Index: hikidoc.rb
===================================================================
--- hikidoc.rb	(リビジョン 57220)
+++ hikidoc.rb	(リビジョン 57222)
@@ -415,6 +415,7 @@
   #
 
   BRACKET_LINK_RE = /\[\[.+?\]\]/
+  RUBY_RE = /\(\(.+?\)\)/
   URI_RE = /(?:https?|ftp|file|mailto|javascript):[A-Za-z0-9;\/?:@&=+$,\-_.!~*\'()#%]+/
   WIKI_NAME_RE = /\b(?:[A-Z]+[a-z\d]+){2,}\b/
 
@@ -422,12 +423,14 @@
     if @options[:use_wiki_name]
       if @options[:use_not_wiki_name]
         / (#{BRACKET_LINK_RE})
+        | (#{RUBY_RE})
         | (#{URI_RE})
         | (#{MODIFIER_RE})
         | (\^?#{WIKI_NAME_RE})
         /xo
       else
         / (#{BRACKET_LINK_RE})
+        | (#{RUBY_RE})
         | (#{URI_RE})
         | (#{MODIFIER_RE})
         | (#{WIKI_NAME_RE})
@@ -435,6 +438,7 @@
       end
     else
       / (#{BRACKET_LINK_RE})
+      | (#{RUBY_RE})
       | (#{URI_RE})
       | (#{MODIFIER_RE})
       /xo
@@ -448,7 +452,7 @@
     while m = re.match(str)
       str = m.post_match
 
-      link, uri, mod, wiki_name = m[1, 4]
+      link, ruby, uri, mod, wiki_name = m[1, 5]
       if wiki_name and wiki_name[0, 1] == "^"
         pending_str = m.pre_match + wiki_name[1..-1] + str
         next
@@ -457,16 +461,18 @@
       pre_str = "#{pending_str}#{m.pre_match}"
       pending_str = nil
       evaluate_plugin_block(pre_str, buf)
-      compile_inline_markup(buf, link, uri, mod, wiki_name)
+      compile_inline_markup(buf, link, ruby, uri, mod, wiki_name)
     end
     evaluate_plugin_block(pending_str || str, buf)
     buf
   end
 
-  def compile_inline_markup(buf, link, uri, mod, wiki_name)
+  def compile_inline_markup(buf, link, ruby, uri, mod, wiki_name)
     case
     when link
       buf << compile_bracket_link(link[2...-2])
+    when ruby
+      buf << compile_ruby(ruby[2...-2])
     when uri
       buf << compile_uri_autolink(uri)
     when mod
@@ -502,6 +508,12 @@
     image?(uri) and @options[:allow_bracket_inline_image]
   end
 
+  def compile_ruby(ruby)
+    rb, *rt = *ruby.split(")(", 3).map{|_| compile_inline(_) }
+    # rb, rtは rubyを含んではいけないけど compile_inlineは rubyを作りうる。とりあえず気にしない。
+    @output.ruby(rb, *rt)
+  end
+
   def compile_uri_autolink(uri)
     if image?(uri)
       @output.image_hyperlink(fix_uri(uri))
@@ -746,6 +758,28 @@
       %Q(<a href="#{escape_html_param(uri)}">#{title}</a>)
     end
 
+    def ruby(rb, *rt)
+      case rt.length
+      when 0
+        $stderr.puts("possibly unintentional ruby markup.")
+        "((#{rb}))"
+      when 1
+        "<ruby>"+
+          "<rb>#{rb}</rb>"+
+          "<rp>(</rp>"+
+          "<rt>#{rt[0]}</rt>"+
+          "<rp>)</rp>"+
+        "</ruby>"
+      else
+        "<ruby>"+
+          "<rbc><rb>#{rb}</rb></rbc>"+
+          "<rp>(</rp>"+
+          rt.map{|_| "<rtc><rt>#{_}</rt></rtc>" }.join("<rp> / </rp>")+
+          "<rp>)</rp>"+
+        "</ruby>"
+      end
+    end
+
     def wiki_name(name)
       hyperlink(name, text(name))
     end