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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#ifndef CATCH_GENERATORS_HPP_INCLUDED
#define CATCH_GENERATORS_HPP_INCLUDED
#include <catch2/catch_tostring.hpp>
#include <catch2/interfaces/catch_interfaces_generatortracker.hpp>
#include <catch2/internal/catch_source_line_info.hpp>
#include <catch2/internal/catch_stringref.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
#include <catch2/internal/catch_unique_name.hpp>
#include <vector>
#include <tuple>
namespace Catch {
namespace Generators {
namespace Detail {
//! Throws GeneratorException with the provided message
[[noreturn]]
void throw_generator_exception(char const * msg);
} // end namespace detail
template<typename T>
class IGenerator : public GeneratorUntypedBase {
std::string stringifyImpl() const override {
return ::Catch::Detail::stringify( get() );
}
public:
// Returns the current element of the generator
//
// \Precondition The generator is either freshly constructed,
// or the last call to `next()` returned true
virtual T const& get() const = 0;
using type = T;
};
template <typename T>
using GeneratorPtr = Catch::Detail::unique_ptr<IGenerator<T>>;
template <typename T>
class GeneratorWrapper final {
GeneratorPtr<T> m_generator;
public:
//! Takes ownership of the passed pointer.
GeneratorWrapper(IGenerator<T>* generator):
m_generator(generator) {}
GeneratorWrapper(GeneratorPtr<T> generator):
m_generator(CATCH_MOVE(generator)) {}
T const& get() const {
return m_generator->get();
}
bool next() {
return m_generator->countedNext();
}
};
template<typename T>
class SingleValueGenerator final : public IGenerator<T> {
T m_value;
public:
SingleValueGenerator(T const& value) :
m_value(value)
{}
SingleValueGenerator(T&& value):
m_value(CATCH_MOVE(value))
{}
T const& get() const override {
return m_value;
}
bool next() override {
return false;
}
};
template<typename T>
class FixedValuesGenerator final : public IGenerator<T> {
static_assert(!std::is_same<T, bool>::value,
"FixedValuesGenerator does not support bools because of std::vector<bool>"
"specialization, use SingleValue Generator instead.");
std::vector<T> m_values;
size_t m_idx = 0;
public:
FixedValuesGenerator( std::initializer_list<T> values ) : m_values( values ) {}
T const& get() const override {
return m_values[m_idx];
}
bool next() override {
++m_idx;
return m_idx < m_values.size();
}
};
template <typename T, typename DecayedT = std::decay_t<T>>
GeneratorWrapper<DecayedT> value( T&& value ) {
return GeneratorWrapper<DecayedT>(
Catch::Detail::make_unique<SingleValueGenerator<DecayedT>>(
CATCH_FORWARD( value ) ) );
}
template <typename T>
GeneratorWrapper<T> values(std::initializer_list<T> values) {
return GeneratorWrapper<T>(Catch::Detail::make_unique<FixedValuesGenerator<T>>(values));
}
template<typename T>
class Generators : public IGenerator<T> {
std::vector<GeneratorWrapper<T>> m_generators;
size_t m_current = 0;
void add_generator( GeneratorWrapper<T>&& generator ) {
m_generators.emplace_back( CATCH_MOVE( generator ) );
}
void add_generator( T const& val ) {
m_generators.emplace_back( value( val ) );
}
void add_generator( T&& val ) {
m_generators.emplace_back( value( CATCH_MOVE( val ) ) );
}
template <typename U>
std::enable_if_t<!std::is_same<std::decay_t<U>, T>::value>
add_generator( U&& val ) {
add_generator( T( CATCH_FORWARD( val ) ) );
}
template <typename U> void add_generators( U&& valueOrGenerator ) {
add_generator( CATCH_FORWARD( valueOrGenerator ) );
}
template <typename U, typename... Gs>
void add_generators( U&& valueOrGenerator, Gs&&... moreGenerators ) {
add_generator( CATCH_FORWARD( valueOrGenerator ) );
add_generators( CATCH_FORWARD( moreGenerators )... );
}
public:
