File:  [gforth] / gforth / look.fs
Revision 1.1: download - view: text, annotated - select for diffs
Fri Feb 11 16:30:46 1994 UTC (26 years ago) by anton
Branches: MAIN
CVS tags: HEAD
Initial revision

    1: \ LOOK.FS      xt -> lfa                               22may93jaw
    2: 
    3: \ Look checks first if the word is a primitive. If yes then the
    4: \ vocabulary in the primitive area is beeing searched, meaning
    5: \ creating for each word a xt and comparing it...
    6: 
    7: \ If a word is no primitive look searches backwards to find the nfa.
    8: \ Problems: A compiled xt via compile, might be created with noname:
    9: \           a noname: leaves now a empty name field
   10: 
   11: decimal
   12: 
   13: \ >NAME PRIMSTART                                       22may93jaw
   14: 
   15: \ : >name ( xt -- nfa )
   16: \         BEGIN   1 chars -
   17: \                 dup c@ 128 and
   18: \         UNTIL ;
   19: 
   20: : PrimStart ['] true >name ;
   21: 
   22: \ look                                                  17may93jaw
   23: 
   24: : (look)  ( xt startlfa -- lfa flag )
   25:         false swap
   26:         BEGIN @ dup
   27:         WHILE dup cell+ name>
   28:               3 pick = IF nip dup THEN
   29:         REPEAT
   30:         drop nip
   31:         dup 0<> ;
   32: 
   33: : look ( cfa -- lfa flag )
   34:         dup forthstart u<
   35:         IF PrimStart (look)
   36:         ELSE >name true THEN ;
   37: 

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