Diff for /gforth/extend.fs between versions 1.10 and 1.43

version 1.10, 1995/07/06 15:57:27 version 1.43, 2000/09/10 19:50:33
Line 1 Line 1
 \ EXTEND.FS    CORE-EXT Word not fully tested!         12may93jaw  \ EXTEND.FS    CORE-EXT Word not fully tested!         12may93jaw
   
   \ Copyright (C) 1995,1998 Free Software Foundation, Inc.
   
   \ This file is part of Gforth.
   
   \ Gforth is free software; you can redistribute it and/or
   \ modify it under the terms of the GNU General Public License
   \ as published by the Free Software Foundation; either version 2
   \ of the License, or (at your option) any later version.
   
   \ This program is distributed in the hope that it will be useful,
   \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   \ GNU General Public License for more details.
   
   \ You should have received a copy of the GNU General Public License
   \ along with this program; if not, write to the Free Software
   \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   
   
 \ May be cross-compiled  \ May be cross-compiled
   
 decimal  decimal
   
 \ .(                                                    12may93jaw  \ .(                                                    12may93jaw
   
 : .(   ( -- )  : .(   ( compilation,interpretation "ccc<paren>" -- ) \ core-ext dot-paren
     [char] ) parse type ; immediate    \G Compilation and interpretation semantics: Parse a string @i{ccc}
     \G delimited by a @code{)} (right parenthesis). Display the
     \G string. This is often used to display progress information during
     \G compilation; see examples below.
     [char] ) parse type ; immediate
   
 \ VALUE 2>R 2R> 2R@                                     17may93jaw  \ VALUE 2>R 2R> 2R@                                     17may93jaw
   
 : value ( n -- )  
   (constant) , ;  
 \ !! 2value  \ !! 2value
   
 : 2Literal  swap postpone Literal  postpone Literal ;  : 2Literal ( compilation w1 w2 -- ; run-time  -- w1 w2 ) \ double two-literal
   immediate restrict      \G Compile appropriate code such that, at run-time, cell pair @i{w1, w2} are
       \G placed on the stack. Interpretation semantics are undefined.
 : m*/    ( d1 n2 u3 -- dqout )    >r s>d >r abs -rot      swap postpone Literal  postpone Literal ; immediate restrict
   s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*  
   swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod nip swap  ' drop alias d>s ( d -- n ) \ double            d_to_s
   r> IF dnegate THEN ;  
   : m*/ ( d1 n2 u3 -- dquot ) \ double m-star-slash
       \G dquot=(d1*n2)/u3, with the intermediate result being triple-precision.
       \G In ANS Forth u3 can only be a positive signed number.
       >r s>d >r abs -rot
       s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
       swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod nip swap
       r> IF dnegate THEN ;
   
 \ CASE OF ENDOF ENDCASE                                 17may93jaw  \ CASE OF ENDOF ENDCASE                                 17may93jaw
   
 \ just as described in dpANS5  \ just as described in dpANS5
   
 0 CONSTANT case immediate  0 CONSTANT case ( compilation  -- case-sys ; run-time  -- ) \ core-ext
       immediate
   
 : of  : of ( compilation  -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
         1+ >r      \ !! the implementation does not match the stack effect
         postpone over postpone = postpone if postpone drop      1+ >r
         r> ; immediate      postpone over postpone = postpone if postpone drop
       r> ; immediate
 : endof  
         >r postpone else r> ; immediate  : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time  -- ) \ core-ext end-of
       >r postpone else r> ; immediate
 : endcase  
         postpone drop  : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
         0 ?do postpone then loop ; immediate      postpone drop
       0 ?do postpone then loop ; immediate
   
 \ C"                                                    17may93jaw  \ C"                                                    17may93jaw
   
 : (c")     "lit ;  : (c")     "lit ;
   
 : CLiteral postpone (c") here over char+ allot  place align ;  : CLiteral
                                               immediate restrict      postpone (c") here over char+ allot  place align ; immediate restrict
 : C"       [char] " parse postpone CLiteral ; immediate restrict  
   
 \ UNUSED                                                17may93jaw  
   
 : unused   s0 @ 512 -        \ for stack  : C" ( compilation "ccc<quote>" -- ; run-time  -- c-addr ) \ core-ext c-quote
            here - ;      \G Compilation: parse a string @i{ccc} delimited by a @code{"}
       \G (double quote). At run-time, return @i{c-addr} which
       \G specifies the counted string @i{ccc}.  Interpretation
       \G semantics are undefined.
       [char] " parse postpone CLiteral ; immediate restrict
   
