2021-04-08 09:20:14 -05:00
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use std::iter;
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2020-02-18 11:35:10 -06:00
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use hir::Semantics;
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2021-06-22 10:28:07 -05:00
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use ide_db::{helpers::pick_best_token, RootDatabase};
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2021-08-24 09:33:52 -05:00
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use itertools::Itertools;
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2021-08-25 19:36:33 -05:00
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use syntax::{ast, ted, AstNode, NodeOrToken, SyntaxKind, SyntaxNode, WalkEvent, T};
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2020-02-06 05:52:32 -06:00
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use crate::FilePosition;
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2019-11-17 12:47:50 -06:00
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2019-11-19 08:56:48 -06:00
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pub struct ExpandedMacro {
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pub name: String,
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pub expansion: String,
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}
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2020-05-31 03:14:36 -05:00
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// Feature: Expand Macro Recursively
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//
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// Shows the full macro expansion of the macro at current cursor.
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//
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// |===
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// | Editor | Action Name
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//
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// | VS Code | **Rust Analyzer: Expand macro recursively**
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// |===
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2021-03-30 18:08:10 -05:00
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//
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// image::https://user-images.githubusercontent.com/48062697/113020648-b3973180-917a-11eb-84a9-ecb921293dc5.gif[]
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2019-11-19 08:56:48 -06:00
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pub(crate) fn expand_macro(db: &RootDatabase, position: FilePosition) -> Option<ExpandedMacro> {
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2020-02-18 11:35:10 -06:00
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let sema = Semantics::new(db);
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let file = sema.parse(position.file_id);
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2019-11-17 12:47:50 -06:00
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2021-06-22 10:28:07 -05:00
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let tok = pick_best_token(file.syntax().token_at_offset(position.offset), |kind| match kind {
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SyntaxKind::IDENT => 1,
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_ => 0,
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})?;
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2021-09-13 20:00:53 -05:00
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2021-10-26 13:09:14 -05:00
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// due to how Rust Analyzer works internally, we need to special case derive attributes,
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2021-10-26 13:10:09 -05:00
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// otherwise they might not get found, e.g. here with the cursor at $0 `#[attr]` would expand:
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2021-10-26 13:09:14 -05:00
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// ```
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// #[attr]
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// #[derive($0Foo)]
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// struct Bar;
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// ```
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let derive = sema.descend_into_macros(tok.clone()).iter().find_map(|descended| {
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let attr = descended.ancestors().find_map(ast::Attr::cast)?;
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let (path, tt) = attr.as_simple_call()?;
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if path == "derive" {
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let mut tt = tt.syntax().children_with_tokens().skip(1).join("");
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tt.pop();
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let expansions = sema.expand_derive_macro(&attr)?;
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2021-10-26 13:17:47 -05:00
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Some(ExpandedMacro {
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2021-10-26 13:09:14 -05:00
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name: tt,
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expansion: expansions.into_iter().map(insert_whitespaces).join(""),
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2021-10-26 13:17:47 -05:00
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})
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2021-10-26 13:09:14 -05:00
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} else {
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None
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2021-08-25 19:36:33 -05:00
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}
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2021-10-26 13:09:14 -05:00
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});
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if derive.is_some() {
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return derive;
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2021-08-25 19:36:33 -05:00
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}
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2021-09-13 20:00:53 -05:00
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// FIXME: Intermix attribute and bang! expansions
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// currently we only recursively expand one of the two types
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2021-06-07 09:05:36 -05:00
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let mut expanded = None;
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let mut name = None;
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for node in tok.ancestors() {
