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Diffstat (limited to 'crates/ra_hir/src/module/mod.rs')
-rw-r--r-- | crates/ra_hir/src/module/mod.rs | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/crates/ra_hir/src/module/mod.rs b/crates/ra_hir/src/module/mod.rs new file mode 100644 index 000000000..81b9f948d --- /dev/null +++ b/crates/ra_hir/src/module/mod.rs | |||
@@ -0,0 +1,378 @@ | |||
1 | pub(super) mod imp; | ||
2 | pub(super) mod nameres; | ||
3 | |||
4 | use std::sync::Arc; | ||
5 | |||
6 | use ra_editor::find_node_at_offset; | ||
7 | |||
8 | use ra_syntax::{ | ||
9 | algo::generate, | ||
10 | ast::{self, AstNode, NameOwner}, | ||
11 | SmolStr, SyntaxNode, | ||
12 | }; | ||
13 | use ra_db::{SourceRootId, FileId, FilePosition, Cancelable}; | ||
14 | use relative_path::RelativePathBuf; | ||
15 | |||
16 | use crate::{ | ||
17 | DefLoc, DefId, Path, PathKind, HirDatabase, SourceItemId, | ||
18 | arena::{Arena, Id}, | ||
19 | }; | ||
20 | |||
21 | pub(crate) use self::nameres::ModuleScope; | ||
22 | |||
23 | /// `Module` is API entry point to get all the information | ||
24 | /// about a particular module. | ||
25 | #[derive(Debug, Clone)] | ||
26 | pub(crate) struct Module { | ||
27 | tree: Arc<ModuleTree>, | ||
28 | source_root_id: SourceRootId, | ||
29 | module_id: ModuleId, | ||
30 | } | ||
31 | |||
32 | impl Module { | ||
33 | /// Lookup `Module` by `FileId`. Note that this is inherently | ||
34 | /// lossy transformation: in general, a single source might correspond to | ||
35 | /// several modules. | ||
36 | pub fn guess_from_file_id( | ||
37 | db: &impl HirDatabase, | ||
38 | file_id: FileId, | ||
39 | ) -> Cancelable<Option<Module>> { | ||
40 | Module::guess_from_source(db, file_id, ModuleSource::SourceFile(file_id)) | ||
41 | } | ||
42 | |||
43 | /// Lookup `Module` by position in the source code. Note that this | ||
44 | /// is inherently lossy transformation: in general, a single source might | ||
45 | /// correspond to several modules. | ||
46 | pub fn guess_from_position( | ||
47 | db: &impl HirDatabase, | ||
48 | position: FilePosition, | ||
49 | ) -> Cancelable<Option<Module>> { | ||
50 | let file = db.source_file(position.file_id); | ||
51 | let module_source = match find_node_at_offset::<ast::Module>(file.syntax(), position.offset) | ||
52 | { | ||
53 | Some(m) if !m.has_semi() => ModuleSource::new_inline(db, position.file_id, m), | ||
54 | _ => ModuleSource::SourceFile(position.file_id), | ||
55 | }; | ||
56 | Module::guess_from_source(db, position.file_id, module_source) | ||
57 | } | ||
58 | |||
59 | fn guess_from_source( | ||
60 | db: &impl HirDatabase, | ||
61 | file_id: FileId, | ||
62 | module_source: ModuleSource, | ||
63 | ) -> Cancelable<Option<Module>> { | ||
64 | let source_root_id = db.file_source_root(file_id); | ||
65 | let module_tree = db.module_tree(source_root_id)?; | ||
66 | |||
67 | let res = match module_tree.any_module_for_source(module_source) { | ||
68 | None => None, | ||
69 | Some(module_id) => Some(Module { | ||
70 | tree: module_tree, | ||
71 | source_root_id, | ||
72 | module_id, | ||
73 | }), | ||
74 | }; | ||
75 | Ok(res) | ||
76 | } | ||
77 | |||
78 | pub(super) fn new( | ||
79 | db: &impl HirDatabase, | ||
80 | source_root_id: SourceRootId, | ||
81 | module_id: ModuleId, | ||
82 | ) -> Cancelable<Module> { | ||
83 | let module_tree = db.module_tree(source_root_id)?; | ||
84 | let res = Module { | ||
85 | tree: module_tree, | ||
86 | source_root_id, | ||
