File:  [gforth] / gforth / kernel / quotes.fs
Revision 1.11: download - view: text, annotated - select for diffs
Mon Aug 25 14:17:54 2003 UTC (20 years, 7 months ago) by anton
Branches: MAIN
CVS tags: v0-6-2, HEAD
documentation updates
fixed some portability bugs in vmgen-ex and vmgen-ex2
updated copyright years

    1: \ quote: S" and ." words
    2: 
    3: \ Copyright (C) 1996,1998,1999,2002,2003 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \ this file comes last, because these words override cross' words.
   22: 
   23: require ./vars.fs
   24: 
   25: : CLiteral ( Compilation c-addr1 u ; run-time -- c-addr )
   26:     2>r postpone ahead here 2r> s, >r postpone then
   27:     r> postpone literal ; immediate restrict
   28: 
   29: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
   30: \G Compilation: compile the string specified by @i{c-addr1},
   31: \G @i{u} into the current definition. Run-time: return
   32: \G @i{c-addr2 u} describing the address and length of the
   33: \G string.
   34:     tuck 2>r postpone ahead here 2r> chars mem, align >r postpone then
   35:     r> postpone literal postpone literal ; immediate restrict
   36: 
   37: \ \ abort"							22feb93py
   38: 
   39: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext	abort-quote
   40: \G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw},
   41: \G displaying the string @i{ccc} if there is no exception frame on the
   42: \G exception stack.
   43:     postpone if [char] " parse postpone cliteral postpone c(abort")
   44:     postpone then ; immediate restrict
   45: 
   46: \ create s"-buffer /line chars allot
   47: has? compiler 0= 
   48: [IF] : s" [ELSE] :noname [THEN]
   49: 	[char] " parse
   50: [ has? OS [IF] ]
   51:     save-mem
   52: [ [THEN] ]
   53: ;
   54: \    	/line min >r s"-buffer r@ cmove
   55: \    	s"-buffer r> ;
   56: has? compiler [IF]
   57: :noname [char] " parse postpone SLiteral ;
   58: interpret/compile: S" ( compilation 'ccc"' -- ; run-time -- c-addr u )	\ core,file	s-quote
   59:   \G Compilation: Parse a string @i{ccc} delimited by a @code{"}
   60:   \G (double quote). At run-time, return the length, @i{u}, and the
   61:   \G start address, @i{c-addr} of the string. Interpretation: parse
   62:   \G the string as before, and return @i{c-addr}, @i{u}. Gforth
   63:   \G @code{allocate}s the string. The resulting memory leak is usually
   64:   \G not a problem; the exception is if you create strings containing
   65:   \G @code{S"} and @code{evaluate} them; then the leak is not bounded
   66:   \G by the size of the interpreted files and you may want to
   67:   \G @code{free} the strings.  ANS Forth only guarantees one buffer of
   68:   \G 80 characters, so in standard programs you should assume that the
   69:   \G string lives only until the next @code{s"}.
   70: [THEN]
   71: 
   72: :noname    [char] " parse type ;
   73: :noname    [char] " parse postpone sLiteral postpone type ;
   74: interpret/compile: ." ( compilation 'ccc"' -- ; run-time -- )  \ core	dot-quote
   75:   \G Compilation: Parse a string @i{ccc} delimited by a " (double
   76:   \G quote). At run-time, display the string. Interpretation semantics
   77:   \G for this word are undefined in ANS Forth. Gforth's interpretation
   78:   \G semantics are to display the string. This is the simplest way to
   79:   \G display a string from within a definition; see examples below.
   80: 

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