License Content
### Esrecurse [](https://travis-ci.org/estools/esrecurse)
Esrecurse ([esrecurse](https://github.com/estools/esrecurse)) is [ECMAScript](https://www.ecma-international.org/publications/standards/Ecma-262.htm) recursive traversing functionality.
### Example Usage
The following code will output all variables declared at the root of a file.
```javascript esrecurse.visit(ast, { XXXStatement: function (node) { this.visit(node.left); // do something... this.visit(node.right); } }); ```
We can use `Visitor` instance.
```javascript var visitor = new esrecurse.Visitor({ XXXStatement: function (node) { this.visit(node.left); // do something... this.visit(node.right); } });
visitor.visit(ast); ```
We can inherit `Visitor` instance easily.
```javascript class Derived extends esrecurse.Visitor { constructor() { super(null); }
XXXStatement(node) { } } ```
```javascript function DerivedVisitor() { esrecurse.Visitor.call(/* this for constructor */ this /* visitor object automatically becomes this. */); } util.inherits(DerivedVisitor, esrecurse.Visitor); DerivedVisitor.prototype.XXXStatement = function (node) { this.visit(node.left); // do something... this.visit(node.right); }; ```
And you can invoke default visiting operation inside custom visit operation.
```javascript function DerivedVisitor() { esrecurse.Visitor.call(/* this for constructor */ this /* visitor object automatically becomes this. */); } util.inherits(DerivedVisitor, esrecurse.Visitor); DerivedVisitor.prototype.XXXStatement = function (node) { // do something... this.visitChildren(node); }; ```
The `childVisitorKeys` option does customize the behaviour of `this.visitChildren(node)`. We can use user-defined node types.
```javascript // This tree contains a user-defined `TestExpression` node. var tree = { type: 'TestExpression',
// This 'argument' is the property containing the other **node**. argument: { type: 'Literal', value: 20 },
// This 'extended' is the property not containing the other **node**. extended: true }; esrecurse.visit( ast, { Literal: function (node) { // do something... } }, { // Extending the existing traversing rules. childVisitorKeys: { // TargetNodeName: [ 'keys', 'containing', 'the', 'other', '**node**' ] TestExpression: ['argument'] } } ); ```
We can use the `fallback` option as well. If the `fallback` option is `"iteration"`, `esrecurse` would visit all enumerable properties of unknown nodes. Please note circular references cause the stack overflow. AST might have circular references in additional properties for some purpose (e.g. `node.parent`).
```javascript esrecurse.visit( ast, { Literal: function (node) { // do something... } }, { fallback: 'iteration' } ); ```
If the `fallback` option is a function, `esrecurse` calls this function to determine the enumerable properties of unknown nodes. Please note circular references cause the stack overflow. AST might have circular references in additional properties for some purpose (e.g. `node.parent`).
```javascript esrecurse.visit( ast, { Literal: function (node) { // do something... } }, { fallback: function (node) { return Object.keys(node).filter(function(key) { return key !== 'argument' }); } } ); ```
### License
Copyright (C) 2014 [Yusuke Suzuki](https://github.com/Constellation) (twitter: [@Constellation](https://twitter.com/Constellation)) and other contributors.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL