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254 lines
8.3 KiB
C++
254 lines
8.3 KiB
C++
/*
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* Created by Phil Nash on 15/6/2018.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_GENERATORS_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_GENERATORS_HPP_INCLUDED
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#include "catch_interfaces_generatortracker.h"
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#include "catch_common.h"
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#include "catch_enforce.h"
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#include <memory>
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#include <vector>
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#include <cassert>
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#include <utility>
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namespace Catch {
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namespace Generators {
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// !TBD move this into its own location?
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namespace pf{
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template<typename T, typename... Args>
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std::unique_ptr<T> make_unique( Args&&... args ) {
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return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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}
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template<typename T>
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struct IGenerator {
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virtual ~IGenerator() {}
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virtual auto get( size_t index ) const -> T = 0;
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};
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template<typename T>
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class SingleValueGenerator : public IGenerator<T> {
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T m_value;
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public:
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SingleValueGenerator( T const& value ) : m_value( value ) {}
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auto get( size_t ) const -> T override {
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return m_value;
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}
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};
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template<typename T>
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class FixedValuesGenerator : public IGenerator<T> {
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std::vector<T> m_values;
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public:
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FixedValuesGenerator( std::initializer_list<T> values ) : m_values( values ) {}
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auto get( size_t index ) const -> T override {
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return m_values[index];
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}
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};
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template<typename T>
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class RangeGenerator : public IGenerator<T> {
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T const m_first;
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T const m_last;
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public:
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RangeGenerator( T const& first, T const& last ) : m_first( first ), m_last( last ) {
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assert( m_last > m_first );
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}
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auto get( size_t index ) const -> T override {
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// ToDo:: introduce a safe cast to catch potential overflows
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return static_cast<T>(m_first+index);
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}
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};
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template<typename T>
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struct NullGenerator : IGenerator<T> {
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auto get( size_t ) const -> T override {
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CATCH_INTERNAL_ERROR("A Null Generator is always empty");
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}
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};
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template<typename T>
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class Generator {
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std::unique_ptr<IGenerator<T>> m_generator;
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size_t m_size;
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public:
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Generator( size_t size, std::unique_ptr<IGenerator<T>> generator )
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: m_generator( std::move( generator ) ),
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m_size( size )
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{}
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auto size() const -> size_t { return m_size; }
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auto operator[]( size_t index ) const -> T {
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assert( index < m_size );
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return m_generator->get( index );
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}
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};
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std::vector<size_t> randomiseIndices( size_t selectionSize, size_t sourceSize );
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template<typename T>
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class GeneratorRandomiser : public IGenerator<T> {
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Generator<T> m_baseGenerator;
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std::vector<size_t> m_indices;
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public:
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GeneratorRandomiser( Generator<T>&& baseGenerator, size_t numberOfItems )
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: m_baseGenerator( std::move( baseGenerator ) ),
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m_indices( randomiseIndices( numberOfItems, m_baseGenerator.size() ) )
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{}
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auto get( size_t index ) const -> T override {
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return m_baseGenerator[m_indices[index]];
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}
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};
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template<typename T>
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struct RequiresASpecialisationFor;
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template<typename T>
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auto all() -> Generator<T> { return RequiresASpecialisationFor<T>(); }
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template<>
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auto all<int>() -> Generator<int>;
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template<typename T>
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auto range( T const& first, T const& last ) -> Generator<T> {
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return Generator<T>( (last-first), pf::make_unique<RangeGenerator<T>>( first, last ) );
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}
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template<typename T>
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auto random( T const& first, T const& last ) -> Generator<T> {
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auto gen = range( first, last );
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auto size = gen.size();
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return Generator<T>( size, pf::make_unique<GeneratorRandomiser<T>>( std::move( gen ), size ) );
