/rust/registry/src/index.crates.io-1949cf8c6b5b557f/uuid-1.14.0/src/error.rs

Source
use crate::std::fmt;

/// A general error that can occur when working with UUIDs.
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct Error(pub(crate) ErrorKind);

#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub(crate) enum ErrorKind {
    /// Invalid character in the [`Uuid`] string.
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    Char { character: char, index: usize },
    /// A simple [`Uuid`] didn't contain 32 characters.
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    SimpleLength { len: usize },
    /// A byte array didn't contain 16 bytes
    ByteLength { len: usize },
    /// A hyphenated [`Uuid`] didn't contain 5 groups
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    GroupCount { count: usize },
    /// A hyphenated [`Uuid`] had a group that wasn't the right length
    ///
    /// [`Uuid`]: ../struct.Uuid.html
    GroupLength {
        group: usize,
        len: usize,
        index: usize,
    },
    /// The input was not a valid UTF8 string
    InvalidUTF8,
    /// The UUID is nil.
    Nil,
    /// Some other error occurred.
    Other,
}

/// A string that is guaranteed to fail to parse to a [`Uuid`].
///
/// This type acts as a lightweight error indicator, suggesting
/// that the string cannot be parsed but offering no error
/// details. To get details, use `InvalidUuid::into_err`.
///
/// [`Uuid`]: ../struct.Uuid.html
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct InvalidUuid<'a>(pub(crate) &'a [u8]);

impl<'a> InvalidUuid<'a> {
    /// Converts the lightweight error type into detailed diagnostics.
    pub fn into_err(self) -> Error {
        // Check whether or not the input was ever actually a valid UTF8 string
        let input_str = match std::str::from_utf8(self.0) {
            Ok(s) => s,
            Err(_) => return Error(ErrorKind::InvalidUTF8),
        };

        let (uuid_str, offset, simple) = match input_str.as_bytes() {
            [b'{', s @ .., b'}'] => (s, 1, false),
            [b'u', b'r', b'n', b':', b'u', b'u', b'i', b'd', b':', s @ ..] => {
                (s, "urn:uuid:".len(), false)
            }
            s => (s, 0, true),
        };

        let mut hyphen_count = 0;
        let mut group_bounds = [0; 4];

        // SAFETY: the byte array came from a valid utf8 string,
        // and is aligned along char boundaries.
        let uuid_str = unsafe { std::str::from_utf8_unchecked(uuid_str) };

        for (index, character) in uuid_str.char_indices() {
            let byte = character as u8;
            if character as u32 - byte as u32 > 0 {
                // Multibyte char
                return Error(ErrorKind::Char {
                    character,
                    index: index + offset + 1,
                });
            } else if byte == b'-' {
                // While we search, also count group breaks
                if hyphen_count < 4 {
                    group_bounds[hyphen_count] = index;
                }
                hyphen_count += 1;
            } else if !byte.is_ascii_hexdigit() {
                // Non-hex char
                return Error(ErrorKind::Char {
                    character: byte as char,
                    index: index + offset + 1,
                });
            }
        }

        if hyphen_count == 0 && simple {
            // This means that we tried and failed to parse a simple uuid.
            // Since we verified that all the characters are valid, this means
            // that it MUST have an invalid length.
            Error(ErrorKind::SimpleLength {
                len: input_str.len(),
            })
        } else if hyphen_count != 4 {
            // We tried to parse a hyphenated variant, but there weren't
            // 5 groups (4 hyphen splits).
            Error(ErrorKind::GroupCount {
                count: hyphen_count + 1,
            })
        } else {
            // There are 5 groups, one of them has an incorrect length
            const BLOCK_STARTS: [usize; 5] = [0, 9, 14, 19, 24];
            for i in 0..4 {
                if group_bounds[i] != BLOCK_STARTS[i + 1] - 1 {
                    return Error(ErrorKind::GroupLength {
                        group: i,
                        len: group_bounds[i] - BLOCK_STARTS[i],
                        index: offset + BLOCK_STARTS[i] + 1,
                    });
                }
            }

