1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794
/* 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/. */
//! The `ByteString` struct.
use std::borrow::{Borrow, Cow, ToOwned};
use std::default::Default;
use std::hash::{Hash, Hasher};
use std::marker::PhantomData;
use std::ops::{Deref, DerefMut};
use std::str::FromStr;
use std::{fmt, ops, str};
use chrono::prelude::{Utc, Weekday};
use chrono::{Datelike, TimeZone};
use cssparser::CowRcStr;
use html5ever::{LocalName, Namespace};
use lazy_static::lazy_static;
use regex::Regex;
use servo_atoms::Atom;
/// Encapsulates the IDL `ByteString` type.
#[derive(Clone, Debug, Default, Eq, JSTraceable, MallocSizeOf, PartialEq)]
pub struct ByteString(Vec<u8>);
impl ByteString {
/// Creates a new `ByteString`.
pub fn new(value: Vec<u8>) -> ByteString {
ByteString(value)
}
/// Returns `self` as a string, if it encodes valid UTF-8, and `None`
/// otherwise.
pub fn as_str(&self) -> Option<&str> {
str::from_utf8(&self.0).ok()
}
/// Returns the length.
pub fn len(&self) -> usize {
self.0.len()
}
/// Checks if the ByteString is empty.
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
/// Returns `self` with A–Z replaced by a–z.
pub fn to_lower(&self) -> ByteString {
ByteString::new(self.0.to_ascii_lowercase())
}
}
impl From<ByteString> for Vec<u8> {
fn from(byte_string: ByteString) -> Vec<u8> {
byte_string.0
}
}
impl Hash for ByteString {
fn hash<H: Hasher>(&self, state: &mut H) {
self.0.hash(state);
}
}
impl FromStr for ByteString {
type Err = ();
fn from_str(s: &str) -> Result<ByteString, ()> {
Ok(ByteString::new(s.to_owned().into_bytes()))
}
}
impl ops::Deref for ByteString {
type Target = [u8];
fn deref(&self) -> &[u8] {
&self.0
}
}
/// A string that is constructed from a UCS-2 buffer by replacing invalid code
/// points with the replacement character.
#[derive(Clone, Default, Eq, Hash, MallocSizeOf, Ord, PartialEq, PartialOrd)]
pub struct USVString(pub String);
impl Borrow<str> for USVString {
#[inline]
fn borrow(&self) -> &str {
&self.0
}
}
impl Deref for USVString {
type Target = str;
#[inline]
fn deref(&self) -> &str {
&self.0
}
}
impl DerefMut for USVString {
#[inline]
fn deref_mut(&mut self) -> &mut str {
&mut self.0
}
}
impl AsRef<str> for USVString {
fn as_ref(&self) -> &str {
&self.0
}
}
impl fmt::Display for USVString {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&**self, f)
}
}
impl PartialEq<str> for USVString {
fn eq(&self, other: &str) -> bool {
&**self == other
}
}
impl<'a> PartialEq<&'a str> for USVString {
fn eq(&self, other: &&'a str) -> bool {
&**self == *other
}
}
impl From<String> for USVString {
fn from(contents: String) -> USVString {
USVString(contents)
}
}
/// Returns whether `s` is a `token`, as defined by
/// [RFC 2616](http://tools.ietf.org/html/rfc2616#page-17).
pub fn is_token(s: &[u8]) -> bool {
if s.is_empty() {
return false; // A token must be at least a single character
}
s.iter().all(|&x| {
// http://tools.ietf.org/html/rfc2616#section-2.2
match x {
0..=31 | 127 => false, // CTLs
40 | 41 | 60 | 62 | 64 | 44 | 59 | 58 | 92 | 34 | 47 | 91 | 93 | 63 | 61 | 123 |
125 | 32 => false, // separators
x if x > 127 => false, // non-CHARs
_ => true,
}
})
}
/// A DOMString.
///
/// This type corresponds to the [`DOMString`] type in WebIDL.
///
/// [`DOMString`]: https://webidl.spec.whatwg.org/#idl-DOMString
///
/// Conceptually, a DOMString has the same value space as a JavaScript String,
/// i.e., an array of 16-bit *code units* representing UTF-16, potentially with
/// unpaired surrogates present (also sometimes called WTF-16).
