Fixing block comment highlighting for block-only languages

Languages without single-line comments (CSS) explode when running
through `highlight`, as the `DIVIDER` mechanism doesn't deal well with
`nil` comment characters.  I've reworked the mechanism such that it
uses multi-line comments when single-line comments aren't available.

lib/rocco.rb

@@ -348,9 +348,17 @@ class Rocco
       to_html.
       split(/\n*<h5>DIVIDER<\/h5>\n*/m)
 
-    # Combine all code blocks into a single big stream and run through either
-    # `pygmentize(1)` or <http://pygments.appspot.com>
-    code_stream = code_blocks.join("\n\n#{@options[:comment_chars][:single]} DIVIDER\n\n")
+    # Combine all code blocks into a single big stream with section dividers and
+    # run through either `pygmentize(1)` or <http://pygments.appspot.com>
+    if not @options[:comment_chars][:single].nil?
+      divider_input = "\n\n#{@options[:comment_chars][:single]} DIVIDER\n\n"
+      divider_output = /\n*<span class="c.?">#{Regexp.escape(@options[:comment_chars][:single])} DIVIDER<\/span>\n*/m
+    else
+      divider_input = "\n\n#{@options[:comment_chars][:multi][:start]}\nDIVIDER\n#{@options[:comment_chars][:multi][:end]}\n\n"
+      divider_output = /\n*<span class="c.?">#{Regexp.escape(@options[:comment_chars][:multi][:start])}<\/span>\n<span class="c.?">DIVIDER<\/span>\n<span class="c.?">#{Regexp.escape(@options[:comment_chars][:multi][:end])}<\/span>\n*/m 
+    end
+
+    code_stream = code_blocks.join( divider_input )
 
     if pygmentize? 
       code_html = highlight_pygmentize(code_stream)
@@ -361,7 +369,7 @@ class Rocco
     # Do some post-processing on the pygments output to split things back
     # into sections and remove partial `<pre>` blocks.
     code_html = code_html.
-      split(/\n*<span class="c.?">#{@options[:comment_chars][:single]} DIVIDER<\/span>\n*/m).
+      split(divider_output).
       map { |code| code.sub(/\n?<div class="highlight"><pre>/m, '') }.
       map { |code| code.sub(/\n?<\/pre><\/div>\n/m, '') }
 

test/test_block_comments.rb

@@ -50,7 +50,7 @@ class RoccoBlockCommentTest < Test::Unit::TestCase
             r.parse( "\"\"\"\n  Comment 1\n\"\"\"\ndef codeblock\nend\n\"\"\"\n  Comment 2\n\"\"\"\nif false\nend" )
         )
     end 
-    def test_language_without_single_line_comments
+    def test_language_without_single_line_comments_parse
         r = Rocco.new( 'test', '', { :language => "css" } ) { "" } # Generate throwaway instance so I can test `parse`
         assert_equal(
             [
@@ -60,4 +60,39 @@ class RoccoBlockCommentTest < Test::Unit::TestCase
             r.parse( "/**\n * Comment 1\n */\ndef codeblock\nend\n/**\n * Comment 2\n */\nif false\nend" )
         )
     end
+    def test_language_without_single_line_comments_split
+        r = Rocco.new( 'test', '', { :language => "css" } ) { "" } # Generate throwaway instance so I can test `parse`
+        assert_equal(
+            [
+              [ "Comment 1", "Comment 2" ],
+              [ "def codeblock\nend", "if false\nend" ]
+            ], 
+            r.split( [
+                [ [ "Comment 1" ], [ "def codeblock", "end" ] ],
+                [ [ "Comment 2" ], [ "if false", "end" ] ]
+            ] )
+        )
+    end
+    def test_language_without_single_line_comments_highlight
+        r = Rocco.new( 'test', '', { :language => "css" } ) { "" } # Generate throwaway instance so I can test `parse`
+        
+        highlighted = r.highlight( r.split( r.parse( "/**\n * This is a comment!\n */\n.rule { goes: here; }\n/**\n * Comment 2\n */\n.rule2 { goes: here; }" ) ) )
+        assert_equal(
+          "<p>This is a comment!</p>",
+          highlighted[0][0]
+        );
+        assert_equal(
+          "<p>Comment 2</p>\n",
+          highlighted[1][0]
+        );
+        assert( 
+          !highlighted[0][1].include?("DIVIDER") &&
+          !highlighted[1][1].include?("DIVIDER"),
+          "`DIVIDER` stripped successfully."
+        )
+        
+        assert( true 
+        );
+    end
+
 end