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use crate::{Pipe, Result};
use std::marker::PhantomData;
/// Combinator that discards output
pub trait SkipExt<I, O, E, R> {
/// Discards the output of the pipe
///
/// Example:
/// ```
/// # use fatal_error::FatalError;
/// # use pipe_chain::{Pipe, SkipExt, tag, str::TagStrError, Incomplete};
/// # use std::error::Error as StdError;
/// # #[derive(Debug, PartialEq, Eq)]
/// # enum Error {
/// # Incomplete(Incomplete),
/// # Tag(TagStrError),
/// # }
/// #
/// # impl std::fmt::Display for Error {
/// # fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
/// # write!(f, "{self:?}")
/// # }
/// # }
/// # impl StdError for Error {}
/// #
/// # impl From<Incomplete> for Error {
/// # fn from(value: Incomplete) -> Error { Error::Incomplete(value) }
/// # }
/// #
/// # impl From<TagStrError> for Error {
/// # fn from(value: TagStrError) -> Error { Error::Tag(value) }
/// # }
/// assert_eq!(tag::<Error, _, _>("foo").skip().apply("foobar"), Ok(("bar", ())));
///
/// assert_eq!(
/// tag::<Error, _, _>("foo").skip().apply("something"),
/// Err(FatalError::Error(Error::Tag(TagStrError("foo".into(), "som".into()))))
/// );
/// ```
fn skip(self) -> Skip<Self, O>
where
Self: Sized,
{
Skip::new(self)
}
/// Chains 2 [`Pipe`]s one after another both output are discarded
///
/// Example:
/// ```
/// # use fatal_error::FatalError;
/// # use pipe_chain::{Pipe, SkipExt, tag, str::TagStrError, Incomplete};
/// # use std::error::Error as StdError;
/// # #[derive(Debug, PartialEq, Eq)]
/// # enum Error {
/// # Incomplete(Incomplete),
/// # Tag(TagStrError),
/// # }
/// #
/// # impl std::fmt::Display for Error {
/// # fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
/// # write!(f, "{self:?}")
/// # }
/// # }
/// # impl StdError for Error {}
/// #
/// # impl From<Incomplete> for Error {
/// # fn from(value: Incomplete) -> Error { Error::Incomplete(value) }
/// # }
/// #
/// # impl From<TagStrError> for Error {
/// # fn from(value: TagStrError) -> Error { Error::Tag(value) }
/// # }
/// assert_eq!(
/// tag::<Error, _, _>("foo").and_skip(tag("bar")).apply("foobar"),
/// Ok(("", ()))
/// );
///
/// assert_eq!(
/// tag::<Error, _, _>("foo").and_skip(tag("boo")).apply("something"),
/// Err(FatalError::Error(Error::Tag(TagStrError("foo".into(), "som".into()))))
/// );
/// ```
fn and_skip<O2, R2, P>(self, other: P) -> AndSkip<Self, P, O, O2, R>
where
Self: Sized,
P: Pipe<R, O2, E, R2>,
{
AndSkip::new(self, other)
}
/// Apply the second [Pipe] if the first fails discarding both output
///
/// Example:
/// ```
/// # use fatal_error::FatalError;
/// # use pipe_chain::{Pipe, SkipExt, tag, str::TagStrError, Incomplete};
/// # use std::error::Error as StdError;
/// # #[derive(Debug, PartialEq, Eq)]
/// # enum Error {
/// # Incomplete(Incomplete),
/// # Tag(TagStrError),
/// # }
/// #
/// # impl std::fmt::Display for Error {
/// # fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
/// # write!(f, "{self:?}")
/// # }
/// # }
/// # impl StdError for Error {}
/// #
/// # impl From<Incomplete> for Error {
/// # fn from(value: Incomplete) -> Error { Error::Incomplete(value) }
/// # }
/// #
/// # impl From<TagStrError> for Error {
/// # fn from(value: TagStrError) -> Error { Error::Tag(value) }
/// # }
/// assert_eq!(tag::<Error, _, _>("foo").or_skip(tag("bar")).apply("foo"), Ok(("", ())));
///
/// assert_eq!(tag::<Error, _, _>("foo").or_skip(tag("boo")).apply("boo"), Ok(("", ())));
///
/// assert_eq!(
/// tag::<Error, _, _>("foo").or_skip(tag("boo")).apply("something"),
/// Err(FatalError::Error(Error::Tag(TagStrError("boo".into(), "som".into()))))
/// );
/// ```
fn or_skip<O2, P>(self, p: P) -> OrSkip<O, O2, Self, P>
where
Self: Sized,
I: Clone,
P: Pipe<I, O2, E, R>,
{
OrSkip::new(self, p)
}
}
impl<I, O, E, R, P> SkipExt<I, O, E, R> for P where P: Pipe<I, O, E, R> {}
/// [SkipExt::skip] implementation
pub struct Skip<P, O> {
p: P,
o: PhantomData<O>,
}
impl<P, O> Skip<P, O> {
fn new(p: P) -> Self { Self { p, o: PhantomData } }
}
impl<I, I2, O, E, P> Pipe<I, (), E, I2> for Skip<P, O>
where
P: Pipe<I, O, E, I2>,
{
fn apply(&mut self, input: I) -> Result<I2, (), E> {
self.p.apply(input).map(|x| (x.0, ()))
}
}
/// [SkipExt::and_skip] implementation
pub struct AndSkip<P1, P2, O, O2, R>(
P1,
P2,
PhantomData<O>,
PhantomData<O2>,
PhantomData<R>,
);
impl<P1, P2, O, O2, R> AndSkip<P1, P2, O, O2, R> {
fn new(p: P1, p1: P2) -> AndSkip<P1, P2, O, O2, R> {
AndSkip(p, p1, PhantomData, PhantomData, PhantomData)
}
}
impl<I, O, E, R, O2, R2, P1, P2> Pipe<I, (), E, R2> for AndSkip<P1, P2, O, O2, R>
where
P1: Pipe<I, O, E, R>,
P2: Pipe<R, O2, E, R2>,
{
fn apply(&mut self, input: I) -> Result<R2, (), E> {
self.0.apply(input).and_then(|(i, _)| self.1.apply(i).map(|(i, _)| (i, ())))
}
}
/// [SkipExt::or_skip] implementation
pub struct OrSkip<O, O2, P, P1> {
p: P,
p1: P1,
o: PhantomData<O>,
o2: PhantomData<O2>,
}
impl<O, O2, P, P1> OrSkip<O, O2, P, P1> {
fn new(p: P, p1: P1) -> Self { Self { p, p1, o: PhantomData, o2: PhantomData } }
}
impl<I, O, O2, E, R, P, P1> Pipe<I, (), E, R> for OrSkip<O, O2, P, P1>
where
P: Pipe<I, O, E, R>,
P1: Pipe<I, O2, E, R>,
I: Clone,
{
fn apply(&mut self, input: I) -> Result<R, (), E> {
match self.p.apply(input.clone()).map(|(x, _)| (x, ())) {
x @ Ok(_) => x,
Err(x) => {
x.fatality()?;
self.p1.apply(input).map(|(x, _)| (x, ()))
}
}
}
}