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private.rs
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private.rs
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use super::*;
#[derive(Clone)]
pub(crate) struct Located<T, E> {
pub(crate) pos: T,
pub(crate) err: E,
}
impl<T, E> Located<T, E> {
#[inline]
pub fn at(pos: T, err: E) -> Self {
Self { pos, err }
}
}
/// The result of calling [`Parser::go`]
pub(crate) type PResult<M, O> = Result<<M as Mode>::Output<O>, ()>;
/// The result of calling [`IterParser::next`]
pub(crate) type IPResult<M, O> = Result<Option<<M as Mode>::Output<O>>, ()>;
/// An abstract parse mode - can be [`Emit`] or [`Check`] in practice, and represents the
/// common interface for handling both in the same method.
pub trait Mode {
/// The output of this mode for a given type
type Output<T>;
/// Bind the result of a closure into an output
fn bind<T, F: FnOnce() -> T>(f: F) -> Self::Output<T>;
/// Given an [`Output`](Self::Output), takes its value and return a newly generated output
fn map<T, U, F: FnOnce(T) -> U>(x: Self::Output<T>, f: F) -> Self::Output<U>;
/// Choose between two fallible functions to execute depending on the mode.
fn choose<A, T, E, F: FnOnce(A) -> Result<T, E>, G: FnOnce(A) -> Result<(), E>>(
arg: A,
f: F,
g: G,
) -> Result<Self::Output<T>, E>;
/// Given two [`Output`](Self::Output)s, take their values and combine them into a new
/// output value
fn combine<T, U, V, F: FnOnce(T, U) -> V>(
x: Self::Output<T>,
y: Self::Output<U>,
f: F,
) -> Self::Output<V>;
/// By-reference version of [`Mode::combine`].
fn combine_mut<T, U, F: FnOnce(&mut T, U)>(x: &mut Self::Output<T>, y: Self::Output<U>, f: F);
/// Given an array of outputs, bind them into an output of arrays
fn array<T, const N: usize>(x: [Self::Output<T>; N]) -> Self::Output<[T; N]>;
fn from_mut<T>(r: &mut Self::Output<T>) -> Self::Output<&mut T>;
fn get_or<T, F: FnOnce() -> T>(r: Self::Output<T>, f: F) -> T;
/// Invoke a parser user the current mode. This is normally equivalent to
/// [`parser.go::<M>(inp)`](Parser::go), but it can be called on unsized values such as
/// `dyn Parser`.
fn invoke<'a, I, O, E, P>(parser: &P, inp: &mut InputRef<'a, '_, I, E>) -> PResult<Self, O>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
P: Parser<'a, I, O, E> + ?Sized;
/// Invoke a parser with configuration using the current mode. This is normally equivalent
/// to [`parser.go::<M>(inp)`](ConfigParser::go_cfg), but it can be called on unsized values
/// such as `dyn Parser`.
fn invoke_cfg<'a, I, O, E, P>(
parser: &P,
inp: &mut InputRef<'a, '_, I, E>,
cfg: P::Config,
) -> PResult<Self, O>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
P: ConfigParser<'a, I, O, E> + ?Sized;
}
/// Emit mode - generates parser output
pub struct Emit;
impl Mode for Emit {
type Output<T> = T;
#[inline(always)]
fn bind<T, F: FnOnce() -> T>(f: F) -> Self::Output<T> {
f()
}
#[inline(always)]
fn map<T, U, F: FnOnce(T) -> U>(x: Self::Output<T>, f: F) -> Self::Output<U> {
f(x)
}
#[inline(always)]
fn choose<A, T, E, F: FnOnce(A) -> Result<T, E>, G: FnOnce(A) -> Result<(), E>>(
arg: A,
f: F,
_: G,
) -> Result<Self::Output<T>, E> {
f(arg)
}
#[inline(always)]
fn combine<T, U, V, F: FnOnce(T, U) -> V>(
x: Self::Output<T>,
y: Self::Output<U>,
f: F,
) -> Self::Output<V> {
f(x, y)
}
#[inline(always)]
fn combine_mut<T, U, F: FnOnce(&mut T, U)>(x: &mut Self::Output<T>, y: Self::Output<U>, f: F) {
f(x, y)
}
#[inline(always)]
fn array<T, const N: usize>(x: [Self::Output<T>; N]) -> Self::Output<[T; N]> {
x
}
#[inline(always)]
fn from_mut<T>(r: &mut Self::Output<T>) -> Self::Output<&mut T> {
r
}
#[inline(always)]
fn get_or<T, F: FnOnce() -> T>(r: Self::Output<T>, _f: F) -> T {
r
}
#[inline(always)]
fn invoke<'a, I, O, E, P>(parser: &P, inp: &mut InputRef<'a, '_, I, E>) -> PResult<Self, O>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
P: Parser<'a, I, O, E> + ?Sized,
{
parser.go_emit(inp)
}
#[inline(always)]
fn invoke_cfg<'a, I, O, E, P>(
parser: &P,
inp: &mut InputRef<'a, '_, I, E>,
cfg: P::Config,
) -> PResult<Self, O>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
P: ConfigParser<'a, I, O, E> + ?Sized,
{
parser.go_emit_cfg(inp, cfg)
}
}
/// Check mode - all output is discarded, and only uses parsers to check validity
pub struct Check;
impl Mode for Check {
type Output<T> = ();
