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Annotation of gforth/look.fs, revision 1.8

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
        !            47: [IFUNDEF] dictionary-end  has-rom [ELSE] false [THEN]
        !            48: [IF]
        !            49: 
        !            50: : look ( cfa -- lfa flag )
        !            51:   forth-wordlist @ (look) ;
        !            52: 
        !            53: [ELSE]
        !            54: 
        !            55: : PrimStart ['] true >name ;
        !            56: 
1.1       anton      57: : look ( cfa -- lfa flag )
1.7       anton      58:         dup dictionary-end forthstart within
1.6       anton      59:        IF
                     60:            PrimStart (look)
                     61:        ELSE
                     62:            >name dup ??? <>
                     63:        THEN ;
1.1       anton      64: 
1.8     ! jwilke     65: [THEN]
        !            66: [THEN]