lua_pattern/
error.rs

1use crate::Token;
2
3/// The default result type. The error variant is [`Error`].
4pub type Result<T> = std::result::Result<T, Error>;
5
6/// The crate's main error type.
7#[derive(Debug, thiserror::Error, PartialEq, Eq)]
8pub enum Error {
9    /// The input ended with a single `%` character.
10    #[error("unfinished escape: finish `%` with a class or escape character or use `%%` to match `%` literally")]
11    UnfinishedEscape,
12
13    /// The closing bracket `]` for a [character set](crate::PatternObject::Set) is missing.
14    #[error("missing `]` to close set")]
15    UnclosedSet,
16
17    /// A [balanced pattern `%b`](crate::PatternObject::Balanced) was present without two
18    /// characters following it.
19    #[error("missing characters for `%b` pattern. Example: `%b()`")]
20    MissingCharsForBalanced,
21
22    /// A [frontier pattern `%f`](crate::PatternObject::Frontier) was present without a
23    /// [character set](crate::PatternObject::Set) following it.
24    #[error("missing `[` after `%f` in pattern. Example: `%f[%w]`")]
25    MissingSetForFrontier,
26
27    /// The input contained an unexpected token, such as an extra closing bracket or a
28    /// [quantifier](crate::PatternObject::Quantifier) without a leading
29    /// [pattern](crate::PatternObject).
30    #[error("unexpected token in input: `{0}`")]
31    UnexpectedToken(Token),
32
33    /// A [capture group backreference](crate::PatternObject::CaptureRef) referenced a group that
34    /// does not exist.
35    #[error("reference to unknown capture with id `{0}`")]
36    InvalidCaptureRef(u8),
37
38    /// A [character range](crate::SetPatternObject::Range) in a
39    /// [character set](crate::PatternObject::Set) is missing its upper bound. The given token was
40    /// found instead.
41    #[error("range is open ended: token after `-` was `{0}`")]
42    OpenEndedRange(Token),
43}
lua_pattern/error.rs

lua_pattern/
error.rs
