Initial version of Dart web components article

src/site/_plugins/code_sample.rb

+

[Jennifer Messerly, 2012/10/10 02:37:20]

copyright header?

(p.s. sorry I forgot to review this file the first time!)

[Siggi Cherem (dart-lang), 2012/10/10 17:20:55]

Done.

+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 != nil

[Jennifer Messerly, 2012/10/10 02:37:20]

I think in Ruby, you'd typically write:

if @src_url
 ...
end

[Siggi Cherem (dart-lang), 2012/10/10 17:20:55]

Done.

+        link = "(<a href='#{@src_url}'>see complete source</a>)"
+      end
+
+      ("\n\n<table sytle='border:0px'><thead>" + 

[Jennifer Messerly, 2012/10/10 02:37:20]

nit: you don't need the +, Ruby will concat adjacent string literals like Dart
:)

[Siggi Cherem (dart-lang), 2012/10/10 17:20:55]

mmm.. this didn't work for me, the render method returns only the last segment
of the string, is there something special when you add new lines in between? I
thought () would do the trick, but apparently not.

[Jennifer Messerly, 2012/10/10 17:48:03]

doh, I guess you need to escape the end of line with backslash. Nevermind then
:)

alternative would be to let the string continue or use a heredoc, but then you
couldn't indent it nicely, it would have to be flush with the left side (or your
output would get indent).

+        "<tr><td><strong>Sample source code #{link}</strong>" + 
+        "</td><td>" +
+        "</td><td><strong>Sample running</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'
+          sample_params = params.split(' ')

[Jennifer Messerly, 2012/10/10 02:37:20]

common to write this as:

@width, @height, @url = params.split(' ')

[Siggi Cherem (dart-lang), 2012/10/10 17:20:55]

cool. I'd really like to have this in dart... 

+          @width = sample_params[0]
+          @height = sample_params[1]
+          @url = sample_params[2]
+        when 'url'
+          @src_url = params
+        else
+          super
+      end
+    end
+
+  end
+end
+
+Liquid::Template.register_tag('codesample', Jekyll::CodeSampleTag)