File:  [gforth] / gforth / Attic / interpretation.fs
Revision 1.1: download - view: text, annotated - select for diffs
Mon May 6 12:39:00 1996 UTC (26 years, 2 months ago) by anton
Branches: MAIN
CVS tags: HEAD
added tables (case-sensitive wordlists)
cleaned up hash.fs a bit
added "interpretation:" for adding special interpretation semantics

    1: \ Interpretation semantics
    2: 
    3: \ Copyright (C) 1996 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: \ This file defines a mechanism for specifying special interpretation
   23: \ semantics as well as the interpretation semantics of several words.
   24: 
   25: table constant interpretation-semantics
   26: 
   27: :noname ( c-addr u word-ident -- )
   28:     \ word-ident is currently an xt, but it might be the nfa
   29:     sp@ cell interpretation-semantics search-wordlist
   30:     if ( c-addr u word-ident xt )
   31: 	nip nip nip execute
   32:     else
   33: 	defers interpret-special
   34:     endif ;
   35: IS interpret-special
   36: 
   37: : interpretation: ( -- colon-sys ) \ gforth
   38:     \G make the last word one with special interpretation semantics and
   39:     \G start the (colon) definition of these semantics.
   40:     \ !! fix reveal such that it is not necessary to do it before the
   41:     \    set-current
   42:     restrict
   43:     lastcfa cell nextname \ !! use nfa instead of cfa
   44:     get-current >r
   45:     interpretation-semantics set-current : reveal
   46:     r> set-current ;
   47: 
   48: \ : foo
   49: \     ." compilation semantics" ; immediate
   50: \ interpretation:
   51: \     ." interpretation semantics" ;
   52: 
   53: \ foo			\ interpretation semantics ok
   54: \ : xxx foo ;		\ compilation semantics ok
   55: \ : yyy postpone foo ;	\ ok
   56: \ yyy			\ compilation semantics ok

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