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#include <catch2/catch_test_macros.hpp>
#include <string_view>
#include <variant>
#include <vector>
import ttwhy.scanners;
using namespace std::string_view_literals;
[[nodiscard]] constexpr auto static is_character(ttwhy::scanners::input_event & event, char expected) -> bool
{
auto const * data = std::get_if<ttwhy::scanners::character_event>(&event);
return data != nullptr && data->value == expected;
}
[[nodiscard]] constexpr auto static is_control(ttwhy::scanners::input_event & event,
ttwhy::scanners::control_key expected) -> bool
{
auto const * data = std::get_if<ttwhy::scanners::control_event>(&event);
return data != nullptr && data->key == expected;
}
SCENARIO("The ANSI scanner processes printable ASCII and standard C0 control characters", "[scanner][ansi]")
{
GIVEN("An initialized scanner and event sink")
{
auto queue = std::vector<ttwhy::scanners::input_event>{};
auto sink = [&queue](auto const & event) {
queue.push_back(event);
};
auto scanner = ttwhy::scanners::ansi{sink};
WHEN("Processing a standard printable character")
{
scanner.process("A"sv);
THEN("It yields a single character event")
{
REQUIRE(queue.size() == 1);
CHECK(is_character(queue.at(0), 'A'));
}
}
WHEN("Processing a BS byte (\\x08)")
{
scanner.process("\x08"sv);
THEN("It yields a backspace control event")
{
REQUIRE(queue.size() == 1);
CHECK(is_control(queue.at(0), ttwhy::scanners::control_key::backspace));
}
}
WHEN("Processing a DEL byte (\\x7f as BS)")
{
scanner.process("\x7f"sv);
THEN("It yields a backspace control event")
{
REQUIRE(queue.size() == 1);
CHECK(is_control(queue.at(0), ttwhy::scanners::control_key::backspace));
}
}
WHEN("Processing a TAB byte")
{
scanner.process("\x09"sv);
THEN("It yields a tab control event")
{
REQUIRE(queue.size() == 1);
CHECK(is_control(queue.at(0), ttwhy::scanners::control_key::tab));
}
}
WHEN("Processing an LF byte")
{
scanner.process("\x0a"sv);
THEN("It yields an enter control event")
{
REQUIRE(queue.size() == 1);
CHECK(is_control(queue.at(0), ttwhy::scanners::control_key::enter));
}
}
WHEN("Processing an CR byte")
{
scanner.process("\x0d"sv);
THEN("It yields an enter control event")
{
REQUIRE(queue.size() == 1);
CHECK(is_control(queue.at(0), ttwhy::scanners::control_key::enter));
}
}
}
}
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