mirror of
https://github.com/SerenityOS/serenity
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ae3ffdd521
This patch adds the `USING_AK_GLOBALLY` macro which is enabled by default, but can be overridden by build flags. This is a step towards integrating Jakt and AK types.
149 lines
3.1 KiB
C++
149 lines
3.1 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/CharacterTypes.h>
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#include <AK/GenericLexer.h>
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#include <AK/Optional.h>
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namespace AK {
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class DateTimeLexer : public GenericLexer {
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public:
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constexpr explicit DateTimeLexer(StringView input)
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: GenericLexer(input)
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{
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}
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Optional<StringView> consume_year()
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{
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if (tell_remaining() < 4)
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return {};
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for (auto i = 0; i < 4; ++i) {
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if (!is_ascii_digit(peek(i)))
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return {};
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}
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return consume(4);
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}
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Optional<StringView> consume_month()
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{
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if (tell_remaining() < 2)
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return {};
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auto tens = peek();
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if (tens != '0' && tens != '1')
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return {};
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auto ones = peek(1);
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if (!is_ascii_digit(ones))
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return {};
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if (tens == '0') { // 01, 02, 03, 04, 05, 06, 07, 08, 09
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if (ones == '0')
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return {};
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} else if (ones > '2') { // 10, 11, 12
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return {};
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}
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return consume(2);
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}
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Optional<StringView> consume_day()
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{
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if (tell_remaining() < 2)
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return {};
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auto tens = peek();
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if (tens < '0' || tens > '3')
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return {};
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auto ones = peek(1);
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if (!is_ascii_digit(ones))
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return {};
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if (tens == '0') { // 01, 02, 03, 04, 05, 06, 07, 08, 09
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if (ones == '0')
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return {};
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} else if (tens == '3') { // 30, 31
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if (ones != '0' && ones != '1')
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return {};
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} else if (!is_ascii_digit(ones)) { // 10 - 29
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return {};
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}
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return consume(2);
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}
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Optional<StringView> consume_sign()
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{
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if (!tell_remaining())
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return {};
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if (next_is("\xE2\x88\x92"sv))
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return consume(3);
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else if (next_is('-') || next_is('+'))
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return consume(1);
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else
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return {};
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};
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Optional<StringView> consume_hours()
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{
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if (tell_remaining() < 2)
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return {};
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char tens = peek();
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if (tens != '0' && tens != '1' && tens != '2')
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return {};
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char ones = peek(1);
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if (!is_ascii_digit(ones) || (tens == '2' && ones > '3'))
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return {};
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return consume(2);
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}
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Optional<StringView> consume_minutes_or_seconds()
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{
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if (tell_remaining() < 2)
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return {};
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char tens = peek();
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if (tens < '0' || tens > '5')
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return {};
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if (!is_ascii_digit(peek(1)))
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return {};
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return consume(2);
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}
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Optional<StringView> consume_fractional_seconds()
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{
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if (!tell_remaining())
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return {};
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auto length = min(tell_remaining(), 9);
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for (size_t i = 0; i < length; ++i) {
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if (is_ascii_digit(peek(i)))
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continue;
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length = i;
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break;
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}
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return consume(length);
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}
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};
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}
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#if USING_AK_GLOBALLY
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using AK::DateTimeLexer;
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#endif
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