File:  [gforth] / gforth / look.fs
Revision 1.8: download - view: text, annotated - select for diffs
Sun Jul 6 14:29:33 1997 UTC (25 years, 8 months ago) by jwilke
Branches: MAIN
CVS tags: HEAD
See got some more bug fixes.
Quick changes to let all cross-compile, and fit into ec-version.
These files are still on my ToDo list, changes are not complete now.

\ LOOK.FS      xt -> lfa                               22may93jaw

\ Copyright (C) 1995 Free Software Foundation, Inc.

\ This file is part of Gforth.

\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.

\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ GNU General Public License for more details.

\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

\ Look checks first if the word is a primitive. If yes then the
\ vocabulary in the primitive area is beeing searched, meaning
\ creating for each word a xt and comparing it...

\ If a word is no primitive look searches backwards to find the nfa.
\ Problems: A compiled xt via compile, might be created with noname:
\           a noname: leaves now a empty name field


\ look                                                  17may93jaw

\ rename to discover!!!

: (look)  ( xt startlfa -- lfa flag )
        false swap
        BEGIN @ dup
        WHILE dup name>int
              3 pick = IF nip dup THEN
        drop nip
        dup 0<> ;

\ !!! nicht optimal!
[IFUNDEF] look
[IFUNDEF] dictionary-end  has-rom [ELSE] false [THEN]

: look ( cfa -- lfa flag )
  forth-wordlist @ (look) ;


: PrimStart ['] true >name ;

: look ( cfa -- lfa flag )
        dup dictionary-end forthstart within
	    PrimStart (look)
	    >name dup ??? <>


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