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{"version":3,"file":"esquery.min.js","sources":["../node_modules/estraverse/estraverse.js","../parser.js","../esquery.js"],"sourcesContent":["/*\n  Copyright (C) 2012-2013 Yusuke Suzuki <utatane.tea@gmail.com>\n  Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>\n\n  Redistribution and use in source and binary forms, with or without\n  modification, are permitted provided that the following conditions are met:\n\n    * Redistributions of source code must retain the above copyright\n      notice, this list of conditions and the following disclaimer.\n    * Redistributions in binary form must reproduce the above copyright\n      notice, this list of conditions and the following disclaimer in the\n      documentation and/or other materials provided with the distribution.\n\n  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY\n  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\n  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n*/\n/*jslint vars:false, bitwise:true*/\n/*jshint indent:4*/\n/*global exports:true*/\n(function clone(exports) {\n    'use strict';\n\n    var Syntax,\n        VisitorOption,\n        VisitorKeys,\n        BREAK,\n        SKIP,\n        REMOVE;\n\n    function deepCopy(obj) {\n        var ret = {}, key, val;\n        for (key in obj) {\n            if (obj.hasOwnProperty(key)) {\n                val = obj[key];\n                if (typeof val === 'object' && val !== null) {\n                    ret[key] = deepCopy(val);\n                } else {\n                    ret[key] = val;\n                }\n            }\n        }\n        return ret;\n    }\n\n    // based on LLVM libc++ upper_bound / lower_bound\n    // MIT License\n\n    function upperBound(array, func) {\n        var diff, len, i, current;\n\n        len = array.length;\n        i = 0;\n\n        while (len) {\n            diff = len >>> 1;\n            current = i + diff;\n            if (func(array[current])) {\n                len = diff;\n            } else {\n                i = current + 1;\n                len -= diff + 1;\n            }\n        }\n        return i;\n    }\n\n    Syntax = {\n        AssignmentExpression: 'AssignmentExpression',\n        AssignmentPattern: 'AssignmentPattern',\n        ArrayExpression: 'ArrayExpression',\n        ArrayPattern: 'ArrayPattern',\n        ArrowFunctionExpression: 'ArrowFunctionExpression',\n        AwaitExpression: 'AwaitExpression', // CAUTION: It's deferred to ES7.\n        BlockStatement: 'BlockStatement',\n        BinaryExpression: 'BinaryExpression',\n        BreakStatement: 'BreakStatement',\n        CallExpression: 'CallExpression',\n        CatchClause: 'CatchClause',\n        ChainExpression: 'ChainExpression',\n        ClassBody: 'ClassBody',\n        ClassDeclaration: 'ClassDeclaration',\n        ClassExpression: 'ClassExpression',\n        ComprehensionBlock: 'ComprehensionBlock',  // CAUTION: It's deferred to ES7.\n        ComprehensionExpression: 'ComprehensionExpression',  // CAUTION: It's deferred to ES7.\n        ConditionalExpression: 'ConditionalExpression',\n        ContinueStatement: 'ContinueStatement',\n        DebuggerStatement: 'DebuggerStatement',\n        DirectiveStatement: 'DirectiveStatement',\n        DoWhileStatement: 'DoWhileStatement',\n        EmptyStatement: 'EmptyStatement',\n        ExportAllDeclaration: 'ExportAllDeclaration',\n        ExportDefaultDeclaration: 'ExportDefaultDeclaration',\n        ExportNamedDeclaration: 'ExportNamedDeclaration',\n        ExportSpecifier: 'ExportSpecifier',\n        ExpressionStatement: 'ExpressionStatement',\n        ForStatement: 'ForStatement',\n        ForInStatement: 'ForInStatement',\n        ForOfStatement: 'ForOfStatement',\n        FunctionDeclaration: 'FunctionDeclaration',\n        FunctionExpression: 'FunctionExpression',\n        GeneratorExpression: 'GeneratorExpression',  // CAUTION: It's deferred to ES7.\n        Identifier: 'Identifier',\n        IfStatement: 'IfStatement',\n        ImportExpression: 'ImportExpression',\n        ImportDeclaration: 'ImportDeclaration',\n        ImportDefaultSpecifier: 'ImportDefaultSpecifier',\n        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',\n        ImportSpecifier: 'ImportSpecifier',\n        Literal: 'Literal',\n        LabeledStatement: 'LabeledStatement',\n        LogicalExpression: 'LogicalExpression',\n        MemberExpression: 'MemberExpression',\n        MetaProperty: 'MetaProperty',\n        MethodDefinition: 'MethodDefinition',\n        ModuleSpecifier: 'ModuleSpecifier',\n        NewExpression: 'NewExpression',\n        ObjectExpression: 'ObjectExpression',\n        ObjectPattern: 'ObjectPattern',\n        PrivateIdentifier: 'PrivateIdentifier',\n        Program: 'Program',\n        Property: 'Property',\n        PropertyDefinition: 'PropertyDefinition',\n        RestElement: 'RestElement',\n        ReturnStatement: 'ReturnStatement',\n        SequenceExpression: 'SequenceExpression',\n        SpreadElement: 'SpreadElement',\n        Super: 'Super',\n        SwitchStatement: 'SwitchStatement',\n        SwitchCase: 'SwitchCase',\n        TaggedTemplateExpression: 'TaggedTemplateExpression',\n        TemplateElement: 'TemplateElement',\n        TemplateLiteral: 'TemplateLiteral',\n        ThisExpression: 'ThisExpression',\n        ThrowStatement: 'ThrowStatement',\n        TryStatement: 'TryStatement',\n        UnaryExpression: 'UnaryExpression',\n        UpdateExpression: 'UpdateExpression',\n        VariableDeclaration: 'VariableDeclaration',\n        VariableDeclarator: 'VariableDeclarator',\n        WhileStatement: 'WhileStatement',\n        WithStatement: 'WithStatement',\n        YieldExpression: 'YieldExpression'\n    };\n\n    VisitorKeys = {\n        AssignmentExpression: ['left', 'right'],\n        AssignmentPattern: ['left', 'right'],\n        ArrayExpression: ['elements'],\n        ArrayPattern: ['elements'],\n        ArrowFunctionExpression: ['params', 'body'],\n        AwaitExpression: ['argument'], // CAUTION: It's deferred to ES7.\n        BlockStatement: ['body'],\n        BinaryExpression: ['left', 'right'],\n        BreakStatement: ['label'],\n        CallExpression: ['callee', 'arguments'],\n        CatchClause: ['param', 'body'],\n        ChainExpression: ['expression'],\n        ClassBody: ['body'],\n        ClassDeclaration: ['id', 'superClass', 'body'],\n        ClassExpression: ['id', 'superClass', 'body'],\n        ComprehensionBlock: ['left', 'right'],  // CAUTION: It's deferred to ES7.\n        ComprehensionExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.\n        ConditionalExpression: ['test', 'consequent', 'alternate'],\n        ContinueStatement: ['label'],\n        DebuggerStatement: [],\n        DirectiveStatement: [],\n        DoWhileStatement: ['body', 'test'],\n        EmptyStatement: [],\n        ExportAllDeclaration: ['source'],\n        ExportDefaultDeclaration: ['declaration'],\n        ExportNamedDeclaration: ['declaration', 'specifiers', 'source'],\n        ExportSpecifier: ['exported', 'local'],\n        ExpressionStatement: ['expression'],\n        ForStatement: ['init', 'test', 'update', 'body'],\n        ForInStatement: ['left', 'right', 'body'],\n        ForOfStatement: ['left', 'right', 'body'],\n        FunctionDeclaration: ['id', 'params', 'body'],\n        FunctionExpression: ['id', 'params', 'body'],\n        GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.\n        Identifier: [],\n        IfStatement: ['test', 'consequent', 'alternate'],\n        ImportExpression: ['source'],\n        ImportDeclaration: ['specifiers', 'source'],\n        ImportDefaultSpecifier: ['local'],\n        ImportNamespaceSpecifier: ['local'],\n        ImportSpecifier: ['imported', 'local'],\n        Literal: [],\n        LabeledStatement: ['label', 'body'],\n        LogicalExpression: ['left', 'right'],\n        MemberExpression: ['object', 'property'],\n        MetaProperty: ['meta', 'property'],\n        MethodDefinition: ['key', 'value'],\n        ModuleSpecifier: [],\n        NewExpression: ['callee', 'arguments'],\n        ObjectExpression: ['properties'],\n        ObjectPattern: ['properties'],\n        PrivateIdentifier: [],\n        Program: ['body'],\n        Property: ['key', 'value'],\n        PropertyDefinition: ['key', 'value'],\n        RestElement: [ 'argument' ],\n        ReturnStatement: ['argument'],\n        SequenceExpression: ['expressions'],\n        SpreadElement: ['argument'],\n        Super: [],\n        SwitchStatement: ['discriminant', 'cases'],\n        SwitchCase: ['test', 'consequent'],\n        TaggedTemplateExpression: ['tag', 'quasi'],\n        TemplateElement: [],\n        TemplateLiteral: ['quasis', 'expressions'],\n        ThisExpression: [],\n        ThrowStatement: ['argument'],\n        TryStatement: ['block', 'handler', 'finalizer'],\n        UnaryExpression: ['argument'],\n        UpdateExpression: ['argument'],\n        VariableDeclaration: ['declarations'],\n        VariableDeclarator: ['id', 'init'],\n        WhileStatement: ['test', 'body'],\n        WithStatement: ['object', 'body'],\n        YieldExpression: ['argument']\n    };\n\n    // unique id\n    BREAK = {};\n    SKIP = {};\n    REMOVE = {};\n\n    VisitorOption = {\n        Break: BREAK,\n        Skip: SKIP,\n        Remove: REMOVE\n    };\n\n    function Reference(parent, key) {\n        this.parent = parent;\n        this.key = key;\n    }\n\n    Reference.prototype.replace = function replace(node) {\n        this.parent[this.key] = node;\n    };\n\n    Reference.prototype.remove = function remove() {\n        if (Array.isArray(this.parent)) {\n            this.parent.splice(this.key, 1);\n            return true;\n        } else {\n            this.replace(null);\n            return false;\n        }\n    };\n\n    function Element(node, path, wrap, ref) {\n        this.node = node;\n        this.path = path;\n        this.wrap = wrap;\n        this.ref = ref;\n    }\n\n    function Controller() { }\n\n    // API:\n    // return property path array from root to current node\n    Controller.prototype.path = function path() {\n        var i, iz, j, jz, result, element;\n\n        function addToPath(result, path) {\n            if (Array.isArray(path)) {\n                for (j = 0, jz = path.length; j < jz; ++j) {\n                    result.push(path[j]);\n                }\n            } else {\n                result.push(path);\n            }\n        }\n\n        // root node\n        if (!this.__current.path) {\n            return null;\n        }\n\n        // first node is sentinel, second node is root element\n        result = [];\n        for (i = 2, iz = this.__leavelist.length; i < iz; ++i) {\n            element = this.__leavelist[i];\n            addToPath(result, element.path);\n        }\n        addToPath(result, this.__current.path);\n        return result;\n    };\n\n    // API:\n    // return type of current node\n    Controller.prototype.type = function () {\n        var node = this.current();\n        return node.type || this.