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mbe: split Op::Leaf and handle multi-character puncts

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This commit is contained in:
Ryo Yoshida 2022-12-27 18:18:18 +09:00
parent 47c6c8e2f3
commit ec7148b091
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GPG key ID: E25698A930586171
6 changed files with 183 additions and 56 deletions
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8
crates/mbe/src/benchmark.rs
View file

@ -141,7 +141,13 @@ fn invocation_fixtures(rules: &FxHashMap<String, DeclarativeMacro>) -> Vec<(Stri
None => (),
Some(kind) => panic!("Unhandled kind {kind:?}"),
},
Op::Leaf(leaf) => parent.token_trees.push(leaf.clone().into()),
Op::Literal(it) => parent.token_trees.push(tt::Leaf::from(it.clone()).into()),
Op::Ident(it) => parent.token_trees.push(tt::Leaf::from(it.clone()).into()),
Op::Punct(puncts) => {
for punct in puncts {
parent.token_trees.push(tt::Leaf::from(punct.clone()).into());
}
}
Op::Repeat { tokens, kind, separator } => {
let max = 10;
let cnt = match kind {

128
crates/mbe/src/expander/matcher.rs
View file

@ -68,7 +68,7 @@ use crate::{
expander::{Binding, Bindings, ExpandResult, Fragment},
parser::{MetaVarKind, Op, RepeatKind, Separator},
tt_iter::TtIter,
ExpandError, MetaTemplate,
ExpandError, MetaTemplate, ValueResult,
};
impl Bindings {
@ -500,18 +500,69 @@ fn match_loop_inner<'t>(
}
}
}
OpDelimited::Op(Op::Leaf(leaf)) => {
if let Err(err) = match_leaf(leaf, &mut src.clone()) {
res.add_err(err);
item.is_error = true;
OpDelimited::Op(Op::Literal(lhs)) => {
if let Ok(rhs) = src.clone().expect_leaf() {
if matches!(rhs, tt::Leaf::Literal(it) if it.text == lhs.text) {
item.dot.next();
} else {
res.add_err(ExpandError::UnexpectedToken);
item.is_error = true;
}
} else {
item.dot.next();
res.add_err(ExpandError::binding_error(format!("expected literal: `{lhs}`")));
item.is_error = true;
}
try_push!(next_items, item);
}
OpDelimited::Op(Op::Ident(lhs)) => {
if let Ok(rhs) = src.clone().expect_leaf() {
if matches!(rhs, tt::Leaf::Ident(it) if it.text == lhs.text) {
item.dot.next();
} else {
res.add_err(ExpandError::UnexpectedToken);
item.is_error = true;
}
} else {
res.add_err(ExpandError::binding_error(format!("expected ident: `{lhs}`")));
item.is_error = true;
}
try_push!(next_items, item);
}
OpDelimited::Op(Op::Punct(lhs)) => {
let mut fork = src.clone();
let error = if let Ok(rhs) = fork.expect_glued_punct() {
let first_is_single_quote = rhs[0].char == '\'';
let lhs = lhs.iter().map(|it| it.char);
let rhs = rhs.iter().map(|it| it.char);
if lhs.clone().eq(rhs) {
// HACK: here we use `meta_result` to pass `TtIter` back to caller because
// it might have been advanced multiple times. `ValueResult` is
// insignificant.
item.meta_result = Some((fork, ValueResult::ok(None)));
item.dot.next();
next_items.push(item);
continue;
}
if first_is_single_quote {
// If the first punct token is a single quote, that's a part of a lifetime
// ident, not a punct.
ExpandError::UnexpectedToken
} else {
let lhs: SmolStr = lhs.collect();
ExpandError::binding_error(format!("expected punct: `{lhs}`"))
}
} else {
ExpandError::UnexpectedToken
};
res.add_err(error);
item.is_error = true;
error_items.push(item);
}
OpDelimited::Op(Op::Ignore { .. } | Op::Index { .. }) => {}
OpDelimited::Open => {
