[][src]Struct syntax_pos::hygiene::SyntaxContext

pub struct SyntaxContext(_);

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

Methods

impl SyntaxContext[src]

pub const fn empty() -> Self[src]

pub fn allocate_directly(expansion_info: ExpnInfo) -> Self[src]

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

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

pub fn apply_mark_with_transparency(
    self,
    mark: Mark,
    transparency: Transparency
) -> SyntaxContext
[src]

Extend a syntax context with a given mark and transparency

pub fn remove_mark(&mut self) -> Mark[src]

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 marks(self) -> Vec<(Mark, Transparency)>[src]

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

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).

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

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).

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

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));
}

pub fn modern(self) -> SyntaxContext[src]

pub fn modern_and_legacy(self) -> SyntaxContext[src]

pub fn outer(self) -> Mark[src]

pub fn dollar_crate_name(self) -> Symbol[src]

pub fn set_dollar_crate_name(self, dollar_crate_name: Symbol)[src]

Trait Implementations

impl Eq for SyntaxContext[src]

impl Copy for SyntaxContext[src]

impl PartialOrd<SyntaxContext> for SyntaxContext[src]

impl PartialEq<SyntaxContext> for SyntaxContext[src]

impl Clone for SyntaxContext[src]

default fn clone_from(&mut self, source: &Self)
1.0.0
[src]

Performs copy-assignment from source. Read more

impl Default for SyntaxContext[src]

impl Ord for SyntaxContext[src]

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[src]

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval. Read more

impl Debug for SyntaxContext[src]

impl Hash for SyntaxContext[src]

default fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher
1.3.0
[src]

Feeds a slice of this type into the given [Hasher]. Read more

impl Encodable for SyntaxContext[src]

impl Decodable for SyntaxContext[src]

Auto Trait Implementations

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

impl<T> From for T[src]

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Encodable for T where
    T: UseSpecializedEncodable + ?Sized
[src]

impl<T> Decodable for T where
    T: UseSpecializedDecodable
[src]

impl<E> SpecializationError for E[src]

impl<T> Erased for T[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]