sview 0.1.3

Agent-friendly structure views of source and document files
Documentation 
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

use crate::{
    model::Node,
    tree::{ast_preview, build_tree, collect_items, parse, FlatItem},
};
use tree_sitter::Node as AstNode;

pub(crate) fn analyze_objc(source: &str, preview_len: usize) -> Vec<Node> {
    let Some(tree) = parse(tree_sitter_objc::LANGUAGE.into(), source) else {
        return Vec::new();
    };

    let mut items = Vec::<FlatItem>::new();
    collect_items(tree.root_node(), None, &mut items, &|ast_node| {
        objc_node_from_ast(ast_node, source, preview_len)
    });
    build_tree(&items, None)
}

fn objc_node_from_ast(ast_node: AstNode, source: &str, preview_len: usize) -> Option<Node> {
    let (kind, name) = match ast_node.kind() {
        "preproc_include" => ("import", objc_include_name(ast_node, source)?),
        "class_interface" => ("interface", objc_first_identifier(ast_node, source)?),
        "class_implementation" => ("implementation", objc_first_identifier(ast_node, source)?),
        "category_interface" => ("category", objc_category_name(ast_node, source)?),
        "category_implementation" => ("category", objc_category_name(ast_node, source)?),
        "protocol_declaration" => ("protocol", objc_first_identifier(ast_node, source)?),
        "property_declaration" => ("property", objc_property_name(ast_node, source)?),
        "method_declaration" | "method_definition" => {
            ("method", objc_method_name(ast_node, source)?)
        }
        _ => return None,
    };

    let (start_line, end_line) = line_range(ast_node, source);

    Some(Node {
        kind: kind.to_string(),
        level: None,
        name: Some(name),
        start_line,
        end_line,
        preview: ast_preview(ast_node, source, preview_len),
        children: Vec::new(),
    })
}

fn line_range(ast_node: AstNode, source: &str) -> (usize, usize) {
    let start = ast_node.start_position();
    let end = ast_node.end_position();
    let mut end_line = if end.column == 0 && end.row > start.row {
        end.row
    } else {
        end.row + 1
    };
    let start_line = start.row + 1;
    let lines = source.lines().collect::<Vec<_>>();
    while end_line > start_line
        && lines
            .get(end_line.saturating_sub(1))
            .is_some_and(|line| line.trim().is_empty())
    {
        end_line -= 1;
    }
    (start_line, end_line)
}

fn objc_include_name(ast_node: AstNode, source: &str) -> Option<String> {
    ast_node
        .child_by_field_name("path")
        .and_then(|node| node.utf8_text(source.as_bytes()).ok())
        .map(ToString::to_string)
}

fn objc_first_identifier(ast_node: AstNode, source: &str) -> Option<String> {
    let mut cursor = ast_node.walk();
    let name = ast_node
        .named_children(&mut cursor)
        .find(|child| child.kind() == "identifier")
        .and_then(|node| node.utf8_text(source.as_bytes()).ok())
        .map(ToString::to_string);
    name
}

fn objc_category_name(ast_node: AstNode, source: &str) -> Option<String> {
    let mut cursor = ast_node.walk();
    let identifiers = ast_node
        .named_children(&mut cursor)
        .filter(|child| child.kind() == "identifier")
        .filter_map(|node| node.utf8_text(source.as_bytes()).ok())
        .take(2)
        .collect::<Vec<_>>();
    match identifiers.as_slice() {
        [class_name, category_name] => Some(format!("{class_name}({category_name})")),
        [class_name] => Some((*class_name).to_string()),
        _ => None,
    }
}

fn objc_property_name(ast_node: AstNode, source: &str) -> Option<String> {
    let mut cursor = ast_node.walk();
    let name = ast_node
        .named_children(&mut cursor)
        .find(|child| child.kind() == "struct_declaration")
        .and_then(|node| objc_declarator_identifier(node, source));
    name
}

fn objc_method_name(ast_node: AstNode, source: &str) -> Option<String> {
    let mut cursor = ast_node.walk();
    let parts = ast_node
        .named_children(&mut cursor)
        .filter(|child| child.kind() == "identifier")
        .filter_map(|node| node.utf8_text(source.as_bytes()).ok())
        .collect::<Vec<_>>();
    let first = parts.first()?;
    if ast_node
        .named_children(&mut ast_node.walk())
        .any(|child| child.kind() == "method_parameter")
    {
        Some(format!("{first}:"))
    } else {
        Some((*first).to_string())
    }
}

fn objc_declarator_identifier(ast_node: AstNode, source: &str) -> Option<String> {
    if ast_node.kind() == "identifier" {
        return ast_node
            .utf8_text(source.as_bytes())
            .ok()
            .map(ToString::to_string);
    }

    if let Some(declarator) = ast_node.child_by_field_name("declarator") {
        return objc_declarator_identifier(declarator, source);
    }

    let mut cursor = ast_node.walk();
    let name = ast_node
        .named_children(&mut cursor)
        .find_map(|child| objc_declarator_identifier(child, source));
    name
}