gin/arguments.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/arguments.h"
   6
   7 #include "base/strings/stringprintf.h"
   8 #include "gin/converter.h"
   9
  10 namespace gin {
  11
  12 Arguments::Arguments()
  13     : isolate_(NULL),
  14       info_(NULL),
  15       next_(0),
  16       insufficient_arguments_(false) {
  17 }
  18
  19 Arguments::Arguments(const v8::FunctionCallbackInfo<v8::Value>& info)
  20     : isolate_(info.GetIsolate()),
  21       info_(&info),
  22       next_(0),
  23       insufficient_arguments_(false) {
  24 }
  25
  26 Arguments::~Arguments() {
  27 }
  28
  29 v8::Local<v8::Value> Arguments::PeekNext() const {
  30   if (next_ >= info_->Length())
  31     return v8::Local<v8::Value>();
  32   return (*info_)[next_];
  33 }
  34
  35 std::string V8TypeAsString(v8::Local<v8::Value> value) {
  36   if (value.IsEmpty())
  37     return "<empty handle>";
  38   if (value->IsUndefined())
  39     return "undefined";
  40   if (value->IsNull())
  41     return "null";
  42   std::string result;
  43   if (!ConvertFromV8(NULL, value, &result))
  44     return std::string();
  45   return result;
  46 }
  47
  48 void Arguments::ThrowError() const {
  49   if (insufficient_arguments_)
  50     return ThrowTypeError("Insufficient number of arguments.");
  51
  52   return ThrowTypeError(base::StringPrintf(
  53       "Error processing argument at index %d, conversion failure from %s",
  54       next_ - 1, V8TypeAsString((*info_)[next_ - 1]).c_str()));
  55 }
  56
  57 void Arguments::ThrowTypeError(const std::string& message) const {
  58   isolate_->ThrowException(v8::Exception::TypeError(
  59       StringToV8(isolate_, message)));
  60 }
  61
  62 bool Arguments::IsConstructCall() const {
  63   return info_->IsConstructCall();
  64 }
  65
  66 }  // namespace gin