__current.wrap;\n    };\n\n    // API:\n    // return array of parent elements\n    Controller.prototype.parents = function parents() {\n        var i, iz, result;\n\n        // first node is sentinel\n        result = [];\n        for (i = 1, iz = this.__leavelist.length; i < iz; ++i) {\n            result.push(this.__leavelist[i].node);\n        }\n\n        return result;\n    };\n\n    // API:\n    // return current node\n    Controller.prototype.current = function current() {\n        return this.__current.node;\n    };\n\n    Controller.prototype.__execute = function __execute(callback, element) {\n        var previous, result;\n\n        result = undefined;\n\n        previous  = this.__current;\n        this.__current = element;\n        this.__state = null;\n        if (callback) {\n            result = callback.call(this, element.node, this.__leavelist[this.__leavelist.length - 1].node);\n        }\n        this.__current = previous;\n\n        return result;\n    };\n\n    // API:\n    // notify control skip / break\n    Controller.prototype.notify = function notify(flag) {\n        this.__state = flag;\n    };\n\n    // API:\n    // skip child nodes of current node\n    Controller.prototype.skip = function () {\n        this.notify(SKIP);\n    };\n\n    // API:\n    // break traversals\n    Controller.prototype['break'] = function () {\n        this.notify(BREAK);\n    };\n\n    // API:\n    // remove node\n    Controller.prototype.remove = function () {\n        this.notify(REMOVE);\n    };\n\n    Controller.prototype.__initialize = function(root, visitor) {\n        this.visitor = visitor;\n        this.root = root;\n        this.__worklist = [];\n        this.__leavelist = [];\n        this.__current = null;\n        this.__state = null;\n        this.__fallback = null;\n        if (visitor.fallback === 'iteration') {\n            this.__fallback = Object.keys;\n        } else if (typeof visitor.fallback === 'function') {\n            this.__fallback = visitor.fallback;\n        }\n\n        this.__keys = VisitorKeys;\n        if (visitor.keys) {\n            this.__keys = Object.assign(Object.create(this.__keys), visitor.keys);\n        }\n    };\n\n    function isNode(node) {\n        if (node == null) {\n            return false;\n        }\n        return typeof node === 'object' && typeof node.type === 'string';\n    }\n\n    function isProperty(nodeType, key) {\n        return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;\n    }\n  \n    function candidateExistsInLeaveList(leavelist, candidate) {\n        for (var i = leavelist.length - 1; i >= 0; --i) {\n            if (leavelist[i].node === candidate) {\n                return true;\n            }\n        }\n        return false;\n    }\n\n    Controller.prototype.traverse = function traverse(root, visitor) {\n        var worklist,\n            leavelist,\n            element,\n            node,\n            nodeType,\n            ret,\n            key,\n            current,\n            current2,\n            candidates,\n            candidate,\n            sentinel;\n\n        this.__initialize(root, visitor);\n\n        sentinel = {};\n\n        // reference\n        worklist = this.__worklist;\n        leavelist = this.__leavelist;\n\n        // initialize\n        worklist.push(new Element(root, null, null, null));\n        leavelist.push(new Element(null, null, null, null));\n\n        while (worklist.length) {\n            element = worklist.pop();\n\n            if (element === sentinel) {\n                element = leavelist.pop();\n\n                ret = this.__execute(visitor.leave, element);\n\n                if (this.__state === BREAK || ret === BREAK) {\n                    return;\n                }\n                continue;\n            }\n\n            if (element.node) {\n\n                ret = this.__execute(visitor.enter, element);\n\n                if (this.__state === BREAK || ret === BREAK) {\n                    return;\n                }\n\n                worklist.push(sentinel);\n                leavelist.push(element);\n\n                if (this.__state === SKIP || ret === SKIP) {\n                    continue;\n                }\n\n                node = element.node;\n                nodeType = node.type || element.wrap;\n                candidates = this.__keys[nodeType];\n                if (!candidates) {\n                    if (this.__fallback) {\n                        candidates = this.__fallback(node);\n                    } else {\n                        throw new Error('Unknown node type ' + nodeType + '.');\n                    }\n                }\n\n                current = candidates.length;\n                while ((current -= 1) >= 0) {\n                    key = candidates[current];\n                    candidate = node[key];\n                    if (!candidate) {\n                        continue;\n                    }\n\n                    if (Array.isArray(candidate)) {\n                        current2 = candidate.length;\n                        while ((current2 -= 1) >= 0) {\n                            if (!candidate[current2]) {\n                                continue;\n                            }\n\n                            if (candidateExistsInLeaveList(leavelist, candidate[current2])) {\n                              continue;\n                            }\n\n                            if (isProperty(nodeType, candidates[current])) {\n                                element = new Element(candidate[current2], [key, current2], 'Property', null);\n                            } else if (isNode(candidate[current2])) {\n                                element = new Element(candidate[current2], [key, current2], null, null);\n                            } else {\n                                continue;\n                            }\n                            worklist.push(element);\n                        }\n                    } else if (isNode(candidate)) {\n                        if (candidateExistsInLeaveList(leavelist, candidate)) {\n                          continue;\n                        }\n\n                        worklist.push(new Element(candidate, key, null, null));\n                    }\n                }\n            }\n        }\n    };\n\n    Controller.prototype.replace = function replace(root, visitor) {\n        var worklist,\n            leavelist,\n            node,\n            nodeType,\n            target,\n            element,\n            current,\n            current2,\n            candidates,\n            candidate,\n            sentinel,\n            outer,\n            key;\n\n        function removeElem(element) {\n            var i,\n                key,\n                nextElem,\n                parent;\n\n            if (element.ref.remove()) {\n                // When the reference is an element of an array.\n                key = element.ref.key;\n                parent = element.ref.parent;\n\n                // If removed from array, then decrease following items' keys.\n                i = worklist.length;\n                while (i--) {\n                    nextElem = worklist[i];\n                    if (nextElem.ref && nextElem.ref.parent === parent) {\n                        if  (nextElem.ref.key < key) {\n                            break;\n                        }\n                        --nextElem.ref.key;\n                    }\n                }\n            }\n        }\n\n        this.__initialize(root, visitor);\n\n        sentinel = {};\n\n        // reference\n        worklist = this.__worklist;\n        leavelist = this.__leavelist;\n\n        // initialize\n        outer = {\n            root: root\n        };\n        element = new Element(root, null, null, new Reference(outer, 'root'));\n        worklist.push(element);\n        leavelist.push(element);\n\n        while (worklist.length) {\n            element = worklist.pop();\n\n            if (element === sentinel) {\n                element = leavelist.pop();\n\n                target = this.__execute(visitor.leave, element);\n\n                // node may be replaced with null,\n                // so distinguish between undefined and null in this place\n                if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {\n                    // replace\n                    element.ref.replace(target);\n                }\n\n                if (this.__state === REMOVE || target === REMOVE) {\n                    removeElem(element);\n                }\n\n                if (this.__state === BREAK || target === BREAK) {\n                    return outer.root;\n                }\n                continue;\n            }\n\n            target = this.__execute(visitor.enter, element);\n\n            // node may be replaced with null,\n            // so distinguish between undefined and null in this place\n            if (target !== undefined && target !== BREAK && target !== SKIP && target !== REMOVE) {\n                // replace\n                element.ref.replace(target);\n                element.node = target;\n            }\n\n            if (this.__state === REMOVE || target === REMOVE) {\n                removeElem(element);\n                element.node = null;\n            }\n\n            if (this.__state === BREAK || target === BREAK) {\n                return outer.root;\n            }\n\n            // node may be null\n            node = element.node;\n            if (!node) {\n                continue;\n            }\n\n            worklist.push(sentinel);\n            leavelist.push(element);\n\n            if (this.__state === SKIP || target === SKIP) {\n                continue;\n            }\n\n            nodeType = node.type || element.wrap;\n            candidates = this.__keys[nodeType];\n            if (!candidates) {\n                if (this.__fallback) {\n                    candidates = this.__fallback(node);\n                } else {\n                    throw new Error('Unknown node type ' + nodeType + '.');\n                }\n            }\n\n            current = candidates.length;\n            while ((current -= 1) >= 0) {\n                key = candidates[current];\n                candidate = node[key];\n                if (!candidate) {\n                    continue;\n                }\n\n                if (Array.isArray(candidate)) {\n                    current2 = candidate.length;\n                    while ((current2 -= 1) >= 0) {\n                        if (!candidate[current2]) {\n                            continue;\n                        }\n                        if (isProperty(nodeType, candidates[current])) {\n                            element = new Element(candidate[current2], [key, current2], 'Property', new Reference(candidate, current2));\n                        } else if (isNode(candidate[current2])) {\n                            element = new Element(candidate[current2], [key, current2], null, new Reference(candidate, current2));\n                        } else {\n                            continue;\n                        }\n                        worklist.push(element);\n                    }\n                } else if (isNode(candidate)) {\n                    worklist.push(new Element(candidate, key, null, new Reference(node, key)));\n                }\n            }\n        }\n\n        return outer.root;\n    };\n\n    function traverse(root, visitor) {\n        var controller = new Controller();\n        return controller.traverse(root, visitor);\n    }\n\n    function replace(root, visitor) {\n        var controller = new Controller();\n        return controller.replace(root, visitor);\n    }\n\n    function extendCommentRange(comment, tokens) {\n        var target;\n\n        target = upperBound(tokens, function search(token) {\n            return token.range[0] > comment.range[0];\n        });\n\n        comment.extendedRange = [comment.range[0], comment.range[1]];\n\n        if (target !