Class: JSPreprocessor

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

Defined Under Namespace

Classes: MissingDependencyException

Instance Method Summary collapse

Constructor Details

#initialize(env) ⇒ JSPreprocessor

Returns a new instance of JSPreprocessor.



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# File 'lib/JSPreprocessor.rb', line 8

def initialize(env)
  @env = env
  @defines = []
end

Instance Method Details

#process(cwd, main_file) ⇒ Object 



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# File 'lib/JSPreprocessor.rb', line 13

def process(cwd, main_file)
  main = File.open(cwd + main_file).read.split "\n"
  compiled_file = recurse_files(cwd, main).join "\n"
  replace_defines compiled_file
end

#recurse_files(cwd, file) ⇒ Object 



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# File 'lib/JSPreprocessor.rb', line 19

def recurse_files(cwd, file)
  file.each_with_index do |line, index|
    if line.include? '#include'
      if line.include? '<' #inclusion guards, use bower
        if File.file? '.bowerrc' # check if they keep the bower files somewhere else
          bowerrc = JSON.parse File.open('.bowerrc').read
          if !bowerrc['directory'].nil? # if a custom directory has been set
            @bower_dir = bowerrc['directory']
          else
            @bower_dir = 'bower_components'
          end
        else
          @bower_dir = 'bower_components'
        end

        package = line.match(/<(.*)>/)[1]
        bower_json = "#{@bower_dir}/#{package}/bower.json"
        package_json = "#{@bower_dir}/#{package}/package.json"

        if File.exists? bower_json
          json = File.open(bower_json).read
        elsif File.exists? package_json
          json = File.open(package_json).read
        else
          raise MissingDependencyException, "bower.json, package.json is missing, or #{package} does not exist."
        end

        package_path = JSON.parse(json)['main']

        if package_path.class == Array
          package_path.each_with_index do |package, index|
            if package[-2..-1] == 'js'
              package_path = package
              break
            end
          end
        end

        library = File.open "#{@bower_dir}/#{package}/#{package_path}"
        
        if @env == 'development'
          filestamp = "// #{File.basename(library)} at #{Time.now}\n"
          library = library.read
          library.prepend filestamp
        else
          library = library.read
        end

        file[index] = library
      else # this is not an inclusion guard, so it's relative
        to_include = cwd + line[10..-2] + '.js'
        next_wd = Pathname.new(to_include).dirname.to_s + '/'
        next_file = File.open(to_include).read.split("\n")

        if @env == 'development'
          filestamp = "// #{to_include} at #{Time.now}"
          next_file.unshift filestamp
        end

        file[index] = recurse_files next_wd, next_file
      end
    elsif line.include? '#define'
      @defines << line[8..-1].split(' ')
      file.delete_at index
    end
  end
end

#replace_defines(file) ⇒ Object 



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# File 'lib/JSPreprocessor.rb', line 87

def replace_defines(file)
  @defines.each do |definition|
    file.gsub! definition[0], definition[1]
  end

  file
end