if matches!(src.clone().next(), Some(tt::TokenTree::Subtree(..))) {
if matches!(src.peek_n(0), Some(tt::TokenTree::Subtree(..))) {
item.dot.next();
try_push!(next_items, item);
}
@ -616,21 +667,33 @@ fn match_loop(pattern: &MetaTemplate, src: &tt::Subtree) -> Match {
}
// Dump all possible `next_items` into `cur_items` for the next iteration.
else if !next_items.is_empty() {
if let Some((iter, _)) = next_items[0].meta_result.take() {
// We've matched a possibly "glued" punct. The matched punct (hence
// `meta_result` also) must be the same for all items.
// FIXME: If there are multiple items, it's definitely redundant (and it's hacky!
// `meta_result` isn't supposed to be used this way).
// We already bumped, so no need to call `.next()` like in the other branch.
src = iter;
for item in next_items.iter_mut() {
item.meta_result = None;
}
} else {
match src.next() {
Some(tt::TokenTree::Subtree(subtree)) => {
stack.push(src.clone());
src = TtIter::new(subtree);
}
None => {
if let Some(iter) = stack.pop() {
src = iter;
}
}
_ => (),
}
}
// Now process the next token
cur_items.extend(next_items.drain(..));
match src.next() {
Some(tt::TokenTree::Subtree(subtree)) => {
stack.push(src.clone());
src = TtIter::new(subtree);
}
None => {
if let Some(iter) = stack.pop() {
src = iter;
}
}
_ => (),
}
}
// Finally, we have the case where we need to call the black-box parser to get some
// nonterminal.
@ -663,27 +726,6 @@ fn match_loop(pattern: &MetaTemplate, src: &tt::Subtree) -> Match {
}
}
fn match_leaf(lhs: &tt::Leaf, src: &mut TtIter<'_>) -> Result<(), ExpandError> {
let rhs = src
.expect_leaf()
.map_err(|()| ExpandError::binding_error(format!("expected leaf: `{lhs}`")))?;
match (lhs, rhs) {
(
tt::Leaf::Punct(tt::Punct { char: lhs, .. }),
tt::Leaf::Punct(tt::Punct { char: rhs, .. }),
) if lhs == rhs => Ok(()),
(
tt::Leaf::Ident(tt::Ident { text: lhs, .. }),
tt::Leaf::Ident(tt::Ident { text: rhs, .. }),
) if lhs == rhs => Ok(()),
(
tt::Leaf::Literal(tt::Literal { text: lhs, .. }),
tt::Leaf::Literal(tt::Literal { text: rhs, .. }),
) if lhs == rhs => Ok(()),
_ => Err(ExpandError::UnexpectedToken),
}
}
fn match_meta_var(kind: MetaVarKind, input: &mut TtIter<'_>) -> ExpandResult<Option<Fragment>> {
let fragment = match kind {
MetaVarKind::Path => parser::PrefixEntryPoint::Path,
@ -756,10 +798,10 @@ fn collect_vars(collector_fun: &mut impl FnMut(SmolStr), pattern: &MetaTemplate)
for op in pattern.iter() {
match op {
Op::Var { name, .. } => collector_fun(name.clone()),
Op::Leaf(_) => (),
Op::Subtree { tokens, .. } => collect_vars(collector_fun, tokens),
Op::Repeat { tokens, .. } => collect_vars(collector_fun, tokens),
Op::Ignore { .. } | Op::Index { .. } => {}
Op::Ignore { .. } | Op::Index { .. } | Op::Literal(_) | Op::Ident(_) | Op::Punct(_) => {
}
}
}
}

8
crates/mbe/src/expander/transcriber.rs
View file

@ -134,7 +134,13 @@ fn expand_subtree(
let mut err = None;
for op in template.iter() {
match op {
Op::Leaf(tt) => arena.push(tt.clone().into()),
Op::Literal(it) => arena.push(tt::Leaf::from(it.clone()).into()),
Op::Ident(it) => arena.push(tt::Leaf::from(it.clone()).into()),
Op::Punct(puncts) => {
for punct in puncts {
arena.push(tt::Leaf::from(punct.clone()).into());
}
}
Op::Subtree { tokens, delimiter } => {
let ExpandResult { value: tt, err: e } =
expand_subtree(ctx, tokens, *delimiter, arena);