template <typename... Gs>
Generators(Gs &&... moreGenerators) {
m_generators.reserve(sizeof...(Gs));
add_generators(CATCH_FORWARD(moreGenerators)...);
}
T const& get() const override {
return m_generators[m_current].get();
}
bool next() override {
if (m_current >= m_generators.size()) {
return false;
}
const bool current_status = m_generators[m_current].next();
if (!current_status) {
++m_current;
}
return m_current < m_generators.size();
}
};
template <typename... Ts>
GeneratorWrapper<std::tuple<std::decay_t<Ts>...>>
table( std::initializer_list<std::tuple<std::decay_t<Ts>...>> tuples ) {
return values<std::tuple<Ts...>>( tuples );
}
// Tag type to signal that a generator sequence should convert arguments to a specific type
template <typename T>
struct as {};
template<typename T, typename... Gs>
auto makeGenerators( GeneratorWrapper<T>&& generator, Gs &&... moreGenerators ) -> Generators<T> {
return Generators<T>(CATCH_MOVE(generator), CATCH_FORWARD(moreGenerators)...);
}
template<typename T>
auto makeGenerators( GeneratorWrapper<T>&& generator ) -> Generators<T> {
return Generators<T>(CATCH_MOVE(generator));
}
template<typename T, typename... Gs>
auto makeGenerators( T&& val, Gs &&... moreGenerators ) -> Generators<std::decay_t<T>> {
return makeGenerators( value( CATCH_FORWARD( val ) ), CATCH_FORWARD( moreGenerators )... );
}
template<typename T, typename U, typename... Gs>
auto makeGenerators( as<T>, U&& val, Gs &&... moreGenerators ) -> Generators<T> {
return makeGenerators( value( T( CATCH_FORWARD( val ) ) ), CATCH_FORWARD( moreGenerators )... );
}
IGeneratorTracker* acquireGeneratorTracker( StringRef generatorName,
SourceLineInfo const& lineInfo );
IGeneratorTracker* createGeneratorTracker( StringRef generatorName,
SourceLineInfo lineInfo,
GeneratorBasePtr&& generator );
template<typename L>
auto generate( StringRef generatorName, SourceLineInfo const& lineInfo, L const& generatorExpression ) -> typename decltype(generatorExpression())::type {
using UnderlyingType = typename decltype(generatorExpression())::type;
IGeneratorTracker* tracker = acquireGeneratorTracker( generatorName, lineInfo );
// Creation of tracker is delayed after generator creation, so
// that constructing generator can fail without breaking everything.
if (!tracker) {
tracker = createGeneratorTracker(
generatorName,
lineInfo,
Catch::Detail::make_unique<Generators<UnderlyingType>>(
generatorExpression() ) );
}
auto const& generator = static_cast<IGenerator<UnderlyingType> const&>( *tracker->getGenerator() );
return generator.get();
}
} // namespace Generators
} // namespace Catch
#define CATCH_INTERNAL_GENERATOR_STRINGIZE_IMPL( ... ) #__VA_ARGS__##_catch_sr
#define CATCH_INTERNAL_GENERATOR_STRINGIZE(...) CATCH_INTERNAL_GENERATOR_STRINGIZE_IMPL(__VA_ARGS__)
#define GENERATE( ... ) \
Catch::Generators::generate( CATCH_INTERNAL_GENERATOR_STRINGIZE(INTERNAL_CATCH_UNIQUE_NAME(generator)), \
CATCH_INTERNAL_LINEINFO, \
[ ]{ using namespace Catch::Generators; return makeGenerators( __VA_ARGS__ ); } ) //NOLINT(google-build-using-namespace)
#define GENERATE_COPY( ... ) \
Catch::Generators::generate( CATCH_INTERNAL_GENERATOR_STRINGIZE(INTERNAL_CATCH_UNIQUE_NAME(generator)), \
CATCH_INTERNAL_LINEINFO, \
[=]{ using namespace Catch::Generators; return makeGenerators( __VA_ARGS__ ); } ) //NOLINT(google-build-using-namespace)
#define GENERATE_REF( ... ) \
Catch::Generators::generate( CATCH_INTERNAL_GENERATOR_STRINGIZE(INTERNAL_CATCH_UNIQUE_NAME(generator)), \
CATCH_INTERNAL_LINEINFO, \
[&]{ using namespace Catch::Generators; return makeGenerators( __VA_ARGS__ ); } ) //NOLINT(google-build-using-namespace)
#endif // CATCH_GENERATORS_HPP_INCLUDED
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