swfdec/swfdec_as_super.c

   1 /* Swfdec
   2  * Copyright (C) 2007 Benjamin Otte <otte@gnome.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <math.h>
  25
  26 #include "swfdec_as_super.h"
  27 #include "swfdec_as_context.h"
  28 #include "swfdec_as_frame_internal.h"
  29 #include "swfdec_as_function.h"
  30 #include "swfdec_as_internal.h"
  31 #include "swfdec_as_strings.h"
  32 #include "swfdec_debug.h"
  33 #include "swfdec_movie.h"
  34
  35 G_DEFINE_TYPE (SwfdecAsSuper, swfdec_as_super, SWFDEC_TYPE_AS_FUNCTION)
  36
  37 static void
  38 swfdec_as_super_call (SwfdecAsFunction *function, SwfdecAsObject *thisp,
  39     gboolean construct, SwfdecAsObject *super_reference, guint n_args,
  40     const SwfdecAsValue *args, SwfdecAsValue *return_value)
  41 {
  42   SwfdecAsSuper *super = SWFDEC_AS_SUPER (function);
  43   SwfdecAsFunction *fun;
  44   SwfdecAsValue val;
  45
  46   if (super->object == NULL) {
  47     SWFDEC_WARNING ("super () called without an object.");
  48     return;
  49   }
  50
  51   swfdec_as_object_get_variable (super->object, SWFDEC_AS_STR___constructor__, &val);
  52   if (!SWFDEC_AS_VALUE_IS_OBJECT (val) ||
  53       !SWFDEC_IS_AS_FUNCTION (fun = (SwfdecAsFunction *) (SWFDEC_AS_VALUE_GET_OBJECT (val)->relay)))
  54     return;
  55
  56   if (construct) {
  57     SWFDEC_FIXME ("What happens with \"new super()\"?");
  58   }
  59   swfdec_as_function_call_full (fun, super->thisp, construct ||
  60       swfdec_as_context_is_constructing (swfdec_gc_object_get_context (super)),
  61       super->object->prototype, n_args, args, return_value);
  62 }
  63
  64 static void
  65 swfdec_as_super_class_init (SwfdecAsSuperClass *klass)
  66 {
  67   SwfdecAsFunctionClass *function_class = SWFDEC_AS_FUNCTION_CLASS (klass);
  68
  69   function_class->call = swfdec_as_super_call;
  70 }
  71
  72 static void
  73 swfdec_as_super_init (SwfdecAsSuper *super)
  74 {
  75 }
  76
  77 void
  78 swfdec_as_super_new (SwfdecAsFrame *frame, SwfdecAsObject *thisp, SwfdecAsObject *ref)
  79 {
  80   SwfdecAsContext *context;
  81   SwfdecAsObject *object;
  82   SwfdecAsSuper *super;
  83
  84   g_return_if_fail (frame != NULL);
  85   g_return_if_fail (thisp != NULL);
  86
  87   if (frame->super != NULL)
  88     return;
  89   context = thisp->context;
  90   if (context->version <= 5)
  91     return;
  92
  93   super = g_object_new (SWFDEC_TYPE_AS_SUPER, "context", context, NULL);
  94   frame->super = super;
  95   super->thisp = swfdec_as_object_resolve (thisp);
  96   if (context->version <= 5) {
  97     super->object = NULL;
  98   } else {
  99     super->object = ref;
 100   }
 101
 102   object = swfdec_as_object_new_empty (context);
 103   object->super = TRUE;
 104   swfdec_as_object_set_relay (object, SWFDEC_AS_RELAY (super));
 105 }
 106
 107 SwfdecAsObject *
 108 swfdec_as_super_resolve_property (SwfdecAsSuper *super, const char *name)
 109 {
 110   SwfdecAsObject *ref;
 111   SwfdecAsContext *context;
 112
 113   g_return_val_if_fail (SWFDEC_IS_AS_SUPER (super), NULL);
 114
 115   if (super->object == NULL)
 116     return NULL;
 117   ref = super->object->prototype;
 118   if (ref == NULL)
 119     return NULL;
 120   context = swfdec_gc_object_get_context (super);
 121   if (name && context->version > 6) {
 122     /* skip prototypes to find the next one that has this function defined */
 123     SwfdecAsObject *res;
 124     if (swfdec_as_object_get_variable_and_flags (ref,
 125          name, NULL, NULL, &res) && ref != res) {
 126       while (ref->prototype != res) {
 127         ref = ref->prototype;
 128         g_assert (ref);
 129       }
 130     }
 131   }
 132   return ref;
 133 }
 134