Add convient function for converting args from V8 Arguments.

This commit is contained in:
Cheng Zhao 2013-09-23 22:48:55 +08:00
parent a0d1a7620c
commit 1e5e0194bd

View file

@ -12,7 +12,7 @@
#include "browser/api/atom_api_window.h"
#include "v8/include/v8.h"
// Trick to overload functions by return value's type.
// Convert V8 value to arbitrary supported types.
struct FromV8Value {
explicit FromV8Value(v8::Handle<v8::Value> value) : value_(value) {}
@ -58,6 +58,7 @@ struct FromV8Value {
v8::Handle<v8::Value> value_;
};
// Convert arbitrary supported native type to V8 value.
inline v8::Handle<v8::Value> ToV8Value(const base::FilePath& path) {
std::string path_string(path.AsUTF8Unsafe());
return v8::String::New(path_string.data(), path_string.size());
@ -71,7 +72,6 @@ inline v8::Handle<v8::Value> ToV8Value(int code) {
return v8::Integer::New(code);
}
inline
v8::Handle<v8::Value> ToV8Value(const std::vector<base::FilePath>& paths) {
v8::Handle<v8::Array> result = v8::Array::New(paths.size());
for (size_t i = 0; i < paths.size(); ++i)
@ -79,4 +79,117 @@ v8::Handle<v8::Value> ToV8Value(const std::vector<base::FilePath>& paths) {
return result;
}
// Check if a V8 Value is of specified type.
template<class T> inline
bool V8ValueCanBeConvertedTo(v8::Handle<v8::Value> value) {
return false;
}
template<> inline
bool V8ValueCanBeConvertedTo<int>(v8::Handle<v8::Value> value) {
return value->IsNumber();
}
template<> inline
bool V8ValueCanBeConvertedTo<std::string>(v8::Handle<v8::Value> value) {
return value->IsString();
}
template<> inline
bool V8ValueCanBeConvertedTo<base::FilePath>(v8::Handle<v8::Value> value) {
return V8ValueCanBeConvertedTo<std::string>(value);
}
template<> inline
bool V8ValueCanBeConvertedTo<std::vector<std::string>>(
v8::Handle<v8::Value> value) {
return value->IsArray();
}
template<>
bool V8ValueCanBeConvertedTo<atom::NativeWindow*>(v8::Handle<v8::Value> value) {
using atom::api::Window;
if (value->IsObject()) {
Window* window = Window::Unwrap<Window>(value->ToObject());
if (window && window->window())
return true;
}
return false;
}
template<> inline
bool V8ValueCanBeConvertedTo<v8::Persistent<v8::Function>>(
v8::Handle<v8::Value> value) {
return value->IsFunction();
}
// Check and convert V8's Arguments to native types.
template<typename T1, int index = 0>
bool FromV8Arguments(const v8::Arguments& args, T1* value) {
if (!V8ValueCanBeConvertedTo<T1>(args[index]))
return false;
*value = static_cast<const T1&>(FromV8Value(args[index]));
return true;
}
template<typename T1, typename T2>
bool FromV8Arguments(const v8::Arguments& args, T1* a1, T2* a2) {
return FromV8Arguments<T1>(args, a1) && FromV8Arguments<T2, 1>(args, a2);
}
template<typename T1, typename T2, typename T3>
bool FromV8Arguments(const v8::Arguments& args, T1* a1, T2* a2, T3* a3) {
return FromV8Arguments<T1, T2>(args, a1, a2) &&
FromV8Arguments<T3, 2>(args, a3);
}
template<typename T1, typename T2, typename T3, typename T4>
bool FromV8Arguments(const v8::Arguments& args,
T1* a1,
T2* a2,
T3* a3,
T4* a4) {
return FromV8Arguments<T1, T2, T3>(args, a1, a2, a3) &&
FromV8Arguments<T4, 3>(args, a4);
}
template<typename T1, typename T2, typename T3, typename T4, typename T5>
bool FromV8Arguments(const v8::Arguments& args,
T1* a1,
T2* a2,
T3* a3,
T4* a4,
T5* a5) {
return FromV8Arguments<T1, T2, T3, T4>(args, a1, a2, a3, a4) &&
FromV8Arguments<T5, 4>(args, a5);
}
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6>
bool FromV8Arguments(const v8::Arguments& args,
T1* a1,
T2* a2,
T3* a3,
T4* a4,
T5* a5,
T6* a6) {
return FromV8Arguments<T1, T2, T3, T4, T5>(args, a1, a2, a3, a4, a5) &&
FromV8Arguments<T6, 5>(args, a6);
}
template<typename T1, typename T2, typename T3, typename T4, typename T5,
typename T6, typename T7>
bool FromV8Arguments(const v8::Arguments& args,
T1* a1,
T2* a2,
T3* a3,
T4* a4,
T5* a5,
T6* a6,
T7* a7) {
return
FromV8Arguments<T1, T2, T3, T4, T5, T6>(args, a1, a2, a3, a4, a5, a6) &&
FromV8Arguments<T7, 6>(args, a7);
}
#endif // COMMON_V8_CONVERSIONS_H_