Annotation of gforth/wordinfo.fs, revision 1.11
1.1 anton 1: \ WORDINFO.FS V1.0 17may93jaw
2:
1.8 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: \ May be cross-compiled
22: \ If you want check values then exclude comments,
23: \ but keep in mind that this can't be cross-compiled
24:
25: INCLUDE look.fs
26:
27: \ Wordinfo is a tool that checks a nfa
28: \ and finds out what wordtype we have
29: \ it is used in SEE.FS
30:
1.9 anton 31: \ the old alias? did not work and it is not used, so I changed
32: \ it in many respects - anton
33: : alias? ( nfa1 -- nfa2|0 )
34: \ if nfa1 is an alias, nfa2 is the name of the original word
1.11 ! anton 35: cell+ dup c@ alias-mask and 0=
1.9 anton 36: IF
37: (name>) @ >name ( use look instead? )
38: ELSE
39: drop 0
40: THEN ;
1.1 anton 41:
42: : var? ( nfa -- flag )
1.7 anton 43: cell+ (name>) >code-address dovar: = ;
1.1 anton 44:
45: : con? ( nfa -- flag )
1.7 anton 46: cell+ (name>) >code-address docon: = ;
1.1 anton 47:
1.5 pazsan 48: : user? ( nfa -- flag )
1.7 anton 49: cell+ (name>) >code-address douser: = ;
1.5 pazsan 50:
1.1 anton 51: : does? ( nfa -- flag )
1.7 anton 52: \ !! does not work on all installations
53: cell+ (name>)
1.10 anton 54: >code-address ['] spaces >code-address = ;
1.1 anton 55:
56: : defered? ( nfa -- flag )
1.7 anton 57: cell+ (name>) >code-address dodefer: = ;
1.1 anton 58:
59: : colon? ( nfa -- flag )
1.7 anton 60: cell+ (name>) >code-address docol: = ;
61:
62: \ the above words could be factored with create-does>, but this would
63: \ probably make this file incompatible with cross.
1.1 anton 64:
65: \ VALUE VCheck
66:
67: \ : value? ( nfa -- flag )
68: \ dup does?
69: \ IF here @ ['] VCheck cell+ @ =
70: \ dup IF swap (name>) >body @ here ! ELSE nip THEN
71: \ ELSE drop false THEN ;
72:
73: : prim? ( nfa -- flag )
74: name>
75: forthstart u< ;
76:
77: \ None nestable IDs:
78:
79: 1 CONSTANT Pri# \ Primitives
80: 2 CONSTANT Con# \ Constants
81: 3 CONSTANT Var# \ Variables
82: 4 CONSTANT Val# \ Values
83:
84: \ Nestabe IDs:
85:
86: 5 CONSTANT Doe# \ Does part
87: 6 CONSTANT Def# \ Defer
88: 7 CONSTANT Col# \ Colon def
1.5 pazsan 89: 8 CONSTANT Use# \ User variable
1.1 anton 90:
91: \ Nobody knows:
92:
1.5 pazsan 93: 9 CONSTANT Ali# \ Alias
1.1 anton 94:
1.5 pazsan 95: 10 CONSTANT Str# \ Structure words
1.1 anton 96:
1.5 pazsan 97: 11 CONSTANT Com# \ Compiler directives : ; POSTPONE
1.1 anton 98:
99: CREATE InfoTable
1.5 pazsan 100: ' Prim? A, Pri# ,
101: ' Alias? A, Ali# ,
102: ' Con? A, Con# ,
103: ' Var? A, Var# ,
104: \ ' Value? A, Val# ,
1.1 anton 105: ' Defered? A, Def# ,
1.5 pazsan 106: ' Does? A, Doe# ,
107: ' Colon? A, Col# ,
108: ' User? A, Use# ,
1.1 anton 109: 0 ,
110:
111: : WordInfo ( nfa --- code )
112: InfoTable
113: BEGIN dup @ dup
114: WHILE swap 2 cells + swap
115: 2 pick swap execute
116: UNTIL
117: 1 cells - @ nip
118: ELSE
119: 2drop drop 0
120: THEN ;
121:
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