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use std::sync::Arc;
use hir_expand::name::{self, AsName, Name};
use ra_syntax::ast::{self, NameOwner, TypeAscriptionOwner};
use crate::{
db::DefDatabase2,
type_ref::{Mutability, TypeRef},
FunctionId, HasSource, Lookup,
};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct FunctionData {
pub name: Name,
pub params: Vec<TypeRef>,
pub ret_type: TypeRef,
/// True if the first param is `self`. This is relevant to decide whether this
/// can be called as a method.
pub has_self_param: bool,
}
impl FunctionData {
pub(crate) fn fn_data_query(db: &impl DefDatabase2, func: FunctionId) -> Arc<FunctionData> {
let src = func.lookup(db).source(db);
let name = src.value.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) = src.value.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.kind() {
ast::SelfParamKind::Owned => self_type,
ast::SelfParamKind::Ref => {
TypeRef::Reference(Box::new(self_type), Mutability::Shared)
}
ast::SelfParamKind::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) = src.value.ret_type().and_then(|rt| rt.type_ref()) {
TypeRef::from_ast(type_ref)
} else {
TypeRef::unit()
};
let sig = FunctionData { name, params, ret_type, has_self_param };
Arc::new(sig)
}
}
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