70 lines
1.6 KiB
JavaScript
70 lines
1.6 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 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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/**
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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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const firstEscape = identifier.indexOf("\0");
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if (firstEscape < 0) {
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// Fast path for inputs that don't use \0 escaping.
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const queryStart = identifier.indexOf("?");
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// Start at index 1 to ignore a possible leading hash.
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const fragmentStart = identifier.indexOf("#", 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 [
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identifier.slice(0, queryStart),
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identifier.slice(queryStart),
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"",
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];
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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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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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module.exports.parseIdentifier = parseIdentifier;
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