MatcherLoc

rustc_expand::mbe::macro_parser

Enum MatcherLoc 

Source 
pub(crate) enum MatcherLoc {
    Token {
        token: Token,
    },
    Delimited,
    Sequence {
        op: KleeneOp,
        num_metavar_decls: usize,
        idx_first_after: usize,
        next_metavar: usize,
        seq_depth: usize,
    },
    SequenceKleeneOpNoSep {
        op: KleeneOp,
        idx_first: usize,
    },
    SequenceSep {
        separator: Token,
    },
    SequenceKleeneOpAfterSep {
        idx_first: usize,
    },
    MetaVarDecl {
        span: Span,
        bind: Ident,
        kind: NonterminalKind,
        next_metavar: usize,
        seq_depth: usize,
    },
    Eof,
}
Expand description

A unit within a matcher that a MatcherPos can refer to. Similar to (and derived from) mbe::TokenTree, but designed specifically for fast and easy traversal during matching. Notable differences to mbe::TokenTree:

  • It is non-recursive, i.e. there is no nesting.
  • The end pieces of each sequence (the separator, if present, and the Kleene op) are represented explicitly, as is the very end of the matcher.

This means a matcher can be represented by &[MatcherLoc], and traversal mostly involves simply incrementing the current matcher position index by one.

Variants§

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Token

Fields

§token: Token
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Delimited

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Sequence

Fields

§op: KleeneOp
§num_metavar_decls: usize
§idx_first_after: usize
§next_metavar: usize
§seq_depth: usize
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SequenceKleeneOpNoSep

Fields

§op: KleeneOp
§idx_first: usize
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SequenceSep

Fields

§separator: Token
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SequenceKleeneOpAfterSep

Fields

§idx_first: usize
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MetaVarDecl

Fields

§span: Span
§bind: Ident
§kind: NonterminalKind
§next_metavar: usize
§seq_depth: usize
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Eof

Implementations§

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impl MatcherLoc

Source

pub(super) fn span(&self) -> Option<Span>

Trait Implementations§

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impl Clone for MatcherLoc

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fn clone(&self) -> MatcherLoc

Returns a duplicate 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 MatcherLoc

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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 Display for MatcherLoc

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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 PartialEq for MatcherLoc

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fn eq(&self, other: &MatcherLoc) -> 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 StructuralPartialEq for MatcherLoc

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> DynClone for T
where T: Clone,

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fn __clone_box(&self, _: Private) -> *mut ()

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ErasedDestructor for T
where T: 'static,

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: 40 bytes

Size for each variant:

  • Token: 27 bytes
  • Delimited: 0 bytes
  • Sequence: 39 bytes
  • SequenceKleeneOpNoSep: 15 bytes
  • SequenceSep: 27 bytes
  • SequenceKleeneOpAfterSep: 15 bytes
  • MetaVarDecl: 39 bytes
  • Eof: 0 bytes