time/error/
parse.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
//! Error that occurred at some stage of parsing

use core::convert::Infallible;
use core::fmt;

use crate::error::{self, ParseFromDescription, TryFromParsed};

/// An error that occurred at some stage of parsing.
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Parse {
    #[allow(missing_docs)]
    TryFromParsed(TryFromParsed),
    #[allow(missing_docs)]
    ParseFromDescription(ParseFromDescription),
    #[allow(missing_docs)]
    #[non_exhaustive]
    #[deprecated(
        since = "0.3.28",
        note = "no longer output. moved to the `ParseFromDescription` variant"
    )]
    UnexpectedTrailingCharacters {
        #[doc(hidden)]
        never: Infallible,
    },
}

impl fmt::Display for Parse {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::TryFromParsed(err) => err.fmt(f),
            Self::ParseFromDescription(err) => err.fmt(f),
            #[allow(deprecated)]
            Self::UnexpectedTrailingCharacters { never } => match *never {},
        }
    }
}

#[cfg(feature = "std")]
impl std::error::Error for Parse {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Self::TryFromParsed(err) => Some(err),
            Self::ParseFromDescription(err) => Some(err),
            #[allow(deprecated)]
            Self::UnexpectedTrailingCharacters { never } => match *never {},
        }
    }
}

impl From<TryFromParsed> for Parse {
    fn from(err: TryFromParsed) -> Self {
        Self::TryFromParsed(err)
    }
}

impl TryFrom<Parse> for TryFromParsed {
    type Error = error::DifferentVariant;

    fn try_from(err: Parse) -> Result<Self, Self::Error> {
        match err {
            Parse::TryFromParsed(err) => Ok(err),
            _ => Err(error::DifferentVariant),
        }
    }
}

impl From<ParseFromDescription> for Parse {
    fn from(err: ParseFromDescription) -> Self {
        Self::ParseFromDescription(err)
    }
}

impl TryFrom<Parse> for ParseFromDescription {
    type Error = error::DifferentVariant;

    fn try_from(err: Parse) -> Result<Self, Self::Error> {
        match err {
            Parse::ParseFromDescription(err) => Ok(err),
            _ => Err(error::DifferentVariant),
        }
    }
}

impl From<Parse> for crate::Error {
    fn from(err: Parse) -> Self {
        match err {
            Parse::TryFromParsed(err) => Self::TryFromParsed(err),
            Parse::ParseFromDescription(err) => Self::ParseFromDescription(err),
            #[allow(deprecated)]
            Parse::UnexpectedTrailingCharacters { never } => match never {},
        }
    }
}

impl TryFrom<crate::Error> for Parse {
    type Error = error::DifferentVariant;

    fn try_from(err: crate::Error) -> Result<Self, Self::Error> {
        match err {
            crate::Error::ParseFromDescription(err) => Ok(Self::ParseFromDescription(err)),
            #[allow(deprecated)]
            crate::Error::UnexpectedTrailingCharacters { never } => match never {},
            crate::Error::TryFromParsed(err) => Ok(Self::TryFromParsed(err)),
            _ => Err(error::DifferentVariant),
        }
    }
}