//! A module with ide helpers for high-level ide features.
-use crate::RootDatabase;
-use hir::{Crate, Enum, Module, ScopeDef, Semantics, Trait};
-use syntax::ast::{self, make};
-
+pub mod famous_defs;
+pub mod generated_lints;
+pub mod import_assets;
pub mod insert_use;
+pub mod merge_imports;
+pub mod insert_whitespace_into_node;
+pub mod node_ext;
+pub mod rust_doc;
+
+use std::{collections::VecDeque, iter};
+
+use base_db::FileId;
+use hir::{ItemInNs, MacroDef, ModuleDef, Name, PathResolution, Semantics};
+use itertools::Itertools;
+use syntax::{
+ ast::{self, make, HasLoopBody},
+ AstNode, AstToken, Direction, SyntaxElement, SyntaxKind, SyntaxToken, TokenAtOffset, WalkEvent,
+ T,
+};
+
+use crate::{defs::Definition, RootDatabase};
+
+pub use self::famous_defs::FamousDefs;
+
+pub fn item_name(db: &RootDatabase, item: ItemInNs) -> Option<Name> {
+ match item {
+ ItemInNs::Types(module_def_id) => ModuleDef::from(module_def_id).name(db),
+ ItemInNs::Values(module_def_id) => ModuleDef::from(module_def_id).name(db),
+ ItemInNs::Macros(macro_def_id) => MacroDef::from(macro_def_id).name(db),
+ }
+}
+
+/// Parses and returns the derive path at the cursor position in the given attribute, if it is a derive.
+/// This special case is required because the derive macro is a compiler builtin that discards the input derives.
+///
+/// The returned path is synthesized from TokenTree tokens and as such cannot be used with the [`Semantics`].
+pub fn get_path_in_derive_attr(
+ sema: &hir::Semantics<RootDatabase>,
+ attr: &ast::Attr,
+ cursor: &ast::Ident,
+) -> Option<ast::Path> {
+ let path = attr.path()?;
+ let tt = attr.token_tree()?;
+ if !tt.syntax().text_range().contains_range(cursor.syntax().text_range()) {
+ return None;
+ }
+ let scope = sema.scope(attr.syntax());
+ let resolved_attr = sema.resolve_path(&path)?;
+ let derive = FamousDefs(sema, scope.krate()).core_macros_builtin_derive()?;
+ if PathResolution::Macro(derive) != resolved_attr {
+ return None;
+ }
+ get_path_at_cursor_in_tt(cursor)
+}
+
+/// Parses the path the identifier is part of inside a token tree.
+pub fn get_path_at_cursor_in_tt(cursor: &ast::Ident) -> Option<ast::Path> {
+ let cursor = cursor.syntax();
+ let first = cursor
+ .siblings_with_tokens(Direction::Prev)
+ .filter_map(SyntaxElement::into_token)
+ .take_while(|tok| tok.kind() != T!['('] && tok.kind() != T![,])
+ .last()?;
+ let path_tokens = first
+ .siblings_with_tokens(Direction::Next)
+ .filter_map(SyntaxElement::into_token)
+ .take_while(|tok| tok != cursor);
+
+ syntax::hacks::parse_expr_from_str(&path_tokens.chain(iter::once(cursor.clone())).join(""))
+ .and_then(|expr| match expr {
+ ast::Expr::PathExpr(it) => it.path(),
+ _ => None,
+ })
+}
+
+/// Parses and resolves the path at the cursor position in the given attribute, if it is a derive.
+/// This special case is required because the derive macro is a compiler builtin that discards the input derives.
+pub fn try_resolve_derive_input(
+ sema: &hir::Semantics<RootDatabase>,
+ attr: &ast::Attr,
+ cursor: &ast::Ident,
+) -> Option<PathResolution> {
+ let path = get_path_in_derive_attr(sema, attr, cursor)?;
+ let scope = sema.scope(attr.syntax());
+ // FIXME: This double resolve shouldn't be necessary
+ // It's only here so we prefer macros over other namespaces
+ match scope.speculative_resolve_as_mac(&path) {
+ Some(mac) if mac.kind() == hir::MacroKind::Derive => Some(PathResolution::Macro(mac)),
+ Some(_) => return None,
+ None => scope
+ .speculative_resolve(&path)
+ .filter(|res| matches!(res, PathResolution::Def(ModuleDef::Module(_)))),
+ }
+}
+
+/// Picks the token with the highest rank returned by the passed in function.
