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Current File : /home/nicngo5/nicnwebsiteUpgrade/node_modules/postcss-selector-parser/dist/util/unesc.js
"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;

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