aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_hir/src/has_source.rs
blob: b09582f93c8b5ef212071f66b589e0bc65bf939f (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
//! FIXME: write short doc here

use either::Either;
use hir_def::{
    nameres::ModuleSource,
    src::{HasChildSource, HasSource as _},
    AstItemDef, Lookup, VariantId,
};
use ra_syntax::ast;

use crate::{
    db::DefDatabase, Const, Enum, EnumVariant, FieldSource, Function, ImplBlock, Import, MacroDef,
    Module, Static, Struct, StructField, Trait, TypeAlias, TypeParam, Union,
};

pub use hir_expand::InFile;

pub trait HasSource {
    type Ast;
    fn source(self, db: &impl DefDatabase) -> InFile<Self::Ast>;
}

/// NB: Module is !HasSource, because it has two source nodes at the same time:
/// definition and declaration.
impl Module {
    /// Returns a node which defines this module. That is, a file or a `mod foo {}` with items.
    pub fn definition_source(self, db: &impl DefDatabase) -> InFile<ModuleSource> {
        let def_map = db.crate_def_map(self.id.krate);
        def_map[self.id.local_id].definition_source(db)
    }

    /// Returns a node which declares this module, either a `mod foo;` or a `mod foo {}`.
    /// `None` for the crate root.
    pub fn declaration_source(self, db: &impl DefDatabase) -> Option<InFile<ast::Module>> {
        let def_map = db.crate_def_map(self.id.krate);
        def_map[self.id.local_id].declaration_source(db)
    }
}

impl HasSource for StructField {
    type Ast = FieldSource;
    fn source(self, db: &impl DefDatabase) -> InFile<FieldSource> {
        let var = VariantId::from(self.parent);
        let src = var.child_source(db);
        src.map(|it| match it[self.id].clone() {
            Either::Left(it) => FieldSource::Pos(it),
            Either::Right(it) => FieldSource::Named(it),
        })
    }
}
impl HasSource for Struct {
    type Ast = ast::StructDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::StructDef> {
        self.id.source(db)
    }
}
impl HasSource for Union {
    type Ast = ast::UnionDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::UnionDef> {
        self.id.source(db)
    }
}
impl HasSource for Enum {
    type Ast = ast::EnumDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::EnumDef> {
        self.id.source(db)
    }
}
impl HasSource for EnumVariant {
    type Ast = ast::EnumVariant;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::EnumVariant> {
        self.parent.id.child_source(db).map(|map| map[self.id].clone())
    }
}
impl HasSource for Function {
    type Ast = ast::FnDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::FnDef> {
        self.id.lookup(db).source(db)
    }
}
impl HasSource for Const {
    type Ast = ast::ConstDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::ConstDef> {
        self.id.lookup(db).source(db)
    }
}
impl HasSource for Static {
    type Ast = ast::StaticDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::StaticDef> {
        self.id.lookup(db).source(db)
    }
}
impl HasSource for Trait {
    type Ast = ast::TraitDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::TraitDef> {
        self.id.source(db)
    }
}
impl HasSource for TypeAlias {
    type Ast = ast::TypeAliasDef;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::TypeAliasDef> {
        self.id.lookup(db).source(db)
    }
}
impl HasSource for MacroDef {
    type Ast = ast::MacroCall;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::MacroCall> {
        InFile {
            file_id: self.id.ast_id.expect("MacroDef without ast_id").file_id,
            value: self.id.ast_id.expect("MacroDef without ast_id").to_node(db),
        }
    }
}
impl HasSource for ImplBlock {
    type Ast = ast::ImplBlock;
    fn source(self, db: &impl DefDatabase) -> InFile<ast::ImplBlock> {
        self.id.source(db)
    }
}
impl HasSource for Import {
    type Ast = Either<ast::UseTree, ast::ExternCrateItem>;

    /// Returns the syntax of the last path segment corresponding to this import
    fn source(self, db: &impl DefDatabase) -> InFile<Self::Ast> {
        let src = self.parent.definition_source(db);
        let (_, source_map) = db.raw_items_with_source_map(src.file_id);
        let root = db.parse_or_expand(src.file_id).unwrap();
        let ptr = source_map.get(self.id);
        src.with_value(ptr.map_left(|it| it.to_node(&root)).map_right(|it| it.to_node(&root)))
    }
}

impl HasSource for TypeParam {
    type Ast = Either<ast::TraitDef, ast::TypeParam>;
    fn source(self, db: &impl DefDatabase) -> InFile<Self::Ast> {
        let child_source = self.id.parent.child_source(db);
        child_source.map(|it| it[self.id.local_id].clone())
    }
}