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Annotation of gforth/struct0x.fs, revision 1.5

1.1       anton       1: \ implementation of Forth 200x structures
                      2: 
1.5     ! anton       3: \ Copyright (C) 2007,2012 Free Software Foundation, Inc.
1.1       anton       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
1.2       anton       9: \ as published by the Free Software Foundation, either version 3
1.1       anton      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
1.2       anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.1       anton      19: 
1.4       pazsan     20: : standard+field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
1.1       anton      21:     over if
                     22:         (field) over ,
                     23:     else
                     24:         create dozerofield
                     25:     then
                     26:     + ;
                     27: 
1.4       pazsan     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: 
1.3       pazsan     39: : extend-structure ( n "name" -- struct-sys n ) \ Gforth
                     40:     \g extend an existing structure
1.4       pazsan     41:     standard:field >r 0 value lastxt >body r> ;
1.3       pazsan     42: 
1.1       anton      43: : begin-structure ( "name" -- struct-sys 0 ) \ X:structures
1.3       pazsan     44:     0 extend-structure ;
1.1       anton      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 ;