<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/Users/m018/.cargo/registry/src/github.com-1ecc6299db9ec823/chrono-0.4.31/src/format/mod.rs`."><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-c4dbdcde0fbd8430.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../../static.files/light-db279b6232be9c13.css"><link rel="stylesheet" disabled href="../../../static.files/dark-cf923f49f397b216.css"><link rel="stylesheet" disabled href="../../../static.files/ayu-be46fdc453a55015.css"><script src="../../../static.files/storage-3891ce972e3a2bf8.js"></script><script defer src="../../../static.files/source-script-1b95b7cca98b26e5.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../static.files/main-98a684e84ae5b08b.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-13285aec31fa243e.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../../chrono/index.html"><img class="rust-logo" src="../../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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</pre><pre class="rust"><code><span class="comment">// This is a part of Chrono.
// See README.md and LICENSE.txt for details.
</span><span class="doccomment">//! Formatting (and parsing) utilities for date and time.
//!
//! This module provides the common types and routines to implement,
//! for example, [`DateTime::format`](../struct.DateTime.html#method.format) or
//! [`DateTime::parse_from_str`](../struct.DateTime.html#method.parse_from_str) methods.
//! For most cases you should use these high-level interfaces.
//!
//! Internally the formatting and parsing shares the same abstract **formatting items**,
//! which are just an [`Iterator`](https://doc.rust-lang.org/std/iter/trait.Iterator.html) of
//! the [`Item`](./enum.Item.html) type.
//! They are generated from more readable **format strings**;
//! currently Chrono supports a built-in syntax closely resembling
//! C's `strftime` format. The available options can be found [here](./strftime/index.html).
//!
//! # Example
</span><span class="attr">#![cfg_attr(not(feature = <span class="string">"std"</span>), doc = <span class="string">"```ignore"</span>)]
#![cfg_attr(feature = <span class="string">"std"</span>, doc = <span class="string">"```rust"</span>)]
</span><span class="doccomment">//! use chrono::{NaiveDateTime, TimeZone, Utc};
//!
//! let date_time = Utc.with_ymd_and_hms(2020, 11, 10, 0, 1, 32).unwrap();
//!
//! let formatted = format!("{}", date_time.format("%Y-%m-%d %H:%M:%S"));
//! assert_eq!(formatted, "2020-11-10 00:01:32");
//!
//! let parsed = NaiveDateTime::parse_from_str(&formatted, "%Y-%m-%d %H:%M:%S")?.and_utc();
//! assert_eq!(parsed, date_time);
//! # Ok::<(), chrono::ParseError>(())
//! ```
</span><span class="attr">#[cfg(feature = <span class="string">"alloc"</span>)]
</span><span class="kw">use </span>alloc::boxed::Box;
<span class="kw">use </span>core::fmt;
<span class="kw">use </span>core::str::FromStr;
<span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
</span><span class="kw">use </span>std::error::Error;
<span class="kw">use crate</span>::{Month, ParseMonthError, ParseWeekdayError, Weekday};
<span class="kw">mod </span>formatting;
<span class="kw">mod </span>parsed;
<span class="comment">// due to the size of parsing routines, they are in separate modules.
</span><span class="kw">mod </span>parse;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>scan;
<span class="kw">pub mod </span>strftime;
<span class="attr">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>locales;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>formatting::write_hundreds;
<span class="attr">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>formatting::write_rfc2822;
<span class="attr">#[cfg(any(
feature = <span class="string">"alloc"</span>,
feature = <span class="string">"std"</span>,
feature = <span class="string">"serde"</span>,
feature = <span class="string">"rustc-serialize"
</span>))]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>formatting::write_rfc3339;
<span class="attr">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))]
</span><span class="kw">pub use </span>formatting::{format, format_item, DelayedFormat};
<span class="attr">#[cfg(feature = <span class="string">"unstable-locales"</span>)]
</span><span class="kw">pub use </span>formatting::{format_item_localized, format_localized};
<span class="attr">#[cfg(all(feature = <span class="string">"unstable-locales"</span>, any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>)))]
</span><span class="kw">pub use </span>locales::Locale;
<span class="attr">#[cfg(all(not(feature = <span class="string">"unstable-locales"</span>), any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>)))]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>locales::Locale;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>parse::parse_rfc3339;
<span class="kw">pub use </span>parse::{parse, parse_and_remainder};
<span class="kw">pub use </span>parsed::Parsed;
<span class="kw">pub use </span>strftime::StrftimeItems;
<span class="doccomment">/// An uninhabited type used for `InternalNumeric` and `InternalFixed` below.
