/* * Copyright (c) 2018-2023, Andreas Kling * Copyright (c) 2022, Adam Hodgen * Copyright (c) 2022, Andrew Kaster * Copyright (c) 2023, Shannon Booth * Copyright (c) 2023, stelar7 * * SPDX-License-Identifier: BSD-2-Clause */ #include #include namespace Web::HTML { // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#week-number-of-the-last-day u32 week_number_of_the_last_day(u64 year) { // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#weeks // NOTE: A year is considered to have 53 weeks if either of the following conditions are satisfied: // - January 1 of that year is a Thursday. // - January 1 of that year is a Wednesday and the year is divisible by 400, or divisible by 4, but not 100. // Note: Gauss's algorithm for determining the day of the week with D = 1, and M = 0 // https://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week#Gauss's_algorithm u8 day_of_week = (1 + 5 * ((year - 1) % 4) + 4 * ((year - 1) % 100) + 6 * ((year - 1) % 400)) % 7; if (day_of_week == 4 || (day_of_week == 3 && (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)))) return 53; return 52; } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-week-string bool is_valid_week_string(StringView value) { // A string is a valid week string representing a week-year year and week week if it consists of the following components in the given order: // 1. Four or more ASCII digits, representing year, where year > 0 // 2. A U+002D HYPHEN-MINUS character (-) // 3. A U+0057 LATIN CAPITAL LETTER W character (W) // 4. Two ASCII digits, representing the week week, in the range 1 ≤ week ≤ maxweek, where maxweek is the week number of the last day of week-year year auto parts = value.split_view('-', SplitBehavior::KeepEmpty); if (parts.size() != 2) return false; if (parts[0].length() < 4) return false; for (auto digit : parts[0]) if (!is_ascii_digit(digit)) return false; if (parts[1].length() != 3) return false; if (!parts[1].starts_with('W')) return false; if (!is_ascii_digit(parts[1][1])) return false; if (!is_ascii_digit(parts[1][2])) return false; u64 year = 0; for (auto d : parts[0]) { year *= 10; year += parse_ascii_digit(d); } auto week = (parse_ascii_digit(parts[1][1]) * 10) + parse_ascii_digit(parts[1][2]); return week >= 1 && week <= week_number_of_the_last_day(year); } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-month-string bool is_valid_month_string(StringView value) { // A string is a valid month string representing a year year and month month if it consists of the following components in the given order: // 1. Four or more ASCII digits, representing year, where year > 0 // 2. A U+002D HYPHEN-MINUS character (-) // 3. Two ASCII digits, representing the month month, in the range 1 ≤ month ≤ 12 auto parts = value.split_view('-', SplitBehavior::KeepEmpty); if (parts.size() != 2) return false; if (parts[0].length() < 4) return false; for (auto digit : parts[0]) if (!is_ascii_digit(digit)) return false; if (parts[1].length() != 2) return false; if (!is_ascii_digit(parts[1][0])) return false; if (!is_ascii_digit(parts[1][1])) return false; auto month = (parse_ascii_digit(parts[1][0]) * 10) + parse_ascii_digit(parts[1][1]); return month >= 1 && month <= 12; } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-date-string bool is_valid_date_string(StringView value) { // A string is a valid date string representing a year year, month month, and day day if it consists of the following components in the given order: // 1. A valid month string, representing year and month // 2. A U+002D HYPHEN-MINUS character (-) // 3. Two ASCII digits, representing day, in the range 1 ≤ day ≤ maxday where maxday is the number of days in the month month and year year auto parts = value.split_view('-', SplitBehavior::KeepEmpty); if (parts.size() != 3) return false; if (!is_valid_month_string(ByteString::formatted("{}-{}", parts[0], parts[1]))) return false; if (parts[2].length() != 2) return false; i64 year = 0; for (auto d : parts[0]) { year *= 10; year += parse_ascii_digit(d); } auto month = (parse_ascii_digit(parts[1][0]) * 10) + parse_ascii_digit(parts[1][1]); i64 day = (parse_ascii_digit(parts[2][0]) * 10) + parse_ascii_digit(parts[2][1]); return day >= 1 && day <= AK::days_in_month(year, month); } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#parse-a-date-string