "p"; "body" |]);
122
+
|] in
123
+
124
+
let all_ok = ref true in
125
+
Array.iter (fun (fragment, contexts) ->
126
+
Array.iter (fun ctx ->
127
+
if not (test_fragment_parse ctx fragment) then begin
128
+
Printf.printf "FAIL: <%s> with fragment: %s\n" ctx fragment;
129
+
all_ok := false
130
+
end
131
+
) contexts
132
+
) test_cases;
133
+
!all_ok
134
+
135
+
(* Run comprehensive tests *)
136
+
let run_all_tests () =
137
+
let all_pass = ref true in
138
+
139
+
Printf.printf "=== Fragment Parsing Tests ===\n\n";
140
+
141
+
(* Test HTML contexts with general fragments *)
142
+
Printf.printf "--- HTML contexts with general fragments ---\n";
143
+
let html_pass = ref 0 in
144
+
let html_fail = ref 0 in
145
+
Array.iter (fun ctx ->
146
+
Array.iter (fun fragment ->
147
+
if test_fragment_parse ctx fragment then
148
+
incr html_pass
149
+
else
150
+
incr html_fail
151
+
) general_fragments
152
+
) html_contexts;
153
+
Printf.printf "HTML contexts: %d/%d\n" !html_pass (!html_pass + !html_fail);
154
+
if !html_fail > 0 then all_pass := false;
155
+
156
+
(* Test list contexts *)
157
+
Printf.printf "\n--- List contexts ---\n";
158
+
let list_pass = ref 0 in
159
+
let list_fail = ref 0 in
160
+
Array.iter (fun ctx ->
161
+
Array.iter (fun fragment ->
162
+
if test_fragment_parse ctx fragment then
163
+
incr list_pass
164
+
else
165
+
incr list_fail
166
+
) list_fragments
167
+
) [| "ul"; "ol"; "menu" |];
168
+
Printf.printf "List contexts: %d/%d\n" !list_pass (!list_pass + !list_fail);
169
+
if !list_fail > 0 then all_pass := false;
170
+
171
+
(* Test table contexts *)
172
+
Printf.printf "\n--- Table contexts ---\n";
173
+
let table_pass = ref 0 in
174
+
let table_fail = ref 0 in
175
+
Array.iter (fun ctx ->
176
+
Array.iter (fun fragment ->
177
+
if test_fragment_parse ctx fragment then
178
+
incr table_pass
179
+
else
180
+
incr table_fail
181
+
) table_fragments
182
+
) [| "table"; "tbody"; "thead"; "tfoot"; "tr" |];
183
+
Printf.printf "Table contexts: %d/%d\n" !table_pass (!table_pass + !table_fail);
184
+
if !table_fail > 0 then all_pass := false;
185
+
186
+
(* Test select contexts *)
187
+
Printf.printf "\n--- Select contexts ---\n";
188
+
let select_pass = ref 0 in
189
+
let select_fail = ref 0 in
190
+
Array.iter (fun ctx ->
191
+
Array.iter (fun fragment ->
192
+
if test_fragment_parse ctx fragment then
193
+
incr select_pass
194
+
else
195
+
incr select_fail
196
+
) select_fragments
197
+
) [| "select"; "optgroup" |];
198
+
Printf.printf "Select contexts: %d/%d\n" !select_pass (!select_pass + !select_fail);
199
+
if !select_fail > 0 then all_pass := false;
200
+
201
+
(* Test SVG contexts *)
202
+
Printf.printf "\n--- SVG contexts ---\n";
203
+
let svg_pass = ref 0 in
204
+
let svg_fail = ref 0 in
205
+
Array.iter (fun ctx ->
206
+
Array.iter (fun fragment ->
207
+
if test_fragment_parse ctx ~namespace:(Some "svg") fragment then
208
+
incr svg_pass
209
+
else
210
+
incr svg_fail
211
+
) svg_fragments
212
+
) svg_contexts;
213
+
Printf.printf "SVG contexts: %d/%d\n" !svg_pass (!svg_pass + !svg_fail);
214
+
if !svg_fail > 0 then all_pass := false;
215
+
216
+
(* Test Math contexts *)
217
+
Printf.printf "\n--- Math contexts ---\n";
218
+
let math_pass = ref 0 in
219
+
let math_fail = ref 0 in
220
+
Array.iter (fun ctx ->
221
+
Array.iter (fun fragment ->
222
+
if test_fragment_parse ctx ~namespace:(Some "math") fragment then
223
+
incr math_pass
224
+
else
225
+
incr math_fail
226
+
) math_fragments
227
+
) math_contexts;
228
+
Printf.printf "Math contexts: %d/%d\n" !math_pass (!math_pass + !math_fail);
229
+
if !math_fail > 0 then all_pass := false;
230
+
231
+
(* Test context sensitivity *)
232
+
Printf.printf "\n--- Context sensitivity ---\n";
233
+
if not (test_context_sensitivity ()) then
234
+
all_pass := false
235
+
else
236
+
Printf.printf "Context sensitivity: OK\n";
237
+
238
+
(* Test roundtrip for a sample *)
239
+
Printf.printf "\n--- Roundtrip stability ---\n";
240
+
let rt_pass = ref 0 in
241
+
let rt_fail = ref 0 in
242
+
Array.iter (fun ctx ->
243
+
Array.iter (fun fragment ->
244
+
if test_fragment_roundtrip ctx fragment then
245
+
incr rt_pass
246
+
else
247
+
incr rt_fail
248
+
) general_fragments
249
+
) [| "div"; "span"; "ul"; "table"; "select" |];
250
+
Printf.printf "Roundtrip: %d/%d\n" !rt_pass (!rt_pass + !rt_fail);
251
+
if !rt_fail > 0 then all_pass := false;
252
+
253
+
Printf.printf "\n=== Summary ===\n";
254
+
if !all_pass then
255
+
Printf.printf "All fragment parsing tests passed!\n"
256
+
else begin
257
+
Printf.printf "Some fragment parsing tests failed!\n";
258
+
exit 1
259
+
end
260
+
261
+
let () = run_all_tests ()
+537
fuzz/fuzz_html5rw.ml
+537
fuzz/fuzz_html5rw.ml
···
1
+
(** Comprehensive fuzz tests for html5rw HTML5 parser using Crowbar *)
2
+
3
+
open Crowbar
4
+
5
+
(* Helper to create a bytes reader from a string *)
6
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
7
+
8
+
(* ==========================================================================
9
+
Generators for HTML-like content
10
+
========================================================================== *)
11
+
12
+
(* Common tag names for structured generation *)
13
+
let tag_names = [
14
+
"div"; "p"; "span"; "a"; "h1"; "h2"; "h3"; "ul"; "li"; "ol";
15
+
"table"; "tr"; "td"; "th"; "thead"; "tbody"; "form"; "input";
16
+
"button"; "select"; "option"; "textarea"; "label"; "img"; "br";
17
+
"hr"; "b"; "i"; "strong"; "em"; "code"; "pre"; "script"; "style";
18
+
"head"; "body"; "html"; "title"; "meta"; "link"; "nav"; "header";
19
+
"footer"; "main"; "section"; "article"; "aside"; "figure"; "svg";
20
+
"math"; "template"; "iframe"; "noscript"; "plaintext"; "xmp";
21
+
]
22
+
23
+
let tag_name_gen = choose (List.map const tag_names)
24
+
25
+
(* Common attribute names *)
26
+
let attr_names = [
27
+
"id"; "class"; "href"; "src"; "style"; "title"; "alt"; "name";
28
+
"type"; "value"; "data-foo"; "aria-label"; "onclick"; "onload";
29
+
]
30
+
31
+
let attr_name_gen = choose (List.map const attr_names)
32
+
33
+
(* Generator for a simple attribute *)
34
+
let attr_gen =
35
+
map [attr_name_gen; bytes] (fun name value ->
36
+
Printf.sprintf "%s=\"%s\"" name (String.escaped value))
37
+
38
+
(* Generator for attributes list *)
39
+
let attrs_gen = list attr_gen
40
+
41
+
(* Generator for a simple opening tag *)
42
+
let start_tag_gen =
43
+
map [tag_name_gen; attrs_gen] (fun tag attrs ->
44
+
let attrs_str = String.concat " " attrs in
45
+
if attrs_str = "" then Printf.sprintf "<%s>" tag
46
+
else Printf.sprintf "<%s %s>" tag attrs_str)
47
+
48
+
(* Generator for a simple closing tag *)
49
+
let end_tag_gen =
50
+
map [tag_name_gen] (fun tag -> Printf.sprintf "</%s>" tag)
51
+
52
+
(* Generator for text content *)
53
+
let text_content_gen =
54
+
choose [
55
+
const "";
56
+
const "Hello";
57
+
const "Hello, world!";
58
+
const "Test <with> special &chars;";
59
+
bytes;
60
+
]
61
+
62
+
(* Generator for comments - used in html_gen via malformed_html_gen *)
63
+
let _comment_gen =
64
+
map [bytes] (fun content ->
65
+
Printf.sprintf "<!--%s-->" content)
66
+
67
+
(* Generator for DOCTYPE *)
68
+
let doctype_gen =
69
+
choose [
70
+
const "<!DOCTYPE html>";
71
+
const "<!doctype html>";
72
+
const "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\">";
73
+
const "<!DOCTYPE>";
74
+
map [bytes] (fun s -> Printf.sprintf "<!DOCTYPE %s>" s);
75
+
]
76
+
77
+
(* Generator for simple HTML fragments *)
78
+
let simple_html_gen =
79
+
map [start_tag_gen; text_content_gen; end_tag_gen]
80
+
(fun start text _end_ -> start ^ text ^ _end_)
81
+
82
+
(* Generator for nested HTML *)
83
+
let nested_html_gen =
84
+
map [start_tag_gen; simple_html_gen; end_tag_gen]
85
+
(fun outer inner _end_ -> outer ^ inner ^ _end_)
86
+
87
+
(* Generator for structured HTML with common patterns *)
88
+
let structured_html_gen =
89
+
choose [
90
+
const "<html><head><title>Test</title></head><body></body></html>";
91
+
const "<!DOCTYPE html><html><body><p>Hello</p></body></html>";
92
+
const "<div><span>text</span></div>";
93
+
const "<table><tr><td>cell</td></tr></table>";
94
+
const "<ul><li>item1</li><li>item2</li></ul>";
95
+
const "<form><input type=\"text\"><button>Submit</button></form>";
96
+
const "<p>First</p><p>Second</p>";
97
+
const "<div><div><div>nested</div></div></div>";
98
+
simple_html_gen;
99
+
nested_html_gen;
100
+
]
101
+
102
+
(* Generator for malformed/edge case HTML *)
103
+
let malformed_html_gen =
104
+
choose [
105
+
const "<";
106
+
const ">";
107
+
const "</";
108
+
const "<>";
109
+
const "<<>>";
110
+
const "<div";
111
+
const "<div>";
112
+
const "</div>";
113
+
const "<div><span>";
114
+
const "<div></span></div>";
115
+
const "<p><div></div></p>";
116
+
const "<!-";
117
+
const "<!--";
118
+
const "<!-->";
119
+
const "<!--->";
120
+
const "<!-- -- -->";
121
+
const "&";
122
+
const "&";
123
+
const "&";
124
+
const "&#";
125
+
const "<";
126
+
const "<";
127
+
const "&#x";
128
+
const "<";
129
+
const "<script>alert('xss')</script>";
130
+
const "<style>body{}</style>";
131
+
const "<![CDATA[test]]>";
132
+
const "<?xml version=\"1.0\"?>";
133
+
const "<svg><foreignObject></foreignObject></svg>";
134
+
const "<math><mi>x</mi></math>";
135
+
const "<template><div>content</div></template>";
136
+
const "<table><div>misplaced</div><tr><td>ok</td></tr></table>";
137
+
map [bytes] (fun s -> "<" ^ s ^ ">");
138
+
map [bytes; bytes] (fun a b -> "<" ^ a ^ " " ^ b ^ ">");
139
+
]
140
+
141
+
(* Combined HTML generator *)
142
+
let html_gen =
143
+
choose [
144
+
bytes; (* Completely random *)
145
+
structured_html_gen; (* Well-structured HTML *)
146
+
malformed_html_gen; (* Known edge cases *)
147
+
map [doctype_gen; structured_html_gen] (fun dt html -> dt ^ html);
148
+
]
149
+
150
+
(* CSS selector generators *)
151
+
let selector_gen =
152
+
choose [
153
+
const "*";
154
+
const "div";
155
+
const "#id";
156
+
const ".class";
157
+
const "div.class";
158
+
const "div#id";
159
+
const "[attr]";
160
+
const "[attr=value]";
161
+
const "[attr~=value]";
162
+
const "[attr|=value]";
163
+
const "[attr^=value]";
164
+
const "[attr$=value]";
165
+
const "[attr*=value]";
166
+
const ":first-child";
167
+
const ":last-child";
168
+
const ":nth-child(1)";
169
+
const ":nth-child(2n+1)";
170
+
const ":only-child";
171
+
const ":empty";
172
+
const ":not(div)";
173
+
const "div > p";
174
+
const "div p";
175
+
const "div + p";
176
+
const "div ~ p";
177
+
const "div, p";
178
+
const "div > p.class#id[attr]:first-child";
179
+
bytes; (* Random selector to find crashes *)
180
+
]
181
+
182
+
(* Fragment context tag names
183
+
Note: raw text elements (script, style, textarea, title, xmp, iframe, etc.)
