gin/converter.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/converter.h"
   6
   7 #include "v8/include/v8.h"
   8
   9 using v8::ArrayBuffer;
  10 using v8::Boolean;
  11 using v8::External;
  12 using v8::Function;
  13 using v8::Handle;
  14 using v8::Integer;
  15 using v8::Isolate;
  16 using v8::Number;
  17 using v8::Object;
  18 using v8::String;
  19 using v8::Value;
  20
  21 namespace gin {
  22
  23 Handle<Value> Converter<bool>::ToV8(Isolate* isolate, bool val) {
  24   return Boolean::New(isolate, val).As<Value>();
  25 }
  26
  27 bool Converter<bool>::FromV8(Isolate* isolate, Handle<Value> val, bool* out) {
  28   *out = val->BooleanValue();
  29   return true;
  30 }
  31
  32 Handle<Value> Converter<int32_t>::ToV8(Isolate* isolate, int32_t val) {
  33   return Integer::New(isolate, val).As<Value>();
  34 }
  35
  36 bool Converter<int32_t>::FromV8(Isolate* isolate, Handle<Value> val,
  37                                 int32_t* out) {
  38   if (!val->IsInt32())
  39     return false;
  40   *out = val->Int32Value();
  41   return true;
  42 }
  43
  44 Handle<Value> Converter<uint32_t>::ToV8(Isolate* isolate, uint32_t val) {
  45   return Integer::NewFromUnsigned(isolate, val).As<Value>();
  46 }
  47
  48 bool Converter<uint32_t>::FromV8(Isolate* isolate, Handle<Value> val,
  49                                  uint32_t* out) {
  50   if (!val->IsUint32())
  51     return false;
  52   *out = val->Uint32Value();
  53   return true;
  54 }
  55
  56 Handle<Value> Converter<int64_t>::ToV8(Isolate* isolate, int64_t val) {
  57   return Number::New(isolate, static_cast<double>(val)).As<Value>();
  58 }
  59
  60 bool Converter<int64_t>::FromV8(Isolate* isolate, Handle<Value> val,
  61                                 int64_t* out) {
  62   if (!val->IsNumber())
  63     return false;
  64   // Even though IntegerValue returns int64_t, JavaScript cannot represent
  65   // the full precision of int64_t, which means some rounding might occur.
  66   *out = val->IntegerValue();
  67   return true;
  68 }
  69
  70 Handle<Value> Converter<uint64_t>::ToV8(Isolate* isolate, uint64_t val) {
  71   return Number::New(isolate, static_cast<double>(val)).As<Value>();
  72 }
  73
  74 bool Converter<uint64_t>::FromV8(Isolate* isolate, Handle<Value> val,
  75                                  uint64_t* out) {
  76   if (!val->IsNumber())
  77     return false;
  78   *out = static_cast<uint64_t>(val->IntegerValue());
  79   return true;
  80 }
  81
  82 Handle<Value> Converter<double>::ToV8(Isolate* isolate, double val) {
  83   return Number::New(isolate, val).As<Value>();
  84 }
  85
  86 bool Converter<double>::FromV8(Isolate* isolate, Handle<Value> val,
  87                                double* out) {
  88   if (!val->IsNumber())
  89     return false;
  90   *out = val->NumberValue();
  91   return true;
  92 }
  93
  94 Handle<Value> Converter<base::StringPiece>::ToV8(
  95     Isolate* isolate, const base::StringPiece& val) {
  96   return String::NewFromUtf8(isolate, val.data(), String::kNormalString,
  97                              static_cast<uint32_t>(val.length()));
  98 }
  99
 100 Handle<Value> Converter<std::string>::ToV8(Isolate* isolate,
 101                                            const std::string& val) {
 102   return Converter<base::StringPiece>::ToV8(isolate, val);
 103 }
 104
 105 bool Converter<std::string>::FromV8(Isolate* isolate, Handle<Value> val,
 106                                     std::string* out) {
 107   if (!val->IsString())
 108     return false;
 109   Handle<String> str = Handle<String>::Cast(val);
 110   int length = str->Utf8Length();
 111   out->resize(length);
 112   str->WriteUtf8(&(*out)[0], length, NULL, String::NO_NULL_TERMINATION);
 113   return true;
 114 }
 115
 116 bool Converter<Handle<Function> >::FromV8(Isolate* isolate, Handle<Value> val,
 117                                           Handle<Function>* out) {
 118   if (!val->IsFunction())
 119     return false;
 120   *out = Handle<Function>::Cast(val);
 121   return true;
 122 }
 123
 124 Handle<Value> Converter<Handle<Object> >::ToV8(Isolate* isolate,
 125                                                Handle<Object> val) {
 126   return val.As<Value>();
 127 }
 128
 129 bool Converter<Handle<Object> >::FromV8(Isolate* isolate, Handle<Value> val,
 130                                         Handle<Object>* out) {
 131   if (!val->IsObject())
 132     return false;
 133   *out = Handle<Object>::Cast(val);
 134   return true;
 135 }
 136
 137 Handle<Value> Converter<Handle<ArrayBuffer> >::ToV8(Isolate* isolate,
 138                                                     Handle<ArrayBuffer> val) {
 139   return val.As<Value>();
 140 }
 141
 142 bool Converter<Handle<ArrayBuffer> >::FromV8(Isolate* isolate,
 143                                              Handle<Value> val,
 144                                              Handle<ArrayBuffer>* out) {
 145   if (!val->IsArrayBuffer())
 146     return false;
 147   *out = Handle<ArrayBuffer>::Cast(val);
 148   return true;
 149 }
 150
 151 Handle<Value> Converter<Handle<External> >::ToV8(Isolate* isolate,
 152                                                  Handle<External> val) {
 153   return val.As<Value>();
 154 }
 155
 156 bool Converter<Handle<External> >::FromV8(Isolate* isolate,
 157                                           v8::Handle<Value> val,
 158                                           Handle<External>* out) {
 159   if (!val->IsExternal())
 160     return false;
 161   *out = Handle<External>::Cast(val);
 162   return true;
 163 }
 164
 165 Handle<Value> Converter<Handle<Value> >::ToV8(Isolate* isolate,
 166                                               Handle<Value> val) {
 167   return val;
 168 }
 169
 170 bool Converter<Handle<Value> >::FromV8(Isolate* isolate, Handle<Value> val,
 171                                        Handle<Value>* out) {
 172   *out = val;
 173   return true;
 174 }
 175
 176 v8::Handle<v8::String> StringToSymbol(v8::Isolate* isolate,
 177                                       const base::StringPiece& val) {
 178   return String::NewFromUtf8(isolate,
 179                              val.data(),
 180                              String::kInternalizedString,
 181                              static_cast<uint32_t>(val.length()));
 182 }
 183
 184 std::string V8ToString(v8::Handle<v8::Value> value) {
 185   if (value.IsEmpty())
 186     return std::string();
 187   std::string result;
 188   if (!ConvertFromV8(NULL, value, &result))
 189     return std::string();
 190   return result;
 191 }
 192
 193 }  // namespace gin