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use std::{borrow::Cow, rc::Rc, sync::Arc};
pub use crate::syntax_pos::{
hygiene, BytePos, CharPos, FileName, Globals, Loc, LocWithOpt, Mark, MultiSpan, SourceFile,
SourceFileAndBytePos, SourceFileAndLine, Span, SpanLinesError, SyntaxContext, DUMMY_SP,
GLOBALS, NO_EXPANSION,
};
pub trait Spanned {
fn span(&self) -> Span;
}
impl<'a, T> Spanned for Cow<'a, T>
where
T: Spanned + Clone,
{
#[inline(always)]
fn span(&self) -> Span {
(**self).span()
}
}
impl Spanned for Span {
#[inline(always)]
fn span(&self) -> Span {
*self
}
}
impl Spanned for BytePos {
#[inline(always)]
fn span(&self) -> Span {
Span::new(*self, *self, Default::default())
}
}
impl<S> Spanned for Option<S>
where
S: Spanned,
{
fn span(&self) -> Span {
match *self {
Some(ref s) => s.span(),
None => DUMMY_SP,
}
}
}
impl<S> Spanned for Rc<S>
where
S: ?Sized + Spanned,
{
fn span(&self) -> Span {
<S as Spanned>::span(&*self)
}
}
impl<S> Spanned for Arc<S>
where
S: ?Sized + Spanned,
{
fn span(&self) -> Span {
<S as Spanned>::span(&*self)
}
}
impl<S> Spanned for Box<S>
where
S: ?Sized + Spanned,
{
fn span(&self) -> Span {
<S as Spanned>::span(&*self)
}
}
impl<'a, S> Spanned for &'a S
where
S: ?Sized + Spanned,
{
fn span(&self) -> Span {
<S as Spanned>::span(*self)
}
}
impl<A, B> Spanned for ::either::Either<A, B>
where
A: Spanned,
B: Spanned,
{
fn span(&self) -> Span {
match *self {
::either::Either::Left(ref n) => n.span(),
::either::Either::Right(ref n) => n.span(),
}
}
}