/**
 * LR parser generated by the Syntax tool.
 *
 * https://www.npmjs.com/package/syntax-cli
 *
 *   npm install -g syntax-cli
 *
 *   syntax-cli --help
 *
 * To regenerate run:
 *
 *   syntax-cli \
 *     --grammar ~/path-to-grammar-file \
 *     --mode <parsing-mode> \
 *     --output ~/path-to-output-parser-file.js
 */

'use strict';

/**
 * Matched token text.
 */

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

var yytext = void 0;

/**
 * Length of the matched token text.
 */
var yyleng = void 0;

/**
 * Storage object.
 */
var yy = {};

/**
 * Result of semantic action.
 */
var __ = void 0;

/**
 * Result location object.
 */
var __loc = void 0;

function yyloc(start, end) {
  if (!yy.options.captureLocations) {
    return null;
  }

  // Epsilon doesn't produce location.
  if (!start || !end) {
    return start || end;
  }

  return {
    startOffset: start.startOffset,
    endOffset: end.endOffset,
    startLine: start.startLine,
    endLine: end.endLine,
    startColumn: start.startColumn,
    endColumn: end.endColumn
  };
}

var EOF = '$';

/**
 * List of productions (generated by Syntax tool).
 */
var productions = [[-1, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [0, 4, function (_1, _2, _3, _4, _1loc, _2loc, _3loc, _4loc) {
  __loc = yyloc(_1loc, _4loc);
  __ = Node({
    type: 'RegExp',
    body: _2,
    flags: checkFlags(_4)
  }, loc(_1loc, _4loc || _3loc));
}], [1, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [1, 0, function () {
  __loc = null;__ = '';
}], [2, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [2, 2, function (_1, _2, _1loc, _2loc) {
  __loc = yyloc(_1loc, _2loc);__ = _1 + _2;
}], [3, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [4, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [4, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  // Location for empty disjunction: /|/
  var _loc = null;

  if (_2loc) {
    _loc = loc(_1loc || _2loc, _3loc || _2loc);
  };

  __ = Node({
    type: 'Disjunction',
    left: _1,
    right: _3
  }, _loc);
}], [5, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  if (_1.length === 0) {
    __ = null;
    return;
  }

  if (_1.length === 1) {
    __ = Node(_1[0], __loc);
  } else {
    __ = Node({
      type: 'Alternative',
      expressions: _1
    }, __loc);
  }
}], [6, 0, function () {
  __loc = null;__ = [];
}], [6, 2, function (_1, _2, _1loc, _2loc) {
  __loc = yyloc(_1loc, _2loc);__ = _1.concat(_2);
}], [7, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Node(Object.assign({ type: 'Assertion' }, _1), __loc);
}], [7, 2, function (_1, _2, _1loc, _2loc) {
  __loc = yyloc(_1loc, _2loc);
  __ = _1;

  if (_2) {
    __ = Node({
      type: 'Repetition',
      expression: _1,
      quantifier: _2
    }, __loc);
  }
}], [8, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = { kind: '^' };
}], [8, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = { kind: '$' };
}], [8, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = { kind: '\\b' };
}], [8, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = { kind: '\\B' };
}], [8, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = {
    kind: 'Lookahead',
    assertion: _2
  };
}], [8, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = {
    kind: 'Lookahead',
    negative: true,
    assertion: _2
  };
}], [8, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = {
    kind: 'Lookbehind',
    assertion: _2
  };
}], [8, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = {
    kind: 'Lookbehind',
    negative: true,
    assertion: _2
  };
}], [9, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [9, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [9, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'simple', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1.slice(1), 'simple', __loc);__.escaped = true;
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'unicode', __loc);__.isSurrogatePair = true;
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'unicode', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = UnicodeProperty(_1, __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'control', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'hex', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'oct', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = GroupRefOrDecChar(_1, __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'meta', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'meta', __loc);
}], [10, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = NamedGroupRefOrChars(_1, _1loc);
}], [11, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [11, 0], [12, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [12, 2, function (_1, _2, _1loc, _2loc) {
  __loc = yyloc(_1loc, _2loc);
  _1.greedy = false;
  __ = _1;
}], [13, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  __ = Node({
    type: 'Quantifier',
    kind: _1,
    greedy: true
  }, __loc);
}], [13, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  __ = Node({
    type: 'Quantifier',
    kind: _1,
    greedy: true
  }, __loc);
}], [13, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  __ = Node({
    type: 'Quantifier',
    kind: _1,
    greedy: true
  }, __loc);
}], [13, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  var range = getRange(_1);
  __ = Node({
    type: 'Quantifier',
    kind: 'Range',
    from: range[0],
    to: range[0],
    greedy: true
  }, __loc);
}], [13, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  __ = Node({
    type: 'Quantifier',
    kind: 'Range',
    from: getRange(_1)[0],
    greedy: true
  }, __loc);
}], [13, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);
  var range = getRange(_1);
  __ = Node({
    type: 'Quantifier',
    kind: 'Range',
    from: range[0],
    to: range[1],
    greedy: true
  }, __loc);
}], [14, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [14, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [15, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  if (namedGroups.hasOwnProperty(_1)) {
    throw new SyntaxError('Duplicate of the named group "' + _1 + '".');
  }

  var name = String(_1);

  namedGroups[name] = _1.groupNumber;

  __ = Node({
    type: 'Group',
    capturing: true,
    name: name,
    number: _1.groupNumber,
    expression: _2
  }, __loc);
}], [15, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = Node({
    type: 'Group',
    capturing: true,
    number: _1.groupNumber,
    expression: _2
  }, __loc);
}], [16, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = Node({
    type: 'Group',
    capturing: false,
    expression: _2
  }, __loc);
}], [17, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = Node({
    type: 'CharacterClass',
    negative: true,
    expressions: _2
  }, __loc);
}], [17, 3, function (_1, _2, _3, _1loc, _2loc, _3loc) {
  __loc = yyloc(_1loc, _3loc);
  __ = Node({
    type: 'CharacterClass',
    expressions: _2
  }, __loc);
}], [18, 0, function () {
  __loc = null;__ = [];
}], [18, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [19, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = [_1];
}], [19, 2, function (_1, _2, _1loc, _2loc) {
  __loc = yyloc(_1loc, _2loc);__ = [_1].concat(_2);
}], [19, 4, function (_1, _2, _3, _4, _1loc, _2loc, _3loc, _4loc) {
  __loc = yyloc(_1loc, _4loc);
  checkClassRange(_1, _3);

