Enum regex_automata::ErrorKind

pub enum ErrorKind {
    Syntax(String),
    Unsupported(String),
    Serialize(String),
    StateIDOverflow {
        max: usize,
    },
    PremultiplyOverflow {
        max: usize,
        requested_max: usize,
    },
}

The kind of error that occurred.

Variants

Syntax(String)

An error that occurred while parsing a regular expression. Note that this error may be printed over multiple lines, and is generally intended to be end user readable on its own.

Unsupported(String)

An error that occurred because an unsupported regex feature was used. The message string describes which unsupported feature was used.

The primary regex features that are unsupported are those that require look-around, such as the ^ and $ anchors and the word boundary assertion \b. These may be supported in the future.

Serialize(String)

An error that occurred when attempting to serialize a DFA to bytes.

StateIDOverflow

An error that occurs when constructing a DFA would require the use of a state ID that overflows the chosen state ID representation. For example, if one is using u8 for state IDs and builds a DFA with 257 states, then the last state’s ID will be 256 which cannot be represented with u8.

Typically, this error occurs in the determinization process of building a DFA (the conversion step from NFA to DFA). It can also occur when trying to build a smaller DFA from an existing one.

Fields of StateIDOverflow

max: usize

The maximum possible state ID.

PremultiplyOverflow

An error that occurs when premultiplication of state IDs is requested, but doing so would overflow the chosen state ID representation.

When max == requested_max, then the state ID would overflow usize.

Fields of PremultiplyOverflow

max: usize

The maximum possible state id.

requested_max: usize

The maximum ID required by premultiplication.

Trait Implementations

impl Clone for ErrorKind

fn clone(&self) -> ErrorKind

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ErrorKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.