 \ [COMPILE]                                             17may93jaw  \ [COMPILE]                                             17may93jaw
   
 : [compile]   : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
  ' compile, ; immediate      comp' drop
       dup [ comp' exit drop ] literal = if
 \ MARKER                                                17may93jaw          execute \ EXIT has default compilation semantics, perform them
       else
 \ : marker here last @ create , , DOES> dup @ last ! cell+ @ dp ! ;          compile,
 \ doesn't work now. vocabularies?      then ; immediate
   
 \ CONVERT                                               17may93jaw  \ CONVERT                                               17may93jaw
   
 : convert true >number drop ;  : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext
       \G OBSOLESCENT: superseded by @code{>number}.
       char+ true >number drop ;
   
 \ ERASE                                                 17may93jaw  \ ERASE                                                 17may93jaw
   
 : erase ( addr len -- )  ( 0 1 chars um/mod nip )  0 fill ;  : erase ( addr u -- ) \ core-ext
 : blank ( addr len -- )  ( 0 1 chars um/mod nip ) bl fill ;      \G Clear all bits in @i{u} aus starting at @i{addr}.
       \ !! dependence on "1 chars 1 ="
       ( 0 1 chars um/mod nip )  0 fill ;
   : blank ( c-addr u -- ) \ string
       \G Store the space character into @i{u} chars starting at @i{c-addr}.
       bl fill ;
   
 \ SEARCH                                                02sep94py  \ SEARCH                                                02sep94py
   
 : search   ( buf buflen text textlen -- restbuf restlen flag )  : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
   2over  2 pick - 1+ 3 pick c@ >r      \G Search the string specified by @i{c-addr1, u1} for the string
   BEGIN  r@ scan dup  WHILE      \G specified by @i{c-addr2, u2}. If @i{flag} is true: match was found
          >r >r  2dup r@ -text      \G at @i{c-addr3} with @i{u3} characters remaining. If @i{flag} is false:
          0= IF  >r drop 2drop r> r> r> rot + 1- rdrop true  EXIT  THEN      \G no match was found; @i{c-addr3, u3} are equal to @i{c-addr1, u1}.
          r> r>  1 /string   REPEAT      \ not very efficient; but if we want efficiency, we'll do it as primitive
   2drop 2drop  rdrop false ;      2>r 2dup
       begin
 \ ROLL                                                  17may93jaw          dup r@ >=
       while
 : roll  ( x0 x1 .. xn n -- x1 .. xn x0 )           over 2r@ swap -text 0= if
   dup 1+ pick >r              2swap 2drop 2r> 2drop true exit
   cells sp@ cell+ dup cell+ rot move drop r> ;          endif
           1 /string
       repeat
       2drop 2r> 2drop false ;
   
 \ SOURCE-ID SAVE-INPUT RESTORE-INPUT                    11jun93jaw  \ SOURCE-ID SAVE-INPUT RESTORE-INPUT                    11jun93jaw
   
 : source-id ( -- 0 | -1 | fileid )  : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
   loadfile @ dup 0= IF  drop loadline @ 0 min  THEN ;      \G Return 0 (the input source is the user input device), -1 (the
       \G input source is a string being processed by @code{evaluate}) or
 : save-input ( -- x1 .. xn n )      \G a @i{fileid} (the input source is the file specified by
   >in @      \G @i{fileid}).
   loadfile @ ?dup      loadfile @ dup 0= IF  drop sourceline# 0 min  THEN ;
   IF    dup file-position throw loadline @ >tib @ 6  
         #tib @ >tib +!  : save-input ( -- xn .. x1 n ) \ core-ext
   ELSE  loadline @ blk @ linestart @ >tib @ 5 THEN      \G The @i{n} entries @i{xn - x1} describe the current state of the
 ;      \G input source specification, in some platform-dependent way that can
       \G be used by @code{restore-input}.
 : restore-input ( x1 .. xn n -- flag )      >in @
   swap >tib !      loadfile @
   6 = IF   loadline ! rot dup loadfile !      if
            reposition-file IF drop true EXIT THEN          loadfile @ file-position throw
       ELSE linestart ! blk !          [IFDEF] #fill-bytes #fill-bytes @ [ELSE] #tib @ 1+ [THEN] 0 d-
            dup loadline @ <> IF 2drop true EXIT THEN      else
            loadline !          blk @
       THEN          linestart @
   >in ! false ;      then
       sourceline#
       >tib @
       source-id
       6 ;
   
