script/dom/bindings/str.rs
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::sync::LazyLock;
use num_traits::Zero;
use regex::Regex;
pub use script_bindings::str::*;
use time::{Date, Month, OffsetDateTime, Time, Weekday};
/// <https://html.spec.whatwg.org/multipage/#parse-a-month-component>
fn parse_month_component(value: &str) -> Option<(i32, u32)> {
// Step 3
let mut iterator = value.split('-');
let year = iterator.next()?;
let month = iterator.next()?;
// Step 1, 2
let year_int = year.parse::<i32>().ok()?;
if year.len() < 4 || year_int == 0 {
return None;
}
// Step 4, 5
let month_int = month.parse::<u32>().ok()?;
if month.len() != 2 || !(1..=12).contains(&month_int) {
return None;
}
// Step 6
Some((year_int, month_int))
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-date-component>
fn parse_date_component(value: &str) -> Option<(i32, u32, u32)> {
// Step 1
let (year_int, month_int) = parse_month_component(value)?;
// Step 3, 4
let day = value.split('-').nth(2)?;
let day_int = day.parse::<u32>().ok()?;
if day.len() != 2 {
return None;
}
// Step 2, 5
let max_day = max_day_in_month(year_int, month_int)?;
if day_int == 0 || day_int > max_day {
return None;
}
// Step 6
Some((year_int, month_int, day_int))
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-time-component>
fn parse_time_component(value: &str) -> Option<(u8, u8, u8, u16)> {
// Step 1: Collect a sequence of code points that are ASCII digits from input given
// position. If the collected sequence is not exactly two characters long, then fail.
// Otherwise, interpret the resulting sequence as a base-ten integer. Let that number
// be the hour.
let mut iterator = value.split(':');
let hour = iterator.next()?;
if hour.len() != 2 {
return None;
}
// Step 2: If hour is not a number in the range 0 ≤ hour ≤ 23, then fail.
let hour_int = hour.parse::<u8>().ok()?;
if hour_int > 23 {
return None;
}
// Step 3: If position is beyond the end of input or if the character at position is
// not a U+003A COLON character, then fail. Otherwise, move position forwards one
// character.
// Step 4: Collect a sequence of code points that are ASCII digits from input given
// position. If the collected sequence is not exactly two characters long, then fail.
// Otherwise, interpret the resulting sequence as a base-ten integer. Let that number
// be the minute.
// Step 5: If minute is not a number in the range 0 ≤ minute ≤ 59, then fail.
let minute = iterator.next()?;
if minute.len() != 2 {
return None;
}
let minute_int = minute.parse::<u8>().ok()?;
if minute_int > 59 {
return None;
}
// Step 6, 7: Asks us to parse the seconds as a floating point number, but below this
// is done as integral parts in order to avoid floating point precision issues.
let Some(seconds_and_milliseconds) = iterator.next() else {
return Some((hour_int, minute_int, 0, 0));
};
// Parse the seconds portion.
let mut second_iterator = seconds_and_milliseconds.split('.');
let second = second_iterator.next()?;
if second.len() != 2 {
return None;
}
let second_int = second.parse::<u8>().ok()?;
// Parse the milliseconds portion as a u16 (milliseconds can be up to 1000) and
// make sure that it has the proper value based on how long the string is.
let Some(millisecond) = second_iterator.next() else {
return Some((hour_int, minute_int, second_int, 0));
};
let millisecond_length = millisecond.len() as u32;
if millisecond_length > 3 {
return None;
}
let millisecond_int = millisecond.parse::<u16>().ok()?;
let millisecond_int = millisecond_int * 10_u16.pow(3 - millisecond_length);
// Step 8: Return hour, minute, and second (and in our case the milliseconds due to the note
// above about floating point precision).
