545 lines
17 KiB
Rust
545 lines
17 KiB
Rust
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use std::error;
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use std::fmt;
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use std::str::{self, FromStr};
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use serde::{de, ser};
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/// A parsed TOML datetime value
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///
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/// This structure is intended to represent the datetime primitive type that can
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/// be encoded into TOML documents. This type is a parsed version that contains
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/// all metadata internally.
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///
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/// Currently this type is intentionally conservative and only supports
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/// `to_string` as an accessor. Over time though it's intended that it'll grow
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/// more support!
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///
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/// Note that if you're using `Deserialize` to deserialize a TOML document, you
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/// can use this as a placeholder for where you're expecting a datetime to be
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/// specified.
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///
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/// Also note though that while this type implements `Serialize` and
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/// `Deserialize` it's only recommended to use this type with the TOML format,
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/// otherwise encoded in other formats it may look a little odd.
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///
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/// Depending on how the option values are used, this struct will correspond
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/// with one of the following four datetimes from the [TOML v1.0.0 spec]:
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///
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/// | `date` | `time` | `offset` | TOML type |
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/// | --------- | --------- | --------- | ------------------ |
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/// | `Some(_)` | `Some(_)` | `Some(_)` | [Offset Date-Time] |
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/// | `Some(_)` | `Some(_)` | `None` | [Local Date-Time] |
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/// | `Some(_)` | `None` | `None` | [Local Date] |
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/// | `None` | `Some(_)` | `None` | [Local Time] |
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///
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/// **1. Offset Date-Time**: If all the optional values are used, `Datetime`
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/// corresponds to an [Offset Date-Time]. From the TOML v1.0.0 spec:
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///
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/// > To unambiguously represent a specific instant in time, you may use an
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/// > RFC 3339 formatted date-time with offset.
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/// >
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/// > ```toml
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/// > odt1 = 1979-05-27T07:32:00Z
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/// > odt2 = 1979-05-27T00:32:00-07:00
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/// > odt3 = 1979-05-27T00:32:00.999999-07:00
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/// > ```
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/// >
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/// > For the sake of readability, you may replace the T delimiter between date
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/// > and time with a space character (as permitted by RFC 3339 section 5.6).
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/// >
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/// > ```toml
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/// > odt4 = 1979-05-27 07:32:00Z
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/// > ```
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///
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/// **2. Local Date-Time**: If `date` and `time` are given but `offset` is
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/// `None`, `Datetime` corresponds to a [Local Date-Time]. From the spec:
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///
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/// > If you omit the offset from an RFC 3339 formatted date-time, it will
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/// > represent the given date-time without any relation to an offset or
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/// > timezone. It cannot be converted to an instant in time without additional
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/// > information. Conversion to an instant, if required, is implementation-
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/// > specific.
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/// >
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/// > ```toml
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/// > ldt1 = 1979-05-27T07:32:00
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/// > ldt2 = 1979-05-27T00:32:00.999999
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/// > ```
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///
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/// **3. Local Date**: If only `date` is given, `Datetime` corresponds to a
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/// [Local Date]; see the docs for [`Date`].
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///
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/// **4. Local Time**: If only `time` is given, `Datetime` corresponds to a
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/// [Local Time]; see the docs for [`Time`].
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///
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/// [TOML v1.0.0 spec]: https://toml.io/en/v1.0.0
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/// [Offset Date-Time]: https://toml.io/en/v1.0.0#offset-date-time
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/// [Local Date-Time]: https://toml.io/en/v1.0.0#local-date-time
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/// [Local Date]: https://toml.io/en/v1.0.0#local-date
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/// [Local Time]: https://toml.io/en/v1.0.0#local-time
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#[derive(PartialEq, Clone)]
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pub struct Datetime {
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/// Optional date.
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/// Required for: *Offset Date-Time*, *Local Date-Time*, *Local Date*.
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pub date: Option<Date>,
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/// Optional time.
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/// Required for: *Offset Date-Time*, *Local Date-Time*, *Local Time*.
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pub time: Option<Time>,
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/// Optional offset.
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/// Required for: *Offset Date-Time*.
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pub offset: Option<Offset>,
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}
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/// Error returned from parsing a `Datetime` in the `FromStr` implementation.
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#[derive(Debug, Clone)]
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pub struct DatetimeParseError {
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_private: (),
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}
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// Currently serde itself doesn't have a datetime type, so we map our `Datetime`
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// to a special valid in the serde data model. Namely one with these special
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// fields/struct names.
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//
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// In general the TOML encoder/decoder will catch this and not literally emit
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// these strings but rather emit datetimes as they're intended.