WebIDL::ExceptionOr> parse_date_string(JS::Realm& realm, StringView value) { // FIXME: Implement spec compliant date string parsing auto parts = value.split_view('-', SplitBehavior::KeepEmpty); if (parts.size() >= 3) { if (auto year = parts.at(0).to_number(); year.has_value()) { if (auto month = parts.at(1).to_number(); month.has_value()) { if (auto day_of_month = parts.at(2).to_number(); day_of_month.has_value()) return JS::Date::create(realm, JS::make_date(JS::make_day(*year, *month - 1, *day_of_month), 0)); } } } return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Can't parse date string"sv }; } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-local-date-and-time-string bool is_valid_local_date_and_time_string(StringView value) { auto parts_split_by_T = value.split_view('T', SplitBehavior::KeepEmpty); if (parts_split_by_T.size() == 2) return is_valid_date_string(parts_split_by_T[0]) && is_valid_time_string(parts_split_by_T[1]); auto parts_split_by_space = value.split_view(' ', SplitBehavior::KeepEmpty); if (parts_split_by_space.size() == 2) return is_valid_date_string(parts_split_by_space[0]) && is_valid_time_string(parts_split_by_space[1]); return false; } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-normalised-local-date-and-time-string String normalize_local_date_and_time_string(String const& value) { if (auto spaces = value.count(" "sv); spaces > 0) { VERIFY(spaces == 1); return MUST(value.replace(" "sv, "T"sv, ReplaceMode::FirstOnly)); } VERIFY(value.count("T"sv) == 1); return value; } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-time-string bool is_valid_time_string(StringView value) { // A string is a valid time string representing an hour hour, a minute minute, and a second second if it consists of the following components in the given order: // 1. Two ASCII digits, representing hour, in the range 0 ≤ hour ≤ 23 // 2. A U+003A COLON character (:) // 3. Two ASCII digits, representing minute, in the range 0 ≤ minute ≤ 59 // 4. If second is nonzero, or optionally if second is zero: // 1. A U+003A COLON character (:) // 2. Two ASCII digits, representing the integer part of second, in the range 0 ≤ s ≤ 59 // 3. If second is not an integer, or optionally if second is an integer: // 1. A U+002E FULL STOP character (.) // 2. One, two, or three ASCII digits, representing the fractional part of second auto parts = value.split_view(':', SplitBehavior::KeepEmpty); if (parts.size() != 2 && parts.size() != 3) return false; if (parts[0].length() != 2) return false; if (!(is_ascii_digit(parts[0][0]) && is_ascii_digit(parts[0][1]))) return false; auto hour = (parse_ascii_digit(parts[0][0]) * 10) + parse_ascii_digit(parts[0][1]); if (hour > 23) return false; if (parts[1].length() != 2) return false; if (!(is_ascii_digit(parts[1][0]) && is_ascii_digit(parts[1][1]))) return false; auto minute = (parse_ascii_digit(parts[1][0]) * 10) + parse_ascii_digit(parts[1][1]); if (minute > 59) return false; if (parts.size() == 2) return true; if (parts[2].length() < 2) return false; if (!(is_ascii_digit(parts[2][0]) && is_ascii_digit(parts[2][1]))) return false; auto second = (parse_ascii_digit(parts[2][0]) * 10) + parse_ascii_digit(parts[2][1]); if (second > 59) return false; if (parts[2].length() == 2) return true; auto second_parts = parts[2].split_view('.', SplitBehavior::KeepEmpty); if (second_parts.size() != 2) return false; if (second_parts[1].length() < 1 || second_parts[1].length() > 3) return false; for (auto digit : second_parts[1]) if (!is_ascii_digit(digit)) return false; return true; } // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#parse-a-time-string WebIDL::ExceptionOr> parse_time_string(JS::Realm& realm, StringView value) { // FIXME: Implement spec compliant time string parsing auto parts = value.split_view(':', SplitBehavior::KeepEmpty); if (parts.size() >= 2) { if (auto hours = parts.at(0).to_number(); hours.has_value()) { if (auto minutes = parts.at(1).to_number(); minutes.has_value()) { if (parts.size() >= 3) { if (auto seconds = parts.at(2).to_number(); seconds.has_value()) return JS::Date::create(realm, JS::make_time(*hours, *minutes, *seconds, 0)); } return JS::Date::create(realm, JS::make_date(0, JS::make_time(*hours, *minutes, 0, 0))); } } } return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Can't parse time string"sv }; } }