[WIP] Add DateTimeFormat

Cargo.toml

@@ -10,4 +10,5 @@ members = [
     "components/locale",
     "components/num-util",
     "components/pluralrules",
+    "components/datetime",
 ]

components/datetime/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "icu-datetime"
+description = "API for managing Unicode Language and Locale Identifiers"
+version = "0.0.1"
+authors = ["The ICU4X Project Developers"]
+edition = "2018"
+readme = "README.md"
+repository = "https://github.com/unicode-org/icu4x"
+license-file = "../../LICENSE"
+categories = ["internationalization"]
+include = [
+    "src/**/*",
+    "Cargo.toml",
+    "README.md"
+]
+
+[dependencies]
+
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "datetime"
+harness = false

components/datetime/benches/datetime.rs

@@ -0,0 +1,196 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::fmt::Write;
+
+use icu_datetime::date::DateTime;
+use icu_datetime::options::{self, DateTimeFormatOptions};
+use icu_datetime::provider::DummyDataProvider;
+use icu_datetime::DateTimeFormat;
+
+fn datetime_benches(c: &mut Criterion) {
+    let datetimes = vec![
+        DateTime::new(2001, 9, 8, 18, 46, 40),
+        DateTime::new(2017, 7, 13, 19, 40, 0),
+        DateTime::new(2020, 9, 13, 5, 26, 40),
+        DateTime::new(2021, 1, 6, 22, 13, 20),
+        DateTime::new(2021, 5, 2, 17, 0, 0),
+        DateTime::new(2021, 8, 26, 10, 46, 40),
+        DateTime::new(2021, 12, 20, 3, 33, 20),
+        DateTime::new(2022, 4, 14, 22, 20, 0),
+        DateTime::new(2022, 8, 8, 16, 6, 40),
+        DateTime::new(2033, 5, 17, 20, 33, 20),
+    ];
+    let values = &[
+        ("pl", options::style::Date::Full, options::style::Time::None),
+        ("pl", options::style::Date::Long, options::style::Time::None),
+        (
+            "pl",
+            options::style::Date::Medium,
+            options::style::Time::None,
+        ),
+        (
+            "pl",
+            options::style::Date::Short,
+            options::style::Time::None,
+        ),
+        ("pl", options::style::Date::None, options::style::Time::Full),
+        ("pl", options::style::Date::None, options::style::Time::Long),
+        (
+            "pl",
+            options::style::Date::None,
+            options::style::Time::Medium,
+        ),
+        (
+            "pl",
+            options::style::Date::None,
+            options::style::Time::Short,
+        ),
+        ("pl", options::style::Date::Full, options::style::Time::Full),
+        ("pl", options::style::Date::Long, options::style::Time::Long),
+        (
+            "pl",
+            options::style::Date::Medium,
+            options::style::Time::Medium,
+        ),
+        (
+            "pl",
+            options::style::Date::Short,
+            options::style::Time::Short,
+        ),
+    ];
+    let components = vec![
+        options::components::Bag {
+            year: options::components::Numeric::TwoDigit,
+            month: options::components::Month::Long,
+            day: options::components::Numeric::TwoDigit,
+            ..Default::default()
+        },
+        options::components::Bag {
+            hour: options::components::Numeric::TwoDigit,
+            minute: options::components::Numeric::Numeric,
+            second: options::components::Numeric::Numeric,
+            hour_cycle: options::components::HourCycle::H23,
+            ..Default::default()
+        },
+        options::components::Bag {
+            year: options::components::Numeric::Numeric,
+            month: options::components::Month::Short,
+            day: options::components::Numeric::Numeric,
+            weekday: options::components::Text::Long,
+            era: options::components::Text::Long,
+            hour: options::components::Numeric::Numeric,
+            minute: options::components::Numeric::TwoDigit,
+            second: options::components::Numeric::TwoDigit,
+            hour_cycle: options::components::HourCycle::H12,
+            time_zone_name: options::components::TimeZoneName::Long,
+            ..Default::default()
+        },
+        options::components::Bag {
+            hour: options::components::Numeric::Numeric,
+            minute: options::components::Numeric::TwoDigit,
+            ..Default::default()
+        },
+        options::components::Bag {
+            minute: options::components::Numeric::TwoDigit,
+            second: options::components::Numeric::TwoDigit,
+            ..Default::default()
+        },
+    ];
+
+    let mut results = vec![];
+
+    for _ in 0..datetimes.len() {
+        results.push(String::new());
+    }
+
+    let dp = DummyDataProvider::default();
+
+    {
+        let mut group = c.benchmark_group("datetime");
+
+        group.bench_function("DateTimeFormat/format_to_write", |b| {
+            b.iter(|| {
+                for value in values {
+                    let options = DateTimeFormatOptions::Style(options::style::Bag {
+                        date: value.1,
+                        time: value.2,
+                        ..Default::default()
+                    });
+                    let dtf = DateTimeFormat::try_new(&dp, &options);
+
+                    for (dt, result) in datetimes.iter().zip(results.iter_mut()) {
+                        result.clear();
+                        let _ = dtf.format_to_write(&dt, result);
+                    }
+                }
+            })
+        });
+
+        group.bench_function("DateTimeFormat/format_to_string", |b| {
+            b.iter(|| {
+                for value in values {
+                    let options = DateTimeFormatOptions::Style(options::style::Bag {
+                        date: value.1,
+                        time: value.2,
+                        ..Default::default()
+                    });
+                    let dtf = DateTimeFormat::try_new(&dp, &options);
+
+                    for dt in &datetimes {
+                        let _ = dtf.format_to_string(&dt);
+                    }
+                }
+            })
+        });
+
+        group.bench_function("FormattedDateTime/format", |b| {
+            b.iter(|| {
+                for value in values {
+                    let options = DateTimeFormatOptions::Style(options::style::Bag {
+                        date: value.1,
+                        time: value.2,
+                        ..Default::default()
+                    });
+                    let dtf = DateTimeFormat::try_new(&dp, &options);
+
+                    for (dt, result) in datetimes.iter().zip(results.iter_mut()) {
+                        result.clear();
+                        let fdt = dtf.format(&dt);
+                        write!(result, "{}", fdt).unwrap();
+                    }
+                }
+            })
+        });
+
+        group.bench_function("FormattedDateTime/to_string", |b| {
+            b.iter(|| {
+                for value in values {
+                    let options = DateTimeFormatOptions::Style(options::style::Bag {
+                        date: value.1,
+                        time: value.2,
+                        ..Default::default()
+                    });
+                    let dtf = DateTimeFormat::try_new(&dp, &options);
+
+                    for dt in &datetimes {
+                        let fdt = dtf.format(&dt);
+                        let _ = fdt.to_string();
+                    }
+                }
+            })
+        });
+
+        group.bench_function("options/write_skeleton", |b| {
+            b.iter(|| {
+                for component in &components {
+                    let mut s = String::new();
+                    component.write_skeleton(&mut s).unwrap();
+                }
+            })
+        });
+
+        group.finish();
+    }
+}
+
+criterion_group!(benches, datetime_benches,);
+criterion_main!(benches);

