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Annotation of gforth/interpretation.fs, revision 1.1

1.1     ! anton       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