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