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//! A higher level attributes based on TokenTree, with also some shortcuts.
use std::{ops, sync::Arc};
use cfg::{CfgExpr, CfgOptions};
use either::Either;
use hir_expand::{hygiene::Hygiene, AstId, InFile};
use mbe::ast_to_token_tree;
use syntax::{
ast::{self, AstNode, AttrsOwner},
SmolStr,
};
use tt::Subtree;
use crate::{
db::DefDatabase,
item_tree::{ItemTreeId, ItemTreeNode},
nameres::ModuleSource,
path::ModPath,
src::HasChildSource,
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 const EMPTY: Attrs = Attrs { entries: None };
pub(crate) fn attrs_query(db: &dyn DefDatabase, def: AttrDefId) -> Attrs {
match def {
AttrDefId::ModuleId(module) => {
let def_map = db.crate_def_map(module.krate);
let mod_data = &def_map[module.local_id];
match mod_data.declaration_source(db) {
Some(it) => {
Attrs::from_attrs_owner(db, it.as_ref().map(|it| it as &dyn AttrsOwner))
}
None => Attrs::from_attrs_owner(
db,
mod_data.definition_source(db).as_ref().map(|src| match src {
ModuleSource::SourceFile(file) => file as &dyn AttrsOwner,
ModuleSource::Module(module) => module as &dyn AttrsOwner,
}),
),
}
}
AttrDefId::FieldId(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_item_tree(it.lookup(db).id, db),
AdtId::EnumId(it) => attrs_from_item_tree(it.lookup(db).id, db),
AdtId::UnionId(it) => attrs_from_item_tree(it.lookup(db).id, db),
},
AttrDefId::TraitId(it) => attrs_from_item_tree(it.lookup(db).id, 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_item_tree(it.lookup(db).id, db),
AttrDefId::ConstId(it) => attrs_from_item_tree(it.lookup(db).id, db),
AttrDefId::StaticId(it) => attrs_from_item_tree(it.lookup(db).id, db),
AttrDefId::FunctionId(it) => attrs_from_item_tree(it.lookup(db).id, db),
AttrDefId::TypeAliasId(it) => attrs_from_item_tree(it.lookup(db).id, db),
}
}
pub fn from_attrs_owner(db: &dyn DefDatabase, owner: InFile<&dyn AttrsOwner>) -> Attrs {
let hygiene = Hygiene::new(db.upcast(), owner.file_id);
Attrs::new(owner.value, &hygiene)
}
pub(crate) fn new(owner: &dyn AttrsOwner, hygiene: &Hygiene) -> Attrs {
let docs = ast::CommentIter::from_syntax_node(owner.syntax()).doc_comment_text().map(
|docs_text| Attr {
input: Some(AttrInput::Literal(SmolStr::new(docs_text))),
path: ModPath::from(hir_expand::name!(doc)),
},
);
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)).chain(docs).collect())
};
Attrs { entries }
}
pub fn merge(&self, other: Attrs) -> Attrs {
match (&self.entries, &other.entries) {
(None, None) => Attrs { entries: None },
(Some(entries), None) | (None, Some(entries)) => {
Attrs { entries: Some(entries.clone()) }
}
(Some(a), Some(b)) => {
Attrs { entries: Some(a.iter().chain(b.iter()).cloned().collect()) }
}
}
}
pub fn by_key(&self, key: &'static str) -> AttrQuery<'_> {
AttrQuery { attrs: self, key }
}
pub fn cfg(&self) -> impl Iterator<Item = CfgExpr> + '_ {
// FIXME: handle cfg_attr :-)
self.by_key("cfg").tt_values().map(CfgExpr::parse)
}
pub(crate) fn is_cfg_enabled(&self, cfg_options: &CfgOptions) -> bool {
self.cfg().all(|cfg| cfg_options.check(&cfg) != Some(false))
}
}
#[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 {
/// `#[attr = "string"]`
Literal(SmolStr),
/// `#[attr(subtree)]`
TokenTree(Subtree),
}
impl Attr {
fn from_src(ast: ast::Attr, hygiene: &Hygiene) -> Option<Attr> {
let path = ModPath::from_src(ast.path()?, hygiene)?;
let input = if let Some(lit) = ast.literal() {
// FIXME: escape? raw string?
let value = lit.syntax().first_token()?.text().trim_matches('"').into();
Some(AttrInput::Literal(value))
} else if let Some(tt) = ast.token_tree() {
Some(AttrInput::TokenTree(ast_to_token_tree(&tt)?.0))
} else {
None
};
Some(Attr { path, input })
}
}
#[derive(Debug, Clone, Copy)]
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<N>(src: AstId<N>, db: &dyn DefDatabase) -> Attrs
where
N: ast::AttrsOwner,
{
let src = InFile::new(src.file_id, src.to_node(db.upcast()));
Attrs::from_attrs_owner(db, src.as_ref().map(|it| it as &dyn AttrsOwner))
}
fn attrs_from_item_tree<N: ItemTreeNode>(id: ItemTreeId<N>, db: &dyn DefDatabase) -> Attrs {
let tree = db.item_tree(id.file_id);
let mod_item = N::id_to_mod_item(id.value);
tree.attrs(mod_item.into()).clone()
}
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