Alex Hochheiden
d0470670a1
`third_party/node/node_modules` is generated by `./mach vendor node`. Differential Revision: https://phabricator.services.mozilla.com/D320322
65 lines
2.5 KiB
JavaScript
65 lines
2.5 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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// Placeholders embedded into asset `url()` / HTML chunk URLs at code-generation
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// time, when the final public path can't be resolved yet, then substituted
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// later once the information is available:
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// - PUBLIC_PATH_AUTO — stands in for `output.publicPath: "auto"`; replaced
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// with the per-output-file undo path (relative `../` segments back to the
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// output root) during chunk/asset render.
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// - PUBLIC_PATH_FULL_HASH — stands in for `[fullhash]`/`[hash]` in a public
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// path before the compilation hash exists. Form: `<prefix><len>__`, where
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// `<len>` is the requested hash length (`0` means the full hash). Replaced
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// with the real hash (build-time, e.g. CSS `.css` files) or a runtime
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// `__webpack_require__.h()` expression (inlined CSS in JS).
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const PUBLIC_PATH_AUTO = "__WEBPACK_CSS_PUBLIC_PATH_AUTO__";
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const PUBLIC_PATH_FULL_HASH = "__WEBPACK_CSS_PUBLIC_PATH_FULL_HASH_";
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/**
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* Scan `content` for `PUBLIC_PATH_FULL_HASH` placeholders and invoke `onMatch`
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* once per well-formed occurrence. The placeholder spans the half-open range
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* `[start, end)` and encodes the requested hash length (`0` means the full
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* hash). Callers substitute the build-time hash or a runtime expression
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* depending on context.
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* @param {string} content text to scan
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* @param {(start: number, end: number, length: number) => void} onMatch placeholder callback
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* @returns {void}
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*/
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const walkFullHashPlaceholders = (content, onMatch) => {
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const prefix = PUBLIC_PATH_FULL_HASH;
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const prefixLen = prefix.length;
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const len = content.length;
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let idx = content.indexOf(prefix);
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while (idx !== -1) {
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let digitEnd = idx + prefixLen;
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while (digitEnd < len) {
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const cc = content.charCodeAt(digitEnd);
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if (cc < 48 || cc > 57) break;
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digitEnd++;
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}
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// Well-formed placeholder: at least one digit followed by `__`.
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if (
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digitEnd > idx + prefixLen &&
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digitEnd + 1 < len &&
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content.charCodeAt(digitEnd) === 95 &&
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content.charCodeAt(digitEnd + 1) === 95
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) {
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const length = Number.parseInt(
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content.slice(idx + prefixLen, digitEnd),
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10
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);
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onMatch(idx, digitEnd + 2, length);
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idx = content.indexOf(prefix, digitEnd + 2);
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} else {
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idx = content.indexOf(prefix, idx + prefixLen);
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}
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}
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};
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module.exports.PUBLIC_PATH_AUTO = PUBLIC_PATH_AUTO;
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module.exports.PUBLIC_PATH_FULL_HASH = PUBLIC_PATH_FULL_HASH;
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module.exports.walkFullHashPlaceholders = walkFullHashPlaceholders;
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