#[inline(always)]
fn bind<T, F: FnOnce() -> T>(_: F) -> Self::Output<T> {}
#[inline(always)]
fn map<T, U, F: FnOnce(T) -> U>(_: Self::Output<T>, _: F) -> Self::Output<U> {}
#[inline(always)]
fn choose<A, T, E, F: FnOnce(A) -> Result<T, E>, G: FnOnce(A) -> Result<(), E>>(
arg: A,
_: F,
g: G,
) -> Result<Self::Output<T>, E> {
g(arg)
}
#[inline(always)]
fn combine<T, U, V, F: FnOnce(T, U) -> V>(
_: Self::Output<T>,
_: Self::Output<U>,
_: F,
) -> Self::Output<V> {
}
#[inline(always)]
fn combine_mut<T, U, F: FnOnce(&mut T, U)>(_: &mut Self::Output<T>, _: Self::Output<U>, _: F) {}
#[inline(always)]
fn array<T, const N: usize>(_: [Self::Output<T>; N]) -> Self::Output<[T; N]> {}
#[inline(always)]
fn from_mut<T>(_r: &mut Self::Output<T>) -> Self::Output<&mut T> {}
#[inline(always)]
fn get_or<T, F: FnOnce() -> T>(_r: Self::Output<T>, f: F) -> T {
f()
}
#[inline(always)]
fn invoke<'a, I, O, E, P>(parser: &P, inp: &mut InputRef<'a, '_, I, E>) -> PResult<Self, O>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
P: Parser<'a, I, O, E> + ?Sized,
{
parser.go_check(inp)
}
#[inline(always)]
fn invoke_cfg<'a, I, O, E, P>(
parser: &P,
inp: &mut InputRef<'a, '_, I, E>,
cfg: P::Config,
) -> PResult<Self, O>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
P: ConfigParser<'a, I, O, E> + ?Sized,
{
parser.go_check_cfg(inp, cfg)
}
}
// TODO: Consider removing these sealed traits in favour of `Sealed`, with the given methods just being on `Parser`
// with doc(hidden)
#[cfg_attr(
feature = "nightly",
diagnostic::on_unimplemented(
message = "The following is not a parser from `{I}` to `{O}`: `{Self}`",
label = "This parser is not compatible because it does not implement `Parser<{I}, {O}, E>`",
note = "You should check that the output types of your parsers are consistent with the combinators you're using",
)
)]
pub trait ParserSealed<'a, I: Input<'a>, O, E: ParserExtra<'a, I>> {
fn go<M: Mode>(&self, inp: &mut InputRef<'a, '_, I, E>) -> PResult<M, O>
where
Self: Sized;
fn go_emit(&self, inp: &mut InputRef<'a, '_, I, E>) -> PResult<Emit, O>;
fn go_check(&self, inp: &mut InputRef<'a, '_, I, E>) -> PResult<Check, O>;
fn boxed<'b>(self) -> Boxed<'a, 'b, I, O, E>
where
Self: MaybeSync + Sized + 'a + 'b,
{
Boxed {
inner: RefC::new(self),
}
}
}
pub trait ConfigParserSealed<'a, I, O, E>: ParserSealed<'a, I, O, E>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
{
type Config: Default;
fn go_cfg<M: Mode>(&self, inp: &mut InputRef<'a, '_, I, E>, cfg: Self::Config) -> PResult<M, O>
where
Self: Sized;
fn go_emit_cfg(&self, inp: &mut InputRef<'a, '_, I, E>, cfg: Self::Config) -> PResult<Emit, O>;
fn go_check_cfg(
&self,
inp: &mut InputRef<'a, '_, I, E>,
cfg: Self::Config,
) -> PResult<Check, O>;
}
pub trait IterParserSealed<'a, I, O, E>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
{
type IterState<M: Mode>
where
I: 'a;
// Determines whether this iter parser is expected to not consume input on each iteration
const NONCONSUMPTION_IS_OK: bool = false;
#[doc(hidden)]
fn make_iter<M: Mode>(
&self,
inp: &mut InputRef<'a, '_, I, E>,
) -> PResult<Emit, Self::IterState<M>>;
#[doc(hidden)]
fn next<M: Mode>(
&self,
inp: &mut InputRef<'a, '_, I, E>,
state: &mut Self::IterState<M>,
) -> IPResult<M, O>;
}
pub trait ConfigIterParserSealed<'a, I, O, E>: IterParserSealed<'a, I, O, E>
where
I: Input<'a>,
E: ParserExtra<'a, I>,
{
type Config: Default;
#[doc(hidden)]
fn next_cfg<M: Mode>(
&self,
inp: &mut InputRef<'a, '_, I, E>,
state: &mut Self::IterState<M>,
cfg: &Self::Config,
) -> IPResult<M, O>;
}
// TODO: Remove this when MaybeUninit transforms to/from arrays stabilize in any form
pub(crate) trait MaybeUninitExt<T>: Sized {
/// Identical to the unstable [`MaybeUninit::uninit_array`]
fn uninit_array<const N: usize>() -> [Self; N];
/// Identical to the unstable [`MaybeUninit::array_assume_init`]
unsafe fn array_assume_init<const N: usize>(uninit: [Self; N]) -> [T; N];
}
impl<T> MaybeUninitExt<T> for MaybeUninit<T> {
#[allow(clippy::uninit_assumed_init)]
fn uninit_array<const N: usize>() -> [Self; N] {
// SAFETY: Output type is entirely uninhabited - IE, it's made up entirely of `MaybeUninit`
unsafe { MaybeUninit::uninit().assume_init() }
}
unsafe fn array_assume_init<const N: usize>(uninit: [Self; N]) -> [T; N] {
(&uninit as *const [Self; N] as *const [T; N]).read()
}
}
pub trait Sealed {}