unescape-js/dist/index.js

Unescape JavaScript special characters

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

require("string.fromcodepoint");

/**
 * \\ - matches the backslash which indicates the beginning of an escape sequence
 * (
 *   u\{([0-9A-Fa-f]+)\} - first alternative; matches the variable-length hexadecimal escape sequence (\u{ABCD0})
 * |
 *   u([0-9A-Fa-f]{4}) - second alternative; matches the 4-digit hexadecimal escape sequence (\uABCD)
 * |
 *   x([0-9A-Fa-f]{2}) - third alternative; matches the 2-digit hexadecimal escape sequence (\xA5)
 * |
 *   ([1-7][0-7]{0,2}|[0-7]{2,3}) - fourth alternative; matches the up-to-3-digit octal escape sequence (\5 or \512)
 * |
 *   (['"tbrnfv0\\]) - fifth alternative; matches the special escape characters (\t, \n and so on)
 * |
 *   \U([0-9A-Fa-f]+) - sixth alternative; matches the 8-digit hexadecimal escape sequence used by python (\U0001F3B5)
 * )
 */
var jsEscapeRegex = /\\(u\{([0-9A-Fa-f]+)\}|u([0-9A-Fa-f]{4})|x([0-9A-Fa-f]{2})|([1-7][0-7]{0,2}|[0-7]{2,3})|(['"tbrnfv0\\]))|\\U([0-9A-Fa-f]{8})/g;
var usualEscapeSequences = {
  '0': '\0',
  'b': '\b',
  'f': '\f',
  'n': '\n',
  'r': '\r',
  't': '\t',
  'v': '\v',
  '\'': '\'',
  '"': '"',
  '\\': '\\'
};

var fromHex = function fromHex(str) {
  return String.fromCodePoint(parseInt(str, 16));
};

var fromOct = function fromOct(str) {
  return String.fromCodePoint(parseInt(str, 8));
};

var _default = function _default(string) {
  return string.replace(jsEscapeRegex, function (_, __, varHex, longHex, shortHex, octal, specialCharacter, python) {
    if (varHex !== undefined) {
      return fromHex(varHex);
    } else if (longHex !== undefined) {
      return fromHex(longHex);
    } else if (shortHex !== undefined) {
      return fromHex(shortHex);
    } else if (octal !== undefined) {
      return fromOct(octal);
    } else if (python !== undefined) {
      return fromHex(python);
    } else {
      return usualEscapeSequences[specialCharacter];
    }
  });
};

exports.default = _default;
module.exports = exports.default;