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pub const FIELD: &str = "$__toml_private_datetime";
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pub const NAME: &str = "$__toml_private_Datetime";
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/// A parsed TOML date value
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///
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/// May be part of a [`Datetime`]. Alone, `Date` corresponds to a [Local Date].
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/// From the TOML v1.0.0 spec:
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///
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/// > If you include only the date portion of an RFC 3339 formatted date-time,
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/// > it will represent that entire day without any relation to an offset or
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/// > timezone.
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/// >
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/// > ```toml
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/// > ld1 = 1979-05-27
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/// > ```
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///
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/// [Local Date]: https://toml.io/en/v1.0.0#local-date
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#[derive(PartialEq, Clone)]
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pub struct Date {
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/// Year: four digits
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pub year: u16,
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/// Month: 1 to 12
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pub month: u8,
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/// Day: 1 to {28, 29, 30, 31} (based on month/year)
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pub day: u8,
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}
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/// A parsed TOML time value
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///
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/// May be part of a [`Datetime`]. Alone, `Time` corresponds to a [Local Time].
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/// From the TOML v1.0.0 spec:
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///
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/// > If you include only the time portion of an RFC 3339 formatted date-time,
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/// > it will represent that time of day without any relation to a specific
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/// > day or any offset or timezone.
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/// >
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/// > ```toml
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/// > lt1 = 07:32:00
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/// > lt2 = 00:32:00.999999
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/// > ```
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/// >
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/// > Millisecond precision is required. Further precision of fractional
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/// > seconds is implementation-specific. If the value contains greater
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/// > precision than the implementation can support, the additional precision
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/// > must be truncated, not rounded.
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///
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/// [Local Time]: https://toml.io/en/v1.0.0#local-time
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#[derive(PartialEq, Clone)]
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pub struct Time {
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/// Hour: 0 to 23
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pub hour: u8,
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/// Minute: 0 to 59
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pub minute: u8,
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/// Second: 0 to {58, 59, 60} (based on leap second rules)
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pub second: u8,
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/// Nanosecond: 0 to 999_999_999
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pub nanosecond: u32,
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}
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/// A parsed TOML time offset
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///
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#[derive(PartialEq, Clone)]
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pub enum Offset {
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/// > A suffix which, when applied to a time, denotes a UTC offset of 00:00;
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/// > often spoken "Zulu" from the ICAO phonetic alphabet representation of
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/// > the letter "Z". --- [RFC 3339 section 2]
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///
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/// [RFC 3339 section 2]: https://datatracker.ietf.org/doc/html/rfc3339#section-2
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Z,
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/// Offset between local time and UTC
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Custom {
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/// Hours: -12 to +12
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hours: i8,
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/// Minutes: 0 to 59
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minutes: u8,
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},
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}
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impl fmt::Debug for Datetime {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt::Display::fmt(self, f)
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}
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}
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impl fmt::Display for Datetime {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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if let Some(ref date) = self.date {
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write!(f, "{}", date)?;
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}
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if let Some(ref time) = self.time {
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if self.date.is_some() {
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write!(f, "T")?;
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}
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write!(f, "{}", time)?;
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}
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if let Some(ref offset) = self.offset {
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write!(f, "{}", offset)?;
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}
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Ok(())
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}
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}
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impl fmt::Display for Date {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{:04}-{:02}-{:02}", self.year, self.month, self.day)
