Fix.

node_modules/braces/lib/braces.js

@@ -0,0 +1,104 @@
+'use strict';
+
+var extend = require('extend-shallow');
+var Snapdragon = require('snapdragon');
+var compilers = require('./compilers');
+var parsers = require('./parsers');
+var utils = require('./utils');
+
+/**
+ * Customize Snapdragon parser and renderer
+ */
+
+function Braces(options) {
+  this.options = extend({}, options);
+}
+
+/**
+ * Initialize braces
+ */
+
+Braces.prototype.init = function(options) {
+  if (this.isInitialized) return;
+  this.isInitialized = true;
+  var opts = utils.createOptions({}, this.options, options);
+  this.snapdragon = this.options.snapdragon || new Snapdragon(opts);
+  this.compiler = this.snapdragon.compiler;
+  this.parser = this.snapdragon.parser;
+
+  compilers(this.snapdragon, opts);
+  parsers(this.snapdragon, opts);
+
+  /**
+   * Call Snapdragon `.parse` method. When AST is returned, we check to
+   * see if any unclosed braces are left on the stack and, if so, we iterate
+   * over the stack and correct the AST so that compilers are called in the correct
+   * order and unbalance braces are properly escaped.
+   */
+
+  utils.define(this.snapdragon, 'parse', function(pattern, options) {
+    var parsed = Snapdragon.prototype.parse.apply(this, arguments);
+    this.parser.ast.input = pattern;
+
+    var stack = this.parser.stack;
+    while (stack.length) {
+      addParent({type: 'brace.close', val: ''}, stack.pop());
+    }
+
+    function addParent(node, parent) {
+      utils.define(node, 'parent', parent);
+      parent.nodes.push(node);
+    }
+
+    // add non-enumerable parser reference
+    utils.define(parsed, 'parser', this.parser);
+    return parsed;
+  });
+};
+
+/**
+ * Decorate `.parse` method
+ */
+
+Braces.prototype.parse = function(ast, options) {
+  if (ast && typeof ast === 'object' && ast.nodes) return ast;
+  this.init(options);
+  return this.snapdragon.parse(ast, options);
+};
+
+/**
+ * Decorate `.compile` method
+ */
+
+Braces.prototype.compile = function(ast, options) {
+  if (typeof ast === 'string') {
+    ast = this.parse(ast, options);
+  } else {
+    this.init(options);
+  }
+  return this.snapdragon.compile(ast, options);
+};
+
+/**
+ * Expand
+ */
+
+Braces.prototype.expand = function(pattern) {
+  var ast = this.parse(pattern, {expand: true});
+  return this.compile(ast, {expand: true});
+};
+
+/**
+ * Optimize
+ */
+
+Braces.prototype.optimize = function(pattern) {
+  var ast = this.parse(pattern, {optimize: true});
+  return this.compile(ast, {optimize: true});
+};
+
+/**
+ * Expose `Braces`
+ */
+
+module.exports = Braces;

node_modules/braces/lib/compilers.js

@@ -0,0 +1,282 @@
+'use strict';
+
+var utils = require('./utils');
+
+module.exports = function(braces, options) {
+  braces.compiler
+
+    /**
+     * bos
+     */
+
+    .set('bos', function() {
+      if (this.output) return;
+      this.ast.queue = isEscaped(this.ast) ? [this.ast.val] : [];
+      this.ast.count = 1;
+    })
+
+    /**
+     * Square brackets
+     */
+
+    .set('bracket', function(node) {
+      var close = node.close;
+      var open = !node.escaped ? '[' : '\\[';
+      var negated = node.negated;
+      var inner = node.inner;
+
+      inner = inner.replace(/\\(?=[\\\w]|$)/g, '\\\\');
+      if (inner === ']-') {
+        inner = '\\]\\-';
+      }
+
+      if (negated && inner.indexOf('.') === -1) {
+        inner += '.';
+      }
+      if (negated && inner.indexOf('/') === -1) {
+        inner += '/';
+      }
+
+      var val = open + negated + inner + close;
+      var queue = node.parent.queue;
+      var last = utils.arrayify(queue.pop());
+
+      queue.push(utils.join(last, val));
+      queue.push.apply(queue, []);
+    })
+
+    /**
+     * Brace
+     */
+
+    .set('brace', function(node) {
