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//! A higher level attributes based on TokenTree, with also some shortcuts.
use std::{ops, sync::Arc};
use either::Either;
use hir_expand::{hygiene::Hygiene, AstId, InFile};
use mbe::ast_to_token_tree;
use ra_syntax::{
ast::{self, AstNode, AttrsOwner},
SmolStr,
};
use tt::Subtree;
use crate::{
db::DefDatabase, path::ModPath, src::HasChildSource, src::HasSource, AdtId, AttrDefId, 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.local_id].declaration_source(db) {
Some(it) => it,
None => return Attrs::default(),
};
Attrs::from_attrs_owner(db, src.as_ref().map(|it| it as &dyn AttrsOwner))
}
AttrDefId::StructFieldId(it) => {
let src = it.parent.child_source(db);
match &src.value[it.local_id] {
Either::Left(_tuple) => Attrs::default(),
Either::Right(record) => Attrs::from_attrs_owner(db, src.with_value(record)),
}
}
AttrDefId::EnumVariantId(var_id) => {
let src = var_id.parent.child_source(db);
let src = src.as_ref().map(|it| &it[var_id.local_id]);
Attrs::from_attrs_owner(db, src.map(|it| it as &dyn AttrsOwner))
}
AttrDefId::AdtId(it) => match it {
AdtId::StructId(it) => attrs_from_loc(it.lookup(db), db),
AdtId::EnumId(it) => attrs_from_loc(it.lookup(db), db),
AdtId::UnionId(it) => attrs_from_loc(it.lookup(db), db),
},
AttrDefId::TraitId(it) => attrs_from_loc(it.lookup(db), db),
AttrDefId::MacroDefId(it) => {
it.ast_id.map_or_else(Default::default, |ast_id| attrs_from_ast(ast_id, db))
}
AttrDefId::ImplId(it) => attrs_from_loc(it.lookup(db), db),
AttrDefId::ConstId(it) => attrs_from_loc(it.lookup(db), db),
AttrDefId::StaticId(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),
}
}
fn from_attrs_owner(db: &impl DefDatabase, owner: InFile<&dyn AttrsOwner>) -> Attrs {
let hygiene = Hygiene::new(db, owner.file_id);
Attrs::new(owner.value, &hygiene)
}
pub(crate) fn new(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 by_key(&self, key: &'static str) -> AttrQuery<'_> {
AttrQuery { attrs: self, key }
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Attr {
pub(crate) path: ModPath,
pub(crate) input: Option<AttrInput>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AttrInput {
Literal(SmolStr),
TokenTree(Subtree),
}
impl Attr {
fn from_src(ast: ast::Attr, hygiene: &Hygiene) -> Option<Attr> {
let path = ModPath::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 struct AttrQuery<'a> {
attrs: &'a Attrs,
key: &'static str,
}
impl<'a> AttrQuery<'a> {
pub fn tt_values(self) -> impl Iterator<Item = &'a Subtree> {
self.attrs().filter_map(|attr| match attr.input.as_ref()? {
AttrInput::TokenTree(it) => Some(it),
_ => None,
})
}
pub fn string_value(self) -> Option<&'a SmolStr> {
self.attrs().find_map(|attr| match attr.input.as_ref()? {
AttrInput::Literal(it) => Some(it),
_ => None,
})
}
pub fn exists(self) -> bool {
self.attrs().next().is_some()
}
fn attrs(self) -> impl Iterator<Item = &'a Attr> {
let key = self.key;
self.attrs
.iter()
.filter(move |attr| attr.path.as_ident().map_or(false, |s| s.to_string() == key))
}
}
fn attrs_from_ast<D, N>(src: AstId<N>, db: &D) -> Attrs
where
N: ast::AttrsOwner,
D: DefDatabase,
{
let src = InFile::new(src.file_id, src.to_node(db));
Attrs::from_attrs_owner(db, src.as_ref().map(|it| it as &dyn AttrsOwner))
}
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);
Attrs::from_attrs_owner(db, src.as_ref().map(|it| it as &dyn AttrsOwner))
}
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