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transform the ast on a recursive walk
Tag: 0.0.2

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README.markdown

falafel

Transform the ast on a recursive walk.

build status

This module is like burrito, except that it uses esprima instead of uglify for friendlier-looking ast nodes.

example

array.js

Put a function wrapper around all array literals.

var falafel = require('falafel');

var src = '(' + function () {
    var xs = [ 1, 2, [ 3, 4 ] ];
    var ys = [ 5, 6 ];
    console.dir([ xs, ys ]);
} + ')()';

var output = falafel(src, function (node) {
    if (node.type === 'ArrayExpression') {
        node.update('fn(' + node.source() + ')');
    }
});
console.log(output);

output:

(function () {
    var xs = fn([ 1, 2, fn([ 3, 4 ]) ]);
    var ys = fn([ 5, 6 ]);
    console.dir(fn([ xs, ys ]));
})()

methods

var falafel = require('falafel')

falafel(src, fn)

Transform the string source src with the function fn, returning the transformed string output.

For every node in the ast, fn(node) fires. The recursive walk is a pre-traversal, so children get called before their parents.

Performing a pre-traversal makes it easier to write nested transforms since transforming parents often requires transforming all its children first.

If typeof src === 'object', then src.source will be used for the source and the rest of the options will be passed directly along to esprima except for 'range' which is always turned on because falafel needs it.

Some of the options you might want from esprima includes: 'loc', 'raw', 'comments', 'tokens', and 'tolerant'.

nodes

Aside from the regular esprima data, you can also call some inserted methods on nodes.

Aside from updating the current node, you can also reach into sub-nodes to call update functions on children from parent nodes.

node.source()

Return the source for the given node, including any modifications made to children nodes.

node.update(s)

Transform the source for the present node to the string s.

node.parent

Reference to the parent element or null at the root element.

install

With npm do:

npm install falafel

license

MIT

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