184
+
are excluded because fragment content parsed in their context cannot
185
+
round-trip correctly - the content is raw text but serialized without
186
+
the element wrapper, so escaping behavior differs. *)
187
+
let fragment_context_gen =
188
+
choose [
189
+
const "div";
190
+
const "body";
191
+
const "html";
192
+
const "table";
193
+
const "tr";
194
+
const "tbody";
195
+
const "thead";
196
+
const "td";
197
+
const "th";
198
+
const "ul";
199
+
const "ol";
200
+
const "select";
201
+
const "template";
202
+
const "svg";
203
+
const "math";
204
+
(* Exclude raw text contexts: script, style, textarea, title *)
205
+
]
206
+
207
+
(* ==========================================================================
208
+
Test 1: Crash resistance - arbitrary input should not crash
209
+
========================================================================== *)
210
+
211
+
let () =
212
+
add_test ~name:"html5rw_no_crash_bytes" [bytes] @@ fun input ->
213
+
let _ =
214
+
try Html5rw.parse (reader_of_string input)
215
+
with _ -> Html5rw.parse (reader_of_string "")
216
+
in
217
+
check true
218
+
219
+
let () =
220
+
add_test ~name:"html5rw_no_crash_html" [html_gen] @@ fun input ->
221
+
let _ =
222
+
try Html5rw.parse (reader_of_string input)
223
+
with _ -> Html5rw.parse (reader_of_string "")
224
+
in
225
+
check true
226
+
227
+
let () =
228
+
add_test ~name:"html5rw_parse_bytes_no_crash" [bytes] @@ fun input ->
229
+
let _ =
230
+
try Html5rw.parse_bytes (Bytes.of_string input)
231
+
with _ -> Html5rw.parse_bytes (Bytes.of_string "")
232
+
in
233
+
check true
234
+
235
+
(* ==========================================================================
236
+
Test 2: Roundtrip - parse -> serialize -> reparse should be consistent
237
+
========================================================================== *)
238
+
239
+
(* Serialize a parse result to string *)
240
+
let serialize result =
241
+
Html5rw.to_string ~pretty:false result
242
+
243
+
(* Compare two DOM trees structurally (text content of serialized output) *)
244
+
let _trees_equivalent result1 result2 =
245
+
let s1 = serialize result1 in
246
+
let s2 = serialize result2 in
247
+
s1 = s2
248
+
249
+
let () =
250
+
add_test ~name:"html5rw_roundtrip_idempotent" [html_gen] @@ fun input ->
251
+
try
252
+
(* Parse original *)
253
+
let result1 = Html5rw.parse (reader_of_string input) in
254
+
let serialized1 = serialize result1 in
255
+
256
+
(* Reparse serialized output *)
257
+
let result2 = Html5rw.parse (reader_of_string serialized1) in
258
+
let serialized2 = serialize result2 in
259
+
260
+
(* The second serialization should equal the first *)
261
+
(* (First parse may normalize, but second should be stable) *)
262
+
if serialized1 <> serialized2 then begin
263
+
Printf.printf "\nRoundtrip mismatch:\n";
264
+
Printf.printf "Input: %s\n" (String.escaped (String.sub input 0 (min 200 (String.length input))));
265
+
Printf.printf "First: %s\n" (String.escaped (String.sub serialized1 0 (min 200 (String.length serialized1))));
266
+
Printf.printf "Second: %s\n" (String.escaped (String.sub serialized2 0 (min 200 (String.length serialized2))));
267
+
check false
268
+
end else
269
+
check true
270
+
with e ->
271
+
Printf.printf "\nRoundtrip exception: %s\n" (Printexc.to_string e);
272
+
check false
273
+
274
+
(* Additional roundtrip test: parse -> serialize -> reparse -> serialize should stabilize *)
275
+
let () =
276
+
add_test ~name:"html5rw_triple_roundtrip" [structured_html_gen] @@ fun input ->
277
+
try
278
+
let r1 = Html5rw.parse (reader_of_string input) in
279
+
let s1 = serialize r1 in
280
+
281
+
let r2 = Html5rw.parse (reader_of_string s1) in
282
+
let s2 = serialize r2 in
283
+
284
+
let r3 = Html5rw.parse (reader_of_string s2) in
285
+
let s3 = serialize r3 in
286
+
287
+
(* By the third roundtrip, output should be stable *)
288
+
if s2 <> s3 then begin
289
+
Printf.printf "\nTriple roundtrip not stable:\n";
290
+
Printf.printf "s2: %s\n" (String.escaped (String.sub s2 0 (min 200 (String.length s2))));
291
+
Printf.printf "s3: %s\n" (String.escaped (String.sub s3 0 (min 200 (String.length s3))));
292
+
check false
293
+
end else
294
+
check true
295
+
with e ->
296
+
Printf.printf "\nTriple roundtrip exception: %s\n" (Printexc.to_string e);
297
+
check false
298
+
299
+
(* ==========================================================================
300
+
Test 3: Serialization idempotence
301
+
========================================================================== *)
302
+
303
+
let () =
304
+
add_test ~name:"html5rw_serialize_idempotent" [html_gen] @@ fun input ->
305
+
try
306
+
let result = Html5rw.parse (reader_of_string input) in
307
+
let s1 = serialize result in
308
+
let s2 = serialize result in
309
+
if s1 <> s2 then begin
310
+
Printf.printf "\nSerialization not idempotent!\n";
311
+
check false
312
+
end else
313
+
check true
314
+
with e ->
315
+
Printf.printf "\nSerialization exception: %s\n" (Printexc.to_string e);
316
+
check false
317
+
318
+
(* ==========================================================================
319
+
Test 4: CSS Selector crash resistance
320
+
========================================================================== *)
321
+
322
+
let () =
323
+
add_test ~name:"html5rw_selector_no_crash" [selector_gen; html_gen] @@ fun selector html ->
324
+
try
325
+
let result = Html5rw.parse (reader_of_string html) in
326
+
let _ = Html5rw.query result selector in
327
+
check true
328
+
with
329
+
| Html5rw.Selector.Selector_error _ -> check true (* Expected for malformed selectors *)
330
+
| e ->
331
+
Printf.printf "\nUnexpected selector exception: %s\n" (Printexc.to_string e);
332
+
Printf.printf "Selector: %s\n" (String.escaped selector);
333
+
check false
334
+
335
+
let () =
336
+
add_test ~name:"html5rw_matches_no_crash" [selector_gen; html_gen] @@ fun selector html ->
337
+
try
338
+
let result = Html5rw.parse (reader_of_string html) in
339
+
let root = Html5rw.root result in
340
+
let _ = Html5rw.matches root selector in
341
+
check true
342
+
with
343
+
| Html5rw.Selector.Selector_error _ -> check true
344
+
| e ->
345
+
Printf.printf "\nUnexpected matches exception: %s\n" (Printexc.to_string e);
346
+
check false
347
+
348
+
(* ==========================================================================
349
+
Test 5: Fragment parsing
350
+
========================================================================== *)
351
+
352
+
let () =
353
+
add_test ~name:"html5rw_fragment_no_crash" [fragment_context_gen; html_gen]
354
+
@@ fun ctx_tag html ->
355
+
try
356
+
let ctx = Html5rw.make_fragment_context ~tag_name:ctx_tag () in
357
+
let _ = Html5rw.parse ~fragment_context:ctx (reader_of_string html) in
358
+
check true
359
+
with e ->
360
+
Printf.printf "\nFragment parse exception with context '%s': %s\n"
361
+
ctx_tag (Printexc.to_string e);
362
+
check false
363
+
364
+
(* Fragment roundtrip *)
365
+
let () =
366
+
add_test ~name:"html5rw_fragment_roundtrip" [fragment_context_gen; structured_html_gen]
367
+
@@ fun ctx_tag html ->
368
+
try
369
+
let ctx = Html5rw.make_fragment_context ~tag_name:ctx_tag () in
370
+
let r1 = Html5rw.parse ~fragment_context:ctx (reader_of_string html) in
371
+
let s1 = serialize r1 in
372
+
373
+
let r2 = Html5rw.parse ~fragment_context:ctx (reader_of_string s1) in
374
+
let s2 = serialize r2 in
375
+
376
+
let r3 = Html5rw.parse ~fragment_context:ctx (reader_of_string s2) in
377
+
let s3 = serialize r3 in
378
+
379
+
if s2 <> s3 then begin
380
+
Printf.printf "\nFragment roundtrip not stable with context '%s'\n" ctx_tag;
381
+
Printf.printf "Input: %s\n" (String.escaped (String.sub html 0 (min 100 (String.length html))));
382
+
Printf.printf "s1: %s\n" (String.escaped (String.sub s1 0 (min 100 (String.length s1))));
383
+
Printf.printf "s2: %s\n" (String.escaped (String.sub s2 0 (min 100 (String.length s2))));
384
+
Printf.printf "s3: %s\n" (String.escaped (String.sub s3 0 (min 100 (String.length s3))));
385
+
check false
386
+
end else
387
+
check true
388
+
with e ->
389
+
Printf.printf "\nFragment roundtrip exception: %s\n" (Printexc.to_string e);
390
+
check false
391
+
392
+
(* ==========================================================================
393
+
Test 6: DOM manipulation consistency
394
+
========================================================================== *)
395
+
396
+
let () =
397
+
add_test ~name:"html5rw_dom_manipulation" [tag_name_gen; bytes] @@ fun tag text ->
398
+
try
399
+
(* Create element, add text, serialize, reparse *)
400
+
let elem = Html5rw.create_element tag () in
401
+
let text_node = Html5rw.create_text text in
402
+
Html5rw.append_child elem text_node;
403
+
404
+
(* Create a document to hold it *)
405
+
let doc = Html5rw.create_document () in
406
+
let html = Html5rw.create_element "html" () in
407
+
let body = Html5rw.create_element "body" () in
408
+
Html5rw.append_child doc html;
409
+
Html5rw.append_child html body;
410
+
Html5rw.append_child body elem;
411
+
412
+
(* Serialize via Dom.to_html *)
413
+
let serialized = Html5rw.Dom.to_html ~pretty:false doc in
414
+
415
+
(* Reparse *)
416
+
let result = Html5rw.parse (reader_of_string serialized) in
417
+
let _ = Html5rw.to_string result in
418
+
check true
419
+
with e ->
420
+
Printf.printf "\nDOM manipulation exception: %s\n" (Printexc.to_string e);
421
+
check false
422
+
423
+
(* ==========================================================================
424
+
Test 7: Text extraction consistency
425
+
========================================================================== *)
426
+
427
+
let () =
428
+
add_test ~name:"html5rw_text_extraction" [html_gen] @@ fun html ->
429
+
try
430
+
let result = Html5rw.parse (reader_of_string html) in
431
+
let _ = Html5rw.to_text result in
432
+
check true
433
+
with e ->
434
+
Printf.printf "\nText extraction exception: %s\n" (Printexc.to_string e);
435
+
check false
436
+
437
+
(* ==========================================================================
438
+
Test 8: Clone consistency
439
+
========================================================================== *)
440
+
441
+
let () =
442
+
add_test ~name:"html5rw_clone_deep" [html_gen] @@ fun html ->
443
+
try
444
+
let result = Html5rw.parse (reader_of_string html) in
445
+
let root = Html5rw.root result in
446
+
let cloned = Html5rw.clone ~deep:true root in
447
+
448
+
(* Serialize both and compare *)
449
+
let original_html = Html5rw.Dom.to_html ~pretty:false root in
450
+
let cloned_html = Html5rw.Dom.to_html ~pretty:false cloned in
451
+
452
+
if original_html <> cloned_html then begin
453
+
Printf.printf "\nClone mismatch:\n";
454
+
Printf.printf "Original: %s\n" (String.escaped (String.sub original_html 0 (min 200 (String.length original_html))));
455
+
Printf.printf "Cloned: %s\n" (String.escaped (String.sub cloned_html 0 (min 200 (String.length cloned_html))));
456
+
check false
457
+
end else
458
+
check true
459
+
with e ->
460
+
Printf.printf "\nClone exception: %s\n" (Printexc.to_string e);
461
+
check false
462
+
463
+
(* ==========================================================================
464
+
Test 9: Error collection should not affect parsing result
465
+
========================================================================== *)
466
+
467
+
let () =
468
+
add_test ~name:"html5rw_error_collection_consistent" [html_gen] @@ fun html ->
469
+
try
470
+
let r1 = Html5rw.parse ~collect_errors:false (reader_of_string html) in
471
+
let r2 = Html5rw.parse ~collect_errors:true (reader_of_string html) in
472
+
473
+
let s1 = serialize r1 in
474
+
let s2 = serialize r2 in
475
+
476
+
if s1 <> s2 then begin
477
+
Printf.printf "\nError collection changes output!\n";
478
+
Printf.printf "Without: %s\n" (String.escaped (String.sub s1 0 (min 200 (String.length s1))));
479
+
Printf.printf "With: %s\n" (String.escaped (String.sub s2 0 (min 200 (String.length s2))));
480
+
check false
481
+
end else
482
+
check true
483
+
with e ->
484
+
Printf.printf "\nError collection exception: %s\n" (Printexc.to_string e);
485
+
check false
486
+
487
+
(* ==========================================================================
488
+
Test 10: Pretty printing should produce parseable HTML
489
+
========================================================================== *)
490
+
491
+
(* Helper to normalize whitespace for comparison
492
+
Pretty printing adds whitespace that becomes text nodes, so we compare
493
+
text content only to verify semantic equivalence.
494
+
We collapse all whitespace sequences to single spaces. *)
495
+
let normalize_for_comparison result =
496
+
let text = Html5rw.to_text ~separator:" " ~strip:true result in
497
+
(* Collapse whitespace sequences *)
498
+
let buf = Buffer.create (String.length text) in
499
+
let in_space = ref false in
500
+
String.iter (fun c ->
501
+
match c with
502
+
| ' ' | '\t' | '\n' | '\r' ->
503
+
if not !in_space then begin
504
+
Buffer.add_char buf ' ';
505
+
in_space := true
506
+
end
507
+
| c ->
508
+
Buffer.add_char buf c;
509
+
in_space := false
510
+
) text;
511
+
String.trim (Buffer.contents buf)
512
+
513
+
let () =
514
+
add_test ~name:"html5rw_pretty_print_parseable" [html_gen] @@ fun html ->
515
+
try
516
+
let r1 = Html5rw.parse (reader_of_string html) in
517
+
let pretty = Html5rw.to_string ~pretty:true r1 in
518
+
let compact = Html5rw.to_string ~pretty:false r1 in
519
+
520
+
(* Both should reparse to have same text content *)
521
+
let r_pretty = Html5rw.parse (reader_of_string pretty) in
522
+
let r_compact = Html5rw.parse (reader_of_string compact) in
523
+
524
+
let text_pretty = normalize_for_comparison r_pretty in
525
+
let text_compact = normalize_for_comparison r_compact in
526
+
527
+
if text_pretty <> text_compact then begin
528
+
Printf.printf "\nPretty/compact text content mismatch!\n";
529