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}
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template<typename T>
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auto random( size_t size ) -> Generator<T> {
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return Generator<T>( size, pf::make_unique<GeneratorRandomiser<T>>( all<T>(), size ) );
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}
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template<typename T>
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auto values( std::initializer_list<T> values ) -> Generator<T> {
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return Generator<T>( values.size(), pf::make_unique<FixedValuesGenerator<T>>( values ) );
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}
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template<typename T>
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auto value( T const& val ) -> Generator<T> {
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return Generator<T>( 1, pf::make_unique<SingleValueGenerator<T>>( val ) );
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}
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template<typename T>
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auto as() -> Generator<T> {
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return Generator<T>( 0, pf::make_unique<NullGenerator<T>>() );
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}
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template<typename... Ts>
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auto table( std::initializer_list<std::tuple<Ts...>>&& tuples ) -> Generator<std::tuple<Ts...>> {
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return values<std::tuple<Ts...>>( std::forward<std::initializer_list<std::tuple<Ts...>>>( tuples ) );
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}
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template<typename T>
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struct Generators : GeneratorBase {
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std::vector<Generator<T>> m_generators;
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using type = T;
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Generators() : GeneratorBase( 0 ) {}
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void populate( T&& val ) {
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m_size += 1;
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m_generators.emplace_back( value( std::move( val ) ) );
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}
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template<typename U>
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void populate( U&& val ) {
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populate( T( std::move( val ) ) );
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}
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void populate( Generator<T>&& generator ) {
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m_size += generator.size();
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m_generators.emplace_back( std::move( generator ) );
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}
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template<typename U, typename... Gs>
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void populate( U&& valueOrGenerator, Gs... moreGenerators ) {
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populate( std::forward<U>( valueOrGenerator ) );
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populate( std::forward<Gs>( moreGenerators )... );
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}
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auto operator[]( size_t index ) const -> T {
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size_t sizes = 0;
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for( auto const& gen : m_generators ) {
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auto localIndex = index-sizes;
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sizes += gen.size();
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if( index < sizes )
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return gen[localIndex];
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}
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CATCH_INTERNAL_ERROR("Index '" << index << "' is out of range (" << sizes << ')');
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}
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};
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template<typename T, typename... Gs>
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auto makeGenerators( Generator<T>&& generator, Gs... moreGenerators ) -> Generators<T> {
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Generators<T> generators;
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generators.m_generators.reserve( 1+sizeof...(Gs) );
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generators.populate( std::move( generator ), std::forward<Gs>( moreGenerators )... );
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return generators;
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}
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template<typename T>
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auto makeGenerators( Generator<T>&& generator ) -> Generators<T> {
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Generators<T> generators;
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generators.populate( std::move( generator ) );
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return generators;
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}
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template<typename T, typename... Gs>
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auto makeGenerators( T&& val, Gs... moreGenerators ) -> Generators<T> {
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return makeGenerators( value( std::forward<T>( val ) ), std::forward<Gs>( moreGenerators )... );
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}
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template<typename T, typename U, typename... Gs>
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auto makeGenerators( U&& val, Gs... moreGenerators ) -> Generators<T> {
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return makeGenerators( value( T( std::forward<U>( val ) ) ), std::forward<Gs>( moreGenerators )... );
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}
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auto acquireGeneratorTracker( SourceLineInfo const& lineInfo ) -> IGeneratorTracker&;
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template<typename L>
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// Note: The type after -> is weird, because VS2015 cannot parse
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// the expression used in the typedef inside, when it is in
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// return type. Yeah, ¯\_(ツ)_/¯
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auto generate( SourceLineInfo const& lineInfo, L const& generatorExpression ) -> decltype(std::declval<decltype(generatorExpression())>()[0]) {
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using UnderlyingType = typename decltype(generatorExpression())::type;
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IGeneratorTracker& tracker = acquireGeneratorTracker( lineInfo );
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if( !tracker.hasGenerator() )
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tracker.setGenerator( pf::make_unique<Generators<UnderlyingType>>( generatorExpression() ) );
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auto const& generator = static_cast<Generators<UnderlyingType> const&>( *tracker.getGenerator() );
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return generator[tracker.getIndex()];
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}
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} // namespace Generators
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} // namespace Catch
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#define GENERATE( ... ) \
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Catch::Generators::generate( CATCH_INTERNAL_LINEINFO, []{ using namespace Catch::Generators; return makeGenerators( __VA_ARGS__ ); } )
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#endif // TWOBLUECUBES_CATCH_GENERATORS_HPP_INCLUDED
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