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//! AndThen combinator
use crate::{Pipe, Result};
use fatal_error::FatalError;
use std::marker::PhantomData;
use tuplify::{FunMut, HList};
/// Combinator that applies a faillible function on the output of a pipe
pub trait AndThenExt<I, O, E, R> {
/// Applies the given closure on the output of the pipe
///
/// the output of both [`Pipe`] and closure and must be an [`HList`]
///
/// ```rust
/// # use pipe_chain::{Pipe, AndExt, AndThenExt, tag, str::TagStrError, Incomplete};
/// # use fatal_error::FatalError;
/// # 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) }
/// # }
/// fn yolo(_: &str, _: &str) -> Result<(u8, u8), FatalError<Error>> { Ok((1, 2)) }
///
/// assert_eq!(
/// tag::<Error, _, _>("1").and(tag("2")).and_then(yolo).apply("12"),
/// Ok(("", (1u8, 2u8)))
/// )
/// ```
fn and_then<O2, F>(self, f: F) -> AndThen<O, Self, F>
where
Self: Sized,
F: FunMut<O, Output = std::result::Result<O2, FatalError<E>>>,
O: HList,
O2: HList,
{
AndThen::new(self, f)
}
/// Applies the given closure on the output of a pipe
///
/// ```rust
/// # 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, _, _>("1")
/// .and(tag("2"))
/// .and_thenf(|(first, second)| Ok(12))
/// .apply("12"),
/// Ok(("", 12))
/// )
/// ```
fn and_thenf<O2, F>(self, f: F) -> AndThenF<O, Self, F>
where
Self: Sized,
F: FnMut(O) -> std::result::Result<O2, FatalError<E>>,
{
AndThenF::new(self, f)
}
/// Applies the given closure to the output and remaining input of a pipe
///
/// ```
/// # use pipe_chain::{Pipe, AndExt, AndThenExt, tag, str::TagStrError, Incomplete, Result, MapExt, OrExt};
/// # 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) }
/// # }
///
/// #[derive(Debug, PartialEq, Eq)]
/// enum FooBar {
/// Foo,
/// Bar,
/// }
///
/// fn true_or_false(input: &str) -> Result<&str, (bool,), Error> {
/// tag("true").map1(|_| true).or(tag("false").map1(|_| false)).apply(input)
/// }
///
/// fn foobar(input: &str) -> Result<&str, (FooBar,), Error> {
/// true_or_false
/// .ok_and_then(|x, (y,)| {
/// if y {
/// tag("bar").map1(|_| FooBar::Bar).apply(x)
/// } else {
/// tag("foo").map1(|_| FooBar::Foo).apply(x)
/// }
/// })
/// .apply(input)
/// }
///
/// assert_eq!(foobar("truebar"), Ok(("", (FooBar::Bar,))));
/// assert_eq!(foobar("falsefoo"), Ok(("", (FooBar::Foo,))));
/// assert_eq!(
/// tag::<Error, _, _>("1")
/// .and(tag("2"))
/// .ok_and_then(|r, (first, second)| Ok(("yolo", (12,))))
/// .apply("12"),
/// Ok(("yolo", (12,)))
/// )
/// ```
fn ok_and_then<O2, R2, F>(self, other: F) -> OkAndThen<O, R, Self, F>
where
Self: Sized,
F: FunMut<(R, O), Output = std::result::Result<(R2, O2), FatalError<E>>>,
{
OkAndThen::new(self, other)
}
/// Applies the pipes consecutively
///
/// the output of both [`Pipe`] and closure and must be an [`HList`]
///
/// ```rust
/// # use pipe_chain::{Pipe, AndExt, AndThenExt, tag, str::TagStrError, Incomplete, MapExt, OrExt, Result};
/// # use fatal_error::FatalError;
/// # 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) }
