Implement Intl.DateTimeFormat (#4378)

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Closes #4438

This pull request aims to implement `Intl.DateTimeFormat`.

Posting as a draft early as I lost my initial work when my laptop died a
few weeks back 🙃 So better safe then sorry currently.

There's still plenty of work to be done, but feel free to take a look
early 😄

Author: nekevss

Cargo.lock

@@ -146,6 +146,7 @@ icu_provider = { version = "~2.1.1", default-features = false }
 icu_locale = { version = "~2.1.1", default-features = false }
 icu_locale_core = { version = "~2.1.1", default-features = false }
 icu_datetime = { version = "~2.1.1", default-features = false }
+icu_time = { version = "~2.1.1", default-features = false }
 icu_calendar = { version = "~2.1.1", default-features = false }
 icu_collator = { version = "~2.1.1", default-features = false }
 icu_plurals = { version = "~2.1.1", default-features = false }

Cargo.toml

@@ -40,6 +40,7 @@ intl = [
     "icu_normalizer/serde",
     "dep:icu_locale",
     "dep:icu_datetime",
+    "dep:icu_time",
     "dep:icu_plurals",
     "dep:icu_provider",
     "dep:icu_calendar",
@@ -54,6 +55,8 @@ intl = [
     "dep:zerofrom",
     "dep:fixed_decimal",
     "dep:tinystr",
+    "dep:timezone_provider",
+    "timezone_provider/tzif",
 ]
 
 fuzz = ["boa_ast/arbitrary", "boa_interner/arbitrary"]
@@ -144,6 +147,9 @@ icu_locale = { workspace = true, default-features = false, features = [
 icu_datetime = { workspace = true, default-features = false, features = [
     "serde",
 ], optional = true }
+icu_time = { workspace = true, default-features = false, features = [
+    "serde",
+], optional = true }
 icu_calendar = { workspace = true, default-features = false, optional = true }
 icu_collator = { workspace = true, default-features = false, features = [
     "serde",

core/engine/Cargo.toml

@@ -130,7 +130,7 @@ fn time_from_year(y: f64) -> f64 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-yearfromtime
-pub(super) fn year_from_time(t: f64) -> i32 {
+pub(crate) fn year_from_time(t: f64) -> i32 {
     const MS_PER_AVERAGE_YEAR: f64 = 12.0 * 30.436_875 * MS_PER_DAY;
 
     // 1. Return the largest integral Number y (closest to +∞) such that TimeFromYear(y) ≤ t.
@@ -169,7 +169,7 @@ fn in_leap_year(t: f64) -> u16 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-monthfromtime
-pub(super) fn month_from_time(t: f64) -> u8 {
+pub(crate) fn month_from_time(t: f64) -> u8 {
     // 1. Let inLeapYear be InLeapYear(t).
     let in_leap_year = in_leap_year(t);
 
@@ -211,7 +211,7 @@ pub(super) fn month_from_time(t: f64) -> u8 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-datefromtime
-pub(super) fn date_from_time(t: f64) -> u8 {
+pub(crate) fn date_from_time(t: f64) -> u8 {
     // 1. Let inLeapYear be InLeapYear(t).
     let in_leap_year = in_leap_year(t);
 
@@ -268,7 +268,7 @@ pub(super) fn week_day(t: f64) -> u8 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-hourfromtime
-pub(super) fn hour_from_time(t: f64) -> u8 {
+pub(crate) fn hour_from_time(t: f64) -> u8 {
     // 1. Return 𝔽(floor(ℝ(t / msPerHour)) modulo HoursPerDay).
     ((t / MS_PER_HOUR).floor()).rem_euclid(HOURS_PER_DAY) as u8
 }
@@ -279,7 +279,7 @@ pub(super) fn hour_from_time(t: f64) -> u8 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-minfromtime
-pub(super) fn min_from_time(t: f64) -> u8 {
+pub(crate) fn min_from_time(t: f64) -> u8 {
     // 1. Return 𝔽(floor(ℝ(t / msPerMinute)) modulo MinutesPerHour).
     ((t / MS_PER_MINUTE).floor()).rem_euclid(MINUTES_PER_HOUR) as u8
 }
@@ -290,7 +290,7 @@ pub(super) fn min_from_time(t: f64) -> u8 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-secfromtime
-pub(super) fn sec_from_time(t: f64) -> u8 {
+pub(crate) fn sec_from_time(t: f64) -> u8 {
     // 1. Return 𝔽(floor(ℝ(t / msPerSecond)) modulo SecondsPerMinute).
     ((t / MS_PER_SECOND).floor()).rem_euclid(SECONDS_PER_MINUTE) as u8
 }
@@ -301,7 +301,7 @@ pub(super) fn sec_from_time(t: f64) -> u8 {
 /// - [ECMAScript reference][spec]
 ///
 /// [spec]: https://tc39.es/ecma262/#sec-msfromtime
-pub(super) fn ms_from_time(t: f64) -> u16 {
+pub(crate) fn ms_from_time(t: f64) -> u16 {
     // 1. Return 𝔽(ℝ(t) modulo ℝ(msPerSecond)).
     t.rem_euclid(MS_PER_SECOND) as u16
 }