swt 5.0.0-rc.9

🍬 Sweet: A blazing-fast code health and architecture analyzer.
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

mod handlers;
mod utils;

use crate::languages::LanguageRegistry;
use handlers::{handle_block_comment_end, handle_comment_start, try_handle_jsx_comment};
use utils::normalize_whitespace;

#[must_use]
pub fn remove_comments(content: &str, extension: &str, aggressive: bool) -> String {
    let registry = LanguageRegistry::get();
    let Some(lang) = registry.get_by_extension(extension) else {
        return content.to_string();
    };

    let mut result = String::with_capacity(content.len());
    let mut chars = content.chars();
    let line_prefix = lang.line_comment();
    let block_delimiters = lang.block_comment();

    let mut in_string = false;
    let mut string_char = '\"';
    let mut in_block_comment = false;
    let mut in_line_comment = false;

    while let Some(current) = chars.next() {
        if in_string {
            result.push(current);
            if current == '\\' {
                if let Some(escaped) = chars.next() {
                    result.push(escaped);
                }
            } else if current == string_char {
                in_string = false;
            }
            continue;
        }

        if in_block_comment {
            if handle_block_comment_end(
                &mut chars,
                &mut result,
                &mut in_block_comment,
                block_delimiters,
                current,
                extension,
            ) {
                continue;
            }
            continue;
        }

        if in_line_comment {
            if current == '\n' {
                in_line_comment = false;
                result.push('\n');
            }
            continue;
        }

        if current == '\"' || current == '\'' || current == '`' {
            in_string = true;
            string_char = current;
            result.push(current);
            continue;
        }

        if (extension == "jsx" || extension == "tsx")
            && current == '{'
            && try_handle_jsx_comment(&mut chars, &mut in_block_comment)
        {
            continue;
        }

        if handle_comment_start(
            &mut chars,
            &mut in_block_comment,
            &mut in_line_comment,
            block_delimiters,
            line_prefix,
            current,
            aggressive,
        ) {
            continue;
        }

        result.push(current);
    }

    normalize_whitespace(&result)
}

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

    fn check(code: &str, expected: &str, aggressive: bool) {
        assert_eq!(remove_comments(code, "rs", aggressive), expected);
    }

    #[test]
    fn test_uncommenting() {
        check(
            "fn main() {\n    // comment\n    /* block */\n    let x = 5;\n}",
            "fn main() {\n\n    let x = 5;\n}",
            true,
        );
        check("/// doc\nfn main() {}", "/// doc\nfn main() {}", false);
        check("/// doc\nfn main() {}", "fn main() {}", true);
        check(
            "let s = \"http://example.com\";",
            "let s = \"http://example.com\";",
            true,
        );
    }

    #[test]
    fn test_jsx_uncommenting() {
        assert_eq!(
            remove_comments("const el = <div>{/* comment */}</div>", "tsx", true),
            "const el = <div></div>"
        );
        assert_eq!(
            remove_comments("const el = <div>{  /* spaces */  }</div>", "tsx", true),
            "const el = <div></div>"
        );
        assert_eq!(
            remove_comments("const el = <div>{\n  /* multiline */\n}</div>", "tsx", true),
            "const el = <div></div>"
        );
    }
}