aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_hir/src/from_source.rs
blob: 18d87f6d70ce1ff5b3d767f4dcb9091cc129de97 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
//! FIXME: write short doc here

use hir_def::{nameres::ModuleSource, AstItemDef, LocationCtx, ModuleId};
use hir_expand::{name::AsName, AstId, MacroDefId, MacroDefKind};
use ra_syntax::{
    ast::{self, AstNode, NameOwner},
    match_ast, AstPtr, SyntaxNode,
};

use crate::{
    db::{AstDatabase, DefDatabase, HirDatabase},
    AssocItem, Const, DefWithBody, Enum, EnumVariant, FieldSource, Function, HasSource, ImplBlock,
    InFile, Local, MacroDef, Module, ModuleDef, Static, Struct, StructField, Trait, TypeAlias,
    Union, VariantDef,
};

pub trait FromSource: Sized {
    type Ast;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self>;
}

impl FromSource for Struct {
    type Ast = ast::StructDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let id = from_source(db, src)?;
        Some(Struct { id })
    }
}
impl FromSource for Union {
    type Ast = ast::UnionDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let id = from_source(db, src)?;
        Some(Union { id })
    }
}
impl FromSource for Enum {
    type Ast = ast::EnumDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let id = from_source(db, src)?;
        Some(Enum { id })
    }
}
impl FromSource for Trait {
    type Ast = ast::TraitDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let id = from_source(db, src)?;
        Some(Trait { id })
    }
}
impl FromSource for Function {
    type Ast = ast::FnDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let items = match Container::find(db, src.as_ref().map(|it| it.syntax()))? {
            Container::Trait(it) => it.items(db),
            Container::ImplBlock(it) => it.items(db),
            Container::Module(m) => {
                return m
                    .declarations(db)
                    .into_iter()
                    .filter_map(|it| match it {
                        ModuleDef::Function(it) => Some(it),
                        _ => None,
                    })
                    .find(|it| same_source(&it.source(db), &src))
            }
        };
        items
            .into_iter()
            .filter_map(|it| match it {
                AssocItem::Function(it) => Some(it),
                _ => None,
            })
            .find(|it| same_source(&it.source(db), &src))
    }
}

impl FromSource for Const {
    type Ast = ast::ConstDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let items = match Container::find(db, src.as_ref().map(|it| it.syntax()))? {
            Container::Trait(it) => it.items(db),
            Container::ImplBlock(it) => it.items(db),
            Container::Module(m) => {
                return m
                    .declarations(db)
                    .into_iter()
                    .filter_map(|it| match it {
                        ModuleDef::Const(it) => Some(it),
                        _ => None,
                    })
                    .find(|it| same_source(&it.source(db), &src))
            }
        };
        items
            .into_iter()
            .filter_map(|it| match it {
                AssocItem::Const(it) => Some(it),
                _ => None,
            })
            .find(|it| same_source(&it.source(db), &src))
    }
}
impl FromSource for Static {
    type Ast = ast::StaticDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let module = match Container::find(db, src.as_ref().map(|it| it.syntax()))? {
            Container::Module(it) => it,
            Container::Trait(_) | Container::ImplBlock(_) => return None,
        };
        module
            .declarations(db)
            .into_iter()
            .filter_map(|it| match it {
                ModuleDef::Static(it) => Some(it),
                _ => None,
            })
            .find(|it| same_source(&it.source(db), &src))
    }
}

impl FromSource for TypeAlias {
    type Ast = ast::TypeAliasDef;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let items = match Container::find(db, src.as_ref().map(|it| it.syntax()))? {
            Container::Trait(it) => it.items(db),
            Container::ImplBlock(it) => it.items(db),
            Container::Module(m) => {
                return m
                    .declarations(db)
                    .into_iter()
                    .filter_map(|it| match it {
                        ModuleDef::TypeAlias(it) => Some(it),
                        _ => None,
                    })
                    .find(|it| same_source(&it.source(db), &src))
            }
        };
        items
            .into_iter()
            .filter_map(|it| match it {
                AssocItem::TypeAlias(it) => Some(it),
                _ => None,
            })
            .find(|it| same_source(&it.source(db), &src))
    }
}

impl FromSource for MacroDef {
    type Ast = ast::MacroCall;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let kind = MacroDefKind::Declarative;

        let module_src = ModuleSource::from_child_node(db, src.as_ref().map(|it| it.syntax()));
        let module = Module::from_definition(db, InFile::new(src.file_id, module_src))?;
        let krate = module.krate().crate_id();

        let ast_id = AstId::new(src.file_id, db.ast_id_map(src.file_id).ast_id(&src.value));

        let id: MacroDefId = MacroDefId { krate, ast_id, kind };
        Some(MacroDef { id })
    }
}

impl FromSource for ImplBlock {
    type Ast = ast::ImplBlock;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let id = from_source(db, src)?;
        Some(ImplBlock { id })
    }
}

impl FromSource for EnumVariant {
    type Ast = ast::EnumVariant;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let parent_enum = src.value.parent_enum();
        let src_enum = InFile { file_id: src.file_id, value: parent_enum };
        let variants = Enum::from_source(db, src_enum)?.variants(db);
        variants.into_iter().find(|v| same_source(&v.source(db), &src))
    }
}

