gin/object_template_builder.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gin/object_template_builder.h"
   6
   7 #include "gin/interceptor.h"
   8 #include "gin/per_isolate_data.h"
   9 #include "gin/public/wrapper_info.h"
  10
  11 namespace gin {
  12
  13 namespace {
  14
  15 WrappableBase* WrappableFromV8(v8::Isolate* isolate,
  16                                v8::Handle<v8::Value> val) {
  17   if (!val->IsObject())
  18     return NULL;
  19   v8::Handle<v8::Object> obj = v8::Handle<v8::Object>::Cast(val);
  20   WrapperInfo* info = WrapperInfo::From(obj);
  21
  22   // If this fails, the object is not managed by Gin.
  23   if (!info)
  24     return NULL;
  25
  26   // We don't further validate the type of the object, but assume it's derived
  27   // from WrappableBase. We look up the pointer in a global registry, to make
  28   // sure it's actually pointed to a valid life object.
  29   return static_cast<WrappableBase*>(
  30       obj->GetAlignedPointerFromInternalField(kEncodedValueIndex));
  31 }
  32
  33 NamedPropertyInterceptor* NamedInterceptorFromV8(v8::Isolate* isolate,
  34                                                  v8::Handle<v8::Value> val) {
  35   WrappableBase* base = WrappableFromV8(isolate, val);
  36   if (!base)
  37     return NULL;
  38   return PerIsolateData::From(isolate)->GetNamedPropertyInterceptor(base);
  39 }
  40
  41 IndexedPropertyInterceptor* IndexedInterceptorFromV8(
  42     v8::Isolate* isolate,
  43     v8::Handle<v8::Value> val) {
  44   WrappableBase* base = WrappableFromV8(isolate, val);
  45   if (!base)
  46     return NULL;
  47   return PerIsolateData::From(isolate)->GetIndexedPropertyInterceptor(base);
  48 }
  49
  50 void NamedPropertyGetter(v8::Local<v8::String> property,
  51                          const v8::PropertyCallbackInfo<v8::Value>& info) {
  52   v8::Isolate* isolate = info.GetIsolate();
  53   NamedPropertyInterceptor* interceptor =
  54       NamedInterceptorFromV8(isolate, info.Holder());
  55   if (!interceptor)
  56     return;
  57   std::string name;
  58   ConvertFromV8(isolate, property, &name);
  59   info.GetReturnValue().Set(interceptor->GetNamedProperty(isolate, name));
  60 }
  61
  62 void NamedPropertySetter(v8::Local<v8::String> property,
  63                          v8::Local<v8::Value> value,
  64                          const v8::PropertyCallbackInfo<v8::Value>& info) {
  65   v8::Isolate* isolate = info.GetIsolate();
  66   NamedPropertyInterceptor* interceptor =
  67       NamedInterceptorFromV8(isolate, info.Holder());
  68   if (!interceptor)
  69     return;
  70   std::string name;
  71   ConvertFromV8(isolate, property, &name);
  72   interceptor->SetNamedProperty(isolate, name, value);
  73 }
  74
  75 void NamedPropertyQuery(v8::Local<v8::String> property,
  76                         const v8::PropertyCallbackInfo<v8::Integer>& info) {
  77   v8::Isolate* isolate = info.GetIsolate();
  78   NamedPropertyInterceptor* interceptor =
  79       NamedInterceptorFromV8(isolate, info.Holder());
  80   if (!interceptor)
  81     return;
  82   std::string name;
  83   ConvertFromV8(isolate, property, &name);
  84   if (interceptor->GetNamedProperty(isolate, name).IsEmpty())
  85     return;
  86   info.GetReturnValue().Set(0);
  87 }
  88
  89 void NamedPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info) {
  90   v8::Isolate* isolate = info.GetIsolate();
  91   NamedPropertyInterceptor* interceptor =
  92       NamedInterceptorFromV8(isolate, info.Holder());
