Class: SC::Builder::Minify

Inherits:
Base
  • Object
show all
Defined in:
lib/sproutcore/builders/minify.rb

Overview

This builder combines several javascript files into a single file. It is used to prepare a single javascript file for production use. This build tool expects the javascript files to have already been processed for any build directives such sc_static().

Instance Attribute Summary

Attributes inherited from Base

#entry

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#joinlines, #readlines, #replace_static_url, #static_url, #writelines

Constructor Details

#initialize(entry = nil, kind = nil) ⇒ Minify

Returns a new instance of Minify.



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# File 'lib/sproutcore/builders/minify.rb', line 25

def initialize(entry=nil, kind=nil)
  super(entry)
  @kind = kind
end

Class Method Details

.build(entry, dst_path, kind) ⇒ Object

main entry called by build tasls



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# File 'lib/sproutcore/builders/minify.rb', line 21

def self.build(entry, dst_path, kind)
  new(entry, kind).build(dst_path)
end

Instance Method Details

#_report_error(output, input_filename, input_filepath) ⇒ Object 



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# File 'lib/sproutcore/builders/minify.rb', line 70

def _report_error(output, input_filename, input_filepath)
  # The output might have some clues to what exactly was wrong, and it'll
  # be convenient for users if we include the subset.  So we'll read the
  # line numbers from any output lines that start with "[ERROR]" those
  # lines, too.
  if output
    parsed_a_line = false
    output.each_line { |output_line|
      output_line = output_line.chomp
      if (output_line =~ /^\[ERROR\] (\d+):(\d+):.*/) != nil
        line_number = $1
        position    = $2
        parsed_a_line = true
        if ( position  &&  position.to_i > 0 )
          # Read just that line and output it.
          # (sed -n '3{;p;q;}' would probably be faster, but not
          # universally available)
          line_number  = line_number.to_i
          line_counter = 1
          begin
            file = File.new(input_filepath, "r")
            outputted_line = false
            previous_line = nil
            while (file_line = file.gets)

              if ( line_counter == line_number )
                message = "YUI compressor error:  #{output_line} on line #{line_number} of #{input_filename}:\n"
                if !previous_line.nil?
                  message += "        [#{line_number - 1}]  #{previous_line}"
                end
                message   += "   -->  [#{line_number}]  #{file_line}"
              
                SC.logger.error message
                outputted_line = true
                break
              else
                previous_line = file_line
              end
              line_counter += 1
            end
            file.close
          rescue => err
            SC.logger.error "Could not read the actual line from the file:  #{err}"
          end
        
          if !outputted_line
            SC.logger.error "YUI compressor error:  #{output_line}, but couldn't read that line in the input file"
          end
        end
      end
    }
  
    # If we didn't handle at least one line of output specially, then
    # just output it all.
    if !parsed_a_line
      SC.logger.error output
    end
  end
end

#build(dst_path) ⇒ Object

override this method in subclasses to actually do build



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# File 'lib/sproutcore/builders/minify.rb', line 31

def build(dst_path)
  send("build_#{@kind}".to_sym, dst_path)
end

#build_css(dst_path) ⇒ Object 



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# File 'lib/sproutcore/builders/minify.rb', line 35

def build_css(dst_path)
   yui_root = File.expand_path(File.join(LIBPATH, '..', 'vendor', 'yui-compressor'))
   jar_path = File.join(yui_root, 'yuicompressor-2.4.2.jar')
   FileUtils.mkdir_p(File.dirname(dst_path)) # make sure loc exists...
   filecompress = "java -jar " + jar_path + " --charset utf-8 --line-break 0 --nomunge --preserve-semi --disable-optimizations " + entry.source_path + " -o \"" + dst_path + "\" 2>&1"
   SC.logger.info  'Compressing CSS with YUI .... '+ dst_path
   SC.logger.debug `#{filecompress}`

   if $?.exitstatus != 0
     _report_error(output, entry.filename, entry.source_path)
     SC.logger.fatal("!!!!YUI compressor failed, please check that your css code is valid.")
     SC.logger.fatal("!!!!Failed compressing CSS... "+ dst_path)
   end
end

#build_javascript(dst_path) ⇒ Object

Minify some javascript by invoking the YUI compressor.



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# File 'lib/sproutcore/builders/minify.rb', line 51

def build_javascript(dst_path)
  yui_root = File.expand_path(File.join(LIBPATH, '..', 'vendor', 'yui-compressor'))
  jar_path = File.join(yui_root, 'yuicompressor-2.4.2.jar')
  FileUtils.mkdir_p(File.dirname(dst_path)) # make sure loc exists...
  filecompress = "java -jar " + jar_path + " --charset utf-8 --line-break 80 " + entry.source_path + " -o \"" + dst_path + "\" 2>&1"
  SC.logger.info  'Compressing with YUI:  '+ dst_path + "..."

  output = `#{filecompress}`      # It'd be nice to just read STDERR, but
                                  # I can't find a reasonable, commonly-
                                  # installed, works-on-all-OSes solution.
  if $?.exitstatus != 0
    _report_error(output, entry.filename, entry.source_path)
    SC.logger.fatal("!!!!YUI compressor failed, please check that your js code is valid")
    SC.logger.fatal("!!!!Failed compressing ... "+ dst_path)
  end
  
end