impl FromSource for StructField {
    type Ast = FieldSource;
    fn from_source(db: &(impl DefDatabase + AstDatabase), src: InFile<Self::Ast>) -> Option<Self> {
        let variant_def: VariantDef = match src.value {
            FieldSource::Named(ref field) => {
                let value = field.syntax().ancestors().find_map(ast::StructDef::cast)?;
                let src = InFile { file_id: src.file_id, value };
                let def = Struct::from_source(db, src)?;
                VariantDef::from(def)
            }
            FieldSource::Pos(ref field) => {
                let value = field.syntax().ancestors().find_map(ast::EnumVariant::cast)?;
                let src = InFile { file_id: src.file_id, value };
                let def = EnumVariant::from_source(db, src)?;
                VariantDef::from(def)
            }
        };
        variant_def
            .variant_data(db)
            .fields()
            .iter()
            .map(|(id, _)| StructField { parent: variant_def, id })
            .find(|f| f.source(db) == src)
    }
}

impl Local {
    pub fn from_source(db: &impl HirDatabase, src: InFile<ast::BindPat>) -> Option<Self> {
        let file_id = src.file_id;
        let parent: DefWithBody = src.value.syntax().ancestors().find_map(|it| {
            let res = match_ast! {
                match it {
                    ast::ConstDef(value) => { Const::from_source(db, InFile { value, file_id})?.into() },
                    ast::StaticDef(value) => { Static::from_source(db, InFile { value, file_id})?.into() },
                    ast::FnDef(value) => { Function::from_source(db, InFile { value, file_id})?.into() },
                    _ => return None,
                }
            };
            Some(res)
        })?;
        let (_body, source_map) = db.body_with_source_map(parent.into());
        let src = src.map(ast::Pat::from);
        let pat_id = source_map.node_pat(src.as_ref())?;
        Some(Local { parent, pat_id })
    }
}

impl Module {
    pub fn from_declaration(db: &impl DefDatabase, src: InFile<ast::Module>) -> Option<Self> {
        let parent_declaration = src.value.syntax().ancestors().skip(1).find_map(ast::Module::cast);

        let parent_module = match parent_declaration {
            Some(parent_declaration) => {
                let src_parent = InFile { file_id: src.file_id, value: parent_declaration };
                Module::from_declaration(db, src_parent)
            }
            None => {
                let source_file = db.parse(src.file_id.original_file(db)).tree();
                let src_parent =
                    InFile { file_id: src.file_id, value: ModuleSource::SourceFile(source_file) };
                Module::from_definition(db, src_parent)
            }
        }?;

        let child_name = src.value.name()?;
        parent_module.child(db, &child_name.as_name())
    }

    pub fn from_definition(db: &impl DefDatabase, src: InFile<ModuleSource>) -> Option<Self> {
        match src.value {
            ModuleSource::Module(ref module) => {
                assert!(!module.has_semi());
                return Module::from_declaration(
                    db,
                    InFile { file_id: src.file_id, value: module.clone() },
                );
            }
            ModuleSource::SourceFile(_) => (),
        };

        let original_file = src.file_id.original_file(db);

        let (krate, local_id) = db.relevant_crates(original_file).iter().find_map(|&crate_id| {
            let crate_def_map = db.crate_def_map(crate_id);
            let local_id = crate_def_map.modules_for_file(original_file).next()?;
            Some((crate_id, local_id))
        })?;
        Some(Module { id: ModuleId { krate, local_id } })
    }
}

fn from_source<N, DEF>(db: &(impl DefDatabase + AstDatabase), src: InFile<N>) -> Option<DEF>
where
    N: AstNode,
    DEF: AstItemDef<N>,
{
    let module_src = ModuleSource::from_child_node(db, src.as_ref().map(|it| it.syntax()));
    let module = Module::from_definition(db, InFile::new(src.file_id, module_src))?;
    let ctx = LocationCtx::new(db, module.id, src.file_id);
    let items = db.ast_id_map(src.file_id);
    let item_id = items.ast_id(&src.value);
    Some(DEF::from_ast_id(ctx, item_id))
}

enum Container {
    Trait(Trait),
    ImplBlock(ImplBlock),
    Module(Module),
}

impl Container {
    fn find(db: &impl DefDatabase, src: InFile<&SyntaxNode>) -> Option<Container> {
        // FIXME: this doesn't try to handle nested declarations
        for container in src.value.ancestors() {
            let res = match_ast! {
                match container {
                    ast::TraitDef(it) => {
                        let c = Trait::from_source(db, src.with_value(it))?;
                        Container::Trait(c)
                    },
                    ast::ImplBlock(it) => {
                        let c = ImplBlock::from_source(db, src.with_value(it))?;
                        Container::ImplBlock(c)
                     },
                    _ => { continue },
                }
            };
            return Some(res);
        }

        let module_source = ModuleSource::from_child_node(db, src);
        let c = Module::from_definition(db, src.with_value(module_source))?;
        Some(Container::Module(c))
    }
}

/// XXX: AST Nodes and SyntaxNodes have identity equality semantics: nodes are
/// equal if they point to exactly the same object.
///
/// In general, we do not guarantee that we have exactly one instance of a
/// syntax tree for each file. We probably should add such guarantee, but, for
/// the time being, we will use identity-less AstPtr comparison.
fn same_source<N: AstNode>(s1: &InFile<N>, s2: &InFile<N>) -> bool {
    s1.as_ref().map(AstPtr::new) == s2.as_ref().map(AstPtr::new)
}