+
Printf.printf "Input: %s\n" (String.escaped (String.sub html 0 (min 100 (String.length html))));
530
+
Printf.printf "Pretty text: %s\n" (String.escaped text_pretty);
531
+
Printf.printf "Compact text: %s\n" (String.escaped text_compact);
532
+
check false
533
+
end else
534
+
check true
535
+
with e ->
536
+
Printf.printf "\nPretty print exception: %s\n" (Printexc.to_string e);
537
+
check false
+149
fuzz/fuzz_properties.ml
+149
fuzz/fuzz_properties.ml
···
1
+
(* Property-based testing for HTML5rw
2
+
Tests invariants that should always hold regardless of input *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Property 1: Parsing never raises exceptions on any input *)
7
+
let test_parse_no_exception input =
8
+
try
9
+
let _ = Html5rw.parse (reader_of_string input) in
10
+
true
11
+
with _ -> false
12
+
13
+
(* Property 2: Serialization never raises exceptions *)
14
+
let test_serialize_no_exception input =
15
+
try
16
+
let result = Html5rw.parse (reader_of_string input) in
17
+
let _ = Html5rw.to_string result in
18
+
true
19
+
with _ -> false
20
+
21
+
(* Property 3: Serialized output is never longer than a reasonable bound *)
22
+
let test_output_bounded input =
23
+
try
24
+
let result = Html5rw.parse (reader_of_string input) in
25
+
let output = Html5rw.to_string ~pretty:false result in
26
+
(* Output should not be more than 10x input + base HTML structure *)
27
+
String.length output <= (String.length input * 10) + 1000
28
+
with _ -> false
29
+
30
+
(* Property 4: DOM tree depth is bounded *)
31
+
let rec tree_depth node =
32
+
let child_depths = List.map tree_depth node.Html5rw.Dom.children in
33
+
1 + (List.fold_left max 0 child_depths)
34
+
35
+
let test_depth_bounded input =
36
+
try
37
+
let result = Html5rw.parse (reader_of_string input) in
38
+
let depth = tree_depth (Html5rw.root result) in
39
+
(* Depth should not exceed input length (at most one level per char) *)
40
+
depth <= String.length input + 10
41
+
with _ -> false
42
+
43
+
(* Property 5: All text content from input appears somewhere in DOM *)
44
+
let rec collect_text node =
45
+
if node.Html5rw.Dom.name = "#text" then
46
+
[node.Html5rw.Dom.data]
47
+
else
48
+
List.concat_map collect_text node.Html5rw.Dom.children
49
+
50
+
let test_text_preserved input =
51
+
try
52
+
let result = Html5rw.parse (reader_of_string input) in
53
+
let dom_text = String.concat "" (collect_text (Html5rw.root result)) in
54
+
(* Every non-tag character should appear in text content or be structural *)
55
+
let input_text = Str.global_replace (Str.regexp "<[^>]*>") "" input in
56
+
let input_text = Str.global_replace (Str.regexp "&[a-zA-Z]+;") "" input_text in
57
+
(* Relaxed check: DOM text should have substantial overlap with input text *)
58
+
String.length dom_text >= (String.length input_text / 4) || String.length input_text < 10
59
+
with _ -> true (* Parse errors are ok *)
60
+
61
+
(* Property 6: Element count is bounded by tag markers in input *)
62
+
let rec count_elements node =
63
+
let is_element = not (String.length node.Html5rw.Dom.name > 0 && node.Html5rw.Dom.name.[0] = '#') in
64
+
let child_count = List.fold_left (+) 0 (List.map count_elements node.Html5rw.Dom.children) in
65
+
(if is_element then 1 else 0) + child_count
66
+
67
+
let count_char c s =
68
+
let count = ref 0 in
69
+
String.iter (fun ch -> if ch = c then incr count) s;
70
+
!count
71
+
72
+
let test_element_count_bounded input =
73
+
try
74
+
let result = Html5rw.parse (reader_of_string input) in
75
+
let elem_count = count_elements (Html5rw.root result) in
76
+
let lt_count = count_char '<' input in
77
+
(* Element count should not exceed < count + implicit elements (html, head, body) *)
78
+
elem_count <= lt_count + 10
79
+
with _ -> false
80
+
81
+
(* Property 7: Attribute values survive roundtrip (modulo escaping) *)
82
+
let rec collect_attrs node =
83
+
let own_attrs = node.Html5rw.Dom.attrs in
84
+
let child_attrs = List.concat_map collect_attrs node.Html5rw.Dom.children in
85
+
own_attrs @ child_attrs
86
+
87
+
let unescape_html s =
88
+
let s = Str.global_replace (Str.regexp "&") "&" s in
89
+
let s = Str.global_replace (Str.regexp "<") "<" s in
90
+
let s = Str.global_replace (Str.regexp ">") ">" s in
91
+
let s = Str.global_replace (Str.regexp """) "\"" s in
92
+
let s = Str.global_replace (Str.regexp "'") "'" s in
93
+
s
94
+
95
+
let test_attr_roundtrip input =
96
+
try
97
+
let r1 = Html5rw.parse (reader_of_string input) in
98
+
let s1 = Html5rw.to_string ~pretty:false r1 in
99
+
let r2 = Html5rw.parse (reader_of_string s1) in
100
+
let attrs1 = collect_attrs (Html5rw.root r1) in
101
+
let attrs2 = collect_attrs (Html5rw.root r2) in
102
+
(* After roundtrip, attribute values should match (modulo escaping) *)
103
+
let normalize_attrs attrs =
104
+
List.sort compare (List.map (fun (k, v) -> (k, unescape_html v)) attrs)
105
+
in
106
+
normalize_attrs attrs1 = normalize_attrs attrs2 ||
107
+
(* Allow some attrs to be dropped if they have invalid names *)
108
+
List.length attrs2 <= List.length attrs1
109
+
with _ -> true
110
+
111
+
(* Property 8: Idempotent after first roundtrip *)
112
+
let test_idempotent input =
113
+
try
114
+
let r1 = Html5rw.parse (reader_of_string input) in
115
+
let s1 = Html5rw.to_string ~pretty:false r1 in
116
+
let r2 = Html5rw.parse (reader_of_string s1) in
117
+
let s2 = Html5rw.to_string ~pretty:false r2 in
118
+
let r3 = Html5rw.parse (reader_of_string s2) in
119
+
let s3 = Html5rw.to_string ~pretty:false r3 in
120
+
s2 = s3
121
+
with _ -> false
122
+
123
+
(* Run all property tests *)
124
+
let run_all_properties input =
125
+
let results = [
126
+
("parse_no_exception", test_parse_no_exception input);
127
+
("serialize_no_exception", test_serialize_no_exception input);
128
+
("output_bounded", test_output_bounded input);
129
+
("depth_bounded", test_depth_bounded input);
130
+
("text_preserved", test_text_preserved input);
131
+
("element_count_bounded", test_element_count_bounded input);
132
+
("attr_roundtrip", test_attr_roundtrip input);
133
+
("idempotent", test_idempotent input);
134
+
] in
135
+
let failures = List.filter (fun (_, ok) -> not ok) results in
136
+
if failures <> [] then begin
137
+
Printf.printf "PROPERTY FAILURES for input: %s\n" (String.escaped (String.sub input 0 (min 100 (String.length input))));
138
+
List.iter (fun (name, _) -> Printf.printf " - %s\n" name) failures;
139
+
false
140
+
end else
141
+
true
142
+
143
+
(* AFL entry point *)
144
+
let () =
145
+
AflPersistent.run (fun () ->
146
+
let input = In_channel.input_all In_channel.stdin in
147
+
if not (run_all_properties input) then
148
+
exit 1
149
+
)
+245
fuzz/fuzz_security.ml
+245
fuzz/fuzz_security.ml
···
1
+
(* Security/sanitizer testing for HTML5rw
2
+
Tests XSS vectors, mXSS patterns, and security-relevant parsing behavior *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Helper to check if script-like content appears in output *)
7
+
let contains_script_tag output =
8
+
let output_lower = String.lowercase_ascii output in
9
+
String.length output_lower >= 7 &&
10
+
(try let _ = Str.search_forward (Str.regexp "<script") output_lower 0 in true with Not_found -> false)
11
+
12
+
(* Reserved for future use in sanitizer testing *)
13
+
let _contains_event_handler output =
14
+
let output_lower = String.lowercase_ascii output in
15
+
try let _ = Str.search_forward (Str.regexp "on[a-z]+=") output_lower 0 in true with Not_found -> false
16
+
17
+
let _contains_javascript_url output =
18
+
let output_lower = String.lowercase_ascii output in
19
+
try let _ = Str.search_forward (Str.regexp "javascript:") output_lower 0 in true with Not_found -> false
20
+
21
+
(* Test parsing and serialization *)
22
+
let parse_and_serialize input =
23
+
try
24
+
let doc = Html5rw.parse (reader_of_string input) in
25
+
Some (Html5rw.to_string ~pretty:false doc)
26
+
with _ -> None
27
+
28
+
(* Category 1: Basic XSS vectors (these should parse cleanly, not be sanitized) *)
29
+
let basic_xss_vectors = [|
30
+
"<script>alert(1)</script>";
31
+
"<img src=x onerror=alert(1)>";
32
+
"<svg onload=alert(1)>";
33
+
"<body onload=alert(1)>";
34
+
"<a href=\"javascript:alert(1)\">click</a>";
35
+
"<iframe src=\"javascript:alert(1)\">";
36
+
"<input onfocus=alert(1) autofocus>";
37
+
"<marquee onstart=alert(1)>";
38
+
"<video><source onerror=alert(1)>";
39
+
"<details ontoggle=alert(1) open>";
40
+
|]
41
+
42
+
(* Category 2: Obfuscated XSS (parser should handle these consistently) *)
43
+
let obfuscated_xss = [|
44
+
(* Case variations *)
45
+
"<ScRiPt>alert(1)</sCrIpT>";
46
+
"<IMG SRC=x ONERROR=alert(1)>";
47
+
"<SVG ONLOAD=alert(1)>";
48
+
49
+
(* Whitespace variations *)
50
+
"<script\n>alert(1)</script>";
51
+
"<script\t>alert(1)</script>";
52
+
"<script\r>alert(1)</script>";
53
+
"<img src=x\nonerror=alert(1)>";
54
+
55
+
(* Null bytes (should be handled) *)
56
+
"<scr\x00ipt>alert(1)</script>";
57
+
"<img src=x onerr\x00or=alert(1)>";
58
+
59
+
(* Entity encoding in attributes *)
60
+
"<a href=\"javascript:alert(1)\">x</a>";
61
+
"<a href=\"javascript:alert(1)\">x</a>";
62
+
"<img src=x onerror=alert(1)>";
63
+
|]
64
+
65
+
(* Category 3: mXSS patterns (mutation XSS through parser quirks) *)
66
+
let mxss_patterns = [|
67
+
(* Backtick in attributes *)
68
+
"<img src=`x`onerror=alert(1)>";
69
+
"<div style=`background:url(x)`onmouseover=alert(1)>";
70
+
71
+
(* Unclosed tags/attributes *)
72
+
"<img src=\"x\" onerror=\"alert(1)";
73
+
"<img src=x onerror=alert(1)//";
74
+
"<div attr=\"></div><script>alert(1)</script>";
75
+
76
+
(* Tag breaking *)
77
+
"<div><script>alert(1)</script";
78
+
"<div><<script>alert(1)</script>";
79
+
"</title><script>alert(1)</script>";
80
+
81
+
(* Foreign content escapes *)
82
+
"<svg><![CDATA[<script>alert(1)</script>]]></svg>";
83
+
"<svg><foreignObject><script>alert(1)</script></foreignObject></svg>";
84
+
"<math><mtext><script>alert(1)</script></mtext></math>";
85
+
86
+
(* Template injection *)
87
+
"<template><script>alert(1)</script></template>";
88
+
89
+
(* Noscript edge cases *)
90
+
"<noscript><script>alert(1)</script></noscript>";
91
+
|]
92
+
93
+
(* Category 4: Attribute injection patterns *)
94
+
let attr_injection = [|
95
+
(* Breaking out of attributes *)
96
+
"<div title=\"x\" onclick=\"alert(1)\">x</div>";
97
+
"<div title='x' onclick='alert(1)'>x</div>";
98
+
"<div title=x onclick=alert(1)>x</div>";
99
+
100
+
(* Attribute without value *)
101
+
"<input value=\"x\" onfocus autofocus>";
102
+
103
+
(* Multiple attributes *)
104
+
"<div a=1 b=2 onclick=alert(1) c=3>x</div>";
105
+
106
+
(* Quote mismatches *)
107
+
"<div title=\"x'onclick=alert(1)//\">x</div>";
108
+
"<div title='x\"onclick=alert(1)//'>x</div>";
109
+
110
+
(* Entity in attribute names *)
111
+
"<div onclick=alert(1)>x</div>";
112
+
|]
113
+
114
+
(* Category 5: URL-based attacks *)
115
+
let url_attacks = [|
116
+
"<a href=\"javascript:alert(1)\">x</a>";
117
+
"<a href=\"JAVASCRIPT:alert(1)\">x</a>";
118
+
"<a href=\" javascript:alert(1)\">x</a>";
119
+
"<a href=\"javascript:alert(1)\">x</a>";
120
+
"<a href=\"java\tscript:alert(1)\">x</a>";
121
+
"<a href=\"java\nscript:alert(1)\">x</a>";
122
+
"<a href=\"java\rscript:alert(1)\">x</a>";
123
+
"<a href=\"data:text/html,<script>alert(1)</script>\">x</a>";
124
+
"<a href=\"vbscript:alert(1)\">x</a>";
125
+
"<iframe src=\"javascript:alert(1)\">";
126
+
"<embed src=\"javascript:alert(1)\">";
127
+
"<object data=\"javascript:alert(1)\">";
128
+
"<form action=\"javascript:alert(1)\">";
129
+
|]
130
+
131
+
(* Category 6: Style-based attacks *)
132
+
let style_attacks = [|
133
+
"<div style=\"background:url(javascript:alert(1))\">x</div>";
134
+
"<div style=\"expression(alert(1))\">x</div>";
135
+
"<div style=\"-moz-binding:url(http://evil.com/xss.xml#xss)\">x</div>";
136
+
"<style>@import 'http://evil.com/xss.css';</style>";
137
+
"<style>body { background: url('javascript:alert(1)'); }</style>";
138
+
"<link rel=\"stylesheet\" href=\"javascript:alert(1)\">";
139
+
|]
140
+
141
+
(* Category 7: Tag soup and parser confusion *)
142
+
let tag_soup = [|
143
+
"<div<div>test</div>";
144
+
"<div<<div>>test</div>";
145
+
"<<div>>test</div>";
146
+
"<div>test</div</div>>";
147
+
"</</div>>";
148
+
"</ div>";
149
+
"<div / onclick=alert(1)>";
150
+
"<div/onclick=alert(1)>";
151
+
"<div><</div>";
152
+
"<div>></div>";
153
+
"<div><script>alert(1)</script></div>";
154
+
|]
155
+
156
+
(* Test that parsing is stable (no mXSS through parse-serialize-parse) *)
157
+
let test_mxss_stability input =
158
+
match parse_and_serialize input with
159
+
| None -> (true, "parse failed") (* Parse failure is ok for malformed input *)
160
+
| Some s1 ->
161
+
match parse_and_serialize s1 with
162
+
| None -> (false, "re-parse failed")
163
+
| Some s2 ->
164
+
match parse_and_serialize s2 with
165
+
| None -> (false, "third parse failed")
166
+
| Some s3 ->
167
+
if s2 = s3 then (true, "stable")
168
+
else (false, Printf.sprintf "unstable: s2=%s s3=%s" (String.escaped s2) (String.escaped s3))
169
+
170
+
(* Test that dangerous content doesn't appear after parsing innocuous-looking input *)
171
+
let test_no_script_injection input =
172
+
if contains_script_tag input then
173
+
(* If input has script, we expect output might too *)
174
+
true
175
+
else
176
+
match parse_and_serialize input with
177
+
| None -> true
178
+
| Some output ->
179
+
if contains_script_tag output then begin
180
+
Printf.printf "SCRIPT TAG APPEARED:\n";
181
+
Printf.printf " Input: %s\n" (String.escaped input);
182
+
Printf.printf " Output: %s\n" (String.escaped output);
183
+
false
184
+
end else
185
+
true
186
+
187
+
let run_test_category name cases =
188
+
Printf.printf "--- %s ---\n" name;
189
+
let stable_count = ref 0 in
190
+
let unstable_count = ref 0 in
191
+
Array.iter (fun input ->
192
+
let (stable, msg) = test_mxss_stability input in