== tokens.length) {\n            comment.extendedRange[1] = tokens[target].range[0];\n        }\n\n        target -= 1;\n        if (target >= 0) {\n            comment.extendedRange[0] = tokens[target].range[1];\n        }\n\n        return comment;\n    }\n\n    function attachComments(tree, providedComments, tokens) {\n        // At first, we should calculate extended comment ranges.\n        var comments = [], comment, len, i, cursor;\n\n        if (!tree.range) {\n            throw new Error('attachComments needs range information');\n        }\n\n        // tokens array is empty, we attach comments to tree as 'leadingComments'\n        if (!tokens.length) {\n            if (providedComments.length) {\n                for (i = 0, len = providedComments.length; i < len; i += 1) {\n                    comment = deepCopy(providedComments[i]);\n                    comment.extendedRange = [0, tree.range[0]];\n                    comments.push(comment);\n                }\n                tree.leadingComments = comments;\n            }\n            return tree;\n        }\n\n        for (i = 0, len = providedComments.length; i < len; i += 1) {\n            comments.push(extendCommentRange(deepCopy(providedComments[i]), tokens));\n        }\n\n        // This is based on John Freeman's implementation.\n        cursor = 0;\n        traverse(tree, {\n            enter: function (node) {\n                var comment;\n\n                while (cursor < comments.length) {\n                    comment = comments[cursor];\n                    if (comment.extendedRange[1] > node.range[0]) {\n                        break;\n                    }\n\n                    if (comment.extendedRange[1] === node.range[0]) {\n                        if (!node.leadingComments) {\n                            node.leadingComments = [];\n                        }\n                        node.leadingComments.push(comment);\n                        comments.splice(cursor, 1);\n                    } else {\n                        cursor += 1;\n                    }\n                }\n\n                // already out of owned node\n                if (cursor === comments.length) {\n                    return VisitorOption.Break;\n                }\n\n                if (comments[cursor].extendedRange[0] > node.range[1]) {\n                    return VisitorOption.Skip;\n                }\n            }\n        });\n\n        cursor = 0;\n        traverse(tree, {\n            leave: function (node) {\n                var comment;\n\n                while (cursor < comments.length) {\n                    comment = comments[cursor];\n                    if (node.range[1] < comment.extendedRange[0]) {\n                        break;\n                    }\n\n                    if (node.range[1] === comment.extendedRange[0]) {\n                        if (!node.trailingComments) {\n                            node.trailingComments = [];\n                        }\n                        node.trailingComments.push(comment);\n                        comments.splice(cursor, 1);\n                    } else {\n                        cursor += 1;\n                    }\n                }\n\n                // already out of owned node\n                if (cursor === comments.length) {\n                    return VisitorOption.Break;\n                }\n\n                if (comments[cursor].extendedRange[0] > node.range[1]) {\n                    return VisitorOption.Skip;\n                }\n            }\n        });\n\n        return tree;\n    }\n\n    exports.Syntax = Syntax;\n    exports.traverse = traverse;\n    exports.replace = replace;\n    exports.attachComments = attachComments;\n    exports.VisitorKeys = VisitorKeys;\n    exports.VisitorOption = VisitorOption;\n    exports.Controller = Controller;\n    exports.cloneEnvironment = function () { return clone({}); };\n\n    return exports;\n}(exports));\n/* vim: set sw=4 ts=4 et tw=80 : */\n","/*\n * Generated by PEG.js 0.10.0.\n *\n * http://pegjs.org/\n */\n(function(root, factory) {\n  if (typeof define === \"function\" && define.amd) {\n    define([], factory);\n  } else if (typeof module === \"object\" && module.exports) {\n    module.exports = factory();\n  }\n})(this, function() {\n  \"use strict\";\n\n  function peg$subclass(child, parent) {\n    function ctor() { this.constructor = child; }\n    ctor.prototype = parent.prototype;\n    child.prototype = new ctor();\n  }\n\n  function peg$SyntaxError(message, expected, found, location) {\n    this.message  = message;\n    this.expected = expected;\n    this.found    = found;\n    this.location = location;\n    this.name     = \"SyntaxError\";\n\n    if (typeof Error.captureStackTrace === \"function\") {\n      Error.captureStackTrace(this, peg$SyntaxError);\n    }\n  }\n\n  peg$subclass(peg$SyntaxError, Error);\n\n  peg$SyntaxError.buildMessage = function(expected, found) {\n    var DESCRIBE_EXPECTATION_FNS = {\n          literal: function(expectation) {\n            return \"\\\"\" + literalEscape(expectation.text) + \"\\\"\";\n          },\n\n          \"class\": function(expectation) {\n            var escapedParts = \"\",\n                i;\n\n            for (i = 0; i < expectation.parts.length; i++) {\n              escapedParts += expectation.parts[i] instanceof Array\n                ? classEscape(expectation.parts[i][0]) + \"-\" + classEscape(expectation.parts[i][1])\n                : classEscape(expectation.parts[i]);\n            }\n\n            return \"[\" + (expectation.inverted ? \"^\" : \"\") + escapedParts + \"]\";\n          },\n\n          any: function(expectation) {\n            return \"any character\";\n          },\n\n          end: function(expectation) {\n            return \"end of input\";\n          },\n\n          other: function(expectation) {\n            return expectation.description;\n          }\n        };\n\n    function hex(ch) {\n      return ch.charCodeAt(0).toString(16).toUpperCase();\n    }\n\n    function literalEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\"/g,  '\\\\\"')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function classEscape(s) {\n      return s\n        .replace(/\\\\/g, '\\\\\\\\')\n        .replace(/\\]/g, '\\\\]')\n        .replace(/\\^/g, '\\\\^')\n        .replace(/-/g,  '\\\\-')\n        .replace(/\\0/g, '\\\\0')\n        .replace(/\\t/g, '\\\\t')\n        .replace(/\\n/g, '\\\\n')\n        .replace(/\\r/g, '\\\\r')\n        .replace(/[\\x00-\\x0F]/g,          function(ch) { return '\\\\x0' + hex(ch); })\n        .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return '\\\\x'  + hex(ch); });\n    }\n\n    function describeExpectation(expectation) {\n      return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);\n    }\n\n    function describeExpected(expected) {\n      var descriptions = new Array(expected.length),\n          i, j;\n\n      for (i = 0; i < expected.length; i++) {\n        descriptions[i] = describeExpectation(expected[i]);\n      }\n\n      descriptions.sort();\n\n      if (descriptions.length > 0) {\n        for (i = 1, j = 1; i < descriptions.length; i++) {\n          if (descriptions[i - 1] !== descriptions[i]) {\n            descriptions[j] = descriptions[i];\n            j++;\n          }\n        }\n        descriptions.length = j;\n      }\n\n      switch (descriptions.length) {\n        case 1:\n          return descriptions[0];\n\n        case 2:\n          return descriptions[0] + \" or \" + descriptions[1];\n\n        default:\n          return descriptions.slice(0, -1).join(\", \")\n            + \", or \"\n            + descriptions[descriptions.length - 1];\n      }\n    }\n\n    function describeFound(found) {\n      return found ? \"\\\"\" + literalEscape(found) + \"\\\"\" : \"end of input\";\n    }\n\n    return \"Expected \" + describeExpected(expected) + \" but \" + describeFound(found) + \" found.\";\n  };\n\n  function peg$parse(input, options) {\n    options = options !== void 0 ? options : {};\n\n    var peg$FAILED = {},\n\n        peg$startRuleFunctions = { start: peg$parsestart },\n        peg$startRuleFunction  = peg$parsestart,\n\n        peg$c0 = function(ss) {\n            return ss.length === 1 ? ss[0] : { type: 'matches', selectors: ss };\n          },\n        peg$c1 = function() { return void 0; },\n        peg$c2 = \" \",\n        peg$c3 = peg$literalExpectation(\" \", false),\n        peg$c4 = /^[^ [\\],():#!=><~+.]/,\n        peg$c5 = peg$classExpectation([\" \", \"[\", \"]\", \",\", \"(\", \")\", \":\", \"#\", \"!\", \"=\", \">\", \"<\", \"~\", \"+\", \".\"], true, false),\n        peg$c6 = function(i) { return i.join(''); },\n        peg$c7 = \">\",\n        peg$c8 = peg$literalExpectation(\">\", false),\n        peg$c9 = function() { return 'child'; },\n        peg$c10 = \"~\",\n        peg$c11 = peg$literalExpectation(\"~\", false),\n        peg$c12 = function() { return 'sibling'; },\n        peg$c13 = \"+\",\n        peg$c14 = peg$literalExpectation(\"+\", false),\n        peg$c15 = function() { return 'adjacent'; },\n        peg$c16 = function() { return 'descendant'; },\n        peg$c17 = \",\",\n        peg$c18 = peg$literalExpectation(\",\", false),\n        peg$c19 = function(s, ss) {\n          return [s].concat(ss.map(function (s) { return s[3]; }));\n        },\n        peg$c20 = function(op, s) {\n            if (!op) return s;\n            return { type: op, left: { type: 'exactNode' }, right: s };\n          },\n        peg$c21 = function(a, ops) {\n            return ops.reduce(function (memo, rhs) {\n              return { type: rhs[0], left: memo, right: rhs[1] };\n            }, a);\n          },\n        peg$c22 = \"!\",\n        peg$c23 = peg$literalExpectation(\"!\", false),\n        peg$c24 = function(subject, as) {\n            const b = as.length === 1 ? as[0] : { type: 'compound', selectors: as };\n            if(subject) b.subject = true;\n            return b;\n          },\n        peg$c25 = \"*\",\n        peg$c26 = peg$literalExpectation(\"*\", false),\n        peg$c27 = function(a) { return { type: 'wildcard', value: a }; },\n        peg$c28 = \"#\",\n        peg$c29 = peg$literalExpectation(\"#\", false),\n        peg$c30 = function(i) { return { type: 'identifier', value: i }; },\n        peg$c31 = \"[\",\n        peg$c32 = peg$literalExpectation(\"[\", false),\n        peg$c33 = \"]\",\n        peg$c34 = peg$literalExpectation(\"]\", false),\n        peg$c35 = function(v) { return v; },\n        peg$c36 = /^[><!]