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//! A higher level attributes based on TokenTree, with also some shortcuts.
use std::{ops, sync::Arc};
use hir_expand::{either::Either, hygiene::Hygiene, AstId};
use mbe::ast_to_token_tree;
use ra_cfg::CfgOptions;
use ra_syntax::{
ast::{self, AstNode, AttrsOwner},
SmolStr,
};
use tt::Subtree;
use crate::{
db::DefDatabase, path::Path, AdtId, AstItemDef, AttrDefId, HasChildSource, HasSource, Lookup,
};
#[derive(Default, Debug, Clone, PartialEq, Eq)]
pub struct Attrs {
entries: Option<Arc<[Attr]>>,
}
impl ops::Deref for Attrs {
type Target = [Attr];
fn deref(&self) -> &[Attr] {
match &self.entries {
Some(it) => &*it,
None => &[],
}
}
}
impl Attrs {
pub(crate) fn attrs_query(db: &impl DefDatabase, def: AttrDefId) -> Attrs {
match def {
AttrDefId::ModuleId(module) => {
let def_map = db.crate_def_map(module.krate);
let src = match def_map[module.module_id].declaration_source(db) {
Some(it) => it,
None => return Attrs::default(),
};
let hygiene = Hygiene::new(db, src.file_id);
Attr::from_attrs_owner(&src.value, &hygiene)
}
AttrDefId::StructFieldId(it) => {
let src = it.parent.child_source(db);
match &src.value[it.local_id] {
Either::A(_tuple) => Attrs::default(),
Either::B(record) => {
let hygiene = Hygiene::new(db, src.file_id);
Attr::from_attrs_owner(record, &hygiene)
}
}
}
AttrDefId::EnumVariantId(it) => {
let src = it.parent.child_source(db);
let hygiene = Hygiene::new(db, src.file_id);
Attr::from_attrs_owner(&src.value[it.local_id], &hygiene)
}
AttrDefId::AdtId(it) => match it {
AdtId::StructId(it) => attrs_from_ast(it.0.lookup_intern(db).ast_id, db),
AdtId::EnumId(it) => attrs_from_ast(it.lookup_intern(db).ast_id, db),
AdtId::UnionId(it) => attrs_from_ast(it.0.lookup_intern(db).ast_id, db),
},
AttrDefId::StaticId(it) => attrs_from_ast(it.lookup_intern(db).ast_id, db),
AttrDefId::TraitId(it) => attrs_from_ast(it.lookup_intern(db).ast_id, db),
AttrDefId::MacroDefId(it) => attrs_from_ast(it.ast_id, db),
AttrDefId::ImplId(it) => attrs_from_ast(it.lookup_intern(db).ast_id, db),
AttrDefId::ConstId(it) => attrs_from_loc(it.lookup(db), db),
AttrDefId::FunctionId(it) => attrs_from_loc(it.lookup(db), db),
AttrDefId::TypeAliasId(it) => attrs_from_loc(it.lookup(db), db),
}
}
pub fn has_atom(&self, atom: &str) -> bool {
self.iter().any(|it| it.is_simple_atom(atom))
}
pub fn find_string_value(&self, key: &str) -> Option<SmolStr> {
self.iter().filter(|attr| attr.is_simple_atom(key)).find_map(|attr| {
match attr.input.as_ref()? {
AttrInput::Literal(it) => Some(it.clone()),
_ => None,
}
})
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Attr {
pub(crate) path: Path,
pub(crate) input: Option<AttrInput>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AttrInput {
Literal(SmolStr),
TokenTree(Subtree),
}
impl Attr {
pub(crate) fn from_src(ast: ast::Attr, hygiene: &Hygiene) -> Option<Attr> {
let path = Path::from_src(ast.path()?, hygiene)?;
let input = match ast.input() {
None => None,
Some(ast::AttrInput::Literal(lit)) => {
// FIXME: escape? raw string?
let value = lit.syntax().first_token()?.text().trim_matches('"').into();
Some(AttrInput::Literal(value))
}
Some(ast::AttrInput::TokenTree(tt)) => {
Some(AttrInput::TokenTree(ast_to_token_tree(&tt)?.0))
}
};
Some(Attr { path, input })
}
pub fn from_attrs_owner(owner: &dyn AttrsOwner, hygiene: &Hygiene) -> Attrs {
let mut attrs = owner.attrs().peekable();
let entries = if attrs.peek().is_none() {
// Avoid heap allocation
None
} else {
Some(attrs.flat_map(|ast| Attr::from_src(ast, hygiene)).collect())
};
Attrs { entries }
}
pub fn is_simple_atom(&self, name: &str) -> bool {
// FIXME: Avoid cloning
self.path.as_ident().map_or(false, |s| s.to_string() == name)
}
// FIXME: handle cfg_attr :-)
pub fn as_cfg(&self) -> Option<&Subtree> {
if !self.is_simple_atom("cfg") {
return None;
}
match &self.input {
Some(AttrInput::TokenTree(subtree)) => Some(subtree),
_ => None,
}
}
pub fn as_path(&self) -> Option<&SmolStr> {
if !self.is_simple_atom("path") {
return None;
}
match &self.input {
Some(AttrInput::Literal(it)) => Some(it),
_ => None,
}
}
pub fn is_cfg_enabled(&self, cfg_options: &CfgOptions) -> Option<bool> {
cfg_options.is_cfg_enabled(self.as_cfg()?)
}
}
fn attrs_from_ast<D, N>(src: AstId<N>, db: &D) -> Attrs
where
N: ast::AttrsOwner,
D: DefDatabase,
{
let hygiene = Hygiene::new(db, src.file_id());
Attr::from_attrs_owner(&src.to_node(db), &hygiene)
}
fn attrs_from_loc<T, D>(node: T, db: &D) -> Attrs
where
T: HasSource,
T::Value: ast::AttrsOwner,
D: DefDatabase,
{
let src = node.source(db);
let hygiene = Hygiene::new(db, src.file_id);
Attr::from_attrs_owner(&src.value, &hygiene)
}
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