</span><span class="attr">#[derive(Clone, PartialEq, Eq, Hash)]
</span><span class="kw">enum </span>Void {}
<span class="doccomment">/// Padding characters for numeric items.
</span><span class="attr">#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
</span><span class="kw">pub enum </span>Pad {
<span class="doccomment">/// No padding.
</span><span class="prelude-val">None</span>,
<span class="doccomment">/// Zero (`0`) padding.
</span>Zero,
<span class="doccomment">/// Space padding.
</span>Space,
}
<span class="doccomment">/// Numeric item types.
/// They have associated formatting width (FW) and parsing width (PW).
///
/// The **formatting width** is the minimal width to be formatted.
/// If the number is too short, and the padding is not [`Pad::None`](./enum.Pad.html#variant.None),
/// then it is left-padded.
/// If the number is too long or (in some cases) negative, it is printed as is.
///
/// The **parsing width** is the maximal width to be scanned.
/// The parser only tries to consume from one to given number of digits (greedily).
/// It also trims the preceding whitespace if any.
/// It cannot parse the negative number, so some date and time cannot be formatted then
/// parsed with the same formatting items.
</span><span class="attr">#[derive(Clone, PartialEq, Eq, Debug, Hash)]
</span><span class="kw">pub enum </span>Numeric {
<span class="doccomment">/// Full Gregorian year (FW=4, PW=∞).
/// May accept years before 1 BCE or after 9999 CE, given an initial sign (+/-).
</span>Year,
<span class="doccomment">/// Gregorian year divided by 100 (century number; FW=PW=2). Implies the non-negative year.
</span>YearDiv100,
<span class="doccomment">/// Gregorian year modulo 100 (FW=PW=2). Cannot be negative.
</span>YearMod100,
<span class="doccomment">/// Year in the ISO week date (FW=4, PW=∞).
/// May accept years before 1 BCE or after 9999 CE, given an initial sign.
</span>IsoYear,
<span class="doccomment">/// Year in the ISO week date, divided by 100 (FW=PW=2). Implies the non-negative year.
</span>IsoYearDiv100,
<span class="doccomment">/// Year in the ISO week date, modulo 100 (FW=PW=2). Cannot be negative.
</span>IsoYearMod100,
<span class="doccomment">/// Month (FW=PW=2).
</span>Month,
<span class="doccomment">/// Day of the month (FW=PW=2).
</span>Day,
<span class="doccomment">/// Week number, where the week 1 starts at the first Sunday of January (FW=PW=2).
</span>WeekFromSun,
<span class="doccomment">/// Week number, where the week 1 starts at the first Monday of January (FW=PW=2).
</span>WeekFromMon,
<span class="doccomment">/// Week number in the ISO week date (FW=PW=2).
</span>IsoWeek,
<span class="doccomment">/// Day of the week, where Sunday = 0 and Saturday = 6 (FW=PW=1).
</span>NumDaysFromSun,
<span class="doccomment">/// Day of the week, where Monday = 1 and Sunday = 7 (FW=PW=1).
</span>WeekdayFromMon,
<span class="doccomment">/// Day of the year (FW=PW=3).
</span>Ordinal,
<span class="doccomment">/// Hour number in the 24-hour clocks (FW=PW=2).
</span>Hour,
<span class="doccomment">/// Hour number in the 12-hour clocks (FW=PW=2).
</span>Hour12,
<span class="doccomment">/// The number of minutes since the last whole hour (FW=PW=2).
</span>Minute,
<span class="doccomment">/// The number of seconds since the last whole minute (FW=PW=2).
</span>Second,
<span class="doccomment">/// The number of nanoseconds since the last whole second (FW=PW=9).
/// Note that this is *not* left-aligned;
/// see also [`Fixed::Nanosecond`](./enum.Fixed.html#variant.Nanosecond).
</span>Nanosecond,
<span class="doccomment">/// The number of non-leap seconds since the midnight UTC on January 1, 1970 (FW=1, PW=∞).
/// For formatting, it assumes UTC upon the absence of time zone offset.
</span>Timestamp,
<span class="doccomment">/// Internal uses only.
///
/// This item exists so that one can add additional internal-only formatting
/// without breaking major compatibility (as enum variants cannot be selectively private).
</span>Internal(InternalNumeric),
}
<span class="doccomment">/// An opaque type representing numeric item types for internal uses only.
