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//! And combinator
use crate::{Pipe, Result};
use std::marker::PhantomData;
use tuplify::{Extend, HList};
/// Combinator that chains 2 pipes together
pub trait AndExt<I, O, E, R> {
/// Chains 2 [`Pipe`]s one after another
///
/// The 2 output are combined into a single [`HList`]
///
/// Example:
/// ```rust
/// # use fatal_error::FatalError;
/// # use pipe_chain::{Pipe, AndExt, AndThenExt, 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(tag("bar")).apply("foobar"),
/// Ok(("", ("foo", "bar")))
/// );
///
/// assert_eq!(
/// tag::<Error, _, _>("foo").and(tag("boo")).apply("foobar"),
/// Err(FatalError::Error(Error::Tag(TagStrError("boo".into(), "bar".into()))))
/// );
///
/// assert_eq!(
/// tag::<Error, _, _>("foo").and(tag("boo")).apply("foobo"),
/// Err(FatalError::Error(Error::Incomplete(Incomplete::Size(1))))
/// );
/// ```
fn and<O2, R2, P>(self, p: P) -> And<Self, P, O, O2, R>
where
Self: Sized,
O: Extend<O2>,
O2: HList,
P: Pipe<R, O2, E, R2>,
{
And::new(self, p)
}
/// Chains 2 [`Pipe`]s one after another
///
/// Only the output of the second pipe is returned
///
/// Example:
/// ```rust
/// # use fatal_error::FatalError;
/// # use pipe_chain::{Pipe, AndExt, AndThenExt, 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_other(tag("bar")).apply("foobar"),
/// Ok(("", ("bar",)))
/// );
/// ```
fn and_other<O2, R2, P>(self, p: P) -> AndOther<Self, P, O, R>
where
Self: Sized,
P: Pipe<R, O2, E, R2>,
{
AndOther::new(self, p)
}
/// Chains 2 [`Pipe`]s one after another
///
/// Only the output of the first pipe is returned
///
/// Example:
/// ```rust
/// # use fatal_error::FatalError;
/// # use pipe_chain::{Pipe, AndExt, AndThenExt, 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_self(tag("bar")).apply("foobar"),
/// Ok(("", ("foo",)))
/// );
/// ```
fn and_self<O2, R2, P>(self, other: P) -> AndSelf<Self, P, R, O2>
where
Self: Sized,
P: Pipe<R, O2, E, R2>,
{
AndSelf::new(self, other)
}
}
impl<I, O, E, R, P> AndExt<I, O, E, R> for P where P: Pipe<I, O, E, R> {}
/// [AndExt::and] implementation
pub struct And<P, P1, O, O2, R> {
p: P,
p1: P1,
_o: PhantomData<O>,
_o2: PhantomData<O2>,
_r: PhantomData<R>,
}
impl<P, P1, O, O2, R> And<P, P1, O, O2, R> {
fn new(p: P, p1: P1) -> Self {
Self { p, p1, _o: PhantomData, _o2: PhantomData, _r: PhantomData }
}
}
impl<I, O, O2, E, R, R2, P, P1> Pipe<I, O::Output, E, R2> for And<P, P1, O, O2, R>
where
O: Extend<O2>,
O2: HList,
P: Pipe<I, O, E, R>,
P1: Pipe<R, O2, E, R2>,
{
fn apply(&mut self, input: I) -> Result<R2, O::Output, E> {
let (i, o) = self.p.apply(input)?;
self.p1.apply(i).map(|(i, o2)| (i, o.extend(o2)))
}
}
/// [AndExt::and_other] implementation
pub struct AndOther<P1, P2, O, R>(P1, P2, PhantomData<O>, PhantomData<R>);
impl<P1, P2, O, R> AndOther<P1, P2, O, R> {
fn new(p: P1, p1: P2) -> AndOther<P1, P2, O, R> {
AndOther(p, p1, PhantomData, PhantomData)
}
}
impl<I, O, E, R, O2, R2, P1, P2> Pipe<I, O2, E, R2> for AndOther<P1, P2, O, R>
where
P1: Pipe<I, O, E, R>,
P2: Pipe<R, O2, E, R2>,
{
fn apply(&mut self, input: I) -> Result<R2, O2, E> {
self.0.apply(input).and_then(|(i, _)| self.1.apply(i).map(|(i, o)| (i, o)))
}
}
/// [AndExt::and_self] implementation
pub struct AndSelf<P1, P2, R, O2>(P1, P2, PhantomData<R>, PhantomData<O2>);
impl<P1, P2, R, O2> AndSelf<P1, P2, R, O2> {
fn new(p: P1, p1: P2) -> AndSelf<P1, P2, R, O2> {
AndSelf(p, p1, PhantomData, PhantomData)
}
}
impl<I, O, E, R, O2, R2, P1, P2> Pipe<I, O, E, R2> for AndSelf<P1, P2, R, O2>
where
P1: Pipe<I, O, E, R>,
P2: Pipe<R, O2, E, R2>,
{
fn apply(&mut self, input: I) -> Result<R2, O, E> {
self.0.apply(input).and_then(|(i, o)| self.1.apply(i).map(|(i, _)| (i, o)))
}
}