### Esrecurse [![Build Status](https://travis-ci.org/estools/esrecurse.svg?branch=master)](https://travis-ci.org/estools/esrecurse)

Esrecurse ([esrecurse](https://github.com/estools/esrecurse)) is

[ECMAScript](http://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

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 behavoir 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 <COPYRIGHT HOLDER> BE LIABLE FOR ANY

DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.