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2021-06-08 15:13:22 -05:00
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if let Some(item) = ast::Item::cast(node.clone()) {
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2021-08-21 16:24:12 -05:00
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if let Some(def) = sema.resolve_attr_macro_call(&item) {
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name = def.name(db).map(|name| name.to_string());
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expanded = expand_attr_macro_recur(&sema, &item);
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2021-06-08 15:13:22 -05:00
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break;
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2021-06-07 09:05:36 -05:00
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}
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}
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2021-06-08 15:13:22 -05:00
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if let Some(mac) = ast::MacroCall::cast(node) {
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name = Some(mac.path()?.segment()?.name_ref()?.to_string());
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expanded = expand_macro_recur(&sema, &mac);
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break;
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}
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2021-06-07 09:05:36 -05:00
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}
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2019-11-17 12:47:50 -06:00
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2019-11-19 08:56:28 -06:00
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// FIXME:
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// macro expansion may lose all white space information
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// But we hope someday we can use ra_fmt for that
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2021-06-07 09:05:36 -05:00
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let expansion = insert_whitespaces(expanded?);
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2021-08-21 16:24:12 -05:00
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Some(ExpandedMacro { name: name.unwrap_or_else(|| "???".to_owned()), expansion })
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2019-11-17 12:47:50 -06:00
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}
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fn expand_macro_recur(
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2020-02-18 11:35:10 -06:00
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sema: &Semantics<RootDatabase>,
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macro_call: &ast::MacroCall,
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2019-11-17 12:47:50 -06:00
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) -> Option<SyntaxNode> {
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2021-04-19 12:43:26 -05:00
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let expanded = sema.expand(macro_call)?.clone_for_update();
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2021-08-21 16:24:12 -05:00
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expand(sema, expanded, ast::MacroCall::cast, expand_macro_recur)
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}
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fn expand_attr_macro_recur(sema: &Semantics<RootDatabase>, item: &ast::Item) -> Option<SyntaxNode> {
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let expanded = sema.expand_attr_macro(item)?.clone_for_update();
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expand(sema, expanded, ast::Item::cast, expand_attr_macro_recur)
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}
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2019-11-17 12:47:50 -06:00
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2021-08-21 16:24:12 -05:00
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fn expand<T: AstNode>(
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sema: &Semantics<RootDatabase>,
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expanded: SyntaxNode,
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f: impl FnMut(SyntaxNode) -> Option<T>,
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exp: impl Fn(&Semantics<RootDatabase>, &T) -> Option<SyntaxNode>,
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) -> Option<SyntaxNode> {
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let children = expanded.descendants().filter_map(f);
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2021-04-19 12:43:26 -05:00
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let mut replacements = Vec::new();
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2019-11-17 12:47:50 -06:00
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2021-04-19 12:43:26 -05:00
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for child in children {
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2021-08-21 16:24:12 -05:00
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if let Some(new_node) = exp(sema, &child) {
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2021-04-19 12:43:26 -05:00
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// check if the whole original syntax is replaced
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2019-11-22 20:33:14 -06:00
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if expanded == *child.syntax() {
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2021-04-19 12:43:26 -05:00
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return Some(new_node);
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2019-11-22 20:33:14 -06:00
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}
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2021-04-19 12:43:26 -05:00
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replacements.push((child, new_node));
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2019-11-21 22:04:20 -06:00
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}
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2019-11-17 12:47:50 -06:00
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}
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2021-04-19 12:43:26 -05:00
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replacements.into_iter().rev().for_each(|(old, new)| ted::replace(old.syntax(), new));
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Some(expanded)
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2019-11-17 12:47:50 -06:00
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}
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2019-11-19 10:12:48 -06:00
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// FIXME: It would also be cool to share logic here and in the mbe tests,
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// which are pretty unreadable at the moment.