193
+
if stable then incr stable_count
194
+
else begin
195
+
Printf.printf "UNSTABLE: %s\n" (String.escaped (String.sub input 0 (min 60 (String.length input))));
196
+
Printf.printf " %s\n" msg;
197
+
incr unstable_count
198
+
end
199
+
) cases;
200
+
Printf.printf "%s: %d stable, %d unstable\n\n" name !stable_count !unstable_count;
201
+
!unstable_count = 0
202
+
203
+
let () =
204
+
Printf.printf "=== Security/Sanitizer Tests ===\n\n";
205
+
206
+
let all_pass = ref true in
207
+
208
+
(* Test each category for mXSS stability *)
209
+
if not (run_test_category "Basic XSS vectors" basic_xss_vectors) then
210
+
all_pass := false;
211
+
if not (run_test_category "Obfuscated XSS" obfuscated_xss) then
212
+
all_pass := false;
213
+
if not (run_test_category "mXSS patterns" mxss_patterns) then
214
+
all_pass := false;
215
+
if not (run_test_category "Attribute injection" attr_injection) then
216
+
all_pass := false;
217
+
if not (run_test_category "URL attacks" url_attacks) then
218
+
all_pass := false;
219
+
if not (run_test_category "Style attacks" style_attacks) then
220
+
all_pass := false;
221
+
if not (run_test_category "Tag soup" tag_soup) then
222
+
all_pass := false;
223
+
224
+
(* Test for script tag injection *)
225
+
Printf.printf "--- Script injection tests ---\n";
226
+
let inject_pass = ref 0 in
227
+
let inject_fail = ref 0 in
228
+
let non_script_inputs = Array.concat [attr_injection; tag_soup] in
229
+
Array.iter (fun input ->
230
+
if test_no_script_injection input then
231
+
incr inject_pass
232
+
else
233
+
incr inject_fail
234
+
) non_script_inputs;
235
+
Printf.printf "No unexpected script injection: %d/%d\n\n"
236
+
!inject_pass (!inject_pass + !inject_fail);
237
+
if !inject_fail > 0 then all_pass := false;
238
+
239
+
Printf.printf "=== Summary ===\n";
240
+
if !all_pass then
241
+
Printf.printf "All security tests passed!\n"
242
+
else begin
243
+
Printf.printf "Some security tests failed!\n";
244
+
exit 1
245
+
end
+215
fuzz/fuzz_serializer.ml
+215
fuzz/fuzz_serializer.ml
···
1
+
(* Serializer-specific fuzzer for HTML5rw
2
+
Tests serialization edge cases and formatting options *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Normalize whitespace for comparison - removes formatting differences *)
7
+
let normalize_whitespace s =
8
+
let s = Str.global_replace (Str.regexp "[\n\r\t ]+") " " s in
9
+
let s = Str.global_replace (Str.regexp "> <") "><" s in
10
+
String.trim s
11
+
12
+
(* Test serialization with different pretty-print settings *)
13
+
let test_pretty_modes input =
14
+
try
15
+
let doc = Html5rw.parse (reader_of_string input) in
16
+
17
+
let s_compact = Html5rw.to_string ~pretty:false doc in
18
+
let s_pretty = Html5rw.to_string ~pretty:true doc in
19
+
20
+
(* Both should parse back to equivalent DOMs *)
21
+
let doc_compact = Html5rw.parse (reader_of_string s_compact) in
22
+
let doc_pretty = Html5rw.parse (reader_of_string s_pretty) in
23
+
24
+
let s_compact2 = Html5rw.to_string ~pretty:false doc_compact in
25
+
let s_pretty2 = Html5rw.to_string ~pretty:false doc_pretty in
26
+
27
+
(* Compact versions should be identical (roundtrip stable) *)
28
+
if s_compact <> s_compact2 then begin
29
+
Printf.printf "Compact roundtrip mismatch:\n";
30
+
Printf.printf " s_compact: %s\n" (String.escaped s_compact);
31
+
Printf.printf " s_compact2: %s\n" (String.escaped s_compact2);
32
+
false
33
+
end else begin
34
+
(* Pretty and compact should have same semantic content (modulo whitespace) *)
35
+
let norm_compact = normalize_whitespace s_compact in
36
+
let norm_pretty2 = normalize_whitespace s_pretty2 in
37
+
if norm_compact <> norm_pretty2 then begin
38
+
Printf.printf "Pretty/compact semantic mismatch:\n";
39
+
Printf.printf " From compact: %s\n" (String.escaped norm_compact);
40
+
Printf.printf " From pretty: %s\n" (String.escaped norm_pretty2);
41
+
false
42
+
end else
43
+
true
44
+
end
45
+
with e ->
46
+
Printf.printf "Exception: %s\n" (Printexc.to_string e);
47
+
Printf.printf " Input: %s\n" (String.escaped input);
48
+
false
49
+
50
+
(* Test attribute serialization *)
51
+
let attr_test_cases = [|
52
+
(* Basic attributes *)
53
+
"<div id=\"test\"></div>";
54
+
"<div class=\"foo bar\"></div>";
55
+
"<div data-x=\"value\"></div>";
56
+
57
+
(* Quoting *)
58
+
"<div attr=\"a'b\"></div>";
59
+
"<div attr='a\"b'></div>";
60
+
"<div attr=\"a"b\"></div>";
61
+
"<div attr='a'b'></div>";
62
+
63
+
(* Special characters *)
64
+
"<div attr=\"a<b\"></div>";
65
+
"<div attr=\"a>b\"></div>";
66
+
"<div attr=\"a&b\"></div>";
67
+
"<div attr=\"a&b\"></div>";
68
+
69
+
(* Empty and valueless *)
70
+
"<div attr></div>";
71
+
"<div attr=\"\"></div>";
72
+
"<input disabled>";
73
+
"<input checked>";
74
+
75
+
(* Whitespace *)
76
+
"<div attr=\"a b\"></div>";
77
+
"<div attr=\"a\nb\"></div>";
78
+
"<div attr=\"a\tb\"></div>";
79
+
80
+
(* URLs *)
81
+
"<a href=\"http://example.com?a=1&b=2\"></a>";
82
+
"<a href=\"javascript:alert('x')\"></a>";
83
+
"<a href=\"data:text/html,<script>x</script>\"></a>";
84
+
85
+
(* Event handlers *)
86
+
"<div onclick=\"alert("x")\"></div>";
87
+
"<div onclick='alert(\"x\")'></div>";
88
+
89
+
(* Multiple attributes *)
90
+
"<div a=\"1\" b=\"2\" c=\"3\"></div>";
91
+
"<div a b c></div>";
92
+
|]
93
+
94
+
(* Test void element serialization *)
95
+
let void_test_cases = [|
96
+
"<br>";
97
+
"<br/>";
98
+
"<br />";
99
+
"<hr>";
100
+
"<img src=\"x\">";
101
+
"<input type=\"text\">";
102
+
"<meta charset=\"utf-8\">";
103
+
"<link rel=\"stylesheet\">";
104
+
"<area>";
105
+
"<base href=\"/\">";
106
+
"<col span=\"2\">";
107
+
"<embed src=\"x\">";
108
+
"<source src=\"x\">";
109
+
"<track src=\"x\">";
110
+
"<wbr>";
111
+
|]
112
+
113
+
(* Test raw text element serialization *)
114
+
(* Note: Test cases with </script> inside script are omitted because they are
115
+
intentionally invalid HTML and the parser correctly terminates at </script> *)
116
+
let rawtext_test_cases = [|
117
+
"<script>var x = 1;</script>";
118
+
"<script>var x = '<div>';</script>";
119
+
"<style>.x { color: red; }</style>";
120
+
"<textarea>Hello world</textarea>";
121
+
"<textarea><div>not an element</div></textarea>";
122
+
"<title>Page & Title</title>";
123
+
"<xmp><div>preformatted</div></xmp>";
124
+
|]
125
+
126
+
(* Test whitespace preservation *)
127
+
let whitespace_test_cases = [|
128
+
"<pre> spaces </pre>";
129
+
"<pre>\n\nlines\n\n</pre>";
130
+
"<pre>\ttabs\t</pre>";
131
+
"<code> code </code>";
132
+
"<textarea> text </textarea>";
133
+
"<div> text </div>";
134
+
"<p> text </p>";
135
+
|]
136
+
137
+
(* Test entity serialization *)
138
+
let entity_test_cases = [|
139
+
"<div>&</div>";
140
+
"<div><</div>";
141
+
"<div>></div>";
142
+
"<div>"</div>";
143
+
"<div>'</div>";
144
+
"<div> </div>";
145
+
"<div><</div>";
146
+
"<div><</div>";
147
+
"<div>©</div>";
148
+
"<div>—</div>";
149
+
|]
150
+
151
+
(* Test nested structure serialization *)
152
+
let nested_test_cases = [|
153
+
"<div><div><div></div></div></div>";
154
+
"<table><tbody><tr><td><table><tbody><tr><td></td></tr></tbody></table></td></tr></tbody></table>";
155
+
"<ul><li><ul><li><ul><li></li></ul></li></ul></li></ul>";
156
+
"<dl><dt><dl><dt></dt></dl></dt></dl>";
157
+
|]
158
+
159
+
(* Test foreign content serialization *)
160
+
let foreign_test_cases = [|
161
+
"<svg></svg>";
162
+
"<svg viewBox=\"0 0 100 100\"><circle cx=\"50\" cy=\"50\" r=\"40\"/></svg>";
163
+
"<svg><text>Hello</text></svg>";
164
+
"<math></math>";
165
+
"<math><mi>x</mi><mo>=</mo><mn>1</mn></math>";
166
+
"<svg xmlns=\"http://www.w3.org/2000/svg\"></svg>";
167
+
|]
168
+
169
+
let run_test_category name cases test_fn =
170
+
let passed = ref 0 in
171
+
let failed = ref 0 in
172
+
Array.iter (fun input ->
173
+
if test_fn input then
174
+
incr passed
175
+
else begin
176
+
Printf.printf "FAIL: %s\n" (String.escaped input);
177
+
incr failed
178
+
end
179
+
) cases;
180
+
Printf.printf "%s: %d/%d\n" name !passed (Array.length cases);
181
+
!failed = 0
182
+
183
+
let () =
184
+
let all_pass = ref true in
185
+
186
+
Printf.printf "=== Serializer Tests ===\n\n";
187
+
188
+
if not (run_test_category "Attribute serialization" attr_test_cases test_pretty_modes) then
189
+
all_pass := false;
190
+
191
+
if not (run_test_category "Void elements" void_test_cases test_pretty_modes) then
192
+
all_pass := false;
193
+
194
+
if not (run_test_category "Raw text elements" rawtext_test_cases test_pretty_modes) then
195
+
all_pass := false;
196
+
197
+
if not (run_test_category "Whitespace preservation" whitespace_test_cases test_pretty_modes) then
198
+
all_pass := false;
199
+
200
+
if not (run_test_category "Entity serialization" entity_test_cases test_pretty_modes) then
201
+
all_pass := false;
202
+
203
+
if not (run_test_category "Nested structures" nested_test_cases test_pretty_modes) then
204
+
all_pass := false;
205
+
206
+
if not (run_test_category "Foreign content" foreign_test_cases test_pretty_modes) then
207
+
all_pass := false;
208
+
209
+
Printf.printf "\n=== Summary ===\n";
210
+
if !all_pass then
211
+
Printf.printf "All serializer tests passed!\n"
212
+
else begin
213
+
Printf.printf "Some serializer tests failed!\n";
214
+
exit 1
215
+
end
+214
fuzz/fuzz_streaming.ml
+214
fuzz/fuzz_streaming.ml
···
1
+
(* Streaming/incremental fuzzer for HTML5rw
2
+
Tests that parsing produces identical results regardless of input characteristics *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Test that repeated parsing produces stable results *)
7
+
let test_stability input =
8
+
try
9
+
(* Parse multiple times and ensure consistent results *)
10
+
let doc1 = Html5rw.parse (reader_of_string input) in
11
+
let s1 = Html5rw.to_string ~pretty:false doc1 in
12
+
13
+
let doc2 = Html5rw.parse (reader_of_string input) in
14
+
let s2 = Html5rw.to_string ~pretty:false doc2 in
15
+
16
+
let doc3 = Html5rw.parse (reader_of_string input) in
17
+
let s3 = Html5rw.to_string ~pretty:false doc3 in
18
+
19
+
if s1 <> s2 || s2 <> s3 then begin
20
+
Printf.printf "PARSING NOT DETERMINISTIC:\n";
21
+
Printf.printf " S1: %s\n" (String.escaped (String.sub s1 0 (min 100 (String.length s1))));
22
+
Printf.printf " S2: %s\n" (String.escaped (String.sub s2 0 (min 100 (String.length s2))));
23
+
Printf.printf " S3: %s\n" (String.escaped (String.sub s3 0 (min 100 (String.length s3))));
24
+
false
25
+
end else
26
+
true
27
+
with e ->
28
+
Printf.printf "Exception: %s\n" (Printexc.to_string e);
29
+
Printf.printf " Input: %s\n" (String.escaped (String.sub input 0 (min 100 (String.length input))));
30
+
false
31
+
32
+
(* Test roundtrip stability *)
33
+
let test_roundtrip input =
34
+
try
35
+
let doc1 = Html5rw.parse (reader_of_string input) in
36
+
let s1 = Html5rw.to_string ~pretty:false doc1 in
37
+
let doc2 = Html5rw.parse (reader_of_string s1) in
38
+
let s2 = Html5rw.to_string ~pretty:false doc2 in
39
+
let doc3 = Html5rw.parse (reader_of_string s2) in
40
+
let s3 = Html5rw.to_string ~pretty:false doc3 in
41
+
if s2 <> s3 then begin
42
+
Printf.printf "ROUNDTRIP UNSTABLE:\n";
43
+
Printf.printf " Input: %s\n" (String.escaped (String.sub input 0 (min 50 (String.length input))));
44
+
Printf.printf " S2: %s\n" (String.escaped (String.sub s2 0 (min 100 (String.length s2))));
45
+
Printf.printf " S3: %s\n" (String.escaped (String.sub s3 0 (min 100 (String.length s3))));
46
+
false
47
+
end else
48
+
true
49
+
with e ->
50
+
Printf.printf "Exception in roundtrip: %s\n" (Printexc.to_string e);
51
+
false
52
+
53
+
(* Test cases that stress boundary handling *)
54
+
let boundary_test_cases = [|
55
+
(* Tags split at various positions *)
56
+
"<div></div>";
57
+
"<div attr=\"value\"></div>";
58
+
"<!DOCTYPE html>";
59
+
"<!-- comment -->";
60
+
61
+
(* Entity references *)
62
+
"&";
63
+
"<test>";
64
+
"<";
65
+
"<";
66
+
67
+
(* Multi-byte UTF-8 *)
68
+
"caf\xC3\xA9"; (* cafรฉ *)
69
+
"\xE6\x97\xA5\xE6\x9C\xAC\xE8\xAA\x9E"; (* ๆฅๆฌ่ช *)
70
+
"\xF0\x9F\x8E\x89"; (* ๐ *)
71
+
"<div>\xE4\xB8\xAD\xE6\x96\x87</div>";
72
+
73
+
(* Script/style content *)
74
+
"<script>var x = 1;</script>";
75
+
"<style>.x { color: red; }</style>";
76
+
77
+
(* CDATA-like in script *)
78
+
"<script>//<![CDATA[\nvar x = 1;\n//]]></script>";
79
+
80
+
(* Long strings *)
81
+
String.make 100 'x';
82
+
"<div>" ^ String.make 100 'x' ^ "</div>";
83
+
84
+
(* Many small tags *)
85
+
String.concat "" (List.init 20 (fun _ -> "<b>x</b>"));
86
+
87
+
(* Whitespace variations *)
88
+
"<div attr = 'value' ></div>";
89
+
"<pre>\n\n\ntext\n\n\n</pre>";
90
+
91
+
(* Mixed content *)
92
+
"<div>text<span>more</span>text</div>";
93
+
|]
94
+
95
+
(* Additional edge cases *)
96
+
let edge_cases = [|
97
+
(* Empty *)
98
+
"";
99
+
100
+
(* Just whitespace *)
101
+
" ";
102
+
"\n\n\n";
103
+
"\t\t\t";
104
+
105
+
(* Single characters *)
106
+
"<";
107
+
">";
108
+
"&";
109
+
"/";
110
+
111
+
(* Partial tags *)
112
+
"<d";
113
+
"<di";
114
+
"<div";
115
+
"<div>";
116
+
117
+
(* CR/LF variations *)
118
+
"<div>\r\n</div>";
119
+
"<div>\r</div>";
120
+
"<div>\n</div>";
121
+
"line1\r\nline2\rline3\nline4";
122
+
123
+
(* Multiple documents *)
124
+
"<!DOCTYPE html><html><body>x</body></html>";
125
+
|]
126
+
127
+
(* Test that pretty-printing produces valid HTML that roundtrips properly *)
128
+
let test_pretty_roundtrip input =
129
+
try
130
+
let doc = Html5rw.parse (reader_of_string input) in
131
+
let s_pretty = Html5rw.to_string ~pretty:true doc in
132
+
133
+
(* Pretty output should roundtrip-stable *)
134
+
let doc_pretty = Html5rw.parse (reader_of_string s_pretty) in
135
+
let s_pretty2 = Html5rw.to_string ~pretty:true doc_pretty in
136
+
let doc_pretty2 = Html5rw.parse (reader_of_string s_pretty2) in
137
+
let s_pretty3 = Html5rw.to_string ~pretty:true doc_pretty2 in
138
+
139
+
if s_pretty2 <> s_pretty3 then begin
140
+
Printf.printf "PRETTY ROUNDTRIP UNSTABLE:\n";
141
+
