time/error/
format.rs

1//! Error formatting a struct
2
3use core::fmt;
4use std::io;
5
6use crate::error;
7
8/// An error occurred when formatting.
9#[non_exhaustive]
10#[allow(missing_copy_implementations)]
11#[derive(Debug)]
12pub enum Format {
13    /// The type being formatted does not contain sufficient information to format a component.
14    #[non_exhaustive]
15    InsufficientTypeInformation,
16    /// The component named has a value that cannot be formatted into the requested format.
17    ///
18    /// This variant is only returned when using well-known formats.
19    InvalidComponent(&'static str),
20    /// A value of `std::io::Error` was returned internally.
21    StdIo(io::Error),
22}
23
24impl fmt::Display for Format {
25    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
26        match self {
27            Self::InsufficientTypeInformation => f.write_str(
28                "The type being formatted does not contain sufficient information to format a \
29                 component.",
30            ),
31            Self::InvalidComponent(component) => write!(
32                f,
33                "The {component} component cannot be formatted into the requested format."
34            ),
35            Self::StdIo(err) => err.fmt(f),
36        }
37    }
38}
39
40impl From<io::Error> for Format {
41    fn from(err: io::Error) -> Self {
42        Self::StdIo(err)
43    }
44}
45
46impl TryFrom<Format> for io::Error {
47    type Error = error::DifferentVariant;
48
49    fn try_from(err: Format) -> Result<Self, Self::Error> {
50        match err {
51            Format::StdIo(err) => Ok(err),
52            _ => Err(error::DifferentVariant),
53        }
54    }
55}
56
57#[cfg(feature = "std")]
58#[allow(clippy::std_instead_of_core)]
59impl std::error::Error for Format {
60    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
61        match *self {
62            Self::InsufficientTypeInformation | Self::InvalidComponent(_) => None,
63            Self::StdIo(ref err) => Some(err),
64        }
65    }
66}
67
68impl From<Format> for crate::Error {
69    fn from(original: Format) -> Self {
70        Self::Format(original)
71    }
72}
73
74impl TryFrom<crate::Error> for Format {
75    type Error = error::DifferentVariant;
76
77    fn try_from(err: crate::Error) -> Result<Self, Self::Error> {
78        match err {
79            crate::Error::Format(err) => Ok(err),
80            _ => Err(error::DifferentVariant),
81        }
82    }
83}
84
85#[cfg(feature = "serde")]
86impl Format {
87    /// Obtain an error type for the serializer.
88    #[doc(hidden)] // Exposed only for the `declare_format_string` macro
89    pub fn into_invalid_serde_value<S: serde::Serializer>(self) -> S::Error {
90        use serde::ser::Error;
91        S::Error::custom(self)
92    }
93}
time/error/format.rs

time/error/
format.rs
