File:  [gforth] / gforth / extend.fs
Revision 1.19: download - view: text, annotated - select for diffs
Sat Jan 4 16:32:28 1997 UTC (22 years, 10 months ago) by anton
Branches: MAIN
CVS tags: HEAD
reformatted errore.fs to single-column format
updated definition of UNUSED
fixed some documentation typos
removed FUZZ

    1: \ EXTEND.FS    CORE-EXT Word not fully tested!         12may93jaw
    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: 
   22: \ May be cross-compiled
   23: 
   24: decimal
   25: 
   26: \ .(                                                    12may93jaw
   27: 
   28: : .(   ( compilation "...<paren>" -- ) \ core-ext dot-paren
   29:     [char] ) parse type ; immediate
   30: 
   31: \ VALUE 2>R 2R> 2R@                                     17may93jaw
   32: 
   33: : value ( w "name" -- ) \ core-ext
   34:   (constant) , ;
   35: \ !! 2value
   36: 
   37: : 2Literal ( compilation w1 w2 -- ; run-time  -- w1 w2 ) \ double two-literal
   38:     swap postpone Literal  postpone Literal ; immediate restrict
   39: 
   40: ' drop alias d>s ( d -- n ) \ double		d_to_s
   41: 
   42: : m*/ ( d1 n2 u3 -- dqout ) \ double m-star-slash
   43:     >r s>d >r abs -rot
   44:     s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
   45:     swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod nip swap
   46:     r> IF dnegate THEN ;
   47: 
   48: \ CASE OF ENDOF ENDCASE                                 17may93jaw
   49: 
   50: \ just as described in dpANS5
   51: 
   52: 0 CONSTANT case ( compilation  -- case-sys ; run-time  -- ) \ core-ext
   53:     immediate
   54: 
   55: : of ( compilation  -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
   56:     \ !! the implementation does not match the stack effect
   57:     1+ >r
   58:     postpone over postpone = postpone if postpone drop
   59:     r> ; immediate
   60: 
   61: : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time  -- ) \ core-ext end-of
   62:     >r postpone else r> ; immediate
   63: 
   64: : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
   65:     postpone drop
   66:     0 ?do postpone then loop ; immediate
   67: 
   68: \ C"                                                    17may93jaw
   69: 
   70: : (c")     "lit ;
   71: 
   72: : CLiteral
   73:     postpone (c") here over char+ allot  place align ; immediate restrict
   74: 
   75: : C" ( compilation "...<quote>" -- ; run-time  -- c-addr ) \ core-ext c-quote
   76:     [char] " parse postpone CLiteral ; immediate restrict
   77: 
   78: \ UNUSED                                                17may93jaw
   79: 
   80: : unused ( -- u ) \ core-ext
   81:     forthstart dup 3 cells + @ + here - ;
   82: 
   83: \ [COMPILE]                                             17may93jaw
   84: 
   85: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
   86:     ' compile, ; immediate
   87: 
   88: \ MARKER                                                17may93jaw
   89: 
   90: \ : marker here last @ create , , DOES> dup @ last ! cell+ @ dp ! ;
   91: \ doesn't work now. vocabularies?
   92: 
   93: \ CONVERT                                               17may93jaw
   94: 
   95: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
   96:     \ obsolescent; superseded by @code{>number}.
   97:     true >number drop ;
   98: 
   99: \ ERASE                                                 17may93jaw
  100: 
  101: : erase ( addr len -- ) \ core-ext
  102:     \ !! dependence on "1 chars 1 ="
  103:     ( 0 1 chars um/mod nip )  0 fill ;
  104: : blank ( addr len -- ) \ string
  105:     bl fill ;
  106: 
  107: \ SEARCH                                                02sep94py
  108: 
  109: : search   ( buf buflen text textlen -- restbuf restlen flag ) \ string
  110:     2over  2 pick - 1+ 3 pick c@ >r
  111:     BEGIN
  112: 	r@ scan dup
  113:     WHILE
  114: 	>r >r  2dup r@ -text
  115: 	0=
  116: 	IF
  117: 	    >r drop 2drop r> r> r> rot + 1- rdrop true
  118: 	    EXIT
  119: 	THEN
  120: 	r> r>  1 /string
  121:     REPEAT
  122:     2drop 2drop  rdrop false ;
  123: 
  124: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT                    11jun93jaw
  125: 
  126: : source-id ( -- 0 | -1 | fileid ) \ core-ext source-i-d
  127:   loadfile @ dup 0= IF  drop sourceline# 0 min  THEN ;
  128: 
  129: : save-input ( -- x1 .. xn n ) \ core-ext
  130:     >in @
  131:     loadfile @
  132:     if
  133: 	loadfile @ file-position throw
  134:     else
  135: 	blk @
  136: 	linestart @
  137:     then
  138:     sourceline#
  139:     >tib @
  140:     source-id
  141:     6 ;
  142: 
  143: : restore-input ( x1 .. xn n -- flag ) \ core-ext
  144:     6 <> -12 and throw
  145:     source-id <> -12 and throw
  146:     >tib !
  147:     >r ( line# )
  148:     loadfile @ 0<>
  149:     if
  150: 	loadfile @ reposition-file throw
  151:     else
  152: 	linestart !
  153: 	blk !
  154: 	sourceline# r@ <> blk @ 0= and loadfile @ 0= and
  155: 	if
  156: 	    drop rdrop true EXIT
  157: 	then
  158:     then
  159:     r> loadline !
  160:     >in !
  161:     false ;
  162: 
  163: \ : save-input ( -- x1 .. xn n ) \ core-ext
  164: \   >in @
  165: \   loadfile @ ?dup
  166: \   IF    dup file-position throw sourceline# >tib @ 6
  167: \         #tib @ >tib +!
  168: \   ELSE  sourceline# blk @ linestart @ >tib @ 5 THEN
  169: \ ;
  170: 
  171: \ : restore-input ( x1 .. xn n -- flag ) \ core-ext
  172: \   swap >tib !
  173: \   6 = IF   loadline ! rot dup loadfile !
  174: \            reposition-file IF drop true EXIT THEN
  175: \       ELSE linestart ! blk !
  176: \            dup sourceline# <> IF 2drop true EXIT THEN
  177: \            loadline !
  178: \       THEN
  179: \   >in ! false ;
  180: 
  181: 
  182: 
  183: \ This things we don't need, but for being complete... jaw
  184: 
  185: \ EXPECT SPAN                                           17may93jaw
  186: 
  187: variable span ( -- a-addr ) \ core-ext
  188: \ obsolescent
  189: 
  190: : expect ( c-addr +len -- ) \ core-ext
  191:     \ obsolescent; use accept
  192:     0 rot over
  193:     BEGIN ( maxlen span c-addr pos1 )
  194: 	key decode ( maxlen span c-addr pos2 flag )
  195: 	>r 2over = r> or
  196:     UNTIL
  197:     2 pick swap /string type
  198:     nip span ! ;
  199: 

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