Some((hour_int, minute_int, second_int, millisecond_int))
}
fn max_day_in_month(year_num: i32, month_num: u32) -> Option<u32> {
match month_num {
1 | 3 | 5 | 7 | 8 | 10 | 12 => Some(31),
4 | 6 | 9 | 11 => Some(30),
2 => {
if is_leap_year(year_num) {
Some(29)
} else {
Some(28)
}
},
_ => None,
}
}
/// <https://html.spec.whatwg.org/multipage/#week-number-of-the-last-day>
///
/// > A week-year with a number year has 53 weeks if it corresponds to either a year year
/// > in the proleptic Gregorian calendar that has a Thursday as its first day (January
/// > 1st), or a year year in the proleptic Gregorian calendar that has a Wednesday as its
/// > first day (January 1st) and where year is a number divisible by 400, or a number
/// > divisible by 4 but not by 100. All other week-years have 52 weeks.
fn max_week_in_year(year: i32) -> u32 {
let Ok(date) = Date::from_calendar_date(year, Month::January, 1) else {
return 52;
};
match OffsetDateTime::new_utc(date, Time::MIDNIGHT).weekday() {
Weekday::Thursday => 53,
Weekday::Wednesday if is_leap_year(year) => 53,
_ => 52,
}
}
#[inline]
fn is_leap_year(year: i32) -> bool {
year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)
}
pub(crate) trait ToInputValueString {
fn to_date_string(&self) -> String;
fn to_month_string(&self) -> String;
fn to_week_string(&self) -> String;
fn to_time_string(&self) -> String;
/// A valid normalized local date and time string should be "{date}T{time}"
/// where date and time are both valid, and the time string must be as short as possible
/// <https://html.spec.whatwg.org/multipage/#valid-normalised-local-date-and-time-string>
fn to_local_date_time_string(&self) -> String;
}
impl ToInputValueString for OffsetDateTime {
fn to_date_string(&self) -> String {
format!(
"{:04}-{:02}-{:02}",
self.year(),
self.month() as u8,
self.day()
)
}
fn to_month_string(&self) -> String {
format!("{:04}-{:02}", self.year(), self.month() as u8)
}
fn to_week_string(&self) -> String {
// NB: The ISO week year might be different than the year of the day.
let (year, week, _) = self.to_iso_week_date();
format!("{:04}-W{:02}", year, week)
}
fn to_time_string(&self) -> String {
if self.second().is_zero() && self.millisecond().is_zero() {
format!("{:02}:{:02}", self.hour(), self.minute())
} else {
// This needs to trim off the zero parts of the milliseconds.
format!(
"{:02}:{:02}:{:02}.{:03}",
self.hour(),
self.minute(),
self.second(),
self.millisecond()
)
.trim_end_matches(['.', '0'])
.to_owned()
}
}
fn to_local_date_time_string(&self) -> String {
format!("{}T{}", self.to_date_string(), self.to_time_string())
}
}
pub(crate) trait FromInputValueString {
/// <https://html.spec.whatwg.org/multipage/#parse-a-date-string>
///
/// Parse the date string and return an [`OffsetDateTime`] on midnight of the
/// given date in UTC.
///
/// A valid date string should be "YYYY-MM-DD"
/// YYYY must be four or more digits, MM and DD both must be two digits
/// <https://html.spec.whatwg.org/multipage/#valid-date-string>
fn parse_date_string(&self) -> Option<OffsetDateTime>;
/// <https://html.spec.whatwg.org/multipage/#parse-a-month-string>
///
/// Parse the month and return an [`OffsetDateTime`] on midnight of UTC of the morning of
/// the first day of the parsed month.
///
/// A valid month string should be "YYYY-MM" YYYY must be four or more digits, MM both
/// must be two digits <https://html.spec.whatwg.org/multipage/#valid-month-string>
fn parse_month_string(&self) -> Option<OffsetDateTime>;
/// <https://html.spec.whatwg.org/multipage/#parse-a-week-string>
///
/// Parse the week string, returning an [`OffsetDateTime`] on the Monday of the parsed
/// week.
