Enum ParseError 

#[non_exhaustive]
pub enum ParseError {
    EmptyInput,
    InvalidTriple(Box<Triple>),
    AmbiguousType {
        predicate: String,
        candidates: Vec<String>,
    },
}

An error produced while parsing a phrase into a triple.

Marked #[non_exhaustive]: match with a wildcard arm so future variants do not break your build.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

EmptyInput

The supplied text was empty or whitespace-only and could not be parsed. Ports the "could not be parsed into a triple" throw in parse.js.

InvalidTriple(Box<Triple>)

The parsed triple is not valid in either direction against the grammar. Ports the "Invalid triple" throw in rules-processor.js. The triple is boxed to keep Result<Triple, ParseError> small on the common Ok path.

AmbiguousType

A phrase omitted an entity type, and the matched predicate maps to more than one candidate type in the grammar, so the type cannot be inferred unambiguously. Only returned under crate::Ambiguity::Error.

Fields

predicate: String

The predicate whose subject/object type was ambiguous.

candidates: Vec<String>

The candidate types, in grammar declaration order.

Trait Implementations

impl Clone for ParseError

fn clone(&self) -> ParseError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParseError

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

Formats the value using the given formatter.

impl Display for ParseError

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

Formats the value using the given formatter.

impl Error for ParseError

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 PartialEq for ParseError

fn eq(&self, other: &ParseError) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ParseError

impl StructuralPartialEq for ParseError