/,\n        peg$c37 = peg$classExpectation([\">\", \"<\", \"!\"], false, false),\n        peg$c38 = \"=\",\n        peg$c39 = peg$literalExpectation(\"=\", false),\n        peg$c40 = function(a) { return (a || '') + '='; },\n        peg$c41 = /^[><]/,\n        peg$c42 = peg$classExpectation([\">\", \"<\"], false, false),\n        peg$c43 = \".\",\n        peg$c44 = peg$literalExpectation(\".\", false),\n        peg$c45 = function(a, as) {\n            return [].concat.apply([a], as).join('');\n          },\n        peg$c46 = function(name, op, value) {\n              return { type: 'attribute', name: name, operator: op, value: value };\n            },\n        peg$c47 = function(name) { return { type: 'attribute', name: name }; },\n        peg$c48 = \"\\\"\",\n        peg$c49 = peg$literalExpectation(\"\\\"\", false),\n        peg$c50 = /^[^\\\\\"]/,\n        peg$c51 = peg$classExpectation([\"\\\\\", \"\\\"\"], true, false),\n        peg$c52 = \"\\\\\",\n        peg$c53 = peg$literalExpectation(\"\\\\\", false),\n        peg$c54 = peg$anyExpectation(),\n        peg$c55 = function(a, b) { return a + b; },\n        peg$c56 = function(d) {\n                return { type: 'literal', value: strUnescape(d.join('')) };\n              },\n        peg$c57 = \"'\",\n        peg$c58 = peg$literalExpectation(\"'\", false),\n        peg$c59 = /^[^\\\\']/,\n        peg$c60 = peg$classExpectation([\"\\\\\", \"'\"], true, false),\n        peg$c61 = /^[0-9]/,\n        peg$c62 = peg$classExpectation([[\"0\", \"9\"]], false, false),\n        peg$c63 = function(a, b) {\n                // Can use `a.flat().join('')` once supported\n                const leadingDecimals = a ? [].concat.apply([], a).join('') : '';\n                return { type: 'literal', value: parseFloat(leadingDecimals + b.join('')) };\n              },\n        peg$c64 = function(i) { return { type: 'literal', value: i }; },\n        peg$c65 = \"type(\",\n        peg$c66 = peg$literalExpectation(\"type(\", false),\n        peg$c67 = /^[^ )]/,\n        peg$c68 = peg$classExpectation([\" \", \")\"], true, false),\n        peg$c69 = \")\",\n        peg$c70 = peg$literalExpectation(\")\", false),\n        peg$c71 = function(t) { return { type: 'type', value: t.join('') }; },\n        peg$c72 = /^[imsu]/,\n        peg$c73 = peg$classExpectation([\"i\", \"m\", \"s\", \"u\"], false, false),\n        peg$c74 = \"/\",\n        peg$c75 = peg$literalExpectation(\"/\", false),\n        peg$c76 = /^[^\\/]/,\n        peg$c77 = peg$classExpectation([\"/\"], true, false),\n        peg$c78 = function(d, flgs) { return {\n              type: 'regexp', value: new RegExp(d.join(''), flgs ? flgs.join('') : '') };\n            },\n        peg$c79 = function(i, is) {\n          return { type: 'field', name: is.reduce(function(memo, p){ return memo + p[0] + p[1]; }, i)};\n        },\n        peg$c80 = \":not(\",\n        peg$c81 = peg$literalExpectation(\":not(\", false),\n        peg$c82 = function(ss) { return { type: 'not', selectors: ss }; },\n        peg$c83 = \":matches(\",\n        peg$c84 = peg$literalExpectation(\":matches(\", false),\n        peg$c85 = function(ss) { return { type: 'matches', selectors: ss }; },\n        peg$c86 = \":has(\",\n        peg$c87 = peg$literalExpectation(\":has(\", false),\n        peg$c88 = function(ss) { return { type: 'has', selectors: ss }; },\n        peg$c89 = \":first-child\",\n        peg$c90 = peg$literalExpectation(\":first-child\", false),\n        peg$c91 = function() { return nth(1); },\n        peg$c92 = \":last-child\",\n        peg$c93 = peg$literalExpectation(\":last-child\", false),\n        peg$c94 = function() { return nthLast(1); },\n        peg$c95 = \":nth-child(\",\n        peg$c96 = peg$literalExpectation(\":nth-child(\", false),\n        peg$c97 = function(n) { return nth(parseInt(n.join(''), 10)); },\n        peg$c98 = \":nth-last-child(\",\n        peg$c99 = peg$literalExpectation(\":nth-last-child(\", false),\n        peg$c100 = function(n) { return nthLast(parseInt(n.join(''), 10)); },\n        peg$c101 = \":\",\n        peg$c102 = peg$literalExpectation(\":\", false),\n        peg$c103 = function(c) {\n          return { type: 'class', name: c };\n        },\n\n        peg$currPos          = 0,\n        peg$savedPos         = 0,\n        peg$posDetailsCache  = [{ line: 1, column: 1 }],\n        peg$maxFailPos       = 0,\n        peg$maxFailExpected  = [],\n        peg$silentFails      = 0,\n\n        peg$resultsCache = {},\n\n        peg$result;\n\n    if (\"startRule\" in options) {\n      if (!(options.startRule in peg$startRuleFunctions)) {\n        throw new Error(\"Can't start parsing from rule \\\"\" + options.startRule + \"\\\".\");\n      }\n\n      peg$startRuleFunction = peg$startRuleFunctions[options.startRule];\n    }\n\n    function text() {\n      return input.substring(peg$savedPos, peg$currPos);\n    }\n\n    function location() {\n      return peg$computeLocation(peg$savedPos, peg$currPos);\n    }\n\n    function expected(description, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildStructuredError(\n        [peg$otherExpectation(description)],\n        input.substring(peg$savedPos, peg$currPos),\n        location\n      );\n    }\n\n    function error(message, location) {\n      location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)\n\n      throw peg$buildSimpleError(message, location);\n    }\n\n    function peg$literalExpectation(text, ignoreCase) {\n      return { type: \"literal\", text: text, ignoreCase: ignoreCase };\n    }\n\n    function peg$classExpectation(parts, inverted, ignoreCase) {\n      return { type: \"class\", parts: parts, inverted: inverted, ignoreCase: ignoreCase };\n    }\n\n    function peg$anyExpectation() {\n      return { type: \"any\" };\n    }\n\n    function peg$endExpectation() {\n      return { type: \"end\" };\n    }\n\n    function peg$otherExpectation(description) {\n      return { type: \"other\", description: description };\n    }\n\n    function peg$computePosDetails(pos) {\n      var details = peg$posDetailsCache[pos], p;\n\n      if (details) {\n        return details;\n      } else {\n        p = pos - 1;\n        while (!peg$posDetailsCache[p]) {\n          p--;\n        }\n\n        details = peg$posDetailsCache[p];\n        details = {\n          line:   details.line,\n          column: details.column\n        };\n\n        while (p < pos) {\n          if (input.charCodeAt(p) === 10) {\n            details.line++;\n            details.column = 1;\n          } else {\n            details.column++;\n          }\n\n          p++;\n        }\n\n        peg$posDetailsCache[pos] = details;\n        return details;\n      }\n    }\n\n    function peg$computeLocation(startPos, endPos) {\n      var startPosDetails = peg$computePosDetails(startPos),\n          endPosDetails   = peg$computePosDetails(endPos);\n\n      return {\n        start: {\n          offset: startPos,\n          line:   startPosDetails.line,\n          column: startPosDetails.column\n        },\n        end: {\n          offset: endPos,\n          line:   endPosDetails.line,\n          column: endPosDetails.column\n        }\n      };\n    }\n\n    function peg$fail(expected) {\n      if (peg$currPos < peg$maxFailPos) { return; }\n\n      if (peg$currPos > peg$maxFailPos) {\n        peg$maxFailPos = peg$currPos;\n        peg$maxFailExpected = [];\n      }\n\n      peg$maxFailExpected.push(expected);\n    }\n\n    function peg$buildSimpleError(message, location) {\n      return new peg$SyntaxError(message, null, null, location);\n    }\n\n    function peg$buildStructuredError(expected, found, location) {\n      return new peg$SyntaxError(\n        peg$SyntaxError.buildMessage(expected, found),\n        expected,\n        found,\n        location\n      );\n    }\n\n    function peg$parsestart() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 32 + 0,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselectors();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c0(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c1();\n        }\n        s0 = s1;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parse_() {\n      var s0, s1;\n\n      var key    = peg$currPos * 32 + 1,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (input.charCodeAt(peg$currPos) === 32) {\n        s1 = peg$c2;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c3); }\n      }\n      while (s1 !== peg$FAILED) {\n        s0.push(s1);\n        if (input.charCodeAt(peg$currPos) === 32) {\n          s1 = peg$c2;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c3); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifierName() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 32 + 2,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = [];\n      if (peg$c4.test(input.charAt(peg$currPos))) {\n        s2 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s2 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c5); }\n      }\n      if (s2 !== peg$FAILED) {\n        while (s2 !== peg$FAILED) {\n          s1.push(s2);\n          if (peg$c4.test(input.charAt(peg$currPos))) {\n            s2 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c5); }\n          }\n        }\n      } else {\n        s1 = peg$FAILED;\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c6(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsebinaryOp() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 32 + 3,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parse_();\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 62) {\n          s2 = peg$c7;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c8); }\n        }\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parse_();\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c9();\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parse_();\n        if (s1 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 126) {\n            s2 = peg$c10;\n            peg$currPos++;\n          } else {\n            s2 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c11); }\n          }\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parse_();\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c12();\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parse_();\n          if (s1 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 43) {\n              s2 = peg$c13;\n              peg$currPos++;\n            } else {\n              s2 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c14); }\n            }\n            if (s2 !== peg$FAILED) {\n              s3 = peg$parse_();\n              if (s3 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c15();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n          if (s0 === peg$FAILED) {\n            s0 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 32) {\n              s1 = peg$c2;\n              peg$currPos++;\n            } else {\n              s1 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c3); }\n            }\n            if (s1 !