87 | module_id, | ||
88 | }; | ||
89 | Ok(res) | ||
90 | } | ||
91 | |||
92 | /// Returns `mod foo;` or `mod foo {}` node whihc declared this module. | ||
93 | /// Returns `None` for the root module | ||
94 | pub fn parent_link_source(&self, db: &impl HirDatabase) -> Option<(FileId, ast::ModuleNode)> { | ||
95 | let link = self.module_id.parent_link(&self.tree)?; | ||
96 | let file_id = link.owner(&self.tree).source(&self.tree).file_id(); | ||
97 | let src = link.bind_source(&self.tree, db); | ||
98 | Some((file_id, src)) | ||
99 | } | ||
100 | |||
101 | pub fn source(&self) -> ModuleSource { | ||
102 | self.module_id.source(&self.tree) | ||
103 | } | ||
104 | |||
105 | /// Parent module. Returns `None` if this is a root module. | ||
106 | pub fn parent(&self) -> Option<Module> { | ||
107 | let parent_id = self.module_id.parent(&self.tree)?; | ||
108 | Some(Module { | ||
109 | module_id: parent_id, | ||
110 | ..self.clone() | ||
111 | }) | ||
112 | } | ||
113 | |||
114 | /// The root of the tree this module is part of | ||
115 | pub fn crate_root(&self) -> Module { | ||
116 | let root_id = self.module_id.crate_root(&self.tree); | ||
117 | Module { | ||
118 | module_id: root_id, | ||
119 | ..self.clone() | ||
120 | } | ||
121 | } | ||
122 | |||
123 | /// `name` is `None` for the crate's root module | ||
124 | #[allow(unused)] | ||
125 | pub fn name(&self) -> Option<SmolStr> { | ||
126 | let link = self.module_id.parent_link(&self.tree)?; | ||
127 | Some(link.name(&self.tree)) | ||
128 | } | ||
129 | |||
130 | pub fn def_id(&self, db: &impl HirDatabase) -> DefId { | ||
131 | let def_loc = DefLoc::Module { | ||
132 | id: self.module_id, | ||
133 | source_root: self.source_root_id, | ||
134 | }; | ||
135 | def_loc.id(db) | ||
136 | } | ||
137 | |||
138 | /// Finds a child module with the specified name. | ||
139 | pub fn child(&self, name: &str) -> Option<Module> { | ||
140 | let child_id = self.module_id.child(&self.tree, name)?; | ||
141 | Some(Module { | ||
142 | module_id: child_id, | ||
143 | ..self.clone() | ||
144 | }) | ||
145 | } | ||
146 | |||
147 | /// Returns a `ModuleScope`: a set of items, visible in this module. | ||
148 | pub(crate) fn scope(&self, db: &impl HirDatabase) -> Cancelable<ModuleScope> { | ||
149 | let item_map = db.item_map(self.source_root_id)?; | ||
150 | let res = item_map.per_module[&self.module_id].clone(); | ||
151 | Ok(res) | ||
152 | } | ||
153 | |||
154 | pub(crate) fn resolve_path( | ||
155 | &self, | ||
156 | db: &impl HirDatabase, | ||
157 | path: Path, | ||
158 | ) -> Cancelable<Option<DefId>> { | ||
159 | let mut curr = match path.kind { | ||
160 | PathKind::Crate => self.crate_root(), | ||
161 | PathKind::Self_ | PathKind::Plain => self.clone(), | ||
162 | PathKind::Super => ctry!(self.parent()), | ||
163 | } | ||
164 | .def_id(db); | ||
165 | |||
166 | let segments = path.segments; | ||
167 | for name in segments.iter() { | ||
168 | let module = match curr.loc(db) { | ||
169 | DefLoc::Module { id, source_root } => Module::new(db, source_root, id)?, | ||
170 | _ => return Ok(None), | ||
171 | }; | ||
172 | let scope = module.scope(db)?; | ||
173 | curr = ctry!(ctry!(scope.get(&name)).def_id); | ||
174 | } | ||
175 | Ok(Some(curr)) | ||
176 | } | ||
177 | |||
178 | pub fn problems(&self, db: &impl HirDatabase) -> Vec<(SyntaxNode, Problem)> { | ||
179 | self.module_id.problems(&self.tree, db) | ||
180 | } | ||
181 | } | ||
182 | |||
183 | /// Phisically, rust source is organized as a set of files, but logically it is | ||
