def attr_parser(method, library)
      engine = Engine.new(library)

      #Create a class method to do the parsing.
      define_singleton_method(method) do |src, spec_str|
        engine.do_parse(src, self, spec_str)
      end

      engine
    end
def attr_parser(method, library)
      engine = Engine.new(library)

      #Create a class method to do the parsing.
      define_singleton_method(method) do |src, spec_str|
        engine.do_parse(src, self, spec_str)
      end

      engine
    end
Define a parser for the current class.
<br>Parameters
* method - A symbol used to name the parsing method created by this method.
* library - A hash of parsing rules the define the parsing
  capabilities supported by this parser.
<br>Meta-effects
* Creates a class method (named after the symbol in method) that parses in
  a string and creates an instance of the class. The created method takes
  two parameters:
<br>Meta-method Parameters
* src - A string of formatted data to be parsed.
* spec_str - A format specification string with %x etc qualifiers.
<br>Meta-method Returns
* An instance of the host class.
<br>Returns
* The format engine used by this method.