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// Copyright (c) 2016 GeometryFactory Sarl (France)
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Three/include/CGAL/Three/exceptions.h $
// $Id: include/CGAL/Three/exceptions.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Laurent RINEAU
#ifndef CGAL_THREE_EXCEPTIONS_H
#define CGAL_THREE_EXCEPTIONS_H
#include <CGAL/license/Three.h>
#include <exception>
#include <QString>
#include <QApplication>
#include <optional>
#include <QStringList>
namespace CGAL{
namespace Three{
class Script_exception : public std::runtime_error {
QStringList bt;
public:
Script_exception(QString what_arg,
QStringList backtrace)
: std::runtime_error(what_arg.toStdString())
, bt(backtrace)
{}
QStringList backtrace() const {
return bt;
}
};
template <typename T>
struct Optional_or_bool {
typedef std::optional<T> type;
template <typename Callable>
static type invoke(Callable f) { return type(f()); }
};
template <>
struct Optional_or_bool<void> {
typedef bool type;
template <typename Callable>
static type invoke(Callable f) { f(); return true; }
};
/// This function template wraps a `Callable` that can be called without
/// any argument (such as a lambda expression without arguments), and in
/// case the function call is in a Qt Script context, wraps the call in a
/// try/catch that converts the possible exception throw into a Qt Script
/// exception. That allows a Qt Script to catch the exception and deal
/// with it.
template <typename Callable>
typename Optional_or_bool<typename cpp11::result_of<Callable()>::type>::type
wrap_a_call_to_cpp(Callable f,
QObject* object = 0,
const char* file = 0,
int line = -1) {
typedef decltype(f()) Callable_RT;
typedef Optional_or_bool<Callable_RT> O_r_b;
QJSEngine* script_engine = qjsEngine(object);
const bool no_try_catch = qApp->property("no-try-catch").toBool();
if(no_try_catch || script_engine == 0) return O_r_b::invoke(f);
else
try {
return O_r_b::invoke(f);
}
catch(const std::exception& e) {
const Script_exception* se = dynamic_cast<const Script_exception*>(&e);
QStringList qt_bt;
if(se) {
qt_bt = se->backtrace();
if(qt_bt.size() != 0) std::cerr << "Backtrace:\n";
}
QJSValue js_bt = script_engine->newArray(qt_bt.size());
if(qt_bt.size() != 0) {
quint32 i = 0;
for(auto s: qt_bt)
{
std::cerr << " " << qPrintable(s) << std::endl;
js_bt.setProperty(i++, s);
}
}
QString error;
if(se) {
error = se->what();
} else {
error = QObject::tr("Error");
QString context;
if(file != 0) context += QObject::tr(" at file %1").arg(file);
if(line != -1) context += QString(":%1").arg(line);
error += QString(": %1").arg(e.what());
}
QJSValue error_value = script_engine->newErrorObject(QJSValue::GenericError, error);
error_value.setProperty("backtrace", js_bt);
script_engine->throwError(error_value);
return {};
}
}
} // end namespace Three
} // end namespace CGAL
#endif // CGAL_THREE_EXCEPTIONS_H
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