File:  [gforth] / gforth / struct0x.fs
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Mon Dec 31 15:25:18 2012 UTC (6 years, 9 months ago) by anton
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CVS tags: HEAD
updated copyright year

    1: \ implementation of Forth 200x structures
    2: 
    3: \ Copyright (C) 2007,2012 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: : standard+field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
   21:     over if
   22:         (field) over ,
   23:     else
   24:         create dozerofield
   25:     then
   26:     + ;
   27: 
   28: Defer +field
   29: \ A number of things have field-like structure, but not
   30: \ exactly field-like behavior.  Objects, locals, etc.
   31: \ Allow them to plug into +field.
   32: 
   33: : standard:field ( -- )
   34:     \g set +field to standard behavior
   35:     ['] standard+field IS +field ;
   36: 
   37: standard:field
   38: 
   39: : extend-structure ( n "name" -- struct-sys n ) \ Gforth
   40:     \g extend an existing structure
   41:     standard:field >r 0 value lastxt >body r> ;
   42: 
   43: : begin-structure ( "name" -- struct-sys 0 ) \ X:structures
   44:     0 extend-structure ;
   45: 
   46: : end-structure ( struct-sys +n -- ) \ X:structures
   47:     swap ! ;
   48: 
   49: : cfield: ( u1 "name" -- u2 ) \ X:structures
   50:     1 +field ;
   51: 
   52: : field: ( u1 "name" -- u2 ) \ X:structures
   53:     aligned cell +field ;
   54: 
   55: : 2field: ( u1 "name" -- u2 ) \ gforth
   56:     aligned 2 cells +field ;
   57: 
   58: : ffield: ( u1 "name" -- u2 ) \ X:structures
   59:     faligned 1 floats +field ;
   60: 
   61: : sffield: ( u1 "name" -- u2 ) \ X:structures
   62:     sfaligned 1 sfloats +field ;
   63: 
   64: : dffield: ( u1 "name" -- u2 ) \ X:structures
   65:     dfaligned 1 dfloats +field ;

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