basant307/AI_Governance_Project

1/*2  Copyright (C) 2014 Yusuke Suzuki <utatane.tea@gmail.com>3 4  Redistribution and use in source and binary forms, with or without5  modification, are permitted provided that the following conditions are met:6 7    * Redistributions of source code must retain the above copyright8      notice, this list of conditions and the following disclaimer.9    * Redistributions in binary form must reproduce the above copyright10      notice, this list of conditions and the following disclaimer in the11      documentation and/or other materials provided with the distribution.12 13  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"14  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE15  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE16  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY17  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES18  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;19  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND20  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT21  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF22  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.23*/24(function () {25    'use strict';26 27    var estraverse = require('estraverse');28 29    function isNode(node) {30        if (node == null) {31            return false;32        }33        return typeof node === 'object' && typeof node.type === 'string';34    }35 36    function isProperty(nodeType, key) {37        return (nodeType === estraverse.Syntax.ObjectExpression || nodeType === estraverse.Syntax.ObjectPattern) && key === 'properties';38    }39 40    function Visitor(visitor, options) {41        options = options || {};42 43        this.__visitor = visitor ||  this;44        this.__childVisitorKeys = options.childVisitorKeys45            ? Object.assign({}, estraverse.VisitorKeys, options.childVisitorKeys)46            : estraverse.VisitorKeys;47        if (options.fallback === 'iteration') {48            this.__fallback = Object.keys;49        } else if (typeof options.fallback === 'function') {50            this.__fallback = options.fallback;51        }52    }53 54    /* Default method for visiting children.55     * When you need to call default visiting operation inside custom visiting56     * operation, you can use it with `this.visitChildren(node)`.57     */58    Visitor.prototype.visitChildren = function (node) {59        var type, children, i, iz, j, jz, child;60 61        if (node == null) {62            return;63        }64 65        type = node.type || estraverse.Syntax.Property;66 67        children = this.__childVisitorKeys[type];68        if (!children) {69            if (this.__fallback) {70                children = this.__fallback(node);71            } else {72                throw new Error('Unknown node type ' + type + '.');73            }74        }75 76        for (i = 0, iz = children.length; i < iz; ++i) {77            child = node[children[i]];78            if (child) {79                if (Array.isArray(child)) {80                    for (j = 0, jz = child.length; j < jz; ++j) {81                        if (child[j]) {82                            if (isNode(child[j]) || isProperty(type, children[i])) {83                                this.visit(child[j]);84                            }85                        }86                    }87                } else if (isNode(child)) {88                    this.visit(child);89                }90            }91        }92    };93 94    /* Dispatching node. */95    Visitor.prototype.visit = function (node) {96        var type;97 98        if (node == null) {99            return;100        }101 102        type = node.type || estraverse.Syntax.Property;103        if (this.__visitor[type]) {104            this.__visitor[type].call(this, node);105            return;106        }107        this.visitChildren(node);108    };109 110    exports.version = require('./package.json').version;111    exports.Visitor = Visitor;112    exports.visit = function (node, visitor, options) {113        var v = new Visitor(visitor, options);114        v.visit(node);115    };116}());117/* vim: set sw=4 ts=4 et tw=80 : */118