Add CommonMark markdown engine

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/rouge/plugins/common_mark.rb b/lib/rouge/plugins/common_mark.rb
new file mode 100644
index 00000000000..8f9de061124
--- /dev/null
+++ b/lib/rouge/plugins/common_mark.rb
@@ -0,0 +1,20 @@
+# A rouge plugin for CommonMark markdown engine.
+# Used to highlight code generated by CommonMark.
+
+module Rouge
+  module Plugins
+    module CommonMark
+      def code_block(code, language)
+        lexer = Lexer.find_fancy(language, code) || Lexers::PlainText
+
+        formatter = rouge_formatter(lexer)
+        formatter.format(lexer.lex(code))
+      end
+
+      # override this method for custom formatting behavior
+      def rouge_formatter(lexer)
+        Formatters::HTMLLegacy.new(css_class: "highlight #{lexer.tag}")
+      end
+    end
+  end
+end