Class: SweetJS

Inherits:
Object
  • Object
show all
Defined in:
lib/sweetjs.rb

Constant Summary collapse

VERSION = 
"0.1.0"
REQUIRES = 
%w(underscore escodegen sweet)
Error = 
ExecJS::Error

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.compile(source) ⇒ Object 



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# File 'lib/sweetjs.rb', line 12

def self.compile(source)
  self.new.compile(source)
end

Instance Method Details

#build_context ⇒ Object 



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# File 'lib/sweetjs.rb', line 20

def build_context
  source = (<<-JS)
    var require = (function() {
      var modules = {};
      var require = function(module) {
        return modules[module];
      };
  JS

  REQUIRES.each do |file|
    source << (<<-JS)

      ////////////////////////////////////////////////////////////
      // #{ file }.js START

      modules["#{file}"] = function() {
        var exports = {}, module = {};
        module.exports = exports;

        #{ read_source_file(file) }

        return exports;
      }.call({});

      // #{ file }.js END
    JS
  end
  source << (<<-JS)
      return require;
    }.call(this));
  JS
  ExecJS.compile(source)
end

#compile(source) ⇒ Object 



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# File 'lib/sweetjs.rb', line 58

def compile(source)
  source = source.respond_to?(:read) ? source.read : source.to_s
  js = []
  js << "var sweet = require('sweet');"
  js << "var escodegen = require('escodegen');"
  js << "var source = #{json_encode(source)};"
  js << "var result = escodegen.generate(sweet.parse(source));"
  js << "return result;"
  context.exec js.join("\n")
end

#context ⇒ Object 



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# File 'lib/sweetjs.rb', line 16

def context
  @context ||= build_context
end

#json_encode(obj) ⇒ Object 



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# File 'lib/sweetjs.rb', line 70

def json_encode(obj)
  MultiJson.dump(obj)
end

#read_source_file(name) ⇒ Object 



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# File 'lib/sweetjs.rb', line 54

def read_source_file(name)
  File.open(File.expand_path("../sweetjs/#{name}.js", __FILE__), "r:UTF-8").read
end