Esrecurse

Esrecurse (esrecurse) is ECMAScript recursive traversing functionality.

Example Usage

The following code will output all variables declared at the root of a file.

1esrecurse.visit(ast, {
2    XXXStatement: function (node) {
3        this.visit(node.left);
4        // do something...
5        this.visit(node.right);
6    }
7});

We can use Visitor instance.

1var visitor = new esrecurse.Visitor({
2    XXXStatement: function (node) {
3        this.visit(node.left);
4        // do something...
5        this.visit(node.right);
6    }
7});
8
9visitor.visit(ast);

We can inherit Visitor instance easily.

1function DerivedVisitor() {
2    esrecurse.Visitor.call(/* this for constructor */  this  /* visitor object automatically becomes this. */);
3}
4util.inherits(DerivedVisitor, esrecurse.Visitor);
5DerivedVisitor.prototype.XXXStatement = function (node) {
6    this.visit(node.left);
7    // do something...
8    this.visit(node.right);
9};

And you can invoke default visiting operation inside custom visit operation.

1function DerivedVisitor() {
2    esrecurse.Visitor.call(/* this for constructor */  this  /* visitor object automatically becomes this. */);
3}
4util.inherits(DerivedVisitor, esrecurse.Visitor);
5DerivedVisitor.prototype.XXXStatement = function (node) {
6    // do something...
7    this.visitChildren(node);
8};

License

Copyright (C) 2014 Yusuke Suzuki (twitter: @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 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.