ladybird/Tests/AK/TestGenericLexer.cpp

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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/GenericLexer.h>
#include <AK/StringView.h>
TEST_CASE(should_constexpr_construct_from_empty_string_view)
{
constexpr GenericLexer sut(StringView {});
static_assert(sut.is_eof());
}
TEST_CASE(should_construct_from_string_view)
{
constexpr GenericLexer sut(StringView { "abcdef" });
static_assert(!sut.is_eof());
}
TEST_CASE(should_constexpr_tell)
{
constexpr GenericLexer sut(StringView { "abcdef" });
static_assert(sut.tell() == 0);
}
TEST_CASE(should_constexpr_tell_remaining)
{
constexpr GenericLexer sut(StringView { "abcdef" });
static_assert(sut.tell_remaining() == 6);
}
TEST_CASE(should_constexpr_peek)
{
constexpr GenericLexer sut(StringView { "abcdef" });
static_assert(sut.peek() == 'a');
static_assert(sut.peek(2) == 'c');
static_assert(sut.peek(100) == '\0');
}
TEST_CASE(should_constexpr_next_is)
{
constexpr GenericLexer sut(StringView { "abcdef" });
static_assert(sut.next_is('a'));
static_assert(sut.next_is("abc"));
static_assert(sut.next_is(StringView { "abc" }));
}
TEST_CASE(should_constexpr_retreat)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.consume();
sut.retreat();
return sut;
}();
static_assert(sut.peek() == 'a');
}
TEST_CASE(should_constexpr_consume_1)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.consume();
return sut;
}();
static_assert(sut.peek() == 'b');
}
TEST_CASE(should_constexpr_consume_specific_char)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.consume_specific('a');
return sut;
}();
static_assert(sut.peek() == 'b');
}
TEST_CASE(should_constexpr_consume_specific_string_view)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.consume_specific(StringView { "ab" });
return sut;
}();
static_assert(sut.peek() == 'c');
}
TEST_CASE(should_constexpr_consume_specific_cstring)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.consume_specific("abcd");
return sut;
}();
static_assert(sut.peek() == 'e');
}
TEST_CASE(should_constexpr_ignore_until)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.ignore_until('d');
return sut;
}();
static_assert(sut.peek() == 'e');
}
TEST_CASE(should_constexpr_ignore_until_cstring)
{
constexpr auto sut = [] {
GenericLexer sut(StringView { "abcdef" });
sut.ignore_until("cde");
return sut;
}();
static_assert(sut.peek() == 'f');
}
TEST_CASE(should_constexpr_next_is_pred)
{
constexpr auto pred = [](auto c) {
return c == 'a';
};
constexpr GenericLexer sut(StringView { "abcdef" });
static_assert(sut.next_is(pred));
}
TEST_CASE(should_constexpr_ignore_while_pred)
{
constexpr auto sut = [] {
constexpr auto pred = [](auto c) {
return c == 'a';
};
GenericLexer sut(StringView { "abcdef" });
sut.ignore_while(pred);
return sut;
}();
static_assert(sut.peek() == 'b');
}
TEST_CASE(should_constexpr_ignore_until_pred)
{
constexpr auto sut = [] {
constexpr auto pred = [](auto c) {
return c == 'c';
};
GenericLexer sut(StringView { "abcdef" });
sut.ignore_until(pred);
return sut;
}();
static_assert(sut.peek() == 'c');
}