  __ = [Node({
    type: 'ClassRange',
    from: _1,
    to: _3
  }, loc(_1loc, _3loc))];

  if (_4) {
    __ = __.concat(_4);
  }
}], [20, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [20, 2, function (_1, _2, _1loc, _2loc) {
  __loc = yyloc(_1loc, _2loc);__ = [_1].concat(_2);
}], [20, 4, function (_1, _2, _3, _4, _1loc, _2loc, _3loc, _4loc) {
  __loc = yyloc(_1loc, _4loc);
  checkClassRange(_1, _3);

  __ = [Node({
    type: 'ClassRange',
    from: _1,
    to: _3
  }, loc(_1loc, _3loc))];

  if (_4) {
    __ = __.concat(_4);
  }
}], [21, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'simple', __loc);
}], [21, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [22, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = _1;
}], [22, 1, function (_1, _1loc) {
  __loc = yyloc(_1loc, _1loc);__ = Char(_1, 'meta', __loc);
}]];

/**
 * Encoded tokens map.
 */
var tokens = { "SLASH": "23", "CHAR": "24", "BAR": "25", "BOS": "26", "EOS": "27", "ESC_b": "28", "ESC_B": "29", "POS_LA_ASSERT": "30", "R_PAREN": "31", "NEG_LA_ASSERT": "32", "POS_LB_ASSERT": "33", "NEG_LB_ASSERT": "34", "ESC_CHAR": "35", "U_CODE_SURROGATE": "36", "U_CODE": "37", "U_PROP_VALUE_EXP": "38", "CTRL_CH": "39", "HEX_CODE": "40", "OCT_CODE": "41", "DEC_CODE": "42", "META_CHAR": "43", "ANY": "44", "NAMED_GROUP_REF": "45", "Q_MARK": "46", "STAR": "47", "PLUS": "48", "RANGE_EXACT": "49", "RANGE_OPEN": "50", "RANGE_CLOSED": "51", "NAMED_CAPTURE_GROUP": "52", "L_PAREN": "53", "NON_CAPTURE_GROUP": "54", "NEG_CLASS": "55", "R_BRACKET": "56", "L_BRACKET": "57", "DASH": "58", "$": "59" };

