context-struct.fs

\ Current object structure

\ Author: Bernd Paysan
\ Copyright (C) 2012,2019 Free Software Foundation, Inc.

\ This file is part of Gforth.

\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.

\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
\ GNU General Public License for more details.

\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see http://www.gnu.org/licenses/.

\ This file is part of the Forth meta object protocol effort

[IFUNDEF] >o
    user op \ object pointer
    : o#+ ( #o -- a ) r> dup cell+ >r @ op @ + ; compile-only
    : >o  ( a -- r:a' )  r> op @ >r >r op ! ; compile-only
    : o>  ( r:a -- )  r> r> op ! >r ; compile-only
[THEN]

Variable do-field,

: o+ o#+ [ 0 , ] + ;

: field-context: ( xt-comp xt-int -- )  Create , , DOES> do-field, ! ;

' lit+ ' +   field-context: default-field
' o#+  ' o+  field-context: current-field

default-field

: context+field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
    create-interpret/compile over , +
interpretation>
    @ do-field, @ perform
<interpretation
compilation>
    @ do-field, @ cell+ @ compile, ,
<compilation ;

: context:field  ['] context+field IS +field ;