+      node.queue = isEscaped(node) ? [node.val] : [];
+      node.count = 1;
+      return this.mapVisit(node.nodes);
+    })
+
+    /**
+     * Open
+     */
+
+    .set('brace.open', function(node) {
+      node.parent.open = node.val;
+    })
+
+    /**
+     * Inner
+     */
+
+    .set('text', function(node) {
+      var queue = node.parent.queue;
+      var escaped = node.escaped;
+      var segs = [node.val];
+
+      if (node.optimize === false) {
+        options = utils.extend({}, options, {optimize: false});
+      }
+
+      if (node.multiplier > 1) {
+        node.parent.count *= node.multiplier;
+      }
+
+      if (options.quantifiers === true && utils.isQuantifier(node.val)) {
+        escaped = true;
+
+      } else if (node.val.length > 1) {
+        if (isType(node.parent, 'brace') && !isEscaped(node)) {
+          var expanded = utils.expand(node.val, options);
+          segs = expanded.segs;
+
+          if (expanded.isOptimized) {
+            node.parent.isOptimized = true;
+          }
+
+          // if nothing was expanded, we probably have a literal brace
+          if (!segs.length) {
+            var val = (expanded.val || node.val);
+            if (options.unescape !== false) {
+              // unescape unexpanded brace sequence/set separators
+              val = val.replace(/\\([,.])/g, '$1');
+              // strip quotes
+              val = val.replace(/["'`]/g, '');
+            }
+
+            segs = [val];
+            escaped = true;
+          }
+        }
+
+      } else if (node.val === ',') {
+        if (options.expand) {
+          node.parent.queue.push(['']);
+          segs = [''];
+        } else {
+          segs = ['|'];
+        }
+      } else {
+        escaped = true;
+      }
+
+      if (escaped && isType(node.parent, 'brace')) {
+        if (node.parent.nodes.length <= 4 && node.parent.count === 1) {
+          node.parent.escaped = true;
+        } else if (node.parent.length <= 3) {
+          node.parent.escaped = true;
+        }
+      }
+
+      if (!hasQueue(node.parent)) {
+        node.parent.queue = segs;
+        return;
+      }
+
+      var last = utils.arrayify(queue.pop());
+      if (node.parent.count > 1 && options.expand) {
+        last = multiply(last, node.parent.count);
+        node.parent.count = 1;
+      }
+
+      queue.push(utils.join(utils.flatten(last), segs.shift()));
+      queue.push.apply(queue, segs);
+    })
+
+    /**
+     * Close
+     */
+
+    .set('brace.close', function(node) {
+      var queue = node.parent.queue;
+      var prev = node.parent.parent;
+      var last = prev.queue.pop();
+      var open = node.parent.open;
+      var close = node.val;
+
+      if (open && close && isOptimized(node, options)) {
+        open = '(';
+        close = ')';
+      }
+
+      // if a close brace exists, and the previous segment is one character
+      // don't wrap the result in braces or parens
+      var ele = utils.last(queue);
+      if (node.parent.count > 1 && options.expand) {
+        ele = multiply(queue.pop(), node.parent.count);
+        node.parent.count = 1;
+        queue.push(ele);
+      }
+
+      if (close && typeof ele === 'string' && ele.length === 1) {
+        open = '';
+        close = '';
+      }
+
+      if ((isLiteralBrace(node, options) || noInner(node)) && !node.parent.hasEmpty) {
+        queue.push(utils.join(open, queue.pop() || ''));
+        queue = utils.flatten(utils.join(queue, close));
+      }
+
+      if (typeof last === 'undefined') {
+        prev.queue = [queue];
+      } else {
+        prev.queue.push(utils.flatten(utils.join(last, queue)));
+      }
+    })
+
+    /**
+     * eos
+     */
+
+    .set('eos', function(node) {
+      if (this.input) return;
+
