Annotation of gforth/look.fs, revision 1.9
1.1 anton 1: \ LOOK.FS xt -> lfa 22may93jaw
2:
1.3 anton 3: \ Copyright (C) 1995 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
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.
11:
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.
16:
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.
20:
1.1 anton 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...
24:
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
28:
29: decimal
30:
1.8 jwilke 31: \ look 17may93jaw
1.1 anton 32:
1.8 jwilke 33: \ rename to discover!!!
1.1 anton 34:
35: : (look) ( xt startlfa -- lfa flag )
36: false swap
37: BEGIN @ dup
1.5 anton 38: WHILE dup name>int
1.1 anton 39: 3 pick = IF nip dup THEN
40: REPEAT
41: drop nip
42: dup 0<> ;
43:
1.8 jwilke 44:
45: \ !!! nicht optimal!
46: [IFUNDEF] look
1.9 ! jwilke 47: has? ec [IF]
! 48:
! 49: has-rom
1.8 jwilke 50: [IF]
1.9 ! jwilke 51: : look
! 52: dup [ unlock rom-dictionary area lock ]
! 53: literal literal within
! 54: IF
! 55: >name dup ?? <>
! 56: ELSE
! 57: forth-wordlist @ (look)
! 58: THEN ;
! 59: [ELSE]
1.8 jwilke 60: : look ( cfa -- lfa flag )
1.9 ! jwilke 61: >name dup ??? <> ;
! 62: [THEN]
1.8 jwilke 63:
64: [ELSE]
65:
66: : PrimStart ['] true >name ;
67:
1.1 anton 68: : look ( cfa -- lfa flag )
1.9 ! jwilke 69: dup dictionary-end forthstart within
! 70: IF
! 71: PrimStart (look)
! 72: ELSE
! 73: >name dup ??? <>
! 74: THEN ;
1.1 anton 75:
1.8 jwilke 76: [THEN]
77: [THEN]
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