Struct SyntaxContext 

pub struct SyntaxContext(/* private fields */);

Available on crate feature __common only.

A SyntaxContext represents a chain of macro expansions (represented by marks).

Implementations

impl SyntaxContext

pub fn within_ignored_ctxt<F, Ret>(op: F) -> Ret

where F: FnOnce() -> Ret,

In op, EqIgnoreSpan of [Ident] will ignore the syntax context.

impl SyntaxContext

pub const fn empty() -> SyntaxContext

pub fn has_mark(self, mark: Mark) -> bool

Returns true if self is marked with mark.

Panics if mark is not a valid mark.

pub fn as_u32(self) -> u32

pub fn from_u32(raw: u32) -> SyntaxContext

pub fn apply_mark(self, mark: Mark) -> SyntaxContext

Extend a syntax context with a given mark and default transparency for that mark.

pub fn remove_mark(&mut self) -> Mark

Pulls a single mark off of the syntax context. This effectively moves the context up one macro definition level. That is, if we have a nested macro definition as follows:

macro_rules! f {
   macro_rules! g {
       ...
   }
}

and we have a SyntaxContext that is referring to something declared by an invocation of g (call it g1), calling remove_mark will result in the SyntaxContext for the invocation of f that created g1. Returns the mark that was removed.

pub fn outer(self) -> Mark

Trait Implementations

impl Clone for SyntaxContext

fn clone(&self) -> SyntaxContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SyntaxContext

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

Formats the value using the given formatter.

impl Default for SyntaxContext

fn default() -> SyntaxContext

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SyntaxContext

fn deserialize<__D>( __deserializer: __D, ) -> Result<SyntaxContext, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl EqIgnoreSpan for SyntaxContext

fn eq_ignore_span(&self, other: &SyntaxContext) -> bool

impl<V> FoldWith<V> for SyntaxContext

where V: Fold + ?Sized,

fn fold_with(self, visitor: &mut V) -> SyntaxContext

Calls Fold::fold_syntax_context with self. (Extra impl)

fn fold_children_with(self, visitor: &mut V) -> SyntaxContext

Visit children nodes of self`` with visitor`.

impl Hash for SyntaxContext

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for SyntaxContext

fn cmp(&self, other: &SyntaxContext) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for SyntaxContext

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for SyntaxContext

fn partial_cmp(&self, other: &SyntaxContext) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for SyntaxContext

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<V> VisitMutWith<V> for SyntaxContext

where V: VisitMut + ?Sized,

fn visit_mut_with(&mut self, visitor: &mut V)

Calls VisitMut::visit_mut_syntax_context with self. (Extra impl)

fn visit_mut_children_with(&mut self, visitor: &mut V)

Visit children nodes of self`` with visitor`.

impl<V> VisitWith<V> for SyntaxContext

where V: Visit + ?Sized,

fn visit_with(&self, visitor: &mut V)

Calls Visit::visit_syntax_context with self. (Extra impl)

fn visit_children_with(&self, visitor: &mut V)

Visit children nodes of self`` with visitor`.

impl Copy for SyntaxContext

impl Eq for SyntaxContext

impl StructuralPartialEq for SyntaxContext

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 4 bytes