Struct pest::error::Error

source ·

pub struct Error<R> {
    pub variant: ErrorVariant<R>,
    pub location: InputLocation,
    pub line_col: LineColLocation,
    /* private fields */
}

Expand description

Parse-related error type.

Fields§

§variant: ErrorVariant<R>

Variant of the error

§location: InputLocation

Location within the input string

§line_col: LineColLocation

Line/column within the input string

Implementations§

source §

impl<R: RuleType> Error<R>

source

pub fn new_from_pos(variant: ErrorVariant<R>, pos: Position<'_>) -> Error<R>

Creates Error from ErrorVariant and Position.

Examples

let error = Error::new_from_pos(
    ErrorVariant::ParsingError {
        positives: vec![Rule::open_paren],
        negatives: vec![Rule::closed_paren]
    },
    pos
);

println!("{}", error);

Examples found in repository ?

src/parser_state.rs (lines 178-182)

pub fn state<'i, R: RuleType, F>(input: &'i str, f: F) -> Result<pairs::Pairs<'i, R>, Error<R>>
where
    F: FnOnce(Box<ParserState<'i, R>>) -> ParseResult<Box<ParserState<'i, R>>>,
{
    let state = ParserState::new(input);

    match f(state) {
        Ok(state) => {
            let len = state.queue.len();
            Ok(pairs::new(Rc::new(state.queue), input, 0, len))
        }
        Err(mut state) => {
            let variant = if state.reached_call_limit() {
                ErrorVariant::CustomError {
                    message: "call limit reached".to_owned(),
                }
            } else {
                state.pos_attempts.sort();
                state.pos_attempts.dedup();
                state.neg_attempts.sort();
                state.neg_attempts.dedup();
                ErrorVariant::ParsingError {
                    positives: state.pos_attempts.clone(),
                    negatives: state.neg_attempts.clone(),
                }
            };

            Err(Error::new_from_pos(
                variant,
                // TODO(performance): Guarantee state.attempt_pos is a valid position
                position::Position::new(input, state.attempt_pos).unwrap(),
            ))
        }
    }
}

source

pub fn new_from_span(variant: ErrorVariant<R>, span: Span<'_>) -> Error<R>

Creates Error from ErrorVariant and Span.

Examples

let error = Error::new_from_span(
    ErrorVariant::ParsingError {
        positives: vec![Rule::open_paren],
        negatives: vec![Rule::closed_paren]
    },
    span
);

println!("{}", error);

source

pub fn with_path(self, path: &str) -> Error<R>

Returns Error variant with path which is shown when formatted with Display.

Examples

Error::new_from_pos(
    ErrorVariant::ParsingError {
        positives: vec![Rule::open_paren],
        negatives: vec![Rule::closed_paren]
    },
    pos
).with_path("file.rs");

source

pub fn path(&self) -> Option<&str>

Returns the path set using Error::with_path().

Examples

let error = error.with_path("file.rs");
assert_eq!(Some("file.rs"), error.path());

source

pub fn line(&self) -> &str

Returns the line that the error is on.

source

pub fn renamed_rules<F>(self, f: F) -> Error<R>where
F: FnMut(&R) -> String,

Renames all Rules if this is a ParsingError. It does nothing when called on a CustomError.

Useful in order to rename verbose rules or have detailed per-Rule formatting.

Examples

Error::new_from_pos(
    ErrorVariant::ParsingError {
        positives: vec![Rule::open_paren],
        negatives: vec![Rule::closed_paren]
    },
    pos
).renamed_rules(|rule| {
    match *rule {
        Rule::open_paren => "(".to_owned(),
        Rule::closed_paren => "closed paren".to_owned()
    }
});