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fix two exponential parse time blow-ups

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This commit is contained in:
Dennis Ranke
2021-11-21 22:41:00 +01:00
parent 788a5657b5
commit c0140d0671
1 changed files with 23 additions and 25 deletions
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36
src/parser.rs
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@@ -388,16 +388,6 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = Simple<Token>> + C
})
.boxed();
let tee = identifier
.clone()
.then_ignore(just(Token::Op(":=".to_string())))
.then(expression.clone())
.map(|(name, value)| ast::Expr::LocalTee {
name,
value: Box::new(value),
})
.boxed();
let assign = identifier
.clone()
.then_ignore(just(Token::Op("=".to_string())))
@@ -443,7 +433,6 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = Simple<Token>> + C
});
let atom = val
.or(tee)
.or(function_call)
.or(assign)
.or(local_tee)
@@ -560,23 +549,31 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = Simple<Token>> + C
let memory_op = op_cast
.clone()
.or(short_memory_op.clone())
.then(mem_op.clone().repeated().at_least(1))
.then(
mem_op
.clone()
.repeated()
.at_least(1)
.then(
just(Token::Op("=".to_string()))
.ignore_then(expression.clone())
.or_not(),
)
.map(|((left, mut peek_ops), poke_op)| {
.or_not(),
)
.map(|(left, ops)| {
if let Some((mut peek_ops, poke_op)) = ops {
if let Some(value) = poke_op {
let poke_op = Some((peek_ops.pop().unwrap(), value));
make_memory_op(left, peek_ops, poke_op)
} else {
make_memory_op(left, peek_ops, None)
}
} else {
left
}
})
.boxed()
.or(op_cast.clone())
.or(short_memory_op.clone());
.boxed();
let op_product = memory_op
.clone()
@@ -715,10 +712,11 @@ fn script_parser() -> impl Parser<Token, ast::Script, Error = Simple<Token>> + C
let block_expression = block_expression.unwrap();
expression
block_expression
.clone()
.then(just(Token::Ctrl(';')).to(false))
.or(block_expression.map_with_span(|expr, span| (expr.with_span(span), true)))
.then(just(Token::Ctrl(';')).or_not())
.map_with_span(|(expr, semi), span| (expr.with_span(span), semi.is_none()))
.or(expression.clone().then(just(Token::Ctrl(';')).to(false)))
.repeated()
.then(expression.clone().or_not())
.map_with_span(|(mut statements, mut final_expression), span| {