sfsekaran · March 26, 2012 19:22 · Oct 29, 2011
diff --git a/css_colour_validator.rb b/css_colour_validator.rb
@@ -0,0 +1,8 @@
+# Put this file under Rails.root /lib
+
+class CssColourValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return false unless value
+    record.errors[attribute] << (options[:message] || 'is not a valid CSS colour') unless ::HexadecimalColourValidator.matches?(value) or ::WebSafeColourValidator.matches?(value)
+  end
+end
diff --git a/hexadecimal_colour_validator.rb b/hexadecimal_colour_validator.rb
@@ -0,0 +1,12 @@
+# Put this file under Rails.root /lib
+
+class HexadecimalColourValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    record.errors[attribute] << (options[:message] || 'is not a valid hexadecimal colour') unless self.class.matches?(value)
+  end
+
+  def self.matches?(value)
+    return false unless value
+    /^#(?:[0-9a-f]{3})(?:[0-9a-f]{3})?$/i.match(value).nil? ? false : true
+  end
+end
diff --git a/theme_element.rb b/theme_element.rb
@@ -0,0 +1,3 @@
+class ThemeElement < ActiveRecord::Base
+  validates :value, :css_colour => true
+end
diff --git a/web_safe_colour_validator.rb b/web_safe_colour_validator.rb
@@ -0,0 +1,12 @@
+# Put this file under Rails.root /lib
+
+class WebSafeColourValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    record.errors[attribute] << (options[:message] || 'is not a valid websafe colour') unless self.class.matches?(value)
+  end
+
+  def self.matches?(value)
+    return false unless value
+    %w(aliceblue antiquewhite aqua aquamarine azure beige bisque black blanchedalmond blue blueviolet brown burlywood cadetblue chartreuse chocolate coral cornflowerblue cornsilk crimson cyan darkblue darkcyan darkgoldenrod darkgray darkgrey darkgreen darkkhaki darkmagenta darkolivegreen darkorange darkorchid darkred darksalmon darkseagreen darkslateblue darkslategray darkslategrey darkturquoise darkviolet deeppink deepskyblue dimgray dimgrey dodgerblue firebrick floralwhite forestgreen fuchsia gainsboro ghostwhite gold goldenrod gray grey green greenyellow honeydew hotpink indianred indigo ivory khaki lavender lavenderblush lawngreen lemonchiffon lightblue lightcoral lightcyan lightgoldenrodyellow lightgray lightgrey lightgreen lightpink lightsalmon lightseagreen lightskyblue lightslategray lightslategrey lightsteelblue lightyellow lime limegreen linen magenta maroon mediumaquamarine mediumblue mediumorchid mediumpurple mediumseagreen mediumslateblue mediumspringgreen mediumturquoise mediumvioletred midnightblue mintcream mistyrose moccasin navajowhite navy oldlace olive olivedrab orange orangered orchid palegoldenrod palegreen paleturquoise palevioletred papayawhip peachpuff peru pink plum powderblue purple red rosybrown royalblue saddlebrown salmon sandybrown seagreen seashell sienna silver skyblue slateblue slategray slategrey snow springgreen steelblue tan teal thistle tomato turquoise violet wheat white whitesmoke yellow yellowgreen).include? value.downcase
+  end
+end