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Early quit loop when body returns error 🛑

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This commit is contained in:
Laurenz 2021-02-12 23:06:04 +01:00
parent 790dc9e667
commit 58f799c41c
2 changed files with 27 additions and 18 deletions
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38
src/eval/mod.rs
View File

@ -429,57 +429,59 @@ impl Eval for ExprFor {
fn eval(&self, ctx: &mut EvalContext) -> Self::Output {
macro_rules! iter {
(for ($($binding:ident => $value:ident),*) in $iter:expr) => {{
(for ($($binding:ident => $value:ident),*) in $iter:expr) => {
let mut output = vec![];
ctx.scopes.push();
#[allow(unused_parens)]
for ($($value),*) in $iter {
$(ctx.scopes.def_mut($binding.as_str(), $value);)*
if let Value::Template(new) = self.body.eval(ctx) {
output.extend(new);
match self.body.eval(ctx) {
Value::Template(new) => output.extend(new),
Value::Error => {
ctx.scopes.pop();
return Value::Error;
}
_ => {}
}
}
Value::Template(output)
}};
ctx.scopes.pop();
return Value::Template(output);
};
}
ctx.scopes.push();
let iter = self.iter.eval(ctx);
let value = match (self.pattern.clone(), iter) {
match (self.pattern.clone(), iter) {
(ForPattern::Value(v), Value::Str(string)) => {
iter!(for (v => value) in string.chars().map(|c| Value::Str(c.into())))
iter!(for (v => value) in string.chars().map(|c| Value::Str(c.into())));
}
(ForPattern::Value(v), Value::Array(array)) => {
iter!(for (v => value) in array.into_iter())
iter!(for (v => value) in array.into_iter());
}
(ForPattern::Value(v), Value::Dict(dict)) => {
iter!(for (v => value) in dict.into_iter().map(|p| p.1))
iter!(for (v => value) in dict.into_iter().map(|p| p.1));
}
(ForPattern::KeyValue(k, v), Value::Dict(dict)) => {
iter!(for (k => key, v => value) in dict.into_iter())
iter!(for (k => key, v => value) in dict.into_iter());
}
(ForPattern::KeyValue(_, _), Value::Str(_))
| (ForPattern::KeyValue(_, _), Value::Array(_)) => {
ctx.diag(error!(self.pattern.span(), "mismatched pattern"));
Value::Error
}
(_, Value::Error) => Value::Error,
(_, Value::Error) => {}
(_, iter) => {
ctx.diag(error!(
self.iter.span(),
"cannot loop over {}",
iter.type_name(),
));
Value::Error
}
};
}
ctx.scopes.pop();
value
Value::Error
}
}

7
tests/lang/typ/for-loop.typ
View File

@ -42,3 +42,10 @@
// Make sure that we don't complain twice.
// Error: 12-19 cannot add integer and string
#for v #in 1 + "2" {}
// Error: 14-17 cannot apply '-' to string
#let error = -""
#let result = #for v #in (1, 2, 3) {
#if v < 2 [Ok] #else {error}
}
#[test result, error]