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"use strict";
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;