swc_common::hygiene

Struct SyntaxContext

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#[repr(C)]
pub struct SyntaxContext(/* private fields */);
Expand description

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

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impl SyntaxContext

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

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

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impl SyntaxContext

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pub const fn empty() -> Self

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

Returns true if self is marked with mark.

Panics if mark is not a valid mark.

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pub fn as_u32(self) -> u32

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pub fn from_u32(raw: u32) -> SyntaxContext

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

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

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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.

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pub fn adjust(&mut self, expansion: Mark) -> Option<Mark>

Adjust this context for resolution in a scope created by the given expansion. For example, consider the following three resolutions of f:

mod foo {
    pub fn f() {}
} // `f`'s `SyntaxContext` is empty.
m!(f);
macro m($f:ident) {
    mod bar {
        pub fn f() {} // `f`'s `SyntaxContext` has a single `Mark` from `m`.
        pub fn $f() {} // `$f`'s `SyntaxContext` is empty.
    }
    foo::f(); // `f`'s `SyntaxContext` has a single `Mark` from `m`
              //^ Since `mod foo` is outside this expansion, `adjust` removes the mark from `f`,
              //| and it resolves to `::foo::f`.
    bar::f(); // `f`'s `SyntaxContext` has a single `Mark` from `m`
              //^ Since `mod bar` not outside this expansion, `adjust` does not change `f`,
              //| and it resolves to `::bar::f`.
    bar::$f(); // `f`'s `SyntaxContext` is empty.
               //^ Since `mod bar` is not outside this expansion, `adjust` does not change `$f`,
               //| and it resolves to `::bar::$f`.
}

This returns the expansion whose definition scope we use to privacy check the resolution, or None if we privacy check as usual (i.e. not w.r.t. a macro definition scope).

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pub fn glob_adjust( &mut self, expansion: Mark, glob_ctxt: SyntaxContext, ) -> Option<Option<Mark>>

Adjust this context for resolution in a scope created by the given expansion via a glob import with the given SyntaxContext. For example:

m!(f);
macro m($i:ident) {
    mod foo {
        pub fn f() {} // `f`'s `SyntaxContext` has a single `Mark` from `m`.
        pub fn $i() {} // `$i`'s `SyntaxContext` is empty.
    }
    n(f);
    macro n($j:ident) {
        use foo::*;
        f(); // `f`'s `SyntaxContext` has a mark from `m` and a mark from `n`
             //^ `glob_adjust` removes the mark from `n`, so this resolves to `foo::f`.
        $i(); // `$i`'s `SyntaxContext` has a mark from `n`
              //^ `glob_adjust` removes the mark from `n`, so this resolves to `foo::$i`.
        $j(); // `$j`'s `SyntaxContext` has a mark from `m`
              //^ This cannot be glob-adjusted, so this is a resolution error.
    }
}

This returns None if the context cannot be glob-adjusted. Otherwise, it returns the scope to use when privacy checking (see adjust for details).

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pub fn reverse_glob_adjust( &mut self, expansion: Mark, glob_ctxt: SyntaxContext, ) -> Option<Option<Mark>>

Undo glob_adjust if possible:

if let Some(privacy_checking_scope) = self.reverse_glob_adjust(expansion, glob_ctxt) {
    assert!(self.glob_adjust(expansion, glob_ctxt) == Some(privacy_checking_scope));
}
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pub fn outer(self) -> Mark

Trait Implementations§

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impl Archive for SyntaxContext

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const COPY_OPTIMIZATION: CopyOptimization<Self> = _

An optimization flag that allows the bytes of this type to be copied directly to a writer instead of calling serialize. Read more
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type Archived = ArchivedSyntaxContext

The archived representation of this type. Read more
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type Resolver = SyntaxContextResolver

The resolver for this type. It must contain all the additional information from serializing needed to make the archived type from the normal type.
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fn resolve(&self, resolver: Self::Resolver, out: Place<Self::Archived>)

Creates the archived version of this value at the given position and writes it to the given output. Read more
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impl<__C: Fallible + ?Sized> CheckBytes<__C> for SyntaxContext
where <__C as Fallible>::Error: Trace, u32: CheckBytes<__C>,

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unsafe fn check_bytes( value: *const Self, context: &mut __C, ) -> Result<(), <__C as Fallible>::Error>

Checks whether the given pointer points to a valid value within the given context. Read more
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impl Clone for SyntaxContext

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fn clone(&self) -> SyntaxContext

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for SyntaxContext

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

Formats the value using the given formatter. Read more
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impl Default for SyntaxContext

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fn default() -> SyntaxContext

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for SyntaxContext

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

Deserialize this value from the given Serde deserializer. Read more
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impl<__D: Fallible + ?Sized> Deserialize<SyntaxContext, __D> for Archived<SyntaxContext>

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fn deserialize( &self, deserializer: &mut __D, ) -> Result<SyntaxContext, <__D as Fallible>::Error>

Deserializes using the given deserializer
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impl EqIgnoreSpan for SyntaxContext

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

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impl Hash for SyntaxContext

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for SyntaxContext

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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impl PartialEq for SyntaxContext

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<__S: Fallible + ?Sized> Serialize<__S> for SyntaxContext

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fn serialize( &self, serializer: &mut __S, ) -> Result<<Self as Archive>::Resolver, <__S as Fallible>::Error>

Writes the dependencies for the object and returns a resolver that can create the archived type.
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impl Serialize for SyntaxContext

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

Serialize this value into the given Serde serializer. Read more
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impl Copy for SyntaxContext

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impl Eq for SyntaxContext

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impl StructuralPartialEq for SyntaxContext

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where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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impl<T> ArchivePointee for T

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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata, ) -> <T as Pointee>::Metadata

Converts some archived metadata to the pointer metadata for itself.
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impl<T> ArchiveUnsized for T
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type Archived = <T as Archive>::Archived

The archived counterpart of this type. Unlike Archive, it may be unsized. Read more
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fn archived_metadata( &self, ) -> <<T as ArchiveUnsized>::Archived as ArchivePointee>::ArchivedMetadata

Creates the archived version of the metadata for this value.
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Compare self to key and return their ordering.
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