Struct DoubleSpan 

pub struct DoubleSpan(pub Span, pub Bound<Span>);

The source boundaries of a complete or incomplete delimiter pair.

A delimiter is two spelled tokens, not one span with an inferred width: storing both is what makes Delimiter::opening_span and Delimiter::closing_span plain field reads instead of arithmetic that assumes the source layout. The closing boundary is Bound::Unbounded while the group is incomplete, so a missing token is never confused with a zero-width token at the current end of input.

Tuple Fields

0: Span

1: Bound<Span>

Implementations

impl DoubleSpan

pub fn new(open: Span, close: Span) -> Self

Creates an opening and closing span pair.

pub fn synthetic(kind: DelimiterKind) -> Self

Creates a pair backed by the delimiter’s synthetic source spelling.

pub fn unclosed(open: Span) -> Self

Creates a delimiter whose closing token is not present yet.

pub fn open(&self) -> Span

Returns the opening delimiter span.

pub fn close(&self) -> Option<Span>

Returns the closing delimiter span when it is present.

pub fn close_bound(&self) -> Bound<Span>

Returns the closing boundary, preserving an incomplete delimiter as Bound::Unbounded.

pub fn is_closed(&self) -> bool

Reports whether a closing delimiter was present or synthetically quoted.

Trait Implementations

impl Clone for DoubleSpan

fn clone(&self) -> DoubleSpan

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DoubleSpan

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for DoubleSpan

impl PartialEq for DoubleSpan

fn eq(&self, other: &DoubleSpan) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Spanned for DoubleSpan

fn try_span(&self) -> Option<Span>

Returns the smallest span covering this value, when its constituents share one source snapshot.

fn span(&self) -> Span

Returns the smallest span covering this value.

fn expect_span(&self) -> Span

Returns this value’s span when one source snapshot covers it.

impl StructuralPartialEq for DoubleSpan