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javascript for 🐜's, a tiny runtime with big ambitions antjs.org
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Zig
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127const std = @import("std");
pub const InternedString = struct { ptr: [*]const u8, len: u32,
pub fn slice(self: InternedString) []const u8 { return self.ptr[0..self.len]; }
pub fn eql(a: InternedString, b: InternedString) bool { return a.ptr == b.ptr and a.len == b.len; }
pub fn hash(self: InternedString) u64 { return @intFromPtr(self.ptr); }
pub const empty: InternedString = .{ .ptr = "", .len = 0 };};
pub const StringPool = struct { allocator: std.mem.Allocator, strings: std.StringHashMap(InternedString), storage: std.ArrayListUnmanaged([]const u8),
pub fn init(allocator: std.mem.Allocator) StringPool { return .{ .allocator = allocator, .strings = std.StringHashMap(InternedString).init(allocator), .storage = std.ArrayListUnmanaged([]const u8){}, }; }
pub fn deinit(self: *StringPool) void { for (self.storage.items) |s| { self.allocator.free(s); } self.storage.deinit(self.allocator); self.strings.deinit(); }
pub fn intern(self: *StringPool, str: []const u8) !InternedString { if (str.len == 0) return InternedString.empty; if (self.strings.get(str)) |interned| return interned;
const owned = try self.allocator.dupe(u8, str); errdefer self.allocator.free(owned);
try self.storage.append(self.allocator, owned);
const interned = InternedString{ .ptr = owned.ptr, .len = @intCast(owned.len), };
try self.strings.put(owned, interned); return interned; }
pub fn internOwned(self: *StringPool, owned: []const u8) !InternedString { if (owned.len == 0) return InternedString.empty;
if (self.strings.get(owned)) |interned| { self.allocator.free(@constCast(owned)); return interned; }
try self.storage.append(self.allocator, owned);
const interned = InternedString{ .ptr = owned.ptr, .len = @intCast(owned.len), };
try self.strings.put(owned, interned); return interned; }
pub fn stats(self: *const StringPool) Stats { var total_bytes: usize = 0; for (self.storage.items) |s| { total_bytes += s.len; } return .{ .string_count = self.storage.items.len, .total_bytes = total_bytes, }; }
pub const Stats = struct { string_count: usize, total_bytes: usize, };};
pub const CommonStrings = struct { pool: *StringPool,
lodash: InternedString = InternedString.empty, react: InternedString = InternedString.empty, typescript: InternedString = InternedString.empty, webpack: InternedString = InternedString.empty, babel: InternedString = InternedString.empty, eslint: InternedString = InternedString.empty, jest: InternedString = InternedString.empty, express: InternedString = InternedString.empty,
caret: InternedString = InternedString.empty, // ^ tilde: InternedString = InternedString.empty, // ~
pub fn init(pool: *StringPool) !CommonStrings { return .{ .pool = pool, .lodash = try pool.intern("lodash"), .react = try pool.intern("react"), .typescript = try pool.intern("typescript"), .webpack = try pool.intern("webpack"), .babel = try pool.intern("@babel/core"), .eslint = try pool.intern("eslint"), .jest = try pool.intern("jest"), .express = try pool.intern("express"), .caret = try pool.intern("^"), .tilde = try pool.intern("~"), }; }};