/**
 * Parsing table (generated by Syntax tool).
 */
var table = [{ "0": 1, "23": "s2" }, { "59": "acc" }, { "3": 3, "4": 4, "5": 5, "6": 6, "23": "r10", "24": "r10", "25": "r10", "26": "r10", "27": "r10", "28": "r10", "29": "r10", "30": "r10", "32": "r10", "33": "r10", "34": "r10", "35": "r10", "36": "r10", "37": "r10", "38": "r10", "39": "r10", "40": "r10", "41": "r10", "42": "r10", "43": "r10", "44": "r10", "45": "r10", "52": "r10", "53": "r10", "54": "r10", "55": "r10", "57": "r10" }, { "23": "s7" }, { "23": "r6", "25": "s12" }, { "23": "r7", "25": "r7", "31": "r7" }, { "7": 14, "8": 15, "9": 16, "10": 25, "14": 27, "15": 42, "16": 43, "17": 26, "23": "r9", "24": "s28", "25": "r9", "26": "s17", "27": "s18", "28": "s19", "29": "s20", "30": "s21", "31": "r9", "32": "s22", "33": "s23", "34": "s24", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "52": "s44", "53": "s45", "54": "s46", "55": "s40", "57": "s41" }, { "1": 8, "2": 9, "24": "s10", "59": "r3" }, { "59": "r1" }, { "24": "s11", "59": "r2" }, { "24": "r4", "59": "r4" }, { "24": "r5", "59": "r5" }, { "5": 13, "6": 6, "23": "r10", "24": "r10", "25": "r10", "26": "r10", "27": "r10", "28": "r10", "29": "r10", "30": "r10", "31": "r10", "32": "r10", "33": "r10", "34": "r10", "35": "r10", "36": "r10", "37": "r10", "38": "r10", "39": "r10", "40": "r10", "41": "r10", "42": "r10", "43": "r10", "44": "r10", "45": "r10", "52": "r10", "53": "r10", "54": "r10", "55": "r10", "57": "r10" }, { "23": "r8", "25": "r8", "31": "r8" }, { "23": "r11", "24": "r11", "25": "r11", "26": "r11", "27": "r11", "28": "r11", "29": "r11", "30": "r11", "31": "r11", "32": "r11", "33": "r11", "34": "r11", "35": "r11", "36": "r11", "37": "r11", "38": "r11", "39": "r11", "40": "r11", "41": "r11", "42": "r11", "43": "r11", "44": "r11", "45": "r11", "52": "r11", "53": "r11", "54": "r11", "55": "r11", "57": "r11" }, { "23": "r12", "24": "r12", "25": "r12", "26": "r12", "27": "r12", "28": "r12", "29": "r12", "30": "r12", "31": "r12", "32": "r12", "33": "r12", "34": "r12", "35": "r12", "36": "r12", "37": "r12", "38": "r12", "39": "r12", "40": "r12", "41": "r12", "42": "r12", "43": "r12", "44": "r12", "45": "r12", "52": "r12", "53": "r12", "54": "r12", "55": "r12", "57": "r12" }, { "11": 47, "12": 48, "13": 49, "23": "r38", "24": "r38", "25": "r38", "26": "r38", "27": "r38", "28": "r38", "29": "r38", "30": "r38", "31": "r38", "32": "r38", "33": "r38", "34": "r38", "35": "r38", "36": "r38", "37": "r38", "38": "r38", "39": "r38", "40": "r38", "41": "r38", "42": "r38", "43": "r38", "44": "r38", "45": "r38", "46": "s52", "47": "s50", "48": "s51", "49": "s53", "50": "s54", "51": "s55", "52": "r38", "53": "r38", "54": "r38", "55": "r38", "57": "r38" }, { "23": "r14", "24": "r14", "25": "r14", "26": "r14", "27": "r14", "28": "r14", "29": "r14", "30": "r14", "31": "r14", "32": "r14", "33": "r14", "34": "r14", "35": "r14", "36": "r14", "37": "r14", "38": "r14", "39": "r14", "40": "r14", "41": "r14", 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"27": "r45", "28": "r45", "29": "r45", "30": "r45", "31": "r45", "32": "r45", "33": "r45", "34": "r45", "35": "r45", "36": "r45", "37": "r45", "38": "r45", "39": "r45", "40": "r45", "41": "r45", "42": "r45", "43": "r45", "44": "r45", "45": "r45", "46": "r45", "52": "r45", "53": "r45", "54": "r45", "55": "r45", "57": "r45" }, { "23": "r46", "24": "r46", "25": "r46", "26": "r46", "27": "r46", "28": "r46", "29": "r46", "30": "r46", "31": "r46", "32": "r46", "33": "r46", "34": "r46", "35": "r46", "36": "r46", "37": "r46", "38": "r46", "39": "r46", "40": "r46", "41": "r46", "42": "r46", "43": "r46", "44": "r46", "45": "r46", "46": "r46", "52": "r46", "53": "r46", "54": "r46", "55": "r46", "57": "r46" }, { "23": "r40", "24": "r40", "25": "r40", "26": "r40", "27": "r40", "28": "r40", "29": "r40", "30": "r40", "31": "r40", "32": "r40", "33": "r40", "34": "r40", "35": "r40", "36": "r40", "37": "r40", "38": "r40", "39": "r40", "40": "r40", "41": "r40", "42": "r40", "43": "r40", "44": "r40", "45": "r40", "52": "r40", "53": "r40", "54": "r40", "55": "r40", "57": "r40" }, { "25": "s12", "31": "s58" }, { "23": "r18", "24": "r18", "25": "r18", "26": "r18", "27": "r18", "28": "r18", "29": "r18", "30": "r18", "31": "r18", "32": "r18", "33": "r18", "34": "r18", "35": "r18", "36": "r18", "37": "r18", "38": "r18", "39": "r18", "40": "r18", "41": "r18", "42": "r18", "43": "r18", "44": "r18", "45": "r18", "52": "r18", "53": "r18", "54": "r18", "55": "r18", "57": "r18" }, { "25": "s12", "31": "s60" }, { "23": "r19", "24": "r19", "25": "r19", "26": "r19", "27": "r19", "28": "r19", "29": "r19", "30": "r19", "31": "r19", "32": "r19", "33": "r19", "34": "r19", "35": "r19", "36": "r19", "37": "r19", "38": "r19", "39": "r19", "40": "r19", "41": "r19", "42": "r19", "43": "r19", "44": "r19", "45": "r19", "52": "r19", "53": "r19", "54": "r19", "55": "r19", "57": "r19" }, { "25": "s12", "31": "s62" }, { "23": "r20", "24": "r20", "25": "r20", "26": "r20", "27": "r20", "28": "r20", "29": "r20", "30": "r20", "31": "r20", "32": "r20", "33": "r20", "34": "r20", "35": "r20", "36": "r20", "37": "r20", "38": "r20", "39": "r20", "40": "r20", "41": "r20", "42": "r20", "43": "r20", "44": "r20", "45": "r20", "52": "r20", "53": "r20", "54": "r20", "55": "r20", "57": "r20" }, { "25": "s12", "31": "s64" }, { "23": "r21", "24": "r21", "25": "r21", "26": "r21", "27": "r21", "28": "r21", "29": "r21", "30": "r21", "31": "r21", "32": "r21", "33": "r21", "34": "r21", "35": "r21", "36": "r21", "37": "r21", "38": "r21", "39": "r21", "40": "r21", "41": "r21", "42": "r21", "43": "r21", "44": "r21", "45": "r21", "52": "r21", "53": "r21", "54": "r21", "55": "r21", "57": "r21" }, { "56": "s72" }, { "56": "r55" }, { "10": 70, "20": 73, "21": 75, "22": 76, "24": "s28", "28": "s71", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "56": "r56", "58": "s74" }, { "24": "r62", "28": "r62", "35": "r62", "36": "r62", "37": "r62", "38": "r62", "39": "r62", "40": "r62", "41": "r62", "42": "r62", "43": "r62", "44": "r62", "45": "r62", "56": "r62", "58": "r62" }, { "24": "r63", "28": "r63", "35": "r63", "36": "r63", "37": "r63", "38": "r63", "39": "r63", "40": "r63", "41": "r63", "42": "r63", "43": "r63", "44": "r63", "45": "r63", "56": "r63", "58": "r63" }, { "24": "r64", "28": "r64", "35": "r64", "36": "r64", "37": "r64", "38": "r64", "39": "r64", "40": "r64", "41": "r64", "42": "r64", "43": "r64", "44": "r64", "45": "r64", "56": "r64", "58": "r64" }, { "24": "r65", "28": "r65", "35": "r65", "36": "r65", "37": "r65", "38": "r65", "39": "r65", "40": "r65", "41": "r65", "42": "r65", "43": "r65", "44": "r65", "45": "r65", "56": "r65", "58": "r65" }, { "23": "r52", "24": "r52", "25": "r52", "26": "r52", "27": "r52", "28": "r52", "29": "r52", "30": "r52", "31": "r52", "32": "r52", "33": "r52", "34": "r52", "35": "r52", "36": "r52", "37": "r52", "38": "r52", "39": "r52", "40": "r52", "41": "r52", "42": "r52", "43": "r52", "44": "r52", "45": "r52", "46": "r52", "47": "r52", "48": "r52", "49": "r52", "50": "r52", "51": "r52", "52": "r52", "53": "r52", "54": "r52", "55": "r52", "57": "r52" }, { "56": "r57" }, { "10": 70, "21": 77, "22": 69, "24": "s28", "28": "s71", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "56": "r62", "58": "s68" }, { "56": "r59" }, { "10": 70, "20": 79, "21": 75, "22": 76, "24": "s28", "28": "s71", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "56": "r63", "58": "s80" }, { "10": 70, "18": 78, "19": 66, "21": 67, "22": 69, "24": "s28", "28": "s71", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "56": "r54", "58": "s68" }, { "56": "r58" }, { "56": "r60" }, { "10": 70, "21": 81, "22": 69, "24": "s28", "28": "s71", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "56": "r62", "58": "s68" }, { "10": 70, "18": 82, "19": 66, "21": 67, "22": 69, "24": "s28", "28": "s71", "35": "s29", "36": "s30", "37": "s31", "38": "s32", "39": "s33", "40": "s34", "41": "s35", "42": "s36", "43": "s37", "44": "s38", "45": "s39", "56": "r54", "58": "s68" }, { "56": "r61" }, { "56": "s84" }, { "23": "r53", "24": "r53", "25": "r53", "26": "r53", "27": "r53", "28": "r53", "29": "r53", "30": "r53", "31": "r53", "32": "r53", "33": "r53", "34": "r53", "35": "r53", "36": "r53", "37": "r53", "38": "r53", "39": "r53", "40": "r53", "41": "r53", "42": "r53", "43": "r53", "44": "r53", "45": "r53", "46": "r53", "47": "r53", "48": "r53", "49": "r53", "50": "r53", "51": "r53", "52": "r53", "53": "r53", "54": "r53", "55": "r53", "57": "r53" }, { "25": "s12", "31": "s86" }, { "23": "r49", "24": "r49", "25": "r49", "26": "r49", "27": "r49", "28": "r49", "29": "r49", "30": "r49", "31": "r49", "32": "r49", "33": "r49", "34": "r49", "35": "r49", "36": "r49", "37": "r49", "38": "r49", "39": "r49", "40": "r49", "41": "r49", "42": "r49", "43": "r49", "44": "r49", "45": "r49", "46": "r49", "47": "r49", "48": "r49", "49": "r49", "50": "r49", "51": "r49", "52": "r49", "53": "r49", "54": "r49", "55": "r49", "57": "r49" }, { "25": "s12", "31": "s88" }, { "23": "r50", "24": "r50", "25": "r50", "26": "r50", "27": "r50", "28": "r50", "29": "r50", "30": "r50", "31": "r50", "32": "r50", "33": "r50", "34": "r50", "35": "r50", "36": "r50", "37": "r50", "38": "r50", "39": "r50", "40": "r50", "41": "r50", "42": "r50", "43": "r50", "44": "r50", "45": "r50", "46": "r50", "47": "r50", "48": "r50", "49": "r50", "50": "r50", "51": "r50", "52": "r50", "53": "r50", "54": "r50", "55": "r50", "57": "r50" }, { "25": "s12", "31": "s90" }, { "23": "r51", "24": "r51", "25": "r51", "26": "r51", "27": "r51", "28": "r51", "29": "r51", "30": "r51", "31": "r51", "32": "r51", "33": "r51", "34": "r51", "35": "r51", "36": "r51", "37": "r51", "38": "r51", "39": "r51", "40": "r51", "41": "r51", "42": "r51", "43": "r51", "44": "r51", "45": "r51", "46": "r51", "47": "r51", "48": "r51", "49": "r51", "50": "r51", "51": "r51", "52": "r51", "53": "r51", "54": "r51", "55": "r51", "57": "r51" }];

