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)))
  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 gboolean
  65 swfdec_as_super_get (SwfdecAsObject *object, SwfdecAsObject *orig,
  66     const char *variable, SwfdecAsValue *val, guint *flags)
  67 {
  68   SwfdecAsSuper *super = SWFDEC_AS_SUPER (object);
  69   SwfdecAsObjectClass *klass;
  70   SwfdecAsObject *cur;
  71   guint i;
  72
  73   if (super->object == NULL) {
  74     SWFDEC_WARNING ("super.%s () called without an object.", variable);
  75     return FALSE;
  76   }
  77   cur = super->object->prototype;
  78   for (i = 0; i <= SWFDEC_AS_OBJECT_PROTOTYPE_RECURSION_LIMIT && cur != NULL; i++) {
  79     klass = SWFDEC_AS_OBJECT_GET_CLASS (cur);
  80     /* FIXME: is the orig pointer correct? */
  81     if (klass->get (cur, super->object, variable, val, flags))
  82       return TRUE;
  83     /* FIXME: need get_prototype_internal here? */
  84     cur = swfdec_as_object_get_prototype (cur);
  85   }
  86   if (i > SWFDEC_AS_OBJECT_PROTOTYPE_RECURSION_LIMIT) {
  87     swfdec_as_context_abort (swfdec_gc_object_get_context (object),
  88         "Prototype recursion limit exceeded");
  89   }
  90   SWFDEC_AS_VALUE_SET_UNDEFINED (val);
  91   *flags = 0;
  92   return FALSE;
  93 }
  94
  95 static void
  96 swfdec_as_super_set (SwfdecAsObject *object, const char *variable, const SwfdecAsValue *val, guint flags)
  97 {
  98   /* This seems to be ignored completely */
  99 }
 100
 101 static void
 102 swfdec_as_super_set_flags (SwfdecAsObject *object, const char *variable, guint flags, guint mask)
 103 {
 104   /* if we have no variables, we also can't set its flags... */
 105 }
 106
 107 static SwfdecAsDeleteReturn
 108 swfdec_as_super_delete (SwfdecAsObject *object, const char *variable)
 109 {
 110   /* if we have no variables... */
 111   return SWFDEC_AS_DELETE_NOT_FOUND;
 112 }
 113
 114 static SwfdecAsObject *
 115 swfdec_as_super_resolve (SwfdecAsObject *object)
 116 {
 117   SwfdecAsSuper *super = SWFDEC_AS_SUPER (object);
 118
 119   return super->thisp;
 120 }
 121
 122 static void
 123 swfdec_as_super_class_init (SwfdecAsSuperClass *klass)
 124 {
 125   SwfdecAsObjectClass *asobject_class = SWFDEC_AS_OBJECT_CLASS (klass);
 126   SwfdecAsFunctionClass *function_class = SWFDEC_AS_FUNCTION_CLASS (klass);
 127
 128   asobject_class->get = swfdec_as_super_get;
 129   asobject_class->set = swfdec_as_super_set;
 130   asobject_class->set_flags = swfdec_as_super_set_flags;
 131   asobject_class->del = swfdec_as_super_delete;
 132   asobject_class->resolve = swfdec_as_super_resolve;
 133
 134   function_class->call = swfdec_as_super_call;
 135 }
 136
 137 static void
 138 swfdec_as_super_init (SwfdecAsSuper *super)
 139 {
 140 }
 141
 142 void
 143 swfdec_as_super_new (SwfdecAsFrame *frame, SwfdecAsObject *thisp, SwfdecAsObject *ref)
 144 {
 145   SwfdecAsContext *context;
 146   SwfdecAsSuper *super;
 147
 148   g_return_if_fail (frame != NULL);
 149   g_return_if_fail (SWFDEC_IS_AS_OBJECT (thisp));
 150   g_return_if_fail (ref == NULL || SWFDEC_IS_AS_OBJECT (ref));
 151
 152   if (frame->super != NULL)
 153     return;
 154   context = swfdec_gc_object_get_context (thisp);
 155   if (context->version <= 5)
 156     return;
 157
 158   super = g_object_new (SWFDEC_TYPE_AS_SUPER, "context", context, NULL);
 159   frame->super = SWFDEC_AS_OBJECT (super);
 160   super->thisp = swfdec_as_object_resolve (thisp);
 161   if (context->version <= 5) {
 162     super->object = NULL;
 163   } else {
 164     super->object = ref;
 165   }
 166 }
 167
 168 SwfdecAsObject *
 169 swfdec_as_super_resolve_property (SwfdecAsSuper *super, const char *name)
 170 {
 171   SwfdecAsObject *ref;
 172   SwfdecAsContext *context;
 173
 174   g_return_val_if_fail (SWFDEC_IS_AS_SUPER (super), NULL);
 175
 176   if (super->object == NULL)
 177     return NULL;
 178   ref = super->object->prototype;
 179   if (ref == NULL)
 180     return NULL;
 181   context = swfdec_gc_object_get_context (super);
 182   if (name && context->version > 6) {
 183     /* skip prototypes to find the next one that has this function defined */
 184     SwfdecAsObject *res;
 185     if (swfdec_as_object_get_variable_and_flags (ref,
 186          name, NULL, NULL, &res) && ref != res) {
 187       while (ref->prototype != res) {
 188         ref = ref->prototype;
 189         g_assert (ref);
 190       }
 191     }
 192   }
 193   return ref;
 194 }
 195