///
/// Currently, this type stores a Rust `String`, in order to avoid issues when
/// integrating with the rest of the Rust ecosystem and even the rest of the
/// browser itself.
///
/// However, Rust `String`s are guaranteed to be valid UTF-8, and as such have
/// a *smaller value space* than WTF-16 (i.e., some JavaScript String values
/// can not be represented as a Rust `String`). This introduces the question of
/// what to do with values being passed from JavaScript to Rust that contain
/// unpaired surrogates.
///
/// The hypothesis is that it does not matter much how exactly those values are
/// transformed, because passing unpaired surrogates into the DOM is very rare.
/// In order to test this hypothesis, Servo will panic when encountering any
/// unpaired surrogates on conversion to `DOMString` by default. (The command
/// line option `-Z replace-surrogates` instead causes Servo to replace the
/// unpaired surrogate by a U+FFFD replacement character.)
///
/// Currently, the lack of crash reports about this issue provides some
/// evidence to support the hypothesis. This evidence will hopefully be used to
/// convince other browser vendors that it would be safe to replace unpaired
/// surrogates at the boundary between JavaScript and native code. (This would
/// unify the `DOMString` and `USVString` types, both in the WebIDL standard
/// and in Servo.)
///
/// This type is currently `!Send`, in order to help with an independent
/// experiment to store `JSString`s rather than Rust `String`s.
#[derive(Clone, Debug, Eq, Hash, MallocSizeOf, Ord, PartialEq, PartialOrd)]
pub struct DOMString(String, PhantomData<*const ()>);
impl DOMString {
/// Creates a new `DOMString`.
pub fn new() -> DOMString {
DOMString(String::new(), PhantomData)
}
/// Creates a new `DOMString` from a `String`.
pub fn from_string(s: String) -> DOMString {
DOMString(s, PhantomData)
}
/// Appends a given string slice onto the end of this String.
pub fn push_str(&mut self, string: &str) {
self.0.push_str(string)
}
/// Clears this `DOMString`, removing all contents.
pub fn clear(&mut self) {
self.0.clear()
}
/// Shortens this String to the specified length.
pub fn truncate(&mut self, new_len: usize) {
self.0.truncate(new_len);
}
/// Removes newline characters according to <https://infra.spec.whatwg.org/#strip-newlines>.
pub fn strip_newlines(&mut self) {
self.0.retain(|c| c != '\r' && c != '\n');
}
/// Removes leading and trailing ASCII whitespaces according to
/// <https://infra.spec.whatwg.org/#strip-leading-and-trailing-ascii-whitespace>.
pub fn strip_leading_and_trailing_ascii_whitespace(&mut self) {
if self.0.is_empty() {
return;
}
let trailing_whitespace_len = self
.0
.trim_end_matches(|ref c| char::is_ascii_whitespace(c))
.len();
self.0.truncate(trailing_whitespace_len);
if self.0.is_empty() {
return;
}
let first_non_whitespace = self.0.find(|ref c| !char::is_ascii_whitespace(c)).unwrap();
self.0.replace_range(0..first_non_whitespace, "");
}
/// Validates this `DOMString` is a time string according to
/// <https://html.spec.whatwg.org/multipage/#valid-time-string>.