/**
 * Parsing stack.
 */
var stack = [];

/**
 * Tokenizer instance.
 */
var tokenizer = void 0;
/**
 * Generic tokenizer used by the parser in the Syntax tool.
 *
 * https://www.npmjs.com/package/syntax-cli
 *
 * See `--custom-tokinzer` to skip this generation, and use a custom one.
 */

var lexRules = [[/^#[^\n]+/, function () {/* skip comments */}], [/^\s+/, function () {/* skip whitespace */}], [/^\\-/, function () {
  return 'ESC_CHAR';
}], [/^-/, function () {
  return 'DASH';
}], [/^\//, function () {
  return 'CHAR';
}], [/^#/, function () {
  return 'CHAR';
}], [/^\|/, function () {
  return 'CHAR';
}], [/^\./, function () {
  return 'CHAR';
}], [/^\{/, function () {
  return 'CHAR';
}], [/^\{\d+\}/, function () {
  return 'RANGE_EXACT';
}], [/^\{\d+,\}/, function () {
  return 'RANGE_OPEN';
}], [/^\{\d+,\d+\}/, function () {
  return 'RANGE_CLOSED';
}], [/^\\k<([\w$]|\\u[0-9a-fA-F]{4}|\\u\{[0-9a-fA-F]{1,}\})+>/, function () {
  var groupName = yytext.slice(3, -1);
  validateUnicodeGroupName(groupName, this.getCurrentState());
  return 'NAMED_GROUP_REF';
}], [/^\\b/, function () {
  return 'ESC_b';
}], [/^\\B/, function () {
  return 'ESC_B';
}], [/^\\c[a-zA-Z]/, function () {
  return 'CTRL_CH';
}], [/^\\0\d{1,2}/, function () {
  return 'OCT_CODE';
}], [/^\\0/, function () {
  return 'DEC_CODE';
}], [/^\\\d{1,3}/, function () {
  return 'DEC_CODE';
}], [/^\\u[dD][89abAB][0-9a-fA-F]{2}\\u[dD][c-fC-F][0-9a-fA-F]{2}/, function () {
  return 'U_CODE_SURROGATE';
}], [/^\\u\{[0-9a-fA-F]{1,}\}/, function () {
  return 'U_CODE';
}], [/^\\u[0-9a-fA-F]{4}/, function () {
  return 'U_CODE';
}], [/^\\[pP]\{\w+(?:=\w+)?\}/, function () {
  return 'U_PROP_VALUE_EXP';
}], [/^\\x[0-9a-fA-F]{2}/, function () {
  return 'HEX_CODE';
}], [/^\\[tnrdDsSwWvf]/, function () {
  return 'META_CHAR';
}], [/^\\\//, function () {
  return 'ESC_CHAR';
}], [/^\\[ #]/, function () {
  return 'ESC_CHAR';
}], [/^\\[^*?+\[()\\|]/, function () {
  var s = this.getCurrentState();
  if (s === 'u' || s === 'xu' || s === 'u_class') {
    throw new SyntaxError('invalid Unicode escape ' + yytext);
  }
  return 'ESC_CHAR';
}], [/^\\[*?+\[()\\|]/, function () {
  return 'ESC_CHAR';
}], [/^\(/, function () {
  return 'CHAR';
}], [/^\)/, function () {
  return 'CHAR';
}], [/^\(\?=/, function () {
  return 'POS_LA_ASSERT';
}], [/^\(\?!/, function () {
  return 'NEG_LA_ASSERT';
}], [/^\(\?<=/, function () {
  return 'POS_LB_ASSERT';
}], [/^\(\?<!/, function () {
  return 'NEG_LB_ASSERT';
}], [/^\(\?:/, function () {
  return 'NON_CAPTURE_GROUP';
}], [/^\(\?<([\w$]|\\u[0-9a-fA-F]{4}|\\u\{[0-9a-fA-F]{1,}\})+>/, function () {
  yytext = yytext.slice(3, -1);
  validateUnicodeGroupName(yytext, this.getCurrentState());
  return 'NAMED_CAPTURE_GROUP';
}], [/^\(/, function () {
  return 'L_PAREN';
}], [/^\)/, function () {
  return 'R_PAREN';
}], [/^[*?+[^$]/, function () {
  return 'CHAR';
}], [/^\\\]/, function () {
  return 'ESC_CHAR';
}], [/^\]/, function () {
  this.popState();return 'R_BRACKET';
}], [/^\^/, function () {
  return 'BOS';
}], [/^\$/, function () {
  return 'EOS';
}], [/^\*/, function () {
  return 'STAR';
}], [/^\?/, function () {
  return 'Q_MARK';
}], [/^\+/, function () {
  return 'PLUS';
}], [/^\|/, function () {
  return 'BAR';
}], [/^\./, function () {
  return 'ANY';
}], [/^\//, function () {
  return 'SLASH';
}], [/^[^*?+\[()\\|]/, function () {
  return 'CHAR';
}], [/^\[\^/, function () {
  var s = this.getCurrentState();this.pushState(s === 'u' || s === 'xu' ? 'u_class' : 'class');return 'NEG_CLASS';
}], [/^\[/, function () {
  var s = this.getCurrentState();this.pushState(s === 'u' || s === 'xu' ? 'u_class' : 'class');return 'L_BRACKET';
}]];
var lexRulesByConditions = { "INITIAL": [9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 23, 24, 25, 27, 28, 31, 32, 33, 34, 35, 36, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52], "u": [9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 31, 32, 33, 34, 35, 36, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52], "xu": [0, 1, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 35, 36, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52], "x": [0, 1, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 23, 24, 25, 27, 28, 31, 32, 33, 34, 35, 36, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52], "u_class": [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52], "class": [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52] };

var EOF_TOKEN = {
  type: EOF,
  value: ''
};

tokenizer = {
  initString: function initString(string) {
    this._string = string;
    this._cursor = 0;

    this._states = ['INITIAL'];
    this._tokensQueue = [];

    this._currentLine = 1;
    this._currentColumn = 0;
    this._currentLineBeginOffset = 0;

    /**
     * Matched token location data.
     */
    this._tokenStartOffset = 0;
    this._tokenEndOffset = 0;
    this._tokenStartLine = 1;
    this._tokenEndLine = 1;
    this._tokenStartColumn = 0;
    this._tokenEndColumn = 0;

    return this;
  },


  /**
   * Returns tokenizer states.
   */
  getStates: function getStates() {
    return this._states;
  },
  getCurrentState: function getCurrentState() {
    return this._states[this._states.length - 1];
  },
  pushState: function pushState(state) {
    this._states.push(state);
  },
  begin: function begin(state) {
    this.pushState(state);
  },
  popState: function popState() {
    if (this._states.length > 1) {
      return this._states.pop();
    }
    return this._states[0];
  },
  getNextToken: function getNextToken() {
    // Something was queued, return it.
    if (this._tokensQueue.length > 0) {
      return this.onToken(this._toToken(this._tokensQueue.shift()));
    }

    if (!this.hasMoreTokens()) {
      return this.onToken(EOF_TOKEN);
    }

    var string = this._string.slice(this._cursor);
    var lexRulesForState = lexRulesByConditions[this.getCurrentState()];

    for (var i = 0; i < lexRulesForState.length; i++) {
      var lexRuleIndex = lexRulesForState[i];
      var lexRule = lexRules[lexRuleIndex];

      var matched = this._match(string, lexRule[0]);

      // Manual handling of EOF token (the end of string). Return it
      // as `EOF` symbol.
      if (string === '' && matched === '') {
        this._cursor++;
      }

      if (matched !== null) {
        yytext = matched;
        yyleng = yytext.length;
        var token = lexRule[1].call(this);

        if (!token) {
          return this.getNextToken();
        }

        // If multiple tokens are returned, save them to return
        // on next `getNextToken` call.

        if (Array.isArray(token)) {
          var tokensToQueue = token.slice(1);
          token = token[0];
          if (tokensToQueue.length > 0) {
            var _tokensQueue;

            (_tokensQueue = this._tokensQueue).unshift.apply(_tokensQueue, _toConsumableArray(tokensToQueue));
          }
        }

        return this.onToken(this._toToken(token, yytext));
      }
    }

    if (this.isEOF()) {
      this._cursor++;
      return EOF_TOKEN;
    }

    this.throwUnexpectedToken(string[0], this._currentLine, this._currentColumn);
  },


  /**
   * Throws default "Unexpected token" exception, showing the actual
   * line from the source, pointing with the ^ marker to the bad token.
   * In addition, shows `line:column` location.
   */
  throwUnexpectedToken: function throwUnexpectedToken(symbol, line, column) {
    var lineSource = this._string.split('\n')[line - 1];
    var lineData = '';

    if (lineSource) {
      var pad = ' '.repeat(column);
      lineData = '\n\n' + lineSource + '\n' + pad + '^\n';
    }

    throw new SyntaxError(lineData + 'Unexpected token: "' + symbol + '" ' + ('at ' + line + ':' + column + '.'));
  },
  getCursor: function getCursor() {
    return this._cursor;
  },
  getCurrentLine: function getCurrentLine() {
    return this._currentLine;
  },
  getCurrentColumn: function getCurrentColumn() {
    return this._currentColumn;
  },
  _captureLocation: function _captureLocation(matched) {
    var nlRe = /\n/g;