components/datetime/src/date.rs

@@ -0,0 +1,29 @@
+#[derive(Default)]
+pub struct DateTime {
+    pub year: usize,
+    pub month: usize,
+    pub day: usize,
+    pub hour: usize,
+    pub minute: usize,
+    pub second: usize,
+}
+
+impl DateTime {
+    pub fn new(
+        year: usize,
+        month: usize,
+        day: usize,
+        hour: usize,
+        minute: usize,
+        second: usize,
+    ) -> Self {
+        Self {
+            year,
+            month,
+            day,
+            hour,
+            minute,
+            second,
+        }
+    }
+}

components/datetime/src/fields.rs

@@ -0,0 +1,141 @@
+use std::fmt;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub enum FieldLength {
+    Short = 1,
+    TwoDigit = 2,
+    Abbreviated = 3,
+    Wide = 4,
+    Narrow = 5,
+}
+
+#[derive(Debug, PartialEq)]
+pub enum FieldSymbol {
+    Era,
+    Year(Year),
+    Month(Month),
+    Day(Day),
+    Hour(Hour),
+}
+
+impl FieldSymbol {
+    pub fn write(&self, w: &mut impl fmt::Write) -> fmt::Result {
+        match self {
+            Self::Era => w.write_char('G'),
+            Self::Year(year) => year.write(w),
+            Self::Month(month) => month.write(w),
+            Self::Day(day) => day.write(w),
+            Self::Hour(hour) => hour.write(w),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub enum FieldType {
+    Era,
+    Year,
+    Month,
+    Day,
+    Hour,
+}
+
+impl FieldType {
+    pub fn iter() -> impl Iterator<Item = &'static Self> {
+        [Self::Era, Self::Year, Self::Month, Self::Day].iter()
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Year {
+    Calendar,
+    WeekOf,
+    Extended,
+    Cyclic,
+    RelatedGregorian,
+}
+
+impl Year {
+    pub fn write(&self, w: &mut impl fmt::Write) -> fmt::Result {
+        w.write_char(match self {
+            Self::Calendar => 'y',
+            Self::WeekOf => 'Y',
+            Self::Extended => 'u',
+            Self::Cyclic => 'U',
+            Self::RelatedGregorian => 'r',
+        })
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Month {
+    Format,
+    StandAlone,
+}
+
+impl Month {
+    pub fn write(&self, w: &mut impl fmt::Write) -> fmt::Result {
+        w.write_char(match self {
+            Self::Format => 'M',
+            Self::StandAlone => 'L',
+        })
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Day {
+    DayOfMonth,
+    DayOfYear,
+    DayOfWeekInMonth,
+    ModifiedJulianDay,
+}
+
+impl Day {
+    pub fn write(&self, w: &mut impl fmt::Write) -> fmt::Result {
+        w.write_char(match self {
+            Self::DayOfMonth => 'd',
+            Self::DayOfYear => 'D',
+            Self::DayOfWeekInMonth => 'F',
+            Self::ModifiedJulianDay => 'g',
+        })
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Hour {
+    H11,
+    H12,
+    H23,
+    H24,
+    Preferred,
+    PreferredNoDayPeriod,
+    PreferredFlexibleDayPeriod,
+}
+
+impl Hour {
+    pub fn write(&self, w: &mut impl fmt::Write) -> fmt::Result {
+        w.write_char(match self {
+            Self::H11 => 'K',
+            Self::H12 => 'h',
+            Self::H23 => 'H',
+            Self::H24 => 'k',
+            Self::Preferred => 'j',
+            Self::PreferredNoDayPeriod => 'J',
+            Self::PreferredFlexibleDayPeriod => 'C',
+        })
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub struct Field {
+    pub symbol: FieldSymbol,
+    pub length: FieldLength,
+}
+
+impl Field {
+    pub fn write_pattern(&self, w: &mut impl fmt::Write) -> fmt::Result {
+        for _ in 0..(self.length as u8) {
+            self.symbol.write(w)?;
+        }
+        Ok(())
+    }
+}