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<h1 class="page-title">Source: collections/VariableDeclarator.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
'use strict';
var _ = require('lodash');
var Collection = require('../Collection');
var NodeCollection = require('./Node');
var matchNode = require('../matchNode');
var recast = require('recast');
var astNodesAreEquivalent = recast.types.astNodesAreEquivalent;
var b = recast.types.builders;
var types = recast.types.namedTypes;
var VariableDeclarator = recast.types.namedTypes.VariableDeclarator;
/**
* @mixin
*/
var globalMethods = {
/**
* Finds all variable declarators, optionally filtered by name.
*
* @param {string} name
* @return {Collection}
*/
findVariableDeclarators: function(name) {
var filter = name ? {id: {name: name}} : null;
return this.find(VariableDeclarator, filter);
}
};
var filterMethods = {
/**
* Returns a function that returns true if the provided path is a variable
* declarator and requires one of the specified module names.
*
* @param {string|Array} names A module name or an array of module names
* @return {Function}
*/
requiresModule: function(names) {
if (names && !Array.isArray(names)) {
names = [names];
}
var requireIdentifier = b.identifier('require');
return function(path) {
var node = path.value;
if (!VariableDeclarator.check(node) ||
!types.CallExpression.check(node.init) ||
!astNodesAreEquivalent(node.init.callee, requireIdentifier)) {
return false;
}
return !names ||
names.some(
n => astNodesAreEquivalent(node.init.arguments[0], b.literal(n))
);
};
}
};
/**
* @mixin
*/
var transformMethods = {
/**
* Renames a variable and all its occurrences.
*
* @param {string} newName
* @return {Collection}
*/
renameTo: function(newName) {
// TODO: Include JSXElements
return this.forEach(function(path) {
var node = path.value;
var oldName = node.id.name;
var rootScope = path.scope;
var rootPath = rootScope.path;
Collection.fromPaths([rootPath])
.find(types.Identifier, {name: oldName})
.filter(function(path) { // ignore non-variables
var parent = path.parent.node;
if (
types.MemberExpression.check(parent) &&
parent.property === path.node &&
!parent.computed
) {
// obj.oldName
return false;
}
if (
types.Property.check(parent) &&
parent.key === path.node &&
!parent.computed
) {
// { oldName: 3 }
return false;
}
if (
types.MethodDefinition.check(parent) &&
parent.key === path.node &&
!parent.computed
) {
// class A() { oldName() {} }
return false;
}
return true;
})
.forEach(function(path) {
var scope = path.scope;
while (scope && scope !== rootScope) {
if (scope.declares(oldName)) {
return;
}
scope = scope.parent;
}
if (scope) { // identifier must refer to declared variable
path.get('name').replace(newName);
}
});
});
}
};
function register() {
NodeCollection.register();
Collection.registerMethods(globalMethods);
Collection.registerMethods(transformMethods, VariableDeclarator);
}
exports.register = _.once(register);
exports.filters = filterMethods;
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-jscodeshift.html">jscodeshift</a></li></ul><h3>Externals</h3><ul><li><a href="external-astTypes.html">astTypes</a></li></ul><h3>Classes</h3><ul><li><a href="Collection.html">Collection</a></li></ul><h3>Mixins</h3><ul><li><a href="globalMethods.html">globalMethods</a></li><li><a href="mutationMethods.html">mutationMethods</a></li><li><a href="transformMethods.html">transformMethods</a></li><li><a href="traversalMethods.html">traversalMethods</a></li></ul><h3>Global</h3><ul><li><a href="global.html#registerMethods">registerMethods</a></li></ul>
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