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117 行
4.1 KiB
117 行
4.1 KiB
/*
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Copyright (C) 2014 Yusuke Suzuki <utatane.tea@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function () {
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'use strict';
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var estraverse = require('estraverse');
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function isNode(node) {
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if (node == null) {
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return false;
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}
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return typeof node === 'object' && typeof node.type === 'string';
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}
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function isProperty(nodeType, key) {
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return (nodeType === estraverse.Syntax.ObjectExpression || nodeType === estraverse.Syntax.ObjectPattern) && key === 'properties';
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}
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function Visitor(visitor, options) {
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options = options || {};
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this.__visitor = visitor || this;
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this.__childVisitorKeys = options.childVisitorKeys
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? Object.assign({}, estraverse.VisitorKeys, options.childVisitorKeys)
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: estraverse.VisitorKeys;
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if (options.fallback === 'iteration') {
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this.__fallback = Object.keys;
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} else if (typeof options.fallback === 'function') {
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this.__fallback = options.fallback;
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}
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}
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/* Default method for visiting children.
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* When you need to call default visiting operation inside custom visiting
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* operation, you can use it with `this.visitChildren(node)`.
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*/
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Visitor.prototype.visitChildren = function (node) {
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var type, children, i, iz, j, jz, child;
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if (node == null) {
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return;
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}
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type = node.type || estraverse.Syntax.Property;
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children = this.__childVisitorKeys[type];
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if (!children) {
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if (this.__fallback) {
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children = this.__fallback(node);
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} else {
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throw new Error('Unknown node type ' + type + '.');
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}
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}
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for (i = 0, iz = children.length; i < iz; ++i) {
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child = node[children[i]];
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if (child) {
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if (Array.isArray(child)) {
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for (j = 0, jz = child.length; j < jz; ++j) {
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if (child[j]) {
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if (isNode(child[j]) || isProperty(type, children[i])) {
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this.visit(child[j]);
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}
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}
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}
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} else if (isNode(child)) {
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this.visit(child);
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}
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}
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}
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};
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/* Dispatching node. */
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Visitor.prototype.visit = function (node) {
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var type;
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if (node == null) {
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return;
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}
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type = node.type || estraverse.Syntax.Property;
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if (this.__visitor[type]) {
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this.__visitor[type].call(this, node);
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return;
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}
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this.visitChildren(node);
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};
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exports.version = require('./package.json').version;
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exports.Visitor = Visitor;
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exports.visit = function (node, visitor, options) {
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var v = new Visitor(visitor, options);
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v.visit(node);
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};
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}());
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/* vim: set sw=4 ts=4 et tw=80 : */
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