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2019-11-19 08:56:28 -06:00
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fn insert_whitespaces(syn: SyntaxNode) -> String {
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2021-08-25 19:36:33 -05:00
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use SyntaxKind::*;
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2019-11-19 10:12:48 -06:00
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let mut res = String::new();
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2019-11-17 12:47:50 -06:00
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2019-11-19 10:12:48 -06:00
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let mut indent = 0;
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let mut last: Option<SyntaxKind> = None;
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2021-08-25 19:36:33 -05:00
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for event in syn.preorder_with_tokens() {
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let token = match event {
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WalkEvent::Enter(NodeOrToken::Token(token)) => token,
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WalkEvent::Leave(NodeOrToken::Node(node))
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if matches!(node.kind(), ATTR | MATCH_ARM | STRUCT | ENUM | UNION | FN | IMPL) =>
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{
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res.push('\n');
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res.extend(iter::repeat(" ").take(2 * indent));
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continue;
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}
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_ => continue,
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};
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let is_next = |f: fn(SyntaxKind) -> bool, default| -> bool {
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token.next_token().map(|it| f(it.kind())).unwrap_or(default)
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2019-11-19 10:12:48 -06:00
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};
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2019-12-20 14:14:30 -06:00
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let is_last =
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|f: fn(SyntaxKind) -> bool, default| -> bool { last.map(f).unwrap_or(default) };
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2019-11-19 10:12:48 -06:00
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2021-04-08 09:20:14 -05:00
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match token.kind() {
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k if is_text(k) && is_next(|it| !it.is_punct(), true) => {
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res.push_str(token.text());
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res.push(' ');
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}
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2019-11-19 10:12:48 -06:00
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L_CURLY if is_next(|it| it != R_CURLY, true) => {
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indent += 1;
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2021-04-08 09:20:14 -05:00
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if is_last(is_text, false) {
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res.push(' ');
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}
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res.push_str("{\n");
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res.extend(iter::repeat(" ").take(2 * indent));
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2019-11-19 10:12:48 -06:00
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}
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R_CURLY if is_last(|it| it != L_CURLY, true) => {
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2019-12-20 14:14:30 -06:00
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indent = indent.saturating_sub(1);
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2021-04-08 09:20:14 -05:00
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res.push('\n');
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res.extend(iter::repeat(" ").take(2 * indent));
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res.push_str("}");
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}
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R_CURLY => {
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res.push_str("}\n");
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res.extend(iter::repeat(" ").take(2 * indent));
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2019-11-19 10:12:48 -06:00
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}
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2021-10-01 14:29:26 -05:00
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LIFETIME_IDENT if is_next(|it| it == IDENT || it == MUT_KW, true) => {
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2021-04-08 09:20:14 -05:00
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res.push_str(token.text());
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res.push(' ');
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2021-04-06 22:22:44 -05:00
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}
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2021-04-08 09:20:14 -05:00
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T![;] => {
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res.push_str(";\n");
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res.extend(iter::repeat(" ").take(2 * indent));
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}
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T![->] => res.push_str(" -> "),
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T![=] => res.push_str(" = "),
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T![=>] => res.push_str(" => "),
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_ => res.push_str(token.text()),
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}
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2019-11-19 10:12:48 -06:00
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last = Some(token.kind());
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2019-11-19 08:56:28 -06:00
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}
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2019-11-17 12:47:50 -06:00
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2019-11-21 12:35:49 -06:00
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return res;
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fn is_text(k: SyntaxKind) -> bool {
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k.is_keyword() || k.is_literal() || k == IDENT
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}
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2019-11-17 12:47:50 -06:00
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}
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#[cfg(test)]
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mod tests {
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2020-08-21 06:19:31 -05:00
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use expect_test::{expect, Expect};
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2019-11-17 12:47:50 -06:00
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2020-10-02 10:34:31 -05:00
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use crate::fixture;
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2020-02-18 11:35:10 -06:00
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2021-08-25 19:36:33 -05:00
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#[track_caller]
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2020-07-01 10:52:22 -05:00
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fn check(ra_fixture: &str, expect: Expect) {
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2020-10-02 10:34:31 -05:00
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let (analysis, pos) = fixture::position(ra_fixture);
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2020-07-01 10:52:22 -05:00
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let expansion = analysis.expand_macro(pos).unwrap().unwrap();
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let actual = format!("{}\n{}", expansion.name, expansion.expansion);
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expect.assert_eq(&actual);
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2019-11-17 12:47:50 -06:00
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}
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#[test]
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fn macro_expand_recursive_expansion() {
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2020-07-01 10:52:22 -05:00
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check(
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2019-11-17 12:47:50 -06:00
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r#"
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2020-07-01 10:52:22 -05:00
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macro_rules! bar {
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() => { fn b() {} }
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}
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macro_rules! foo {
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() => { bar!(); }
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}
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macro_rules! baz {
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() => { foo!(); }
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}
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2021-01-06 14:15:48 -06:00
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f$0oo!();
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2020-07-01 10:52:22 -05:00
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"#,
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expect![[r#"
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foo
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fn b(){}
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2021-08-25 19:36:33 -05:00
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2020-07-01 10:52:22 -05:00
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"#]],
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2019-11-17 12:47:50 -06:00
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);
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2019-11-19 10:12:48 -06:00
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}
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#[test]
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fn macro_expand_multiple_lines() {
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2020-07-01 10:52:22 -05:00
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check(
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2019-11-19 10:12:48 -06:00
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r#"
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2020-07-01 10:52:22 -05:00
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macro_rules! foo {
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() => {
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fn some_thing() -> u32 {
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let a = 0;
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a + 10
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2019-11-19 10:12:48 -06:00
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}
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2020-07-01 10:52:22 -05:00
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}
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}
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2021-01-06 14:15:48 -06:00
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f$0oo!();
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2019-11-19 10:12:48 -06:00
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"#,
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2020-07-01 10:52:22 -05:00
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expect![[r#"
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2021-08-25 19:36:33 -05:00
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foo
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fn some_thing() -> u32 {
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let a = 0;
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a+10
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}
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"#]],
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2019-11-19 10:12:48 -06:00
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);
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2019-11-21 12:35:30 -06:00
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}
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#[test]
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fn macro_expand_match_ast() {
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2020-07-01 10:52:22 -05:00
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check(
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2019-11-21 12:35:30 -06:00
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r#"
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2020-07-01 10:52:22 -05:00
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macro_rules! match_ast {
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(match $node:ident { $($tt:tt)* }) => { match_ast!(match ($node) { $($tt)* }) };
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(match ($node:expr) {
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$( ast::$ast:ident($it:ident) => $res:block, )*
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_ => $catch_all:expr $(,)?
