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use chrono::{DateTime, Duration, TimeZone, UTC};
use std::fmt;
use std::str::FromStr;
use {Error, Result};
/// A UTC timestamp. Used for serialization to and from the plist date type.
#[derive(Clone, Debug, PartialEq)]
pub struct Date {
inner: DateTime<UTC>,
}
impl Date {
#[doc(hidden)]
pub fn from_seconds_since_plist_epoch(timestamp: f64) -> Result<Date> {
// Seconds since 1/1/2001 00:00:00.
let millis = timestamp * 1_000.0;
// Chrono's Duration can only millisecond values between ::std::i64::MIN and
// ::std::i64::MAX.
if millis > ::std::i64::MAX as f64 || millis < ::std::i64::MIN as f64 {
return Err(Error::InvalidData);
}
let whole_millis = millis.floor();
let submilli_nanos = ((millis - whole_millis) * 1_000_000.0).floor();
let dur = Duration::milliseconds(whole_millis as i64);
let dur = dur + Duration::nanoseconds(submilli_nanos as i64);
let plist_epoch = UTC.ymd(2001, 1, 1).and_hms(0, 0, 0);
let date = plist_epoch.checked_add_signed(dur).ok_or(Error::InvalidData)?;
Ok(Date { inner: date })
}
}
impl From<DateTime<UTC>> for Date {
fn from(date: DateTime<UTC>) -> Self {
Date { inner: date }
}
}
impl Into<DateTime<UTC>> for Date {
fn into(self) -> DateTime<UTC> {
self.inner
}
}
impl fmt::Display for Date {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.inner)
}
}
impl FromStr for Date {
type Err = ();
fn from_str(s: &str) -> ::std::result::Result<Self, Self::Err> {
let date = DateTime::parse_from_rfc3339(&s).map_err(|_| ())?;
Ok(Date { inner: date.with_timezone(&UTC) })
}
}
#[cfg(feature = "serde")]
pub mod serde_impls {
use serde_base::de::{Deserialize, Deserializer, Error, Visitor, Unexpected};
use serde_base::ser::{Serialize, Serializer};
use std::fmt;
use std::str::FromStr;
use Date;
pub const DATE_NEWTYPE_STRUCT_NAME: &'static str = "PLIST-DATE";
impl Serialize for Date {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer
{
let date_str = self.to_string();
serializer.serialize_newtype_struct(DATE_NEWTYPE_STRUCT_NAME, &date_str)
}
}
struct DateNewtypeVisitor;
impl<'de> Visitor<'de> for DateNewtypeVisitor {
type Value = Date;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a plist date newtype")
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where D: Deserializer<'de>
{
deserializer.deserialize_str(DateStrVisitor)
}
}
struct DateStrVisitor;
impl<'de> Visitor<'de> for DateStrVisitor {
type Value = Date;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a plist date string")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where E: Error
{
Date::from_str(v).map_err(|_| E::invalid_value(Unexpected::Str(v), &self))
}
}
impl<'de> Deserialize<'de> for Date {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
deserializer.deserialize_newtype_struct(DATE_NEWTYPE_STRUCT_NAME, DateNewtypeVisitor)
}
}
}
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