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ParseError

Enum ParseError 

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pub enum ParseError {
    UnexpectedToken {
        found: TokenKind,
        expected: Vec<TokenKind>,
        span: Span,
    },
    UnexpectedEof {
        expected: Vec<TokenKind>,
        span: Span,
    },
    LexerError {
        message: String,
        span: Span,
    },
}
Expand description

Domaenenspezifische Parser-Fehler.

Wird vom Lexer (Woche 2), Recognizer (spaetere Anbindung), CST-Builder und AST-Builder konsumiert. Jede Variante laesst sich via ParseError::to_diagnostic in eine Diagnostic ueberfuehren.

Variants§

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UnexpectedToken

Erwartet wurde eine bestimmte Token-Menge, gefunden wurde ein anderes Token.

Fields

§found: TokenKind

Was tatsaechlich gelesen wurde.

§expected: Vec<TokenKind>

Welche Tokens erwartet waren (aus dem Earley-Expected-Set).

§span: Span

Position des unerwarteten Tokens.

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UnexpectedEof

Eingabe endete vor Abschluss der Production. Erwartet wurde noch mindestens ein Token.

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§expected: Vec<TokenKind>

Was an dieser Stelle erwartet war.

§span: Span

Endposition der Eingabe.

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LexerError

Lexer-spezifischer Fehler (ungueltige Zeichen-Sequenz, unterminated String, etc.). Detail-Text ist lexer-spezifisch.

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§message: String

Beschreibung des Lexer-Problems.

§span: Span

Position der fehlerhaften Sequenz.

Implementations§

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impl ParseError

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pub fn to_diagnostic(&self) -> Diagnostic

Konvertiert einen Parser-Fehler in eine uniforme Diagnostic.

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pub const fn span(&self) -> Span

Position des Fehlers im Source-Text.

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impl Clone for ParseError

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fn clone(&self) -> ParseError

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for ParseError

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

Formats the value using the given formatter. Read more
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impl From<ParseError> for Error

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fn from(e: ParseError) -> Self

Converts to this type from the input type.
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impl PartialEq for ParseError

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

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

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

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

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impl StructuralPartialEq for ParseError

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.