</span><span class="attr">#[derive(Clone, Eq, Hash, PartialEq)]
</span><span class="kw">pub struct </span>InternalNumeric {
_dummy: Void,
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>InternalNumeric {
<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result {
<span class="macro">write!</span>(f, <span class="string">"<InternalNumeric>"</span>)
}
}
<span class="doccomment">/// Fixed-format item types.
///
/// They have their own rules of formatting and parsing.
/// Otherwise noted, they print in the specified cases but parse case-insensitively.
</span><span class="attr">#[derive(Clone, PartialEq, Eq, Debug, Hash)]
</span><span class="kw">pub enum </span>Fixed {
<span class="doccomment">/// Abbreviated month names.
///
/// Prints a three-letter-long name in the title case, reads the same name in any case.
</span>ShortMonthName,
<span class="doccomment">/// Full month names.
///
/// Prints a full name in the title case, reads either a short or full name in any case.
</span>LongMonthName,
<span class="doccomment">/// Abbreviated day of the week names.
///
/// Prints a three-letter-long name in the title case, reads the same name in any case.
</span>ShortWeekdayName,
<span class="doccomment">/// Full day of the week names.
///
/// Prints a full name in the title case, reads either a short or full name in any case.
</span>LongWeekdayName,
<span class="doccomment">/// AM/PM.
///
/// Prints in lower case, reads in any case.
</span>LowerAmPm,
<span class="doccomment">/// AM/PM.
///
/// Prints in upper case, reads in any case.
</span>UpperAmPm,
<span class="doccomment">/// An optional dot plus one or more digits for left-aligned nanoseconds.
/// May print nothing, 3, 6 or 9 digits according to the available accuracy.
/// See also [`Numeric::Nanosecond`](./enum.Numeric.html#variant.Nanosecond).
</span>Nanosecond,
<span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 3.
</span>Nanosecond3,
<span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 6.
</span>Nanosecond6,
<span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 9.
</span>Nanosecond9,
<span class="doccomment">/// Timezone name.
///
/// It does not support parsing, its use in the parser is an immediate failure.
</span>TimezoneName,
<span class="doccomment">/// Offset from the local time to UTC (`+09:00` or `-04:00` or `+00:00`).
///
/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
/// The offset is limited from `-24:00` to `+24:00`,
/// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)'s range.
</span>TimezoneOffsetColon,
<span class="doccomment">/// Offset from the local time to UTC with seconds (`+09:00:00` or `-04:00:00` or `+00:00:00`).
///
/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
/// The offset is limited from `-24:00:00` to `+24:00:00`,
/// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)'s range.
</span>TimezoneOffsetDoubleColon,
<span class="doccomment">/// Offset from the local time to UTC without minutes (`+09` or `-04` or `+00`).
///
/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace.
/// The offset is limited from `-24` to `+24`,
/// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)'s range.
</span>TimezoneOffsetTripleColon,
<span class="doccomment">/// Offset from the local time to UTC (`+09:00` or `-04:00` or `Z`).
///
/// In the parser, the colon can be omitted and/or surrounded with any amount of whitespace,
/// and `Z` can be either in upper case or in lower case.
/// The offset is limited from `-24:00` to `+24:00`,
/// which is the same as [`FixedOffset`](../offset/struct.FixedOffset.html)'s range.
</span>TimezoneOffsetColonZ,
<span class="doccomment">/// Same as [`TimezoneOffsetColon`](#variant.TimezoneOffsetColon) but prints no colon.
/// Parsing allows an optional colon.
</span>TimezoneOffset,
<span class="doccomment">/// Same as [`TimezoneOffsetColonZ`](#variant.TimezoneOffsetColonZ) but prints no colon.
/// Parsing allows an optional colon.
</span>TimezoneOffsetZ,
<span class="doccomment">/// RFC 2822 date and time syntax. Commonly used for email and MIME date and time.
</span>RFC2822,
<span class="doccomment">/// RFC 3339 & ISO 8601 date and time syntax.
</span>RFC3339,
<span class="doccomment">/// Internal uses only.
///
/// This item exists so that one can add additional internal-only formatting
/// without breaking major compatibility (as enum variants cannot be selectively private).
</span>Internal(InternalFixed),
}
<span class="doccomment">/// An opaque type representing fixed-format item types for internal uses only.
</span><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
</span><span class="kw">pub struct </span>InternalFixed {
val: InternalInternal,
}
<span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
</span><span class="kw">enum </span>InternalInternal {
<span class="doccomment">/// Same as [`TimezoneOffsetColonZ`](#variant.TimezoneOffsetColonZ), but
/// allows missing minutes (per [ISO 8601][iso8601]).
