Pegify

A configurable Browserify transform for PegJS that just works.

Installation

npm install pegify pegjs --save-dev

NOTE: PegJS is not bundled with the transform and must be installed along with Pegify if is not already included in your project. This allows you to select the version of PegJS that works with your project.

Usage

Command Line

Command line usage is as you would expect, just apply it as a transform.

browserify -t pegify myfile.js

Middleware

Here is an example of Pegify being used as Browserify middleware

var bundler = browserify()
  .transform(pegify())
  .add('myfile.js');

After everything is all setup, you are able to require PegJS files.

var parser = require('./path/to/file.pegjs');

parser.parse(/* your langage */);

Configuration

All options provided to Pegify will be sent directly to PegJS. Meaning all options supported by PegJS are automatically supported by Pegify. There is one exception, output is permanently set to source. Along with the standard options provided by PegJS, Pegify itself can be configured.

To set Pegify options, just pass in an options object when the transform is being initialized.

pegify({
    export: 'window.parser',
    extensions: ['.pgjs']
});

All Pegify options can also be included in a .pegifyrc as json.

output = 'source'

This option is locked, and cannot be modified.

export = 'module.exports'

Defines variable that the compiled parser should be exported to. The default is set to commonjs module.export so that it can be injected as a module.

extensions = ['.peg', '.pegjs']

Extensions that Pegify should work on.

Gulp Usage

Pegify will drop in directly into any Browserify build pipeline. Below is just one implementations.

var browserify = require('browserify'),
    gulp = require('gulp'),
    pegify = require('pegify'),
    source = require('vinyl-source-stream');

gulp.task('js', function () {
  var bundler = browserify()
    .add('./main.js')
    .transform(pegify({
      optimize: 'size'
    }));

  return bundler
    .bundle()
    .pipe(source('main.js'))
    .pipe(gulp.dest('./bin'));
});

You may notice that vinyl-source-stream is included after the bundler.bundle. This is due to the differences between Browserify streams and Gulp/Vinyl streams. Browserify streams a bundle as text, while Gulp uses Vinyl streams. This is where vinyl-source-stream comes in, it will convert a text stream into a vinyl stream. Depending on down stream pipes, other stream manipulation may be needed such as buffering.

License

MIT