128 lines
4.1 KiB
Rust
128 lines
4.1 KiB
Rust
//! Random assortment of ide helpers for high-level ide features that don't fit in any other module.
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use std::collections::VecDeque;
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use base_db::{FileId, SourceDatabaseExt};
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use hir::{Crate, ItemInNs, ModuleDef, Name, Semantics};
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use syntax::{
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ast::{self, make},
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AstToken, SyntaxKind, SyntaxToken, TokenAtOffset,
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};
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use crate::{
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defs::{Definition, IdentClass},
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generated, RootDatabase,
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};
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pub fn item_name(db: &RootDatabase, item: ItemInNs) -> Option<Name> {
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match item {
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ItemInNs::Types(module_def_id) => module_def_id.name(db),
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ItemInNs::Values(module_def_id) => module_def_id.name(db),
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ItemInNs::Macros(macro_def_id) => Some(macro_def_id.name(db)),
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}
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}
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/// Picks the token with the highest rank returned by the passed in function.
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pub fn pick_best_token(
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tokens: TokenAtOffset<SyntaxToken>,
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f: impl Fn(SyntaxKind) -> usize,
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) -> Option<SyntaxToken> {
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tokens.max_by_key(move |t| f(t.kind()))
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}
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pub fn pick_token<T: AstToken>(mut tokens: TokenAtOffset<SyntaxToken>) -> Option<T> {
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tokens.find_map(T::cast)
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}
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/// Converts the mod path struct into its ast representation.
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pub fn mod_path_to_ast(path: &hir::ModPath) -> ast::Path {
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let _p = profile::span("mod_path_to_ast");
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let mut segments = Vec::new();
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let mut is_abs = false;
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match path.kind {
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hir::PathKind::Plain => {}
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hir::PathKind::Super(0) => segments.push(make::path_segment_self()),
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hir::PathKind::Super(n) => segments.extend((0..n).map(|_| make::path_segment_super())),
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hir::PathKind::DollarCrate(_) | hir::PathKind::Crate => {
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segments.push(make::path_segment_crate())
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}
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hir::PathKind::Abs => is_abs = true,
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}
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segments.extend(
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path.segments()
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.iter()
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.map(|segment| make::path_segment(make::name_ref(&segment.to_smol_str()))),
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);
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make::path_from_segments(segments, is_abs)
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}
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/// Iterates all `ModuleDef`s and `Impl` blocks of the given file.
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pub fn visit_file_defs(
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sema: &Semantics<'_, RootDatabase>,
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file_id: FileId,
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cb: &mut dyn FnMut(Definition),
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) {
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let db = sema.db;
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let module = match sema.to_module_def(file_id) {
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Some(it) => it,
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None => return,
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};
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let mut defs: VecDeque<_> = module.declarations(db).into();
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while let Some(def) = defs.pop_front() {
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if let ModuleDef::Module(submodule) = def {
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if let hir::ModuleSource::Module(_) = submodule.definition_source(db).value {
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defs.extend(submodule.declarations(db));
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submodule.impl_defs(db).into_iter().for_each(|impl_| cb(impl_.into()));
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}
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}
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cb(def.into());
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}
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module.impl_defs(db).into_iter().for_each(|impl_| cb(impl_.into()));
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let is_root = module.is_crate_root();
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module
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.legacy_macros(db)
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.into_iter()
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// don't show legacy macros declared in the crate-root that were already covered in declarations earlier
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.filter(|it| !(is_root && it.is_macro_export(db)))
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.for_each(|mac| cb(mac.into()));
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}
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/// Checks if the given lint is equal or is contained by the other lint which may or may not be a group.
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pub fn lint_eq_or_in_group(lint: &str, lint_is: &str) -> bool {
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if lint == lint_is {
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return true;
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}
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if let Some(group) = generated::lints::DEFAULT_LINT_GROUPS
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.iter()
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.chain(generated::lints::CLIPPY_LINT_GROUPS.iter())
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.chain(generated::lints::RUSTDOC_LINT_GROUPS.iter())
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.find(|&check| check.lint.label == lint_is)
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{
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group.children.contains(&lint)
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} else {
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false
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}
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}
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pub fn is_editable_crate(krate: Crate, db: &RootDatabase) -> bool {
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let root_file = krate.root_file(db);
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let source_root_id = db.file_source_root(root_file);
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!db.source_root(source_root_id).is_library
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}
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pub fn get_definition(
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sema: &Semantics<'_, RootDatabase>,
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token: SyntaxToken,
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) -> Option<Definition> {
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for token in sema.descend_into_macros(token) {
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let def = IdentClass::classify_token(sema, &token).map(IdentClass::definitions_no_ops);
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if let Some(&[x]) = def.as_deref() {
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return Some(x);
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}
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}
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None
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}
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