+      if (options.optimize !== false) {
+        this.output = utils.last(utils.flatten(this.ast.queue));
+      } else if (Array.isArray(utils.last(this.ast.queue))) {
+        this.output = utils.flatten(this.ast.queue.pop());
+      } else {
+        this.output = utils.flatten(this.ast.queue);
+      }
+
+      if (node.parent.count > 1 && options.expand) {
+        this.output = multiply(this.output, node.parent.count);
+      }
+
+      this.output = utils.arrayify(this.output);
+      this.ast.queue = [];
+    });
+
+};
+
+/**
+ * Multiply the segments in the current brace level
+ */
+
+function multiply(queue, n, options) {
+  return utils.flatten(utils.repeat(utils.arrayify(queue), n));
+}
+
+/**
+ * Return true if `node` is escaped
+ */
+
+function isEscaped(node) {
+  return node.escaped === true;
+}
+
+/**
+ * Returns true if regex parens should be used for sets. If the parent `type`
+ * is not `brace`, then we're on a root node, which means we should never
+ * expand segments and open/close braces should be `{}` (since this indicates
+ * a brace is missing from the set)
+ */
+
+function isOptimized(node, options) {
+  if (node.parent.isOptimized) return true;
+  return isType(node.parent, 'brace')
+    && !isEscaped(node.parent)
+    && options.expand !== true;
+}
+
+/**
+ * Returns true if the value in `node` should be wrapped in a literal brace.
+ * @return {Boolean}
+ */
+
+function isLiteralBrace(node, options) {
+  return isEscaped(node.parent) || options.optimize !== false;
+}
+
+/**
+ * Returns true if the given `node` does not have an inner value.
+ * @return {Boolean}
+ */
+
+function noInner(node, type) {
+  if (node.parent.queue.length === 1) {
+    return true;
+  }
+  var nodes = node.parent.nodes;
+  return nodes.length === 3
+    && isType(nodes[0], 'brace.open')
+    && !isType(nodes[1], 'text')
+    && isType(nodes[2], 'brace.close');
+}
+
+/**
+ * Returns true if the given `node` is the given `type`
+ * @return {Boolean}
+ */
+
+function isType(node, type) {
+  return typeof node !== 'undefined' && node.type === type;
+}
+
+/**
+ * Returns true if the given `node` has a non-empty queue.
+ * @return {Boolean}
+ */
+
+function hasQueue(node) {
+  return Array.isArray(node.queue) && node.queue.length;
+}

node_modules/braces/lib/parsers.js

@@ -0,0 +1,360 @@
+'use strict';
+
+var Node = require('snapdragon-node');
+var utils = require('./utils');
+
+/**
+ * Braces parsers
+ */
+
+module.exports = function(braces, options) {
+  braces.parser
+    .set('bos', function() {
+      if (!this.parsed) {
+        this.ast = this.nodes[0] = new Node(this.ast);
+      }
+    })
+
+    /**
+     * Character parsers
+     */
+
+    .set('escape', function() {
+      var pos = this.position();
+      var m = this.match(/^(?:\\(.)|\$\{)/);
+      if (!m) return;
+
+      var prev = this.prev();
+      var last = utils.last(prev.nodes);
+
+      var node = pos(new Node({
+        type: 'text',
+        multiplier: 1,
+        val: m[0]
+      }));
+
+      if (node.val === '\\\\') {
+        return node;
+      }
+
+      if (node.val === '${') {
+        var str = this.input;
+        var idx = -1;
+        var ch;
+
+        while ((ch = str[++idx])) {
+          this.consume(1);
+          node.val += ch;
+          if (ch === '\\') {
+            node.val += str[++idx];
+            continue;
+          }
+          if (ch === '}') {
+            break;
+          }
+        }
+      }
+
+      if (this.options.unescape !== false) {
+        node.val = node.val.replace(/\\([{}])/g, '$1');
+      }
+
+      if (last.val === '"' && this.input.charAt(0) === '"') {
+        last.val = node.val;
+        this.consume(1);
+        return;
+      }
+
+      return concatNodes.call(this, pos, node, prev, options);
+    })
+
+    /**
