pierrelf.com
we (web engine): Experimental web browser project to understand the limits of Claude
1//! JavaScript engine — lexer, parser, bytecode, register VM, GC, JIT (AArch64).
2
3pub mod ast;
4pub mod lexer;
5pub mod parser;
6
7use std::fmt;
8
9/// An error produced by the JavaScript engine.
10#[derive(Debug)]
11pub enum JsError {
12 /// The engine does not yet support this feature or syntax.
13 NotImplemented,
14 /// A parse/syntax error in the source.
15 SyntaxError(String),
16 /// A runtime error during execution.
17 RuntimeError(String),
18}
19
20impl fmt::Display for JsError {
21 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
22 match self {
23 JsError::NotImplemented => write!(f, "not implemented"),
24 JsError::SyntaxError(msg) => write!(f, "SyntaxError: {}", msg),
25 JsError::RuntimeError(msg) => write!(f, "RuntimeError: {}", msg),
26 }
27 }
28}
29
30/// Evaluate a JavaScript source string and return the completion value.
31///
32/// This is a stub that always returns `NotImplemented`. The real
33/// implementation will lex, parse, compile to bytecode, and execute.
34pub fn evaluate(_source: &str) -> Result<(), JsError> {
35 Err(JsError::NotImplemented)
36}