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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

//! Invalid format description

use alloc::string::String;
use core::fmt;

use crate::error;

/// The format description provided was not valid.
#[non_exhaustive]
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum InvalidFormatDescription {
    /// There was a bracket pair that was opened but not closed.
    #[non_exhaustive]
    UnclosedOpeningBracket {
        /// The zero-based index of the opening bracket.
        index: usize,
    },
    /// A component name is not valid.
    #[non_exhaustive]
    InvalidComponentName {
        /// The name of the invalid component name.
        name: String,
        /// The zero-based index the component name starts at.
        index: usize,
    },
    /// A modifier is not valid.
    #[non_exhaustive]
    InvalidModifier {
        /// The value of the invalid modifier.
        value: String,
        /// The zero-based index the modifier starts at.
        index: usize,
    },
    /// A component name is missing.
    #[non_exhaustive]
    MissingComponentName {
        /// The zero-based index where the component name should start.
        index: usize,
    },
    /// A required modifier is missing.
    #[non_exhaustive]
    MissingRequiredModifier {
        /// The name of the modifier that is missing.
        name: &'static str,
        /// The zero-based index of the component.
        index: usize,
    },
    /// Something was expected, but not found.
    #[non_exhaustive]
    Expected {
        /// What was expected to be present, but wasn't.
        what: &'static str,
        /// The zero-based index the item was expected to be found at.
        index: usize,
    },
    /// Certain behavior is not supported in the given context.
    #[non_exhaustive]
    NotSupported {
        /// The behavior that is not supported.
        what: &'static str,
        /// The context in which the behavior is not supported.
        context: &'static str,
        /// The zero-based index the error occurred at.
        index: usize,
    },
}

impl From<InvalidFormatDescription> for crate::Error {
    fn from(original: InvalidFormatDescription) -> Self {
        Self::InvalidFormatDescription(original)
    }
}

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

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

impl fmt::Display for InvalidFormatDescription {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        use InvalidFormatDescription::*;
        match self {
            UnclosedOpeningBracket { index } => {
                write!(f, "unclosed opening bracket at byte index {index}")
            }
            InvalidComponentName { name, index } => {
                write!(f, "invalid component name `{name}` at byte index {index}")
            }
            InvalidModifier { value, index } => {
                write!(f, "invalid modifier `{value}` at byte index {index}")
            }
            MissingComponentName { index } => {
                write!(f, "missing component name at byte index {index}")
            }
            MissingRequiredModifier { name, index } => {
                write!(
                    f,
                    "missing required modifier `{name}` for component at byte index {index}"
                )
            }
            Expected {
                what: expected,
                index,
            } => {
                write!(f, "expected {expected} at byte index {index}")
            }
            NotSupported {
                what,
                context,
                index,
            } => {
                write!(
                    f,
                    "{what} is not supported in {context} at byte index {index}"
                )
            }
        }
    }
}

#[cfg(feature = "std")]
impl std::error::Error for InvalidFormatDescription {}