File:  [gforth] / gforth / extend.fs
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Sat Dec 31 15:29:25 2011 UTC (7 years, 7 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright years

    1: \ EXTEND.FS    CORE-EXT Word not fully tested!         12may93jaw
    2: 
    3: \ Copyright (C) 1995,1998,2000,2003,2005,2007,2009,2010,2011 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: 
   21: \ May be cross-compiled
   22: 
   23: decimal
   24: 
   25: \ .(                                                    12may93jaw
   26: 
   27: : .(   ( compilation&interpretation "ccc<paren>" -- ) \ core-ext dot-paren
   28:   \G Compilation and interpretation semantics: Parse a string @i{ccc}
   29:   \G delimited by a @code{)} (right parenthesis). Display the
   30:   \G string. This is often used to display progress information during
   31:   \G compilation; see examples below.
   32:   [char] ) parse type ; immediate
   33: 
   34: \ VALUE 2>R 2R> 2R@                                     17may93jaw
   35: 
   36: \ !! 2value
   37: 
   38: [ifundef] 2literal
   39: : 2Literal ( compilation w1 w2 -- ; run-time  -- w1 w2 ) \ double two-literal
   40:     \G Compile appropriate code such that, at run-time, cell pair @i{w1, w2} are
   41:     \G placed on the stack. Interpretation semantics are undefined.
   42:     swap postpone Literal  postpone Literal ; immediate restrict
   43: [then]
   44: 
   45: ' drop alias d>s ( d -- n ) \ double		d_to_s
   46: 
   47: : m*/ ( d1 n2 u3 -- dquot ) \ double m-star-slash
   48:     \G dquot=(d1*n2)/u3, with the intermediate result being triple-precision.
   49:     \G In ANS Forth u3 can only be a positive signed number.
   50:     >r s>d >r abs -rot
   51:     s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
   52:     swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod
   53:     [ 1 -3 mod 0< ] [if]
   54:         -rot r> IF IF 1. d+ THEN dnegate ELSE drop THEN
   55:     [else]
   56:         nip swap r> IF dnegate THEN
   57:     [then] ;
   58: 
   59: \ CASE OF ENDOF ENDCASE                                 17may93jaw
   60: 
   61: \ just as described in dpANS5
   62: 
   63: [ifundef] cs-drop
   64: : CS-DROP ( dest -- ) \ gforth
   65:     dest? 2drop ;
   66: [then]
   67: 
   68: : case ( compilation  -- case-sys ; run-time  -- ) \ core-ext
   69:     postpone begin 0 ; immediate
   70: 
   71: : ?of ( compilation  -- of-sys ; run-time  f -- ) \ gforth
   72:     >r POSTPONE if r> ; immediate
   73: 
   74: : of ( compilation  -- of-sys ; run-time x1 x2 -- |x1 ) \ core-ext
   75:     \ !! the implementation does not match the stack effect
   76:     postpone over postpone = postpone ?of postpone drop ; immediate
   77: 
   78: : endof ( compilation case-sys1 of-sys -- case-sys2 ; run-time  -- ) \ core-ext end-of
   79:     >r postpone else 1 cs-roll r> 1+ ; immediate
   80: 
   81: : contof ( compilation case-sys1 of-sys -- case-sys2 ; run-time  -- )
   82:     \ like @code{endof}, but loops back to the @code{case}
   83:     >r 1 cs-pick postpone again postpone then r> ; immediate
   84: 
   85: : n-thens ( orig1 ... origu u -- )
   86:     0 ?do postpone then loop ;
   87: 
   88: : endcase ( compilation case-sys -- ; run-time x -- ) \ core-ext end-case
   89:     >r cs-drop postpone drop r> n-thens ; immediate
   90: 
   91: : nextcase ( compilation case-sys -- ; run-time x -- ) \ gforth-undocumented
   92:     \ like ENDCASE, but start again from the beginning if this is
   93:     \ reached by fallthrough
   94:     >r postpone drop postpone again r> n-thens ; immediate
   95: 
   96: 
   97: \ C"                                                    17may93jaw
   98: 
   99: : C" ( compilation "ccc<quote>" -- ; run-time  -- c-addr ) \ core-ext c-quote
  100:     \G Compilation: parse a string @i{ccc} delimited by a @code{"}
  101:     \G (double quote). At run-time, return @i{c-addr} which
  102:     \G specifies the counted string @i{ccc}.  Interpretation
  103:     \G semantics are undefined.