pub 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
}
}
/// 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>
pub fn is_valid_date_string(&self) -> bool {
self.parse_date_string().is_some()
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-date-string>
pub fn parse_date_string(&self) -> Option<(i32, u32, u32)> {
let value = &self.0;
// Step 1, 2, 3
let (year_int, month_int, day_int) = parse_date_component(value)?;
// Step 4
if value.split('-').nth(3).is_some() {
return None;
}
// Step 5, 6
Some((year_int, month_int, day_int))
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-time-string>
pub fn parse_time_string(&self) -> Option<(u32, u32, f64)> {
let value = &self.0;
// Step 1, 2, 3
let (hour_int, minute_int, second_float) = parse_time_component(value)?;
// Step 4
if value.split(':').nth(3).is_some() {
return None;
}
// Step 5, 6
Some((hour_int, minute_int, second_float))
}
/// 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>
pub fn is_valid_month_string(&self) -> bool {
self.parse_month_string().is_some()
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-month-string>
pub fn parse_month_string(&self) -> Option<(i32, u32)> {
let value = &self;
// Step 1, 2, 3
let (year_int, month_int) = parse_month_component(value)?;
// Step 4
if value.split('-').nth(2).is_some() {
return None;
}
// Step 5
Some((year_int, month_int))
}
/// 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>
pub fn is_valid_week_string(&self) -> bool {
self.parse_week_string().is_some()
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-week-string>
pub fn parse_week_string(&self) -> Option<(i32, u32)> {
let value = &self.0;
// Step 1, 2, 3
let mut iterator = value.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
Some((year_int, week_int))
}
/// <https://html.spec.whatwg.org/multipage/#valid-floating-point-number>
pub fn is_valid_floating_point_number_string(&self) -> bool {
lazy_static! {
static ref RE: Regex =
Regex::new(r"^-?(?:\d+\.\d+|\d+|\.\d+)(?:(e|E)(\+|\-)?\d+)?$").unwrap();
}
RE.is_match(&self.0) && self.parse_floating_point_number().is_some()
}
/// <https://html.spec.whatwg.org/multipage/#rules-for-parsing-floating-point-number-values>
pub fn parse_floating_point_number(&self) -> Option<f64> {
// Steps 15-16 are telling us things about IEEE rounding modes
// for floating-point significands; this code assumes the Rust
// compiler already matches them in any cases where
// that actually matters. They are not
// related to f64::round(), which is for rounding to integers.
let input = &self.0;
if let Ok(val) = input.trim().parse::<f64>() {
if !(
// A valid number is the same as what rust considers to be valid,
// except for +1., NaN, and Infinity.
val.is_infinite() || val.is_nan() || input.ends_with('.') || input.starts_with('+')
) {
return Some(val);
}
}
None
}
/// <https://html.spec.whatwg.org/multipage/#best-representation-of-the-number-as-a-floating-point-number>
pub fn set_best_representation_of_the_floating_point_number(&mut self) {
if let Some(val) = self.parse_floating_point_number() {
self.0 = val.to_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>
pub fn convert_valid_normalized_local_date_and_time_string(&mut self) -> Option<()> {
let ((year, month, day), (hour, minute, second)) =
self.parse_local_date_and_time_string()?;
if second == 0.0 {
self.0 = format!(
"{:04}-{:02}-{:02}T{:02}:{:02}",
year, month, day, hour, minute
);
} else if second < 10.0 {
// we need exactly one leading zero on the seconds,
// whatever their total string length might be
self.0 = format!(
"{:04}-{:02}-{:02}T{:02}:{:02}:0{}",
year, month, day, hour, minute, second
);
} else {
// we need no leading zeroes on the seconds
self.0 = format!(
"{:04}-{:02}-{:02}T{:02}:{:02}:{}",
year, month, day, hour, minute, second
);
}
Some(())
}
/// <https://html.spec.whatwg.org/multipage/#parse-a-local-date-and-time-string>
pub fn parse_local_date_and_time_string(&self) -> Option<((i32, u32, u32), (u32, u32, f64))> {
let value = &self;
// Step 1, 2, 4
let mut iterator = if value.contains('T') {
