gin/arguments.cc

   1 // Copyright 2013 The Chromium Authors
   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/arguments.h"
   6
   7 #include "base/strings/stringprintf.h"
   8 #include "gin/converter.h"
   9 #include "v8/include/v8-exception.h"
  10 #include "v8/include/v8-isolate.h"
  11 #include "v8/include/v8-object.h"
  12 #include "v8/include/v8-template.h"
  13
  14 namespace gin {
  15
  16 Arguments::Arguments()
  17     : isolate_(nullptr), info_for_function_(nullptr), is_for_property_(false) {}
  18
  19 Arguments::Arguments(const v8::FunctionCallbackInfo<v8::Value>& info)
  20     : isolate_(info.GetIsolate()),
  21       info_for_function_(&info),
  22       is_for_property_(false) {}
  23
  24 Arguments::Arguments(const v8::PropertyCallbackInfo<v8::Value>& info)
  25     : isolate_(info.GetIsolate()),
  26       info_for_property_(&info),
  27       is_for_property_(true) {}
  28
  29 Arguments::~Arguments() = default;
  30
  31 v8::Local<v8::Value> Arguments::PeekNext() const {
  32   if (is_for_property_)
  33     return v8::Local<v8::Value>();
  34   if (next_ >= info_for_function_->Length())
  35     return v8::Local<v8::Value>();
  36   return (*info_for_function_)[next_];
  37 }
  38
  39 v8::LocalVector<v8::Value> Arguments::GetAll() const {
  40   v8::LocalVector<v8::Value> result(isolate_);
  41   if (is_for_property_)
  42     return result;
  43
  44   int length = info_for_function_->Length();
  45   if (length == 0)
  46     return result;
  47
  48   result.reserve(length);
  49   for (int i = 0; i < length; ++i)
  50     result.push_back((*info_for_function_)[i]);
  51
  52   return result;
  53 }
  54
  55 v8::Local<v8::Context> Arguments::GetHolderCreationContext() const {
  56   v8::Local<v8::Object> holder = is_for_property_
  57                                      ? info_for_property_->Holder()
  58                                      : info_for_function_->Holder();
  59   return holder->GetCreationContextChecked();
  60 }
  61
  62 std::string V8TypeAsString(v8::Isolate* isolate, v8::Local<v8::Value> value) {
  63   if (value.IsEmpty())
  64     return "<empty handle>";
  65   if (value->IsUndefined())
  66     return "undefined";
  67   if (value->IsNull())
  68     return "null";
  69   std::string result;
  70   if (!ConvertFromV8(isolate, value, &result))
  71     return std::string();
  72   return result;
  73 }
  74
  75 void Arguments::ThrowError() const {
  76   if (is_for_property_)
  77     return ThrowTypeError("Error processing property accessor arguments.");
  78
  79   if (insufficient_arguments_)
  80     return ThrowTypeError("Insufficient number of arguments.");
  81
  82   v8::Local<v8::Value> value = (*info_for_function_)[next_ - 1];
  83   return ThrowTypeError(base::StringPrintf(
  84       "Error processing argument at index %d, conversion failure from %s",
  85       next_ - 1, V8TypeAsString(isolate_, value).c_str()));
  86 }
  87
  88 void Arguments::ThrowTypeError(const std::string& message) const {
  89   isolate_->ThrowException(v8::Exception::TypeError(
  90       StringToV8(isolate_, message)));
  91 }
  92
  93 bool Arguments::IsConstructCall() const {
  94   return !is_for_property_ && info_for_function_->IsConstructCall();
  95 }
  96
  97 }  // namespace gin