== peg$FAILED) {\n              s2 = peg$parse_();\n              if (s2 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c16();\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 32 + 4,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsehasSelector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parsehasSelector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parsehasSelector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselectors() {\n      var s0, s1, s2, s3, s4, s5, s6, s7;\n\n      var key    = peg$currPos * 32 + 5,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseselector();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parse_();\n        if (s4 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 44) {\n            s5 = peg$c17;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c18); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parse_();\n            if (s6 !== peg$FAILED) {\n              s7 = peg$parseselector();\n              if (s7 !== peg$FAILED) {\n                s4 = [s4, s5, s6, s7];\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parse_();\n          if (s4 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 44) {\n              s5 = peg$c17;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c18); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parse_();\n              if (s6 !== peg$FAILED) {\n                s7 = peg$parseselector();\n                if (s7 !== peg$FAILED) {\n                  s4 = [s4, s5, s6, s7];\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c19(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehasSelector() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 32 + 6,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsebinaryOp();\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseselector();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c20(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseselector() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 7,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parsesequence();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        s4 = peg$parsebinaryOp();\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parsesequence();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          s4 = peg$parsebinaryOp();\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parsesequence();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c21(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsesequence() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 32 + 8,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$parseatom();\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            s3 = peg$parseatom();\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c24(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseatom() {\n      var s0;\n\n      var key    = peg$currPos * 32 + 9,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$parsewildcard();\n      if (s0 === peg$FAILED) {\n        s0 = peg$parseidentifier();\n        if (s0 === peg$FAILED) {\n          s0 = peg$parseattr();\n          if (s0 === peg$FAILED) {\n            s0 = peg$parsefield();\n            if (s0 === peg$FAILED) {\n              s0 = peg$parsenegation();\n              if (s0 === peg$FAILED) {\n                s0 = peg$parsematches();\n                if (s0 === peg$FAILED) {\n                  s0 = peg$parsehas();\n                  if (s0 === peg$FAILED) {\n                    s0 = peg$parsefirstChild();\n                    if (s0 === peg$FAILED) {\n                      s0 = peg$parselastChild();\n                      if (s0 === peg$FAILED) {\n                        s0 = peg$parsenthChild();\n                        if (s0 === peg$FAILED) {\n                          s0 = peg$parsenthLastChild();\n                          if (s0 === peg$FAILED) {\n                            s0 = peg$parseclass();\n                          }\n                        }\n                      }\n                    }\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsewildcard() {\n      var s0, s1;\n\n      var key    = peg$currPos * 32 + 10,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 42) {\n        s1 = peg$c25;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c26); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c27(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseidentifier() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 32 + 11,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 35) {\n        s1 = peg$c28;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c29); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c30(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattr() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 12,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 91) {\n        s1 = peg$c31;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c32); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrValue();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 93) {\n                s5 = peg$c33;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c34); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c35(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 32 + 13,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (peg$c36.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c37); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        if (peg$c41.test(input.charAt(peg$currPos))) {\n          s0 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s0 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c42); }\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrEqOps() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 32 + 14,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 33) {\n        s1 = peg$c22;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c23); }\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 61) {\n          s2 = peg$c38;\n          peg$currPos++;\n        } else {\n          s2 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c39); }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c40(s1);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrName() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 15,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        s3 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s4 = peg$c43;\n          peg$currPos++;\n        } else {\n          s4 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s4 !== peg$FAILED) {\n          s5 = peg$parseidentifierName();\n          if (s5 !== peg$FAILED) {\n            s4 = [s4, s5];\n            s3 = s4;\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s3;\n          s3 = peg$FAILED;\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s4 = peg$c43;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s4 !== peg$FAILED) {\n            s5 = peg$parseidentifierName();\n            if (s5 !== peg$FAILED) {\n              s4 = [s4, s5];\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c45(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseattrValue() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 16,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseattrName();\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseattrEqOps();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              s5 = peg$parsetype();\n              if (s5 === peg$FAILED) {\n                s5 = peg$parseregex();\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c46(s1, s3, s5);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        s1 = peg$parseattrName();\n        if (s1 !== peg$FAILED) {\n          s2 = peg$parse_();\n          if (s2 !== peg$FAILED) {\n            s3 = peg$parseattrOps();\n            if (s3 !== peg$FAILED) {\n              s4 = peg$parse_();\n              if (s4 !== peg$FAILED) {\n                s5 = peg$parsestring();\n                if (s5 === peg$FAILED) {\n                  s5 = peg$parsenumber();\n                  if (s5 === peg$FAILED) {\n                    s5 = peg$parsepath();\n                  }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s0;\n                  s1 = peg$c46(s1, s3, s5);\n                  s0 = s1;\n                } else {\n                  peg$currPos = s0;\n                  s0 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n        if (s0 === peg$FAILED) {\n          s0 = peg$currPos;\n          s1 = peg$parseattrName();\n          if (s1 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c47(s1);\n          }\n          s0 = s1;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsestring() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 17,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 34) {\n        s1 = peg$c48;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c49); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c50.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c51); }\n        }\n        if (s3 === peg$FAILED) {\n          s3 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 92) {\n            s4 = peg$c52;\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c53); }\n          }\n          if (s4 !== peg$FAILED) {\n            if (input.length > peg$currPos) {\n              s5 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c54); }\n            }\n            if (s5 !== peg$FAILED) {\n              peg$savedPos = s3;\n              s4 = peg$c55(s4, s5);\n              s3 = s4;\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s3;\n            s3 = peg$FAILED;\n          }\n        }\n        while (s3 !== peg$FAILED) {\n          s2.push(s3);\n          if (peg$c50.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c51); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 34) {\n            s3 = peg$c48;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c49); }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c56(s2);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n      if (s0 === peg$FAILED) {\n        s0 = peg$currPos;\n        if (input.charCodeAt(peg$currPos) === 39) {\n          s1 = peg$c57;\n          peg$currPos++;\n        } else {\n          s1 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c58); }\n        }\n        if (s1 !== peg$FAILED) {\n          s2 = [];\n          if (peg$c59.test(input.charAt(peg$currPos))) {\n            s3 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c60); }\n          }\n          if (s3 === peg$FAILED) {\n            s3 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 92) {\n              s4 = peg$c52;\n              peg$currPos++;\n            } else {\n              s4 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c53); }\n            }\n            if (s4 !== peg$FAILED) {\n              if (input.length > peg$currPos) {\n                s5 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c54); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s3;\n                s4 = peg$c55(s4, s5);\n                s3 = s4;\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s3;\n              s3 = peg$FAILED;\n            }\n          }\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c59.