///
/// # Panics
///
/// If you try to use this for printing.
///
/// [iso8601]: https://en.wikipedia.org/wiki/ISO_8601#Time_offsets_from_UTC
</span>TimezoneOffsetPermissive,
<span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 3 and there is no leading dot.
</span>Nanosecond3NoDot,
<span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 6 and there is no leading dot.
</span>Nanosecond6NoDot,
<span class="doccomment">/// Same as [`Nanosecond`](#variant.Nanosecond) but the accuracy is fixed to 9 and there is no leading dot.
</span>Nanosecond9NoDot,
}
<span class="doccomment">/// Type for specifying the format of UTC offsets.
</span><span class="attr">#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
</span><span class="kw">pub struct </span>OffsetFormat {
<span class="doccomment">/// See `OffsetPrecision`.
</span><span class="kw">pub </span>precision: OffsetPrecision,
<span class="doccomment">/// Separator between hours, minutes and seconds.
</span><span class="kw">pub </span>colons: Colons,
<span class="doccomment">/// Represent `+00:00` as `Z`.
</span><span class="kw">pub </span>allow_zulu: bool,
<span class="doccomment">/// Pad the hour value to two digits.
</span><span class="kw">pub </span>padding: Pad,
}
<span class="doccomment">/// The precision of an offset from UTC formatting item.
</span><span class="attr">#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
</span><span class="kw">pub enum </span>OffsetPrecision {
<span class="doccomment">/// Format offset from UTC as only hours. Not recommended, it is not uncommon for timezones to
/// have an offset of 30 minutes, 15 minutes, etc.
/// Any minutes and seconds get truncated.
</span>Hours,
<span class="doccomment">/// Format offset from UTC as hours and minutes.
/// Any seconds will be rounded to the nearest minute.
</span>Minutes,
<span class="doccomment">/// Format offset from UTC as hours, minutes and seconds.
</span>Seconds,
<span class="doccomment">/// Format offset from UTC as hours, and optionally with minutes.
/// Any seconds will be rounded to the nearest minute.
</span>OptionalMinutes,
<span class="doccomment">/// Format offset from UTC as hours and minutes, and optionally seconds.
</span>OptionalSeconds,
<span class="doccomment">/// Format offset from UTC as hours and optionally minutes and seconds.
</span>OptionalMinutesAndSeconds,
}
<span class="doccomment">/// The separator between hours and minutes in an offset.
</span><span class="attr">#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
</span><span class="kw">pub enum </span>Colons {
<span class="doccomment">/// No separator
</span><span class="prelude-val">None</span>,
<span class="doccomment">/// Colon (`:`) as separator
</span>Colon,
<span class="doccomment">/// No separator when formatting, colon allowed when parsing.
</span>Maybe,
}
<span class="doccomment">/// A single formatting item. This is used for both formatting and parsing.
</span><span class="attr">#[derive(Clone, PartialEq, Eq, Debug, Hash)]
</span><span class="kw">pub enum </span>Item<<span class="lifetime">'a</span>> {
<span class="doccomment">/// A literally printed and parsed text.
</span>Literal(<span class="kw-2">&</span><span class="lifetime">'a </span>str),
<span class="doccomment">/// Same as `Literal` but with the string owned by the item.
</span><span class="attr">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))]
#[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))))]
</span>OwnedLiteral(Box<str>),
<span class="doccomment">/// Whitespace. Prints literally but reads zero or more whitespace.
</span>Space(<span class="kw-2">&</span><span class="lifetime">'a </span>str),
<span class="doccomment">/// Same as `Space` but with the string owned by the item.
</span><span class="attr">#[cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))]
#[cfg_attr(docsrs, doc(cfg(any(feature = <span class="string">"alloc"</span>, feature = <span class="string">"std"</span>))))]
</span>OwnedSpace(Box<str>),
<span class="doccomment">/// Numeric item. Can be optionally padded to the maximal length (if any) when formatting;
/// the parser simply ignores any padded whitespace and zeroes.
</span>Numeric(Numeric, Pad),
<span class="doccomment">/// Fixed-format item.
</span>Fixed(Fixed),
<span class="doccomment">/// Issues a formatting error. Used to signal an invalid format string.