///
/// A valid week string should be like {YYYY}-W{WW}, such as "2017-W52" YYYY must be
/// four or more digits, WW both must be two digits
/// <https://html.spec.whatwg.org/multipage/#valid-week-string>
fn parse_week_string(&self) -> Option<OffsetDateTime>;
/// Parse this value as a time string according to
/// <https://html.spec.whatwg.org/multipage/#valid-time-string>.
fn parse_time_string(&self) -> Option<OffsetDateTime>;
/// <https://html.spec.whatwg.org/multipage/#parse-a-local-date-and-time-string>
///
/// Parse the local date and time, returning an [`OffsetDateTime`] in UTC or None.
fn parse_local_date_time_string(&self) -> Option<OffsetDateTime>;
/// Validates whether or not this value is a valid date string according to
/// <https://html.spec.whatwg.org/multipage/#valid-date-string>.
fn is_valid_date_string(&self) -> bool {
self.parse_date_string().is_some()
}
/// Validates whether or not this value is a valid month string according to
/// <https://html.spec.whatwg.org/multipage/#valid-month-string>.
fn is_valid_month_string(&self) -> bool {
self.parse_month_string().is_some()
}
/// Validates whether or not this value is a valid week string according to
/// <https://html.spec.whatwg.org/multipage/#valid-week-string>.
fn is_valid_week_string(&self) -> bool {
self.parse_week_string().is_some()
}
/// Validates whether or not this value is a valid time string according to
/// <https://html.spec.whatwg.org/multipage/#valid-time-string>.
fn is_valid_time_string(&self) -> bool;
/// Validates whether or not this value is a valid local date time string according to
/// <https://html.spec.whatwg.org/multipage/#valid-week-string>.
fn is_valid_local_date_time_string(&self) -> bool {
self.parse_local_date_time_string().is_some()
}
/// <https://html.spec.whatwg.org/multipage/#valid-simple-colour>
fn is_valid_simple_color_string(&self) -> bool;
/// <https://html.spec.whatwg.org/multipage/#valid-e-mail-address>
fn is_valid_email_address_string(&self) -> bool;
}
impl FromInputValueString for &str {
fn parse_date_string(&self) -> Option<OffsetDateTime> {
// Step 1, 2, 3
let (year_int, month_int, day_int) = parse_date_component(self)?;
// Step 4
if self.split('-').nth(3).is_some() {
return None;
}
// Step 5, 6
let month = (month_int as u8).try_into().ok()?;
let date = Date::from_calendar_date(year_int, month, day_int as u8).ok()?;
Some(OffsetDateTime::new_utc(date, Time::MIDNIGHT))
}
fn parse_month_string(&self) -> Option<OffsetDateTime> {
// Step 1, 2, 3
let (year_int, month_int) = parse_month_component(self)?;
// Step 4
if self.split('-').nth(2).is_some() {
return None;
}
// Step 5
let month = (month_int as u8).try_into().ok()?;
let date = Date::from_calendar_date(year_int, month, 1).ok()?;
Some(OffsetDateTime::new_utc(date, Time::MIDNIGHT))
}
fn parse_week_string(&self) -> Option<OffsetDateTime> {
// Step 1, 2, 3
let mut iterator = self.split('-');
let year = iterator.next()?;
// Step 4
let year_int = year.parse::<i32>().ok()?;
if year.len() < 4 || year_int == 0 {
return None;
}
// Step 5, 6
let week = iterator.next()?;
let (week_first, week_last) = week.split_at(1);
if week_first != "W" {
return None;
}
// Step 7
let week_int = week_last.parse::<u32>().ok()?;
if week_last.len() != 2 {
return None;
}
// Step 8
let max_week = max_week_in_year(year_int);
// Step 9
if week_int < 1 || week_int > max_week {
return None;
}
// Step 10
if iterator.next().is_some() {
return None;
}
// Step 11
let date = Date::from_iso_week_date(year_int, week_int as u8, Weekday::Monday).ok()?;
Some(OffsetDateTime::new_utc(date, Time::MIDNIGHT))
}
fn parse_time_string(&self) -> Option<OffsetDateTime> {
// Step 1, 2, 3
let (hour, minute, second, millisecond) = parse_time_component(self)?;
// Step 4
if self.split(':').nth(3).is_some() {
return None;
}
// Step 5, 6
let time = Time::from_hms_milli(hour, minute, second, millisecond).ok()?;
Some(OffsetDateTime::new_utc(
OffsetDateTime::UNIX_EPOCH.date(),
time,
))
}
fn parse_local_date_time_string(&self) -> Option<OffsetDateTime> {
// Step 1, 2, 4
let mut iterator = if self.contains('T') {
self.split('T')
} else {
self.split(' ')
};
// Step 3
let date = iterator.next()?;
let (year, month, day) = parse_date_component(date)?;
// Step 5
let time = iterator.next()?;
let (hour, minute, second, millisecond) = parse_time_component(time)?;
// Step 6
if iterator.next().is_some() {
return None;
}
// Step 7, 8, 9
// TODO: Is this supposed to know the locale's daylight-savings-time rules?