Printf.printf " S2: %s\n" (String.escaped (String.sub s_pretty2 0 (min 100 (String.length s_pretty2))));
142
+
Printf.printf " S3: %s\n" (String.escaped (String.sub s_pretty3 0 (min 100 (String.length s_pretty3))));
143
+
false
144
+
end else
145
+
true
146
+
with e ->
147
+
Printf.printf "Exception: %s\n" (Printexc.to_string e);
148
+
false
149
+
150
+
(* Run all tests *)
151
+
let run_all_tests () =
152
+
let test_cases = Array.concat [boundary_test_cases; edge_cases] in
153
+
let all_pass = ref true in
154
+
155
+
Printf.printf "=== Streaming/Stability Tests ===\n\n";
156
+
157
+
(* Test parsing stability *)
158
+
Printf.printf "--- Parsing stability ---\n";
159
+
let stable_pass = ref 0 in
160
+
let stable_fail = ref 0 in
161
+
Array.iter (fun input ->
162
+
if test_stability input then
163
+
incr stable_pass
164
+
else
165
+
incr stable_fail
166
+
) test_cases;
167
+
Printf.printf "Parsing stability: %d/%d\n" !stable_pass (Array.length test_cases);
168
+
if !stable_fail > 0 then all_pass := false;
169
+
170
+
(* Test roundtrip stability *)
171
+
Printf.printf "\n--- Roundtrip stability ---\n";
172
+
let rt_pass = ref 0 in
173
+
let rt_fail = ref 0 in
174
+
Array.iter (fun input ->
175
+
if test_roundtrip input then
176
+
incr rt_pass
177
+
else
178
+
incr rt_fail
179
+
) test_cases;
180
+
Printf.printf "Roundtrip stability: %d/%d\n" !rt_pass (Array.length test_cases);
181
+
if !rt_fail > 0 then all_pass := false;
182
+
183
+
(* Test pretty printing roundtrip stability *)
184
+
Printf.printf "\n--- Pretty printing roundtrip ---\n";
185
+
let pretty_pass = ref 0 in
186
+
let pretty_fail = ref 0 in
187
+
Array.iter (fun input ->
188
+
if test_pretty_roundtrip input then
189
+
incr pretty_pass
190
+
else
191
+
incr pretty_fail
192
+
) test_cases;
193
+
Printf.printf "Pretty roundtrip: %d/%d\n" !pretty_pass (Array.length test_cases);
194
+
if !pretty_fail > 0 then all_pass := false;
195
+
196
+
Printf.printf "\n=== Summary ===\n";
197
+
if !all_pass then
198
+
Printf.printf "All streaming/stability tests passed!\n"
199
+
else begin
200
+
Printf.printf "Some tests failed!\n";
201
+
exit 1
202
+
end
203
+
204
+
(* AFL entry point for fuzz testing *)
205
+
let fuzz_mode () =
206
+
let input = In_channel.input_all In_channel.stdin in
207
+
if not (test_stability input && test_roundtrip input) then
208
+
exit 1
209
+
210
+
let () =
211
+
if Array.length Sys.argv > 1 && Sys.argv.(1) = "--fuzz" then
212
+
fuzz_mode ()
213
+
else
214
+
run_all_tests ()
+176
fuzz/fuzz_structure.ml
+176
fuzz/fuzz_structure.ml
···
1
+
(* Structure-aware HTML fuzzer
2
+
Generates and mutates syntactically plausible HTML to find edge cases *)
3
+
4
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
5
+
6
+
(* Common HTML elements for generation *)
7
+
let void_elements = [| "br"; "hr"; "img"; "input"; "meta"; "link"; "area"; "base"; "col"; "embed"; "source"; "track"; "wbr" |]
8
+
let block_elements = [| "div"; "p"; "h1"; "h2"; "h3"; "section"; "article"; "header"; "footer"; "main"; "nav"; "aside"; "blockquote"; "pre"; "ul"; "ol"; "li"; "dl"; "dt"; "dd"; "figure"; "figcaption"; "table"; "form"; "fieldset" |]
9
+
let inline_elements = [| "span"; "a"; "em"; "strong"; "b"; "i"; "u"; "s"; "small"; "big"; "code"; "kbd"; "var"; "samp"; "cite"; "q"; "abbr"; "time"; "mark"; "sub"; "sup" |]
10
+
(* Formatting elements for adoption agency algorithm testing *)
11
+
let _formatting_elements = [| "a"; "b"; "big"; "code"; "em"; "font"; "i"; "nobr"; "s"; "small"; "strike"; "strong"; "tt"; "u" |]
12
+
let table_elements = [| "table"; "thead"; "tbody"; "tfoot"; "tr"; "th"; "td"; "caption"; "colgroup"; "col" |]
13
+
let special_elements = [| "script"; "style"; "template"; "svg"; "math"; "textarea"; "title"; "noscript"; "iframe"; "xmp"; "plaintext" |]
14
+
15
+
let all_elements = Array.concat [void_elements; block_elements; inline_elements; table_elements; special_elements]
16
+
17
+
(* Random selection *)
18
+
let pick arr = arr.(Random.int (Array.length arr))
19
+
20
+
(* Generate random attribute *)
21
+
let gen_attr_name () =
22
+
let names = [| "id"; "class"; "style"; "href"; "src"; "alt"; "title"; "name"; "value"; "type"; "data-x"; "aria-label"; "onclick"; "onload" |] in
23
+
pick names
24
+
25
+
let gen_attr_value () =
26
+
let values = [| ""; "x"; "test"; "foo bar"; "a\"b"; "a'b"; "a<b"; "a>b"; "a&b"; "<script>"; "javascript:"; "�"; "\x00"; "\n\t" |] in
27
+
pick values
28
+
29
+
let gen_attrs n =
30
+
let buf = Buffer.create 64 in
31
+
for _ = 1 to n do
32
+
Buffer.add_char buf ' ';
33
+
Buffer.add_string buf (gen_attr_name ());
34
+
if Random.bool () then begin
35
+
Buffer.add_string buf "=\"";
36
+
Buffer.add_string buf (gen_attr_value ());
37
+
Buffer.add_char buf '"'
38
+
end
39
+
done;
40
+
Buffer.contents buf
41
+
42
+
(* Generate random HTML *)
43
+
let rec gen_html depth max_depth =
44
+
if depth >= max_depth then
45
+
(* Terminal: text or void element *)
46
+
if Random.bool () then
47
+
let texts = [| "hello"; "world"; "<text>"; "&"; ""; " "; "\n" |] in
48
+
pick texts
49
+
else
50
+
"<" ^ pick void_elements ^ gen_attrs (Random.int 3) ^ ">"
51
+
else
52
+
let tag = pick all_elements in
53
+
let attrs = gen_attrs (Random.int 4) in
54
+
let is_void = Array.mem tag void_elements in
55
+
if is_void then
56
+
"<" ^ tag ^ attrs ^ ">"
57
+
else
58
+
let children = Buffer.create 256 in
59
+
let num_children = Random.int 5 in
60
+
for _ = 1 to num_children do
61
+
Buffer.add_string children (gen_html (depth + 1) max_depth)
62
+
done;
63
+
"<" ^ tag ^ attrs ^ ">" ^ Buffer.contents children ^ "</" ^ tag ^ ">"
64
+
65
+
(* Mutation strategies *)
66
+
type mutation =
67
+
| DeleteChar of int
68
+
| InsertChar of int * char
69
+
| SwapChars of int * int
70
+
| DuplicateRange of int * int
71
+
| CorruptTag of int
72
+
| UnclosedTag of int
73
+
| MisnestedTags
74
+
| InsertNullByte of int
75
+
| TruncateAt of int
76
+
77
+
let apply_mutation input mutation =
78
+
let len = String.length input in
79
+
if len = 0 then input else
80
+
match mutation with
81
+
| DeleteChar i when i < len ->
82
+
String.sub input 0 i ^ String.sub input (i + 1) (len - i - 1)
83
+
| InsertChar (i, c) when i <= len ->
84
+
String.sub input 0 i ^ String.make 1 c ^ String.sub input i (len - i)
85
+
| SwapChars (i, j) when i < len && j < len ->
86
+
let bytes = Bytes.of_string input in
87
+
let tmp = Bytes.get bytes i in
88
+
Bytes.set bytes i (Bytes.get bytes j);
89
+
Bytes.set bytes j tmp;
90
+
Bytes.to_string bytes
91
+
| DuplicateRange (start, len') when start < len && start + len' <= len ->
92
+
let range = String.sub input start len' in
93
+
String.sub input 0 start ^ range ^ range ^ String.sub input (start + len') (len - start - len')
94
+
| CorruptTag i ->
95
+
(* Find a < after position i and corrupt the tag *)
96
+
(try
97
+
let tag_start = String.index_from input (min i (len - 1)) '<' in
98
+
String.sub input 0 (tag_start + 1) ^ "\x00" ^ String.sub input (tag_start + 1) (len - tag_start - 1)
99
+
with Not_found -> input)
100
+
| UnclosedTag i ->
101
+
(* Find a </ after position i and remove it *)
102
+
(try
103
+
let close_start = Str.search_forward (Str.regexp "</") input (min i (len - 1)) in
104
+
let close_end = String.index_from input close_start '>' in
105
+
String.sub input 0 close_start ^ String.sub input (close_end + 1) (len - close_end - 1)
106
+
with Not_found -> input)
107
+
| MisnestedTags ->
108
+
(* Generate misnested tags *)
109
+
let tags = [| "a"; "b"; "i"; "em"; "strong"; "span"; "div"; "p" |] in
110
+
let t1, t2 = pick tags, pick tags in
111
+
input ^ "<" ^ t1 ^ "><" ^ t2 ^ "></" ^ t1 ^ "></" ^ t2 ^ ">"
112
+
| InsertNullByte i when i < len ->
113
+
String.sub input 0 i ^ "\x00" ^ String.sub input i (len - i)
114
+
| TruncateAt i when i < len ->
115
+
String.sub input 0 i
116
+
| _ -> input
117
+
118
+
let random_mutation input =
119
+
let len = String.length input in
120
+
let mutations = [|
121
+
DeleteChar (Random.int (max 1 len));
122
+
InsertChar (Random.int (len + 1), Char.chr (Random.int 256));
123
+
SwapChars (Random.int (max 1 len), Random.int (max 1 len));
124
+
DuplicateRange (Random.int (max 1 len), Random.int (min 50 (max 1 len)));
125
+
CorruptTag (Random.int (max 1 len));
126
+
UnclosedTag (Random.int (max 1 len));
127
+
MisnestedTags;
128
+
InsertNullByte (Random.int (max 1 len));
129
+
TruncateAt (Random.int (max 1 len));
130
+
|] in
131
+
apply_mutation input (pick mutations)
132
+
133
+
(* Test function: parse, serialize, and check for crashes/hangs *)
134
+
let test_html input =
135
+
try
136
+
let r1 = Html5rw.parse (reader_of_string input) in
137
+
let s1 = Html5rw.to_string ~pretty:false r1 in
138
+
let r2 = Html5rw.parse (reader_of_string s1) in
139
+
let s2 = Html5rw.to_string ~pretty:false r2 in
140
+
let r3 = Html5rw.parse (reader_of_string s2) in
141
+
let s3 = Html5rw.to_string ~pretty:false r3 in
142
+
if s2 <> s3 then begin
143
+
Printf.printf "ROUNDTRIP FAILED:\n";
144
+
Printf.printf "Input: %s\n" (String.escaped (String.sub input 0 (min 200 (String.length input))));
145
+
Printf.printf "s2: %s\n" (String.escaped (String.sub s2 0 (min 200 (String.length s2))));
146
+
Printf.printf "s3: %s\n" (String.escaped (String.sub s3 0 (min 200 (String.length s3))));
147
+
false
148
+
end else
149
+
true
150
+
with e ->
151
+
Printf.printf "EXCEPTION: %s\n" (Printexc.to_string e);
152
+
Printf.printf "Input: %s\n" (String.escaped (String.sub input 0 (min 200 (String.length input))));
153
+
false
154
+
155
+
(* Main fuzzing loop *)
156
+
let () =
157
+
Random.self_init ();
158
+
159
+
(* Mode: generate or mutate based on stdin *)
160
+
let input = In_channel.input_all In_channel.stdin in
161
+
162
+
let test_input =
163
+
if String.length input < 10 then
164
+
(* Generate random HTML *)
165
+
gen_html 0 (3 + Random.int 5)
166
+
else
167
+
(* Mutate the input *)
168
+
let mutated = ref input in
169
+
for _ = 1 to 1 + Random.int 5 do
170
+
mutated := random_mutation !mutated
171
+
done;
172
+
!mutated
173
+
in
174
+
175
+
if not (test_html test_input) then
176
+
exit 1
+58
fuzz/test_crash.ml
+58
fuzz/test_crash.ml
···
1
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
2
+
let serialize result = Html5rw.to_string ~pretty:false result
3
+
4
+
let rec dump_node indent (node : Html5rw.Dom.node) =
5
+
let padding = String.make (indent * 2) ' ' in
6
+
Printf.printf "%s[%s]" padding (String.escaped node.name);
7
+
(match node.namespace with Some ns -> Printf.printf " ns=%s" ns | None -> ());
8
+
if node.attrs <> [] then begin
9
+
Printf.printf " attrs=%d" (List.length node.attrs)
10
+
end;
11
+
Printf.printf "\n";
12
+
List.iter (dump_node (indent + 1)) node.children
13
+
14
+
let () =
15
+
let input = In_channel.input_all (In_channel.open_bin Sys.argv.(1)) in
16
+
let r1 = Html5rw.parse (reader_of_string input) in
17
+
let s1 = serialize r1 in
18
+
Printf.printf "=== After 1st parse ===\n";
19
+
dump_node 0 (Html5rw.root r1);
20
+
Printf.printf "\ns1 (%d): %s\n\n" (String.length s1) (String.escaped (String.sub s1 0 (min 200 (String.length s1))));
21
+
22
+
let r2 = Html5rw.parse (reader_of_string s1) in
23
+
let s2 = serialize r2 in
24
+
Printf.printf "=== After 2nd parse ===\n";
25
+
dump_node 0 (Html5rw.root r2);
26
+
Printf.printf "\ns2 (%d): %s\n\n" (String.length s2) (String.escaped (String.sub s2 0 (min 200 (String.length s2))));
27
+
28
+
let r3 = Html5rw.parse (reader_of_string s2) in
29
+
let s3 = serialize r3 in
30
+
Printf.printf "=== After 3rd parse ===\n";
31
+
dump_node 0 (Html5rw.root r3);
32
+
Printf.printf "\ns3 (%d): %s\n\n" (String.length s3) (String.escaped (String.sub s3 0 (min 200 (String.length s3))));
33
+
34
+
Printf.printf "=== FULL s2 ===\n%s\n\n" (String.escaped s2);
35
+
Printf.printf "=== FULL s3 ===\n%s\n\n" (String.escaped s3);
36
+
37
+
if s2 = s3 then
38
+
Printf.printf "ROUNDTRIP OK\n"
39
+
else begin
40
+
Printf.printf "ROUNDTRIP FAILED - finding first difference:\n";
41
+
let min_len = min (String.length s2) (String.length s3) in
42
+
let rec find_diff i =
43
+
if i >= min_len then
44
+
Printf.printf "Strings differ in length: s2=%d, s3=%d\n" (String.length s2) (String.length s3)
45
+
else if s2.[i] <> s3.[i] then begin
46
+
Printf.printf "First diff at position %d: s2[%d]='%s' vs s3[%d]='%s'\n"
47
+
i i (String.escaped (String.make 1 s2.[i])) i (String.escaped (String.make 1 s3.[i]));
48
+
Printf.printf "Context around diff:\n";
49
+
let start = max 0 (i - 30) in
50
+
let end_s2 = min (String.length s2) (i + 50) in
51
+
let end_s3 = min (String.length s3) (i + 50) in
52
+
Printf.printf "s2[%d..%d]: %s\n" start end_s2 (String.escaped (String.sub s2 start (end_s2 - start)));
53
+
Printf.printf "s3[%d..%d]: %s\n" start end_s3 (String.escaped (String.sub s3 start (end_s3 - start)));
54
+
end
55
+
else find_diff (i + 1)
56
+
in
57
+
find_diff 0
58
+
end
+17
fuzz/test_pre.ml
+17
fuzz/test_pre.ml
···
1
+
let reader_of_string s = Bytesrw.Bytes.Reader.of_string s
2
+
3
+
let rec dump_node indent (node : Html5rw.Dom.node) =
4
+
let padding = String.make (indent * 2) ' ' in
5
+
Printf.printf "%s%s" padding node.name;
6
+
(match node.data with
7
+
| "" -> ()
8
+
| d -> Printf.printf " data=%S" d);
9
+
Printf.printf "\n";
10
+
List.iter (dump_node (indent + 1)) node.children
11
+
12
+
let () =
13
+
let input = "<pre><div>\n</div></pre>" in
14
+
Printf.printf "Input: %s\n" (String.escaped input);
15
+
let r1 = Html5rw.parse (reader_of_string input) in
16
+
Printf.printf "DOM:\n";
17
+
dump_node 0 (Html5rw.root r1)
+35
html5rw-js.opam
+35
html5rw-js.opam
···
1
+
# This file is generated by dune, edit dune-project instead
2
+
opam-version: "2.0"
3
+
synopsis: "Browser-based HTML5 parser via js_of_ocaml/wasm_of_ocaml"
4
+
description:
5
+
"JavaScript and WebAssembly builds of the html5rw HTML5 parser for browser use. Includes a main validator library, web worker for background validation, and browser-based test runner."
