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<h1 class="page-title">Source: collections/Node.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 matchNode = require('../matchNode');
var recast = require('recast');
var Node = recast.types.namedTypes.Node;
var types = recast.types.namedTypes;
/**
* @mixin
*/
var traversalMethods = {
/**
* Find nodes of a specific type within the nodes of this collection.
*
* @param {type}
* @param {filter}
* @return {Collection}
*/
find: function(type, filter) {
var paths = [];
var visitorMethodName = 'visit' + type;
var visitor = {};
function visit(path) {
/*jshint validthis:true */
if (!filter || matchNode(path.value, filter)) {
paths.push(path);
}
this.traverse(path);
}
this.__paths.forEach(function(p, i) {
var self = this;
visitor[visitorMethodName] = function(path) {
if (self.__paths[i] === path) {
this.traverse(path);
} else {
return visit.call(this, path);
}
};
recast.visit(p, visitor);
}, this);
return Collection.fromPaths(paths, this, type);
},
/**
* Returns a collection containing the paths that create the scope of the
* currently selected paths. Dedupes the paths.
*
* @return {Collection}
*/
closestScope: function() {
return this.map(path => path.scope && path.scope.path);
},
/**
* Traverse the AST up and finds the closest node of the provided type.
*
* @param {Collection}
* @param {filter}
* @return {Collection}
*/
closest: function(type, filter) {
return this.map(function(path) {
var parent = path.parent;
while (
parent &&
!(
type.check(parent.value) &&
(!filter || matchNode(parent.value, filter))
)
) {
parent = parent.parent;
}
return parent || null;
});
},
/**
* Finds the declaration for each selected path. Useful for member expressions
* or JSXElements. Expects a callback function that maps each path to the name
* to look for.
*
* If the callback returns a falsey value, the element is skipped.
*
* @param {function} nameGetter
*
* @return {Collection}
*/
getVariableDeclarators: function(nameGetter) {
return this.map(function(path) {
/*jshint curly:false*/
var scope = path.scope;
if (!scope) return;
var name = nameGetter.apply(path, arguments);
if (!name) return;
scope = scope.lookup(name);
if (!scope) return;
var bindings = scope.getBindings()[name];
if (!bindings) return;
var decl = Collection.fromPaths(bindings)
.closest(types.VariableDeclarator);
if (decl.length === 1) {
return decl.paths()[0];
}
}, types.VariableDeclarator);
},
};
function toArray(value) {
return Array.isArray(value) ? value : [value];
}
/**
* @mixin
*/
var mutationMethods = {
/**
* Simply replaces the selected nodes with the provided node. If a function
* is provided it is executed for every node and the node is replaced with the
* functions return value.
*
* @param {Node|Array<Node>|function} nodes
* @return {Collection}
*/
replaceWith: function(nodes) {
return this.forEach(function(path, i) {
var newNodes =
(typeof nodes === 'function') ? nodes.call(path, path, i) : nodes;
path.replace.apply(path, toArray(newNodes));
});
},
/**
* Inserts a new node before the current one.
*
* @param {Node|Array<Node>|function} insert
* @return {Collection}
*/
insertBefore: function(insert) {
return this.forEach(function(path, i) {
var newNodes =
(typeof insert === 'function') ? insert.call(path, path, i) : insert;
path.insertBefore.apply(path, toArray(newNodes));
});
},
/**
* Inserts a new node after the current one.
*
* @param {Node|Array<Node>|function} insert
* @return {Collection}
*/
insertAfter: function(insert) {
return this.forEach(function(path, i) {
var newNodes =
(typeof insert === 'function') ? insert.call(path, path, i) : insert;
path.insertAfter.apply(path, toArray(newNodes));
});
},
remove: function() {
return this.forEach(path => path.prune());
}
};
function register() {
Collection.registerMethods(traversalMethods, Node);
Collection.registerMethods(mutationMethods, Node);
Collection.setDefaultCollectionType(Node);
}
exports.register = _.once(register);
</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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