  93   if (!interceptor)
  94     return;
  95   info.GetReturnValue().Set(v8::Handle<v8::Array>::Cast(
  96       ConvertToV8(isolate, interceptor->EnumerateNamedProperties(isolate))));
  97 }
  98
  99 void IndexedPropertyGetter(uint32_t index,
 100                            const v8::PropertyCallbackInfo<v8::Value>& info) {
 101   v8::Isolate* isolate = info.GetIsolate();
 102   IndexedPropertyInterceptor* interceptor =
 103       IndexedInterceptorFromV8(isolate, info.Holder());
 104   if (!interceptor)
 105     return;
 106   info.GetReturnValue().Set(interceptor->GetIndexedProperty(isolate, index));
 107 }
 108
 109 void IndexedPropertySetter(uint32_t index,
 110                            v8::Local<v8::Value> value,
 111                            const v8::PropertyCallbackInfo<v8::Value>& info) {
 112   v8::Isolate* isolate = info.GetIsolate();
 113   IndexedPropertyInterceptor* interceptor =
 114       IndexedInterceptorFromV8(isolate, info.Holder());
 115   if (!interceptor)
 116     return;
 117   interceptor->SetIndexedProperty(isolate, index, value);
 118 }
 119
 120 void IndexedPropertyEnumerator(
 121     const v8::PropertyCallbackInfo<v8::Array>& info) {
 122   v8::Isolate* isolate = info.GetIsolate();
 123   IndexedPropertyInterceptor* interceptor =
 124       IndexedInterceptorFromV8(isolate, info.Holder());
 125   if (!interceptor)
 126     return;
 127   info.GetReturnValue().Set(v8::Handle<v8::Array>::Cast(
 128       ConvertToV8(isolate, interceptor->EnumerateIndexedProperties(isolate))));
 129 }
 130
 131 }  // namespace
 132
 133 ObjectTemplateBuilder::ObjectTemplateBuilder(v8::Isolate* isolate)
 134     : isolate_(isolate), template_(v8::ObjectTemplate::New(isolate)) {
 135   template_->SetInternalFieldCount(kNumberOfInternalFields);
 136 }
 137
 138 ObjectTemplateBuilder::~ObjectTemplateBuilder() {
 139 }
 140
 141 ObjectTemplateBuilder& ObjectTemplateBuilder::AddNamedPropertyInterceptor() {
 142   template_->SetNamedPropertyHandler(&NamedPropertyGetter,
 143                                      &NamedPropertySetter,
 144                                      &NamedPropertyQuery,
 145                                      NULL,
 146                                      &NamedPropertyEnumerator);
 147   return *this;
 148 }
 149
 150 ObjectTemplateBuilder& ObjectTemplateBuilder::AddIndexedPropertyInterceptor() {
 151   template_->SetIndexedPropertyHandler(&IndexedPropertyGetter,
 152                                        &IndexedPropertySetter,
 153                                        NULL,
 154                                        NULL,
 155                                        &IndexedPropertyEnumerator);
 156   return *this;
 157 }
 158
 159 ObjectTemplateBuilder& ObjectTemplateBuilder::SetImpl(
 160     const base::StringPiece& name, v8::Handle<v8::Data> val) {
 161   template_->Set(StringToSymbol(isolate_, name), val);
 162   return *this;
 163 }
 164
 165 ObjectTemplateBuilder& ObjectTemplateBuilder::SetPropertyImpl(
 166     const base::StringPiece& name, v8::Handle<v8::FunctionTemplate> getter,
 167     v8::Handle<v8::FunctionTemplate> setter) {
 168   template_->SetAccessorProperty(StringToSymbol(isolate_, name), getter,
 169                                  setter);
 170   return *this;
 171 }
 172
 173 v8::Local<v8::ObjectTemplate> ObjectTemplateBuilder::Build() {
 174   v8::Local<v8::ObjectTemplate> result = template_;
 175   template_.Clear();
 176   return result;
 177 }
 178
 179 }  // namespace gin