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}) => {{
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$( if let Some($it) = ast::$ast::cast($node.clone()) $res else )*
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{ $catch_all }
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}};
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}
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2020-02-06 05:52:32 -06:00
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2020-07-01 10:52:22 -05:00
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fn main() {
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2021-01-06 14:15:48 -06:00
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mat$0ch_ast! {
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2020-07-01 10:52:22 -05:00
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match container {
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ast::TraitDef(it) => {},
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ast::ImplDef(it) => {},
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_ => { continue },
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2020-02-06 05:52:32 -06:00
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}
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2019-11-21 12:35:30 -06:00
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}
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}
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2020-07-01 10:52:22 -05:00
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"#,
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|
expect![[r#"
|
|
|
|
match_ast
|
|
|
|
{
|
|
|
|
if let Some(it) = ast::TraitDef::cast(container.clone()){}
|
|
|
|
else if let Some(it) = ast::ImplDef::cast(container.clone()){}
|
|
|
|
else {
|
|
|
|
{
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}"#]],
|
|
|
|
);
|
2019-11-17 12:47:50 -06:00
|
|
|
}
|
2019-11-21 22:04:20 -06:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn macro_expand_match_ast_inside_let_statement() {
|
2020-07-01 10:52:22 -05:00
|
|
|
check(
|
2019-11-21 22:04:20 -06:00
|
|
|
r#"
|
2020-07-01 10:52:22 -05:00
|
|
|
macro_rules! match_ast {
|
|
|
|
(match $node:ident { $($tt:tt)* }) => { match_ast!(match ($node) { $($tt)* }) };
|
|
|
|
(match ($node:expr) {}) => {{}};
|
|
|
|
}
|
2019-11-21 22:04:20 -06:00
|
|
|
|
2020-07-01 10:52:22 -05:00
|
|
|
fn main() {
|
|
|
|
let p = f(|it| {
|
2021-01-06 14:15:48 -06:00
|
|
|
let res = mat$0ch_ast! { match c {}};
|
2020-07-01 10:52:22 -05:00
|
|
|
Some(res)
|
|
|
|
})?;
|
|
|
|
}
|
|
|
|
"#,
|
|
|
|
expect![[r#"
|
|
|
|
match_ast
|
|
|
|
{}
|
|
|
|
"#]],
|
2019-11-21 22:04:20 -06:00
|
|
|
);
|
|
|
|
}
|
2019-11-22 20:33:14 -06:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn macro_expand_inner_macro_fail_to_expand() {
|
2020-07-01 10:52:22 -05:00