    // Absolute offsets.
    this._tokenStartOffset = this._cursor;

    // Line-based locations, start.
    this._tokenStartLine = this._currentLine;
    this._tokenStartColumn = this._tokenStartOffset - this._currentLineBeginOffset;

    // Extract `\n` in the matched token.
    var nlMatch = void 0;
    while ((nlMatch = nlRe.exec(matched)) !== null) {
      this._currentLine++;
      this._currentLineBeginOffset = this._tokenStartOffset + nlMatch.index + 1;
    }

    this._tokenEndOffset = this._cursor + matched.length;

    // Line-based locations, end.
    this._tokenEndLine = this._currentLine;
    this._tokenEndColumn = this._currentColumn = this._tokenEndOffset - this._currentLineBeginOffset;
  },
  _toToken: function _toToken(tokenType) {
    var yytext = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';

    return {
      // Basic data.
      type: tokenType,
      value: yytext,

      // Location data.
      startOffset: this._tokenStartOffset,
      endOffset: this._tokenEndOffset,
      startLine: this._tokenStartLine,
      endLine: this._tokenEndLine,
      startColumn: this._tokenStartColumn,
      endColumn: this._tokenEndColumn
    };
  },
  isEOF: function isEOF() {
    return this._cursor === this._string.length;
  },
  hasMoreTokens: function hasMoreTokens() {
    return this._cursor <= this._string.length;
  },
  _match: function _match(string, regexp) {
    var matched = string.match(regexp);
    if (matched) {
      // Handle `\n` in the matched token to track line numbers.
      this._captureLocation(matched[0]);
      this._cursor += matched[0].length;
      return matched[0];
    }
    return null;
  },


  /**
   * Allows analyzing, and transforming token. Default implementation
   * just passes the token through.
   */
  onToken: function onToken(token) {
    return token;
  }
};

/**
 * Expose tokenizer so it can be accessed in semantic actions.
 */
yy.lexer = tokenizer;
yy.tokenizer = tokenizer;

/**
 * Global parsing options. Some options can be shadowed per
 * each `parse` call, if the optations are passed.
 *
 * Initalized to the `captureLocations` which is passed
 * from the generator. Other options can be added at runtime.
 */
yy.options = {
  captureLocations: true
};

/**
 * Parsing module.
 */
var yyparse = {
  /**
   * Sets global parsing options.
   */
  setOptions: function setOptions(options) {
    yy.options = options;
    return this;
  },


  /**
   * Returns parsing options.
   */
  getOptions: function getOptions() {
    return yy.options;
  },


  /**
   * Parses a string.
   */
  parse: function parse(string, parseOptions) {
    if (!tokenizer) {
      throw new Error('Tokenizer instance wasn\'t specified.');
    }

    tokenizer.initString(string);

    /**
     * If parse options are passed, override global parse options for
     * this call, and later restore global options.
     */
    var globalOptions = yy.options;
    if (parseOptions) {
      yy.options = Object.assign({}, yy.options, parseOptions);
    }

    /**
     * Allow callers to do setup work based on the
     * parsing string, and passed options.
     */
    yyparse.onParseBegin(string, tokenizer, yy.options);

    stack.length = 0;
    stack.push(0);

    var token = tokenizer.getNextToken();
    var shiftedToken = null;

    do {
      if (!token) {
        // Restore options.
        yy.options = globalOptions;
        unexpectedEndOfInput();
      }

      var state = stack[stack.length - 1];
      var column = tokens[token.type];

      if (!table[state].hasOwnProperty(column)) {
        yy.options = globalOptions;
        unexpectedToken(token);
      }

      var entry = table[state][column];

      // Shift action.
      if (entry[0] === 's') {
        var _loc2 = null;

        if (yy.options.captureLocations) {
          _loc2 = {
            startOffset: token.startOffset,
            endOffset: token.endOffset,
            startLine: token.startLine,
            endLine: token.endLine,
            startColumn: token.startColumn,
            endColumn: token.endColumn
          };
        }

        shiftedToken = this.onShift(token);

        stack.push({ symbol: tokens[shiftedToken.type], semanticValue: shiftedToken.value, loc: _loc2 }, Number(entry.slice(1)));

        token = tokenizer.getNextToken();
      }

      // Reduce action.
      else if (entry[0] === 'r') {
          var productionNumber = entry.slice(1);
          var production = productions[productionNumber];
          var hasSemanticAction = typeof production[2] === 'function';
          var semanticValueArgs = hasSemanticAction ? [] : null;

          var locationArgs = hasSemanticAction && yy.options.captureLocations ? [] : null;

          if (production[1] !== 0) {
            var rhsLength = production[1];
            while (rhsLength-- > 0) {
              stack.pop();
              var stackEntry = stack.pop();

              if (hasSemanticAction) {
                semanticValueArgs.unshift(stackEntry.semanticValue);

                if (locationArgs) {
                  locationArgs.unshift(stackEntry.loc);
                }
              }
            }
          }

          var reduceStackEntry = { symbol: production[0] };

          if (hasSemanticAction) {
            yytext = shiftedToken ? shiftedToken.value : null;
            yyleng = shiftedToken ? shiftedToken.value.length : null;

            var semanticActionArgs = locationArgs !== null ? semanticValueArgs.concat(locationArgs) : semanticValueArgs;

            production[2].apply(production, _toConsumableArray(semanticActionArgs));

            reduceStackEntry.semanticValue = __;

            if (locationArgs) {
              reduceStackEntry.loc = __loc;
            }
          }

          var nextState = stack[stack.length - 1];
          var symbolToReduceWith = production[0];

          stack.push(reduceStackEntry, table[nextState][symbolToReduceWith]);
        }

        // Accept.
        else if (entry === 'acc') {
            stack.pop();
            var parsed = stack.pop();

            if (stack.length !== 1 || stack[0] !== 0 || tokenizer.hasMoreTokens()) {
              // Restore options.
              yy.options = globalOptions;
              unexpectedToken(token);
            }

            if (parsed.hasOwnProperty('semanticValue')) {
              yy.options = globalOptions;
              yyparse.onParseEnd(parsed.semanticValue);
              return parsed.semanticValue;
            }

            yyparse.onParseEnd();