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c60); }\n            }\n            if (s3 === peg$FAILED) {\n              s3 = peg$currPos;\n              if (input.charCodeAt(peg$currPos) === 92) {\n                s4 = peg$c52;\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c53); }\n              }\n              if (s4 !== peg$FAILED) {\n                if (input.length > peg$currPos) {\n                  s5 = input.charAt(peg$currPos);\n                  peg$currPos++;\n                } else {\n                  s5 = peg$FAILED;\n                  if (peg$silentFails === 0) { peg$fail(peg$c54); }\n                }\n                if (s5 !== peg$FAILED) {\n                  peg$savedPos = s3;\n                  s4 = peg$c55(s4, s5);\n                  s3 = s4;\n                } else {\n                  peg$currPos = s3;\n                  s3 = peg$FAILED;\n                }\n              } else {\n                peg$currPos = s3;\n                s3 = peg$FAILED;\n              }\n            }\n          }\n          if (s2 !== peg$FAILED) {\n            if (input.charCodeAt(peg$currPos) === 39) {\n              s3 = peg$c57;\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c58); }\n            }\n            if (s3 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c56(s2);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenumber() {\n      var s0, s1, s2, s3;\n\n      var key    = peg$currPos * 32 + 18,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$currPos;\n      s2 = [];\n      if (peg$c61.test(input.charAt(peg$currPos))) {\n        s3 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s3 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c62); }\n      }\n      while (s3 !== peg$FAILED) {\n        s2.push(s3);\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n      }\n      if (s2 !== peg$FAILED) {\n        if (input.charCodeAt(peg$currPos) === 46) {\n          s3 = peg$c43;\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c44); }\n        }\n        if (s3 !== peg$FAILED) {\n          s2 = [s2, s3];\n          s1 = s2;\n        } else {\n          peg$currPos = s1;\n          s1 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s1;\n        s1 = peg$FAILED;\n      }\n      if (s1 === peg$FAILED) {\n        s1 = null;\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c61.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c62); }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c61.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c62); }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c63(s1, s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsepath() {\n      var s0, s1;\n\n      var key    = peg$currPos * 32 + 19,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      s1 = peg$parseidentifierName();\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c64(s1);\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsetype() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 20,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c65) {\n        s1 = peg$c65;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c66); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c67.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c68); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c67.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c68); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c71(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseflags() {\n      var s0, s1;\n\n      var key    = peg$currPos * 32 + 21,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = [];\n      if (peg$c72.test(input.charAt(peg$currPos))) {\n        s1 = input.charAt(peg$currPos);\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c73); }\n      }\n      if (s1 !== peg$FAILED) {\n        while (s1 !== peg$FAILED) {\n          s0.push(s1);\n          if (peg$c72.test(input.charAt(peg$currPos))) {\n            s1 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s1 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c73); }\n          }\n        }\n      } else {\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseregex() {\n      var s0, s1, s2, s3, s4;\n\n      var key    = peg$currPos * 32 + 22,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 47) {\n        s1 = peg$c74;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c75); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = [];\n        if (peg$c76.test(input.charAt(peg$currPos))) {\n          s3 = input.charAt(peg$currPos);\n          peg$currPos++;\n        } else {\n          s3 = peg$FAILED;\n          if (peg$silentFails === 0) { peg$fail(peg$c77); }\n        }\n        if (s3 !== peg$FAILED) {\n          while (s3 !== peg$FAILED) {\n            s2.push(s3);\n            if (peg$c76.test(input.charAt(peg$currPos))) {\n              s3 = input.charAt(peg$currPos);\n              peg$currPos++;\n            } else {\n              s3 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c77); }\n            }\n          }\n        } else {\n          s2 = peg$FAILED;\n        }\n        if (s2 !== peg$FAILED) {\n          if (input.charCodeAt(peg$currPos) === 47) {\n            s3 = peg$c74;\n            peg$currPos++;\n          } else {\n            s3 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c75); }\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parseflags();\n            if (s4 === peg$FAILED) {\n              s4 = null;\n            }\n            if (s4 !== peg$FAILED) {\n              peg$savedPos = s0;\n              s1 = peg$c78(s2, s4);\n              s0 = s1;\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefield() {\n      var s0, s1, s2, s3, s4, s5, s6;\n\n      var key    = peg$currPos * 32 + 23,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 46) {\n        s1 = peg$c43;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c44); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          s4 = peg$currPos;\n          if (input.charCodeAt(peg$currPos) === 46) {\n            s5 = peg$c43;\n            peg$currPos++;\n          } else {\n            s5 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c44); }\n          }\n          if (s5 !== peg$FAILED) {\n            s6 = peg$parseidentifierName();\n            if (s6 !== peg$FAILED) {\n              s5 = [s5, s6];\n              s4 = s5;\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s4;\n            s4 = peg$FAILED;\n          }\n          while (s4 !== peg$FAILED) {\n            s3.push(s4);\n            s4 = peg$currPos;\n            if (input.charCodeAt(peg$currPos) === 46) {\n              s5 = peg$c43;\n              peg$currPos++;\n            } else {\n              s5 = peg$FAILED;\n              if (peg$silentFails === 0) { peg$fail(peg$c44); }\n            }\n            if (s5 !== peg$FAILED) {\n              s6 = peg$parseidentifierName();\n              if (s6 !== peg$FAILED) {\n                s5 = [s5, s6];\n                s4 = s5;\n              } else {\n                peg$currPos = s4;\n                s4 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s4;\n              s4 = peg$FAILED;\n            }\n          }\n          if (s3 !== peg$FAILED) {\n            peg$savedPos = s0;\n            s1 = peg$c79(s2, s3);\n            s0 = s1;\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenegation() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 24,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c80) {\n        s1 = peg$c80;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c81); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c82(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsematches() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 25,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 9) === peg$c83) {\n        s1 = peg$c83;\n        peg$currPos += 9;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c84); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parseselectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c85(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsehas() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 26,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 5) === peg$c86) {\n        s1 = peg$c86;\n        peg$currPos += 5;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c87); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = peg$parsehasSelectors();\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c88(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsefirstChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 32 + 27,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 12) === peg$c89) {\n        s1 = peg$c89;\n        peg$currPos += 12;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c90); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c91();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parselastChild() {\n      var s0, s1;\n\n      var key    = peg$currPos * 32 + 28,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c92) {\n        s1 = peg$c92;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c93); }\n      }\n      if (s1 !== peg$FAILED) {\n        peg$savedPos = s0;\n        s1 = peg$c94();\n      }\n      s0 = s1;\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 29,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 11) === peg$c95) {\n        s1 = peg$c95;\n        peg$currPos += 11;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c96); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c97(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parsenthLastChild() {\n      var s0, s1, s2, s3, s4, s5;\n\n      var key    = peg$currPos * 32 + 30,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.substr(peg$currPos, 16) === peg$c98) {\n        s1 = peg$c98;\n        peg$currPos += 16;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c99); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parse_();\n        if (s2 !== peg$FAILED) {\n          s3 = [];\n          if (peg$c61.test(input.charAt(peg$currPos))) {\n            s4 = input.charAt(peg$currPos);\n            peg$currPos++;\n          } else {\n            s4 = peg$FAILED;\n            if (peg$silentFails === 0) { peg$fail(peg$c62); }\n          }\n          if (s4 !== peg$FAILED) {\n            while (s4 !== peg$FAILED) {\n              s3.push(s4);\n              if (peg$c61.test(input.charAt(peg$currPos))) {\n                s4 = input.charAt(peg$currPos);\n                peg$currPos++;\n              } else {\n                s4 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c62); }\n              }\n            }\n          } else {\n            s3 = peg$FAILED;\n          }\n          if (s3 !== peg$FAILED) {\n            s4 = peg$parse_();\n            if (s4 !== peg$FAILED) {\n              if (input.charCodeAt(peg$currPos) === 41) {\n                s5 = peg$c69;\n                peg$currPos++;\n              } else {\n                s5 = peg$FAILED;\n                if (peg$silentFails === 0) { peg$fail(peg$c70); }\n              }\n              if (s5 !