            // The last group must be too long
            Error(ErrorKind::GroupLength {
                group: 4,
                len: input_str.len() - BLOCK_STARTS[4],
                index: offset + BLOCK_STARTS[4] + 1,
            })
        }
    }
}

// NOTE: This impl is part of the public API. Breaking changes to it should be carefully considered
impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self.0 {
            ErrorKind::Char {
                character, index, ..
            } => {
                write!(f, "invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `{}` at {}", character, index)
            }
            ErrorKind::SimpleLength { len } => {
                write!(
                    f,
                    "invalid length: expected length 32 for simple format, found {}",
                    len
                )
            }
            ErrorKind::ByteLength { len } => {
                write!(f, "invalid length: expected 16 bytes, found {}", len)
            }
            ErrorKind::GroupCount { count } => {
                write!(f, "invalid group count: expected 5, found {}", count)
            }
            ErrorKind::GroupLength { group, len, .. } => {
                let expected = [8, 4, 4, 4, 12][group];
                write!(
                    f,
                    "invalid group length in group {}: expected {}, found {}",
                    group, expected, len
                )
            }
            ErrorKind::InvalidUTF8 => write!(f, "non-UTF8 input"),
            ErrorKind::Nil => write!(f, "the UUID is nil"),
            ErrorKind::Other => write!(f, "failed to parse a UUID"),
        }
    }
}

