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use std::sync::Arc;
use ra_syntax::ast::{self, NameOwner, TypeAscriptionOwner};
use crate::{
Name, AsName, Function, FnSignature,
type_ref::{TypeRef, Mutability},
PersistentHirDatabase,
};
impl FnSignature {
pub(crate) fn fn_signature_query(
db: &impl PersistentHirDatabase,
func: Function,
) -> Arc<FnSignature> {
let (_, node) = func.source(db);
let name = node.name().map(|n| n.as_name()).unwrap_or_else(Name::missing);
let mut params = Vec::new();
let mut has_self_param = false;
if let Some(param_list) = node.param_list() {
if let Some(self_param) = param_list.self_param() {
let self_type = if let Some(type_ref) = self_param.ascribed_type() {
TypeRef::from_ast(type_ref)
} else {
let self_type = TypeRef::Path(Name::self_type().into());
match self_param.flavor() {
ast::SelfParamFlavor::Owned => self_type,
ast::SelfParamFlavor::Ref => {
TypeRef::Reference(Box::new(self_type), Mutability::Shared)
}
ast::SelfParamFlavor::MutRef => {
TypeRef::Reference(Box::new(self_type), Mutability::Mut)
}
}
};
params.push(self_type);
has_self_param = true;
}
for param in param_list.params() {
let type_ref = TypeRef::from_ast_opt(param.ascribed_type());
params.push(type_ref);
}
}
let ret_type = if let Some(type_ref) = node.ret_type().and_then(|rt| rt.type_ref()) {
TypeRef::from_ast(type_ref)
} else {
TypeRef::unit()
};
let sig = FnSignature { name, params, ret_type, has_self_param };
Arc::new(sig)
}
}
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