            // Restore options.
            yy.options = globalOptions;
            return true;
          }
    } while (tokenizer.hasMoreTokens() || stack.length > 1);
  },
  setTokenizer: function setTokenizer(customTokenizer) {
    tokenizer = customTokenizer;
    return yyparse;
  },
  getTokenizer: function getTokenizer() {
    return tokenizer;
  },
  onParseBegin: function onParseBegin(string, tokenizer, options) {},
  onParseEnd: function onParseEnd(parsed) {},


  /**
   * Allows analyzing, and transforming shifted token. Default implementation
   * just passes the token through.
   */
  onShift: function onShift(token) {
    return token;
  }
};

/**
 * Tracks capturing groups.
 */
var capturingGroupsCount = 0;

/**
 * Tracks named groups.
 */
var namedGroups = {};

/**
 * Parsing string.
 */
var parsingString = '';

yyparse.onParseBegin = function (string, lexer) {
  parsingString = string;
  capturingGroupsCount = 0;
  namedGroups = {};

  var lastSlash = string.lastIndexOf('/');
  var flags = string.slice(lastSlash);

  if (flags.includes('x') && flags.includes('u')) {
    lexer.pushState('xu');
  } else {
    if (flags.includes('x')) {
      lexer.pushState('x');
    }
    if (flags.includes('u')) {
      lexer.pushState('u');
    }
  }
};

/**
 * On shifting `(` remember its number to used on reduce.
 */
yyparse.onShift = function (token) {
  if (token.type === 'L_PAREN' || token.type === 'NAMED_CAPTURE_GROUP') {
    token.value = new String(token.value);
    token.value.groupNumber = ++capturingGroupsCount;
  }
  return token;
};

/**
 * Extracts ranges from the range string.
 */
function getRange(text) {
  var range = text.match(/\d+/g).map(Number);

  if (Number.isFinite(range[1]) && range[1] < range[0]) {
    throw new SyntaxError('Numbers out of order in ' + text + ' quantifier');
  }

  return range;
}

/**
 * Checks class range
 */
function checkClassRange(from, to) {
  if (from.kind === 'control' || to.kind === 'control' || !isNaN(from.codePoint) && !isNaN(to.codePoint) && from.codePoint > to.codePoint) {
    throw new SyntaxError('Range ' + from.value + '-' + to.value + ' out of order in character class');
  }
}

// ---------------------- Unicode property -------------------------------------------

var unicodeProperties = require('../unicode/parser-unicode-properties.js');

/**
 * Unicode property.
 */
function UnicodeProperty(matched, loc) {
  var negative = matched[1] === 'P';
  var separatorIdx = matched.indexOf('=');

  var name = matched.slice(3, separatorIdx !== -1 ? separatorIdx : -1);
  var value = void 0;

  // General_Category allows using only value as a shorthand.
  var isShorthand = separatorIdx === -1 && unicodeProperties.isGeneralCategoryValue(name);

  // Binary propery name.
  var isBinaryProperty = separatorIdx === -1 && unicodeProperties.isBinaryPropertyName(name);

  if (isShorthand) {
    value = name;
    name = 'General_Category';
  } else if (isBinaryProperty) {
    value = name;
  } else {
    if (!unicodeProperties.isValidName(name)) {
      throw new SyntaxError('Invalid unicode property name: ' + name + '.');
    }

    value = matched.slice(separatorIdx + 1, -1);

    if (!unicodeProperties.isValidValue(name, value)) {
      throw new SyntaxError('Invalid ' + name + ' unicode property value: ' + value + '.');
    }
  }

  return Node({
    type: 'UnicodeProperty',
    name: name,
    value: value,
    negative: negative,
    shorthand: isShorthand,
    binary: isBinaryProperty,
    canonicalName: unicodeProperties.getCanonicalName(name) || name,
    canonicalValue: unicodeProperties.getCanonicalValue(value) || value
  }, loc);
}

// ----------------------------------------------------------------------------------


/**
 * Creates a character node.
 */
function Char(value, kind, loc) {
  var symbol = void 0;
  var codePoint = void 0;

  switch (kind) {
    case 'decimal':
      {
        codePoint = Number(value.slice(1));
        symbol = String.fromCodePoint(codePoint);
        break;
      }
    case 'oct':
      {
        codePoint = parseInt(value.slice(1), 8);
        symbol = String.fromCodePoint(codePoint);
        break;
      }
    case 'hex':
    case 'unicode':
      {
        if (value.lastIndexOf('\\u') > 0) {
          var _value$split$slice = value.split('\\u').slice(1),
              _value$split$slice2 = _slicedToArray(_value$split$slice, 2),
              lead = _value$split$slice2[0],
              trail = _value$split$slice2[1];

          lead = parseInt(lead, 16);
          trail = parseInt(trail, 16);
          codePoint = (lead - 0xd800) * 0x400 + (trail - 0xdc00) + 0x10000;

          symbol = String.fromCodePoint(codePoint);
        } else {
          var hex = value.slice(2).replace('{', '');
          codePoint = parseInt(hex, 16);
          if (codePoint > 0x10ffff) {
            throw new SyntaxError('Bad character escape sequence: ' + value);
          }

          symbol = String.fromCodePoint(codePoint);
        }
        break;
      }
    case 'meta':
      {
        switch (value) {
          case '\\t':
            symbol = '\t';
            codePoint = symbol.codePointAt(0);
            break;
          case '\\n':
            symbol = '\n';
            codePoint = symbol.codePointAt(0);
            break;
          case '\\r':
            symbol = '\r';
            codePoint = symbol.codePointAt(0);
            break;
          case '\\v':
            symbol = '\v';
            codePoint = symbol.codePointAt(0);
            break;
          case '\\f':
            symbol = '\f';
            codePoint = symbol.codePointAt(0);
            break;
          case '\\b':
            symbol = '\b';
            codePoint = symbol.codePointAt(0);
          case '\\0':
            symbol = '\0';
            codePoint = 0;
          case '.':
            symbol = '.';
            codePoint = NaN;
            break;
          default:
            codePoint = NaN;
        }
        break;
      }
    case 'simple':
      {
        symbol = value;
        codePoint = symbol.codePointAt(0);
        break;
      }
  }

  return Node({
    type: 'Char',
    value: value,
    kind: kind,
    symbol: symbol,
    codePoint: codePoint
  }, loc);
}

