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improve error messages 

#112, #110, #108, #87

Reviewed-on: M-Labs/nac3#145
Co-authored-by: ychenfo <yc@m-labs.hk>
Co-committed-by: ychenfo <yc@m-labs.hk>
This commit is contained in:
ychenfo 2021-12-22 08:52:19 +08:00 committed by sb10q
parent 0ff995722c
commit 66320679be
5 changed files with 158 additions and 85 deletions
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6
nac3artiq/src/lib.rs
View File

@ -437,7 +437,7 @@ impl Nac3 {
let (name, def_id, ty) = composer
.register_top_level(stmt.clone(), Some(resolver.clone()), path.clone())
.unwrap();
.map_err(|e| exceptions::PyRuntimeError::new_err(format!("nac3 compilation failure: {}", e)))?;
let id = *name_to_pyid.get(&name).unwrap();
id_to_def.insert(id, def_id);
if let Some(ty) = ty {
@ -515,7 +515,9 @@ impl Nac3 {
);
let signature = store.add_cty(signature);
composer.start_analysis(true).unwrap();
composer.start_analysis(true).map_err(|e| exceptions::PyRuntimeError::new_err(format!(
"nac3 compilation failure: {}", e
)))?;
let top_level = Arc::new(composer.make_top_level_context());
let instance = {
let defs = top_level.definitions.read();

4
nac3core/src/symbol_resolver.rs
View File

@ -298,10 +298,10 @@ pub fn parse_type_annotation<T>(
if let Name { id, .. } = &value.node {
subscript_name_handle(id, slice, unifier)
} else {
Err("unsupported type expression".into())
Err(format!("unsupported type expression at {}", expr.location))
}
}
_ => Err("unsupported type expression".into()),
_ => Err(format!("unsupported type expression at {}", expr.location)),
}
}

