[−][src]Struct syntax::source_map::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 is_dummy(self) -> bool
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Returns true
if this is a dummy span with any hygienic context.
pub fn shrink_to_lo(self) -> Span
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Returns a new span representing an empty span at the beginning of this span
pub fn shrink_to_hi(self) -> Span
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Returns a new span representing an empty span at the end 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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Returns true
if self
fully encloses other
.
pub fn overlaps(self, other: Span) -> bool
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Returns true
if self
touches other
.
pub fn source_equal(&self, other: &Span) -> bool
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Returns 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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Returns the source span -- this is either the supplied span, or the span for the macro callsite that expanded to it.
pub fn parent(self) -> Option<Span>
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The Span
for the tokens in the previous macro expansion from which self
was generated,
if any.
pub fn edition(self) -> Edition
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Edition of the crate from which this span came.
pub fn rust_2015(&self) -> bool
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pub fn rust_2018(&self) -> bool
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pub fn source_callee(self) -> Option<ExpnInfo>
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Returns the source callee.
Returns None
if the supplied span has no expansion trace,
else returns the ExpnInfo
for the macro definition
corresponding to the source callsite.
pub fn allows_unstable(&self, feature: &str) -> bool
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Checks 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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Checks if this span arises from a compiler desugaring of kind kind
.
pub fn compiler_desugaring_kind(&self) -> Option<CompilerDesugaringKind>
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Returns 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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Checks 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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Returns a Span
that would enclose both self
and end
.
pub fn between(self, end: Span) -> Span
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Returns a Span
between the end of self
to the beginning of end
.
pub fn until(self, end: Span) -> Span
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Returns a Span
between the beginning of self
to the beginning of end
.
pub fn from_inner_byte_pos(self, start: usize, end: usize) -> Span
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pub fn apply_mark(self, mark: Mark) -> Span
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pub fn remove_mark(&mut self) -> Mark
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pub fn adjust(&mut self, expansion: Mark) -> Option<Mark>
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pub fn glob_adjust(
&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
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&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
pub fn reverse_glob_adjust(
&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
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&mut self,
expansion: Mark,
glob_ctxt: SyntaxContext
) -> Option<Option<Mark>>
pub fn modern(self) -> Span
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pub fn modern_and_legacy(self) -> Span
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Trait Implementations
impl Hash for Span
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fn hash<H>(&self, state: &mut H) where
H: Hasher,
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H: Hasher,
default fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more
impl UseSpecializedEncodable for Span
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impl Debug for Span
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impl Copy for Span
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impl Ord for Span
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fn cmp(&self, rhs: &Span) -> Ordering
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default fn max(self, other: Self) -> Self
1.21.0[src]
Compares and returns the maximum of two values. Read more
default fn min(self, other: Self) -> Self
1.21.0[src]
Compares and returns the minimum of two values. Read more
default fn clamp(self, min: Self, max: Self) -> Self
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clamp
)Restrict a value to a certain interval. Read more
impl Clone for Span
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fn clone(&self) -> Span
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default fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl UseSpecializedDecodable for Span
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impl Eq for Span
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impl !Sync for Span
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impl PartialOrd<Span> for Span
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fn partial_cmp(&self, rhs: &Span) -> Option<Ordering>
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#[must_use]
default 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
#[must_use]
default 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
#[must_use]
default 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
#[must_use]
default 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 From<Span> for MultiSpan
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impl Default for Span
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impl PartialEq<Span> for Span
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fn eq(&self, other: &Span) -> bool
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#[must_use]
default fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
This method tests for !=
.
impl !Send for Span
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Blanket Implementations
impl<T> From for T
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impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Encodable for T where
T: UseSpecializedEncodable + ?Sized,
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T: UseSpecializedEncodable + ?Sized,
impl<T> Decodable for T where
T: UseSpecializedDecodable,
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T: UseSpecializedDecodable,
impl<E> SpecializationError for E
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default fn not_found<S, T>(
trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
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trait_name: &'static str,
method_name: &'static str
) -> E where
T: ?Sized,
impl<T> Send for T where
T: ?Sized,
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T: ?Sized,
impl<T> Sync for T where
T: ?Sized,
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T: ?Sized,