/**
 * Valid flags per current ECMAScript spec and
 * stage 3+ proposals.
 */
var validFlags = 'gimsuxy';

/**
 * Checks the flags are valid, and that
 * we don't duplicate flags.
 */
function checkFlags(flags) {
  var seen = new Set();

  var _iteratorNormalCompletion = true;
  var _didIteratorError = false;
  var _iteratorError = undefined;

  try {
    for (var _iterator = flags[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
      var flag = _step.value;

      if (seen.has(flag) || !validFlags.includes(flag)) {
        throw new SyntaxError('Invalid flags: ' + flags);
      }
      seen.add(flag);
    }
  } catch (err) {
    _didIteratorError = true;
    _iteratorError = err;
  } finally {
    try {
      if (!_iteratorNormalCompletion && _iterator.return) {
        _iterator.return();
      }
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }
  }

  return flags.split('').sort().join('');
}

/**
 * Parses patterns like \1, \2, etc. either as a backreference
 * to a group, or a deciaml char code.
 */
function GroupRefOrDecChar(text, textLoc) {
  var reference = Number(text.slice(1));

  if (reference > 0 && reference <= capturingGroupsCount) {
    return Node({
      type: 'Backreference',
      kind: 'number',
      number: reference,
      reference: reference
    }, textLoc);
  }

  return Char(text, 'decimal', textLoc);
}

/**
 * Unicode names.
 */
var uRe = /^\\u[0-9a-fA-F]{4}/;
var ucpRe = /^\\u\{[0-9a-fA-F]{1,}\}/;

/**
 * Validates Unicode group name.
 */
function validateUnicodeGroupName(name, state) {
  var isUnicodeName = uRe.test(name) || ucpRe.test(name);
  var isUnicodeState = state === 'u' || state === 'xu' || state === 'u_class';

  if (isUnicodeName && !isUnicodeState) {
    throw new SyntaxError('invalid group Unicode name "' + name + '", use `u` flag.');
  }
}

/**
 * Extracts from `\k<foo>` pattern either a backreference
 * to a named capturing group (if it presents), or parses it
 * as a list of char: `\k`, `<`, `f`, etc.
 */
function NamedGroupRefOrChars(text, textLoc) {
  var groupName = text.slice(3, -1);

  if (namedGroups.hasOwnProperty(groupName)) {
    return Node({
      type: 'Backreference',
      kind: 'name',
      number: namedGroups[groupName],
      reference: groupName
    }, textLoc);
  }

  // Else `\k<foo>` should be parsed as a list of `Char`s.
  // This is really a 0.01% edge case, but we should handle it.

  var startOffset = null;
  var startLine = null;
  var endLine = null;
  var startColumn = null;

  if (textLoc) {
    startOffset = textLoc.startOffset;
    startLine = textLoc.startLine;
    endLine = textLoc.endLine;
    startColumn = textLoc.startColumn;
  }

  var charRe = /^[\w$<>]/;
  var loc = void 0;

  var chars = [
  // Init to first \k, taking 2 symbols.
  Char(text.slice(1, 2), 'simple', startOffset ? {
    startLine: startLine,
    endLine: endLine,
    startColumn: startColumn,
    startOffset: startOffset,
    endOffset: startOffset += 2,
    endColumn: startColumn += 2
  } : null)];

  // For \k
  chars[0].escaped = true;

  // Other symbols.
  text = text.slice(2);

  while (text.length > 0) {
    var matched = null;

    // Unicode, \u003B or \u{003B}
    if ((matched = text.match(uRe)) || (matched = text.match(ucpRe))) {
      if (startOffset) {
        loc = {
          startLine: startLine,
          endLine: endLine,
          startColumn: startColumn,
          startOffset: startOffset,
          endOffset: startOffset += matched[0].length,
          endColumn: startColumn += matched[0].length
        };
      }
      chars.push(Char(matched[0], 'unicode', loc));
      text = text.slice(matched[0].length);
    }

    // Simple char.
    else if (matched = text.match(charRe)) {
        if (startOffset) {
          loc = {
            startLine: startLine,
            endLine: endLine,
            startColumn: startColumn,
            startOffset: startOffset,
            endOffset: ++startOffset,
            endColumn: ++startColumn
          };
        }
        chars.push(Char(matched[0], 'simple', loc));
        text = text.slice(1);
      }
  }

  return chars;
}

/**
 * Creates an AST node with a location.
 */
function Node(node, loc) {
  if (yy.options.captureLocations) {
    node.loc = {
      source: parsingString.slice(loc.startOffset, loc.endOffset),
      start: {
        line: loc.startLine,
        column: loc.startColumn,
        offset: loc.startOffset
      },
      end: {
        line: loc.endLine,
        column: loc.endColumn,
        offset: loc.endOffset
      }
    };
  }
  return node;
}

/**
 * Creates location node.
 */
function loc(start, end) {
  if (!yy.options.captureLocations) {
    return null;
  }

  return {
    startOffset: start.startOffset,
    endOffset: end.endOffset,
    startLine: start.startLine,
    endLine: end.endLine,
    startColumn: start.startColumn,
    endColumn: end.endColumn
  };
}

function unexpectedToken(token) {
  if (token.type === EOF) {
    unexpectedEndOfInput();
  }

  tokenizer.throwUnexpectedToken(token.value, token.startLine, token.startColumn);
}

function unexpectedEndOfInput() {
  parseError('Unexpected end of input.');
}

function parseError(message) {
  throw new SyntaxError(message);
}

module.exports = yyparse;