Module: JSMin

Defined in:
lib/vendor/jsmin.rb

Overview

JSMin

Ruby implementation of Douglas Crockford's JavaScript minifier, JSMin.

Author

Ryan Grove (ryan@wonko.com)

Version

1.0.1 (2008-11-10)

Copyright

Copyright (c) 2008 Ryan Grove. All rights reserved.

Website

github.com/rgrove/jsmin

Example

require 'rubygems'
require 'jsmin'

File.open('example.js', 'r') {|file| puts JSMin.minify(file) }

Defined Under Namespace

Classes: ParseError

Constant Summary

CHR_APOS =
"'".freeze
CHR_ASTERISK =
'*'.freeze
CHR_BACKSLASH =
'\\'.freeze
CHR_CR =
"\r".freeze
CHR_FRONTSLASH =
'/'.freeze
CHR_LF =
"\n".freeze
CHR_QUOTE =
'"'.freeze
CHR_SPACE =
' '.freeze
ORD_LF =
?\n
ORD_SPACE =

Prevents editors from removing trailing whitespace

?\
ORD_TILDE =
?~

Class Method Summary (collapse)

Class Method Details

+ (Object) minify(input)

Reads JavaScript from input (which can be a String or an IO object) and returns a String containing minified JS.



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# File 'lib/vendor/jsmin.rb', line 78

def minify(input)
  @js = StringScanner.new(input.is_a?(IO) ? input.read : input.to_s)
  @source = input.is_a?(IO) ? input.inspect : input.to_s[0..100]
  @line = 1

  @a         = "\n"
  @b         = nil
  @lookahead = nil
  @output    = ''

  action_get

  while !@a.nil? do
    case @a
    when CHR_SPACE
      if alphanum?(@b)
        action_output
      else
        action_copy
      end

    when CHR_LF
      if @b == CHR_SPACE
        action_get
      elsif @b =~ /[{\[\(+-]/
        action_output
      else
        if alphanum?(@b)
          action_output
        else
          action_copy
        end
      end

    else
      if @b == CHR_SPACE
        if alphanum?(@a)
          action_output
        else
          action_get
        end
      elsif @b == CHR_LF
        if @a =~ /[}\]\)\\"+-]/
          action_output
        else
          if alphanum?(@a)
            action_output
          else
            action_get
          end
        end
      else
        action_output
      end
    end
  end

  @output
end

+ (Object) raise(err)



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# File 'lib/vendor/jsmin.rb', line 72

def raise(err)
  super ParseError.new(err, @source, @line)
end