+     * Brackets: "[...]" (basic, this is overridden by
+     * other parsers in more advanced implementations)
+     */
+
+    .set('bracket', function() {
+      var isInside = this.isInside('brace');
+      var pos = this.position();
+      var m = this.match(/^(?:\[([!^]?)([^\]]{2,}|\]-)(\]|[^*+?]+)|\[)/);
+      if (!m) return;
+
+      var prev = this.prev();
+      var val = m[0];
+      var negated = m[1] ? '^' : '';
+      var inner = m[2] || '';
+      var close = m[3] || '';
+
+      if (isInside && prev.type === 'brace') {
+        prev.text = prev.text || '';
+        prev.text += val;
+      }
+
+      var esc = this.input.slice(0, 2);
+      if (inner === '' && esc === '\\]') {
+        inner += esc;
+        this.consume(2);
+
+        var str = this.input;
+        var idx = -1;
+        var ch;
+
+        while ((ch = str[++idx])) {
+          this.consume(1);
+          if (ch === ']') {
+            close = ch;
+            break;
+          }
+          inner += ch;
+        }
+      }
+
+      return pos(new Node({
+        type: 'bracket',
+        val: val,
+        escaped: close !== ']',
+        negated: negated,
+        inner: inner,
+        close: close
+      }));
+    })
+
+    /**
+     * Empty braces (we capture these early to
+     * speed up processing in the compiler)
+     */
+
+    .set('multiplier', function() {
+      var isInside = this.isInside('brace');
+      var pos = this.position();
+      var m = this.match(/^\{((?:,|\{,+\})+)\}/);
+      if (!m) return;
+
+      this.multiplier = true;
+      var prev = this.prev();
+      var val = m[0];
+
+      if (isInside && prev.type === 'brace') {
+        prev.text = prev.text || '';
+        prev.text += val;
+      }
+
+      var node = pos(new Node({
+        type: 'text',
+        multiplier: 1,
+        match: m,
+        val: val
+      }));
+
+      return concatNodes.call(this, pos, node, prev, options);
+    })
+
+    /**
+     * Open
+     */
+
+    .set('brace.open', function() {
+      var pos = this.position();
+      var m = this.match(/^\{(?!(?:[^\\}]?|,+)\})/);
+      if (!m) return;
+
+      var prev = this.prev();
+      var last = utils.last(prev.nodes);
+
+      // if the last parsed character was an extglob character
+      // we need to _not optimize_ the brace pattern because
+      // it might be mistaken for an extglob by a downstream parser
+      if (last && last.val && isExtglobChar(last.val.slice(-1))) {
+        last.optimize = false;
+      }
+
+      var open = pos(new Node({
+        type: 'brace.open',
+        val: m[0]
+      }));
+
+      var node = pos(new Node({
+        type: 'brace',
+        nodes: []
+      }));
+
+      node.push(open);
+      prev.push(node);
+      this.push('brace', node);
+    })
+
+    /**
+     * Close
+     */
+
+    .set('brace.close', function() {
+      var pos = this.position();
+      var m = this.match(/^\}/);
+      if (!m || !m[0]) return;
+
+      var brace = this.pop('brace');
+      var node = pos(new Node({
+        type: 'brace.close',
+        val: m[0]
+      }));
+
+      if (!this.isType(brace, 'brace')) {
+        if (this.options.strict) {
+          throw new Error('missing opening "{"');
+        }
+        node.type = 'text';
+        node.multiplier = 0;
+        node.escaped = true;
+        return node;
+      }
+
+      var prev = this.prev();
+      var last = utils.last(prev.nodes);
+      if (last.text) {
+        var lastNode = utils.last(last.nodes);
+        if (lastNode.val === ')' && /[!@*?+]\(/.test(last.text)) {
+          var open = last.nodes[0];
+          var text = last.nodes[1];
+          if (open.type === 'brace.open' && text && text.type === 'text') {
+            text.optimize = false;
+          }
+        }
+      }
+
