Enum lrpar::LexParseError

pub enum LexParseError<StorageT: Hash> {
    LexError(LexError),
    ParseError(ParseError<StorageT>),
}

A lexing or parsing error. Although the two are quite distinct in terms of what can be reported to users, both can (at least conceptually) occur at any point of the intertwined lexing/parsing process.

Variants

LexError(LexError)

ParseError(ParseError<StorageT>)

Implementations

impl<StorageT: Hash + PrimInt + Unsigned> LexParseError<StorageT>

pub fn pp<'a>(
    &self,
    lexer: &dyn NonStreamingLexer<'_, StorageT>,
    epp: &dyn Fn(TIdx<StorageT>) -> Option<&'a str>
) -> String

A pretty-printer of a lexer/parser error. This isn't suitable for all purposes, but it's often good enough. The output format is not guaranteed to be stable but is likely to be of the form:

Parsing error at line 3 column 8. Repair sequences found:
  1: Insert ID
  2: Delete +, Shift 3

If you are using the compile-time parse system, your grm_y module exposes a suitable epp function; if you are using the run-time system, YaccGrammar exposes a suitable epp function, though you will have to wrap it in a closure e.g. &|t| grm.token_epp(t).

Trait Implementations

impl<StorageT: Debug + Hash> Debug for LexParseError<StorageT>

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

Formats the value using the given formatter.

impl<StorageT: Debug + Hash> Display for LexParseError<StorageT>

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

Formats the value using the given formatter.

impl<StorageT: Debug + Hash> Error for LexParseError<StorageT>

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

The lower-level source of this error, if any.

pub fn backtrace(&self) -> Option<&Backtrace>

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

Returns a stack backtrace, if available, of where this error occurred.

pub fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

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

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl<StorageT: Hash> From<LexError> for LexParseError<StorageT>

fn from(err: LexError) -> LexParseError<StorageT>

Performs the conversion.

impl<StorageT: Hash> From<ParseError<StorageT>> for LexParseError<StorageT>

fn from(err: ParseError<StorageT>) -> LexParseError<StorageT>

Performs the conversion.