Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/mbe/src/expander.rs')
| -rw-r--r-- | crates/mbe/src/expander.rs | 41 |
1 files changed, 24 insertions, 17 deletions
diff --git a/crates/mbe/src/expander.rs b/crates/mbe/src/expander.rs index 908048c990..fac2b33758 100644 --- a/crates/mbe/src/expander.rs +++ b/crates/mbe/src/expander.rs @@ -7,15 +7,16 @@ mod transcriber; use rustc_hash::FxHashMap; use syntax::SmolStr; +use tt::Span; -use crate::{parser::MetaVarKind, tt, ExpandError, ExpandResult}; +use crate::{parser::MetaVarKind, ExpandError, ExpandResult}; -pub(crate) fn expand_rules( - rules: &[crate::Rule], - input: &tt::Subtree, +pub(crate) fn expand_rules<S: Span>( + rules: &[crate::Rule<S>], + input: &tt::Subtree<S>, is_2021: bool, -) -> ExpandResult<tt::Subtree> { - let mut match_: Option<(matcher::Match, &crate::Rule)> = None; +) -> ExpandResult<tt::Subtree<S>> { + let mut match_: Option<(matcher::Match<S>, &crate::Rule<S>)> = None; for rule in rules { let new_match = matcher::match_(&rule.lhs, input, is_2021); @@ -47,7 +48,7 @@ pub(crate) fn expand_rules( ExpandResult { value, err: match_.err.or(transcribe_err) } } else { ExpandResult::new( - tt::Subtree { delimiter: tt::Delimiter::unspecified(), token_trees: vec![] }, + tt::Subtree { delimiter: tt::Delimiter::UNSPECIFIED, token_trees: vec![] }, ExpandError::NoMatchingRule, ) } @@ -98,23 +99,29 @@ pub(crate) fn expand_rules( /// In other words, `Bindings` is a *multi* mapping from `SmolStr` to /// `tt::TokenTree`, where the index to select a particular `TokenTree` among /// many is not a plain `usize`, but a `&[usize]`. -#[derive(Debug, Default, Clone, PartialEq, Eq)] -struct Bindings { - inner: FxHashMap<SmolStr, Binding>, +#[derive(Debug, Clone, PartialEq, Eq)] +struct Bindings<S> { + inner: FxHashMap<SmolStr, Binding<S>>, +} + +impl<S> Default for Bindings<S> { + fn default() -> Self { + Self { inner: Default::default() } + } } #[derive(Debug, Clone, PartialEq, Eq)] -enum Binding { - Fragment(Fragment), - Nested(Vec<Binding>), +enum Binding<S> { + Fragment(Fragment<S>), + Nested(Vec<Binding<S>>), Empty, Missing(MetaVarKind), } #[derive(Debug, Clone, PartialEq, Eq)] -enum Fragment { +enum Fragment<S> { /// token fragments are just copy-pasted into the output - Tokens(tt::TokenTree), + Tokens(tt::TokenTree<S>), /// Expr ast fragments are surrounded with `()` on insertion to preserve /// precedence. Note that this impl is different from the one currently in /// `rustc` -- `rustc` doesn't translate fragments into token trees at all. @@ -122,7 +129,7 @@ enum Fragment { /// At one point in time, we tried to use "fake" delimiters here à la /// proc-macro delimiter=none. As we later discovered, "none" delimiters are /// tricky to handle in the parser, and rustc doesn't handle those either. - Expr(tt::TokenTree), + Expr(tt::TokenTree<S>), /// There are roughly two types of paths: paths in expression context, where a /// separator `::` between an identifier and its following generic argument list /// is mandatory, and paths in type context, where `::` can be omitted. @@ -132,5 +139,5 @@ enum Fragment { /// and is trasncribed as an expression-context path, verbatim transcription /// would cause a syntax error. We need to fix it up just before transcribing; /// see `transcriber::fix_up_and_push_path_tt()`. - Path(tt::TokenTree), + Path(tt::TokenTree<S>), } |