</span>Error,
}
<span class="kw">const fn </span>num(numeric: Numeric) -> Item<<span class="lifetime">'static</span>> {
Item::Numeric(numeric, Pad::None)
}
<span class="kw">const fn </span>num0(numeric: Numeric) -> Item<<span class="lifetime">'static</span>> {
Item::Numeric(numeric, Pad::Zero)
}
<span class="kw">const fn </span>nums(numeric: Numeric) -> Item<<span class="lifetime">'static</span>> {
Item::Numeric(numeric, Pad::Space)
}
<span class="kw">const fn </span>fixed(fixed: Fixed) -> Item<<span class="lifetime">'static</span>> {
Item::Fixed(fixed)
}
<span class="kw">const fn </span>internal_fixed(val: InternalInternal) -> Item<<span class="lifetime">'static</span>> {
Item::Fixed(Fixed::Internal(InternalFixed { val }))
}
<span class="doccomment">/// An error from the `parse` function.
</span><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Copy, Hash)]
</span><span class="kw">pub struct </span>ParseError(ParseErrorKind);
<span class="kw">impl </span>ParseError {
<span class="doccomment">/// The category of parse error
</span><span class="kw">pub const fn </span>kind(<span class="kw-2">&</span><span class="self">self</span>) -> ParseErrorKind {
<span class="self">self</span>.<span class="number">0
</span>}
}
<span class="doccomment">/// The category of parse error
</span><span class="attr">#[allow(clippy::manual_non_exhaustive)]
#[derive(Debug, Clone, PartialEq, Eq, Copy, Hash)]
</span><span class="kw">pub enum </span>ParseErrorKind {
<span class="doccomment">/// Given field is out of permitted range.
</span>OutOfRange,
<span class="doccomment">/// There is no possible date and time value with given set of fields.
///
/// This does not include the out-of-range conditions, which are trivially invalid.
/// It includes the case that there are one or more fields that are inconsistent to each other.
</span>Impossible,
<span class="doccomment">/// Given set of fields is not enough to make a requested date and time value.
///
/// Note that there *may* be a case that given fields constrain the possible values so much
/// that there is a unique possible value. Chrono only tries to be correct for
/// most useful sets of fields however, as such constraint solving can be expensive.
</span>NotEnough,
<span class="doccomment">/// The input string has some invalid character sequence for given formatting items.
</span>Invalid,
<span class="doccomment">/// The input string has been prematurely ended.
</span>TooShort,
<span class="doccomment">/// All formatting items have been read but there is a remaining input.
</span>TooLong,
<span class="doccomment">/// There was an error on the formatting string, or there were non-supported formating items.
</span>BadFormat,
<span class="comment">// TODO: Change this to `#[non_exhaustive]` (on the enum) with the next breaking release.
</span><span class="attr">#[doc(hidden)]
</span>__Nonexhaustive,
}
<span class="doccomment">/// Same as `Result<T, ParseError>`.
</span><span class="kw">pub type </span>ParseResult<T> = <span class="prelude-ty">Result</span><T, ParseError>;
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseError {
<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result {
<span class="kw">match </span><span class="self">self</span>.<span class="number">0 </span>{
ParseErrorKind::OutOfRange => <span class="macro">write!</span>(f, <span class="string">"input is out of range"</span>),
ParseErrorKind::Impossible => <span class="macro">write!</span>(f, <span class="string">"no possible date and time matching input"</span>),
ParseErrorKind::NotEnough => <span class="macro">write!</span>(f, <span class="string">"input is not enough for unique date and time"</span>),
ParseErrorKind::Invalid => <span class="macro">write!</span>(f, <span class="string">"input contains invalid characters"</span>),
ParseErrorKind::TooShort => <span class="macro">write!</span>(f, <span class="string">"premature end of input"</span>),
ParseErrorKind::TooLong => <span class="macro">write!</span>(f, <span class="string">"trailing input"</span>),
ParseErrorKind::BadFormat => <span class="macro">write!</span>(f, <span class="string">"bad or unsupported format string"</span>),
<span class="kw">_ </span>=> <span class="macro">unreachable!</span>(),
}
}
}
<span class="attr">#[cfg(feature = <span class="string">"std"</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))]
</span><span class="kw">impl </span>Error <span class="kw">for </span>ParseError {
<span class="attr">#[allow(deprecated)]
</span><span class="kw">fn </span>description(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str {
<span class="string">"parser error, see to_string() for details"
</span>}
}
<span class="comment">// to be used in this module and submodules
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>OUT_OF_RANGE: ParseError = ParseError(ParseErrorKind::OutOfRange);
<span class="kw">const </span>IMPOSSIBLE: ParseError = ParseError(ParseErrorKind::Impossible);
<span class="kw">const </span>NOT_ENOUGH: ParseError = ParseError(ParseErrorKind::NotEnough);
<span class="kw">const </span>INVALID: ParseError = ParseError(ParseErrorKind::Invalid);
<span class="kw">const </span>TOO_SHORT: ParseError = ParseError(ParseErrorKind::TooShort);
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>TOO_LONG: ParseError = ParseError(ParseErrorKind::TooLong);
<span class="kw">const </span>BAD_FORMAT: ParseError = ParseError(ParseErrorKind::BadFormat);
<span class="comment">// this implementation is here only because we need some private code from `scan`
</span><span class="doccomment">/// Parsing a `str` into a `Weekday` uses the format [`%A`](./format/strftime/index.html).