44
crates/mbe/src/parser.rs
View file

@ -1,7 +1,7 @@
//! Parser recognizes special macro syntax, `$var` and `$(repeat)*`, in token
//! trees.
use smallvec::SmallVec;
use smallvec::{smallvec, SmallVec};
use syntax::SmolStr;
use crate::{tt_iter::TtIter, ParseError};
@ -39,7 +39,7 @@ impl MetaTemplate {
let mut src = TtIter::new(tt);
let mut res = Vec::new();
while let Some(first) = src.next() {
while let Some(first) = src.peek_n(0) {
let op = next_op(first, &mut src, mode)?;
res.push(op);
}
@ -54,8 +54,10 @@ pub(crate) enum Op {
Ignore { name: SmolStr, id: tt::TokenId },
Index { depth: u32 },
Repeat { tokens: MetaTemplate, kind: RepeatKind, separator: Option<Separator> },
Leaf(tt::Leaf),
Subtree { tokens: MetaTemplate, delimiter: Option<tt::Delimiter> },
Literal(tt::Literal),
Punct(SmallVec<[tt::Punct; 3]>),
Ident(tt::Ident),
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
@ -124,12 +126,17 @@ enum Mode {
Template,
}
fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Result<Op, ParseError> {
let res = match first {
tt::TokenTree::Leaf(leaf @ tt::Leaf::Punct(tt::Punct { char: '$', .. })) => {
fn next_op<'a>(
first_peeked: &tt::TokenTree,
src: &mut TtIter<'a>,
mode: Mode,
) -> Result<Op, ParseError> {
let res = match first_peeked {
tt::TokenTree::Leaf(tt::Leaf::Punct(p @ tt::Punct { char: '$', .. })) => {
src.next().expect("first token already peeked");
// Note that the '$' itself is a valid token inside macro_rules.
let second = match src.next() {
None => return Ok(Op::Leaf(leaf.clone())),
None => return Ok(Op::Punct(smallvec![p.clone()])),
Some(it) => it,
};
match second {
@ -160,7 +167,7 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
tt::TokenTree::Leaf(leaf) => match leaf {
tt::Leaf::Ident(ident) if ident.text == "crate" => {
// We simply produce identifier `$crate` here. And it will be resolved when lowering ast to Path.
Op::Leaf(tt::Leaf::from(tt::Ident { text: "$crate".into(), id: ident.id }))
Op::Ident(tt::Ident { text: "$crate".into(), id: ident.id })
}
tt::Leaf::Ident(ident) => {
let kind = eat_fragment_kind(src, mode)?;
@ -180,7 +187,7 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
"`$$` is not allowed on the pattern side",
))
}
Mode::Template => Op::Leaf(tt::Leaf::Punct(*punct)),
Mode::Template => Op::Punct(smallvec![*punct]),
},
tt::Leaf::Punct(_) | tt::Leaf::Literal(_) => {
return Err(ParseError::expected("expected ident"))
@ -188,8 +195,25 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
},
}
}
tt::TokenTree::Leaf(tt) => Op::Leaf(tt.clone()),
tt::TokenTree::Leaf(tt::Leaf::Literal(it)) => {
src.next().expect("first token already peeked");
Op::Literal(it.clone())
}
tt::TokenTree::Leaf(tt::Leaf::Ident(it)) => {
src.next().expect("first token already peeked");
Op::Ident(it.clone())
}
tt::TokenTree::Leaf(tt::Leaf::Punct(_)) => {
// There's at least one punct so this shouldn't fail.
let puncts = src.expect_glued_punct().unwrap();
Op::Punct(puncts)
}
tt::TokenTree::Subtree(subtree) => {
src.next().expect("first token already peeked");
let tokens = MetaTemplate::parse(subtree, mode)?;
Op::Subtree { tokens, delimiter: subtree.delimiter }
}

6
crates/mbe/src/tt_iter.rs
View file

@ -88,6 +88,10 @@ impl<'a> TtIter<'a> {
}
}
/// Returns consecutive `Punct`s that can be glued together.
///
/// This method currently may return a single quotation, which is part of lifetime ident and
/// conceptually not a punct in the context of mbe. Callers should handle this.
pub(crate) fn expect_glued_punct(&mut self) -> Result<SmallVec<[tt::Punct; 3]>, ()> {
let tt::TokenTree::Leaf(tt::Leaf::Punct(first)) = self.next().ok_or(())?.clone() else {
return Err(());
@ -182,7 +186,7 @@ impl<'a> TtIter<'a> {
ExpandResult { value: res, err }
}
pub(crate) fn peek_n(&self, n: usize) -> Option<&tt::TokenTree> {
pub(crate) fn peek_n(&self, n: usize) -> Option<&'a tt::TokenTree> {
self.inner.as_slice().get(n)
}
}