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

    impl error::Error for Error {}
}

Line	Count	Source
1		use crate::std::fmt;
2
3		/// A general error that can occur when working with UUIDs.
4		#[derive(Clone, Debug, Eq, Hash, PartialEq)]
5		pub struct Error(pub(crate) ErrorKind);
6
7		#[derive(Clone, Debug, Eq, Hash, PartialEq)]
8		pub(crate) enum ErrorKind {
9		/// Invalid character in the [`Uuid`] string.
10		///
11		/// [`Uuid`]: ../struct.Uuid.html
12		Char { character: char, index: usize },
13		/// A simple [`Uuid`] didn't contain 32 characters.
14		///
15		/// [`Uuid`]: ../struct.Uuid.html
16		SimpleLength { len: usize },
17		/// A byte array didn't contain 16 bytes
18		ByteLength { len: usize },
19		/// A hyphenated [`Uuid`] didn't contain 5 groups
20		///
21		/// [`Uuid`]: ../struct.Uuid.html
22		GroupCount { count: usize },
23		/// A hyphenated [`Uuid`] had a group that wasn't the right length
24		///
25		/// [`Uuid`]: ../struct.Uuid.html
26		GroupLength {
27		group: usize,
28		len: usize,
29		index: usize,
30		},
31		/// The input was not a valid UTF8 string
32		InvalidUTF8,
33		/// The UUID is nil.
34		Nil,
35		/// Some other error occurred.
36		Other,
37		}
38
39		/// A string that is guaranteed to fail to parse to a [`Uuid`].
40		///
41		/// This type acts as a lightweight error indicator, suggesting
42		/// that the string cannot be parsed but offering no error
43		/// details. To get details, use `InvalidUuid::into_err`.
44		///
45		/// [`Uuid`]: ../struct.Uuid.html
46		#[derive(Clone, Debug, Eq, Hash, PartialEq)]
47		pub struct InvalidUuid<'a>(pub(crate) &'a [u8]);
48
49		impl<'a> InvalidUuid<'a> {
50		/// Converts the lightweight error type into detailed diagnostics.
51	0	pub fn into_err(self) -> Error {
52		// Check whether or not the input was ever actually a valid UTF8 string
53	0	let input_str = match std::str::from_utf8(self.0) {
54	0	Ok(s) => s,
55	0	Err(_) => return Error(ErrorKind::InvalidUTF8),
56		};
57
58	0	let (uuid_str, offset, simple) = match input_str.as_bytes() {
59	0	[b'{', s @ .., b'}'] => (s, 1, false),
60	0	[b'u', b'r', b'n', b':', b'u', b'u', b'i', b'd', b':', s @ ..] => {
61	0	(s, "urn:uuid:".len(), false)
62		}
63	0	s => (s, 0, true),
64		};
65
66	0	let mut hyphen_count = 0;
67	0	let mut group_bounds = [0; 4];
68
69		// SAFETY: the byte array came from a valid utf8 string,
70		// and is aligned along char boundaries.
71	0	let uuid_str = unsafe { std::str::from_utf8_unchecked(uuid_str) };
72
73	0	for (index, character) in uuid_str.char_indices() {
74	0	let byte = character as u8;
75	0	if character as u32 - byte as u32 > 0 {
76		// Multibyte char
77	0	return Error(ErrorKind::Char {
78	0	character,
79	0	index: index + offset + 1,
80	0	});
81	0	} else if byte == b'-' {
82		// While we search, also count group breaks
83	0	if hyphen_count < 4 {
84	0	group_bounds[hyphen_count] = index;
85	0	}
86	0	hyphen_count += 1;
87	0	} else if !byte.is_ascii_hexdigit() {
88		// Non-hex char
89	0	return Error(ErrorKind::Char {
90	0	character: byte as char,
91	0	index: index + offset + 1,
92	0	});
93	0	}
94		}
95
96	0	if hyphen_count == 0 && simple {
97		// This means that we tried and failed to parse a simple uuid.
98		// Since we verified that all the characters are valid, this means
99		// that it MUST have an invalid length.
100	0	Error(ErrorKind::SimpleLength {
101	0	len: input_str.len(),
102	0	})
103	0	} else if hyphen_count != 4 {
104		// We tried to parse a hyphenated variant, but there weren't
105		// 5 groups (4 hyphen splits).
106	0	Error(ErrorKind::GroupCount {
107	0	count: hyphen_count + 1,
108	0	})
109		} else {
110		// There are 5 groups, one of them has an incorrect length
111		const BLOCK_STARTS: [usize; 5] = [0, 9, 14, 19, 24];
112	0	for i in 0..4 {
113	0	if group_bounds[i] != BLOCK_STARTS[i + 1] - 1 {
114	0	return Error(ErrorKind::GroupLength {
115	0	group: i,
116	0	len: group_bounds[i] - BLOCK_STARTS[i],
117	0	index: offset + BLOCK_STARTS[i] + 1,
118	0	});
119	0	}
120		}
121
122		// The last group must be too long
123	0	Error(ErrorKind::GroupLength {
124	0	group: 4,
125	0	len: input_str.len() - BLOCK_STARTS[4],
126	0	index: offset + BLOCK_STARTS[4] + 1,
127	0	})
128		}
129	0	}
130		}
131
132		// NOTE: This impl is part of the public API. Breaking changes to it should be carefully considered
133		impl fmt::Display for Error {
134	0	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
135	0	match self.0 {
136		ErrorKind::Char {
137	0	character, index, ..
138		} => {
139	0	write!(f, "invalid character: expected an optional prefix of `urn:uuid:` followed by [0-9a-fA-F-], found `{}` at {}", character, index)
140		}
141	0	ErrorKind::SimpleLength { len } => {
142	0	write!(
143	0	f,
144	0	"invalid length: expected length 32 for simple format, found {}",
145		len
146		)
147		}
148	0	ErrorKind::ByteLength { len } => {
149	0	write!(f, "invalid length: expected 16 bytes, found {}", len)
150		}
151	0	ErrorKind::GroupCount { count } => {
152	0	write!(f, "invalid group count: expected 5, found {}", count)
153		}
154	0	ErrorKind::GroupLength { group, len, .. } => {
155	0	let expected = [8, 4, 4, 4, 12][group];
156	0	write!(
157	0	f,
158	0	"invalid group length in group {}: expected {}, found {}",
159		group, expected, len
160		)
161		}
162	0	ErrorKind::InvalidUTF8 => write!(f, "non-UTF8 input"),
163	0	ErrorKind::Nil => write!(f, "the UUID is nil"),
164	0	ErrorKind::Other => write!(f, "failed to parse a UUID"),
165		}
166	0	}
167		}
168
169		#[cfg(feature = "std")]
170		mod std_support {
171		use super::*;
172		use crate::std::error;
173
174		impl error::Error for Error {}
175		}

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Created: 2025-11-16 06:37