File:  [gforth] / gforth / wordinfo.fs
Revision 1.9: download - view: text, annotated - select for diffs
Sun Jan 7 17:22:17 1996 UTC (25 years, 2 months ago) by anton
Branches: MAIN
CVS tags: HEAD
added more.fs for people with old terminals.
WORDS and SEE now now respect the terminal size.
a lot of reordering in the Makefile, approaching the GNU standards.
factored NAME>STRING out of many words.
use AC_DECL_SYS_SIGLIST test in configure.in.
removed emitcounter (it was not used anyway).
SYSTEM now unpreps and repreps the terminal.
fixed byg in prims2x.fs.
added NEEDS, ?CSP, !CSP.
rewrote ALIAS?.

    1: \ WORDINFO.FS  V1.0                                    17may93jaw
    2: 
    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: 
   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: 
   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
   35:     cell+ dup c@ $80 and 0=
   36:     IF
   37: 	(name>) @ >name ( use look instead? )
   38:     ELSE
   39: 	drop 0
   40:     THEN ;
   41: 
   42: : var?  ( nfa -- flag )
   43:     cell+ (name>) >code-address dovar: = ;
   44: 
   45: : con?  ( nfa -- flag )
   46:     cell+ (name>) >code-address docon: = ;
   47: 
   48: : user?  ( nfa -- flag )
   49:     cell+ (name>) >code-address douser: = ;
   50: 
   51: : does? ( nfa -- flag )
   52:     \ !! does not work on all installations
   53:     cell+ (name>)
   54:     >code-address ['] bits >code-address = ;
   55: 
   56: : defered? ( nfa -- flag )
   57:     cell+ (name>) >code-address dodefer: = ;
   58: 
   59: : colon? ( nfa -- flag )
   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.
   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
   89: 8 CONSTANT Use#         \ User variable
   90: 
   91: \ Nobody knows:
   92: 
   93: 9 CONSTANT Ali#         \ Alias
   94: 
   95: 10 CONSTANT Str#         \ Structure words
   96: 
   97: 11 CONSTANT Com#        \ Compiler directives : ; POSTPONE
   98: 
   99: CREATE InfoTable
  100:         ' Prim?    A, Pri# ,
  101:         ' Alias?   A, Ali# ,
  102:         ' Con?     A, Con# ,
  103:         ' Var?     A, Var# ,
  104: \        ' Value?  A, Val# ,
  105:         ' Defered? A, Def# ,
  106:         ' Does?    A, Doe# ,
  107:         ' Colon?   A, Col# ,
  108: 	' User?    A, Use# ,
  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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