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Cleanup signature help a bit

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This commit is contained in:
Lukas Wirth 2023-02-13 11:25:45 +01:00
parent 9738f97f8c
commit 244a48d13d
2 changed files with 79 additions and 65 deletions
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63
crates/ide-db/src/active_parameter.rs
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@ -5,7 +5,7 @@ use hir::{Semantics, Type};
use parser::T;
use syntax::{
ast::{self, HasArgList, HasName},
AstNode, NodeOrToken, SyntaxToken,
match_ast, AstNode, NodeOrToken, SyntaxToken,
};
use crate::RootDatabase;
@ -81,3 +81,64 @@ pub fn callable_for_node(
};
Some((callable, active_param))
}
pub fn generic_def_for_node(
sema: &Semantics<'_, RootDatabase>,
generic_arg_list: &ast::GenericArgList,
token: &SyntaxToken,
) -> Option<(hir::GenericDef, usize, bool)> {
let parent = generic_arg_list.syntax().parent()?;
let def = match_ast! {
match parent {
ast::PathSegment(ps) => {
let res = sema.resolve_path(&ps.parent_path())?;
let generic_def: hir::GenericDef = match res {
hir::PathResolution::Def(hir::ModuleDef::Adt(it)) => it.into(),
hir::PathResolution::Def(hir::ModuleDef::Function(it)) => it.into(),
hir::PathResolution::Def(hir::ModuleDef::Trait(it)) => it.into(),
hir::PathResolution::Def(hir::ModuleDef::TypeAlias(it)) => it.into(),
hir::PathResolution::Def(hir::ModuleDef::Variant(it)) => it.into(),
hir::PathResolution::Def(hir::ModuleDef::BuiltinType(_))
| hir::PathResolution::Def(hir::ModuleDef::Const(_))
| hir::PathResolution::Def(hir::ModuleDef::Macro(_))
| hir::PathResolution::Def(hir::ModuleDef::Module(_))
| hir::PathResolution::Def(hir::ModuleDef::Static(_)) => return None,
hir::PathResolution::BuiltinAttr(_)
| hir::PathResolution::ToolModule(_)
| hir::PathResolution::Local(_)
| hir::PathResolution::TypeParam(_)
| hir::PathResolution::ConstParam(_)
| hir::PathResolution::SelfType(_)
| hir::PathResolution::DeriveHelper(_) => return None,
};
generic_def
},
ast::AssocTypeArg(_) => {
// FIXME: We don't record the resolutions for this anywhere atm
return None;
},
ast::MethodCallExpr(mcall) => {
// recv.method::<$0>()
let method = sema.resolve_method_call(&mcall)?;
method.into()
},
_ => return None,
}
};
let active_param = generic_arg_list
.syntax()
.children_with_tokens()
.filter_map(NodeOrToken::into_token)
.filter(|t| t.kind() == T![,])
.take_while(|t| t.text_range().start() <= token.text_range().start())
.count();
let first_arg_is_non_lifetime = generic_arg_list
.generic_args()
.next()
.map_or(false, |arg| !matches!(arg, ast::GenericArg::LifetimeArg(_)));
Some((def, active_param, first_arg_is_non_lifetime))
}