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}
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}
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impl fmt::Display for Time {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{:02}:{:02}:{:02}", self.hour, self.minute, self.second)?;
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if self.nanosecond != 0 {
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let s = format!("{:09}", self.nanosecond);
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write!(f, ".{}", s.trim_end_matches('0'))?;
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}
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Ok(())
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}
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}
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impl fmt::Display for Offset {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match *self {
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Offset::Z => write!(f, "Z"),
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Offset::Custom { hours, minutes } => write!(f, "{:+03}:{:02}", hours, minutes),
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}
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}
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}
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impl FromStr for Datetime {
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type Err = DatetimeParseError;
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fn from_str(date: &str) -> Result<Datetime, DatetimeParseError> {
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// Accepted formats:
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//
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// 0000-00-00T00:00:00.00Z
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// 0000-00-00T00:00:00.00
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// 0000-00-00
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// 00:00:00.00
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if date.len() < 3 {
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return Err(DatetimeParseError { _private: () });
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}
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let mut offset_allowed = true;
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let mut chars = date.chars();
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// First up, parse the full date if we can
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let full_date = if chars.clone().nth(2) == Some(':') {
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offset_allowed = false;
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None
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} else {
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let y1 = u16::from(digit(&mut chars)?);
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let y2 = u16::from(digit(&mut chars)?);
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let y3 = u16::from(digit(&mut chars)?);
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let y4 = u16::from(digit(&mut chars)?);
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match chars.next() {
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Some('-') => {}
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_ => return Err(DatetimeParseError { _private: () }),
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}
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let m1 = digit(&mut chars)?;
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let m2 = digit(&mut chars)?;
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match chars.next() {
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Some('-') => {}
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_ => return Err(DatetimeParseError { _private: () }),
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}
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let d1 = digit(&mut chars)?;
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let d2 = digit(&mut chars)?;
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let date = Date {
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year: y1 * 1000 + y2 * 100 + y3 * 10 + y4,
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month: m1 * 10 + m2,
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day: d1 * 10 + d2,
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};
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if date.month < 1 || date.month > 12 {
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return Err(DatetimeParseError { _private: () });
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}
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if date.day < 1 || date.day > 31 {
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return Err(DatetimeParseError { _private: () });
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}
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Some(date)
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};
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// Next parse the "partial-time" if available
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let next = chars.clone().next();
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let partial_time = if full_date.is_some()
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&& (next == Some('T') || next == Some('t') || next == Some(' '))
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{
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chars.next();
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true
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} else {
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full_date.is_none()
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};
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let time = if partial_time {
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let h1 = digit(&mut chars)?;
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let h2 = digit(&mut chars)?;
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match chars.next() {
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Some(':') => {}
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_ => return Err(DatetimeParseError { _private: () }),
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}
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let m1 = digit(&mut chars)?;
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let m2 = digit(&mut chars)?;
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match chars.next() {
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Some(':') => {}
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_ => return Err(DatetimeParseError { _private: () }),
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}
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let s1 = digit(&mut chars)?;
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let s2 = digit(&mut chars)?;
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let mut nanosecond = 0;
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if chars.clone().next() == Some('.') {
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chars.next();
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let whole = chars.as_str();
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let mut end = whole.len();
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for (i, byte) in whole.bytes().enumerate() {
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match byte {
