| use crate::error::{AddContext, ErrMode, ErrorKind, FromExternalError, ParserError}; |
| use crate::lib::std::borrow::Borrow; |
| use crate::lib::std::ops::Range; |
| use crate::stream::StreamIsPartial; |
| use crate::stream::{Location, Stream}; |
| use crate::trace::trace; |
| use crate::trace::trace_result; |
| use crate::*; |
| |
| /// Implementation of [`Parser::by_ref`][Parser::by_ref] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct ByRef<'p, P> { |
| p: &'p mut P, |
| } |
| |
| impl<'p, P> ByRef<'p, P> { |
| pub(crate) fn new(p: &'p mut P) -> Self { |
| Self { p } |
| } |
| } |
| |
| impl<'p, I, O, E, P: Parser<I, O, E>> Parser<I, O, E> for ByRef<'p, P> { |
| #[inline(always)] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O, E> { |
| self.p.parse_next(i) |
| } |
| } |
| |
| /// Implementation of [`Parser::map`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Map<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Fn(O) -> O2, |
| { |
| parser: F, |
| map: G, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, G, I, O, O2, E> Map<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Fn(O) -> O2, |
| { |
| pub(crate) fn new(parser: F, map: G) -> Self { |
| Self { |
| parser, |
| map, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, G, I, O, O2, E> Parser<I, O2, E> for Map<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Fn(O) -> O2, |
| { |
| #[inline] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O2, E> { |
| match self.parser.parse_next(i) { |
| Err(e) => Err(e), |
| Ok(o) => Ok((self.map)(o)), |
| } |
| } |
| } |
| |
| /// Implementation of [`Parser::try_map`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct TryMap<F, G, I, O, O2, E, E2> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> Result<O2, E2>, |
| I: Stream, |
| E: FromExternalError<I, E2>, |
| { |
| parser: F, |
| map: G, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| e2: core::marker::PhantomData<E2>, |
| } |
| |
| impl<F, G, I, O, O2, E, E2> TryMap<F, G, I, O, O2, E, E2> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> Result<O2, E2>, |
| I: Stream, |
| E: FromExternalError<I, E2>, |
| { |
| pub(crate) fn new(parser: F, map: G) -> Self { |
| Self { |
| parser, |
| map, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| e2: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, G, I, O, O2, E, E2> Parser<I, O2, E> for TryMap<F, G, I, O, O2, E, E2> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> Result<O2, E2>, |
| I: Stream, |
| E: FromExternalError<I, E2>, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<O2, E> { |
| let start = input.checkpoint(); |
| let o = self.parser.parse_next(input)?; |
| let res = (self.map)(o).map_err(|err| { |
| input.reset(start); |
| ErrMode::from_external_error(input, ErrorKind::Verify, err) |
| }); |
| trace_result("verify", &res); |
| res |
| } |
| } |
| |
| /// Implementation of [`Parser::verify_map`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct VerifyMap<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> Option<O2>, |
| I: Stream, |
| E: ParserError<I>, |
| { |
| parser: F, |
| map: G, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, G, I, O, O2, E> VerifyMap<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> Option<O2>, |
| I: Stream, |
| E: ParserError<I>, |
| { |
| pub(crate) fn new(parser: F, map: G) -> Self { |
| Self { |
| parser, |
| map, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, G, I, O, O2, E> Parser<I, O2, E> for VerifyMap<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> Option<O2>, |
| I: Stream, |
| E: ParserError<I>, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<O2, E> { |
| let start = input.checkpoint(); |
| let o = self.parser.parse_next(input)?; |
| let res = (self.map)(o).ok_or_else(|| { |
| input.reset(start); |
| ErrMode::from_error_kind(input, ErrorKind::Verify) |
| }); |
| trace_result("verify", &res); |
| res |
| } |
| } |
| |
| /// Implementation of [`Parser::and_then`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct AndThen<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Parser<O, O2, E>, |
| O: StreamIsPartial, |
| I: Stream, |
| { |
| outer: F, |
| inner: G, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, G, I, O, O2, E> AndThen<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Parser<O, O2, E>, |
| O: StreamIsPartial, |
| I: Stream, |
| { |
| pub(crate) fn new(outer: F, inner: G) -> Self { |
| Self { |
| outer, |
| inner, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, G, I, O, O2, E> Parser<I, O2, E> for AndThen<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Parser<O, O2, E>, |
| O: StreamIsPartial, |
| I: Stream, |
| { |
| #[inline(always)] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O2, E> { |
| let start = i.checkpoint(); |
| let mut o = self.outer.parse_next(i)?; |
| let _ = o.complete(); |
| let o2 = self.inner.parse_next(&mut o).map_err(|err| { |
| i.reset(start); |
| err |
| })?; |
| Ok(o2) |
| } |
| } |
| |
| /// Implementation of [`Parser::parse_to`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct ParseTo<P, I, O, O2, E> |
| where |
| P: Parser<I, O, E>, |
| I: Stream, |
| O: crate::stream::ParseSlice<O2>, |
| E: ParserError<I>, |
| { |
| p: P, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<P, I, O, O2, E> ParseTo<P, I, O, O2, E> |
| where |
| P: Parser<I, O, E>, |