+      if (brace.nodes.length > 2) {
+        var first = brace.nodes[1];
+        if (first.type === 'text' && first.val === ',') {
+          brace.nodes.splice(1, 1);
+          brace.nodes.push(first);
+        }
+      }
+
+      brace.push(node);
+    })
+
+    /**
+     * Capture boundary characters
+     */
+
+    .set('boundary', function() {
+      var pos = this.position();
+      var m = this.match(/^[$^](?!\{)/);
+      if (!m) return;
+      return pos(new Node({
+        type: 'text',
+        val: m[0]
+      }));
+    })
+
+    /**
+     * One or zero, non-comma characters wrapped in braces
+     */
+
+    .set('nobrace', function() {
+      var isInside = this.isInside('brace');
+      var pos = this.position();
+      var m = this.match(/^\{[^,]?\}/);
+      if (!m) return;
+
+      var prev = this.prev();
+      var val = m[0];
+
+      if (isInside && prev.type === 'brace') {
+        prev.text = prev.text || '';
+        prev.text += val;
+      }
+
+      return pos(new Node({
+        type: 'text',
+        multiplier: 0,
+        val: val
+      }));
+    })
+
+    /**
+     * Text
+     */
+
+    .set('text', function() {
+      var isInside = this.isInside('brace');
+      var pos = this.position();
+      var m = this.match(/^((?!\\)[^${}[\]])+/);
+      if (!m) return;
+
+      var prev = this.prev();
+      var val = m[0];
+
+      if (isInside && prev.type === 'brace') {
+        prev.text = prev.text || '';
+        prev.text += val;
+      }
+
+      var node = pos(new Node({
+        type: 'text',
+        multiplier: 1,
+        val: val
+      }));
+
+      return concatNodes.call(this, pos, node, prev, options);
+    });
+};
+
+/**
+ * Returns true if the character is an extglob character.
+ */
+
+function isExtglobChar(ch) {
+  return ch === '!' || ch === '@' || ch === '*' || ch === '?' || ch === '+';
+}
+
+/**
+ * Combine text nodes, and calculate empty sets (`{,,}`)
+ * @param {Function} `pos` Function to calculate node position
+ * @param {Object} `node` AST node
+ * @return {Object}
+ */
+
+function concatNodes(pos, node, parent, options) {
+  node.orig = node.val;
+  var prev = this.prev();
+  var last = utils.last(prev.nodes);
+  var isEscaped = false;
+
+  if (node.val.length > 1) {
+    var a = node.val.charAt(0);
+    var b = node.val.slice(-1);
+
+    isEscaped = (a === '"' && b === '"')
+      || (a === "'" && b === "'")
+      || (a === '`' && b === '`');
+  }
+
+  if (isEscaped && options.unescape !== false) {
+    node.val = node.val.slice(1, node.val.length - 1);
+    node.escaped = true;
+  }
+
+  if (node.match) {
+    var match = node.match[1];
+    if (!match || match.indexOf('}') === -1) {
+      match = node.match[0];
+    }
+
+    // replace each set with a single ","
+    var val = match.replace(/\{/g, ',').replace(/\}/g, '');
+    node.multiplier *= val.length;
+    node.val = '';
+  }
+
+  var simpleText = last.type === 'text'
+    && last.multiplier === 1
+    && node.multiplier === 1
+    && node.val;
+
+  if (simpleText) {
+    last.val += node.val;
+    return;
+  }
+
+  prev.push(node);
+}

node_modules/braces/lib/utils.js

@@ -0,0 +1,343 @@
+'use strict';
+
+var splitString = require('split-string');
+var utils = module.exports;
+
+/**
+ * Module dependencies
+ */
+
+utils.extend = require('extend-shallow');
+utils.flatten = require('arr-flatten');
+utils.isObject = require('isobject');
+utils.fillRange = require('fill-range');
+utils.repeat = require('repeat-element');
+utils.unique = require('array-unique');
+
+utils.define = function(obj, key, val) {
+  Object.defineProperty(obj, key, {
+    writable: true,
+    configurable: true,
+    enumerable: false,
+    value: val
+  });
+};
+
+/**
+ * Returns true if the given string contains only empty brace sets.