184 | /// organized as a tree of modules. Usually, a single file corresponds to a | ||
185 | /// single module, but it is not nessary the case. | ||
186 | /// | ||
187 | /// Module encapsulate the logic of transitioning from the fuzzy world of files | ||
188 | /// (which can have multiple parents) to the precise world of modules (which | ||
189 | /// always have one parent). | ||
190 | #[derive(Default, Debug, PartialEq, Eq)] | ||
191 | pub(crate) struct ModuleTree { | ||
192 | mods: Arena<ModuleData>, | ||
193 | links: Arena<LinkData>, | ||
194 | } | ||
195 | |||
196 | impl ModuleTree { | ||
197 | pub(crate) fn modules<'a>(&'a self) -> impl Iterator<Item = ModuleId> + 'a { | ||
198 | self.mods.iter().map(|(id, _)| id) | ||
199 | } | ||
200 | |||
201 | fn modules_for_source(&self, source: ModuleSource) -> Vec<ModuleId> { | ||
202 | self.mods | ||
203 | .iter() | ||
204 | .filter(|(_idx, it)| it.source == source) | ||
205 | .map(|(idx, _)| idx) | ||
206 | .collect() | ||
207 | } | ||
208 | |||
209 | fn any_module_for_source(&self, source: ModuleSource) -> Option<ModuleId> { | ||
210 | self.modules_for_source(source).pop() | ||
211 | } | ||
212 | } | ||
213 | |||
214 | /// `ModuleSource` is the syntax tree element that produced this module: | ||
215 | /// either a file, or an inlinde module. | ||
216 | #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)] | ||
217 | pub(crate) enum ModuleSource { | ||
218 | SourceFile(FileId), | ||
219 | Module(SourceItemId), | ||
220 | } | ||
221 | |||
222 | /// An owned syntax node for a module. Unlike `ModuleSource`, | ||
223 | /// this holds onto the AST for the whole file. | ||
224 | pub(crate) enum ModuleSourceNode { | ||
225 | SourceFile(ast::SourceFileNode), | ||
226 | Module(ast::ModuleNode), | ||
227 | } | ||
228 | |||
229 | pub(crate) type ModuleId = Id<ModuleData>; | ||
230 | type LinkId = Id<LinkData>; | ||
231 | |||
232 | #[derive(Clone, Debug, Hash, PartialEq, Eq)] | ||
233 | pub enum Problem { | ||
234 | UnresolvedModule { | ||
235 | candidate: RelativePathBuf, | ||
236 | }, | ||
237 | NotDirOwner { | ||
238 | move_to: RelativePathBuf, | ||
239 | candidate: RelativePathBuf, | ||
240 | }, | ||
241 | } | ||
242 | |||
243 | impl ModuleId { | ||
244 | pub(crate) fn source(self, tree: &ModuleTree) -> ModuleSource { | ||
245 | tree.mods[self].source | ||
246 | } | ||
247 | fn parent_link(self, tree: &ModuleTree) -> Option<LinkId> { | ||
248 | tree.mods[self].parent | ||
249 | } | ||
250 | fn parent(self, tree: &ModuleTree) -> Option<ModuleId> { | ||
251 | let link = self.parent_link(tree)?; | ||
252 | Some(tree.links[link].owner) | ||
253 | } | ||
254 | fn crate_root(self, tree: &ModuleTree) -> ModuleId { | ||
255 | generate(Some(self), move |it| it.parent(tree)) | ||
256 | .last() | ||
257 | .unwrap() | ||
258 | } | ||
259 | fn child(self, tree: &ModuleTree, name: &str) -> Option<ModuleId> { | ||
260 | let link = tree.mods[self] | ||
261 | .children | ||
262 | .iter() | ||
263 | .map(|&it| &tree.links[it]) | ||
264 | .find(|it| it.name == name)?; | ||
265 | Some(*link.points_to.first()?) | ||
266 | } | ||
267 | fn children<'a>(self, tree: &'a ModuleTree) -> impl Iterator<Item = (SmolStr, ModuleId)> + 'a { | ||
268 | tree.mods[self].children.iter().filter_map(move |&it| { | ||
269 | let link = &tree.links[it]; | ||
270 | let module = *link.points_to.first()?; | ||
271 | Some((link.name.clone(), module)) | ||
272 | }) | ||
273 | } | ||
