#include "catch.hpp"

#include "escape_newline.hh"

TEST_CASE("escape_newline")

{

	SECTION("round trip") {

		auto test = [](std::string_view s) {

			auto e = escape_newline::encode(s);

			auto d = escape_newline::decode(e);

			CHECK(e.size() >= d.size());

			CHECK(d == s);

			escape_newline::decode_inplace(e);

			CHECK(e == s);

		};

		test("");

		test("bla");

		test("bla\nbla");

		test("bla\\bla");

		test("\n\n\\\\");

	}

	SECTION("errors") {

		// * All inputs are valid for encode().

		// * But some inputs should normally never be passed to decode()

		//   (as in: they can never have been the result of a prior

		//   encode()).

		//   Nevertheless we try to recover from such inputs.

		// Single backslash at the end -> gets dropped.

		CHECK(escape_newline::decode("bla\\") == "bla");

		std::string s = "bla\\";

		escape_newline::decode_inplace(s);

		CHECK(s == "bla");

		// Normally only "\\" or "\n" should occur, all other "\<x>" are

		// in principle invalid, but we decode them as 'x'

		CHECK(escape_newline::decode("bl\\a") == "bla");

	}

}