+pub fn pick_best_token(
+ tokens: TokenAtOffset<SyntaxToken>,
+ f: impl Fn(SyntaxKind) -> usize,
+) -> Option<SyntaxToken> {
+ tokens.max_by_key(move |t| f(t.kind()))
+}
/// Converts the mod path struct into its ast representation.
pub fn mod_path_to_ast(path: &hir::ModPath) -> ast::Path {
}
segments.extend(
- path.segments
+ path.segments()
.iter()
- .map(|segment| make::path_segment(make::name_ref(&segment.to_string()))),
+ .map(|segment| make::path_segment(make::name_ref(&segment.to_smol_str()))),
);
make::path_from_segments(segments, is_abs)
}
-/// Helps with finding well-know things inside the standard library. This is
-/// somewhat similar to the known paths infra inside hir, but it different; We
-/// want to make sure that IDE specific paths don't become interesting inside
-/// the compiler itself as well.
-pub struct FamousDefs<'a, 'b>(pub &'a Semantics<'b, RootDatabase>, pub Option<Crate>);
-
-#[allow(non_snake_case)]
-impl FamousDefs<'_, '_> {
- pub const FIXTURE: &'static str = r#"//- /libcore.rs crate:core
-pub mod convert {
- pub trait From<T> {
- fn from(t: T) -> Self;
+/// Iterates all `ModuleDef`s and `Impl` blocks of the given file.
+pub fn visit_file_defs(
+ sema: &Semantics<RootDatabase>,
+ file_id: FileId,
+ cb: &mut dyn FnMut(Definition),
+) {
+ let db = sema.db;
+ let module = match sema.to_module_def(file_id) {
+ Some(it) => it,
+ None => return,
+ };
+ let mut defs: VecDeque<_> = module.declarations(db).into();
+ while let Some(def) = defs.pop_front() {
+ if let ModuleDef::Module(submodule) = def {
+ if let hir::ModuleSource::Module(_) = submodule.definition_source(db).value {
+ defs.extend(submodule.declarations(db));
+ submodule.impl_defs(db).into_iter().for_each(|impl_| cb(impl_.into()));
+ }
+ }
+ cb(def.into());
}
+ module.impl_defs(db).into_iter().for_each(|impl_| cb(impl_.into()));
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct SnippetCap {
+ _private: (),
}
-pub mod default {
- pub trait Default {
- fn default() -> Self;
+impl SnippetCap {
+ pub const fn new(allow_snippets: bool) -> Option<SnippetCap> {
+ if allow_snippets {
+ Some(SnippetCap { _private: () })
+ } else {
+ None
+ }
}
}
-pub mod iter {
- pub use self::traits::{collect::IntoIterator, iterator::Iterator};
- mod traits {
- pub(crate) mod iterator {
- use crate::option::Option;
- pub trait Iterator {
- type Item;
- fn next(&mut self) -> Option<Self::Item>;
- fn by_ref(&mut self) -> &mut Self {
- self
- }
- fn take(self, n: usize) -> crate::iter::Take<Self> {
- crate::iter::Take { inner: self }
+/// Calls `cb` on each expression inside `expr` that is at "tail position".
+/// Does not walk into `break` or `return` expressions.
+/// Note that modifying the tree while iterating it will cause undefined iteration which might
+/// potentially results in an out of bounds panic.
+pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
+ match expr {
+ ast::Expr::BlockExpr(b) => {
+ match b.modifier() {
+ Some(
+ ast::BlockModifier::Async(_)
+ | ast::BlockModifier::Try(_)
+ | ast::BlockModifier::Const(_),
+ ) => return cb(expr),
+
+ Some(ast::BlockModifier::Label(label)) => {
+ for_each_break_expr(Some(label), b.stmt_list(), &mut |b| {
+ cb(&ast::Expr::BreakExpr(b))
+ });
}
+ Some(ast::BlockModifier::Unsafe(_)) => (),
+ None => (),
}
-
- impl<I: Iterator> Iterator for &mut I {
- type Item = I::Item;
- fn next(&mut self) -> Option<I::Item> {
- (**self).next()
+ if let Some(stmt_list) = b.stmt_list() {
+ if let Some(e) = stmt_list.tail_expr() {
+ for_each_tail_expr(&e, cb);
}
}
}
- pub(crate) mod collect {
- pub trait IntoIterator {
- type Item;
+ ast::Expr::IfExpr(if_) => {
+ let mut if_ = if_.clone();
+ loop {
+ if let Some(block) = if_.then_branch() {
+ for_each_tail_expr(&ast::Expr::BlockExpr(block), cb);
+ }
+ match if_.else_branch() {
+ Some(ast::ElseBranch::IfExpr(it)) => if_ = it,
+ Some(ast::ElseBranch::Block(block)) => {
+ for_each_tail_expr(&ast::Expr::BlockExpr(block), cb);
+ break;
+ }
+ None => break,
