Enum parser_compose::Reason

#[non_exhaustive]
pub enum Reason {
    PredicateFailed,
    NotFailed,
    NotEndOfInput,
    EndOfInput,
    Mismatch(String),
    Error(String),
    Label(&'static str),
}

The reason parsing failed

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.

PredicateFailed

A predicate evaluated to false

NotFailed

The not combinator failed

NotEndOfInput

Expected to see the end of input, but didn’t

EndOfInput

Expected more input, but saw the end of input

Mismatch(String)

The Debug representation of what we expected to find in the input.

Error(String)

The description of an operation that failed while parsing. Only .and_then() uses this reason

Label(&'static str)

A user-provided label describing the item we tried and failed to parse. Only .label() uses this reason

Trait Implementations

impl Debug for Reason

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

Formats the value using the given formatter.

impl Display for Reason

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

Formats the value using the given formatter.

impl Ord for Reason

fn cmp(&self, other: &Reason) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Reason

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Reason

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Eq for Reason

impl StructuralEq for Reason

impl StructuralPartialEq for Reason