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 { 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) } }