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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

use crate::std::fmt;

/// An error that can occur while parsing a [`Uuid`] string.
///
/// [`Uuid`]: ../struct.Uuid.html
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
#[allow(clippy::enum_variant_names)]
pub(crate) enum Error {
    /// Invalid character in the [`Uuid`] string.
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    InvalidCharacter {
        /// The expected characters.
        expected: &'static str,
        /// The invalid character found.
        found: char,
        /// The invalid character position.
        index: usize,
        /// Indicates the [`Uuid`] starts with `urn:uuid:`.
        ///
        /// This is a special case for [`Urn`] adapter parsing.
        ///
        /// [`Uuid`]: ../Uuid.html
        urn: UrnPrefix,
    },
    /// Invalid number of segments in the [`Uuid`] string.
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    InvalidGroupCount {
        /// The expected number of segments.
        // TODO: explain multiple segment count.
        // BODY: Parsers can expect a range of Uuid segment count.
        //       This needs to be expanded on.
        expected: ExpectedLength,
        /// The number of segments found.
        found: usize,
    },
    /// Invalid length of a segment in a [`Uuid`] string.
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    InvalidGroupLength {
        /// The expected length of the segment.
        expected: ExpectedLength,
        /// The length of segment found.
        found: usize,
        /// The segment with invalid length.
        group: usize,
    },
    /// Invalid length of the [`Uuid`] string.
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    InvalidLength {
        /// The expected length(s).
        // TODO: explain multiple lengths.
        // BODY: Parsers can expect a range of Uuid lenghts.
        //       This needs to be expanded on.
        expected: ExpectedLength,
        /// The invalid length found.
        found: usize,
    },
}

/// The expected length.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub(crate) enum ExpectedLength {
    /// Expected any one of the given values.
    Any(&'static [usize]),
    /// Expected the given value.
    Exact(usize),
}

/// Urn prefix value.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub(crate) enum UrnPrefix {
    /// The `urn:uuid:` prefix should optionally provided.
    Optional,
}

impl Error {
    fn _description(&self) -> &str {
        match *self {
            Error::InvalidCharacter { .. } => "invalid character",
            Error::InvalidGroupCount { .. } => "invalid number of groups",
            Error::InvalidGroupLength { .. } => "invalid group length",
            Error::InvalidLength { .. } => "invalid length",
        }
    }
}

impl fmt::Display for ExpectedLength {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match *self {
            ExpectedLength::Any(crits) => write!(f, "one of {:?}", crits),
            ExpectedLength::Exact(crit) => write!(f, "{}", crit),
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}: ", self._description())?;

        match *self {
            Error::InvalidCharacter {
                expected,
                found,
                index,
                urn,
            } => {
                let urn_str = match urn {
                    UrnPrefix::Optional => {
                        " an optional prefix of `urn:uuid:` followed by"
                    }
                };

                write!(
                    f,
                    "expected{} {}, found {} at {}",
                    urn_str, expected, found, index
                )
            }
            Error::InvalidGroupCount {
                ref expected,
                found,
            } => write!(f, "expected {}, found {}", expected, found),
            Error::InvalidGroupLength {
                ref expected,
                found,
                group,
            } => write!(
                f,
                "expected {}, found {} in group {}",
                expected, found, group,
            ),
            Error::InvalidLength {
                ref expected,
                found,
            } => write!(f, "expected {}, found {}", expected, found),
        }
    }
}

#[cfg(feature = "std")]
mod std_support {
    use super::*;
    use crate::std::error;

    impl error::Error for Error {}
}