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Add mbe expand limit and poision macro set

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This commit is contained in:
Edwin Cheng 2019-04-22 15:33:55 +08:00
parent bbc5c1d24e
commit b177813f3b
5 changed files with 216 additions and 18 deletions
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13
crates/ra_mbe/src/subtree_parser.rs
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@ -5,6 +5,7 @@ use ra_syntax::{SyntaxKind};
struct OffsetTokenSink {
token_pos: usize,
error: bool,
}
impl TreeSink for OffsetTokenSink {
@ -13,7 +14,9 @@ impl TreeSink for OffsetTokenSink {
}
fn start_node(&mut self, _kind: SyntaxKind) {}
fn finish_node(&mut self) {}
fn error(&mut self, _error: ra_parser::ParseError) {}
fn error(&mut self, _error: ra_parser::ParseError) {
self.error = true;
}
}
pub(crate) struct Parser<'a> {
@ -67,11 +70,15 @@ impl<'a> Parser<'a> {
F: FnOnce(&dyn TokenSource, &mut dyn TreeSink),
{
let mut src = SubtreeTokenSource::new(&self.subtree.token_trees[*self.cur_pos..]);
let mut sink = OffsetTokenSink { token_pos: 0 };
let mut sink = OffsetTokenSink { token_pos: 0, error: false };
f(&src, &mut sink);
self.finish(sink.token_pos, &mut src)
let r = self.finish(sink.token_pos, &mut src);
if sink.error {
return None;
}
r
}
fn finish(self, parsed_token: usize, src: &mut SubtreeTokenSource) -> Option<tt::TokenTree> {