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This commit is contained in:
Aleksey Kladov 2018-08-28 00:42:13 +03:00
parent 8f5330cb07
commit 13110f48e9
3 changed files with 21 additions and 3 deletions
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10
crates/libsyntax2/src/parser_impl/mod.rs
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@ -1,6 +1,8 @@
mod event;
mod input;
use std::cell::Cell;
use {
lexer::Token,
parser_api::Parser,
@ -51,6 +53,7 @@ pub(crate) struct ParserImpl<'t> {
pos: InputPosition,
events: Vec<Event>,
steps: Cell<u32>,
}
impl<'t> ParserImpl<'t> {
@ -60,6 +63,7 @@ impl<'t> ParserImpl<'t> {
pos: InputPosition::new(),
events: Vec::new(),
steps: Cell::new(0),
}
}
@ -91,6 +95,12 @@ impl<'t> ParserImpl<'t> {
}
pub(super) fn nth(&self, n: u32) -> SyntaxKind {
let steps = self.steps.get();
if steps > 10_000_000 {
panic!("the parser seems stuck");
}
self.steps.set(steps + 1);
self.inp.kind(self.pos + n)
}