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Minified!

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1 parent 12e8287 commit 72c23b3ee168aec7905df4a79dd84c7f54f3a96c @nakajima committed May 22, 2010
Showing with 234 additions and 1 deletion.
  1. +1 −1 app/controllers/bookmarklets_controller.rb
  2. +233 −0 lib/js_min.rb
@@ -10,7 +10,7 @@ def show
format.html # show.html.erb
format.js do
@bookmarklet.increment! :count
- render :js => @bookmarklet.code
+ render :js => JsMin.minify(@bookmarklet.code).strip
end
end
end
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@@ -0,0 +1,233 @@
+#--
+# jsmin.rb - Ruby implementation of Douglas Crockford's JSMin.
+#
+# This is a port of jsmin.c, and is distributed under the same terms, which are
+# as follows:
+#
+# Copyright (c) 2002 Douglas Crockford (www.crockford.com)
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# The Software shall be used for Good, not Evil.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#++
+
+require 'strscan'
+
+# = JSMin
+#
+# Ruby implementation of Douglas Crockford's JavaScript minifier, JSMin.
+#
+# Author:: Ryan Grove (mailto:ryan@wonko.com)
+# Version:: 1.0.0 (2008-03-22)
+# Copyright:: Copyright (c) 2008 Ryan Grove. All rights reserved.
+# Website:: http://github.com/rgrove/jsmin/
+#
+# == Example
+#
+# require 'rubygems'
+# require 'jsmin'
+#
+# File.open('example.js', 'r') {|file| puts JSMin.minify(file) }
+#
+module JsMin
+ ORD_LF = "\n"[0].freeze
+ ORD_SPACE = ' '[0].freeze
+
+ class << self
+
+ # Reads JavaScript from +input+ (which can be a String or an IO object) and
+ # returns a String containing minified JS.
+ def minify(input)
+ @js = StringScanner.new(input.is_a?(IO) ? input.read : input.to_s)
+
+ @a = "\n"
+ @b = nil
+ @lookahead = nil
+ @output = ''
+
+ action_get
+
+ while !@a.nil? do
+ case @a
+ when ' '
+ if alphanum?(@b)
+ action_output
+ else
+ action_copy
+ end
+
+ when "\n"
+ if @b == ' '
+ action_get
+ elsif @b =~ /[{\[\(+-]/
+ action_output
+ else
+ if alphanum?(@b)
+ action_output
+ else
+ action_copy
+ end
+ end
+
+ else
+ if @b == ' '
+ if alphanum?(@a)
+ action_output
+ else
+ action_get
+ end
+ elsif @b == "\n"
+ if @a =~ /[}\]\)\\"+-]/
+ action_output
+ else
+ if alphanum?(@a)
+ action_output
+ else
+ action_get
+ end
+ end
+ else
+ action_output
+ end
+ end
+ end
+
+ @output
+ end
+
+ private
+
+ # Corresponds to action(1) in jsmin.c.
+ def action_output
+ @output << @a
+ action_copy
+ end
+
+ # Corresponds to action(2) in jsmin.c.
+ def action_copy
+ @a = @b
+
+ if @a == '\'' || @a == '"'
+ loop do
+ @output << @a
+ @a = get
+
+ break if @a == @b
+
+ if @a[0] <= ORD_LF
+ raise "JSMin parse error: unterminated string literal: #{@a}"
+ end
+
+ if @a == '\\'
+ @output << @a
+ @a = get
+
+ if @a[0] <= ORD_LF
+ raise "JSMin parse error: unterminated string literal: #{@a}"
+ end
+ end
+ end
+ end
+
+ action_get
+ end
+
+ # Corresponds to action(3) in jsmin.c.
+ def action_get
+ @b = nextchar
+
+ if @b == '/' && (@a == "\n" || @a =~ /[\(,=:\[!&|?{};]/)
+ @output << @a
+ @output << @b
+
+ loop do
+ @a = get
+
+ if @a == '/'
+ break
+ elsif @a == '\\'
+ @output << @a
+ @a = get
+ elsif @a[0] <= ORD_LF
+ raise "JSMin parse error: unterminated regular expression " +
+ "literal: #{@a}"
+ end
+
+ @output << @a
+ end
+
+ @b = nextchar
+ end
+ end
+
+ # Returns true if +c+ is a letter, digit, underscore, dollar sign,
+ # backslash, or non-ASCII character.
+ def alphanum?(c)
+ c.is_a?(String) && !c.empty? && (c[0] > 126 || c =~ /[0-9a-z_$\\]/i)
+ end
+
+ # Returns the next character from the input. If the character is a control
+ # character, it will be translated to a space or linefeed.
+ def get
+ c = @lookahead.nil? ? @js.getch : @lookahead
+ @lookahead = nil
+
+ return c if c.nil? || c == "\n" || c[0] >= ORD_SPACE
+ return "\n" if c == "\r"
+ return ' '
+ end
+
+ # Gets the next character, excluding comments.
+ def nextchar
+ c = get
+ return c unless c == '/'
+
+ case peek
+ when '/'
+ loop do
+ c = get
+ return c if c[0] <= ORD_LF
+ end
+
+ when '*'
+ get
+ loop do
+ case get
+ when '*'
+ if peek == '/'
+ get
+ return ' '
+ end
+
+ when nil
+ raise 'JSMin parse error: unterminated comment'
+ end
+ end
+
+ else
+ return c
+ end
+ end
+
+ # Gets the next character without getting it.
+ def peek
+ @lookahead = get
+ end
+ end
+end

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