314 lines
10 KiB
Rust
314 lines
10 KiB
Rust
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use std::{fmt, ops, sync::Arc};
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use base_db::CrateId;
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use cfg::CfgExpr;
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use either::Either;
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use intern::Interned;
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use mbe::{syntax_node_to_token_tree, DelimiterKind, Punct};
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use smallvec::{smallvec, SmallVec};
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use syntax::{ast, match_ast, AstNode, SmolStr, SyntaxNode};
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use tt::Subtree;
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use crate::{
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db::AstDatabase,
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hygiene::Hygiene,
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mod_path::{ModPath, PathKind},
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name::AsName,
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InFile,
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};
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/// Syntactical attributes, without filtering of `cfg_attr`s.
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#[derive(Default, Debug, Clone, PartialEq, Eq)]
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pub struct RawAttrs {
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entries: Option<Arc<[Attr]>>,
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}
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impl ops::Deref for RawAttrs {
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type Target = [Attr];
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fn deref(&self) -> &[Attr] {
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match &self.entries {
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Some(it) => &*it,
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None => &[],
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}
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}
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}
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impl RawAttrs {
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pub const EMPTY: Self = Self { entries: None };
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pub fn new(db: &dyn AstDatabase, owner: &dyn ast::HasAttrs, hygiene: &Hygiene) -> Self {
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let entries = collect_attrs(owner)
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.filter_map(|(id, attr)| match attr {
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Either::Left(attr) => {
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attr.meta().and_then(|meta| Attr::from_src(db, meta, hygiene, id))
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}
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Either::Right(comment) => comment.doc_comment().map(|doc| Attr {
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id,
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input: Some(Interned::new(AttrInput::Literal(SmolStr::new(doc)))),
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path: Interned::new(ModPath::from(crate::name!(doc))),
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}),
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})
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.collect::<Arc<_>>();
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Self { entries: if entries.is_empty() { None } else { Some(entries) } }
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}
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pub fn from_attrs_owner(db: &dyn AstDatabase, owner: InFile<&dyn ast::HasAttrs>) -> Self {
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let hygiene = Hygiene::new(db, owner.file_id);
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Self::new(db, owner.value, &hygiene)
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}
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pub fn merge(&self, other: Self) -> Self {
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match (&self.entries, other.entries) {
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(None, None) => Self::EMPTY,
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(None, entries @ Some(_)) => Self { entries },
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(Some(entries), None) => Self { entries: Some(entries.clone()) },
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(Some(a), Some(b)) => {
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let last_ast_index = a.last().map_or(0, |it| it.id.ast_index + 1);
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Self {
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entries: Some(
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a.iter()
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.cloned()
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.chain(b.iter().map(|it| {
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let mut it = it.clone();
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it.id.ast_index += last_ast_index;
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it
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}))
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.collect(),
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),
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}
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}
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}
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}
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/// Processes `cfg_attr`s, returning the resulting semantic `Attrs`.
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pub fn filter(self, db: &dyn AstDatabase, krate: CrateId) -> RawAttrs {
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let has_cfg_attrs = self
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.iter()
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.any(|attr| attr.path.as_ident().map_or(false, |name| *name == crate::name![cfg_attr]));
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if !has_cfg_attrs {
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return self;
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}
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let crate_graph = db.crate_graph();
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let new_attrs = self
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.iter()
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.flat_map(|attr| -> SmallVec<[_; 1]> {
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let is_cfg_attr =
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attr.path.as_ident().map_or(false, |name| *name == crate::name![cfg_attr]);
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if !is_cfg_attr {
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return smallvec![attr.clone()];
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}
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let subtree = match attr.token_tree_value() {
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Some(it) => it,
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_ => return smallvec![attr.clone()],
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};
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// Input subtree is: `(cfg, $(attr),+)`
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// Split it up into a `cfg` subtree and the `attr` subtrees.
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// FIXME: There should be a common API for this.
