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Catch unsupported custom syntax.

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This commit is contained in:
Stephen Chung 2022-01-10 20:08:03 +08:00
parent ea6c264f5f
commit 5d90b3274c
1 changed files with 7 additions and 1 deletions
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8
src/eval/expr.rs
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@ -419,7 +419,13 @@ impl Engine {
Expr::Custom(custom, _) => { Expr::Custom(custom, _) => {
let expressions: StaticVec<_> = custom.inputs.iter().map(Into::into).collect(); let expressions: StaticVec<_> = custom.inputs.iter().map(Into::into).collect();
let key_token = custom.tokens.first().unwrap(); let key_token = custom.tokens.first().unwrap();
let custom_def = self.custom_syntax.get(key_token).unwrap(); let custom_def = self.custom_syntax.get(key_token).ok_or_else(|| {
let code: Vec<_> = custom.tokens.iter().map(|s| s.as_str()).collect();
Box::new(ERR::ErrorSystem(
format!("Invalid custom syntax prefix: {}", key_token),
code.join(" ").into(),
))
})?;
let mut context = EvalContext { let mut context = EvalContext {
engine: self, engine: self,
scope, scope,