aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_ide_api/src/impls.rs
blob: f8a62bd7104b594badcec021516548554cacc380 (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
use hir::{db::HirDatabase, source_binder};
use ra_db::SourceDatabase;
use ra_syntax::{algo::find_node_at_offset, ast, AstNode};

use crate::{db::RootDatabase, FilePosition, NavigationTarget, RangeInfo};

pub(crate) fn goto_implementation(
    db: &RootDatabase,
    position: FilePosition,
) -> Option<RangeInfo<Vec<NavigationTarget>>> {
    let file = db.parse(position.file_id).tree;
    let syntax = file.syntax();

    let module = source_binder::module_from_position(db, position)?;

    if let Some(nominal_def) = find_node_at_offset::<ast::NominalDef>(syntax, position.offset) {
        return Some(RangeInfo::new(
            nominal_def.syntax().range(),
            impls_for_def(db, nominal_def, module)?,
        ));
    } else if let Some(trait_def) = find_node_at_offset::<ast::TraitDef>(syntax, position.offset) {
        return Some(RangeInfo::new(
            trait_def.syntax().range(),
            impls_for_trait(db, trait_def, module)?,
        ));
    }

    None
}

fn impls_for_def(
    db: &RootDatabase,
    node: &ast::NominalDef,
    module: hir::Module,
) -> Option<Vec<NavigationTarget>> {
    let ty = match node.kind() {
        ast::NominalDefKind::StructDef(def) => {
            source_binder::struct_from_module(db, module, &def).ty(db)
        }
        ast::NominalDefKind::EnumDef(def) => {
            source_binder::enum_from_module(db, module, &def).ty(db)
        }
    };

    let krate = module.krate(db)?;
    let impls = db.impls_in_crate(krate);

    Some(
        impls
            .lookup_impl_blocks(&ty)
            .map(|imp| NavigationTarget::from_impl_block(db, imp))
            .collect(),
    )
}

fn impls_for_trait(
    db: &RootDatabase,
    node: &ast::TraitDef,
    module: hir::Module,
) -> Option<Vec<NavigationTarget>> {
    let tr = source_binder::trait_from_module(db, module, node);

    let krate = module.krate(db)?;
    let impls = db.impls_in_crate(krate);

    Some(
        impls
            .lookup_impl_blocks_for_trait(&tr)
            .map(|imp| NavigationTarget::from_impl_block(db, imp))
            .collect(),
    )
}

#[cfg(test)]
mod tests {
    use crate::mock_analysis::analysis_and_position;

    fn check_goto(fixture: &str, expected: &[&str]) {
        let (analysis, pos) = analysis_and_position(fixture);

        let mut navs = analysis.goto_implementation(pos).unwrap().unwrap().info;
        assert_eq!(navs.len(), expected.len());
        navs.sort_by_key(|nav| (nav.file_id(), nav.full_range().start()));
        navs.into_iter().enumerate().for_each(|(i, nav)| nav.assert_match(expected[i]));
    }

    #[test]
    fn goto_implementation_works() {
        check_goto(
            "
            //- /lib.rs
            struct Foo<|>;
            impl Foo {}
            ",
            &["impl IMPL_BLOCK FileId(1) [12; 23)"],
        );
    }

    #[test]
    fn goto_implementation_works_multiple_blocks() {
        check_goto(
            "
            //- /lib.rs
            struct Foo<|>;
            impl Foo {}
            impl Foo {}
            ",
            &["impl IMPL_BLOCK FileId(1) [12; 23)", "impl IMPL_BLOCK FileId(1) [24; 35)"],
        );
    }

    #[test]
    fn goto_implementation_works_multiple_mods() {
        check_goto(
            "
            //- /lib.rs
            struct Foo<|>;
            mod a {
                impl super::Foo {}
            }
            mod b {
                impl super::Foo {}
            }
            ",
            &["impl IMPL_BLOCK FileId(1) [24; 42)", "impl IMPL_BLOCK FileId(1) [57; 75)"],
        );
    }

    #[test]
    fn goto_implementation_works_multiple_files() {
        check_goto(
            "
            //- /lib.rs
            struct Foo<|>;
            mod a;
            mod b;
            //- /a.rs
            impl crate::Foo {}
            //- /b.rs
            impl crate::Foo {}
            ",
            &["impl IMPL_BLOCK FileId(2) [0; 18)", "impl IMPL_BLOCK FileId(3) [0; 18)"],
        );
    }

    #[test]
    fn goto_implementation_for_trait() {
        check_goto(
            "
            //- /lib.rs
            trait T<|> {}
            struct Foo;
            impl T for Foo {}
            ",
            &["impl IMPL_BLOCK FileId(1) [23; 40)"],
        );
    }

    #[test]
    fn goto_implementation_for_trait_multiple_files() {
        check_goto(
            "
            //- /lib.rs
            trait T<|> {};
            struct Foo;
            mod a;
            mod b;
            //- /a.rs
            impl crate::T for crate::Foo {}
            //- /b.rs
            impl crate::T for crate::Foo {}
            ",
            &["impl IMPL_BLOCK FileId(2) [0; 31)", "impl IMPL_BLOCK FileId(3) [0; 31)"],
        );
    }
}