104 lines
2.8 KiB
JavaScript
104 lines
2.8 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Ivan Kopeykin @vankop
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*/
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"use strict";
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const memorize = require("./memoize");
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const getUrl = memorize(() => require("url"));
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const PATH_QUERY_FRAGMENT_REGEXP =
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/^(#?(?:\0.|[^?#\0])*)(\?(?:\0.|[^#\0])*)?(#.*)?$/;
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const ZERO_ESCAPE_REGEXP = /\0(.)/g;
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const FILE_REG_EXP = /file:/i;
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/**
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* Index past a DOS device path prefix (`\\?\…` or `\\.\…`), or 0. Kept
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* out of `parseIdentifier` on purpose: inlining it back bloats the caller
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* beyond the size where V8's interpreter and JIT both handle it well
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* (the cause of the description-files-multi CodSpeed regression).
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* @param {string} identifier identifier known to start with `\`
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* @returns {number} 4 if identifier starts with a DOS device prefix, else 0
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*/
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function dosPrefixEnd(identifier) {
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if (
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identifier.length >= 4 &&
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identifier.charCodeAt(1) === 92 &&
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identifier.charCodeAt(3) === 92
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) {
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const c2 = identifier.charCodeAt(2);
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if (c2 === 63 || c2 === 46) return 4;
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}
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return 0;
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}
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/**
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* @param {string} identifier identifier
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* @returns {[string, string, string] | null} parsed identifier
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*/
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function parseIdentifier(identifier) {
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if (!identifier) {
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return null;
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}
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if (FILE_REG_EXP.test(identifier)) {
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identifier = getUrl().fileURLToPath(identifier);
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}
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const firstEscape = identifier.indexOf("\0");
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// Handle `\0`
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if (firstEscape !== -1) {
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const match = PATH_QUERY_FRAGMENT_REGEXP.exec(identifier);
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if (!match) return null;
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return [
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match[1].replace(ZERO_ESCAPE_REGEXP, "$1"),
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match[2] ? match[2].replace(ZERO_ESCAPE_REGEXP, "$1") : "",
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match[3] || "",
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];
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}
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// Fast path for inputs that don't use \0 escaping. DOS device paths
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// (`\\?\…`, `\\.\…`) embed a literal `?` / `.` that must not be read
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// as a query separator; skip past the prefix when the input actually
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// starts with `\`. Gate is a single char-code compare so this function
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// stays inside V8's inline budget for its hot callers (resolver parse).
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const scanStart =
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identifier.charCodeAt(0) === 92 ? dosPrefixEnd(identifier) : 0;
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const queryStart = identifier.indexOf("?", scanStart);
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// Start at index 1 (or past a DOS prefix) to ignore a possible leading hash.
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const fragmentStart = identifier.indexOf("#", scanStart || 1);
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if (fragmentStart < 0) {
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if (queryStart < 0) {
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// No fragment, no query
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return [identifier, "", ""];
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}
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// Query, no fragment
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return [identifier.slice(0, queryStart), identifier.slice(queryStart), ""];
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}
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if (queryStart < 0 || fragmentStart < queryStart) {
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// Fragment, no query
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return [
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identifier.slice(0, fragmentStart),
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"",
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identifier.slice(fragmentStart),
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];
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}
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// Query and fragment
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return [
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identifier.slice(0, queryStart),
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identifier.slice(queryStart, fragmentStart),
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identifier.slice(fragmentStart),
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];
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}
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module.exports.parseIdentifier = parseIdentifier;
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