274 | fn problems(self, tree: &ModuleTree, db: &impl HirDatabase) -> Vec<(SyntaxNode, Problem)> { | ||
275 | tree.mods[self] | ||
276 | .children | ||
277 | .iter() | ||
278 | .filter_map(|&it| { | ||
279 | let p = tree.links[it].problem.clone()?; | ||
280 | let s = it.bind_source(tree, db); | ||
281 | let s = s.borrowed().name().unwrap().syntax().owned(); | ||
282 | Some((s, p)) | ||
283 | }) | ||
284 | .collect() | ||
285 | } | ||
286 | } | ||
287 | |||
288 | impl LinkId { | ||
289 | fn owner(self, tree: &ModuleTree) -> ModuleId { | ||
290 | tree.links[self].owner | ||
291 | } | ||
292 | fn name(self, tree: &ModuleTree) -> SmolStr { | ||
293 | tree.links[self].name.clone() | ||
294 | } | ||
295 | fn bind_source<'a>(self, tree: &ModuleTree, db: &impl HirDatabase) -> ast::ModuleNode { | ||
296 | let owner = self.owner(tree); | ||
297 | match owner.source(tree).resolve(db) { | ||
298 | ModuleSourceNode::SourceFile(root) => { | ||
299 | let ast = imp::modules(root.borrowed()) | ||
300 | .find(|(name, _)| name == &tree.links[self].name) | ||
301 | .unwrap() | ||
302 | .1; | ||
303 | ast.owned() | ||
304 | } | ||
305 | ModuleSourceNode::Module(it) => it, | ||
306 | } | ||
307 | } | ||
308 | } | ||
309 | |||
310 | #[derive(Debug, PartialEq, Eq, Hash)] | ||
311 | pub(crate) struct ModuleData { | ||
312 | source: ModuleSource, | ||
313 | parent: Option<LinkId>, | ||
314 | children: Vec<LinkId>, | ||
315 | } | ||
316 | |||
317 | impl ModuleSource { | ||
318 | pub(crate) fn new_inline( | ||
319 | db: &impl HirDatabase, | ||
320 | file_id: FileId, | ||
321 | module: ast::Module, | ||
322 | ) -> ModuleSource { | ||
323 | assert!(!module.has_semi()); | ||
324 | let items = db.file_items(file_id); | ||
325 | let item_id = items.id_of(module.syntax()); | ||
326 | let id = SourceItemId { file_id, item_id }; | ||
327 | ModuleSource::Module(id) | ||
328 | } | ||
329 | |||
330 | pub(crate) fn as_file(self) -> Option<FileId> { | ||
331 | match self { | ||
332 | ModuleSource::SourceFile(f) => Some(f), | ||
333 | ModuleSource::Module(..) => None, | ||
334 | } | ||
335 | } | ||
336 | |||
337 | pub(crate) fn file_id(self) -> FileId { | ||
338 | match self { | ||
339 | ModuleSource::SourceFile(f) => f, | ||
340 | ModuleSource::Module(source_item_id) => source_item_id.file_id, | ||
341 | } | ||
342 | } | ||
343 | |||
344 | pub(crate) fn resolve(self, db: &impl HirDatabase) -> ModuleSourceNode { | ||
345 | match self { | ||
346 | ModuleSource::SourceFile(file_id) => { | ||
347 | let syntax = db.source_file(file_id); | ||
348 | ModuleSourceNode::SourceFile(syntax.ast().owned()) | ||
349 | } | ||
350 | ModuleSource::Module(item_id) => { | ||
351 | let syntax = db.file_item(item_id); | ||
352 | let syntax = syntax.borrowed(); | ||
353 | let module = ast::Module::cast(syntax).unwrap(); | ||
354 | ModuleSourceNode::Module(module.owned()) | ||
355 | } | ||
356 | } | ||
357 | } | ||
358 | } | ||
359 | |||
360 | #[derive(Hash, Debug, PartialEq, Eq)] | ||
361 | struct LinkData { | ||
362 | owner: ModuleId, | ||
363 | name: SmolStr, | ||
364 | points_to: Vec<ModuleId>, | ||
365 | problem: Option<Problem>, | ||
366 | } | ||
367 | |||
368 | impl ModuleTree { | ||
369 | fn push_mod(&mut self, data: ModuleData) -> ModuleId { | ||
370 | self.mods.alloc(data) | ||
371 | } | ||
372 | fn push_link(&mut self, data: LinkData) -> LinkId { | ||
373 | let owner = data.owner; | ||
374 | let id = self.links.alloc(data); | ||
375 | self.mods[owner].children.push(id); | ||
376 | id | ||
377 | } | ||
378 | } | ||