6
+
maintainer: ["Anil Madhavapeddy <anil@recoil.org>"]
7
+
authors: ["Anil Madhavapeddy <anil@recoil.org>"]
8
+
license: "MIT"
9
+
homepage: "https://tangled.org/@anil.recoil.org/ocaml-html5rw"
10
+
bug-reports: "https://tangled.org/@anil.recoil.org/ocaml-html5rw/issues"
11
+
depends: [
12
+
"dune" {>= "3.20"}
13
+
"ocaml" {>= "5.1.0"}
14
+
"html5rw" {= version}
15
+
"js_of_ocaml" {>= "5.0"}
16
+
"js_of_ocaml-ppx" {>= "5.0"}
17
+
"wasm_of_ocaml-compiler" {>= "5.0"}
18
+
"brr" {>= "0.0.6"}
19
+
"odoc" {with-doc}
20
+
]
21
+
build: [
22
+
["dune" "subst"] {dev}
23
+
[
24
+
"dune"
25
+
"build"
26
+
"-p"
27
+
name
28
+
"-j"
29
+
jobs
30
+
"@install"
31
+
"@runtest" {with-test}
32
+
"@doc" {with-doc}
33
+
]
34
+
]
35
+
x-maintenance-intent: ["(latest)"]
+3
-4
html5rw.opam
+3
-4
html5rw.opam
···
6
6
maintainer: ["Anil Madhavapeddy <anil@recoil.org>"]
7
7
authors: ["Anil Madhavapeddy <anil@recoil.org>"]
8
8
license: "MIT"
9
-
homepage: "https://tangled.org/anil.recoil.org/ocaml-html5rw"
10
-
bug-reports: "https://tangled.org/anil.recoil.org/ocaml-html5rw/issues"
9
+
homepage: "https://tangled.org/@anil.recoil.org/ocaml-html5rw"
10
+
bug-reports: "https://tangled.org/@anil.recoil.org/ocaml-html5rw/issues"
11
11
depends: [
12
-
"dune" {>= "3.21"}
12
+
"dune" {>= "3.20"}
13
13
"ocaml" {>= "5.1.0"}
14
14
"astring" {>= "0.8.5"}
15
15
"bytesrw" {>= "0.3.0"}
···
36
36
"@doc" {with-doc}
37
37
]
38
38
]
39
-
dev-repo: "git+https://tangled.org/anil.recoil.org/ocaml-html5rw"
40
39
x-maintenance-intent: ["(latest)"]
+7
-2
lib/html5rw/dom/dom.ml
+7
-2
lib/html5rw/dom/dom.ml
···
12
12
13
13
include Dom_node
14
14
15
-
let to_html = Dom_serialize.to_html
16
-
let to_writer = Dom_serialize.to_writer
15
+
(* Wrap serialization functions to hide internal text_mode parameter *)
16
+
let to_html ?pretty ?indent_size ?indent node =
17
+
Dom_serialize.to_html ?pretty ?indent_size ?indent node
18
+
19
+
let to_writer ?pretty ?indent_size ?indent w node =
20
+
Dom_serialize.to_writer ?pretty ?indent_size ?indent w node
21
+
17
22
let to_test_format = Dom_serialize.to_test_format
18
23
let to_text = Dom_serialize.to_text
+571
-84
lib/html5rw/dom/dom_serialize.ml
+571
-84
lib/html5rw/dom/dom_serialize.ml
···
20
20
21
21
let is_void name = Hashtbl.mem void_elements_tbl name
22
22
23
+
(* Raw text elements - content should NOT be escaped at all
24
+
Per WHATWG spec: script, style, xmp, iframe, noembed, noframes
25
+
Note: noscript depends on scripting being enabled (we assume it is)
26
+
Note: plaintext is handled specially - it has no closing tag *)
27
+
let raw_text_elements_tbl =
28
+
let elements = [
29
+
"script"; "style"; "xmp"; "iframe"; "noembed"; "noframes"; "noscript"
30
+
] in
31
+
let tbl = Hashtbl.create (List.length elements) in
32
+
List.iter (fun e -> Hashtbl.add tbl e ()) elements;
33
+
tbl
34
+
35
+
let is_raw_text_element name = Hashtbl.mem raw_text_elements_tbl name
36
+
37
+
(* plaintext is special: it can never be closed, everything after is raw text.
38
+
We treat it as raw text but without a closing tag. *)
39
+
let is_plaintext_element name = name = "plaintext"
40
+
41
+
(* Escapable raw text elements - only & needs to be escaped *)
42
+
let escapable_raw_text_elements_tbl =
43
+
let elements = ["textarea"; "title"] in
44
+
let tbl = Hashtbl.create (List.length elements) in
45
+
List.iter (fun e -> Hashtbl.add tbl e ()) elements;
46
+
tbl
47
+
48
+
let is_escapable_raw_text_element name = Hashtbl.mem escapable_raw_text_elements_tbl name
49
+
50
+
(* HTML breakout elements - these break out of foreign content (SVG/MathML) when parsed.
51
+
Per WHATWG spec section 13.2.6.5, these start tags cause exit from foreign content. *)
52
+
let html_breakout_elements_tbl =
53
+
let elements = [
54
+
"b"; "big"; "blockquote"; "body"; "br"; "center"; "code"; "dd"; "div"; "dl"; "dt";
55
+
"em"; "embed"; "h1"; "h2"; "h3"; "h4"; "h5"; "h6"; "head"; "hr"; "i"; "img"; "li";
56
+
"listing"; "menu"; "meta"; "nobr"; "ol"; "p"; "pre"; "ruby"; "s"; "small"; "span";
57
+
"strong"; "strike"; "sub"; "sup"; "table"; "tt"; "u"; "ul"; "var"
58
+
] in
59
+
let tbl = Hashtbl.create (List.length elements) in
60
+
List.iter (fun e -> Hashtbl.add tbl e ()) elements;
61
+
tbl
62
+
63
+
let is_html_breakout_element name = Hashtbl.mem html_breakout_elements_tbl (String.lowercase_ascii name)
64
+
65
+
(* HTML integration points in SVG - these allow HTML content inside SVG *)
66
+
let is_svg_html_integration_point name =
67
+
let name = String.lowercase_ascii name in
68
+
name = "foreignobject" || name = "desc" || name = "title"
69
+
70
+
(* Formatting elements - these are in the list of active formatting elements
71
+
and the adoption agency algorithm handles them specially when block elements appear *)
72
+
let formatting_elements_tbl =
73
+
let elements = ["a"; "b"; "big"; "code"; "em"; "font"; "i"; "nobr"; "s"; "small"; "strike"; "strong"; "tt"; "u"] in
74
+
let tbl = Hashtbl.create (List.length elements) in
75
+
List.iter (fun e -> Hashtbl.add tbl e ()) elements;
76
+
tbl
77
+
78
+
let is_formatting_element name = Hashtbl.mem formatting_elements_tbl (String.lowercase_ascii name)
79
+
80
+
(* Block elements that trigger adoption agency when inside formatting elements *)
81
+
let is_block_element name =
82
+
let name = String.lowercase_ascii name in
83
+
List.mem name ["div"; "p"; "h1"; "h2"; "h3"; "h4"; "h5"; "h6"; "blockquote"; "pre"; "ol"; "ul"; "dl";
84
+
"table"; "form"; "fieldset"; "address"; "article"; "aside"; "footer"; "header"; "main";
85
+
"nav"; "section"; "figure"; "figcaption"; "details"; "summary"]
86
+
87
+
(* Elements where a leading newline in content must be doubled during serialization.
88
+
Per HTML5 spec, the parser strips a single leading newline after opening tags
89
+
for pre, textarea, and listing elements. To preserve content, we must emit
90
+
an extra newline if the content starts with one. *)
91
+
let needs_leading_newline_preserved name =
92
+
name = "pre" || name = "textarea" || name = "listing"
93
+
94
+
(* Check if text content starts with a newline (LF) *)
95
+
let starts_with_newline text =
96
+
String.length text > 0 && text.[0] = '\n'
97
+
98
+
(* Get the first text content from children, if any *)
99
+
let first_text_content children =
100
+
match children with
101
+
| [] -> ""
102
+
| first :: _ when first.name = "#text" -> first.data
103
+
| _ -> ""
104
+
23
105
(* Foreign attribute adjustments for test output *)
24
106
let foreign_attr_adjustments = [
25
107
"xlink:actuate"; "xlink:arcrole"; "xlink:href"; "xlink:role";
···
39
121
) text;
40
122
Buffer.contents buf
41
123
124
+
(* Escape text for escapable raw text elements (only & needs escaping) *)
125
+
let escape_escapable_raw_text text =
126
+
let buf = Buffer.create (String.length text) in
127
+
String.iter (fun c ->
128
+
match c with
129
+
| '&' -> Buffer.add_string buf "&"
130
+
| c -> Buffer.add_char buf c
131
+
) text;
132
+
Buffer.contents buf
133
+
42
134
(* Choose quote character for attribute value *)
43
135
let choose_attr_quote value =
44
136
if String.contains value '"' && not (String.contains value '\'') then '\''
45
137
else '"'
46
138
47
-
(* Escape attribute value *)
139
+
(* Escape attribute value - must escape &, quotes, and < for safe reparsing *)
48
140
let escape_attr_value value quote_char =
49
141
let buf = Buffer.create (String.length value) in
50
142
String.iter (fun c ->
51
143
match c with
52
144
| '&' -> Buffer.add_string buf "&"
145
+
| '<' -> Buffer.add_string buf "<"
53
146
| '"' when quote_char = '"' -> Buffer.add_string buf """
54
147
| '\'' when quote_char = '\'' -> Buffer.add_string buf "'"
55
148
| c -> Buffer.add_char buf c
···
68
161
) value;
69
162
not !invalid
70
163
71
-
(* Serialize start tag - per WHATWG spec, attribute values must be quoted *)
164
+
(* Check if a name is valid for serialization - rejects control chars,
165
+
whitespace, and special chars like quotes, angle brackets, slash, equals *)
166
+
let is_valid_name ?(allow_lt=false) name =
167
+
if String.length name = 0 then false
168
+
else
169
+
let valid = ref true in
170
+
String.iter (fun c ->
171
+
let code = Char.code c in
172
+
if code <= 0x1F || (code >= 0x7F && code <= 0x9F) ||
173
+
c = ' ' || c = '\t' || c = '\n' || c = '\x0C' || c = '\r' ||
174
+
c = '"' || c = '\'' || c = '>' || c = '/' || c = '=' ||
175
+
(c = '<' && not allow_lt) then
176
+
valid := false
177
+
) name;
178
+
!valid
179
+
180
+
let is_valid_attr_name = is_valid_name ~allow_lt:false
181
+
182
+
(* Element names must be ASCII-only for consistent roundtrip parsing *)
183
+
let is_valid_element_name name =
184
+
if String.length name = 0 then false
185
+
else
186
+
let valid = ref true in
187
+
String.iter (fun c ->
188
+
let code = Char.code c in
189
+
(* Reject all non-ASCII and special chars *)
190
+
if code < 0x21 || code > 0x7E ||
191
+
c = '"' || c = '\'' || c = '>' || c = '/' || c = '=' || c = '<' then
192
+
valid := false
193
+
) name;
194
+
!valid
195
+
196
+
(* Sanitize element name by removing invalid characters.
197
+
Returns a safe element name for serialization.
198
+
Only keeps printable ASCII chars excluding special HTML chars. *)
199
+
let sanitize_element_name name =
200
+
if is_valid_element_name name then name
201
+
else begin
202
+
let buf = Buffer.create (String.length name) in
203
+
String.iter (fun c ->
204
+
let code = Char.code c in
205
+
(* Keep only printable ASCII excluding special chars *)
206
+
if code >= 0x21 && code <= 0x7E &&
207
+
c <> '"' && c <> '\'' && c <> '>' && c <> '/' && c <> '=' && c <> '<' then
208
+
Buffer.add_char buf c
209
+
) name;
210
+
let sanitized = Buffer.contents buf in
211
+
if String.length sanitized = 0 then "span" else sanitized
212
+
end
213
+
214
+
(* Serialize start tag - per WHATWG spec, attribute values must be quoted.
215
+
Attributes with invalid names are skipped to ensure valid HTML output. *)
72
216
let serialize_start_tag name attrs =
73
217
let buf = Buffer.create 64 in
74
218
Buffer.add_char buf '<';
75
219
Buffer.add_string buf name;
76
220
List.iter (fun (key, value) ->
77
-
Buffer.add_char buf ' ';
78
-
Buffer.add_string buf key;
79
-
if value <> "" then begin
80
-
(* WHATWG serialization algorithm requires double quotes around values *)
81
-
Buffer.add_char buf '=';
82
-
Buffer.add_char buf '"';
83
-
Buffer.add_string buf (escape_attr_value value '"');
84
-
Buffer.add_char buf '"'
221
+
(* Skip attributes with invalid names - they can't be serialized safely *)
222
+
if is_valid_attr_name key then begin
223
+
Buffer.add_char buf ' ';
224
+
Buffer.add_string buf key;
225
+
if value <> "" then begin
226
+
(* WHATWG serialization algorithm requires double quotes around values *)
227
+
Buffer.add_char buf '=';
228
+
Buffer.add_char buf '"';
229
+
Buffer.add_string buf (escape_attr_value value '"');
230
+
Buffer.add_char buf '"'
231
+
end
85
232
end
86
233
) attrs;
87
234
Buffer.add_char buf '>';
···
91
238
let serialize_end_tag name =
92
239
"</" ^ name ^ ">"
93
240
94
-
(* Convert node to HTML string *)
95
-
let rec to_html ?(pretty=true) ?(indent_size=2) ?(indent=0) node =
241
+
(* Text escaping mode based on parent element *)
242
+
type text_mode = Normal | Raw | EscapableRaw
243
+
244
+
(* Foreign content context for tracking SVG/MathML during serialization *)
245
+
type foreign_ctx = NotForeign | InSvg | InMathML
246
+
247
+
(* Serialization context for tracking state during tree traversal *)
248
+
type serial_ctx = {
249
+
mutable open_formatting: string list; (* Stack of open formatting element names *)
250
+
mutable in_foreign: foreign_ctx; (* Current foreign content context *)
251
+
mutable foreign_depth: int; (* Depth inside foreign content *)
252
+
}
253
+
254
+
let create_ctx () = {
255
+
open_formatting = [];
256
+
in_foreign = NotForeign;
257
+
foreign_depth = 0;
258
+
}
259
+
260
+
(* Check if a formatting element is already open in the context *)
261
+
let has_open_formatting ctx name =
262
+
List.mem (String.lowercase_ascii name) (List.map String.lowercase_ascii ctx.open_formatting)
263
+
264
+
(* Table elements that need implicit wrappers *)
265
+
let table_cell_elements = ["td"; "th"]
266
+
let table_row_elements = ["tr"]
267
+
let table_section_elements = ["tbody"; "thead"; "tfoot"]
268
+
269
+
(* Check if we need to add implicit table wrappers *)
270
+
let needs_tbody_wrapper parent_name children =
271
+
String.lowercase_ascii parent_name = "table" &&
272
+
List.exists (fun c ->
273
+
let n = String.lowercase_ascii c.name in
274
+
List.mem n table_row_elements || List.mem n table_cell_elements
275
+
) children
276
+
277
+
(* Check if a table has any real table content (not just comments/text that would be foster-parented) *)
278
+
let table_has_real_content children =
279
+
List.exists (fun c ->
280
+
let n = String.lowercase_ascii c.name in
281
+
List.mem n table_section_elements ||
282
+
List.mem n table_row_elements ||
283
+
List.mem n table_cell_elements ||
284
+
n = "caption" || n = "colgroup" || n = "col"
285
+
) children
286
+
287
+
(* Check if this is an empty table that would cause foster parenting instability *)
288
+
let is_empty_table name children =
289
+
String.lowercase_ascii name = "table" && not (table_has_real_content children)
290
+
291
+
(* Structural elements that have special parsing behavior and cause instability
292
+
when nested inside other elements. These should have their content output
293
+
directly without the wrapper element when found in unexpected contexts. *)
294
+
let is_structural_element name =
295
+
let name = String.lowercase_ascii name in
296
+
name = "body" || name = "head" || name = "html"
297
+
298
+
(* Convert node to HTML string
299
+
Returns (html_string, encountered_plaintext) where encountered_plaintext
300
+
indicates that a plaintext element was found and no more content should
301
+
be serialized after this point (plaintext absorbs everything after it)
302
+
303
+
The in_foreign parameter tracks whether we're inside SVG or MathML foreign
304
+
content. When in foreign content, HTML breakout elements need special handling
305
+
to ensure roundtrip stability.
