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use ecow::EcoString;
use krilla::metadata::{Metadata, TextDirection};
use typst_library::foundations::{Datetime, Smart};
use typst_library::layout::Dir;
use typst_library::text::Lang;
use crate::convert::GlobalContext;
pub(crate) fn build_metadata(gc: &GlobalContext) -> Metadata {
let creator = format!("Typst {}", env!("CARGO_PKG_VERSION"));
let lang = gc.languages.iter().max_by_key(|(_, &count)| count).map(|(&l, _)| l);
let dir = if lang.map(Lang::dir) == Some(Dir::RTL) {
TextDirection::RightToLeft
} else {
TextDirection::LeftToRight
};
let mut metadata = Metadata::new()
.creator(creator)
.keywords(gc.document.info.keywords.iter().map(EcoString::to_string).collect())
.authors(gc.document.info.author.iter().map(EcoString::to_string).collect());
let lang = gc.languages.iter().max_by_key(|(_, &count)| count).map(|(&l, _)| l);
if let Some(lang) = lang {
metadata = metadata.language(lang.as_str().to_string());
}
if let Some(title) = &gc.document.info.title {
metadata = metadata.title(title.to_string());
}
if let Some(subject) = &gc.document.info.description {
metadata = metadata.subject(subject.to_string());
}
if let Some(ident) = gc.options.ident.custom() {
metadata = metadata.document_id(ident.to_string());
}
// (1) If the `document.date` is set to specific `datetime` or `none`, use it.
// (2) If the `document.date` is set to `auto` or not set, try to use the
// date from the options.
// (3) Otherwise, we don't write date metadata.
let (date, tz) = match (gc.document.info.date, gc.options.timestamp) {
(Smart::Custom(date), _) => (date, None),
(Smart::Auto, Some(timestamp)) => {
(Some(timestamp.datetime), Some(timestamp.timezone))
}
_ => (None, None),
};
if let Some(date) = date.and_then(|d| convert_date(d, tz)) {
metadata = metadata.creation_date(date);
}
metadata = metadata.text_direction(dir);
metadata
}
fn convert_date(
datetime: Datetime,
tz: Option<Timezone>,
) -> Option<krilla::metadata::DateTime> {
let year = datetime.year().filter(|&y| y >= 0)? as u16;
let mut kd = krilla::metadata::DateTime::new(year);
if let Some(month) = datetime.month() {
kd = kd.month(month);
}
if let Some(day) = datetime.day() {
kd = kd.day(day);
}
if let Some(h) = datetime.hour() {
kd = kd.hour(h);
}
if let Some(m) = datetime.minute() {
kd = kd.minute(m);
}
if let Some(s) = datetime.second() {
kd = kd.second(s);
}
match tz {
Some(Timezone::UTC) => kd = kd.utc_offset_hour(0).utc_offset_minute(0),
Some(Timezone::Local { hour_offset, minute_offset }) => {
kd = kd.utc_offset_hour(hour_offset).utc_offset_minute(minute_offset)
}
None => {}
}
Some(kd)
}
/// A timestamp with timezone information.
#[derive(Debug, Clone, Copy)]
pub struct Timestamp {
/// The datetime of the timestamp.
pub(crate) datetime: Datetime,
/// The timezone of the timestamp.
pub(crate) timezone: Timezone,
}
impl Timestamp {
/// Create a new timestamp with a given datetime and UTC suffix.
pub fn new_utc(datetime: Datetime) -> Self {
Self { datetime, timezone: Timezone::UTC }
}
/// Create a new timestamp with a given datetime, and a local timezone offset.
pub fn new_local(datetime: Datetime, whole_minute_offset: i32) -> Option<Self> {
let hour_offset = (whole_minute_offset / 60).try_into().ok()?;
// Note: the `%` operator in Rust is the remainder operator, not the
// modulo operator. The remainder operator can return negative results.
// We can simply apply `abs` here because we assume the `minute_offset`
// will have the same sign as `hour_offset`.
let minute_offset = (whole_minute_offset % 60).abs().try_into().ok()?;
match (hour_offset, minute_offset) {
// Only accept valid timezone offsets with `-23 <= hours <= 23`,
// and `0 <= minutes <= 59`.
(-23..=23, 0..=59) => Some(Self {
datetime,
timezone: Timezone::Local { hour_offset, minute_offset },
}),
_ => None,
}
}
}
/// A timezone.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Timezone {
/// The UTC timezone.
UTC,
/// The local timezone offset from UTC. And the `minute_offset` will have
/// same sign as `hour_offset`.
Local { hour_offset: i8, minute_offset: u8 },
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_timestamp_new_local() {
let dummy_datetime = Datetime::from_ymd_hms(2024, 12, 17, 10, 10, 10).unwrap();
let test = |whole_minute_offset, expect_timezone| {
assert_eq!(
Timestamp::new_local(dummy_datetime, whole_minute_offset)
.unwrap()
.timezone,
expect_timezone
);
};
// Valid timezone offsets
test(0, Timezone::Local { hour_offset: 0, minute_offset: 0 });
test(480, Timezone::Local { hour_offset: 8, minute_offset: 0 });
test(-480, Timezone::Local { hour_offset: -8, minute_offset: 0 });
test(330, Timezone::Local { hour_offset: 5, minute_offset: 30 });
test(-210, Timezone::Local { hour_offset: -3, minute_offset: 30 });
test(-720, Timezone::Local { hour_offset: -12, minute_offset: 0 }); // AoE
// Corner cases
test(315, Timezone::Local { hour_offset: 5, minute_offset: 15 });
test(-225, Timezone::Local { hour_offset: -3, minute_offset: 45 });
test(1439, Timezone::Local { hour_offset: 23, minute_offset: 59 });
test(-1439, Timezone::Local { hour_offset: -23, minute_offset: 59 });
// Invalid timezone offsets
assert!(Timestamp::new_local(dummy_datetime, 1440).is_none());
assert!(Timestamp::new_local(dummy_datetime, -1440).is_none());
assert!(Timestamp::new_local(dummy_datetime, i32::MAX).is_none());
assert!(Timestamp::new_local(dummy_datetime, i32::MIN).is_none());
}
}
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