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use serde; use std::borrow; use std::cmp; use std::hash; use std::result; use {Span, WithSpan}; #[derive(Clone)] pub struct Loc<T> { inner: T, span: Span, } impl<T: serde::Serialize> serde::Serialize for Loc<T> { fn serialize<S>(&self, serializer: S) -> result::Result<S::Ok, S::Error> where S: serde::Serializer, { self.inner.serialize(serializer) } } impl<T> Loc<T> { pub fn new<P: Into<Span>>(inner: T, span: P) -> Loc<T> { Loc { inner: inner, span: span.into(), } } pub fn value(loc: &Loc<T>) -> &T { &loc.inner } pub fn span(loc: &Loc<T>) -> &Span { &loc.span } pub fn take(loc: Loc<T>) -> T { loc.inner } pub fn take_pair(loc: Loc<T>) -> (T, Span) { (loc.inner, loc.span) } pub fn borrow_pair(loc: &Loc<T>) -> (&T, &Span) { (&loc.inner, &loc.span) } pub fn map<U, O>(loc: Loc<T>, op: O) -> Loc<U> where O: FnOnce(T) -> U, { Loc::new(op(loc.inner), loc.span.clone()) } pub fn and_then<U, O, E: WithSpan>( Loc { inner, span }: Loc<T>, op: O, ) -> result::Result<Loc<U>, E> where O: FnOnce(T) -> result::Result<U, E>, { op(inner) .map(|value| Loc::new(value, span.clone())) .with_span(&span) } pub fn as_ref(loc: &Loc<T>) -> Loc<&T> { Loc::new(&loc.inner, loc.span.clone()) } } impl<T> cmp::PartialEq for Loc<T> where T: cmp::PartialEq, { fn eq(&self, other: &Self) -> bool { self.inner.eq(other) } } impl<T> cmp::Eq for Loc<T> where T: cmp::Eq, { } impl<T> cmp::PartialOrd for Loc<T> where T: cmp::PartialOrd, { fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> { self.inner.partial_cmp(other) } } impl<T> cmp::Ord for Loc<T> where T: cmp::Ord, Self: cmp::PartialOrd + cmp::Eq, { fn cmp(&self, other: &Self) -> cmp::Ordering { self.inner.cmp(other) } } impl<T> hash::Hash for Loc<T> where T: hash::Hash, { fn hash<H>(&self, state: &mut H) where H: hash::Hasher, { self.inner.hash(state) } } impl<T> ::std::ops::Deref for Loc<T> { type Target = T; fn deref(&self) -> &T { &self.inner } } impl<T> ::std::ops::DerefMut for Loc<T> { fn deref_mut(&mut self) -> &mut T { &mut self.inner } } impl<T> ::std::convert::AsMut<T> for Loc<T> { fn as_mut(&mut self) -> &mut T { &mut self.inner } } impl<T> borrow::Borrow<T> for Loc<T> { fn borrow(&self) -> &T { &**self } } impl<T> ::std::fmt::Display for Loc<T> where T: ::std::fmt::Display, { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, "{}", self.inner) } } impl<T> ::std::fmt::Debug for Loc<T> where T: ::std::fmt::Debug, { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, "<{:?}@{:?}>", self.inner, self.span) } } impl<'a, T> From<&'a Loc<T>> for Span { fn from(value: &'a Loc<T>) -> Self { Loc::span(value).clone() } }