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 #ifndef GIN_CONVERTER_H_ 6 #define GIN_CONVERTER_H_ 7 8 #include <string> 9 #include <vector> 10 11 #include "base/strings/string_piece.h" 12 #include "gin/gin_export.h" 13 #include "v8/include/v8.h" 14 15 namespace gin { 16 17 template<typename T, typename Enable = void> 18 struct Converter {}; 19 20 template<> 21 struct GIN_EXPORT Converter<bool> { 22 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 23 bool val); 24 static bool FromV8(v8::Isolate* isolate, 25 v8::Handle<v8::Value> val, 26 bool* out); 27 }; 28 29 template<> 30 struct GIN_EXPORT Converter<int32_t> { 31 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 32 int32_t val); 33 static bool FromV8(v8::Isolate* isolate, 34 v8::Handle<v8::Value> val, 35 int32_t* out); 36 }; 37 38 template<> 39 struct GIN_EXPORT Converter<uint32_t> { 40 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 41 uint32_t val); 42 static bool FromV8(v8::Isolate* isolate, 43 v8::Handle<v8::Value> val, 44 uint32_t* out); 45 }; 46 47 template<> 48 struct GIN_EXPORT Converter<int64_t> { 49 // Warning: JavaScript cannot represent 64 integers precisely. 50 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 51 int64_t val); 52 static bool FromV8(v8::Isolate* isolate, 53 v8::Handle<v8::Value> val, 54 int64_t* out); 55 }; 56 57 template<> 58 struct GIN_EXPORT Converter<uint64_t> { 59 // Warning: JavaScript cannot represent 64 integers precisely. 60 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 61 uint64_t val); 62 static bool FromV8(v8::Isolate* isolate, 63 v8::Handle<v8::Value> val, 64 uint64_t* out); 65 }; 66 67 template<> 68 struct GIN_EXPORT Converter<float> { 69 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 70 float val); 71 static bool FromV8(v8::Isolate* isolate, 72 v8::Handle<v8::Value> val, 73 float* out); 74 }; 75 76 template<> 77 struct GIN_EXPORT Converter<double> { 78 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 79 double val); 80 static bool FromV8(v8::Isolate* isolate, 81 v8::Handle<v8::Value> val, 82 double* out); 83 }; 84 85 template<> 86 struct GIN_EXPORT Converter<base::StringPiece> { 87 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 88 const base::StringPiece& val); 89 // No conversion out is possible because StringPiece does not contain storage. 90 }; 91 92 template<> 93 struct GIN_EXPORT Converter<std::string> { 94 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 95 const std::string& val); 96 static bool FromV8(v8::Isolate* isolate, 97 v8::Handle<v8::Value> val, 98 std::string* out); 99 }; 100 101 template<> 102 struct GIN_EXPORT Converter<v8::Handle<v8::Function> > { 103 static bool FromV8(v8::Isolate* isolate, 104 v8::Handle<v8::Value> val, 105 v8::Handle<v8::Function>* out); 106 }; 107 108 template<> 109 struct GIN_EXPORT Converter<v8::Handle<v8::Object> > { 110 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 111 v8::Handle<v8::Object> val); 112 static bool FromV8(v8::Isolate* isolate, 113 v8::Handle<v8::Value> val, 114 v8::Handle<v8::Object>* out); 115 }; 116 117 template<> 118 struct GIN_EXPORT Converter<v8::Handle<v8::ArrayBuffer> > { 119 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 120 v8::Handle<v8::ArrayBuffer> val); 121 static bool FromV8(v8::Isolate* isolate, 122 v8::Handle<v8::Value> val, 123 v8::Handle<v8::ArrayBuffer>* out); 124 }; 125 126 template<> 127 struct GIN_EXPORT Converter<v8::Handle<v8::External> > { 128 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 129 v8::Handle<v8::External> val); 130 static bool FromV8(v8::Isolate* isolate, 131 v8::Handle<v8::Value> val, 132 v8::Handle<v8::External>* out); 133 }; 134 135 template<> 136 struct GIN_EXPORT Converter<v8::Handle<v8::Value> > { 137 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 138 v8::Handle<v8::Value> val); 139 static bool FromV8(v8::Isolate* isolate, 140 v8::Handle<v8::Value> val, 141 v8::Handle<v8::Value>* out); 142 }; 143 144 template<typename T> 145 struct Converter<std::vector<T> > { 146 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, 147 const std::vector<T>& val) { 148 v8::Handle<v8::Array> result( 149 v8::Array::New(isolate, static_cast<int>(val.size()))); 150 for (size_t i = 0; i < val.size(); ++i) { 151 result->Set(static_cast<int>(i), Converter<T>::ToV8(isolate, val[i])); 152 } 153 return result; 154 } 155 156 static bool FromV8(v8::Isolate* isolate, 157 v8::Handle<v8::Value> val, 158 std::vector<T>* out) { 159 if (!val->IsArray()) 160 return false; 161 162 std::vector<T> result; 163 v8::Handle<v8::Array> array(v8::Handle<v8::Array>::Cast(val)); 164 uint32_t length = array->Length(); 165 for (uint32_t i = 0; i < length; ++i) { 166 T item; 167 if (!Converter<T>::FromV8(isolate, array->Get(i), &item)) 168 return false; 169 result.push_back(item); 170 } 171 172 out->swap(result); 173 return true; 174 } 175 }; 176 177 // Convenience functions that deduce T. 178 template<typename T> 179 v8::Handle<v8::Value> ConvertToV8(v8::Isolate* isolate, T input) { 180 return Converter<T>::ToV8(isolate, input); 181 } 182 183 GIN_EXPORT inline v8::Handle<v8::String> StringToV8( 184 v8::Isolate* isolate, 185 const base::StringPiece& input) { 186 return ConvertToV8(isolate, input).As<v8::String>(); 187 } 188 189 GIN_EXPORT v8::Handle<v8::String> StringToSymbol(v8::Isolate* isolate, 190 const base::StringPiece& val); 191 192 template<typename T> 193 bool ConvertFromV8(v8::Isolate* isolate, v8::Handle<v8::Value> input, 194 T* result) { 195 return Converter<T>::FromV8(isolate, input, result); 196 } 197 198 GIN_EXPORT std::string V8ToString(v8::Handle<v8::Value> value); 199 200 } // namespace gin 201 202 #endif // GIN_CONVERTER_H_ 203
