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regknows.rb
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regknows.rb
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=begin copyright
reg - the ruby extended grammar
Copyright (C) 2005 Caleb Clausen
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
=end
module Reg
class Knows
include Reg
attr :sym
def initialize(sym)
@sym=sym
super
end
def === (obj)
obj.respond_to? @sym
end
def [] *args
Args.new(sym,*args)
end
def -@; self end
def inspect
"-:#{sym}"
end
#(also, the usual [] => new alias)
class<< self
alias[]new
end
class Args < Knows
attr :argsreg
def initialize(sym,*argsreg)
super sym
@argsreg=::Reg[*argsreg]
end
def inspect
":#{sym}"+@argsreg.inspect[1..-1]
end
def ===(obj)
super and huh "need some more help here"
end
def -@; self end
end
end
end