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Scoped for loop bindings 🏔️

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Previously for loop bindings were leaked until after the loop.
This commit is contained in:
Laurenz 2021-01-30 16:26:21 +01:00
parent 5943f552e5
commit bcb2c46a10
1 changed files with 26 additions and 19 deletions
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45
src/eval/mod.rs
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@ -410,11 +410,10 @@ impl Eval for Spanned<&ExprFor> {
type Output = Value;
fn eval(self, ctx: &mut EvalContext) -> Self::Output {
let iter = self.v.iter.eval(ctx);
let mut output = vec![];
macro_rules! iterate {
(for ($($binding:ident => $value:ident),*) in $iter:expr) => {
(for ($($binding:ident => $value:ident),*) in $iter:expr) => {{
let mut output = vec![];
#[allow(unused_parens)]
for ($($value),*) in $iter {
$(ctx.scopes.def_mut($binding.as_str(), $value);)*
@ -424,37 +423,45 @@ impl Eval for Spanned<&ExprFor> {
}
}
return Value::Template(output);
};
Value::Template(output)
}};
}
match (self.v.pat.v.clone(), iter) {
ctx.scopes.push();
let iter = self.v.iter.eval(ctx);
let value = match (self.v.pat.v.clone(), iter) {
(ForPattern::Value(v), Value::Str(string)) => {
iterate!(for (v => value) in string.chars().map(|c| Value::Str(c.into())));
iterate!(for (v => value) in string.chars().map(|c| Value::Str(c.into())))
}
(ForPattern::Value(v), Value::Array(array)) => {
iterate!(for (v => value) in array.into_iter());
iterate!(for (v => value) in array.into_iter())
}
(ForPattern::Value(v), Value::Dict(dict)) => {
iterate!(for (v => value) in dict.into_iter().map(|p| p.1));
iterate!(for (v => value) in dict.into_iter().map(|p| p.1))
}
(ForPattern::KeyValue(k, v), Value::Dict(dict)) => {
iterate!(for (k => key, v => value) in dict.into_iter());
iterate!(for (k => key, v => value) in dict.into_iter())
}
(ForPattern::KeyValue(..), Value::Str(_))
| (ForPattern::KeyValue(..), Value::Array(_)) => {
ctx.diag(error!(self.v.pat.span, "mismatched pattern"));
Value::Error
}
(_, Value::Error) => {}
(_, iter) => ctx.diag(error!(
self.v.iter.span,
"cannot loop over {}",
iter.type_name(),
)),
}
(_, Value::Error) => Value::Error,
(_, iter) => {
ctx.diag(error!(
self.v.iter.span,
"cannot loop over {}",
iter.type_name(),
));
Value::Error
}
};
Value::Error
ctx.scopes.pop();
value
}
}