value.split('T')
} else {
value.split(' ')
};
// Step 3
let date = iterator.next()?;
let date_tuple = parse_date_component(date)?;
// Step 5
let time = iterator.next()?;
let time_tuple = parse_time_component(time)?;
// Step 6
if iterator.next().is_some() {
return None;
}
// Step 7, 8, 9
Some((date_tuple, time_tuple))
}
/// <https://html.spec.whatwg.org/multipage/#valid-e-mail-address>
pub fn is_valid_email_address_string(&self) -> bool {
lazy_static! {
static ref RE: Regex = 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.0)
}
/// <https://html.spec.whatwg.org/multipage/#valid-simple-colour>
pub fn is_valid_simple_color_string(&self) -> bool {
let mut chars = self.0.chars();
if self.0.len() == 7 && chars.next() == Some('#') {
chars.all(|c| c.is_ascii_hexdigit())
} else {
false
}
}
}
impl Borrow<str> for DOMString {
#[inline]
fn borrow(&self) -> &str {
&self.0
}
}
impl Default for DOMString {
fn default() -> Self {
DOMString(String::new(), PhantomData)
}
}
impl Deref for DOMString {
type Target = str;
#[inline]
fn deref(&self) -> &str {
&self.0
}
}
impl DerefMut for DOMString {
#[inline]
fn deref_mut(&mut self) -> &mut str {
&mut self.0
}
}
impl AsRef<str> for DOMString {
fn as_ref(&self) -> &str {
&self.0
}
}
impl fmt::Display for DOMString {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&**self, f)
}
}
impl PartialEq<str> for DOMString {
fn eq(&self, other: &str) -> bool {
&**self == other
}
}
impl<'a> PartialEq<&'a str> for DOMString {
fn eq(&self, other: &&'a str) -> bool {
&**self == *other
}
}
impl From<String> for DOMString {
fn from(contents: String) -> DOMString {
DOMString(contents, PhantomData)
}
}
impl<'a> From<&'a str> for DOMString {
fn from(contents: &str) -> DOMString {
DOMString::from(String::from(contents))
}
}
impl<'a> From<Cow<'a, str>> for DOMString {
fn from(contents: Cow<'a, str>) -> DOMString {
match contents {
Cow::Owned(s) => DOMString::from(s),
Cow::Borrowed(s) => DOMString::from(s),
}
}
}
impl From<DOMString> for LocalName {
fn from(contents: DOMString) -> LocalName {
LocalName::from(contents.0)
}
}
impl From<DOMString> for Namespace {
fn from(contents: DOMString) -> Namespace {
Namespace::from(contents.0)
}
}
impl From<DOMString> for Atom {
fn from(contents: DOMString) -> Atom {
Atom::from(contents.0)
}
}
impl From<DOMString> for String {
fn from(contents: DOMString) -> String {
contents.0
}
}
impl From<DOMString> for Vec<u8> {
fn from(contents: DOMString) -> Vec<u8> {
contents.0.into()
}
}
impl<'a> From<DOMString> for Cow<'a, str> {
fn from(contents: DOMString) -> Cow<'a, str> {
contents.0.into()
}
}
impl<'a> From<DOMString> for CowRcStr<'a> {
fn from(contents: DOMString) -> CowRcStr<'a> {
contents.0.into()
}
}
impl Extend<char> for DOMString {
fn extend<I>(&mut self, iterable: I)
where
I: IntoIterator<Item = char>,
{
self.0.extend(iterable)
}
}
/// <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<(u32, u32, f64)> {
// Step 1
let mut iterator = value.split(':');
let hour = iterator.next()?;
if hour.len() != 2 {
return None;
}
let hour_int = hour.parse::<u32>().ok()?;
// Step 2
if hour_int > 23 {
return None;
}
// Step 3, 4
let minute = iterator.next()?;
if minute.len() != 2 {
return None;
}
let minute_int = minute.parse::<u32>().ok()?;
// Step 5
if minute_int > 59 {
return None;
}
// Step 6, 7
let second_float = match iterator.next() {
Some(second) => {
let mut second_iterator = second.split('.');
if second_iterator.next()?.len() != 2 {
return None;
}
if let Some(second_last) = second_iterator.next() {
if second_last.len() > 3 {
return None;
}
}
second.parse::<f64>().ok()?
},
None => 0.0,
};
// Step 8
Some((hour_int, minute_int, second_float))
}
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>
fn max_week_in_year(year: i32) -> u32 {
Utc.with_ymd_and_hms(year, 1, 1, 0, 0, 0)
.earliest()
.map(|date_time| match date_time.weekday() {
Weekday::Thu => 53,
Weekday::Wed if is_leap_year(year) => 53,
_ => 52,
})
.unwrap_or(52)
}
#[inline]
fn is_leap_year(year: i32) -> bool {
year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)
}