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Alternative struct0x.fs with context-specific semantics

    1: \ Current object structure
    2: 
    3: \ Copyright (C) 2012 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: \ This file is part of the Forth meta object protocol effort
   21: 
   22: [IFUNDEF] >o
   23:     user op \ object pointer
   24:     : o#+ ( #o -- a ) r> dup cell+ >r @ op @ + ; compile-only
   25:     : >o  ( a -- r:a' )  r> op @ >r >r op ! ; compile-only
   26:     : o>  ( r:a -- )  r> r> op ! >r ; compile-only
   27: [THEN]
   28: 
   29: Variable do-field,
   30: 
   31: : o+ o#+ [ 0 , ] + ;
   32: 
   33: : field-context: ( xt-comp xt-int -- )  Create , , DOES> do-field, ! ;
   34: 
   35: ' lit+ ' +   field-context: default-field
   36: ' o#+  ' o+  field-context: current-field
   37: 
   38: default-field
   39: 
   40: : +field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
   41:     create-interpret/compile over , +
   42: interpretation>
   43:     @ do-field, @ perform
   44: <interpretation
   45: compilation>
   46:     @ do-field, @ cell+ @ compile, ,
   47: <compilation ;
   48: 
   49: : extend-structure ( n "name" -- struct-sys n ) \ Gforth
   50:     \g extend an existing structure
   51:     >r 0 value lastxt >body r> ;
   52: 
   53: : begin-structure ( "name" -- struct-sys 0 ) \ X:structures
   54:     0 extend-structure ;
   55: 
   56: : end-structure ( struct-sys +n -- ) \ X:structures
   57:     swap ! ;
   58: 
   59: : cfield: ( u1 "name" -- u2 ) \ X:structures
   60:     1 +field ;
   61: 
   62: : field: ( u1 "name" -- u2 ) \ X:structures
   63:     aligned cell +field ;
   64: 
   65: : 2field: ( u1 "name" -- u2 ) \ gforth
   66:     aligned 2 cells +field ;
   67: 
   68: : ffield: ( u1 "name" -- u2 ) \ X:structures
   69:     faligned 1 floats +field ;
   70: 
   71: : sffield: ( u1 "name" -- u2 ) \ X:structures
   72:     sfaligned 1 sfloats +field ;
   73: 
   74: : dffield: ( u1 "name" -- u2 ) \ X:structures
   75:     dfaligned 1 dfloats +field ;