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Add a way to specify a parser stack limit #308

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Add a way to specify a parser stack limit #308

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2c674b3
allow for a way to specify stack limits
zsol Jun 29, 2022
b1c10f4
fix syntax error when cache + stack_limit used together
zsol Jun 30, 2022
b91bd0f
manage stack depth for left recursive rules too
zsol Jun 30, 2022
ffc07f8
run bootstrap again
zsol Jun 30, 2022
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20 changes: 14 additions & 6 deletions peg-macros/ast.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,12 +24,13 @@ impl Grammar {
pub enum Item {
Use(TokenStream),
Rule(Rule),
StackLimit(TokenStream),
}

#[derive(Debug)]
pub enum Cache {
Simple,
Recursive
Recursive,
}

#[derive(Debug)]
Expand Down Expand Up @@ -77,7 +78,11 @@ pub enum Expr {
MethodExpr(Ident, TokenStream),
ChoiceExpr(Vec<SpannedExpr>),
OptionalExpr(Box<SpannedExpr>),
Repeat { inner: Box<SpannedExpr>, bound: BoundedRepeat, sep: Option<Box<SpannedExpr>> },
Repeat {
inner: Box<SpannedExpr>,
bound: BoundedRepeat,
sep: Option<Box<SpannedExpr>>,
},
PosAssertExpr(Box<SpannedExpr>),
NegAssertExpr(Box<SpannedExpr>),
ActionExpr(Vec<TaggedExpr>, Option<Group>),
Expand All @@ -93,7 +98,10 @@ pub enum Expr {

impl Expr {
pub fn at(self, sp: Span) -> SpannedExpr {
SpannedExpr { expr: self, span:sp }
SpannedExpr {
expr: self,
span: sp,
}
}
}

Expand Down Expand Up @@ -127,14 +135,14 @@ impl BoundedRepeat {
pub fn has_lower_bound(&self) -> bool {
match self {
BoundedRepeat::None | BoundedRepeat::Both(None, _) => false,
BoundedRepeat::Plus | BoundedRepeat::Exact(_) | BoundedRepeat::Both(Some(_), _) => true
BoundedRepeat::Plus | BoundedRepeat::Exact(_) | BoundedRepeat::Both(Some(_), _) => true,
}
}

pub fn has_upper_bound(&self) -> bool {
match self {
BoundedRepeat::None | BoundedRepeat::Plus | BoundedRepeat::Both(_, None) => false,
BoundedRepeat::Exact(_) | BoundedRepeat::Both(_, Some(_)) => true
BoundedRepeat::None | BoundedRepeat::Plus | BoundedRepeat::Both(_, None) => false,
BoundedRepeat::Exact(_) | BoundedRepeat::Both(_, Some(_)) => true,
}
}
}
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