76 lines
2.3 KiB
JavaScript
76 lines
2.3 KiB
JavaScript
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"use strict";
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exports.__esModule = true;
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exports["default"] = unesc;
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// Many thanks for this post which made this migration much easier.
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// https://mathiasbynens.be/notes/css-escapes
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/**
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*
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* @param {string} str
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* @returns {[string, number]|undefined}
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*/
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function gobbleHex(str) {
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var lower = str.toLowerCase();
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var hex = '';
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var spaceTerminated = false;
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for (var i = 0; i < 6 && lower[i] !== undefined; i++) {
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var code = lower.charCodeAt(i);
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// check to see if we are dealing with a valid hex char [a-f|0-9]
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var valid = code >= 97 && code <= 102 || code >= 48 && code <= 57;
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// https://drafts.csswg.org/css-syntax/#consume-escaped-code-point
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spaceTerminated = code === 32;
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if (!valid) {
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break;
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}
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hex += lower[i];
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}
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if (hex.length === 0) {
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return undefined;
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}
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var codePoint = parseInt(hex, 16);
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var isSurrogate = codePoint >= 0xD800 && codePoint <= 0xDFFF;
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// Add special case for
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// "If this number is zero, or is for a surrogate, or is greater than the maximum allowed code point"
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// https://drafts.csswg.org/css-syntax/#maximum-allowed-code-point
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if (isSurrogate || codePoint === 0x0000 || codePoint > 0x10FFFF) {
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return ["\uFFFD", hex.length + (spaceTerminated ? 1 : 0)];
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}
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return [String.fromCodePoint(codePoint), hex.length + (spaceTerminated ? 1 : 0)];
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}
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var CONTAINS_ESCAPE = /\\/;
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function unesc(str) {
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var needToProcess = CONTAINS_ESCAPE.test(str);
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if (!needToProcess) {
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return str;
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}
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var ret = "";
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for (var i = 0; i < str.length; i++) {
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if (str[i] === "\\") {
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var gobbled = gobbleHex(str.slice(i + 1, i + 7));
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if (gobbled !== undefined) {
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ret += gobbled[0];
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i += gobbled[1];
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continue;
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}
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// Retain a pair of \\ if double escaped `\\\\`
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// https://github.com/postcss/postcss-selector-parser/commit/268c9a7656fb53f543dc620aa5b73a30ec3ff20e
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if (str[i + 1] === "\\") {
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ret += "\\";
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i++;
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continue;
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}
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// if \\ is at the end of the string retain it
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// https://github.com/postcss/postcss-selector-parser/commit/01a6b346e3612ce1ab20219acc26abdc259ccefb
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if (str.length === i + 1) {
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ret += str[i];
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}
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continue;
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}
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ret += str[i];
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}
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return ret;
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}
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module.exports = exports.default;
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