rustc_expand::mbe::macro_parser

Struct MatcherPos

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struct MatcherPos {
    idx: usize,
    matches: Rc<Vec<NamedMatch>>,
}
Expand description

A single matcher position, representing the state of matching.

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§idx: usize

The index into TtParser::locs, which represents the “dot”.

§matches: Rc<Vec<NamedMatch>>

The matches made against metavar decls so far. On a successful match, this vector ends up with one element per metavar decl in the matcher. Each element records token trees matched against the relevant metavar by the black box parser. An element will be a MatchedSeq if the corresponding metavar decl is within a sequence.

It is critical to performance that this is an Rc, because it gets cloned frequently when processing sequences. Mostly for sequence-ending possibilities that must be tried but end up failing.

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impl MatcherPos

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fn push_match(&mut self, metavar_idx: usize, seq_depth: usize, m: NamedMatch)

Adds m as a named match for the metavar_idx-th metavar. There are only two call sites, and both are hot enough to be always worth inlining.

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impl Debug for MatcherPos

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

Formats the value using the given formatter. Read more

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const ALIGN: Alignment = _

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
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Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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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: 16 bytes