|
|
|
check(
|
2019-11-22 20:33:14 -06:00
|
|
|
r#"
|
2020-07-01 10:52:22 -05:00
|
|
|
macro_rules! bar {
|
|
|
|
(BAD) => {};
|
|
|
|
}
|
|
|
|
macro_rules! foo {
|
|
|
|
() => {bar!()};
|
|
|
|
}
|
2019-11-22 20:33:14 -06:00
|
|
|
|
2020-07-01 10:52:22 -05:00
|
|
|
fn main() {
|
2021-01-06 14:15:48 -06:00
|
|
|
let res = fo$0o!();
|
2020-07-01 10:52:22 -05:00
|
|
|
}
|
|
|
|
"#,
|
|
|
|
expect![[r#"
|
|
|
|
foo
|
|
|
|
"#]],
|
2019-11-22 20:33:14 -06:00
|
|
|
);
|
|
|
|
}
|
2019-11-26 01:05:53 -06:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn macro_expand_with_dollar_crate() {
|
2020-07-01 10:52:22 -05:00
|
|
|
check(
|
2019-11-26 01:05:53 -06:00
|
|
|
r#"
|
2020-07-01 10:52:22 -05:00
|
|
|
#[macro_export]
|
|
|
|
macro_rules! bar {
|
|
|
|
() => {0};
|
|
|
|
}
|
|
|
|
macro_rules! foo {
|
|
|
|
() => {$crate::bar!()};
|
|
|
|
}
|
2019-11-26 01:05:53 -06:00
|
|
|
|
2020-07-01 10:52:22 -05:00
|
|
|
fn main() {
|
2021-01-06 14:15:48 -06:00
|
|
|
let res = fo$0o!();
|
2020-07-01 10:52:22 -05:00
|
|
|
}
|
|
|
|
"#,
|
|
|
|
expect![[r#"
|
|
|
|
foo
|
|
|
|
0 "#]],
|
2019-11-26 01:05:53 -06:00
|
|
|
);
|
|
|
|
}
|
2021-08-24 09:33:52 -05:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn macro_expand_derive() {
|
|
|
|
check(
|
|
|
|
r#"
|
2021-10-26 13:15:25 -05:00
|
|
|
//- proc_macros: identity
|
2021-11-17 12:46:32 -06:00
|
|
|
//- minicore: clone, derive
|
2021-08-24 09:33:52 -05:00
|
|
|
|
2021-10-26 13:15:25 -05:00
|
|
|
#[proc_macros::identity]
|
2021-08-24 09:33:52 -05:00
|
|
|
#[derive(C$0lone)]
|
|
|
|
struct Foo {}
|
|
|
|
"#,
|
|
|
|
expect![[r#"
|
|
|
|
Clone
|
2021-11-17 12:46:32 -06:00
|
|
|
impl< >core::clone::Clone for Foo< >{}
|
2021-08-25 19:36:33 -05:00
|
|
|
|
|
|
|
"#]],
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn macro_expand_derive2() {
|
|
|
|
check(
|
|
|
|
r#"
|
2021-11-17 12:46:32 -06:00
|
|
|
//- minicore: copy, clone, derive
|
2021-08-25 19:36:33 -05:00
|
|
|
|
|
|
|
#[derive(Cop$0y)]
|
|
|
|
#[derive(Clone)]
|
|
|
|
struct Foo {}
|
|
|
|
"#,
|
|
|
|
expect![[r#"
|
|
|
|
Copy
|
2021-11-17 12:46:32 -06:00
|
|
|
impl< >core::marker::Copy for Foo< >{}
|
2021-08-25 19:36:33 -05:00
|
|
|
|
2021-08-24 09:33:52 -05:00
|
|
|
"#]],
|
|
|
|
);
|
|
|
|
}
|
2021-08-25 20:32:34 -05:00
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn macro_expand_derive_multi() {
|
|
|
|
check(
|
|
|
|
r#"
|
2021-11-17 12:46:32 -06:00
|
|
|
//- minicore: copy, clone, derive
|
2021-08-25 20:32:34 -05:00
|
|
|
|
|
|
|
#[derive(Cop$0y, Clone)]
|
|
|
|
struct Foo {}
|
|
|
|
"#,
|
|
|
|
expect![[r#"
|
|
|
|
Copy, Clone
|
2021-11-17 12:46:32 -06:00
|
|
|
impl< >core::marker::Copy for Foo< >{}
|
2021-08-25 20:32:34 -05:00
|
|
|
|
2021-11-17 12:46:32 -06:00
|
|
|
impl< >core::clone::Clone for Foo< >{}
|
2021-08-25 20:32:34 -05:00
|
|
|
|
|
|
|
"#]],
|
|
|
|
);
|
|
|
|
}
|
2019-11-17 12:47:50 -06:00
|
|
|
}
|