| I: Stream, |
| O: crate::stream::ParseSlice<O2>, |
| E: ParserError<I>, |
| { |
| pub(crate) fn new(p: P) -> Self { |
| Self { |
| p, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<P, I, O, O2, E> Parser<I, O2, E> for ParseTo<P, I, O, O2, E> |
| where |
| P: Parser<I, O, E>, |
| I: Stream, |
| O: crate::stream::ParseSlice<O2>, |
| E: ParserError<I>, |
| { |
| #[inline] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O2, E> { |
| let start = i.checkpoint(); |
| let o = self.p.parse_next(i)?; |
| let res = o.parse_slice().ok_or_else(|| { |
| i.reset(start); |
| ErrMode::from_error_kind(i, ErrorKind::Verify) |
| }); |
| trace_result("verify", &res); |
| res |
| } |
| } |
| |
| /// Implementation of [`Parser::flat_map`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct FlatMap<F, G, H, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> H, |
| H: Parser<I, O2, E>, |
| { |
| f: F, |
| g: G, |
| h: core::marker::PhantomData<H>, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, G, H, I, O, O2, E> FlatMap<F, G, H, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> H, |
| H: Parser<I, O2, E>, |
| { |
| pub(crate) fn new(f: F, g: G) -> Self { |
| Self { |
| f, |
| g, |
| h: Default::default(), |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, G, H, I, O, O2, E> Parser<I, O2, E> for FlatMap<F, G, H, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: FnMut(O) -> H, |
| H: Parser<I, O2, E>, |
| { |
| #[inline(always)] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O2, E> { |
| let o = self.f.parse_next(i)?; |
| (self.g)(o).parse_next(i) |
| } |
| } |
| |
| /// Implementation of [`Parser::complete_err`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct CompleteErr<F> { |
| f: F, |
| } |
| |
| impl<F> CompleteErr<F> { |
| pub(crate) fn new(f: F) -> Self { |
| Self { f } |
| } |
| } |
| |
| impl<F, I, O, E> Parser<I, O, E> for CompleteErr<F> |
| where |
| I: Stream, |
| F: Parser<I, O, E>, |
| E: ParserError<I>, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<O, E> { |
| trace("complete_err", |input: &mut I| { |
| match (self.f).parse_next(input) { |
| Err(ErrMode::Incomplete(_)) => { |
| Err(ErrMode::from_error_kind(input, ErrorKind::Complete)) |
| } |
| rest => rest, |
| } |
| }) |
| .parse_next(input) |
| } |
| } |
| |
| /// Implementation of [`Parser::verify`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Verify<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Fn(&O2) -> bool, |
| I: Stream, |
| O: Borrow<O2>, |
| O2: ?Sized, |
| E: ParserError<I>, |
| { |
| parser: F, |
| filter: G, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, G, I, O, O2, E> Verify<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Fn(&O2) -> bool, |
| I: Stream, |
| O: Borrow<O2>, |
| O2: ?Sized, |
| E: ParserError<I>, |
| { |
| pub(crate) fn new(parser: F, filter: G) -> Self { |
| Self { |
| parser, |
| filter, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, G, I, O, O2, E> Parser<I, O, E> for Verify<F, G, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| G: Fn(&O2) -> bool, |
| I: Stream, |
| O: Borrow<O2>, |
| O2: ?Sized, |
| E: ParserError<I>, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<O, E> { |
| let start = input.checkpoint(); |
| let o = self.parser.parse_next(input)?; |
| let res = (self.filter)(o.borrow()).then_some(o).ok_or_else(|| { |
| input.reset(start); |
| ErrMode::from_error_kind(input, ErrorKind::Verify) |
| }); |
| trace_result("verify", &res); |
| res |
| } |
| } |
| |
| /// Implementation of [`Parser::value`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Value<F, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| O2: Clone, |
| { |
| parser: F, |
| val: O2, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, O2, E> Value<F, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| O2: Clone, |
| { |
| pub(crate) fn new(parser: F, val: O2) -> Self { |
| Self { |
| parser, |
| val, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, O2, E> Parser<I, O2, E> for Value<F, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| O2: Clone, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<O2, E> { |
| (self.parser).parse_next(input).map(|_| self.val.clone()) |
| } |
| } |
| |
| /// Implementation of [`Parser::void`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Void<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, E> Void<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, E> Parser<I, (), E> for Void<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| { |
| #[inline(always)] |
| fn parse_next(&mut self, input: &mut I) -> PResult<(), E> { |
| (self.parser).parse_next(input).map(|_| ()) |
| } |
| } |
| |
| /// Implementation of [`Parser::recognize`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Recognize<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, E> Recognize<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<I, O, E, F> Parser<I, <I as Stream>::Slice, E> for Recognize<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<<I as Stream>::Slice, E> { |
| let checkpoint = input.checkpoint(); |
| match (self.parser).parse_next(input) { |
| Ok(_) => { |
| let offset = input.offset_from(&checkpoint); |
| input.reset(checkpoint); |
| let recognized = input.next_slice(offset); |
| Ok(recognized) |
| } |
| Err(e) => Err(e), |
| } |
| } |
| } |
| |
