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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
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
path specification:
each path is relative to the reg it references into.
in order to support named subexpressions, most reg classes that participate
in paths (the ones listed below) will also take a subreg of the reg as a path
component. regs that cannot accept a subreg are marked with stars
reg classes participating in paths: and their respective path component:
RegString (=Regexp) backref integer index **
RegSymbol ditto **
RegArray integer index
RegSubseq ditto
RegHash hash key (of something that matched) ...value?
RegObject name (as sym) ...return value?
RegOr integer index
RegAnd ditto
RegXor ditto
RegNot nil only *
RegRepeat integer index *
(not really named) RegProc 1 of above, depending on what it returned
* doesn't take a subreg of the reg as index
** doesn't take a subreg and must be end of path (or before -1)
special components:
-1 means go up one level (like .. in directory paths)
single ________fixed
matchers--v String Array
Integer single single
String multiple single
Regexp variable single
Reg::Subseq var(=>any) var(=>any)
Reg::Array n/a? single
Reg::Hash n/a single
Reg::Repeat var(=>any) var(=>any)
Lookahead/back multiple multiple (0 really)
~single single single
~multiple multiple multiple
~vector multiple multiple (0 really; lookahead automatic)
others n/a single
module Reg
class Instances
class<<self; alias [] new end
def initialize(method)
def unwrap; @method end