File:  [gforth] / gforth / extend.fs
Revision 1.1: download - view: text, annotated - select for diffs
Fri Feb 11 16:30:46 1994 UTC (26 years, 2 months ago) by anton
Branches: MAIN
CVS tags: HEAD
Initial revision

    1: \ EXTEND.FS    CORE-EXT Word not fully tested!         12may93jaw
    2: 
    3: \ May be cross-compiled
    4: 
    5: decimal
    6: 
    7: \ .(                                                    12may93jaw
    8: 
    9: : .(    [char] ) parse type ;
   10: 
   11: \ VALUE 2>R 2R> 2R@                                     17may93jaw
   12: 
   13: : value ( n -- )  (constant) , ;
   14: 
   15: : 2>r   postpone >r postpone >r ; immediate restrict
   16: : 2r>   postpone r> postpone r> ; immediate restrict
   17: : 2r@   postpone 2r> postpone 2dup postpone 2>r ; immediate restrict
   18: 
   19: \ CASE OF ENDOF ENDCASE                                 17may93jaw
   20: 
   21: \ just as described in dpANS5
   22: 
   23: 0 CONSTANT case immediate
   24: 
   25: : of
   26:         1+ >r
   27:         postpone over postpone = postpone if postpone drop
   28:         r> ; immediate
   29: 
   30: : endof
   31:         >r postpone else r> ; immediate
   32: 
   33: : endcase
   34:         postpone drop
   35:         0 ?do postpone then loop ; immediate
   36: 
   37: \ C"                                                    17may93jaw
   38: 
   39: : (c")     "lit ;
   40: 
   41: : CLiteral postpone (c") here over char+ allot  place align ;
   42:                                               immediate restrict
   43: : C"       [char] " parse postpone CLiteral ; immediate restrict
   44: 
   45: \ UNUSED                                                17may93jaw
   46: 
   47: : unused   forthstart dup @ over 2 cells + @ -
   48:            512 -        \ for stack
   49:            + here - ;
   50: 
   51: \ [COMPILE]                                             17may93jaw
   52: 
   53: : [compile] 
   54:  ' compile, ; immediate
   55: 
   56: \ MARKER                                                17may93jaw
   57: 
   58: \ : marker here last @ create , , DOES> dup @ last ! cell+ @ dp ! ;
   59: \ doesn't work now. vocabularies?
   60: 
   61: \ CONVERT                                               17may93jaw
   62: 
   63: : convert true >number drop ;
   64: 
   65: \ ERASE                                                 17may93jaw
   66: 
   67: : erase 0 1 chars um/mod nip 0 fill ;
   68: 
   69: \ ROLL                                                  17may93jaw
   70: 
   71: : roll  dup 1+ pick >r
   72:         cells sp@ 2 cells + dup cell+ rot move drop r> ;
   73: 
   74: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT                    11jun93jaw
   75: 
   76: : source-id ( -- 0 | -1 | fileid )
   77:   loadfile @ dup 0= IF drop linestart @ THEN ;
   78: 
   79: : save-input ( -- x1 .. xn n )
   80:   >in @
   81:   loadfile @ ?dup
   82:   IF    linestart 2@ loadline @ 6
   83:   ELSE  loadline @ blk @ linestart @ 5 THEN
   84:   >tib @ swap ; \ >tib for security
   85: 
   86: : restore-input ( x1 .. xn n -- flag )
   87:   1- swap >tib @ <> IF discard true EXIT THEN
   88:   5 = IF   loadline ! 2dup linestart 2! rot dup loadfile !
   89:            reposition-file IF drop true EXIT THEN
   90:            refill 0= IF drop true EXIT THEN
   91:       ELSE linestart ! blk !
   92:            dup loadline @ <> IF 2drop true EXIT THEN
   93:            loadline !
   94:       THEN
   95:   >in ! false ;
   96: 
   97: 
   98: 
   99: \ This things we don't need, but for being complete... jaw
  100: 
  101: \ EXPECT SPAN                                           17may93jaw
  102: 
  103: variable span
  104: 
  105: : expect ( c-addr +len -- )
  106:   0 rot over
  107:   BEGIN  key decode >r 2over = r> or  UNTIL
  108:   2drop nip span ! ;
  109: 

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