src/squirrel/squirrel/sqclass.cpp

   1 /*\r
   2         see copyright notice in squirrel.h\r
   3 */\r
   4 #include "sqpcheader.h"\r
   5 #include "sqvm.h"\r
   6 #include "sqtable.h"\r
   7 #include "sqclass.h"\r
   8 #include "sqclosure.h"\r
   9 \r
  10 SQClass::SQClass(SQSharedState *ss,SQClass *base)\r
  11 {\r
  12         _uiRef=0;\r
  13         _base = base;\r
  14         _typetag = 0;\r
  15         _metamethods.resize(MT_LAST); //size it to max size\r
  16         if(_base) {\r
  17                 _defaultvalues.copy(base->_defaultvalues);\r
  18                 _methods.copy(base->_methods);\r
  19                 _metamethods.copy(base->_metamethods);\r
  20                 __ObjAddRef(_base);\r
  21         }\r
  22         _members = base?base->_members->Clone() : SQTable::Create(ss,0);\r
  23         __ObjAddRef(_members);\r
  24         _locked = false;\r
  25         INIT_CHAIN();\r
  26         ADD_TO_CHAIN(&_sharedstate->_gc_chain, this);\r
  27 }\r
  28 \r
  29 void SQClass::Finalize() { \r
  30         _attributes = _null_;\r
  31         _defaultvalues.resize(0);\r
  32         _methods.resize(0);\r
  33         _metamethods.resize(0);\r
  34         __ObjRelease(_members);\r
  35         if(_base) {\r
  36                 __ObjRelease(_base);\r
  37         }\r
  38 }\r
  39 \r
  40 SQClass::~SQClass()\r
  41 {\r
  42         REMOVE_FROM_CHAIN(&_sharedstate->_gc_chain, this);\r
  43         Finalize();\r
  44 }\r
  45 \r
  46 bool SQClass::NewSlot(const SQObjectPtr &key,const SQObjectPtr &val)\r
  47 {\r
  48         SQObjectPtr temp;\r
  49         if(_locked) \r
  50                 return false; //the slot already exists\r
  51         if(_members->Get(key,temp) && type(temp) == OT_INTEGER) //overrides the default value\r
  52         {\r
  53                 _defaultvalues[_integer(temp)].val = val;\r
  54                 return true;\r
  55         }\r
  56         if(type(val) == OT_CLOSURE || type(val) == OT_NATIVECLOSURE) {\r
  57                 SQInteger mmidx;\r
  58                 if((mmidx = _sharedstate->GetMetaMethodIdxByName(key)) != -1) {\r
  59                         _metamethods[mmidx] = val;\r
  60                 } \r
  61                 else {\r
  62                         if(type(temp) == OT_NULL) {\r
  63                                 SQClassMemeber m;\r
  64                                 m.val = val;\r
  65                                 _members->NewSlot(key,SQObjectPtr((SQUserPointer)_methods.size()));\r
  66                                 _methods.push_back(m);\r
  67                         }\r
  68                         else {\r
  69                                 _methods[(int)_userpointer(temp)].val = val;\r
  70                         }\r
  71                 }\r
  72                 return true;\r
  73         }\r
  74         SQClassMemeber m;\r
  75         m.val = val;\r
  76         _members->NewSlot(key,SQObjectPtr((SQInteger)_defaultvalues.size()));\r
  77         _defaultvalues.push_back(m);\r
  78         return true;\r
  79 }\r
  80 \r
  81 SQInstance *SQClass::CreateInstance()\r
  82 {\r
  83         if(!_locked) Lock();\r
  84         return SQInstance::Create(_opt_ss(this),this);\r
  85 }\r
  86 \r
  87 int SQClass::Next(const SQObjectPtr &refpos, SQObjectPtr &outkey, SQObjectPtr &outval)\r
  88 {\r
  89         SQObjectPtr oval;\r
  90         int idx = _members->Next(refpos,outkey,oval);\r
  91         if(idx != -1) {\r
  92                 if(type(oval) != OT_INTEGER) {\r
  93                         outval = _methods[(int)_userpointer(oval)].val;\r
  94                 }\r
  95                 else {\r
  96                         outval = _defaultvalues[_integer(oval)].val;\r
  97                 }\r
  98         }\r
  99         return idx;\r
 100 }\r
 101 \r
 102 bool SQClass::SetAttributes(const SQObjectPtr &key,const SQObjectPtr &val)\r
 103 {\r
 104         SQObjectPtr idx;\r
 105         if(_members->Get(key,idx)) {\r
 106                 if(type(idx) == OT_INTEGER)\r
 107                         _defaultvalues[_integer(idx)].attrs = val;\r
 108                 else\r
 109                         _methods[(int)_userpointer(idx)].attrs = val;\r
 110                 return true;\r
 111         }\r
 112         return false;\r
 113 }\r
 114 \r
 115 bool SQClass::GetAttributes(const SQObjectPtr &key,SQObjectPtr &outval)\r
 116 {\r
 117         SQObjectPtr idx;\r
 118         if(_members->Get(key,idx)) {\r
 119                 outval = (type(idx) == OT_INTEGER?_defaultvalues[_integer(idx)].attrs:_methods[(int)_userpointer(idx)].attrs);\r
 120                 return true;\r
 121         }\r
 122         return false;\r
 123 }\r
 124 \r
 125 ///////////////////////////////////////////////////////////////////////\r
 126 void SQInstance::Init(SQSharedState *ss)\r
 127 {\r
 128         _uiRef = 0;\r
 129         _userpointer = NULL;\r
 130         _hook = NULL;\r
 131         __ObjAddRef(_class);\r
 132         _delegate = _class->_members;\r
 133         INIT_CHAIN();\r
 134         ADD_TO_CHAIN(&_sharedstate->_gc_chain, this);\r
 135 }\r
 136 \r
 137 SQInstance::SQInstance(SQSharedState *ss, SQClass *c)\r
 138 {\r
 139         _class = c;\r
 140         _values.resize(_class->_defaultvalues.size());\r
 141         for(unsigned int i = 0; i < _class->_defaultvalues.size(); i++) {\r
 142                 _values[i] = _class->_defaultvalues[i].val;\r
 143         }\r
 144         Init(ss);\r
 145 }\r
 146 \r
 147 SQInstance::SQInstance(SQSharedState *ss, SQInstance *i)\r
 148 {\r
 149         _class = i->_class;\r
 150         _values.copy(i->_values);\r
 151         Init(ss);\r
 152 }\r
 153 \r
 154 void SQInstance::Finalize() \r
 155 {\r
 156         __ObjRelease(_class);\r
 157         _values.resize(0);\r
 158 }\r
 159 \r
 160 SQInstance::~SQInstance()\r
 161 {\r
 162         REMOVE_FROM_CHAIN(&_sharedstate->_gc_chain, this);\r
 163         Finalize();\r
 164 }\r
 165 \r
 166 bool SQInstance::GetMetaMethod(SQMetaMethod mm,SQObjectPtr &res)\r
 167 {\r
 168         if(type(_class->_metamethods[mm]) != OT_NULL) {\r
 169                 res = _class->_metamethods[mm];\r
 170                 return true;\r
 171         }\r
 172         return false;\r
 173 }\r
 174 \r
 175 bool SQInstance::InstanceOf(SQClass *trg)\r
 176 {\r
 177         SQClass *parent = _class;\r
 178         while(parent != NULL) {\r
 179                 if(parent == trg)\r
 180                         return true;\r
 181                 parent = parent->_base;\r
 182         }\r
 183         return false;\r
 184 }\r