Alepha/IOStreams/Filter.test/0.cc

static_assert( __cplusplus > 2020'99 );

#include "../Filter.h"

#include <Alepha/Testing/test.h>
#include <Alepha/Testing/TableTest.h>

#include <sstream>
#include <iostream>

static auto init= Alepha::Utility::enroll <=[]
{
	using namespace std::literals::string_literals;
	using namespace Alepha::Testing::literals;

	using namespace Alepha::Testing::exports;

	[]( const std::string &s )
	{
		std::stringstream iss{ s };

		//iss >> Filter{ std::make_unique< CapitalizationFilter >() };

		std::string rv;
		iss << "bob";
		int x;
		iss >> x;
	};

	"Simple Filter"_test <=TableTest
	<
		[]( const std::string &s )
				-> std::string
		{
			using namespace Alepha::IOStreams::exports::Filter_m;
			struct CapitalizationFilter : StreamFilter
			{
				public:
					Emitter
					nextChar( const char ch ) override
					{
						struct EmitterImpl
							: public Emitter::Impl
						{
							char ch;
							bool read= false;

							explicit EmitterImpl( const char ch ) : ch( ch ) {}

							bool empty() const final { return read; }
							char
							next() final
							{
								read= true;
								std::cerr << "Emitted `" << ch << "`" << std::endl;
								return ch;
							}
						};

						std::cerr << "Emitter built for `" << ch << "`" << std::endl;
						return Emitter{ std::make_unique< EmitterImpl >( ::toupper( ch ) ) };
					}
			};

			std::ostringstream oss;

			oss << Filter{ std::make_unique< CapitalizationFilter >() };

			oss << s;

			oss << Alepha::IOStreams::PopStack{};

			return oss.str();
		}
	>
	::Cases
	{
		{ "Hello", { "hello" }, "HELLO" },
	};

	auto streamWriter= []( const std::string &s )
	{
		using namespace Alepha::IOStreams::exports::Filter_m;
		struct CapitalizationFilter : StreamFilter
		{
			public:
				Emitter
				nextChar( const char ch ) override
				{
					struct EmitterImpl
						: public Emitter::Impl
					{
						char ch;
						bool read= false;

						explicit EmitterImpl( const char ch ) : ch( ch ) {}

						bool empty() const final { return read; }
						char
						next() final
						{
							read= true;
							std::cerr << "Emitted `" << ch << "`" << std::endl;
							return ch;
						}
					};
					std::cerr << "Emitter built for `" << ch << "`" << std::endl;
					return Emitter{ std::make_unique< EmitterImpl >( ::toupper( ch ) ) };
				}
		};

		std::stringstream iss{ s };

		iss >> Filter{ std::make_unique< CapitalizationFilter >() };

		std::string rv;
		iss >> rv;

		iss >> Alepha::IOStreams::PopStack{};

		return rv;
	};

	"Simple Input Filter"_test <=TableTest< streamWriter >::Cases
	{
		{ "Hello", { "hello" }, "HELLO" },
	};
};