+ }
}
}
- }
-
- pub use self::sources::*;
- pub(crate) mod sources {
- use super::Iterator;
- use crate::option::Option::{self, *};
- pub struct Repeat<A> {
- element: A,
- }
-
- pub fn repeat<T>(elt: T) -> Repeat<T> {
- Repeat { element: elt }
+ ast::Expr::LoopExpr(l) => {
+ for_each_break_expr(l.label(), l.loop_body().and_then(|it| it.stmt_list()), &mut |b| {
+ cb(&ast::Expr::BreakExpr(b))
+ })
}
-
- impl<A> Iterator for Repeat<A> {
- type Item = A;
-
- fn next(&mut self) -> Option<A> {
- None
+ ast::Expr::MatchExpr(m) => {
+ if let Some(arms) = m.match_arm_list() {
+ arms.arms().filter_map(|arm| arm.expr()).for_each(|e| for_each_tail_expr(&e, cb));
}
}
+ ast::Expr::ArrayExpr(_)
+ | ast::Expr::AwaitExpr(_)
+ | ast::Expr::BinExpr(_)
+ | ast::Expr::BoxExpr(_)
+ | ast::Expr::BreakExpr(_)
+ | ast::Expr::CallExpr(_)
+ | ast::Expr::CastExpr(_)
+ | ast::Expr::ClosureExpr(_)
+ | ast::Expr::ContinueExpr(_)
+ | ast::Expr::FieldExpr(_)
+ | ast::Expr::ForExpr(_)
+ | ast::Expr::IndexExpr(_)
+ | ast::Expr::Literal(_)
+ | ast::Expr::MacroCall(_)
+ | ast::Expr::MacroStmts(_)
+ | ast::Expr::MethodCallExpr(_)
+ | ast::Expr::ParenExpr(_)
+ | ast::Expr::PathExpr(_)
+ | ast::Expr::PrefixExpr(_)
+ | ast::Expr::RangeExpr(_)
+ | ast::Expr::RecordExpr(_)
+ | ast::Expr::RefExpr(_)
+ | ast::Expr::ReturnExpr(_)
+ | ast::Expr::TryExpr(_)
+ | ast::Expr::TupleExpr(_)
+ | ast::Expr::WhileExpr(_)
+ | ast::Expr::YieldExpr(_) => cb(expr),
}
+}
- pub use self::adapters::*;
- pub(crate) mod adapters {
- use super::Iterator;
- use crate::option::Option::{self, *};
- pub struct Take<I> { pub(crate) inner: I }
- impl<I> Iterator for Take<I> where I: Iterator {
- type Item = <I as Iterator>::Item;
- fn next(&mut self) -> Option<<I as Iterator>::Item> {
- None
+/// Calls `cb` on each break expr inside of `body` that is applicable for the given label.
+pub fn for_each_break_expr(
+ label: Option<ast::Label>,
+ body: Option<ast::StmtList>,
+ cb: &mut dyn FnMut(ast::BreakExpr),
+) {
+ let label = label.and_then(|lbl| lbl.lifetime());
+ let mut depth = 0;
+ if let Some(b) = body {
+ let preorder = &mut b.syntax().preorder();
+ let ev_as_expr = |ev| match ev {
+ WalkEvent::Enter(it) => Some(WalkEvent::Enter(ast::Expr::cast(it)?)),
+ WalkEvent::Leave(it) => Some(WalkEvent::Leave(ast::Expr::cast(it)?)),
+ };
+ let eq_label = |lt: Option<ast::Lifetime>| {
+ lt.zip(label.as_ref()).map_or(false, |(lt, lbl)| lt.text() == lbl.text())
+ };
+ while let Some(node) = preorder.find_map(ev_as_expr) {
+ match node {
+ WalkEvent::Enter(expr) => match expr {
+ ast::Expr::LoopExpr(_) | ast::Expr::WhileExpr(_) | ast::Expr::ForExpr(_) => {
+ depth += 1
+ }
+ ast::Expr::BlockExpr(e) if e.label().is_some() => depth += 1,
+ ast::Expr::BreakExpr(b)
+ if (depth == 0 && b.lifetime().is_none()) || eq_label(b.lifetime()) =>
+ {
+ cb(b);
+ }
+ _ => (),
+ },
+ WalkEvent::Leave(expr) => match expr {
+ ast::Expr::LoopExpr(_) | ast::Expr::WhileExpr(_) | ast::Expr::ForExpr(_) => {
+ depth -= 1
+ }
+ ast::Expr::BlockExpr(e) if e.label().is_some() => depth -= 1,
+ _ => (),
+ },
}
}
}
}
-pub mod option {
- pub enum Option<T> { None, Some(T)}
-}
-
-pub mod prelude {
- pub use crate::{convert::From, iter::{IntoIterator, Iterator}, option::Option::{self, *}, default::Default};
-}
-#[prelude_import]
-pub use prelude::*;
-"#;
-
- pub fn core(&self) -> Option<Crate> {
- self.find_crate("core")
- }
-
- pub fn core_convert_From(&self) -> Option<Trait> {
- self.find_trait("core:convert:From")
- }
-
- pub fn core_option_Option(&self) -> Option<Enum> {
- self.find_enum("core:option:Option")
- }
-
- pub fn core_default_Default(&self) -> Option<Trait> {
- self.find_trait("core:default:Default")
- }
-
- pub fn core_iter_Iterator(&self) -> Option<Trait> {
- self.find_trait("core:iter:traits:iterator:Iterator")
- }
-
- pub fn core_iter(&self) -> Option<Module> {
- self.find_module("core:iter")
+/// Checks if the given lint is equal or is contained by the other lint which may or may not be a group.
