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//! Functions that are used to classify an element from its definition or reference.
use hir::{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 use ra_ide_db::defs::{from_module_def, from_struct_field};
pub(crate) fn classify_name_ref(
sema: &Semantics<RootDatabase>,
name_ref: &ast::NameRef,
) -> Option<NameDefinition> {
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(from_module_def(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(from_struct_field(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_def) = sema.resolve_record_field(&record_field) {
return Some(from_struct_field(field_def));
}
}
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(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) => from_module_def(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(),
};
from_module_def(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(res)
}
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