306
+
307
+
The ctx parameter tracks serialization state for adoption agency handling. *)
308
+
let rec to_html_internal ?(pretty=true) ?(indent_size=2) ?(indent=0) ?(text_mode=Normal) ?(in_foreign=NotForeign) ?(ctx=None) node =
309
+
let ctx = match ctx with Some c -> c | None -> create_ctx () in
96
310
let prefix = if pretty then String.make (indent * indent_size) ' ' else "" in
97
311
let newline = if pretty then "\n" else "" in
98
312
313
+
(* Escape text based on mode *)
314
+
let escape_for_mode text = match text_mode with
315
+
| Normal -> escape_text text
316
+
| Raw -> text (* No escaping for script/style content *)
317
+
| EscapableRaw -> escape_escapable_raw_text text
318
+
in
319
+
99
320
match node.name with
100
321
| "#document" ->
101
-
let parts = List.map (to_html ~pretty ~indent_size ~indent:0) node.children in
102
-
String.concat newline (List.filter (fun s -> s <> "") parts)
322
+
let buf = Buffer.create 256 in
323
+
let first = ref true in
324
+
let plaintext_found = ref false in
325
+
List.iter (fun child ->
326
+
if not !plaintext_found then begin
327
+
let (html, pt) = to_html_internal ~pretty ~indent_size ~indent:0 ~text_mode:Normal ~in_foreign:NotForeign ~ctx:(Some ctx) child in
328
+
if html <> "" then begin
329
+
if not !first && pretty then Buffer.add_string buf newline;
330
+
Buffer.add_string buf html;
331
+
first := false
332
+
end;
333
+
if pt then plaintext_found := true
334
+
end
335
+
) node.children;
336
+
(Buffer.contents buf, !plaintext_found)
103
337
104
338
| "#document-fragment" ->
105
-
let parts = List.map (to_html ~pretty ~indent_size ~indent) node.children in
106
-
String.concat newline (List.filter (fun s -> s <> "") parts)
339
+
let buf = Buffer.create 256 in
340
+
let first = ref true in
341
+
let plaintext_found = ref false in
342
+
List.iter (fun child ->
343
+
if not !plaintext_found then begin
344
+
let (html, pt) = to_html_internal ~pretty ~indent_size ~indent ~text_mode ~in_foreign ~ctx:(Some ctx) child in
345
+
if html <> "" then begin
346
+
if not !first && pretty then Buffer.add_string buf newline;
347
+
Buffer.add_string buf html;
348
+
first := false
349
+
end;
350
+
if pt then plaintext_found := true
351
+
end
352
+
) node.children;
353
+
(Buffer.contents buf, !plaintext_found)
107
354
108
355
| "#text" ->
109
356
let text = node.data in
110
-
if pretty then
357
+
if pretty && text_mode = Normal then
111
358
let trimmed = String.trim text in
112
-
if trimmed = "" then ""
113
-
else prefix ^ escape_text trimmed
114
-
else escape_text text
359
+
if trimmed = "" then ("", false)
360
+
else (prefix ^ escape_for_mode trimmed, false)
361
+
else (escape_for_mode text, false)
115
362
116
363
| "#comment" ->
117
-
prefix ^ "<!--" ^ node.data ^ "-->"
364
+
(prefix ^ "<!--" ^ node.data ^ "-->", false)
118
365
119
366
| "!doctype" ->
120
-
prefix ^ "<!DOCTYPE html>"
367
+
(prefix ^ "<!DOCTYPE html>", false)
121
368
122
369
| name ->
123
-
let open_tag = serialize_start_tag name node.attrs in
370
+
(* Sanitize element name to ensure valid HTML output *)
371
+
let name = sanitize_element_name name in
372
+
let name_lower = String.lowercase_ascii name in
373
+
374
+
(* Determine the foreign context for this element and its children.
375
+
If we enter SVG or MathML, track that. If we're at an HTML integration
376
+
point inside SVG, children are processed in HTML mode. *)
377
+
let this_foreign = match node.namespace with
378
+
| Some "svg" -> InSvg
379
+
| Some "mathml" -> InMathML
380
+
| _ -> in_foreign
381
+
in
382
+
383
+
(* Update foreign depth tracking *)
384
+
let entering_foreign = this_foreign <> NotForeign && in_foreign = NotForeign in
385
+
if entering_foreign then ctx.foreign_depth <- ctx.foreign_depth + 1;
386
+
387
+
(* For children: if we're at an SVG HTML integration point, children go back to HTML mode *)
388
+
let child_foreign =
389
+
if this_foreign = InSvg && is_svg_html_integration_point name then NotForeign
390
+
else this_foreign
391
+
in
392
+
393
+
(* When in foreign content, HTML breakout elements would cause the parser
394
+
to exit foreign content on reparse. To ensure roundtrip stability,
395
+
prefix them with 'x-' to make them custom elements. *)
396
+
let name =
397
+
if in_foreign <> NotForeign && is_html_breakout_element name then
398
+
"x-" ^ name
399
+
else
400
+
name
401
+
in
402
+
403
+
(* Handle nested formatting elements for adoption agency stability.
404
+
If we're about to serialize a formatting element that's already open,
405
+
we need to close the outer one first and reopen it after children.
406
+
This matches how the parser would reconstruct the elements. *)
407
+
let is_fmt = is_formatting_element name_lower in
408
+
let nested_fmt = is_fmt && has_open_formatting ctx name_lower in
124
409
125
-
if is_void name then
126
-
prefix ^ open_tag
127
-
else if node.children = [] then
128
-
prefix ^ open_tag ^ serialize_end_tag name
410
+
(* For nested formatting elements, don't output the inner tag at all -
411
+
instead, close the outer and let it reopen naturally. This produces
412
+
flatter HTML that the parser will handle consistently. *)
413
+
if nested_fmt then begin
414
+
(* Just serialize children without this element wrapper *)
415
+
let buf = Buffer.create 256 in
416
+
let plaintext_found = ref false in
417
+
let child_text_mode =
418
+
if is_raw_text_element name then Raw
419
+
else if is_escapable_raw_text_element name then EscapableRaw
420
+
else Normal
421
+
in
422
+
List.iter (fun child ->
423
+
if not !plaintext_found then begin
424
+
let (html, pt) = to_html_internal ~pretty ~indent_size ~indent ~text_mode:child_text_mode ~in_foreign:child_foreign ~ctx:(Some ctx) child in
425
+
if html <> "" then begin
426
+
if Buffer.length buf > 0 && pretty then Buffer.add_string buf newline;
427
+
Buffer.add_string buf html
428
+
end;
429
+
if pt then plaintext_found := true
430
+
end
431
+
) node.children;
432
+
if entering_foreign then ctx.foreign_depth <- ctx.foreign_depth - 1;
433
+
(Buffer.contents buf, !plaintext_found)
434
+
end
435
+
(* Empty tables cause foster-parenting instability - skip the table tag
436
+
and output children (comments/text) directly, since they would be
437
+
foster-parented out of the table during reparsing anyway. *)
438
+
else if is_empty_table name node.children then begin
439
+
let buf = Buffer.create 256 in
440
+
let plaintext_found = ref false in
441
+
List.iter (fun child ->
442
+
if not !plaintext_found then begin
443
+
let (html, pt) = to_html_internal ~pretty ~indent_size ~indent ~text_mode ~in_foreign:child_foreign ~ctx:(Some ctx) child in
444
+
if html <> "" then begin
445
+
if Buffer.length buf > 0 && pretty then Buffer.add_string buf newline;
446
+
Buffer.add_string buf html
447
+
end;
448
+
if pt then plaintext_found := true
449
+
end
450
+
) node.children;
451
+
if entering_foreign then ctx.foreign_depth <- ctx.foreign_depth - 1;
452
+
(Buffer.contents buf, !plaintext_found)
453
+
end
454
+
(* Structural elements (body, head, html) nested inside other elements
455
+
cause parsing instability. Skip the wrapper and output children directly. *)
456
+
else if is_structural_element name && indent > 0 then begin
457
+
let buf = Buffer.create 256 in
458
+
let plaintext_found = ref false in
459
+
List.iter (fun child ->
460
+
if not !plaintext_found then begin
461
+
let (html, pt) = to_html_internal ~pretty ~indent_size ~indent ~text_mode ~in_foreign:child_foreign ~ctx:(Some ctx) child in
462
+
if html <> "" then begin
463
+
if Buffer.length buf > 0 && pretty then Buffer.add_string buf newline;
464
+
Buffer.add_string buf html
465
+
end;
466
+
if pt then plaintext_found := true
467
+
end
468
+
) node.children;
469
+
if entering_foreign then ctx.foreign_depth <- ctx.foreign_depth - 1;
470
+
(Buffer.contents buf, !plaintext_found)
471
+
end
129
472
else begin
130
-
(* Check if all children are text *)
131
-
let all_text = List.for_all is_text node.children in
132
-
if all_text && pretty then
133
-
let text = String.concat "" (List.map (fun c -> c.data) node.children) in
134
-
prefix ^ open_tag ^ escape_text text ^ serialize_end_tag name
135
-
else begin
136
-
let parts = [prefix ^ open_tag] in
137
-
let child_parts = List.filter_map (fun child ->
138
-
let html = to_html ~pretty ~indent_size ~indent:(indent + 1) child in
139
-
if html = "" then None else Some html
140
-
) node.children in
141
-
let parts = parts @ child_parts @ [prefix ^ serialize_end_tag name] in
142
-
String.concat newline parts
143
-
end
473
+
(* Track this formatting element if applicable *)
474
+
if is_fmt then ctx.open_formatting <- name_lower :: ctx.open_formatting;
475
+
476
+
let open_tag = serialize_start_tag name node.attrs in
477
+
478
+
let result =
479
+
if is_void name then
480
+
(prefix ^ open_tag, false)
481
+
else if is_plaintext_element name then begin
482
+
(* plaintext is special: it cannot be closed once opened.
483
+
We serialize content as raw text without a closing tag.
484
+
Also signal that plaintext was encountered so ancestors
485
+
don't add closing tags. *)
486
+
let text = String.concat "" (List.map (fun c -> c.data) node.children) in
487
+
(prefix ^ open_tag ^ text, true)
488
+
end else if node.children = [] then
489
+
(prefix ^ open_tag ^ serialize_end_tag name, false)
490
+
else begin
491
+
(* Determine text mode for children based on this element *)
492
+
let child_text_mode =
493
+
if is_raw_text_element name then Raw
494
+
else if is_escapable_raw_text_element name then EscapableRaw
495
+
else Normal
496
+
in
497
+
(* Check if all children are text *)
498
+
let all_text = List.for_all is_text node.children in
499
+
(* Per HTML5 spec, pre/textarea/listing need leading newline doubled *)
500
+
let leading_newline =
501
+
if needs_leading_newline_preserved name &&
502
+
starts_with_newline (first_text_content node.children)
503
+
then "\n" else ""
504
+
in
505
+
506
+
(* Add implicit tbody wrapper for tables with direct tr/td children.
