Struct rustc_expand::mbe::macro_parser::TtParser

pub struct TtParser {
    macro_name: Ident,
    cur_mps: Vec<MatcherPos>,
    next_mps: Vec<MatcherPos>,
    bb_mps: Vec<MatcherPos>,
    empty_matches: Lrc<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: Lrc<Vec<NamedMatch>>

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

Implementations

impl TtParser

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

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

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

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.

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>>

Match the token stream from parser against matcher.

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

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

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: 96 bytes