+pub fn lint_eq_or_in_group(lint: &str, lint_is: &str) -> bool {
+ if lint == lint_is {
+ return true;
}
- fn find_trait(&self, path: &str) -> Option<Trait> {
- match self.find_def(path)? {
- hir::ScopeDef::ModuleDef(hir::ModuleDef::Trait(it)) => Some(it),
- _ => None,
- }
- }
-
- fn find_enum(&self, path: &str) -> Option<Enum> {
- match self.find_def(path)? {
- hir::ScopeDef::ModuleDef(hir::ModuleDef::Adt(hir::Adt::Enum(it))) => Some(it),
- _ => None,
- }
- }
-
- fn find_module(&self, path: &str) -> Option<Module> {
- match self.find_def(path)? {
- hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(it)) => Some(it),
- _ => None,
- }
- }
-
- fn find_crate(&self, name: &str) -> Option<Crate> {
- let krate = self.1?;
- let db = self.0.db;
- let res =
- krate.dependencies(db).into_iter().find(|dep| dep.name.to_string() == name)?.krate;
- Some(res)
+ if let Some(group) = generated_lints::DEFAULT_LINT_GROUPS
+ .iter()
+ .chain(generated_lints::CLIPPY_LINT_GROUPS.iter())
+ .chain(generated_lints::RUSTDOC_LINT_GROUPS.iter())
+ .find(|&check| check.lint.label == lint_is)
+ {
+ group.children.contains(&lint)
+ } else {
+ false
}
+}
- fn find_def(&self, path: &str) -> Option<ScopeDef> {
- let db = self.0.db;
- let mut path = path.split(':');
- let trait_ = path.next_back()?;
- let std_crate = path.next()?;
- let std_crate = self.find_crate(std_crate)?;
- let mut module = std_crate.root_module(db);
- for segment in path {
- module = module.children(db).find_map(|child| {
- let name = child.name(db)?;
- if name.to_string() == segment {
- Some(child)
- } else {
- None
- }
- })?;
- }
- let def =
- module.scope(db, None).into_iter().find(|(name, _def)| name.to_string() == trait_)?.1;
- Some(def)
- }
+/// Parses the input token tree as comma separated plain paths.
+pub fn parse_tt_as_comma_sep_paths(input: ast::TokenTree) -> Option<Vec<ast::Path>> {
+ let r_paren = input.r_paren_token();
+ let tokens =
+ input.syntax().children_with_tokens().skip(1).map_while(|it| match it.into_token() {
+ // seeing a keyword means the attribute is unclosed so stop parsing here
+ Some(tok) if tok.kind().is_keyword() => None,
+ // don't include the right token tree parenthesis if it exists
+ tok @ Some(_) if tok == r_paren => None,
+ // only nodes that we can find are other TokenTrees, those are unexpected in this parse though
+ None => None,
+ Some(tok) => Some(tok),
+ });
+ let input_expressions = tokens.into_iter().group_by(|tok| tok.kind() == T![,]);
+ let paths = input_expressions
+ .into_iter()
+ .filter_map(|(is_sep, group)| (!is_sep).then(|| group))
+ .filter_map(|mut tokens| {
+ syntax::hacks::parse_expr_from_str(&tokens.join("")).and_then(|expr| match expr {
+ ast::Expr::PathExpr(it) => it.path(),
+ _ => None,
+ })
+ })
+ .collect();
+ Some(paths)
}
projects / rust.git / blobdiff