Adding escaped characters and tests, small optimization.

Escaped characters only apply inside templates.  I think this breaks \| outside
of templates though.  Ugh.

lib/marker.rb

@@ -22,6 +22,8 @@
 
 require 'marker/language'
 
+$stderr.puts "loading Marker at #{__FILE__}"
+
 #:include:README
 module Marker
   class << self

lib/marker/language.treetop

@@ -477,6 +477,8 @@ module Marker
       /
       url
       /
+      escaped_char
+      /
       plain_word
       /
       bold_toggle # allow unmatched delimiters after we have ruled out structures
@@ -517,13 +519,7 @@ module Marker
     # end
     # }}
     rule plain_word
-      (!delimiter ![ \t\r\n] .)+ <Word>
-      /
-      "\\\\" <Word> # fixup vim syntax --> "
-      /
-      "\\|" <Word>
-      /
-      "\\=" <Word>
+      (!delimiter [^ \t\r\n])+ <Word>
     end
 
     ##### delimiters
@@ -551,6 +547,8 @@ module Marker
       arg_delimiter
       /
       term_delimiter
+      /
+      escaped_char
     end
 
     rule bold_toggle
@@ -659,6 +657,14 @@ module Marker
 #      [A-Z_]+
 #    end
 
+    rule escaped_char
+      "\\\\" <Escaped> # fix vim highlighting => "
+      /
+      "\\|" <Escaped>
+      /
+      "\\=" <Escaped>
+    end
+
     rule number
       [1-9] digit* {
         def to_i

lib/marker/text.rb

@@ -74,6 +74,16 @@ def to_s( options = {} )
     end
   end
 
+  class Escaped < ParseNode
+    def to_html( options = {} )
+      text_value.slice(-1,1)
+    end
+
+    def to_s( options = {} )
+      text_value.slice(-1,1)
+    end
+  end
+
   class HorizRule < ParseNode
     def to_html( options = {} )
       "<hr />" +

test/templates_test.rb

@@ -52,4 +52,14 @@ def test_rendered_args
     assert_match("<p>render:template( :html, [\"<a href='http://www.example.com'>Example</a>\"], {} )</p>", markup.to_html)
   end
 
+  def test_escaped_characters
+    # the single quotes are important here, to make sure the "\" are in the actual text
+    # this test is messed up right now.  we should have a way to send a single
+    # '\' through, but ruby seems to have errors with it!  for now, just removing that case.
+    text = '{{ template | \| | a \= b | \|a, b\| }}'
+    markup = Marker.parse text
+
+    assert_match('<p>render:template( :html, ["|", "a = b", "|a, b|"], {} )</p>', markup.to_html)
+  end
+
 end

test/test_helper.rb

@@ -1,2 +1,2 @@
 require 'test/unit'
-$LOAD_PATH << File.expand_path( File.dirname(__FILE__) + '/../lib' )
+$LOAD_PATH.unshift File.expand_path( File.dirname(__FILE__) + '/../lib' )