1 files changed, 30 insertions, 0 deletions
diff --git a/sample/ripper/colorize.rb b/sample/ripper/colorize.rb
new file mode 100644
index 0000000000..505e757013
--- /dev/null
+++ b/sample/ripper/colorize.rb
@@ -0,0 +1,30 @@
+require 'ripper/filter'
+
+class ColorizeFilter < Ripper::Filter
+  def on_default(event, tok, f)
+    f << escape(tok)
+  end
+
+  def on_comment(tok, f)
+    f << %Q[<span class="comment">#{escape(tok)}</span>]
+  end
+
+  def on_tstring_content(tok, f)
+    f << %Q[<span class="string">#{escape(tok)}</span>]
+  end
+
+  ESC = {
+    '&' => '&amp;',
+    '<' => '&lt;',
+    '>' => '&gt;'
+  }
+
+  def escape(str)
+    tbl = ESC
+    str.gsub(/[&<>]/) {|ch| tbl[ch] }
+  end
+end
+
+if $0 == __FILE__
+  ColorizeFilter.new(ARGF).parse($stdout)
+end