aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_editor/src/structure.rs
blob: 8bd57555f513394c0cd73a44af893ff8e306e77b (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
use crate::TextRange;

use ra_syntax::{
    algo::visit::{visitor, Visitor},
    ast::{self, NameOwner},
    AstNode, SourceFile, SyntaxKind, SyntaxNode, WalkEvent,
};

#[derive(Debug, Clone)]
pub struct StructureNode {
    pub parent: Option<usize>,
    pub label: String,
    pub navigation_range: TextRange,
    pub node_range: TextRange,
    pub kind: SyntaxKind,
}

pub fn file_structure(file: &SourceFile) -> Vec<StructureNode> {
    let mut res = Vec::new();
    let mut stack = Vec::new();

    for event in file.syntax().preorder() {
        match event {
            WalkEvent::Enter(node) => {
                if let Some(mut symbol) = structure_node(node) {
                    symbol.parent = stack.last().map(|&n| n);
                    stack.push(res.len());
                    res.push(symbol);
                }
            }
            WalkEvent::Leave(node) => {
                if structure_node(node).is_some() {
                    stack.pop().unwrap();
                }
            }
        }
    }
    res
}

fn structure_node(node: &SyntaxNode) -> Option<StructureNode> {
    fn decl<N: NameOwner>(node: &N) -> Option<StructureNode> {
        let name = node.name()?;
        Some(StructureNode {
            parent: None,
            label: name.text().to_string(),
            navigation_range: name.syntax().range(),
            node_range: node.syntax().range(),
            kind: node.syntax().kind(),
        })
    }

    visitor()
        .visit(decl::<ast::FnDef>)
        .visit(decl::<ast::StructDef>)
        .visit(decl::<ast::NamedFieldDef>)
        .visit(decl::<ast::EnumDef>)
        .visit(decl::<ast::TraitDef>)
        .visit(decl::<ast::Module>)
        .visit(decl::<ast::TypeDef>)
        .visit(decl::<ast::ConstDef>)
        .visit(decl::<ast::StaticDef>)
        .visit(|im: &ast::ImplBlock| {
            let target_type = im.target_type()?;
            let target_trait = im.target_trait();
            let label = match target_trait {
                None => format!("impl {}", target_type.syntax().text()),
                Some(t) => format!(
                    "impl {} for {}",
                    t.syntax().text(),
                    target_type.syntax().text(),
                ),
            };

            let node = StructureNode {
                parent: None,
                label,
                navigation_range: target_type.syntax().range(),
                node_range: im.syntax().range(),
                kind: im.syntax().kind(),
            };
            Some(node)
        })
        .accept(node)?
}

#[cfg(test)]
mod tests {
    use super::*;
    use test_utils::assert_eq_dbg;

    #[test]
    fn test_file_structure() {
        let file = SourceFile::parse(
            r#"
struct Foo {
    x: i32
}

mod m {
    fn bar() {}
}

enum E { X, Y(i32) }
type T = ();
static S: i32 = 92;
const C: i32 = 92;

impl E {}

impl fmt::Debug for E {}
"#,
        );
        let structure = file_structure(&file);
        assert_eq_dbg(
            r#"[StructureNode { parent: None, label: "Foo", navigation_range: [8; 11), node_range: [1; 26), kind: STRUCT_DEF },
                StructureNode { parent: Some(0), label: "x", navigation_range: [18; 19), node_range: [18; 24), kind: NAMED_FIELD_DEF },
                StructureNode { parent: None, label: "m", navigation_range: [32; 33), node_range: [28; 53), kind: MODULE },
                StructureNode { parent: Some(2), label: "bar", navigation_range: [43; 46), node_range: [40; 51), kind: FN_DEF },
                StructureNode { parent: None, label: "E", navigation_range: [60; 61), node_range: [55; 75), kind: ENUM_DEF },
                StructureNode { parent: None, label: "T", navigation_range: [81; 82), node_range: [76; 88), kind: TYPE_DEF },
                StructureNode { parent: None, label: "S", navigation_range: [96; 97), node_range: [89; 108), kind: STATIC_DEF },
                StructureNode { parent: None, label: "C", navigation_range: [115; 116), node_range: [109; 127), kind: CONST_DEF },
                StructureNode { parent: None, label: "impl E", navigation_range: [134; 135), node_range: [129; 138), kind: IMPL_BLOCK },
                StructureNode { parent: None, label: "impl fmt::Debug for E", navigation_range: [160; 161), node_range: [140; 164), kind: IMPL_BLOCK }]"#,
            &structure,
        )
    }
}