588dae8aa6
This is a normative change in the Temporal spec. See: https://github.com/tc39/proposal-temporal/commit/160e836
225 lines
8.2 KiB
C++
225 lines
8.2 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@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/GenericLexer.h>
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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namespace JS::Temporal {
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struct Annotation {
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bool critical { false };
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StringView key;
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StringView value;
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};
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struct ParseResult {
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Optional<StringView> sign;
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Optional<StringView> date_year;
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Optional<StringView> date_month;
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Optional<StringView> date_day;
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Optional<StringView> time_hour;
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Optional<StringView> time_minute;
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Optional<StringView> time_second;
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Optional<StringView> time_fraction;
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Optional<StringView> utc_designator;
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Optional<StringView> time_zone_annotation;
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Optional<StringView> time_zone_numeric_utc_offset;
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Optional<StringView> time_zone_utc_offset_sign;
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Optional<StringView> time_zone_utc_offset_hour;
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Optional<StringView> time_zone_utc_offset_minute;
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Optional<StringView> time_zone_utc_offset_second;
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Optional<StringView> time_zone_utc_offset_fraction;
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Optional<StringView> time_zone_identifier;
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Optional<StringView> duration_years;
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Optional<StringView> duration_months;
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Optional<StringView> duration_weeks;
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Optional<StringView> duration_days;
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Optional<StringView> duration_whole_hours;
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Optional<StringView> duration_hours_fraction;
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Optional<StringView> duration_whole_minutes;
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Optional<StringView> duration_minutes_fraction;
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Optional<StringView> duration_whole_seconds;
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Optional<StringView> duration_seconds_fraction;
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Optional<StringView> annotation_key;
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Optional<StringView> annotation_value;
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Vector<Annotation> annotations;
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};
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enum class Production {
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TemporalInstantString,
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TemporalDateTimeString,
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TemporalDurationString,
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TemporalMonthDayString,
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TemporalTimeString,
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TemporalYearMonthString,
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TemporalZonedDateTimeString,
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TimeZoneIdentifier,
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TimeZoneNumericUTCOffset,
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AnnotationValue,
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DateMonth,
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};
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Optional<ParseResult> parse_iso8601(Production, StringView);
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namespace Detail {
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// 13.33 ISO 8601 grammar, https://tc39.es/proposal-temporal/#sec-temporal-iso8601grammar
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class ISO8601Parser {
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public:
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explicit ISO8601Parser(StringView input)
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: m_input(input)
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, m_state({
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.lexer = GenericLexer { input },
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.parse_result = {},
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})
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{
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}
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[[nodiscard]] GenericLexer const& lexer() const { return m_state.lexer; }
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[[nodiscard]] ParseResult const& parse_result() const { return m_state.parse_result; }
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[[nodiscard]] bool parse_decimal_digits();
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[[nodiscard]] bool parse_decimal_digit();
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[[nodiscard]] bool parse_non_zero_digit();
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[[nodiscard]] bool parse_ascii_sign();
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[[nodiscard]] bool parse_sign();
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[[nodiscard]] bool parse_unpadded_hour();
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[[nodiscard]] bool parse_hour();
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[[nodiscard]] bool parse_minute_second();
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[[nodiscard]] bool parse_decimal_separator();
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[[nodiscard]] bool parse_days_designator();
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[[nodiscard]] bool parse_hours_designator();
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[[nodiscard]] bool parse_minutes_designator();
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[[nodiscard]] bool parse_months_designator();
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[[nodiscard]] bool parse_duration_designator();
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[[nodiscard]] bool parse_seconds_designator();
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[[nodiscard]] bool parse_date_time_separator();
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[[nodiscard]] bool parse_time_designator();
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[[nodiscard]] bool parse_weeks_designator();
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[[nodiscard]] bool parse_years_designator();
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[[nodiscard]] bool parse_utc_designator();
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[[nodiscard]] bool parse_annotation_critical_flag();
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[[nodiscard]] bool parse_date_year();
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[[nodiscard]] bool parse_date_month();
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[[nodiscard]] bool parse_date_month_with_thirty_days();
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[[nodiscard]] bool parse_date_day();
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[[nodiscard]] bool parse_date_spec_year_month();
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[[nodiscard]] bool parse_date_spec_month_day();
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[[nodiscard]] bool parse_valid_month_day();
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[[nodiscard]] bool parse_date();
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[[nodiscard]] bool parse_time_hour();
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[[nodiscard]] bool parse_time_minute();
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[[nodiscard]] bool parse_time_second();