let month = (month as u8).try_into().ok()?;
let date = Date::from_calendar_date(year, month, day as u8).ok()?;
let time = Time::from_hms_milli(hour, minute, second, millisecond).ok()?;
Some(OffsetDateTime::new_utc(date, time))
}
fn is_valid_time_string(&self) -> bool {
enum State {
HourHigh,
HourLow09,
HourLow03,
MinuteColon,
MinuteHigh,
MinuteLow,
SecondColon,
SecondHigh,
SecondLow,
MilliStop,
MilliHigh,
MilliMiddle,
MilliLow,
Done,
Error,
}
let next_state = |valid: bool, next: State| -> State {
if valid {
next
} else {
State::Error
}
};
let state = self.chars().fold(State::HourHigh, |state, c| {
match state {
// Step 1 "HH"
State::HourHigh => match c {
'0' | '1' => State::HourLow09,
'2' => State::HourLow03,
_ => State::Error,
},
State::HourLow09 => next_state(c.is_ascii_digit(), State::MinuteColon),
State::HourLow03 => next_state(c.is_digit(4), State::MinuteColon),
// Step 2 ":"
State::MinuteColon => next_state(c == ':', State::MinuteHigh),
// Step 3 "mm"
State::MinuteHigh => next_state(c.is_digit(6), State::MinuteLow),
State::MinuteLow => next_state(c.is_ascii_digit(), State::SecondColon),
// Step 4.1 ":"
State::SecondColon => next_state(c == ':', State::SecondHigh),
// Step 4.2 "ss"
State::SecondHigh => next_state(c.is_digit(6), State::SecondLow),
State::SecondLow => next_state(c.is_ascii_digit(), State::MilliStop),
// Step 4.3.1 "."
State::MilliStop => next_state(c == '.', State::MilliHigh),
// Step 4.3.2 "SSS"
State::MilliHigh => next_state(c.is_ascii_digit(), State::MilliMiddle),
State::MilliMiddle => next_state(c.is_ascii_digit(), State::MilliLow),
State::MilliLow => next_state(c.is_ascii_digit(), State::Done),
_ => State::Error,
}
});
match state {
State::Done |
// Step 4 (optional)
State::SecondColon |
// Step 4.3 (optional)
State::MilliStop |
// Step 4.3.2 (only 1 digit required)
State::MilliMiddle | State::MilliLow => true,
_ => false
}
}
fn is_valid_simple_color_string(&self) -> bool {
let mut chars = self.chars();
if self.len() == 7 && chars.next() == Some('#') {
chars.all(|c| c.is_ascii_hexdigit())
} else {
false
}
}
fn is_valid_email_address_string(&self) -> bool {
static RE: LazyLock<Regex> = LazyLock::new(|| {
Regex::new(concat!(
r"^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?",
r"(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$"
))
.unwrap()
});
RE.is_match(self)
}
}