File:  [gforth] / gforth / kernel / Attic / special.fs
Revision 1.12: download - view: text, annotated - select for diffs
Mon May 17 15:07:05 1999 UTC (23 years, 6 months ago) by jwilke
Branches: MAIN
CVS tags: HEAD
Added require at beginning of file.

    1: \ words with non-default and non-immediate compilation semantics
    2: 
    3: \ Copyright (C) 1996,1998 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: \ this file comes last, because these words override cross' words.
   22: 
   23: require ./vars.fs
   24: 
   25: create s"-buffer /line chars allot
   26: has? compiler 0= 
   27: [IF] : s" [ELSE] :noname [THEN]
   28: 	[char] " parse
   29:     	/line min >r s"-buffer r@ cmove
   30:     	s"-buffer r> ;
   31: has? compiler [IF]
   32: :noname [char] " parse postpone SLiteral ;
   33: interpret/compile: S" ( compilation 'ccc"' -- ; run-time -- c-addr u )	\ core,file	s-quote
   34:   \G Compilation: Parse a string @i{ccc} delimited by a @code{"}
   35:   \G (double quote). At run-time, return the length, @i{u}, and the
   36:   \G start address, @i{c-addr} of the string. Interpretation: parse
   37:   \G the string as before, and return @i{c-addr}, @i{u}. The
   38:   \G string is stored in a temporary buffer which may be overwritten
   39:   \G by subsequent uses of @code{S"}.
   40: [THEN]
   41: 
   42: has? compiler [IF]
   43: : [IS] ( compilation "name" -- ; run-time xt -- ) \ possibly-gforth bracket-is
   44:     ' >body postpone ALiteral postpone ! ; immediate restrict
   45: 
   46: :noname    ' >body ! ;
   47: ' [IS]
   48: interpret/compile: IS ( xt "name" -- ) \ gforth
   49: 
   50: :noname    ' >body @ ;
   51: :noname    ' >body postpone ALiteral postpone @ ;
   52: interpret/compile: What's ( "name" -- addr ) \ gforth
   53: 
   54: :noname    [char] " parse type ;
   55: :noname    postpone (.") ,"  align ;
   56: interpret/compile: ." ( compilation 'ccc"' -- ; run-time -- )  \ core	dot-quote
   57:   \G Compilation: Parse a string @i{ccc} delimited by a " (double
   58:   \G quote). At run-time, display the string. Interpretation semantics
   59:   \G for this word are undefined in ANS Forth. Gforth's interpretation
   60:   \G semantics are to display the string. This is the simplest way to
   61:   \G display a string from within a definition; see examples below.
   62: 
   63: \ DOES>                                                17mar93py
   64: 
   65: :noname
   66:     dodoes, here !does ]
   67:     defstart :-hook ;
   68: :noname
   69:     ;-hook ?struc 
   70:     [ has? xconds [IF] ] exit-like [ [THEN] ]
   71:     postpone (does>) dodoes,
   72:     defstart :-hook ;
   73: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core	does
   74:     
   75: ' IS Alias TO ( w "name" -- ) \ core-ext
   76: immediate
   77: 
   78: [THEN]
   79: 
   80: has? compiler [IF]
   81: : interpret/compile? ( xt -- flag )
   82:     >does-code ['] S" >does-code = ;
   83: [ELSE]
   84: : interpret/compile?
   85:     false ;
   86: [THEN]
   87: 

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