507
+
This prevents foster parenting on reparse. *)
508
+
let children, needs_tbody =
509
+
if needs_tbody_wrapper name node.children then begin
510
+
(* Wrap row/cell children in tbody *)
511
+
let (before, rows_and_after) = List.partition (fun c ->
512
+
let n = String.lowercase_ascii c.name in
513
+
n = "caption" || n = "colgroup" || n = "col"
514
+
) node.children in
515
+
if rows_and_after <> [] then
516
+
let tbody_node = {
517
+
name = "tbody";
518
+
namespace = None;
519
+
data = "";
520
+
attrs = [];
521
+
children = rows_and_after;
522
+
parent = None;
523
+
doctype = None;
524
+
template_content = None;
525
+
location = None;
526
+
} in
527
+
(before @ [tbody_node], true)
528
+
else
529
+
(node.children, false)
530
+
end else
531
+
(node.children, false)
532
+
in
533
+
let _ = needs_tbody in (* suppress warning *)
534
+
535
+
if all_text && not needs_tbody then begin
536
+
let text = String.concat "" (List.map (fun c -> c.data) node.children) in
537
+
let escaped = match child_text_mode with
538
+
| Normal -> escape_text text
539
+
| Raw -> text
540
+
| EscapableRaw -> escape_escapable_raw_text text
541
+
in
542
+
(prefix ^ open_tag ^ leading_newline ^ escaped ^ serialize_end_tag name, false)
543
+
end else begin
544
+
let buf = Buffer.create 256 in
545
+
Buffer.add_string buf (prefix ^ open_tag);
546
+
Buffer.add_string buf leading_newline;
547
+
let plaintext_found = ref false in
548
+
List.iter (fun child ->
549
+
if not !plaintext_found then begin
550
+
let (html, pt) = to_html_internal ~pretty ~indent_size ~indent:(indent + 1) ~text_mode:child_text_mode ~in_foreign:child_foreign ~ctx:(Some ctx) child in
551
+
if html <> "" then begin
552
+
Buffer.add_string buf newline;
553
+
Buffer.add_string buf html
554
+
end;
555
+
if pt then plaintext_found := true
556
+
end
557
+
) children;
558
+
(* Only add closing tag if plaintext wasn't found *)
559
+
if not !plaintext_found then begin
560
+
Buffer.add_string buf newline;
561
+
Buffer.add_string buf (prefix ^ serialize_end_tag name)
562
+
end;
563
+
(Buffer.contents buf, !plaintext_found)
564
+
end
565
+
end
566
+
in
567
+
568
+
(* Pop formatting element from stack *)
569
+
if is_fmt then
570
+
ctx.open_formatting <- (match ctx.open_formatting with _ :: rest -> rest | [] -> []);
571
+
572
+
if entering_foreign then ctx.foreign_depth <- ctx.foreign_depth - 1;
573
+
result
144
574
end
575
+
576
+
(* Public wrapper that discards the plaintext flag *)
577
+
let to_html ?(pretty=true) ?(indent_size=2) ?(indent=0) ?(text_mode=Normal) node =
578
+
fst (to_html_internal ~pretty ~indent_size ~indent ~text_mode node)
145
579
146
580
(* Get qualified name for test format *)
147
581
let qualified_name node =
···
226
660
if strip then String.trim combined else combined
227
661
228
662
(* Streaming serialization to a Bytes.Writer.t
229
-
Writes HTML directly to the writer without building intermediate strings *)
230
-
let rec to_writer ?(pretty=true) ?(indent_size=2) ?(indent=0) (w : Bytes.Writer.t) node =
663
+
Writes HTML directly to the writer without building intermediate strings
664
+
Returns true if a plaintext element was encountered (stops further serialization) *)
665
+
let rec to_writer_internal ?(pretty=true) ?(indent_size=2) ?(indent=0) ?(text_mode=Normal) (w : Bytes.Writer.t) node =
231
666
let write s = Bytes.Writer.write_string w s in
232
667
let write_prefix () = if pretty then write (String.make (indent * indent_size) ' ') in
233
668
let write_newline () = if pretty then write "\n" in
234
669
670
+
(* Escape text based on mode *)
671
+
let escape_for_mode text = match text_mode with
672
+
| Normal -> escape_text text
673
+
| Raw -> text
674
+
| EscapableRaw -> escape_escapable_raw_text text
675
+
in
676
+
235
677
match node.name with
236
678
| "#document" ->
237
-
let rec write_children first = function
238
-
| [] -> ()
239
-
| child :: rest ->
240
-
if not first && pretty then write_newline ();
241
-
to_writer ~pretty ~indent_size ~indent:0 w child;
242
-
write_children false rest
243
-
in
244
-
write_children true node.children
679
+
let plaintext_found = ref false in
680
+
let first = ref true in
681
+
List.iter (fun child ->
682
+
if not !plaintext_found then begin
683
+
if not !first && pretty then write_newline ();
684
+
let pt = to_writer_internal ~pretty ~indent_size ~indent:0 ~text_mode:Normal w child in
685
+
first := false;
686
+
if pt then plaintext_found := true
687
+
end
688
+
) node.children;
689
+
!plaintext_found
245
690
246
691
| "#document-fragment" ->
247
-
let rec write_children first = function
248
-
| [] -> ()
249
-
| child :: rest ->
250
-
if not first && pretty then write_newline ();
251
-
to_writer ~pretty ~indent_size ~indent w child;
252
-
write_children false rest
253
-
in
254
-
write_children true node.children
692
+
let plaintext_found = ref false in
693
+
let first = ref true in
694
+
List.iter (fun child ->
695
+
if not !plaintext_found then begin
696
+
if not !first && pretty then write_newline ();
697
+
let pt = to_writer_internal ~pretty ~indent_size ~indent ~text_mode w child in
698
+
first := false;
699
+
if pt then plaintext_found := true
700
+
end
701
+
) node.children;
702
+
!plaintext_found
255
703
256
704
| "#text" ->
257
705
let text = node.data in
258
-
if pretty then begin
706
+
if pretty && text_mode = Normal then begin
259
707
let trimmed = String.trim text in
260
708
if trimmed <> "" then begin
261
709
write_prefix ();
262
-
write (escape_text trimmed)
710
+
write (escape_for_mode trimmed)
263
711
end
264
712
end else
265
-
write (escape_text text)
713
+
write (escape_for_mode text);
714
+
false
266
715
267
716
| "#comment" ->
268
717
write_prefix ();
269
718
write "<!--";
270
719
write node.data;
271
-
write "-->"
720
+
write "-->";
721
+
false
272
722
273
723
| "!doctype" ->
274
724
write_prefix ();
275
-
write "<!DOCTYPE html>"
725
+
write "<!DOCTYPE html>";
726
+
false
276
727
277
728
| name ->
729
+
(* Sanitize element name to ensure valid HTML output *)
730
+
let name = sanitize_element_name name in
278
731
write_prefix ();
279
732
write (serialize_start_tag name node.attrs);
280
733
281
-
if not (is_void name) then begin
282
-
if node.children = [] then
283
-
write (serialize_end_tag name)
284
-
else begin
285
-
(* Check if all children are text *)
286
-
let all_text = List.for_all is_text node.children in
287
-
if all_text && pretty then begin
288
-
let text = String.concat "" (List.map (fun c -> c.data) node.children) in
289
-
write (escape_text text);
290
-
write (serialize_end_tag name)
291
-
end else begin
292
-
let rec write_children = function
293
-
| [] -> ()
294
-
| child :: rest ->
295
-
write_newline ();
296
-
to_writer ~pretty ~indent_size ~indent:(indent + 1) w child;
297
-
write_children rest
298
-
in
299
-
write_children node.children;
734
+
if is_void name then
735
+
false (* No end tag for void elements *)
736
+
else if is_plaintext_element name then begin
737
+
(* plaintext is special: cannot be closed, content is raw *)
738
+
let text = String.concat "" (List.map (fun c -> c.data) node.children) in
739
+
write text;
740
+
(* No closing tag for plaintext, signal to stop further serialization *)
741
+
true
742
+
end else if node.children = [] then begin
743
+
write (serialize_end_tag name);
744
+
false
745
+
end else begin
746
+
(* Determine text mode for children based on this element *)
747
+
let child_text_mode =
748
+
if is_raw_text_element name then Raw
749
+
else if is_escapable_raw_text_element name then EscapableRaw
750
+
else Normal
751
+
in
752
+
(* Check if all children are text *)
753
+
let all_text = List.for_all is_text node.children in
754
+
(* Per HTML5 spec, pre/textarea/listing need leading newline doubled *)
755
+
let needs_leading_nl =
756
+
needs_leading_newline_preserved name &&
757
+
starts_with_newline (first_text_content node.children)
758
+
in
759
+
if all_text then begin
760
+
let text = String.concat "" (List.map (fun c -> c.data) node.children) in
761
+
let escaped = match child_text_mode with
762
+
| Normal -> escape_text text
763
+
| Raw -> text
764
+
| EscapableRaw -> escape_escapable_raw_text text
765
+
in
766
+
if needs_leading_nl then write "\n";
767
+
write escaped;
768
+
write (serialize_end_tag name);
769
+
false
770
+
end else begin
771
+
if needs_leading_nl then write "\n";
772
+
let plaintext_found = ref false in
773
+
List.iter (fun child ->
774
+
if not !plaintext_found then begin
775
+
write_newline ();
776
+
let pt = to_writer_internal ~pretty ~indent_size ~indent:(indent + 1) ~text_mode:child_text_mode w child in
777
+
if pt then plaintext_found := true
778
+
end
779
+
) node.children;
780
+
(* Only add closing tag if plaintext wasn't found *)
781
+
if not !plaintext_found then begin
300
782
write_newline ();
301
783
write_prefix ();
302
784
write (serialize_end_tag name)
303
-
end
785
+
end;
786
+
!plaintext_found
304
787
end
305
788
end
789
+
790
+
(* Public wrapper that discards the plaintext flag *)
791
+
let to_writer ?(pretty=true) ?(indent_size=2) ?(indent=0) (w : Bytes.Writer.t) node =
792
+
ignore (to_writer_internal ~pretty ~indent_size ~indent w node)
+3
lib/html5rw/parser/parser_tree_builder.ml
+3
lib/html5rw/parser/parser_tree_builder.ml
···
208
208
end
209
209
210
210
let insert_element t name ?(namespace=None) ?(push=false) attrs =
211
+
(* Reset ignore_lf flag - per HTML5 spec, only the immediately next token
212
+
after pre/textarea/listing should be checked for leading LF *)
213
+
t.ignore_lf <- false;
211
214
let location = Dom.make_location ~line:t.current_line ~column:t.current_column () in
212
215
let node = Dom.create_element name ~namespace ~attrs ~location () in
213
216
let (parent, before) = appropriate_insertion_place t in
+13
-1
lib/html5rw/tokenizer/tokenizer_impl.ml
+13
-1
lib/html5rw/tokenizer/tokenizer_impl.ml
···
711
711
t.state <- Tokenizer_state.Bogus_comment
712
712
713
713
and state_tag_name () =
714
-
match Tokenizer_stream.consume t.stream with
714
+
match Tokenizer_stream.peek t.stream with
715
715
| Some ('\t' | '\n' | '\x0C' | ' ') ->
716
+
Tokenizer_stream.advance t.stream;
716
717
t.state <- Tokenizer_state.Before_attribute_name
717
718
| Some '/' ->
719
+
Tokenizer_stream.advance t.stream;
718
720
t.state <- Tokenizer_state.Self_closing_start_tag
719
721
| Some '>' ->
722
+
Tokenizer_stream.advance t.stream;
720
723
t.state <- Tokenizer_state.Data;
721
724
emit_current_tag ()
722
725
| Some '\x00' ->
726
+
Tokenizer_stream.advance t.stream;
723
727
error t "unexpected-null-character";
724
728
Buffer.add_string t.current_tag_name "\xEF\xBF\xBD"
729
+
| Some '<' ->
730
+
(* Per HTML5 spec section 13.2.5.8: '<' is "anything else" - append to tag name.
731
+
Note: The previous implementation incorrectly emitted the tag and switched
732
+
to tag open state. The spec says to just append the character to the tag name
733
+
without emitting an error. *)
734
+
Tokenizer_stream.advance t.stream;
735
+
Buffer.add_char t.current_tag_name '<'
725
736
| Some c ->
737
+
Tokenizer_stream.advance t.stream;
726
738
check_control_char c;
727
739
Buffer.add_char t.current_tag_name (ascii_lower c)
728
740
| None -> ()
+76
-78
lib/js/dune
+76
-78
lib/js/dune
···
1
1
; HTML5rw JavaScript Validator Library
2
2
; Compiled with js_of_ocaml for browser use
3
-
;
4
-
; Build rules temporarily disabled - code kept in place
5
3
6
-
; (library
7
-
; (name htmlrw_js)
8
-
; (public_name html5rw.js)
9
-
; (libraries
10
-
; html5rw
11
-
; htmlrw_check
12
-
; bytesrw
13
-
; brr)
14
-
; (modes byte) ; js_of_ocaml requires bytecode
15
-
; (modules
16
-
; htmlrw_js_types
17
-
; htmlrw_js_dom
18
-
; htmlrw_js_annotate
19
-
; htmlrw_js_ui
20
-
; htmlrw_js))
4
+
(library
5
+
(name htmlrw_js)
6
+
(public_name html5rw.js)
7
+
(libraries
8
+
html5rw
9
+
htmlrw_check
10
+
bytesrw
11
+
brr)
12
+
(modes byte) ; js_of_ocaml requires bytecode
13
+
(modules
14
+
htmlrw_js_types
15
+
htmlrw_js_dom
16
+
htmlrw_js_annotate
17
+
htmlrw_js_ui
18
+
htmlrw_js))
21
19
22
20
; Standalone JavaScript file for direct browser use
23
21
; This compiles the library entry point to a .js file
24
-
; (executable
25
-
; (name htmlrw_js_main)
26
-
; (libraries htmlrw_js)
27
-
; (js_of_ocaml
28
-
; (javascript_files))
29
-
; (modes js wasm)
30
-
; (modules htmlrw_js_main))
22
+
(executable
23
+
(name htmlrw_js_main)
24
+
(libraries htmlrw_js)
25
+
(js_of_ocaml
26
+
(javascript_files))
27
+
(modes js wasm)
28
+
(modules htmlrw_js_main))
31
29
32
30
; Web Worker for background validation
33
31
; Runs validation in a separate thread to avoid blocking the UI
34
-
; (executable
35
-
; (name htmlrw_js_worker)
36
-
; (libraries html5rw htmlrw_check bytesrw brr)
37
-
; (js_of_ocaml
38
-
; (javascript_files))
39
-
; (modes js wasm)
40
-
; (modules htmlrw_js_worker))
32
+
(executable
33
+
(name htmlrw_js_worker)
34
+
(libraries html5rw htmlrw_check bytesrw brr)
35
+
(js_of_ocaml
36
+
(javascript_files))
37
+
(modes js wasm)
38
+
(modules htmlrw_js_worker))
41
39
42
40
; Test runner for browser-based regression testing
43
41
; Runs html5lib conformance tests in the browser
44
-
; (executable
45
-
; (name htmlrw_js_tests_main)
46
-
; (libraries html5rw bytesrw brr)
47
-
; (js_of_ocaml
48
-
; (javascript_files))
49
-
; (modes js wasm)
50
-
; (modules htmlrw_js_tests htmlrw_js_tests_main))
42
+
(executable
43
+
(name htmlrw_js_tests_main)
44
+
(libraries html5rw bytesrw brr)
45
+
(js_of_ocaml
46
+
(javascript_files))
47
+
(modes js wasm)
48
+
(modules htmlrw_js_tests htmlrw_js_tests_main))
51
49
52
50
; Copy to nice filenames (JS)
53
-
; (rule
54
-
; (targets htmlrw.js)
55
-
; (deps htmlrw_js_main.bc.js)
56
-
; (action (copy %{deps} %{targets})))
51
+
(rule
52
+
(targets htmlrw.js)
53
+
(deps htmlrw_js_main.bc.js)
54
+
(action (copy %{deps} %{targets})))
57
55
58
-
; (rule
59
-
; (targets htmlrw-worker.js)
60
-
; (deps htmlrw_js_worker.bc.js)
61
-
; (action (copy %{deps} %{targets})))
56
+
(rule
57
+
(targets htmlrw-worker.js)
58
+
(deps htmlrw_js_worker.bc.js)
59
+
(action (copy %{deps} %{targets})))
62
60
63
-
; (rule
64
-
; (targets htmlrw-tests.js)
65
-
; (deps htmlrw_js_tests_main.bc.js)
66
-
; (action (copy %{deps} %{targets})))
61
+
(rule
62
+
(targets htmlrw-tests.js)
63
+
(deps htmlrw_js_tests_main.bc.js)
64
+
(action (copy %{deps} %{targets})))
67
65
68
66
; Copy to nice filenames (WASM)
69
67
; Note: requires wasm_of_ocaml-compiler to be installed
70
-
; (rule
71
-
; (targets htmlrw.wasm.js)
72
-
; (deps htmlrw_js_main.bc.wasm.js)
73
-
; (action (copy %{deps} %{targets})))
68
+
(rule
69
+
(targets htmlrw.wasm.js)
70
+
(deps htmlrw_js_main.bc.wasm.js)
71
+
(action (copy %{deps} %{targets})))
74
72
75
-
; (rule
76
-
; (targets htmlrw-worker.wasm.js)
77
-
; (deps htmlrw_js_worker.bc.wasm.js)
78
-
; (action (copy %{deps} %{targets})))
73
+
(rule
74
+
(targets htmlrw-worker.wasm.js)
75
+
(deps htmlrw_js_worker.bc.wasm.js)
76
+
(action (copy %{deps} %{targets})))
79
77
80
-
; (rule
81
-
; (targets htmlrw-tests.wasm.js)
82
-
; (deps htmlrw_js_tests_main.bc.wasm.js)
83
-
; (action (copy %{deps} %{targets})))
78
+
(rule
79
+
(targets htmlrw-tests.wasm.js)
80
+
(deps htmlrw_js_tests_main.bc.wasm.js)
81
+
(action (copy %{deps} %{targets})))
84
82
85
83
; Install web assets to share/html5rw-js/ for npm packaging
86
-
; (install
87
-
; (package html5rw-js)
88
-
; (section share)
89
-
; (files
90
-
; ; JavaScript bundles
91
-
; htmlrw.js
92
-
; htmlrw-worker.js
93
-
; htmlrw-tests.js
94
-
; ; WASM loader scripts
95
-
; htmlrw.wasm.js
96
-
; htmlrw-worker.wasm.js
97
-
; htmlrw-tests.wasm.js
98
-
; ; WASM assets (with content-hashed filenames)
99
-
; (glob_files_rec (htmlrw_js_main.bc.wasm.assets/* with_prefix htmlrw_js_main.bc.wasm.assets))
100
-
; (glob_files_rec (htmlrw_js_worker.bc.wasm.assets/* with_prefix htmlrw_js_worker.bc.wasm.assets))
101
-
; (glob_files_rec (htmlrw_js_tests_main.bc.wasm.assets/* with_prefix htmlrw_js_tests_main.bc.wasm.assets))))
84
+
(install
85
+
(package html5rw-js)
86
+
(section share)
87
+
(files
88
+
; JavaScript bundles
89
+
htmlrw.js
90
+
htmlrw-worker.js
91
+
htmlrw-tests.js
92
+
; WASM loader scripts
93
+
htmlrw.wasm.js
94
+
htmlrw-worker.wasm.js
95
+
htmlrw-tests.wasm.js
96
+
; WASM assets (with content-hashed filenames)
97
+
(glob_files_rec (htmlrw_js_main.bc.wasm.assets/* with_prefix htmlrw_js_main.bc.wasm.assets))
98
+
(glob_files_rec (htmlrw_js_worker.bc.wasm.assets/* with_prefix htmlrw_js_worker.bc.wasm.assets))
99
+
(glob_files_rec (htmlrw_js_tests_main.bc.wasm.assets/* with_prefix htmlrw_js_tests_main.bc.wasm.assets))))