146
nac3core/src/toplevel/composer.rs
View File

@ -162,14 +162,24 @@ impl TopLevelComposer {
match &ast.node {
ast::StmtKind::ClassDef { name: class_name, body, .. } => {
if self.keyword_list.contains(class_name) {
return Err("cannot use keyword as a class name".into());
return Err(format!(
"cannot use keyword `{}` as a class name ({} at {})",
class_name,
mod_path,
ast.location
));
}
if !defined_names.insert({
let mut n = mod_path.clone();
n.push_str(&class_name.to_string());
n
}) {
return Err("duplicate definition of class".into());
return Err(format!(
"duplicate definition of class `{}` ({} at {})",
class_name,
mod_path,
ast.location
));
}
let class_name = *class_name;
@ -212,7 +222,12 @@ impl TopLevelComposer {
contains_constructor = true;
}
if self.keyword_list.contains(method_name) {
return Err("cannot use keyword as a method name".into());
return Err(format!(
"cannot use keyword `{}` as a method name ({} at {})",
method_name,
mod_path,
b.location
));
}
let global_class_method_name = {
let mut n = mod_path.clone();
@ -226,7 +241,12 @@ impl TopLevelComposer {
n
};
if !defined_names.insert(global_class_method_name.clone()) {
return Err("duplicate class method definition".into());
return Err(format!(
"class method `{}` defined twice ({} at {})",
&global_class_method_name[mod_path.len()..],
mod_path,
b.location
));
}
let method_def_id = self.definition_ast_list.len() + {
// plus 1 here since we already have the class def
@ -283,12 +303,17 @@ impl TopLevelComposer {
// return Err("cannot use keyword as a top level function name".into());
// }
let global_fun_name = {
let mut n = mod_path;
let mut n = mod_path.clone();
n.push_str(&name.to_string());
n
};
if !defined_names.insert(global_fun_name.clone()) {
return Err("duplicate top level function define".into());
return Err(format!(
"top level function `{}` defined twice ({} at {})",
&global_fun_name[mod_path.len()..],
mod_path,
ast.location
));
}
let fun_name = *name;
@ -314,7 +339,11 @@ impl TopLevelComposer {
))
}
_ => Err("only registrations of top level classes/functions are supported".into()),
_ => Err(format!(
"registrations of constructs other than top level classes/functions are not supported ({} at {})",
mod_path,
ast.location
)),
}
}
@ -376,7 +405,10 @@ impl TopLevelComposer {
if !is_generic {
is_generic = true;
} else {
return Err("Only single Generic[...] can be in bases".into());
return Err(format!(
"only single Generic[...] is allowed (at {})",
b.location
));
}
let type_var_list: Vec<&ast::Expr<()>>;
@ -414,7 +446,10 @@ impl TopLevelComposer {
})
};
if !all_unique_type_var {
return Err("expect unique type variables".into());
return Err(format!(
"duplicate type variable occurs (at {})",
slice.location
));
}
// add to TopLevelDef
@ -479,9 +514,11 @@ impl TopLevelComposer {
}
if has_base {
return Err("a class def can only have at most one base class \
declaration and one generic declaration"
.into());
return Err(format!(
"a class definition can only have at most one base class \
declaration and one generic declaration (at {})",
b.location
));
}
has_base = true;
@ -499,7 +536,10 @@ impl TopLevelComposer {
if let TypeAnnotation::CustomClass { .. } = &base_ty {
class_ancestors.push(base_ty);
} else {
return Err("class base declaration can only be custom class".into());
return Err(format!(
"class base declaration can only be custom class (at {})",
b.location,
));
}
}
}
@ -668,14 +708,14 @@ impl TopLevelComposer {
let arg_types = {
// make sure no duplicate parameter
let mut defined_paramter_name: HashSet<_> = HashSet::new();
let have_unique_fuction_parameter_name = args.args.iter().all(|x| {
defined_paramter_name.insert(x.node.arg)
&& !keyword_list.contains(&x.node.arg)
});
if !have_unique_fuction_parameter_name {
return Err("top level function must have unique parameter names \
and names thould not be the same as the keywords"
.into());
for x in args.args.iter() {
if !defined_paramter_name.insert(x.node.arg) || keyword_list.contains(&x.node.arg) {
return Err(format!(
"top level function must have unique parameter names \
and names should not be the same as the keywords (at {})",
x.location
));
}
}
let arg_with_default: Vec<(&ast::Located<ast::ArgData<()>>, Option<&ast::Expr>)> = args
@ -902,20 +942,22 @@ impl TopLevelComposer {
// check method parameters cannot have same name
let mut defined_paramter_name: HashSet<_> = HashSet::new();
let zelf: StrRef = "self".into();
let have_unique_fuction_parameter_name = args.args.iter().all(|x| {
defined_paramter_name.insert(x.node.arg)
&& (!keyword_list.contains(&x.node.arg) || x.node.arg == zelf)
});
if !have_unique_fuction_parameter_name {
return Err("class method must have unique parameter names \
and names thould not be the same as the keywords"
.into());
for x in args.args.iter() {
if !defined_paramter_name.insert(x.node.arg)
|| (keyword_list.contains(&x.node.arg) && x.node.arg != zelf) {
return Err(format!(
"top level function must have unique parameter names \
and names should not be the same as the keywords (at {})",
x.location
))
}
}
if name == &"__init__".into() && !defined_paramter_name.contains(&zelf) {
return Err("__init__ function must have a `self` parameter".into());
return Err(format!("__init__ method must have a `self` parameter (at {})", b.location));
}
if !defined_paramter_name.contains(&zelf) {
return Err("currently does not support static method".into());
return Err(format!("class method must have a `self` parameter (at {})", b.location));
}
let mut result = Vec::new();
@ -981,7 +1023,7 @@ impl TopLevelComposer {
None => None,
Some(default) => {
if name == "self".into() {
return Err(format!("`self` parameter cannot take default value at {}", x.location));
return Err(format!("`self` parameter cannot take default value (at {})", x.location));
}
Some({
let v = Self::parse_parameter_default_value(default, class_resolver)?;
@ -1090,7 +1132,7 @@ impl TopLevelComposer {
};
class_fields_def.push((*attr, dummy_field_type, mutable));
let annotation = parse_ast_to_type_annotation_kinds(
let parsed_annotation = parse_ast_to_type_annotation_kinds(
class_resolver,
temp_def_list,
unifier,
@ -1100,30 +1142,42 @@ impl TopLevelComposer {
)?;
// find type vars within this return type annotation
let type_vars_within =
get_type_var_contained_in_type_annotation(&annotation);
get_type_var_contained_in_type_annotation(&parsed_annotation);
// handle the class type var and the method type var
for type_var_within in type_vars_within {
if let TypeAnnotation::TypeVar(t) = type_var_within {
if !class_type_vars_def.contains(&t) {
return Err("class fields can only use type \
vars declared as class generic type vars"
.into());
return Err(format!(
"class fields can only use type \
vars declared as class generic type vars (at {})",
annotation.location
));
}
} else {
unreachable!("must be type var annotation");
}
}
type_var_to_concrete_def.insert(dummy_field_type, annotation);
type_var_to_concrete_def.insert(dummy_field_type, parsed_annotation);
} else {
return Err("same class fields defined twice".into());
return Err(format!(
"same class fields `{}` defined twice (at {})",
attr,
target.location
));
}
} else {
return Err("unsupported statement type in class definition body".into());
return Err(format!(
"unsupported statement type in class definition body (at {})",
target.location
));
}
}
ast::StmtKind::Pass { .. } => {}
ast::StmtKind::Expr { value: _, .. } => {} // typically a docstring; ignoring all expressions matches CPython behavior
_ => return Err("unsupported statement type in class definition body".into()),
_ => return Err(format!(
"unsupported statement in class definition body (at {})",
b.location
)),
}
}
Ok(())
@ -1186,7 +1240,10 @@ impl TopLevelComposer {
type_var_to_concrete_def,
);
if !ok {
return Err("method has same name as ancestors' method, but incompatible type".into());
return Err(format!(
"method {} has same name as ancestors' method, but incompatible type",
class_method_name
));
}
// mark it as added
is_override.insert(*class_method_name);
@ -1308,9 +1365,10 @@ impl TopLevelComposer {
for (f, _, _) in fields {
if !all_inited.contains(f) {
return Err(format!(
"fields `{}` of class `{}` not fully initialized",
"fields `{}` of class `{}` not fully initialized in the initializer (at {})",
f,
class_name
class_name,
body[0].location,
));
}
}

