Enum GrammarError 

pub enum GrammarError {
    ParseError {
        pos: usize,
        msg: String,
    },
    Stuck,
    UnknownRule {
        rule: String,
    },
    RecursionLimit {
        rule: String,
    },
}

Errors that can occur during grammar parsing or state machine execution.

Variants

ParseError

Syntax error during GBNF grammar parsing.

Fields

pos: usize

Byte offset in the input where the error occurred.

msg: String

Human-readable description.

Stuck

Grammar state machine reached a dead state — no valid next tokens exist.

UnknownRule

A rule reference in the grammar points to a rule that was never defined.

Fields

rule: String

The missing rule name.

RecursionLimit

Recursion depth limit exceeded during grammar simulation.

Fields

rule: String

Rule that was being evaluated.

Trait Implementations

impl Clone for GrammarError

fn clone(&self) -> GrammarError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GrammarError

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

Formats the value using the given formatter.

impl Display for GrammarError

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

Formats the value using the given formatter.

impl Error for GrammarError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<GrammarError> for RuntimeError

fn from(source: GrammarError) -> Self

Converts to this type from the input type.