Struct Fail

pub struct Fail<I, O>(/* private fields */);

Trait Implementations

impl<S: Stream<Item = I> + ?Sized, I, O> Parser<S> for Fail<I, O>

fn parse_lookahead( &self, _: &mut S, ) -> ParseResult<Option<(Self::Output, Consume)>>

fn parse(&self, stream: &mut S) -> ParseResult<Self::Output>

fn parse_consume(&self, stream: &mut S) -> ParseResult<(Self::Output, Consume)>

impl<I, O> ParserBase for Fail<I, O>

type Input = I

The input type of the parser. u8 for byte-eating parsers.

type Output = O

The output type which this monadic parser produces.

fn emptiable() -> bool

Whether the parser “usually” accepts the empty sequence. Only used in emit_expectations.

fn map_once<O, F>(self, f: F) -> Map<O, Self, F>

where Self: Sized, F: FnOnce(Self::Output) -> O,

Converts a semantic value after parsing. Similar to ParserBase::map, but accepts FnOnce closures.

fn map_mut<O, F>(self, f: F) -> Map<O, Self, F>

where Self: Sized, F: FnMut(Self::Output) -> O,

Converts a semantic value after parsing. Similar to ParserBase::map, but accepts FnMut closures.

fn map<O, F>(self, f: F) -> Map<O, Self, F>

where Self: Sized, F: Fn(Self::Output) -> O,

Converts a semantic value after parsing.

fn and_then_once<P, F>(self, f: F) -> AndThen<Self, P, F>

where Self: Sized, P: ParserBase<Input = Self::Input>, F: FnOnce(Self::Output) -> P,

Monadic operator: run another parser f(x) after parsing. Similar to ParserBase::and_then, but accepts FnOnce closures.

fn and_then_mut<P, F>(self, f: F) -> AndThen<Self, P, F>

where Self: Sized, P: ParserBase<Input = Self::Input>, F: FnMut(Self::Output) -> P,

Monadic operator: run another parser f(x) after parsing. Similar to ParserBase::and_then, but accepts FnMut closures.

fn and_then<P, F>(self, f: F) -> AndThen<Self, P, F>

where Self: Sized, P: ParserBase<Input = Self::Input>, F: Fn(Self::Output) -> P,

Monadic operator: run another parser f(x) after parsing.

fn concat<P>(self, p: P) -> Concat2<Self, P>

where Self: Sized, P: ParserBase<Input = Self::Input>,

Applicative operator: run another parser p after parsing. The result is a pair of the result of the parsers.

fn or<P>(self, p: P) -> Choice2<Self, P>

where Self: Sized, P: ParserBase<Input = Self::Input, Output = Self::Output>,

If the parser failed without consumption, try another parser.

fn many1(self) -> Many1<Self>

where Self: Sized,

Returns a ParserIteratorBase that collects one or more objects from this parser.

impl<S: Stream<Item = I> + ?Sized, I, O> ParserMut<S> for Fail<I, O>

fn parse_lookahead_mut( &mut self, _: &mut S, ) -> ParseResult<Option<(Self::Output, Consume)>>

fn parse_mut(&mut self, stream: &mut S) -> ParseResult<Self::Output>

fn parse_consume_mut( &mut self, stream: &mut S, ) -> ParseResult<(Self::Output, Consume)>

impl<S: Stream<Item = I> + ?Sized, I, O> ParserOnce<S> for Fail<I, O>

fn parse_lookahead_once( self, _: &mut S, ) -> ParseResult<Option<(Self::Output, Consume)>>

fn emit_expectations(&self, _: &mut S)