Struct rustc_expand::mbe::macro_parser::TtParser

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pub(crate) struct TtParser {
    macro_name: Ident,
    cur_mps: Vec<MatcherPos>,
    next_mps: Vec<MatcherPos>,
    bb_mps: Vec<MatcherPos>,
    empty_matches: Rc<Vec<NamedMatch>>,
}

Fields§

§macro_name: Ident§cur_mps: Vec<MatcherPos>

The set of current mps to be processed. This should be empty by the end of a successful execution of parse_tt_inner.

§next_mps: Vec<MatcherPos>

The set of newly generated mps. These are used to replenish cur_mps in the function parse_tt.

§bb_mps: Vec<MatcherPos>

The set of mps that are waiting for the black-box parser.

§empty_matches: Rc<Vec<NamedMatch>>

Pre-allocate an empty match array, so it can be cloned cheaply for macros with many rules that have no metavars.

Implementations§

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impl TtParser

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pub(super) fn new(macro_name: Ident) -> TtParser

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pub(super) fn has_no_remaining_items_for_step(&self) -> bool

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fn parse_tt_inner<'matcher, T: Tracker<'matcher>>( &mut self, matcher: &'matcher [MatcherLoc], token: &Token, approx_position: u32, track: &mut T, ) -> Option<ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>, T::Failure>>

Process the matcher positions of cur_mps until it is empty. In the process, this will produce more mps in next_mps and bb_mps.

§Returns

Some(result) if everything is finished, None otherwise. Note that matches are kept track of through the mps generated.

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pub(super) fn parse_tt<'matcher, T: Tracker<'matcher>>( &mut self, parser: &mut Cow<'_, Parser<'_>>, matcher: &'matcher [MatcherLoc], track: &mut T, ) -> ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>, T::Failure>

Match the token stream from parser against matcher.

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fn ambiguity_error<F>( &self, matcher: &[MatcherLoc], token_span: Span, ) -> ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>, F>

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fn nameize<I: Iterator<Item = NamedMatch>, F>( &self, matcher: &[MatcherLoc], res: I, ) -> ParseResult<FxHashMap<MacroRulesNormalizedIdent, NamedMatch>, F>

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Size: 96 bytes