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use std::fmt;
use std::fmt::{Debug, Formatter};
use std::hash::Hash;
use ecow::{eco_format, EcoString, EcoVec};
use time::error::{Format, InvalidFormatDescription};
use time::{format_description, PrimitiveDateTime};
use crate::eval::cast;
use crate::util::pretty_array_like;
/// A datetime object that represents either a date, a time or a combination of
/// both.
#[derive(Clone, Copy, PartialEq, Hash)]
pub enum Datetime {
/// Representation as a date.
Date(time::Date),
/// Representation as a time.
Time(time::Time),
/// Representation as a combination of date and time.
Datetime(time::PrimitiveDateTime),
}
impl Datetime {
/// Display the date and/or time in a certain format.
pub fn display(&self, pattern: Option<EcoString>) -> Result<EcoString, EcoString> {
let pattern = pattern.as_ref().map(EcoString::as_str).unwrap_or(match self {
Datetime::Date(_) => "[year]-[month]-[day]",
Datetime::Time(_) => "[hour]:[minute]:[second]",
Datetime::Datetime(_) => "[year]-[month]-[day] [hour]:[minute]:[second]",
});
let format = format_description::parse(pattern)
.map_err(format_time_invalid_format_description_error)?;
let formatted_result = match self {
Datetime::Date(date) => date.format(&format),
Datetime::Time(time) => time.format(&format),
Datetime::Datetime(datetime) => datetime.format(&format),
}
.map(EcoString::from);
formatted_result.map_err(format_time_format_error)
}
/// Return the year of the datetime, if existing.
pub fn year(&self) -> Option<i32> {
match self {
Datetime::Date(date) => Some(date.year()),
Datetime::Time(_) => None,
Datetime::Datetime(datetime) => Some(datetime.year()),
}
}
/// Return the month of the datetime, if existing.
pub fn month(&self) -> Option<u8> {
match self {
Datetime::Date(date) => Some(date.month().into()),
Datetime::Time(_) => None,
Datetime::Datetime(datetime) => Some(datetime.month().into()),
}
}
/// Return the weekday of the datetime, if existing.
pub fn weekday(&self) -> Option<u8> {
match self {
Datetime::Date(date) => Some(date.weekday().number_from_monday()),
Datetime::Time(_) => None,
Datetime::Datetime(datetime) => Some(datetime.weekday().number_from_monday()),
}
}
/// Return the day of the datetime, if existing.
pub fn day(&self) -> Option<u8> {
match self {
Datetime::Date(date) => Some(date.day()),
Datetime::Time(_) => None,
Datetime::Datetime(datetime) => Some(datetime.day()),
}
}
/// Return the hour of the datetime, if existing.
pub fn hour(&self) -> Option<u8> {
match self {
Datetime::Date(_) => None,
Datetime::Time(time) => Some(time.hour()),
Datetime::Datetime(datetime) => Some(datetime.hour()),
}
}
/// Return the minute of the datetime, if existing.
pub fn minute(&self) -> Option<u8> {
match self {
Datetime::Date(_) => None,
Datetime::Time(time) => Some(time.minute()),
Datetime::Datetime(datetime) => Some(datetime.minute()),
}
}
/// Return the second of the datetime, if existing.
pub fn second(&self) -> Option<u8> {
match self {
Datetime::Date(_) => None,
Datetime::Time(time) => Some(time.second()),
Datetime::Datetime(datetime) => Some(datetime.second()),
}
}
/// Create a datetime from year, month, and day.
pub fn from_ymd(year: i32, month: u8, day: u8) -> Option<Self> {
Some(Datetime::Date(
time::Date::from_calendar_date(year, time::Month::try_from(month).ok()?, day)
.ok()?,
))
}
/// Create a datetime from hour, minute, and second.
pub fn from_hms(hour: u8, minute: u8, second: u8) -> Option<Self> {
Some(Datetime::Time(time::Time::from_hms(hour, minute, second).ok()?))
}
/// Create a datetime from day and time.
pub fn from_ymd_hms(
year: i32,
month: u8,
day: u8,
hour: u8,
minute: u8,
second: u8,
) -> Option<Self> {
let date =
time::Date::from_calendar_date(year, time::Month::try_from(month).ok()?, day)
.ok()?;
let time = time::Time::from_hms(hour, minute, second).ok()?;
Some(Datetime::Datetime(PrimitiveDateTime::new(date, time)))
}
}
impl Debug for Datetime {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let year = self.year().map(|y| eco_format!("year: {y}"));
let month = self.month().map(|m| eco_format!("month: {m}"));
let day = self.day().map(|d| eco_format!("day: {d}"));
let hour = self.hour().map(|h| eco_format!("hour: {h}"));
let minute = self.minute().map(|m| eco_format!("minute: {m}"));
let second = self.second().map(|s| eco_format!("second: {s}"));
let filtered = [year, month, day, hour, minute, second]
.into_iter()
.flatten()
.collect::<EcoVec<_>>();
write!(f, "datetime{}", &pretty_array_like(&filtered, false))
}
}
cast! {
type Datetime: "datetime",
}
/// Format the `Format` error of the time crate in an appropriate way.
fn format_time_format_error(error: Format) -> EcoString {
match error {
Format::InvalidComponent(name) => eco_format!("invalid component '{}'", name),
_ => "failed to format datetime in the requested format".into(),
}
}
/// Format the `InvalidFormatDescription` error of the time crate in an
/// appropriate way.
fn format_time_invalid_format_description_error(
error: InvalidFormatDescription,
) -> EcoString {
match error {
InvalidFormatDescription::UnclosedOpeningBracket { index, .. } => {
eco_format!("missing closing bracket for bracket at index {}", index)
}
InvalidFormatDescription::InvalidComponentName { name, index, .. } => {
eco_format!("invalid component name '{}' at index {}", name, index)
}
InvalidFormatDescription::InvalidModifier { value, index, .. } => {
eco_format!("invalid modifier '{}' at index {}", value, index)
}
InvalidFormatDescription::Expected { what, index, .. } => {
eco_format!("expected {} at index {}", what, index)
}
InvalidFormatDescription::MissingComponentName { index, .. } => {
eco_format!("expected component name at index {}", index)
}
InvalidFormatDescription::MissingRequiredModifier { name, index, .. } => {
eco_format!(
"missing required modifier {} for component at index {}",
name,
index
)
}
InvalidFormatDescription::NotSupported { context, what, index, .. } => {
eco_format!("{} is not supported in {} at index {}", what, context, index)
}
_ => "failed to parse datetime format".into(),
}
}
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