+ */
+
+utils.isEmptySets = function(str) {
+  return /^(?:\{,\})+$/.test(str);
+};
+
+/**
+ * Returns true if the given string contains only empty brace sets.
+ */
+
+utils.isQuotedString = function(str) {
+  var open = str.charAt(0);
+  if (open === '\'' || open === '"' || open === '`') {
+    return str.slice(-1) === open;
+  }
+  return false;
+};
+
+/**
+ * Create the key to use for memoization. The unique key is generated
+ * by iterating over the options and concatenating key-value pairs
+ * to the pattern string.
+ */
+
+utils.createKey = function(pattern, options) {
+  var id = pattern;
+  if (typeof options === 'undefined') {
+    return id;
+  }
+  var keys = Object.keys(options);
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i];
+    id += ';' + key + '=' + String(options[key]);
+  }
+  return id;
+};
+
+/**
+ * Normalize options
+ */
+
+utils.createOptions = function(options) {
+  var opts = utils.extend.apply(null, arguments);
+  if (typeof opts.expand === 'boolean') {
+    opts.optimize = !opts.expand;
+  }
+  if (typeof opts.optimize === 'boolean') {
+    opts.expand = !opts.optimize;
+  }
+  if (opts.optimize === true) {
+    opts.makeRe = true;
+  }
+  return opts;
+};
+
+/**
+ * Join patterns in `a` to patterns in `b`
+ */
+
+utils.join = function(a, b, options) {
+  options = options || {};
+  a = utils.arrayify(a);
+  b = utils.arrayify(b);
+
+  if (!a.length) return b;
+  if (!b.length) return a;
+
+  var len = a.length;
+  var idx = -1;
+  var arr = [];
+
+  while (++idx < len) {
+    var val = a[idx];
+    if (Array.isArray(val)) {
+      for (var i = 0; i < val.length; i++) {
+        val[i] = utils.join(val[i], b, options);
+      }
+      arr.push(val);
+      continue;
+    }
+
+    for (var j = 0; j < b.length; j++) {
+      var bval = b[j];
+
+      if (Array.isArray(bval)) {
+        arr.push(utils.join(val, bval, options));
+      } else {
+        arr.push(val + bval);
+      }
+    }
+  }
+  return arr;
+};
+
+/**
+ * Split the given string on `,` if not escaped.
+ */
+
+utils.split = function(str, options) {
+  var opts = utils.extend({sep: ','}, options);
+  if (typeof opts.keepQuotes !== 'boolean') {
+    opts.keepQuotes = true;
+  }
+  if (opts.unescape === false) {
+    opts.keepEscaping = true;
+  }
+  return splitString(str, opts, utils.escapeBrackets(opts));
+};
+
+/**
+ * Expand ranges or sets in the given `pattern`.
