amber/internal/grunt-tasks/grunt-peg.js

module.exports = function(grunt) {

	var PEG = require('pegjs');

	/**
     Full config looks like this:
     pegjs: {
     my_parser: {
     options: {                       // optional
     cache: true,                   // default: false
     export_var: 'smalltalk.parser' // default: module.exports
     },
   */
  grunt.registerMultiTask('peg', 'Generate JavaScript parser from PEG.js grammar description', function() {
    var options = this.options({
      cache: false,
      output: 'source',
      export_var: 'module.exports'
    });
    var parser = PEG.buildParser(grunt.file.read(this.data.src), options);
    var content = 'define("amber/parser", ["./boot"], function($boot) {\nvar $globals = $boot.globals, nil = $boot.nil;\n'+options.export_var + ' = ' + parser + ';\n});';
    grunt.file.write(this.data.dest, content);
  });
};