== peg$FAILED) {\n                peg$savedPos = s0;\n                s1 = peg$c100(s3);\n                s0 = s1;\n              } else {\n                peg$currPos = s0;\n                s0 = peg$FAILED;\n              }\n            } else {\n              peg$currPos = s0;\n              s0 = peg$FAILED;\n            }\n          } else {\n            peg$currPos = s0;\n            s0 = peg$FAILED;\n          }\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n    function peg$parseclass() {\n      var s0, s1, s2;\n\n      var key    = peg$currPos * 32 + 31,\n          cached = peg$resultsCache[key];\n\n      if (cached) {\n        peg$currPos = cached.nextPos;\n\n        return cached.result;\n      }\n\n      s0 = peg$currPos;\n      if (input.charCodeAt(peg$currPos) === 58) {\n        s1 = peg$c101;\n        peg$currPos++;\n      } else {\n        s1 = peg$FAILED;\n        if (peg$silentFails === 0) { peg$fail(peg$c102); }\n      }\n      if (s1 !== peg$FAILED) {\n        s2 = peg$parseidentifierName();\n        if (s2 !== peg$FAILED) {\n          peg$savedPos = s0;\n          s1 = peg$c103(s2);\n          s0 = s1;\n        } else {\n          peg$currPos = s0;\n          s0 = peg$FAILED;\n        }\n      } else {\n        peg$currPos = s0;\n        s0 = peg$FAILED;\n      }\n\n      peg$resultsCache[key] = { nextPos: peg$currPos, result: s0 };\n\n      return s0;\n    }\n\n\n      function nth(n) { return { type: 'nth-child', index: { type: 'literal', value: n } }; }\n      function nthLast(n) { return { type: 'nth-last-child', index: { type: 'literal', value: n } }; }\n      function strUnescape(s) {\n        return s.replace(/\\\\(.)/g, function(match, ch) {\n          switch(ch) {\n            case 'b': return '\\b';\n            case 'f': return '\\f';\n            case 'n': return '\\n';\n            case 'r': return '\\r';\n            case 't': return '\\t';\n            case 'v': return '\\v';\n            default: return ch;\n          }\n        });\n      }\n\n\n    peg$result = peg$startRuleFunction();\n\n    if (peg$result !== peg$FAILED && peg$currPos === input.length) {\n      return peg$result;\n    } else {\n      if (peg$result !== peg$FAILED && peg$currPos < input.length) {\n        peg$fail(peg$endExpectation());\n      }\n\n      throw peg$buildStructuredError(\n        peg$maxFailExpected,\n        peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,\n        peg$maxFailPos < input.length\n          ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)\n          : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)\n      );\n    }\n  }\n\n  return {\n    SyntaxError: peg$SyntaxError,\n    parse:       peg$parse\n  };\n});\n","/* vim: set sw=4 sts=4 : */\nimport estraverse from 'estraverse';\nimport parser from './parser.js';\n\n/**\n* @typedef {\"LEFT_SIDE\"|\"RIGHT_SIDE\"} Side\n*/\n\nconst LEFT_SIDE = 'LEFT_SIDE';\nconst RIGHT_SIDE = 'RIGHT_SIDE';\n\n/**\n * @external AST\n * @see https://esprima.readthedocs.io/en/latest/syntax-tree-format.html\n */\n\n/**\n * One of the rules of `grammar.pegjs`\n * @typedef {PlainObject} SelectorAST\n * @see grammar.pegjs\n*/\n\n/**\n * The `sequence` production of `grammar.pegjs`\n * @typedef {PlainObject} SelectorSequenceAST\n*/\n\n/**\n * Get the value of a property which may be multiple levels down\n * in the object.\n * @param {?PlainObject} obj\n * @param {string[]} keys\n * @returns {undefined|boolean|string|number|external:AST}\n */\nfunction getPath(obj, keys) {\n    for (let i = 0; i < keys.length; ++i) {\n        if (obj == null) { return obj; }\n        obj = obj[keys[i]];\n    }\n    return obj;\n}\n\n/**\n * Determine whether `node` can be reached by following `path`,\n * starting at `ancestor`.\n * @param {?external:AST} node\n * @param {?external:AST} ancestor\n * @param {string[]} path\n * @param {Integer} fromPathIndex\n * @returns {boolean}\n */\nfunction inPath(node, ancestor, path, fromPathIndex) {\n    let current = ancestor;\n    for (let i = fromPathIndex; i < path.length; ++i) {\n        if (current == null) {\n            return false;\n        }\n        const field = current[path[i]];\n        if (Array.isArray(field)) {\n            for (let k = 0; k < field.length; ++k) {\n                if (inPath(node, field[k], path, i + 1)) {\n                    return true;\n                }\n            }\n            return false;\n        }\n        current = field;\n    }\n    return node === current;\n}\n\n/**\n * A generated matcher function for a selector.\n * @callback SelectorMatcher\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @returns {void}\n*/\n\n/**\n * A WeakMap for holding cached matcher functions for selectors.\n * @type {WeakMap<SelectorAST, SelectorMatcher>}\n*/\nconst MATCHER_CACHE = typeof WeakMap === 'function' ? new WeakMap : null;\n\n/**\n * Look up a matcher function for `selector` in the cache.\n * If it does not exist, generate it with `generateMatcher` and add it to the cache.\n * In engines without WeakMap, the caching is skipped and matchers are generated with every call.\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction getMatcher(selector) {\n    if (selector == null) {\n        return () => true;\n    }\n\n    if (MATCHER_CACHE != null) {\n        let matcher = MATCHER_CACHE.get(selector);\n        if (matcher != null) {\n            return matcher;\n        }\n        matcher = generateMatcher(selector);\n        MATCHER_CACHE.set(selector, matcher);\n        return matcher;\n    }\n\n    return generateMatcher(selector);\n}\n\n/**\n * Create a matcher function for `selector`,\n * @param {?SelectorAST} selector\n * @returns {SelectorMatcher}\n */\nfunction generateMatcher(selector) {\n    switch(selector.type) {\n        case 'wildcard':\n            return () => true;\n\n        case 'identifier': {\n            const value = selector.value.toLowerCase();\n            return (node, ancestry, options) => {\n                const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n                return value === node[nodeTypeKey].toLowerCase();\n            };\n        }\n\n        case 'exactNode':\n            return (node, ancestry) => {\n                return ancestry.length === 0;\n            };\n\n        case 'field': {\n            const path = selector.name.split('.');\n            return (node, ancestry) => {\n                const ancestor = ancestry[path.length - 1];\n                return inPath(node, ancestor, path, 0);\n            };\n        }\n\n        case 'matches': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return true; }\n                }\n                return false;\n            };\n        }\n\n        case 'compound': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (!matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'not': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                for (let i = 0; i < matchers.length; ++i) {\n                    if (matchers[i](node, ancestry, options)) { return false; }\n                }\n                return true;\n            };\n        }\n\n        case 'has': {\n            const matchers = selector.selectors.map(getMatcher);\n            return (node, ancestry, options) => {\n                let result = false;\n\n                const a = [];\n                estraverse.traverse(node, {\n                    enter (node, parent) {\n                        if (parent != null) { a.unshift(parent); }\n\n                        for (let i = 0; i < matchers.length; ++i) {\n                            if (matchers[i](node, a, options)) {\n                                result = true;\n                                this.break();\n                                return;\n                            }\n                        }\n                    },\n                    leave () { a.shift(); },\n                    keys: options && options.visitorKeys,\n                    fallback: options && options.fallback || 'iteration'\n                });\n\n                return result;\n            };\n        }\n\n        case 'child': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (ancestry.length > 0 && right(node, ancestry, options)) {\n                    return left(ancestry[0], ancestry.slice(1), options);\n                }\n                return false;\n            };\n        }\n\n        case 'descendant': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) => {\n                if (right(node, ancestry, options)) {\n                    for (let i = 0, l = ancestry.length; i < l; ++i) {\n                        if (left(ancestry[i], ancestry.slice(i + 1), options)) {\n                            return true;\n                        }\n                    }\n                }\n                return false;\n            };\n        }\n\n        case 'attribute': {\n            const path = selector.name.split('.');\n            switch (selector.operator) {\n                case void 0:\n                    return (node) => getPath(node, path) != null;\n                case '=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => {\n                                const p = getPath(node, path);\n                                return typeof p === 'string' && selector.value.value.test(p);\n                            };\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal === `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value === typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '!=':\n                    switch (selector.value.type) {\n                        case 'regexp':\n                            return (node) => !selector.value.value.test(getPath(node, path));\n                        case 'literal': {\n                            const literal = `${selector.value.value}`;\n                            return (node) => literal !== `${getPath(node, path)}`;\n                        }\n                        case 'type':\n                            return (node) => selector.value.value !