+ *
+ * @param {String} `str`
+ * @param {Object} `options`
+ * @return {Object}
+ */
+
+utils.expand = function(str, options) {
+  var opts = utils.extend({rangeLimit: 10000}, options);
+  var segs = utils.split(str, opts);
+  var tok = { segs: segs };
+
+  if (utils.isQuotedString(str)) {
+    return tok;
+  }
+
+  if (opts.rangeLimit === true) {
+    opts.rangeLimit = 10000;
+  }
+
+  if (segs.length > 1) {
+    if (opts.optimize === false) {
+      tok.val = segs[0];
+      return tok;
+    }
+
+    tok.segs = utils.stringifyArray(tok.segs);
+  } else if (segs.length === 1) {
+    var arr = str.split('..');
+
+    if (arr.length === 1) {
+      tok.val = tok.segs[tok.segs.length - 1] || tok.val || str;
+      tok.segs = [];
+      return tok;
+    }
+
+    if (arr.length === 2 && arr[0] === arr[1]) {
+      tok.escaped = true;
+      tok.val = arr[0];
+      tok.segs = [];
+      return tok;
+    }
+
+    if (arr.length > 1) {
+      if (opts.optimize !== false) {
+        opts.optimize = true;
+        delete opts.expand;
+      }
+
+      if (opts.optimize !== true) {
+        var min = Math.min(arr[0], arr[1]);
+        var max = Math.max(arr[0], arr[1]);
+        var step = arr[2] || 1;
+
+        if (opts.rangeLimit !== false && ((max - min) / step >= opts.rangeLimit)) {
+          throw new RangeError('expanded array length exceeds range limit. Use options.rangeLimit to increase or disable the limit.');
+        }
+      }
+
+      arr.push(opts);
+      tok.segs = utils.fillRange.apply(null, arr);
+
+      if (!tok.segs.length) {
+        tok.escaped = true;
+        tok.val = str;
+        return tok;
+      }
+
+      if (opts.optimize === true) {
+        tok.segs = utils.stringifyArray(tok.segs);
+      }
+
+      if (tok.segs === '') {
+        tok.val = str;
+      } else {
+        tok.val = tok.segs[0];
+      }
+      return tok;
+    }
+  } else {
+    tok.val = str;
+  }
+  return tok;
+};
+
+/**
+ * Ensure commas inside brackets and parens are not split.
+ * @param {Object} `tok` Token from the `split-string` module
+ * @return {undefined}
+ */
+
+utils.escapeBrackets = function(options) {
+  return function(tok) {
+    if (tok.escaped && tok.val === 'b') {
+      tok.val = '\\b';
+      return;
+    }
+
+    if (tok.val !== '(' && tok.val !== '[') return;
+    var opts = utils.extend({}, options);
+    var brackets = [];
+    var parens = [];
+    var stack = [];
+    var val = tok.val;
+    var str = tok.str;
+    var i = tok.idx - 1;
+
+    while (++i < str.length) {
+      var ch = str[i];
+
+      if (ch === '\\') {
+        val += (opts.keepEscaping === false ? '' : ch) + str[++i];
+        continue;
+      }
+
+      if (ch === '(') {
+        parens.push(ch);
+        stack.push(ch);
+      }
+
+      if (ch === '[') {
+        brackets.push(ch);
+        stack.push(ch);
+      }
+
+      if (ch === ')') {
+        parens.pop();
+        stack.pop();
+        if (!stack.length) {
+          val += ch;
+          break;
+        }
+      }
+
+      if (ch === ']') {
+        brackets.pop();
+        stack.pop();
+        if (!stack.length) {
+          val += ch;
+          break;
+        }
+      }
+      val += ch;
+    }
+
+    tok.split = false;
+    tok.val = val.slice(1);
+    tok.idx = i;
+  };
+};
+
+/**
+ * Returns true if the given string looks like a regex quantifier
+ * @return {Boolean}
+ */
+
+utils.isQuantifier = function(str) {
+  return /^(?:[0-9]?,[0-9]|[0-9],)$/.test(str);
+};
+
+/**
+ * Cast `val` to an array.
+ * @param {*} `val`
+ */
+
+utils.stringifyArray = function(arr) {
+  return [utils.arrayify(arr).join('|')];
+};
+
+/**
+ * Cast `val` to an array.
+ * @param {*} `val`
+ */
+
+utils.arrayify = function(arr) {
+  if (typeof arr === 'undefined') {
+    return [];
+  }
+  if (typeof arr === 'string') {
+    return [arr];
+  }
+  return arr;
+};
+
+/**
+ * Returns true if the given `str` is a non-empty string
+ * @return {Boolean}
+ */
+
+utils.isString = function(str) {
+  return str != null && typeof str === 'string';
+};
+
+/**
+ * Get the last element from `array`
+ * @param {Array} `array`
+ * @return {*}
+ */
+
+utils.last = function(arr, n) {
+  return arr[arr.length - (n || 1)];
+};
+
+utils.escapeRegex = function(str) {
+  return str.replace(/\\?([!^*?()[\]{}+?/])/g, '\\$1');
+};