10
nac3core/src/toplevel/test.rs
View File

@ -333,7 +333,7 @@ fn test_simple_function_analyze(source: Vec<&str>, tys: Vec<&str>, names: Vec<&s
pass
"}
],
vec!["application of type vars to generic class is not currently supported"];
vec!["application of type vars to generic class is not currently supported (at line 4 column 24)"];
"err no type var in generic app"
)]
#[test_case(
@ -389,7 +389,7 @@ fn test_simple_function_analyze(source: Vec<&str>, tys: Vec<&str>, names: Vec<&s
def __init__():
pass
"}],
vec!["__init__ function must have a `self` parameter"];
vec!["__init__ method must have a `self` parameter (at line 2 column 5)"];
"err no self_1"
)]
#[test_case(
@ -411,7 +411,7 @@ fn test_simple_function_analyze(source: Vec<&str>, tys: Vec<&str>, names: Vec<&s
"}
],
vec!["a class def can only have at most one base class declaration and one generic declaration"];
vec!["a class definition can only have at most one base class declaration and one generic declaration (at line 1 column 24)"];
"err multiple inheritance"
)]
#[test_case(
@ -436,7 +436,7 @@ fn test_simple_function_analyze(source: Vec<&str>, tys: Vec<&str>, names: Vec<&s
pass
"}
],
vec!["method has same name as ancestors' method, but incompatible type"];
vec!["method fun has same name as ancestors' method, but incompatible type"];
"err_incompatible_inheritance_method"
)]
#[test_case(
@ -479,7 +479,7 @@ fn test_simple_function_analyze(source: Vec<&str>, tys: Vec<&str>, names: Vec<&s
pass
"}
],
vec!["duplicate definition of class"];
vec!["duplicate definition of class `A` ( at line 1 column 1)"];
"class same name"
)]
fn test_analyze(source: Vec<&str>, res: Vec<&str>) {