///
/// # Example
///
/// ```
/// use chrono::Weekday;
///
/// assert_eq!("Sunday".parse::<Weekday>(), Ok(Weekday::Sun));
/// assert!("any day".parse::<Weekday>().is_err());
/// ```
///
/// The parsing is case-insensitive.
///
/// ```
/// # use chrono::Weekday;
/// assert_eq!("mON".parse::<Weekday>(), Ok(Weekday::Mon));
/// ```
///
/// Only the shortest form (e.g. `sun`) and the longest form (e.g. `sunday`) is accepted.
///
/// ```
/// # use chrono::Weekday;
/// assert!("thurs".parse::<Weekday>().is_err());
/// ```
</span><span class="kw">impl </span>FromStr <span class="kw">for </span>Weekday {
<span class="kw">type </span><span class="prelude-val">Err </span>= ParseWeekdayError;
<span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Err> {
<span class="kw">if let </span><span class="prelude-val">Ok</span>((<span class="string">""</span>, w)) = scan::short_or_long_weekday(s) {
<span class="prelude-val">Ok</span>(w)
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(ParseWeekdayError { _dummy: () })
}
}
}
<span class="doccomment">/// Parsing a `str` into a `Month` uses the format [`%B`](./format/strftime/index.html).
///
/// # Example
///
/// ```
/// use chrono::Month;
///
/// assert_eq!("January".parse::<Month>(), Ok(Month::January));
/// assert!("any day".parse::<Month>().is_err());
/// ```
///
/// The parsing is case-insensitive.
///
/// ```
/// # use chrono::Month;
/// assert_eq!("fEbruARy".parse::<Month>(), Ok(Month::February));
/// ```
///
/// Only the shortest form (e.g. `jan`) and the longest form (e.g. `january`) is accepted.
///
/// ```
/// # use chrono::Month;
/// assert!("septem".parse::<Month>().is_err());
/// assert!("Augustin".parse::<Month>().is_err());
/// ```
</span><span class="kw">impl </span>FromStr <span class="kw">for </span>Month {
<span class="kw">type </span><span class="prelude-val">Err </span>= ParseMonthError;
<span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Err> {
<span class="kw">if let </span><span class="prelude-val">Ok</span>((<span class="string">""</span>, w)) = scan::short_or_long_month0(s) {
<span class="kw">match </span>w {
<span class="number">0 </span>=> <span class="prelude-val">Ok</span>(Month::January),
<span class="number">1 </span>=> <span class="prelude-val">Ok</span>(Month::February),
<span class="number">2 </span>=> <span class="prelude-val">Ok</span>(Month::March),
<span class="number">3 </span>=> <span class="prelude-val">Ok</span>(Month::April),
<span class="number">4 </span>=> <span class="prelude-val">Ok</span>(Month::May),
<span class="number">5 </span>=> <span class="prelude-val">Ok</span>(Month::June),
<span class="number">6 </span>=> <span class="prelude-val">Ok</span>(Month::July),
<span class="number">7 </span>=> <span class="prelude-val">Ok</span>(Month::August),
<span class="number">8 </span>=> <span class="prelude-val">Ok</span>(Month::September),
<span class="number">9 </span>=> <span class="prelude-val">Ok</span>(Month::October),
<span class="number">10 </span>=> <span class="prelude-val">Ok</span>(Month::November),
<span class="number">11 </span>=> <span class="prelude-val">Ok</span>(Month::December),
<span class="kw">_ </span>=> <span class="prelude-val">Err</span>(ParseMonthError { _dummy: () }),
}
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(ParseMonthError { _dummy: () })
}
}
}
</code></pre></div>
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