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//! Functions that are used to classify an element from its definition or reference.
use hir::{Local, PathResolution, Semantics};
use ra_ide_db::defs::NameDefinition;
use ra_ide_db::RootDatabase;
use ra_prof::profile;
use ra_syntax::{ast, AstNode};
use test_utils::tested_by;
pub enum NameRefClass {
NameDefinition(NameDefinition),
FieldShorthand { local: Local, field: NameDefinition },
}
impl NameRefClass {
pub fn definition(self) -> NameDefinition {
match self {
NameRefClass::NameDefinition(def) => def,
NameRefClass::FieldShorthand { local, field: _ } => NameDefinition::Local(local),
}
}
}
pub(crate) fn classify_name_ref(
sema: &Semantics<RootDatabase>,
name_ref: &ast::NameRef,
) -> Option<NameRefClass> {
let _p = profile("classify_name_ref");
let parent = name_ref.syntax().parent()?;
if let Some(method_call) = ast::MethodCallExpr::cast(parent.clone()) {
tested_by!(goto_def_for_methods);
if let Some(func) = sema.resolve_method_call(&method_call) {
return Some(NameRefClass::NameDefinition(NameDefinition::ModuleDef(func.into())));
}
}
if let Some(field_expr) = ast::FieldExpr::cast(parent.clone()) {
tested_by!(goto_def_for_fields);
if let Some(field) = sema.resolve_field(&field_expr) {
return Some(NameRefClass::NameDefinition(NameDefinition::StructField(field)));
}
}
if let Some(record_field) = ast::RecordField::cast(parent.clone()) {
tested_by!(goto_def_for_record_fields);
tested_by!(goto_def_for_field_init_shorthand);
if let Some((field, local)) = sema.resolve_record_field(&record_field) {
let field = NameDefinition::StructField(field);
let res = match local {
None => NameRefClass::NameDefinition(field),
Some(local) => NameRefClass::FieldShorthand { field, local },
};
return Some(res);
}
}
if let Some(macro_call) = parent.ancestors().find_map(ast::MacroCall::cast) {
tested_by!(goto_def_for_macros);
if let Some(macro_def) = sema.resolve_macro_call(¯o_call) {
return Some(NameRefClass::NameDefinition(NameDefinition::Macro(macro_def)));
}
}
let path = name_ref.syntax().ancestors().find_map(ast::Path::cast)?;
let resolved = sema.resolve_path(&path)?;
let res = match resolved {
PathResolution::Def(def) => NameDefinition::ModuleDef(def),
PathResolution::AssocItem(item) => {
let def = match item {
hir::AssocItem::Function(it) => it.into(),
hir::AssocItem::Const(it) => it.into(),
hir::AssocItem::TypeAlias(it) => it.into(),
};
NameDefinition::ModuleDef(def)
}
PathResolution::Local(local) => NameDefinition::Local(local),
PathResolution::TypeParam(par) => NameDefinition::TypeParam(par),
PathResolution::Macro(def) => NameDefinition::Macro(def),
PathResolution::SelfType(impl_def) => NameDefinition::SelfType(impl_def),
};
Some(NameRefClass::NameDefinition(res))
}
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