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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