Struct syntax::ext::quote::rt::Span
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#[repr(packed)]pub struct Span(_);
A compressed span.
Contains either fields of SpanData
inline if they are small, or index into span interner.
The primary goal of Span
is to be as small as possible and fit into other structures
(that's why it uses packed
as well). Decoding speed is the second priority.
See SpanData
for the info on span fields in decoded representation.
Methods
impl Span
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pub fn new(lo: BytePos, hi: BytePos, ctxt: SyntaxContext) -> Span
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pub fn data(self) -> SpanData
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impl Span
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pub fn lo(self) -> BytePos
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pub fn with_lo(self, lo: BytePos) -> Span
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pub fn hi(self) -> BytePos
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pub fn with_hi(self, hi: BytePos) -> Span
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pub fn ctxt(self) -> SyntaxContext
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pub fn with_ctxt(self, ctxt: SyntaxContext) -> Span
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pub fn empty(self) -> Span
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Returns a new span representing an empty span at the beginning of this span
pub fn substitute_dummy(self, other: Span) -> Span
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Returns self
if self
is not the dummy span, and other
otherwise.
pub fn contains(self, other: Span) -> bool
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Return true if self
fully encloses other
.
pub fn source_equal(&self, other: &Span) -> bool
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Return true if the spans are equal with regards to the source text.
Use this instead of ==
when either span could be generated code,
and you only care that they point to the same bytes of source text.
pub fn trim_start(self, other: Span) -> Option<Span>
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Returns Some(span)
, where the start is trimmed by the end of other
pub fn source_callsite(self) -> Span
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Return the source span - this is either the supplied span, or the span for the macro callsite that expanded to it.
pub fn source_callee(self) -> Option<NameAndSpan>
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Return the source callee.
Returns None if the supplied span has no expansion trace, else returns the NameAndSpan for the macro definition corresponding to the source callsite.
pub fn allows_unstable(&self) -> bool
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Check if a span is "internal" to a macro in which #[unstable]
items can be used (that is, a macro marked with
#[allow_internal_unstable]
).
pub fn is_compiler_desugaring(&self, kind: CompilerDesugaringKind) -> bool
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Check if this span arises from a compiler desugaring of kind kind
.
pub fn compiler_desugaring_kind(&self) -> Option<CompilerDesugaringKind>
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Return the compiler desugaring that created this span, or None if this span is not from a desugaring.
pub fn allows_unsafe(&self) -> bool
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Check if a span is "internal" to a macro in which unsafe
can be used without triggering the unsafe_code
lint
pub fn macro_backtrace(self) -> Vec<MacroBacktrace>
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pub fn to(self, end: Span) -> Span
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Return a Span
that would enclose both self
and end
.
pub fn between(self, end: Span) -> Span
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Return a Span
between the end of self
to the beginning of end
.
pub fn until(self, end: Span) -> Span
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Return a Span
between the beginning of self
to the beginning of end
.
Trait Implementations
impl Default for Span
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impl From<Span> for MultiSpan
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impl !Send for Span
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impl Clone for Span
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fn clone(&self) -> Span
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl PartialOrd<Span> for Span
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fn partial_cmp(&self, rhs: &Span) -> Option<Ordering>
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This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, other: &Rhs) -> bool
1.0.0[src]
This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, other: &Rhs) -> bool
1.0.0[src]
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, other: &Rhs) -> bool
1.0.0[src]
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, other: &Rhs) -> bool
1.0.0[src]
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl UseSpecializedDecodable for Span
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fn default_decode<D>(d: &mut D) -> Result<Span, <D as Decoder>::Error> where
D: Decoder,
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D: Decoder,
Defaults to returning an error (see SpecializationError
).
impl Copy for Span
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impl Hash for Span
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fn hash<__H>(&self, __arg_0: &mut __H) where
__H: Hasher,
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__H: Hasher,
Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl Ord for Span
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fn cmp(&self, rhs: &Span) -> Ordering
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This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self
1.21.0[src]
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
1.21.0[src]
Compares and returns the minimum of two values. Read more
impl UseSpecializedEncodable for Span
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fn default_encode<S>(&self, s: &mut S) -> Result<(), <S as Encoder>::Error> where
S: Encoder,
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S: Encoder,
Defaults to returning an error (see SpecializationError
).
impl PartialEq<Span> for Span
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fn eq(&self, __arg_0: &Span) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Span) -> bool
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This method tests for !=
.
impl !Sync for Span
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impl Debug for Span
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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more