Minified!

app/controllers/bookmarklets_controller.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

lib/js_min.rb

@@ -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