  104:     [char] " parse postpone CLiteral ; immediate restrict
  105: 
  106: \ [COMPILE]                                             17may93jaw
  107: 
  108: : [compile] ( compilation "name" -- ; run-time ? -- ? ) \ core-ext bracket-compile
  109:     comp' drop
  110:     dup [ comp' exit drop ] literal = if
  111: 	execute \ EXIT has default compilation semantics, perform them
  112:     else
  113: 	compile,
  114:     then ; immediate
  115: 
  116: \ CONVERT                                               17may93jaw
  117: 
  118: : convert ( ud1 c-addr1 -- ud2 c-addr2 ) \ core-ext-obsolescent
  119:     \G Obsolescent: superseded by @code{>number}.
  120:     char+ true >number drop ;
  121: 
  122: \ ERASE                                                 17may93jaw
  123: 
  124: : erase ( addr u -- ) \ core-ext
  125:     \G Clear all bits in @i{u} aus starting at @i{addr}.
  126:     \ !! dependence on "1 chars 1 ="
  127:     ( 0 1 chars um/mod nip )  0 fill ;
  128: : blank ( c-addr u -- ) \ string
  129:     \G Store the space character into @i{u} chars starting at @i{c-addr}.
  130:     bl fill ;
  131: 
  132: \ SEARCH                                                02sep94py
  133: 
  134: : search ( c-addr1 u1 c-addr2 u2 -- c-addr3 u3 flag ) \ string
  135:     \G Search the string specified by @i{c-addr1, u1} for the string
  136:     \G specified by @i{c-addr2, u2}. If @i{flag} is true: match was found
  137:     \G at @i{c-addr3} with @i{u3} characters remaining. If @i{flag} is false:
  138:     \G no match was found; @i{c-addr3, u3} are equal to @i{c-addr1, u1}.
  139:     \ not very efficient; but if we want efficiency, we'll do it as primitive
  140:     2>r 2dup
  141:     begin
  142: 	dup r@ >=
  143:     while
  144: 	2dup 2r@ string-prefix? if
  145: 	    2swap 2drop 2r> 2drop true exit
  146: 	endif
  147: 	1 /string
  148:     repeat
  149:     2drop 2r> 2drop false ;
  150: 
  151: \ SOURCE-ID SAVE-INPUT RESTORE-INPUT                    11jun93jaw
  152: 
  153: [IFUNDEF] source-id
  154: : source-id ( -- 0 | -1 | fileid ) \ core-ext,file source-i-d
  155:     \G Return 0 (the input source is the user input device), -1 (the
  156:     \G input source is a string being processed by @code{evaluate}) or
  157:     \G a @i{fileid} (the input source is the file specified by
  158:     \G @i{fileid}).
  159:     loadfile @ dup 0= IF  drop sourceline# 0 min  THEN ;
  160: 
  161: : save-input ( -- xn .. x1 n ) \ core-ext
  162:     \G The @i{n} entries @i{xn - x1} describe the current state of the
  163:     \G input source specification, in some platform-dependent way that can
  164:     \G be used by @code{restore-input}.
  165:     >in @
  166:     loadfile @
  167:     if
  168: 	loadfile @ file-position throw
  169: 	[IFDEF] #fill-bytes #fill-bytes @ [ELSE] #tib @ 1+ [THEN] 0 d-
  170:     else
  171: 	blk @
  172: 	linestart @
  173:     then
  174:     sourceline#
  175:     >tib @
  176:     source-id
  177:     6 ;
  178: 
  179: : restore-input ( xn .. x1 n -- flag ) \ core-ext
  180:     \G Attempt to restore the input source specification to the state
  181:     \G described by the @i{n} entries @i{xn - x1}. @i{flag} is
  182:     \G true if the restore fails.  In Gforth it fails pretty often
  183:     \G (and sometimes with a @code{throw}).
  184:     6 <> -12 and throw
  185:     source-id <> -12 and throw
  186:     >tib !
  187:     >r ( line# )
  188:     loadfile @ 0<>
  189:     if
  190: 	loadfile @ reposition-file throw
  191: 	refill 0= -36 and throw \ should never throw
  192:     else
  193: 	linestart !
  194: 	blk !