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[[nodiscard]] bool parse_fractional_part();
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[[nodiscard]] bool parse_fraction();
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[[nodiscard]] bool parse_time_fraction();
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[[nodiscard]] bool parse_time_zone_utc_offset_sign();
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[[nodiscard]] bool parse_time_zone_utc_offset_hour();
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[[nodiscard]] bool parse_time_zone_utc_offset_minute();
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[[nodiscard]] bool parse_time_zone_utc_offset_second();
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[[nodiscard]] bool parse_time_zone_utc_offset_fractional_part();
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[[nodiscard]] bool parse_time_zone_utc_offset_fraction();
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[[nodiscard]] bool parse_time_zone_numeric_utc_offset();
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[[nodiscard]] bool parse_time_zone_utc_offset();
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[[nodiscard]] bool parse_time_zone_utc_offset_name();
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[[nodiscard]] bool parse_tz_leading_char();
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[[nodiscard]] bool parse_tz_char();
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[[nodiscard]] bool parse_time_zone_iana_component();
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[[nodiscard]] bool parse_time_zone_iana_name_tail();
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[[nodiscard]] bool parse_time_zone_iana_legacy_name();
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[[nodiscard]] bool parse_time_zone_iana_name();
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[[nodiscard]] bool parse_time_zone_identifier();
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[[nodiscard]] bool parse_time_zone_annotation();
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[[nodiscard]] bool parse_a_key_leading_char();
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[[nodiscard]] bool parse_a_key_char();
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[[nodiscard]] bool parse_a_val_char();
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[[nodiscard]] bool parse_annotation_key_tail();
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[[nodiscard]] bool parse_annotation_key();
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[[nodiscard]] bool parse_annotation_value_component();
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[[nodiscard]] bool parse_annotation_value_tail();
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[[nodiscard]] bool parse_annotation_value();
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[[nodiscard]] bool parse_annotation();
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[[nodiscard]] bool parse_annotations();
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[[nodiscard]] bool parse_time_spec();
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[[nodiscard]] bool parse_time_spec_with_optional_offset_not_ambiguous();
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[[nodiscard]] bool parse_date_time();
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[[nodiscard]] bool parse_annotated_time();
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[[nodiscard]] bool parse_annotated_date_time();
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[[nodiscard]] bool parse_annotated_date_time_time_required();
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[[nodiscard]] bool parse_annotated_year_month();
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[[nodiscard]] bool parse_annotated_month_day();
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[[nodiscard]] bool parse_duration_whole_seconds();
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[[nodiscard]] bool parse_duration_seconds_fraction();
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[[nodiscard]] bool parse_duration_seconds_part();
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[[nodiscard]] bool parse_duration_whole_minutes();
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[[nodiscard]] bool parse_duration_minutes_fraction();
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[[nodiscard]] bool parse_duration_minutes_part();
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[[nodiscard]] bool parse_duration_whole_hours();
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[[nodiscard]] bool parse_duration_hours_fraction();
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[[nodiscard]] bool parse_duration_hours_part();
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[[nodiscard]] bool parse_duration_time();
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[[nodiscard]] bool parse_duration_days();
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[[nodiscard]] bool parse_duration_days_part();
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[[nodiscard]] bool parse_duration_weeks();
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[[nodiscard]] bool parse_duration_weeks_part();
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[[nodiscard]] bool parse_duration_months();
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[[nodiscard]] bool parse_duration_months_part();
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[[nodiscard]] bool parse_duration_years();
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[[nodiscard]] bool parse_duration_years_part();
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[[nodiscard]] bool parse_duration_date();
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[[nodiscard]] bool parse_duration();
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[[nodiscard]] bool parse_temporal_instant_string();
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[[nodiscard]] bool parse_temporal_date_time_string();
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[[nodiscard]] bool parse_temporal_duration_string();
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[[nodiscard]] bool parse_temporal_month_day_string();
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[[nodiscard]] bool parse_temporal_time_string();
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[[nodiscard]] bool parse_temporal_year_month_string();
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[[nodiscard]] bool parse_temporal_zoned_date_time_string();
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private:
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struct State {
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GenericLexer lexer;
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ParseResult parse_result;
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};
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struct StateTransaction {
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explicit StateTransaction(ISO8601Parser& parser)
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: m_parser(parser)
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, m_saved_state(parser.m_state)
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, m_start_index(parser.m_state.lexer.tell())
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{
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}
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~StateTransaction()
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{
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if (!m_commit)
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m_parser.m_state = move(m_saved_state);
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}
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void commit() { m_commit = true; }
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StringView parsed_string_view() const
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{
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return m_parser.m_input.substring_view(m_start_index, m_parser.m_state.lexer.tell() - m_start_index);
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}
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private:
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ISO8601Parser& m_parser;
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State m_saved_state;
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size_t m_start_index { 0 };
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bool m_commit { false };
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};
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StringView m_input;
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State m_state;
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};
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}
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}
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