| /// Implementation of [`Parser::with_recognized`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct WithRecognized<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, E> WithRecognized<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, E> Parser<I, (O, <I as Stream>::Slice), E> for WithRecognized<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<(O, <I as Stream>::Slice), E> { |
| let checkpoint = input.checkpoint(); |
| match (self.parser).parse_next(input) { |
| Ok(result) => { |
| let offset = input.offset_from(&checkpoint); |
| input.reset(checkpoint); |
| let recognized = input.next_slice(offset); |
| Ok((result, recognized)) |
| } |
| Err(e) => Err(e), |
| } |
| } |
| } |
| |
| /// Implementation of [`Parser::span`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Span<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream + Location, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, E> Span<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream + Location, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<I, O, E, F> Parser<I, Range<usize>, E> for Span<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream + Location, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<Range<usize>, E> { |
| let start = input.location(); |
| self.parser.parse_next(input).map(move |_| { |
| let end = input.location(); |
| start..end |
| }) |
| } |
| } |
| |
| /// Implementation of [`Parser::with_span`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct WithSpan<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream + Location, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, E> WithSpan<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream + Location, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, E> Parser<I, (O, Range<usize>), E> for WithSpan<F, I, O, E> |
| where |
| F: Parser<I, O, E>, |
| I: Stream + Location, |
| { |
| #[inline] |
| fn parse_next(&mut self, input: &mut I) -> PResult<(O, Range<usize>), E> { |
| let start = input.location(); |
| self.parser.parse_next(input).map(move |output| { |
| let end = input.location(); |
| (output, (start..end)) |
| }) |
| } |
| } |
| |
| /// Implementation of [`Parser::output_into`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct OutputInto<F, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| O: Into<O2>, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| o2: core::marker::PhantomData<O2>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, O2, E> OutputInto<F, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| O: Into<O2>, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| o2: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, O2, E> Parser<I, O2, E> for OutputInto<F, I, O, O2, E> |
| where |
| F: Parser<I, O, E>, |
| O: Into<O2>, |
| { |
| #[inline] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O2, E> { |
| self.parser.parse_next(i).map(|o| o.into()) |
| } |
| } |
| |
| /// Implementation of [`Parser::err_into`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct ErrInto<F, I, O, E, E2> |
| where |
| F: Parser<I, O, E>, |
| E: Into<E2>, |
| { |
| parser: F, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| e2: core::marker::PhantomData<E2>, |
| } |
| |
| impl<F, I, O, E, E2> ErrInto<F, I, O, E, E2> |
| where |
| F: Parser<I, O, E>, |
| E: Into<E2>, |
| { |
| pub(crate) fn new(parser: F) -> Self { |
| Self { |
| parser, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| e2: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, E, E2> Parser<I, O, E2> for ErrInto<F, I, O, E, E2> |
| where |
| F: Parser<I, O, E>, |
| E: Into<E2>, |
| { |
| #[inline] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O, E2> { |
| match self.parser.parse_next(i) { |
| Ok(ok) => Ok(ok), |
| Err(ErrMode::Backtrack(e)) => Err(ErrMode::Backtrack(e.into())), |
| Err(ErrMode::Cut(e)) => Err(ErrMode::Cut(e.into())), |
| Err(ErrMode::Incomplete(e)) => Err(ErrMode::Incomplete(e)), |
| } |
| } |
| } |
| |
| /// Implementation of [`Parser::context`] |
| #[cfg_attr(nightly, warn(rustdoc::missing_doc_code_examples))] |
| pub struct Context<F, I, O, E, C> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| E: AddContext<I, C>, |
| C: Clone + crate::lib::std::fmt::Debug, |
| { |
| parser: F, |
| context: C, |
| i: core::marker::PhantomData<I>, |
| o: core::marker::PhantomData<O>, |
| e: core::marker::PhantomData<E>, |
| } |
| |
| impl<F, I, O, E, C> Context<F, I, O, E, C> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| E: AddContext<I, C>, |
| C: Clone + crate::lib::std::fmt::Debug, |
| { |
| pub(crate) fn new(parser: F, context: C) -> Self { |
| Self { |
| parser, |
| context, |
| i: Default::default(), |
| o: Default::default(), |
| e: Default::default(), |
| } |
| } |
| } |
| |
| impl<F, I, O, E, C> Parser<I, O, E> for Context<F, I, O, E, C> |
| where |
| F: Parser<I, O, E>, |
| I: Stream, |
| E: AddContext<I, C>, |
| C: Clone + crate::lib::std::fmt::Debug, |
| { |
| #[inline] |
| fn parse_next(&mut self, i: &mut I) -> PResult<O, E> { |
| #[cfg(feature = "debug")] |
| let name = format!("context={:?}", self.context); |
| #[cfg(not(feature = "debug"))] |
| let name = "context"; |
| trace(name, move |i: &mut I| { |
| (self.parser) |
| .parse_next(i) |
| .map_err(|err| err.map(|err| err.add_context(i, self.context.clone()))) |
| }) |
| .parse_next(i) |
| } |
| } |