   : restore-input ( xn .. x1 n -- flag ) \ core-ext
       \G Attempt to restore the input source specification to the state
       \G described by the @i{n} entries @i{xn - x1}. @i{flag} is
       \G true if the restore fails.  In Gforth it fails pretty often
       \G (and sometimes with a @code{throw}).
       6 <> -12 and throw
       source-id <> -12 and throw
       >tib !
       >r ( line# )
       loadfile @ 0<>
       if
           loadfile @ reposition-file throw
           refill 0= -36 and throw \ should never throw
       else
           linestart !
           blk !
           sourceline# r@ <> blk @ 0= and loadfile @ 0= and
           if
               drop rdrop true EXIT
           then
       then
       r> loadline !
       >in !
       false ;
   
 \ This things we don't need, but for being complete... jaw  \ This things we don't need, but for being complete... jaw
   
 \ EXPECT SPAN                                           17may93jaw  \ EXPECT SPAN                                           17may93jaw
   
 variable span  variable span ( -- c-addr ) \ core-ext
   \G @code{Variable} -- @i{c-addr} is the address of a cell that stores the
 : expect ( c-addr +len -- )  \G length of the last string received by @code{expect}. OBSOLESCENT.
   
   : expect ( c-addr +n -- ) \ core-ext
       \G Receive a string of at most @i{+n} characters, and store it
       \G in memory starting at @i{c-addr}. The string is
       \G displayed. Input terminates when the <return> key is pressed or
       \G @i{+n} characters have been received. The normal Gforth line
       \G editing capabilites are available. The length of the string is
       \G stored in @code{span}; it does not include the <return>
       \G character. OBSOLESCENT: superceeded by @code{accept}.
     0 rot over      0 rot over
     BEGIN ( maxlen span c-addr pos1 )      BEGIN ( maxlen span c-addr pos1 )
         key decode ( maxlen span c-addr pos2 flag )          key decode ( maxlen span c-addr pos2 flag )
         >r 2over = r> or          >r 2over = r> or
     UNTIL      UNTIL
     type-rest drop      2 pick swap /string type
     2drop nip span ! ;      nip span ! ;
   
   \ marker                                               18dec94py
   
   \ Marker creates a mark that is removed (including everything 
   \ defined afterwards) when executing the mark.
   
   : included-files-mark ( -- u )
       included-files 2@ nip
       blk @ 0=
       if \ not input from blocks
           source-id 1 -1 within
           if \ input from file
               1- \ do not include the last file (hopefully this is the
                  \ currently included file)
           then
       then ;  
   
   \ hmm, most of the saving appears to be pretty unnecessary: we could
   \ derive the wordlists and the words that have to be kept from the
   \ saved value of dp value. - anton
   
   : marker, ( -- mark )
       here
       included-files-mark ,
       dup A, \ here
       voclink @ A, \ vocabulary list start
       \ for all wordlists, remember wordlist-id (the linked list)
       voclink
       BEGIN
           @ dup
       WHILE
           dup 0 wordlist-link - wordlist-id @ A,
       REPEAT
       drop
       \ remember udp
       udp @ , ;
   
   : marker! ( mark -- )
       \ reset included files count; resize will happen on next add-included-file
       included-files 2@ drop over @ included-files 2! cell+
       \ rest of marker!
       dup @ swap cell+ ( here rest-of-marker )
       dup @ voclink ! cell+
       \ restore wordlists to former words
       voclink
       BEGIN
           @ dup 
       WHILE
           over @ over 0 wordlist-link - wordlist-id !
           swap cell+ swap
       REPEAT
       drop
       \ rehash wordlists to remove forgotten words
       \ why don't we do this in a single step? - anton
       voclink
       BEGIN
           @ dup
       WHILE
           dup 0 wordlist-link - rehash
       REPEAT
       drop
       \ restore udp and dp
       @ udp !  dp !
       \ clean up vocabulary stack
       0 vp @ 0
       ?DO
           vp cell+ I cells + @ dup here >
           IF  drop  ELSE  swap 1+  THEN
       LOOP
       dup 0= or set-order \ -1 set-order if order is empty
       get-current here > IF
           forth-wordlist set-current
       THEN ;
   
   : marker ( "<spaces> name" -- ) \ core-ext
       \G Create a definition, @i{name} (called a @i{mark}) whose
       \G execution semantics are to remove itself and everything 
       \G defined after it.
       marker, Create A,
   DOES> ( -- )
       @ marker! ;
   

Removed from v.1.10  
changed lines
  Added in v.1.43


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