Implements color parser

Author: zmoazeni

lib/csscss.rb

@@ -13,3 +13,4 @@
 require "csscss/json_reporter"
 
 require "csscss/parser/common"
+require "csscss/parser/color"

lib/csscss/parser/color.rb

@@ -0,0 +1,29 @@
+module Csscss
+  module Parser
+    module Color
+      include Parslet
+      include Common
+
+      rule(:color) { hexcolor | rgb | color_keyword }
+      rule(:rgb) { rgb_with(numbers) | rgb_with(percent) }
+      rule(:hexcolor) { str("#") >> match["a-fA-F0-9"].repeat(1) >> spaces }
+      rule(:color_keyword) {
+        colors = %w(inherit black silver gray white maroon
+        red purple fuchsia green lime olive
+        yellow navy blue teal aqua)
+        colors.map {|c| symbol(c) }.reduce(:|)
+      }
+
+      private
+        def rgb_with(parser)
+          symbol("rgb") >> parens do
+            parser >> spaces >>
+            symbol(",") >>
+            parser >> spaces >>
+            symbol(",") >>
+            parser >> spaces
+          end
+        end
+    end
+  end
+end

test/csscss/parser/color_test.rb

@@ -0,0 +1,51 @@
+require "test_helper"
+
+module Csscss::Parser
+  describe Color do
+    class ColorTest
+      include Color
+    end
+
+    before { @parser = ColorTest.new }
+
+    describe "color" do
+      it "parses color" do
+        @parser.color.must_parse "rgb(123, 222, 444)"
+        @parser.color.must_parse "rgb(123%, 222%, 444%)"
+        @parser.color.must_parse "#ffffff"
+        @parser.color.must_parse "inherit"
+        @parser.color.must_parse "black"
+      end
+    end
+
+    describe "individual rules" do
+      it "parses rgb number color" do
+        @parser.rgb.must_parse "rgb(123, 222, 444)"
+        @parser.rgb.must_parse "rgb  (  123  , 222  , 444  )  "
+        @parser.rgb.must_not_parse "rgb(1aa, 222, 444)"
+      end
+
+      it "parses rgb percentage color" do
+        @parser.rgb.must_parse "rgb(123%, 222%, 444%)"
+        @parser.rgb.must_parse "rgb  (  123%  , 222%  , 444%  )  "
+        @parser.rgb.must_not_parse "rgb(1aa%, 222%, 444%)"
+      end
+
+      it "parses hex colors" do
+        @parser.hexcolor.must_parse "#ffffff"
+        @parser.hexcolor.must_parse "#ffffff  "
+        @parser.hexcolor.must_parse "#fff "
+        @parser.hexcolor.must_parse "#fFF123"
+        @parser.hexcolor.must_not_parse "fFF123"
+      end
+
+      it "parses keyword colors" do
+        @parser.color_keyword.must_parse "inherit"
+        @parser.color_keyword.must_parse "inherit  "
+
+        @parser.color_keyword.must_parse "black"
+        @parser.color_keyword.must_parse "BLACK"
+      end
+    end
+  end
+end