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.



7
8
9
10
11
12
13
14
15
16
17
18
 
# File 'lib/minimise.rb', line 7

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 



61
62
63
 
# File 'lib/minimise.rb', line 61

def finish
  Context.exit()
end

#process(data, filename) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/minimise.rb', line 20

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