1 files changed, 29 insertions, 0 deletions
diff --git a/lib/rdoc/markup/attr_span.rb b/lib/rdoc/markup/attr_span.rb
new file mode 100644
index 0000000000..b5c1b3b7b7
--- /dev/null
+++ b/lib/rdoc/markup/attr_span.rb
@@ -0,0 +1,29 @@
+##
+# An array of attributes which parallels the characters in a string.
+
+class RDoc::Markup::AttrSpan
+
+  ##
+  # Creates a new AttrSpan for +length+ characters
+
+  def initialize(length)
+    @attrs = Array.new(length, 0)
+  end
+
+  ##
+  # Toggles +bits+ from +start+ to +length+
+  def set_attrs(start, length, bits)
+    for i in start ... (start+length)
+      @attrs[i] |= bits
+    end
+  end
+
+  ##
+  # Accesses flags for character +n+
+
+  def [](n)
+    @attrs[n]
+  end
+
+end
+