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b'0'..=b'9' => {
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if i < 9 {
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let p = 10_u32.pow(8 - i as u32);
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nanosecond += p * u32::from(byte - b'0');
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}
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}
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_ => {
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end = i;
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break;
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}
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}
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}
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if end == 0 {
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return Err(DatetimeParseError { _private: () });
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}
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chars = whole[end..].chars();
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}
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let time = Time {
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hour: h1 * 10 + h2,
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minute: m1 * 10 + m2,
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second: s1 * 10 + s2,
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nanosecond,
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};
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if time.hour > 24 {
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return Err(DatetimeParseError { _private: () });
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}
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if time.minute > 59 {
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return Err(DatetimeParseError { _private: () });
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}
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if time.second > 59 {
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return Err(DatetimeParseError { _private: () });
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}
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if time.nanosecond > 999_999_999 {
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return Err(DatetimeParseError { _private: () });
|
||
|
|
}
|
||
|
|
|
||
|
|
Some(time)
|
||
|
|
} else {
|
||
|
|
offset_allowed = false;
|
||
|
|
None
|
||
|
|
};
|
||
|
|
|
||
|
|
// And finally, parse the offset
|
||
|
|
let offset = if offset_allowed {
|
||
|
|
let next = chars.clone().next();
|
||
|
|
if next == Some('Z') || next == Some('z') {
|
||
|
|
chars.next();
|
||
|
|
Some(Offset::Z)
|
||
|
|
} else if next.is_none() {
|
||
|
|
None
|
||
|
|
} else {
|
||
|
|
let sign = match next {
|
||
|
|
Some('+') => 1,
|
||
|
|
Some('-') => -1,
|
||
|
|
_ => return Err(DatetimeParseError { _private: () }),
|
||
|
|
};
|
||
|
|
chars.next();
|
||
|
|
let h1 = digit(&mut chars)? as i8;
|
||
|
|
let h2 = digit(&mut chars)? as i8;
|
||
|
|
match chars.next() {
|
||
|
|
Some(':') => {}
|
||
|
|
_ => return Err(DatetimeParseError { _private: () }),
|
||
|
|
}
|
||
|
|
let m1 = digit(&mut chars)?;
|
||
|
|
let m2 = digit(&mut chars)?;
|
||
|
|
|
||
|
|
Some(Offset::Custom {
|
||
|
|
hours: sign * (h1 * 10 + h2),
|
||
|
|
minutes: m1 * 10 + m2,
|
||
|
|
})
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
None
|
||
|
|
};
|
||
|
|
|
||
|
|
// Return an error if we didn't hit eof, otherwise return our parsed
|
||
|
|
// date
|
||
|
|
if chars.next().is_some() {
|
||
|
|
return Err(DatetimeParseError { _private: () });
|
||
|
|
}
|
||
|
|
|
||
|
|
Ok(Datetime {
|
||
|
|
date: full_date,
|
||
|
|
time,
|
||
|
|
offset,
|
||
|
|
})
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn digit(chars: &mut str::Chars<'_>) -> Result<u8, DatetimeParseError> {
|
||
|
|
match chars.next() {
|
||
|
|
Some(c) if '0' <= c && c <= '9' => Ok(c as u8 - b'0'),
|
||
|
|
_ => Err(DatetimeParseError { _private: () }),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl ser::Serialize for Datetime {
|
||
|
|
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
|
||
|
|
where
|
||
|
|
S: ser::Serializer,
|
||
|
|
{
|
||
|
|
use serde::ser::SerializeStruct;
|
||
|
|
|
||
|
|
let mut s = serializer.serialize_struct(NAME, 1)?;
|
||
|
|
s.serialize_field(FIELD, &self.to_string())?;
|
||
|
|
s.end()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<'de> de::Deserialize<'de> for Datetime {
|
||
|
|
fn deserialize<D>(deserializer: D) -> Result<Datetime, D::Error>
|
||
|
|
where
|
||
|
|
D: de::Deserializer<'de>,
|
||
|
|
{
|
||
|
|
struct DatetimeVisitor;
|
||
|
|
|
||
|
|
impl<'de> de::Visitor<'de> for DatetimeVisitor {
|
||
|
|
type Value = Datetime;
|
||
|
|
|
||
|
|
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
|
|
formatter.write_str("a TOML datetime")
|
||
|
|
}
|
||
|
|
|
||
|
|
fn visit_map<V>(self, mut visitor: V) -> Result<Datetime, V::Error>
|
||
|
|
where
|
||
|
|
V: de::MapAccess<'de>,
|
||
|
|
{
|
||
|
|
let value = visitor.next_key::<DatetimeKey>()?;
|
||
|
|
if value.is_none() {
|
||
|
|
return Err(de::Error::custom("datetime key not found"));
|
||
|
|
}
|
||
|
|
let v: DatetimeFromString = visitor.next_value()?;
|
||
|
|
Ok(v.value)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static FIELDS: [&str; 1] = [FIELD];
|
||
|
|
deserializer.deserialize_struct(NAME, &FIELDS, DatetimeVisitor)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct DatetimeKey;
|
||
|
|
|
||
|
|
impl<'de> de::Deserialize<'de> for DatetimeKey {
|
||
|
|
fn deserialize<D>(deserializer: D) -> Result<DatetimeKey, D::Error>
|
||
|
|
where
|
||
|
|
D: de::Deserializer<'de>,
|
||
|
|
{
|
||
|
|
struct FieldVisitor;
|
||
|
|
|
||
|
|
impl<'de> de::Visitor<'de> for FieldVisitor {
|
||
|
|
type Value = ();
|
||
|
|
|
||
|
|
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
|
|
formatter.write_str("a valid datetime field")
|
||
|
|
}
|
||
|
|
|
||
|
|
fn visit_str<E>(self, s: &str) -> Result<(), E>
|
||
|
|
where
|
||
|
|
E: de::Error,
|
||
|
|
{
|
||
|
|
if s == FIELD {
|
||
|
|
Ok(())
|
||
|
|
} else {
|
||
|
|
Err(de::Error::custom("expected field with custom name"))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
deserializer.deserialize_identifier(FieldVisitor)?;
|
||
|
|
Ok(DatetimeKey)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pub struct DatetimeFromString {
|
||
|
|
pub value: Datetime,
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<'de> de::Deserialize<'de> for DatetimeFromString {
|
||
|
|
fn deserialize<D>(deserializer: D) -> Result<DatetimeFromString, D::Error>
|
||
|
|
where
|
||
|
|
D: de::Deserializer<'de>,
|
||
|
|
{
|
||
|
|
struct Visitor;
|
||
|
|
|
||
|
|
impl<'de> de::Visitor<'de> for Visitor {
|
||
|
|
type Value = DatetimeFromString;
|
||
|
|
|
||
|
|
fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
|
|
formatter.write_str("string containing a datetime")
|
||
|
|
}
|
||
|
|
|
||
|
|
fn visit_str<E>(self, s: &str) -> Result<DatetimeFromString, E>
|
||
|
|
where
|
||
|
|
E: de::Error,
|
||
|
|
{
|
||
|
|
match s.parse() {
|
||
|
|
Ok(date) => Ok(DatetimeFromString { value: date }),
|
||
|
|
Err(e) => Err(de::Error::custom(e)),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
deserializer.deserialize_str(Visitor)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl fmt::Display for DatetimeParseError {
|
||
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
|
|
"failed to parse datetime".fmt(f)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
impl error::Error for DatetimeParseError {}
|