1 /* Native functions for introspection operations. 2 3 Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3 of the License, or (at your option) any later 8 version. 9 10 This program is distributed in the hope that it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 13 details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "types.h" 20 #include "exceptions.h" 21 #include "ops.h" 22 #include "progconsts.h" 23 #include "progops.h" 24 #include "progtypes.h" 25 #include "main.h" 26 27 /* Introspection. */ 28 29 __attr __fn_native_introspection_object_getattr(__attr __args[]) 30 { 31 __attr * const obj = &__args[1]; 32 __attr * const name = &__args[2]; 33 __attr * const _default = &__args[3]; 34 /* name.__data__ interpreted as string */ 35 __attr key = __load_via_object(name->value, __pos___key__); 36 37 if ((key.code == 0) && (key.pos == 0)) 38 return *_default; 39 else 40 return __check_and_load_via_any(obj->value, key.pos, key.code); 41 } 42 43 static int __issubclass(__ref obj, __attr cls) 44 { 45 return (__HASATTR(obj, __TYPEPOS(cls.value), __TYPECODE(cls.value))); 46 } 47 48 __attr __fn_native_introspection_isinstance(__attr __args[]) 49 { 50 __attr * const obj = &__args[1]; 51 __attr * const cls = &__args[2]; 52 53 /* cls must be a class. */ 54 if (__is_instance(obj->value) && __issubclass(__get_class(obj->value), *cls)) 55 return __builtins___boolean_True; 56 else 57 return __builtins___boolean_False; 58 } 59 60 __attr __fn_native_introspection_issubclass(__attr __args[]) 61 { 62 __attr * const obj = &__args[1]; 63 __attr * const cls = &__args[2]; 64 65 /* obj and cls must be classes. */ 66 if (__issubclass(obj->value, *cls)) 67 return __builtins___boolean_True; 68 else 69 return __builtins___boolean_False; 70 } 71 72 /* Module initialisation. */ 73 74 void __main_native_introspection() 75 { 76 }