Struct Cheap 

pub struct Cheap<S = SimpleSpan<usize>> { /* private fields */ }

A very cheap error type that tracks only the error span (SimpleSpan by default). This type is most useful when you want fast parsing but do not particularly care about the quality of error messages.

Examples

use chumsky::prelude::*;

let parser = just::<_, _, extra::Err<Cheap>>("+");
let error = parser.parse("-").into_errors()[0];

assert_eq!(error.span(), &SimpleSpan::new((), 0..1));

Implementations

impl<S> Cheap<S>

pub fn new(span: S) -> Self

Create a new Cheap error.

pub fn span(&self) -> &S

Get the span than that error related to.

If the span type is unspecified, it is SimpleSpan.

Trait Implementations

impl<S: Clone> Clone for Cheap<S>

fn clone(&self) -> Cheap<S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S> Debug for Cheap<S>

where S: Debug,

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

Formats the value using the given formatter.

impl<'de, S> Deserialize<'de> for Cheap<S>

where S: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<S> Display for Cheap<S>

where S: Debug,

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

Formats the value using the given formatter.

impl<'a, I: Input<'a>> Error<'a, I> for Cheap<I::Span>

fn merge(self, other: Self) -> Self

Merge two errors that point to the same input together, combining their information.

impl<S: Hash> Hash for Cheap<S>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a, I: Input<'a>, L> LabelError<'a, I, L> for Cheap<I::Span>

fn expected_found<E: IntoIterator<Item = L>>( _expected: E, _found: Option<MaybeRef<'a, I::Token>>, span: I::Span, ) -> Self

Create a new error describing a conflict between expected inputs and that which was actually found.

fn merge_expected_found<E: IntoIterator<Item = L>>( self, expected: E, found: Option<MaybeRef<'src, I::Token>>, span: I::Span, ) -> Self

where Self: Error<'src, I>,

Fast path for a.merge(LabelError::expected_found(...)) that may incur less overhead by, for example, reusing allocations.

fn replace_expected_found<E: IntoIterator<Item = L>>( self, expected: E, found: Option<MaybeRef<'src, I::Token>>, span: I::Span, ) -> Self

Fast path for a = LabelError::expected_found(...) that may incur less overhead by, for example, reusing allocations.

fn label_with(&mut self, label: L)

Annotate the expected patterns within this parser with the given label.

fn in_context(&mut self, label: L, span: I::Span)

Annotate this error, indicating that it occurred within the context denoted by the given label.

impl<S: Ord> Ord for Cheap<S>

fn cmp(&self, other: &Cheap<S>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<S: PartialEq> PartialEq for Cheap<S>

fn eq(&self, other: &Cheap<S>) -> 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<S: PartialOrd> PartialOrd for Cheap<S>

fn partial_cmp(&self, other: &Cheap<S>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<S> Serialize for Cheap<S>

where S: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<S: Copy> Copy for Cheap<S>

impl<S: Eq> Eq for Cheap<S>

impl<S> StructuralPartialEq for Cheap<S>