Initial version of Dart web components article

src/site/_plugins/code_sample.rb

+# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+module Jekyll
+
+  # This plugin renders a table with code and a running example side by side.
+  class CodeSampleTag < Liquid::Block
+
+    def initialize(tag_name, params, tokens)
+      super
+      @percent = params.strip
+    end
+
+    def render(context)
+      link = ""
+      if @src_url
+        link = "(<a href='#{@src_url}'>see full source</a>)"
+      end
+
+      ("\n\n<table sytle='border:0px'><thead>" +
+        "<tr><td><strong>Source code #{link}</strong>" +
+        "</td><td>" +
+        "</td><td><strong>Try it out...</strong></td></tr>" +
+        "</thead><tbody><tr>" +
+        "<td style='width:#{@percent}%;vertical-align:top;'>" + super.strip +
+        "</td><td style='width:100%;'>" +
+        "</td><td style='vertical-align:top;'>" +
+        "<iframe style='border:none;height:#{@height};width:#{@width};'" +
+        " src='#{@url}'></iframe>" +
+        "</td></tr></tbody></table>\n\n")
+    end
+
+    def unknown_tag(tag, params, tokens)
+      case tag
+        when 'sample'
+          @width, @height, @url = params.split(' ')
+        when 'url'
+          @src_url = params
+        else
+          super
+      end
+    end
+
+  end
+end
+
+Liquid::Template.register_tag('codesample', Jekyll::CodeSampleTag)