/// # }
/// #[derive(Debug, PartialEq, Eq)]
/// enum FooBar {
/// Foo,
/// Bar,
/// }
///
/// fn true_or_false(input: &str) -> Result<&str, (bool,), Error> {
/// tag("true").map1(|_| true).or(tag("false").map1(|_| false)).apply(input)
/// }
///
/// fn foobar(input: &str) -> Result<&str, (FooBar,), Error> {
/// true_or_false
/// .ok_then(|(x, (y,))| {
/// if y {
/// tag("bar").map1(|_| FooBar::Bar).apply(x)
/// } else {
/// tag("foo").map1(|_| FooBar::Foo).apply(x)
/// }
/// })
/// .apply(input)
/// }
///
/// assert_eq!(
/// tag::<Error, _, _>("1")
/// .and(tag("2"))
/// .ok_then(|(r, (first, second))| Ok(("yolo", (12,))))
/// .apply("12"),
/// Ok(("yolo", (12,)))
/// );
///
/// assert_eq!(foobar("truebar"), Ok(("", (FooBar::Bar,))));
/// assert_eq!(foobar("falsefoo"), Ok(("", (FooBar::Foo,))));
/// ```
#[inline]
fn ok_then<O2, R2, P>(self, other: P) -> OkThen<O, R, Self, P>
where
Self: Pipe<I, O, E, R> + Sized,
P: Pipe<(R, O), O2, E, R2> + Sized,
{
OkThen::new(self, other)
}
}
impl<I, O, E, R, P> AndThenExt<I, O, E, R> for P where P: Pipe<I, O, E, R> {}
/// [AndThenExt::and_then] implementation
pub struct AndThen<O, P, F>(P, F, PhantomData<O>);
impl<O, P, F> AndThen<O, P, F> {
fn new(p: P, f: F) -> Self { AndThen(p, f, PhantomData) }
}
impl<I, O, O2, E, R, P, F> Pipe<I, O2, E, R> for AndThen<O, P, F>
where
O: HList,
P: Pipe<I, O, E, R>,
F: FunMut<O, Output = std::result::Result<O2, FatalError<E>>>,
{
fn apply(&mut self, input: I) -> Result<R, O2, E> {
self.0.apply(input).and_then(|(x, y)| Ok((x, self.1.call_fun_mut(y)?)))
}
}
/// [AndThenExt::and_thenf] implementation
pub struct AndThenF<O, P, F>(P, F, PhantomData<O>);
impl<O, P, F> AndThenF<O, P, F> {
fn new(p: P, f: F) -> Self { AndThenF(p, f, PhantomData) }
}
impl<I, O, O2, E, R, P, F> Pipe<I, O2, E, R> for AndThenF<O, P, F>
where
O: HList,
P: Pipe<I, O, E, R>,
F: FnMut(O) -> std::result::Result<O2, FatalError<E>>,
{
fn apply(&mut self, input: I) -> Result<R, O2, E> {
self.0.apply(input).and_then(|(x, y)| Ok((x, self.1(y)?)))
}
}
/// [AndThenExt::ok_and_then] implementation
pub struct OkAndThen<O, R, P, P1>(P, P1, PhantomData<O>, PhantomData<R>);
impl<O, R, P, P1> OkAndThen<O, R, P, P1> {
fn new(p: P, p1: P1) -> Self { Self(p, p1, PhantomData, PhantomData) }
}
impl<I, O, O2, E, R, R2, P, F> Pipe<I, O2, E, R2> for OkAndThen<O, R, P, F>
where
P: Pipe<I, O, E, R>,
F: FunMut<(R, O), Output = std::result::Result<(R2, O2), FatalError<E>>>,
{
fn apply(&mut self, input: I) -> Result<R2, O2, E> {
self.1.call_fun_mut(self.0.apply(input)?)
}
}
/// [AndThenExt::ok_then] implementation
pub struct OkThen<O, R, P, P1>(P, P1, PhantomData<O>, PhantomData<R>);
impl<O, R, P, P1> OkThen<O, R, P, P1> {
fn new(p: P, p1: P1) -> Self { OkThen(p, p1, PhantomData, PhantomData) }
}
impl<I, O, O2, E, R, R2, P, P1> Pipe<I, O2, E, R2> for OkThen<O, R, P, P1>
where
O: HList,
P: Pipe<I, O, E, R>,
P1: Pipe<(R, O), O2, E, R2>,
{
fn apply(&mut self, input: I) -> Result<R2, O2, E> {
self.0.apply(input).and_then(|x| self.1.apply(x))
}
}