Class: YMDP::Compressor::Base

Inherits:
Base
  • Object
show all
Defined in:
lib/ymdp/compressor/compressor.rb

Overview

Compresses a file using the specified compressor/minifier (currently YUI Compressor 2.4.2).

Usage

YMDP::Compressor::Base.compress("filename.js", "type" => "js")

YMDP::Compressor::Base.compress("filename.css", "type" => "css")

Outputs the compressed file to path.min.

Options

"type"::              "js" or "css". Identifies the file type.

"obfuscate"::         true or false. Change internal variable names within the code.

"verbose"::           true or false. Output warnings about code quality.

"preserve_semi"::     true or false. Preserve unnecessary semicolons.

TODO: Make it support multiple compressors.

TODO: Convert it to an object, so you instantiate the Compressor class and then call it on a file or a string.

TODO: Get some stringify_keys! action going so you can send in symbols or strings.

Direct Known Subclasses

JavaScript, Stylesheet

Class Method Summary collapse

Methods inherited from Base

#base_path, base_path, #configuration, configuration, configure, #content_variables, display_path, #display_path, #paths, #servers

Class Method Details

.compress(path, options = {}) ⇒ Object 



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# File 'lib/ymdp/compressor/compressor.rb', line 36

def self.compress(path, options={})
  options.stringify_keys!
  compressed_display_path = display_path(path)
  compressed_path = "#{path}.min"

  options["type"] ||= "js"
  options["type"] = options["type"].to_s
  
  # if the compressed_file exists, don't create it again
  #
  unless File.exists?(compressed_path)
    $stdout.print "   #{compressed_display_path}  compressing . . . "
    compressed = ''
  
    # set options and defaults
    #
    if options.delete("obfuscate")
      options["nomunge"] = ""
    end
    if options.delete("verbose")
      options["verbose"] = ""
    end
    options["charset"] = "utf-8"
  
    if options["type"].to_s == "js" && !options["preserve_semi"]
      options["preserve-semi"] = ""
    end
  
    # join the options together for appending to the command line
    #
    options_string = options.map {|k,v| "--#{k} #{v}"}.join(" ")

    
    # call the compressor
    #
    
    compressor_path = File.expand_path("#{File.dirname(__FILE__)}/yuicompressor-2.4.2.jar")
    raise "#{compressor_path} does not exist" unless File.exists?(compressor_path)
    
    command = "java -jar #{compressor_path} #{options_string} #{path} -o #{compressed_path} 2>&1"
    result = F.execute(command, :return => true)
  
    result.split("\n").each do |line|
      if line =~ /\[ERROR\] (\d+):(\d+):(.*)/
        line_number = $1.to_i
        error = "Error at #{compressed_display_path} line #{line_number} character #{$2}: #{$3}"
        error += F.get_line_from_file(path, line_number)
  
        $stdout.puts error
        g(error)
      end
    end
    
    if result =~ /ERROR/
      raise "JavaScript errors in #{compressed_display_path}"
    else
      $stdout.puts "OK"
    end
  end

  # The compressed file should exist now. If it does, use it. If not, raise an error.
  #
  if File.exists?(compressed_path)
    compressed = File.read(compressed_path)
  else
    raise "File does not exist: #{compressed_display_path}"
  end

  compressed      
end