1 files changed, 63 insertions, 0 deletions
diff --git a/lib/rdoc/ri/ri_util.rb b/lib/rdoc/ri/ri_util.rb
new file mode 100644
index 0000000000..07f79b1d62
--- /dev/null
+++ b/lib/rdoc/ri/ri_util.rb
@@ -0,0 +1,63 @@
+######################################################################
+
+class RiError < Exception; end
+#
+# Break argument into its constituent class or module names, an
+# optional method type, and a method name
+
+class NameDescriptor
+
+  attr_reader :class_names
+  attr_reader :method_name
+  attr_reader :is_class_method
+
+  # arg may be
+  # 1. a class or module name (optionally qualified with other class
+  #    or module names (Kernel, File::Stat etc)
+  # 2. a method name
+  # 3. a method name qualified by a optionally fully qualified class
+  #    or module name
+  #
+  # We're fairly casual about delimiters: folks can say Kernel::puts,
+  # Kernel.puts, or Kernel\#puts for example. There's one exception:
+  # if you say IO::read, we look for a class method, but if you
+  # say IO.read, we look for an instance method
+
+  def initialize(arg)
+    @class_names = []
+    separator = "."
+
+    tokens = arg.split(/\b/)
+
+    # Skip leading '::', '#' or '.', but remember it might
+    # be a method name qualifier
+    separator = tokens.shift if tokens[0] =~ /^(\.|::|#)/
+
+    # Skip leading '::', but remember we potentially have an inst
+
+    # leading stuff must be class names
+    
+    while tokens[0] =~ /^[A-Z]/
+      @class_names << tokens.shift
+      unless tokens.empty?
+        separator = tokens.shift
+      end
+    end
+    
+    # Now must have a single token, the method name, or an empty
+    # array
+    unless tokens.empty?
+      @method_name = tokens.shift
+      # We may now have a trailing !, ?, or = to roll into
+      # the method name
+      if !tokens.empty? && tokens[0] =~ /^[!?=]$/
+        @method_name << tokens.shift
+      end
+
+      if @method_name =~ /::|\.|#/ or !tokens.empty?
+        raise RiError.new("Bad argument: #{arg}") 
+      end
+      @is_class_method = separator == "::"
+    end
+  end
+end