49
nac3core/src/toplevel/type_annotation.rs
View File

@ -70,7 +70,10 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
if let TopLevelDef::Class { type_vars, .. } = &*def_read {
type_vars.clone()
} else {
return Err("function cannot be used as a type".into());
return Err(format!(
"function cannot be used as a type (at {})",
expr.location
));
}
} else {
locked.get(&obj_id).unwrap().clone()
@ -79,8 +82,9 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
// check param number here
if !type_vars.is_empty() {
return Err(format!(
"expect {} type variable parameter but got 0",
type_vars.len()
"expect {} type variable parameter but got 0 (at {})",
type_vars.len(),
expr.location,
));
}
Ok(TypeAnnotation::CustomClass { id: obj_id, params: vec![] })
@ -88,10 +92,13 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
if let TypeEnum::TVar { .. } = unifier.get_ty(ty).as_ref() {
Ok(TypeAnnotation::TypeVar(ty))
} else {
Err("not a type variable identifier".into())
Err(format!(
"not a type variable identifier at {}",
expr.location
))
}
} else {
Err("name cannot be parsed as a type annotation".into())
Err(format!("name cannot be parsed as a type annotation at {}", expr.location))
}
};
@ -100,7 +107,7 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
if vec!["virtual".into(), "Generic".into(), "list".into(), "tuple".into()]
.contains(id)
{
return Err("keywords cannot be class name".into());
return Err(format!("keywords cannot be class name (at {})", expr.location));
}
let obj_id = resolver
.get_identifier_def(*id)
@ -126,13 +133,14 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
};
if type_vars.len() != params_ast.len() {
return Err(format!(
"expect {} type parameters but got {}",
"expect {} type parameters but got {} (at {})",
type_vars.len(),
params_ast.len()
params_ast.len(),
params_ast[0].location,
));
}
let result = params_ast
.into_iter()
.iter()
.map(|x| {
parse_ast_to_type_annotation_kinds(
resolver,
@ -154,9 +162,11 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
if no_type_var {
result
} else {
return Err("application of type vars to generic class \
is not currently supported"
.into());
return Err(format!(
"application of type vars to generic class \
is not currently supported (at {})",
params_ast[0].location
));
}
};
Ok(TypeAnnotation::CustomClass { id: obj_id, params: param_type_infos })
@ -206,8 +216,14 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
matches!(&value.node, ast::ExprKind::Name { id, .. } if id == &"tuple".into())
} =>
{
let tup_elts = {
if let ast::ExprKind::Tuple { elts, .. } = &slice.node {
let type_annotations = elts
elts.as_slice()
} else {
std::slice::from_ref(slice.as_ref())
}
};
let type_annotations = tup_elts
.iter()
.map(|e| {
parse_ast_to_type_annotation_kinds(
@ -221,9 +237,6 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
})
.collect::<Result<Vec<_>, _>>()?;
Ok(TypeAnnotation::Tuple(type_annotations))
} else {
Err("Expect multiple elements for tuple".into())
}
}
// custom class
@ -231,11 +244,11 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
if let ast::ExprKind::Name { id, .. } = &value.node {
class_name_handle(id, slice, unifier, locked)
} else {
Err("unsupported expression type for class name".into())
Err(format!("unsupported expression type for class name at {}", value.location))
}
}
_ => Err("unsupported expression for type annotation".into()),
_ => Err(format!("unsupported expression for type annotation at {}", expr.location)),
}
}