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let mut parts = subtree.token_trees.split(|tt| {
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matches!(tt, tt::TokenTree::Leaf(tt::Leaf::Punct(Punct { char: ',', .. })))
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});
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let cfg = match parts.next() {
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Some(it) => it,
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None => return smallvec![],
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};
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let cfg = Subtree { delimiter: subtree.delimiter, token_trees: cfg.to_vec() };
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let cfg = CfgExpr::parse(&cfg);
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let index = attr.id;
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let attrs = parts.filter(|a| !a.is_empty()).filter_map(|attr| {
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let tree = Subtree { delimiter: None, token_trees: attr.to_vec() };
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// FIXME hygiene
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let hygiene = Hygiene::new_unhygienic();
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Attr::from_tt(db, &tree, &hygiene, index)
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});
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let cfg_options = &crate_graph[krate].cfg_options;
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if cfg_options.check(&cfg) == Some(false) {
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smallvec![]
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} else {
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cov_mark::hit!(cfg_attr_active);
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attrs.collect()
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}
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})
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.collect();
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RawAttrs { entries: Some(new_attrs) }
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}
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct AttrId {
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pub ast_index: u32,
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct Attr {
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pub id: AttrId,
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pub path: Interned<ModPath>,
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pub input: Option<Interned<AttrInput>>,
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub enum AttrInput {
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/// `#[attr = "string"]`
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Literal(SmolStr),
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/// `#[attr(subtree)]`
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TokenTree(tt::Subtree, mbe::TokenMap),
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}
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impl fmt::Display for AttrInput {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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AttrInput::Literal(lit) => write!(f, " = \"{}\"", lit.escape_debug()),
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AttrInput::TokenTree(subtree, _) => subtree.fmt(f),
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}
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}
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}
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impl Attr {
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fn from_src(
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db: &dyn AstDatabase,
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ast: ast::Meta,
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hygiene: &Hygiene,
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id: AttrId,
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) -> Option<Attr> {
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let path = Interned::new(ModPath::from_src(db, ast.path()?, hygiene)?);
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let input = if let Some(ast::Expr::Literal(lit)) = ast.expr() {
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let value = match lit.kind() {
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ast::LiteralKind::String(string) => string.value()?.into(),
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_ => lit.syntax().first_token()?.text().trim_matches('"').into(),
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};
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Some(Interned::new(AttrInput::Literal(value)))
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} else if let Some(tt) = ast.token_tree() {
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let (tree, map) = syntax_node_to_token_tree(tt.syntax());
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Some(Interned::new(AttrInput::TokenTree(tree, map)))
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} else {
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None
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};
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Some(Attr { id, path, input })
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}
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fn from_tt(
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db: &dyn AstDatabase,
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tt: &tt::Subtree,
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hygiene: &Hygiene,
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id: AttrId,
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) -> Option<Attr> {
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let (parse, _) = mbe::token_tree_to_syntax_node(tt, mbe::TopEntryPoint::MetaItem);
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let ast = ast::Meta::cast(parse.syntax_node())?;
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Self::from_src(db, ast, hygiene, id)
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}
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pub fn path(&self) -> &ModPath {
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&self.path
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}
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}
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impl Attr {
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/// #[path = "string"]
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pub fn string_value(&self) -> Option<&SmolStr> {
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match self.input.as_deref()? {
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AttrInput::Literal(it) => Some(it),
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_ => None,
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}
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}
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/// #[path(ident)]
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pub fn single_ident_value(&self) -> Option<&tt::Ident> {
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match self.input.as_deref()? {
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AttrInput::TokenTree(subtree, _) => match &*subtree.token_trees {
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[tt::TokenTree::Leaf(tt::Leaf::Ident(ident))] => Some(ident),
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_ => None,
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},
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_ => None,
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}
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}
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/// #[path TokenTree]
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pub fn token_tree_value(&self) -> Option<&Subtree> {
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match self.input.as_deref()? {
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AttrInput::TokenTree(subtree, _) => Some(subtree),
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_ => None,
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}
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}
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/// Parses this attribute as a token tree consisting of comma separated paths.
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pub fn parse_path_comma_token_tree(&self) -> Option<impl Iterator<Item = ModPath> + '_> {
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let args = self.token_tree_value()?;
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if args.delimiter_kind() != Some(DelimiterKind::Parenthesis) {
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return None;
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}
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let paths = args
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.token_trees
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.split(|tt| matches!(tt, tt::TokenTree::Leaf(tt::Leaf::Punct(Punct { char: ',', .. }))))
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.filter_map(|tts| {
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if tts.is_empty() {
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return None;
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}
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let segments = tts.iter().filter_map(|tt| match tt {
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tt::TokenTree::Leaf(tt::Leaf::Ident(id)) => Some(id.as_name()),
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_ => None,
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});
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Some(ModPath::from_segments(PathKind::Plain, segments))
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});
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Some(paths)
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}
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}
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pub fn collect_attrs(
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owner: &dyn ast::HasAttrs,
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) -> impl Iterator<Item = (AttrId, Either<ast::Attr, ast::Comment>)> {
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let inner_attrs = inner_attributes(owner.syntax()).into_iter().flatten();
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let outer_attrs =
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ast::AttrDocCommentIter::from_syntax_node(owner.syntax()).filter(|el| match el {
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Either::Left(attr) => attr.kind().is_outer(),
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Either::Right(comment) => comment.is_outer(),
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});
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outer_attrs
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.chain(inner_attrs)
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.enumerate()
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.map(|(id, attr)| (AttrId { ast_index: id as u32 }, attr))
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}
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fn inner_attributes(
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syntax: &SyntaxNode,
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) -> Option<impl Iterator<Item = Either<ast::Attr, ast::Comment>>> {
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let node = match_ast! {
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match syntax {
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ast::SourceFile(_) => syntax.clone(),
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ast::ExternBlock(it) => it.extern_item_list()?.syntax().clone(),
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ast::Fn(it) => it.body()?.stmt_list()?.syntax().clone(),
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ast::Impl(it) => it.assoc_item_list()?.syntax().clone(),
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ast::Module(it) => it.item_list()?.syntax().clone(),
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ast::BlockExpr(it) => {
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use syntax::SyntaxKind::{BLOCK_EXPR , EXPR_STMT};
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// Block expressions accept outer and inner attributes, but only when they are the outer
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// expression of an expression statement or the final expression of another block expression.
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let may_carry_attributes = matches!(
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it.syntax().parent().map(|it| it.kind()),
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Some(BLOCK_EXPR | EXPR_STMT)
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);
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if !may_carry_attributes {
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return None
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}
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syntax.clone()
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},
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_ => return None,
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}
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};
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let attrs = ast::AttrDocCommentIter::from_syntax_node(&node).filter(|el| match el {
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Either::Left(attr) => attr.kind().is_inner(),
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Either::Right(comment) => comment.is_inner(),
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});
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Some(attrs)
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}
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