the-forest/client/node_modules/cjs-module-lexer/dist/lexer-external.js
2024-09-17 20:35:18 -04:00

91 lines
2.9 KiB
JavaScript

"use strict";
exports.init = init;
exports.parse = parse;
let wasm;
const isLE = new Uint8Array(new Uint16Array([1]).buffer)[0] === 1;
function parse(source, name = '@') {
if (!wasm) throw new Error('Not initialized');
const len = source.length + 1;
// need 2 bytes per code point plus analysis space so we double again
const extraMem = (wasm.__heap_base.value || wasm.__heap_base) + len * 4 - wasm.memory.buffer.byteLength;
if (extraMem > 0) wasm.memory.grow(Math.ceil(extraMem / 65536));
const addr = wasm.sa(len);
(isLE ? copyLE : copyBE)(source, new Uint16Array(wasm.memory.buffer, addr, len));
const err_code = wasm.parseCJS(addr, source.length, 0, 0, 0);
if (err_code) {
const err = new Error(`Parse error ${name}${wasm.e()}:${source.slice(0, wasm.e()).split('\n').length}:${wasm.e() - source.lastIndexOf('\n', wasm.e() - 1)}`);
Object.assign(err, {
idx: wasm.e()
});
if (err_code === 5 || err_code === 6 || err_code === 7) Object.assign(err, {
code: 'ERR_LEXER_ESM_SYNTAX'
});
throw err;
}
let exports = new Set(),
reexports = new Set(),
unsafeGetters = new Set();
while (wasm.rre()) {
const reexptStr = decode(source.slice(wasm.res(), wasm.ree()));
if (reexptStr) reexports.add(reexptStr);
}
while (wasm.ru()) unsafeGetters.add(decode(source.slice(wasm.us(), wasm.ue())));
while (wasm.re()) {
let exptStr = decode(source.slice(wasm.es(), wasm.ee()));
if (exptStr !== undefined && !unsafeGetters.has(exptStr)) exports.add(exptStr);
}
return {
exports: [...exports],
reexports: [...reexports]
};
}
function decode(str) {
if (str[0] === '"' || str[0] === '\'') {
try {
const decoded = (0, eval)(str);
// Filter to exclude non-matching UTF-16 surrogate strings
for (let i = 0; i < decoded.length; i++) {
const surrogatePrefix = decoded.charCodeAt(i) & 0xFC00;
if (surrogatePrefix < 0xD800) {
// Not a surrogate
continue;
} else if (surrogatePrefix === 0xD800) {
// Validate surrogate pair
if ((decoded.charCodeAt(++i) & 0xFC00) !== 0xDC00) return;
} else {
// Out-of-range surrogate code (above 0xD800)
return;
}
}
return decoded;
} catch {}
} else {
return str;
}
}
function copyBE(src, outBuf16) {
const len = src.length;
let i = 0;
while (i < len) {
const ch = src.charCodeAt(i);
outBuf16[i++] = (ch & 0xff) << 8 | ch >>> 8;
}
}
function copyLE(src, outBuf16) {
const len = src.length;
let i = 0;
while (i < len) outBuf16[i] = src.charCodeAt(i++);
}
let initPromise;
function init() {
if (initPromise) return initPromise;
return initPromise = (async () => {
const compiled = await WebAssembly.compile((await import('node:fs')).readFileSync(new URL(import.meta.resolve('../lib/lexer.wasm'))));
const {
exports
} = await WebAssembly.instantiate(compiled);
wasm = exports;
})();
}