== typeof getPath(node, path);\n                    }\n                    throw new Error(`Unknown selector value type: ${selector.value.type}`);\n                case '<=':\n                    return (node) => getPath(node, path) <= selector.value.value;\n                case '<':\n                    return (node) => getPath(node, path) < selector.value.value;\n                case '>':\n                    return (node) => getPath(node, path) > selector.value.value;\n                case '>=':\n                    return (node) => getPath(node, path) >= selector.value.value;\n            }\n            throw new Error(`Unknown operator: ${selector.operator}`);\n        }\n\n        case 'sibling': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    sibling(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.left.subject &&\n                    left(node, ancestry, options) &&\n                    sibling(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'adjacent': {\n            const left = getMatcher(selector.left);\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    adjacent(node, left, ancestry, LEFT_SIDE, options) ||\n                    selector.right.subject &&\n                    left(node, ancestry, options) &&\n                    adjacent(node, right, ancestry, RIGHT_SIDE, options);\n        }\n\n        case 'nth-child': {\n            const nth = selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'nth-last-child': {\n            const nth = -selector.index.value;\n            const right = getMatcher(selector.right);\n            return (node, ancestry, options) =>\n                right(node, ancestry, options) &&\n                    nthChild(node, ancestry, nth, options);\n        }\n\n        case 'class': {\n            \n            const name = selector.name.toLowerCase();\n\n            return (node, ancestry, options) => {\n                \n                if (options && options.matchClass) {\n                    return options.matchClass(selector.name, node, ancestry);\n                }\n                \n                if (options && options.nodeTypeKey) return false;    \n\n                switch(name){\n                    case 'statement':\n                        if(node.type.slice(-9) === 'Statement') return true;\n                        // fallthrough: interface Declaration <: Statement { }\n                    case 'declaration':\n                        return node.type.slice(-11) === 'Declaration';\n                    case 'pattern':\n                        if(node.type.slice(-7) === 'Pattern') return true;\n                        // fallthrough: interface Expression <: Node, Pattern { }\n                    case 'expression':\n                        return node.type.slice(-10) === 'Expression' ||\n                            node.type.slice(-7) === 'Literal' ||\n                            (\n                                node.type === 'Identifier' &&\n                                (ancestry.length === 0 || ancestry[0].type !== 'MetaProperty')\n                            ) ||\n                            node.type === 'MetaProperty';\n                    case 'function':\n                        return node.type === 'FunctionDeclaration' ||\n                            node.type === 'FunctionExpression' ||\n                            node.type === 'ArrowFunctionExpression';\n                }\n                throw new Error(`Unknown class name: ${selector.name}`);\n            };\n        }\n    }\n\n    throw new Error(`Unknown selector type: ${selector.type}`);\n}\n\n/**\n * @callback TraverseOptionFallback\n * @param {external:AST} node The given node.\n * @returns {string[]} An array of visitor keys for the given node.\n */\n\n/**\n * @callback ClassMatcher\n * @param {string} className The name of the class to match.\n * @param {external:AST} node The node to match against.\n * @param {Array<external:AST>} ancestry The ancestry of the node.\n * @returns {boolean} True if the node matches the class, false if not.\n */\n\n/**\n * @typedef {object} ESQueryOptions\n * @property {string} [nodeTypeKey=\"type\"] By passing `nodeTypeKey`, we can allow other ASTs to use ESQuery.\n * @property { { [nodeType: string]: string[] } } [visitorKeys] By passing `visitorKeys` mapping, we can extend the properties of the nodes that traverse the node.\n * @property {TraverseOptionFallback} [fallback] By passing `fallback` option, we can control the properties of traversing nodes when encountering unknown nodes.\n * @property {ClassMatcher} [matchClass] By passing `matchClass` option, we can customize the interpretation of classes.\n */\n\n/**\n * Given a `node` and its ancestors, determine if `node` is matched\n * by `selector`.\n * @param {?external:AST} node\n * @param {?SelectorAST} selector\n * @param {external:AST[]} [ancestry=[]]\n * @param {ESQueryOptions} [options]\n * @throws {Error} Unknowns (operator, class name, selector type, or\n * selector value type)\n * @returns {boolean}\n */\nfunction matches(node, selector, ancestry, options) {\n    if (!selector) { return true; }\n    if (!node) { return false; }\n    if (!ancestry) { ancestry = []; }\n\n    return getMatcher(selector)(node, ancestry, options);\n}\n\n/**\n * Get visitor keys of a given node.\n * @param {external:AST} node The AST node to get keys.\n * @param {ESQueryOptions|undefined} options\n * @returns {string[]} Visitor keys of the node.\n */\nfunction getVisitorKeys(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n\n    const nodeType = node[nodeTypeKey];\n    if (options && options.visitorKeys && options.visitorKeys[nodeType]) {\n        return options.visitorKeys[nodeType];\n    }\n    if (estraverse.VisitorKeys[nodeType]) {\n        return estraverse.VisitorKeys[nodeType];\n    }\n    if (options && typeof options.fallback === 'function') {\n        return options.fallback(node);\n    }\n    // 'iteration' fallback\n    return Object.keys(node).filter(function (key) {\n        return key !== nodeTypeKey;\n    });\n}\n\n\n/**\n * Check whether the given value is an ASTNode or not.\n * @param {any} node The value to check.\n * @param {ESQueryOptions|undefined} options The options to use.\n * @returns {boolean} `true` if the value is an ASTNode.\n */\nfunction isNode(node, options) {\n    const nodeTypeKey = (options && options.nodeTypeKey) || 'type';\n    return node !== null && typeof node === 'object' && typeof node[nodeTypeKey] === 'string';\n}\n\n/**\n * Determines if the given node has a sibling that matches the\n * given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction sibling(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)) {\n            const startIndex = listProp.indexOf(node);\n            if (startIndex < 0) { continue; }\n            let lowerBound, upperBound;\n            if (side === LEFT_SIDE) {\n                lowerBound = 0;\n                upperBound = startIndex;\n            } else {\n                lowerBound = startIndex + 1;\n                upperBound = listProp.length;\n            }\n            for (let k = lowerBound; k < upperBound; ++k) {\n                if (isNode(listProp[k], options) && matcher(listProp[k], ancestry, options)) {\n                    return true;\n                }\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * Determines if the given node has an adjacent sibling that matches\n * the given selector matcher.\n * @param {external:AST} node\n * @param {SelectorMatcher} matcher\n * @param {external:AST[]} ancestry\n * @param {Side} side\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction adjacent(node, matcher, ancestry, side, options) {\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)) {\n            const idx = listProp.indexOf(node);\n            if (idx < 0) { continue; }\n            if (side === LEFT_SIDE && idx > 0 && isNode(listProp[idx - 1], options) && matcher(listProp[idx - 1], ancestry, options)) {\n                return true;\n            }\n            if (side === RIGHT_SIDE && idx < listProp.length - 1 && isNode(listProp[idx + 1], options) &&  matcher(listProp[idx + 1], ancestry, options)) {\n                return true;\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * Determines if the given node is the `nth` child.\n * If `nth` is negative then the position is counted\n * from the end of the list of children.\n * @param {external:AST} node\n * @param {external:AST[]} ancestry\n * @param {Integer} nth\n * @param {ESQueryOptions|undefined} options\n * @returns {boolean}\n */\nfunction nthChild(node, ancestry, nth, options) {\n    if (nth === 0) { return false; }\n    const [parent] = ancestry;\n    if (!parent) { return false; }\n    const keys = getVisitorKeys(parent, options);\n    for (let i = 0; i < keys.length; ++i) {\n        const listProp = parent[keys[i]];\n        if (Array.isArray(listProp)){\n            const idx = nth < 0 ? listProp.length + nth : nth - 1;\n            if (idx >= 0 && idx < listProp.length && listProp[idx] === node) {\n                return true;\n            }\n        }\n    }\n    return false;\n}\n\n/**\n * For each selector node marked as a subject, find the portion of the\n * selector that the subject must match.\n * @param {SelectorAST} selector\n * @param {SelectorAST} [ancestor] Defaults to `selector`\n * @returns {SelectorAST[]}\n */\nfunction subjects(selector, ancestor) {\n    if (selector == null || typeof selector != 'object') { return []; }\n    if (ancestor == null) { ancestor = selector; }\n    const results = selector.subject ? [ancestor] : [];\n    const keys = Object.keys(selector);\n    for (let i = 0; i < keys.length; ++i) {\n        const p = keys[i];\n        const sel = selector[p];\n        results.push(...subjects(sel, p === 'left' ? sel : ancestor));\n    }\n    return results;\n}\n\n/**\n* @callback TraverseVisitor\n* @param {?external:AST} node\n* @param {?external:AST} parent\n* @param {external:AST[]} ancestry\n*/\n\n/**\n * From a JS AST and a selector AST, collect all JS AST nodes that\n * match the selector.\n * @param {external:AST} ast\n * @param {?SelectorAST} selector\n * @param {TraverseVisitor} visitor\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction traverse(ast, selector, visitor, options) {\n    if (!selector) { return; }\n    const ancestry = [];\n    const matcher = getMatcher(selector);\n    const altSubjects = subjects(selector).map(getMatcher);\n    estraverse.traverse(ast, {\n        enter (node, parent) {\n            if (parent != null) { ancestry.unshift(parent); }\n            if (matcher(node, ancestry, options)) {\n                if (altSubjects.length) {\n                    for (let i = 0, l = altSubjects.length; i < l; ++i) {\n                        if (altSubjects[i](node, ancestry, options)) {\n                            visitor(node, parent, ancestry);\n                        }\n                        for (let k = 0, m = ancestry.length; k < m; ++k) {\n                            const succeedingAncestry = ancestry.slice(k + 1);\n                            if (altSubjects[i](ancestry[k], succeedingAncestry, options)) {\n                                visitor(ancestry[k], parent, succeedingAncestry);\n                            }\n                        }\n                    }\n                } else {\n                    visitor(node, parent, ancestry);\n                }\n            }\n        },\n        leave () { ancestry.shift(); },\n        keys: options && options.visitorKeys,\n        fallback: options && options.fallback || 'iteration'\n    });\n}\n\n\n/**\n * From a JS AST and a selector AST, collect all JS AST nodes that\n * match the selector.\n * @param {external:AST} ast\n * @param {?SelectorAST} selector\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction match(ast, selector, options) {\n    const results = [];\n    traverse(ast, selector, function (node) {\n        results.push(node);\n    }, options);\n    return results;\n}\n\n/**\n * Parse a selector string and return its AST.\n * @param {string} selector\n * @returns {SelectorAST}\n */\nfunction parse(selector) {\n    return parser.parse(selector);\n}\n\n/**\n * Query the code AST using the selector string.\n * @param {external:AST} ast\n * @param {string} selector\n * @param {ESQueryOptions} [options]\n * @returns {external:AST[]}\n */\nfunction query(ast, selector, options) {\n    return match(ast, parse(selector), options);\n}\n\nquery.parse = parse;\nquery.match = 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