Aode (Lion)
36a7f9ddcf
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248 lines
7.5 KiB
Rust
248 lines
7.5 KiB
Rust
/*
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* This file is part of ActivityStreams.
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*
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* Copyright © 2020 Riley Trautman
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*
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* ActivityStreams is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ActivityStreams is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ActivityStreams. If not, see <http://www.gnu.org/licenses/>.
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*/
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/// The type xsd:duration represents a duration of time expressed as a number of years, months,
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/// days, hours, minutes, and seconds.
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///
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/// The format of xsd:duration is PnYnMnDTnHnMnS, where P is a literal value that starts the
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/// expression, nY is the number of years followed by a literal Y, nM is the number of months
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/// followed by a literal M, nD is the number of days followed by a literal D, T is a literal value
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/// that separates the date and time, nH is the number of hours followed by a literal H, nM is the
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/// number of minutes followed by a literal M, and nS is the number of seconds followed by a
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/// literal S. The following rules apply to xsd:duration values:
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///
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/// - Any of these numbers and corresponding designators may be absent if they are equal to 0, but
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/// at least one number and designator must appear.
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/// - The numbers may be any unsigned integer, with the exception of the number of seconds, which
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/// may be an unsigned decimal number.
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/// - If a decimal point appears in the number of seconds, there must be at least one digit after
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/// the decimal point.
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/// - A minus sign may appear before the P to specify a negative duration.
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/// - If no time items (hour, minute, second) are present, the letter T must not appear.
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///
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/// ### Note
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///
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/// This implementation converts Months to Days by multiplying by 31, and converts Years to days by
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/// multiplying by 365. If this is an issue for your application, look into specifying days
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/// directly.
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
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pub struct XsdDuration(pub time::Duration);
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/// The error type produced when an XsdDuration cannot be parsed
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#[derive(Clone, Debug)]
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pub struct XsdDurationError;
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impl std::fmt::Display for XsdDurationError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "Could not parse Duration")
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}
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}
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impl std::error::Error for XsdDurationError {}
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impl XsdDuration {
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/// Create a new XsdDuration from a time::Duration
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pub fn new(duration: time::Duration) -> Self {
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XsdDuration(duration)
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}
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/// Extract the time::Duration from an XsdDuration
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pub fn into_inner(self) -> time::Duration {
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self.0
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}
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/// Borrow the underlying `time::Duration`
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pub fn as_duration(&self) -> &time::Duration {
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self.as_ref()
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}
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/// Mutably borrow the underlying `time::Duration`
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pub fn as_duration_mut(&mut self) -> &mut time::Duration {
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self.as_mut()
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}
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}
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impl From<time::Duration> for XsdDuration {
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fn from(d: time::Duration) -> Self {
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XsdDuration(d)
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}
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}
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impl From<XsdDuration> for time::Duration {
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fn from(d: XsdDuration) -> Self {
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d.0
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}
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}
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impl AsRef<time::Duration> for XsdDuration {
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fn as_ref(&self) -> &time::Duration {
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&self.0
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}
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}
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impl AsMut<time::Duration> for XsdDuration {
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fn as_mut(&mut self) -> &mut time::Duration {
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&mut self.0
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}
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}
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impl std::convert::TryFrom<String> for XsdDuration {
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type Error = XsdDurationError;
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fn try_from(s: String) -> Result<Self, Self::Error> {
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s.parse()
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}
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}
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impl std::convert::TryFrom<&str> for XsdDuration {
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type Error = XsdDurationError;
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fn try_from(s: &str) -> Result<Self, Self::Error> {
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s.parse()
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}
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}
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impl std::convert::TryFrom<&mut str> for XsdDuration {
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type Error = XsdDurationError;
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fn try_from(s: &mut str) -> Result<Self, Self::Error> {
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s.parse()
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}
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}
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impl std::str::FromStr for XsdDuration {
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type Err = XsdDurationError;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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if s.find('P') != Some(0) {
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return Err(XsdDurationError);
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}
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let s = s.trim_start_matches('P');
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let negative = Some(0) == s.find('-');
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let s = s.trim_start_matches('-');
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let (large, small) = if let Some(index) = s.find('T') {
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let (l, s) = s.split_at(index);
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(l, s.trim_start_matches('T'))
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} else {
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(s, "")
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};
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let (years, large) = parse_next(large, 'Y')?;
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let (months, large) = parse_next(large, 'M')?;
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let (days, _) = parse_next(large, 'D')?;
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let (hours, small) = parse_next(small, 'H')?;
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let (minutes, small) = parse_next(small, 'M')?;
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let (seconds, _) = parse_next(small, 'S')?;
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let mut duration = time::Duration::days(365 * years);
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duration += time::Duration::days(31 * months);
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duration += time::Duration::days(days);
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duration += time::Duration::hours(hours);
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duration += time::Duration::minutes(minutes);
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duration += time::Duration::seconds(seconds);
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duration = if negative { duration * -1 } else { duration };
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Ok(XsdDuration(duration))
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}
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}
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fn parse_next(s: &str, c: char) -> Result<(i64, &str), XsdDurationError> {
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let res = if let Some(index) = s.find(c) {
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let (beginning, end) = s.split_at(index);
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let i = beginning.parse().map_err(|_| XsdDurationError)?;
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(i, end.trim_start_matches(c))
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} else {
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(0, s)
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};
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Ok(res)
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}
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impl std::fmt::Display for XsdDuration {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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let (s, mut duration) = if time::Duration::seconds(0) > self.0 {
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("P-".to_string(), self.0 * -1)
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} else {
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("P".to_string(), self.0)
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};
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let s = if duration.whole_days() > 0 {
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format!("{}{}D", s, duration.whole_days())
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} else {
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s
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};
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duration -= time::Duration::days(duration.whole_days());
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let s = if duration.whole_seconds() > 0 {
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format!("{}T", s)
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} else {
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s
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};
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let s = if duration.whole_hours() > 0 {
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format!("{}{}H", s, duration.whole_hours())
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} else {
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s
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};
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duration -= time::Duration::hours(duration.whole_hours());
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let s = if duration.whole_minutes() > 0 {
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format!("{}{}M", s, duration.whole_minutes())
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} else {
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s
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};
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duration -= time::Duration::minutes(duration.whole_minutes());
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let s = if duration.whole_seconds() > 0 {
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format!("{}{}S", s, duration.whole_seconds())
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} else {
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s
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};
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std::fmt::Display::fmt(&s, f)
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}
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}
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impl serde::ser::Serialize for XsdDuration {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: serde::ser::Serializer,
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{
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serializer.serialize_str(&self.to_string())
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}
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}
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impl<'de> serde::de::Deserialize<'de> for XsdDuration {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where
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D: serde::de::Deserializer<'de>,
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{
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let s = String::deserialize(deserializer)?;
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s.parse().map_err(serde::de::Error::custom)
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}
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}
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