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tuple constant indexing now supported

This commit is contained in:
CrescentonC 2021-07-16 13:00:30 +08:00
parent be512985a7
commit de82fbabd8
1 changed files with 37 additions and 24 deletions
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27
nac3core/src/typecheck/expression_inference.rs
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@ -266,12 +266,8 @@ impl<'a> InferenceContext<'a> {
}
fn infer_subscript(&self, value: &Box<ast::Expr<Option<Type>>>, slice: &Box<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
let t = if let TypeEnum::ParametricType(primitives::LIST_TYPE, ls) = value.custom.as_ref().ok_or_else(|| "no value".to_string())?.as_ref() {
ls[0].clone()
} else {
return Err("subscript is not supported for types other than list".into());
};
let val_type = value.custom.as_ref().ok_or_else(|| "no value".to_string())?.as_ref();
if let TypeEnum::ParametricType(primitives::LIST_TYPE, ls) = val_type {
if let ast::ExprKind::Slice {lower, upper, step} = &slice.node {
let int32_type = self.get_primitive(primitives::INT32_TYPE);
let l = lower.as_ref().map_or(
@ -290,10 +286,24 @@ impl<'a> InferenceContext<'a> {
Err("slice must be int32 type".into())
}
} else if slice.custom == Some(self.get_primitive(primitives::INT32_TYPE)) {
Ok(Some(t))
Ok(Some(ls[0].clone()))
} else {
Err("slice or index must be int32 type".into())
}
} else if let TypeEnum::ParametricType(primitives::TUPLE_TYPE, ls) = val_type {
if let ast::ExprKind::Constant {kind: _, value: ast::Constant::Int(val)} = &slice.node {
let ind: Result<usize, _> = val.try_into();
if ind.is_ok() && ind.unwrap() < ls.len() {
Ok(Some(ls[ind.unwrap()].clone()))
} else {
Err("tuple constant index out of range".into())
}
} else {
Err("tuple index can only be constant".into())
}
} else {
Err("subscript is not supported for types other than list or tuple".into())
}
}
fn infer_if_expr(&self, test: &Box<ast::Expr<Option<Type>>>, body: &Box<ast::Expr<Option<Type>>>, orelse: &Box<ast::Expr<Option<Type>>>) -> Result<Option<Type>, String> {
@ -631,6 +641,7 @@ pub mod test {
let ast8 = rustpython_parser::parser::parse_expression("[[(1, 2), (2, 3), (3, 4)], [(2, 4), (4, 6)]][0]").unwrap();
let ast9 = rustpython_parser::parser::parse_expression("[1, 2, 3, 4, 5][1: 2]").unwrap();
let ast10 = rustpython_parser::parser::parse_expression("4 if False and True else 8").unwrap();
let ast11 = rustpython_parser::parser::parse_expression("(1, 2, 3, 4)[1]").unwrap();
let folded = inf.fold_expr(ast1).unwrap();
let folded_2 = Premapper.fold_expr(ast2).unwrap();
@ -642,6 +653,7 @@ pub mod test {
let folded_8 = inf.fold_expr(ast8).unwrap();
let folded_9 = inf.fold_expr(ast9).unwrap();
let folded_10 = inf.fold_expr(ast10).unwrap();
let folded_11 = inf.fold_expr(ast11).unwrap();
println!("{:?}", folded.custom);
println!("{:?}", folded_2.custom);
@ -653,6 +665,7 @@ pub mod test {
println!("{:?}", folded_8.custom);
println!("{:?}", folded_9.custom);
println!("{:?}", folded_10.custom);
println!("{:?}", folded_11.custom);
}
}