  195: 	sourceline# r@ <> blk @ 0= and loadfile @ 0= and
  196: 	if
  197: 	    drop rdrop true EXIT
  198: 	then
  199:     then
  200:     r> loadline !
  201:     >in !
  202:     false ;
  203: [THEN]
  204: \ This things we don't need, but for being complete... jaw
  205: 
  206: \ EXPECT SPAN                                           17may93jaw
  207: 
  208: variable span ( -- c-addr ) \ core-ext-obsolescent
  209: \G @code{Variable} -- @i{c-addr} is the address of a cell that stores the
  210: \G length of the last string received by @code{expect}. OBSOLESCENT.
  211: 
  212: : expect ( c-addr +n -- ) \ core-ext-obsolescent
  213:     \G Receive a string of at most @i{+n} characters, and store it
  214:     \G in memory starting at @i{c-addr}. The string is
  215:     \G displayed. Input terminates when the <return> key is pressed or
  216:     \G @i{+n} characters have been received. The normal Gforth line
  217:     \G editing capabilites are available. The length of the string is
  218:     \G stored in @code{span}; it does not include the <return>
  219:     \G character. OBSOLESCENT: superceeded by @code{accept}.
  220:     everyline
  221:     0 rot over
  222:     BEGIN ( maxlen span c-addr pos1 )
  223: 	xkey decode ( maxlen span c-addr pos2 flag )
  224: 	>r 2over = r> or
  225:     UNTIL
  226:     2 pick swap /string type
  227:     nip span ! ;
  228: 
  229: \ marker                                               18dec94py
  230: 
  231: \ Marker creates a mark that is removed (including everything 
  232: \ defined afterwards) when executing the mark.
  233: 
  234: : included-files-mark ( -- u )
  235:     included-files @ ;
  236: 
  237: \ hmm, most of the saving appears to be pretty unnecessary: we could
  238: \ derive the wordlists and the words that have to be kept from the
  239: \ saved value of dp value. - anton
  240: 
  241: : marker, ( -- mark )
  242:     here
  243:     included-files-mark ,
  244:     dup A, \ here
  245:     voclink @ A, \ vocabulary list start
  246:     \ for all wordlists, remember wordlist-id (the linked list)
  247:     voclink
  248:     BEGIN
  249: 	@ dup
  250:     WHILE
  251: 	dup 0 wordlist-link - wordlist-id @ A,
  252:     REPEAT
  253:     drop
  254:     \ remember udp
  255:     udp @ ,
  256:     \ remember dyncode-ptr
  257:     here ['] noop , compile-prim1 finish-code ;
  258: 
  259: : marker! ( mark -- )
  260:     \ reset included files count; resize will happen on next add-included-file
  261:     included-files @ over @ min included-files ! cell+
  262:     \ rest of marker!
  263:     dup @ swap cell+ ( here rest-of-marker )
  264:     dup @ voclink ! cell+
  265:     \ restore wordlists to former words
  266:     voclink
  267:     BEGIN
  268: 	@ dup 
  269:     WHILE
  270: 	over @ over 0 wordlist-link - wordlist-id !
  271: 	swap cell+ swap
  272:     REPEAT
  273:     drop
  274:     \ rehash wordlists to remove forgotten words
  275:     \ why don't we do this in a single step? - anton
  276:     voclink
  277:     BEGIN
  278: 	@ dup
  279:     WHILE
  280: 	dup 0 wordlist-link - rehash
  281:     REPEAT
  282:     drop
  283:     \ restore udp and dp
  284: [IFDEF] forget-dyncode
  285:     dup cell+ @ forget-dyncode drop
  286: [THEN]
  287:     @ udp !  dp !
  288:     \ clean up vocabulary stack
  289:     0 vp @ 0
  290:     ?DO
  291: 	vp cell+ I cells + @ dup here >
  292: 	IF  drop  ELSE  swap 1+  THEN
  293:     LOOP
  294:     dup 0= or set-order \ -1 set-order if order is empty
  295:     get-current here > IF
  296: 	forth-wordlist set-current
  297:     THEN ;
  298: 
  299: : marker ( "<spaces> name" -- ) \ core-ext
  300:     \G Create a definition, @i{name} (called a @i{mark}) whose
  301:     \G execution semantics are to remove itself and everything 
  302:     \G defined after it.
  303:     marker, Create A,
  304: DOES> ( -- )
  305:     @ marker! ;
  306: 

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