Class: PluginTool::Minimiser

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

Constant Summary collapse

Context = 
Java::OrgMozillaJavascript::Context

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Minimiser

Returns a new instance of Minimiser.



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

def initialize
  # Load UglifyJS into a JavaScript interpreter
  raise "Another JS Context is active" unless nil == Context.getCurrentContext()
  @cx = Context.enter();
  @cx.setLanguageVersion(Context::VERSION_1_7)
  @javascript_scope = @cx.initStandardObjects()
  ['js_min.js','uglifyjs/parse-js.js','uglifyjs/process.js','uglifyjs/squeeze-more.js'].each do |filename|
    js = File.open("#{File.dirname(__FILE__)}/#{filename}") { |f| f.read }
    @cx.evaluateString(@javascript_scope, js, "<#{filename}>", 1, nil);
  end
  @js_min = @javascript_scope.get("js_min", @javascript_scope);
end

Instance Method Details

#finish ⇒ Object 



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# File 'lib/minimise.rb', line 67

def finish
  Context.exit()
end

#process(data, filename) ⇒ Object 



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# File 'lib/minimise.rb', line 26

def process(data, filename)
  if filename =~ /\.js\z/
    # JavaScript - use UglifyJS loaded into the JavaScript interpreter
    @js_min.call(@cx, @javascript_scope, @javascript_scope, [data])

  elsif filename =~ /\.html\z/
    # Simple processing of HTML
    # Remove HTML comments
    html = data.gsub(/\<\!\-\-.+?\-\-\>/m,'')
    # Remove indents
    html.gsub!(/^\s+/,'')
    # Remove any unnecessary line breaks (fairly conservative)
    html.gsub!(/\>[\r\n]+\</m,'><')
    html.gsub!(/([\>}])[\r\n]+([\<{])/m,'\1\2')
    html

  elsif filename =~ /\.css\z/
    # Simple processing of CSS
    css = data.gsub(/(^|\s)\/\*.+?\*\/($|\s)/m,'') # remove C style comments
    out = []
    css.split(/[\r\n]+/).each do |line|
      line.chomp!; line.gsub!(/^\s+/,''); line.gsub!(/\s+$/,'')
      line.gsub!(/\s+/,' ')       # contract spaces
      line.gsub!(/\s*:\s*/,':')   # remove unnecessary spaces
      if line =~ /\S/
        out << line
      end
    end
    css = out.join("\n")
    # Remove unnecessary line endings
    css.gsub!(/[\r\n]*(\{[^\}]+\})/m) do |m|
      $1.gsub(/[\r\n]/m,'')
    end
    css

  else
    # No processing
    data
  end
end