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Mon Aug 26 10:07:20 1996 UTC
(25 years ago) by anton
CVS tags: v0-2-1
' and ['] now deliver an error for compile-only words.
renamed special- words into interpret/compile- words.
refactored some of the recent changes.
adapted see to the changes
added way to make a word that defines words with differring
interpretation and compilation code.
1: \ LOOK.FS xt -> lfa 22may93jaw
3: \ Copyright (C) 1995 Free Software Foundation, Inc.
5: \ This file is part of Gforth.
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation; either version 2
10: \ of the License, or (at your option) any later version.
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program; if not, write to the Free Software
19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21: \ Look checks first if the word is a primitive. If yes then the
22: \ vocabulary in the primitive area is beeing searched, meaning
23: \ creating for each word a xt and comparing it...
25: \ If a word is no primitive look searches backwards to find the nfa.
26: \ Problems: A compiled xt via compile, might be created with noname:
27: \ a noname: leaves now a empty name field
31: : PrimStart ['] true >name ;
33: \ look 17may93jaw
35: : (look) ( xt startlfa -- lfa flag )
36: false swap
37: BEGIN @ dup
38: WHILE dup name>int
39: 3 pick = IF nip dup THEN
41: drop nip
42: dup 0<> ;
44: : look ( cfa -- lfa flag )
45: dup forthstart <
47: PrimStart (look)
49: >name dup ??? <>
50: THEN ;