rumdl 0.0.12

A fast Markdown linter written in Rust (Ru(st) MarkDown Linter)
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

use crate::rule::{Fix, LintError, LintResult, LintWarning, Rule};
use regex::Regex;
use lazy_static::lazy_static;

lazy_static! {
    static ref UNDERSCORE_PATTERN: Regex = Regex::new(r"__[^_\\]+__").unwrap();
    static ref ASTERISK_PATTERN: Regex = Regex::new(r"\*\*[^*\\]+\*\*").unwrap();
}

/// Rule MD050: Strong emphasis style should be consistent
pub struct MD050StrongStyle {
    style: StrongStyle,
}

#[derive(Debug, Clone, PartialEq)]
pub enum StrongStyle {
    Asterisk,
    Underscore,
    Consistent,
}

impl MD050StrongStyle {
    pub fn new(style: StrongStyle) -> Self {
        Self { style }
    }

    fn detect_style(&self, content: &str) -> Option<StrongStyle> {
        let asterisk_count = content.matches("**").count();
        let underscore_count = content.matches("__").count();

        if asterisk_count > underscore_count {
            Some(StrongStyle::Asterisk)
        } else if underscore_count > asterisk_count {
            Some(StrongStyle::Underscore)
        } else {
            None
        }
    }

    fn is_escaped(&self, text: &str, pos: usize) -> bool {
        if pos == 0 {
            return false;
        }
        let mut backslash_count = 0;
        for c in text[..pos].chars().rev() {
            if c == '\\' {
                backslash_count += 1;
            } else {
                break;
            }
        }
        backslash_count % 2 == 1
    }
}

impl Rule for MD050StrongStyle {
    fn name(&self) -> &'static str {
        "MD050"
    }

    fn description(&self) -> &'static str {
        "Strong emphasis style should be consistent"
    }

    fn check(&self, content: &str) -> LintResult {
        let mut warnings = Vec::new();
        let target_style = match self.style {
            StrongStyle::Consistent => self.detect_style(content).unwrap_or(StrongStyle::Asterisk),
            _ => self.style.clone(),
        };

        let strong_regex = match target_style {
            StrongStyle::Asterisk => &*UNDERSCORE_PATTERN,
            StrongStyle::Underscore => &*ASTERISK_PATTERN,
            StrongStyle::Consistent => unreachable!(),
        };

        for (line_num, line) in content.lines().enumerate() {
            for m in strong_regex.find_iter(line) {
                if !self.is_escaped(line, m.start()) {
                    let text = &line[m.start()+2..m.end()-2];
                    let message = match target_style {
                        StrongStyle::Asterisk => "Strong emphasis should use asterisks",
                        StrongStyle::Underscore => "Strong emphasis should use underscores",
                        StrongStyle::Consistent => unreachable!(),
                    };

                    warnings.push(LintWarning {
                        line: line_num + 1,
                        column: m.start() + 1,
                        message: message.to_string(),
                        fix: Some(Fix {
                            line: line_num + 1,
                            column: m.start() + 1,
                            replacement: match target_style {
                                StrongStyle::Asterisk => format!("**{}**", text),
                                StrongStyle::Underscore => format!("__{}__", text),
                                StrongStyle::Consistent => unreachable!(),
                            },
                        }),
                    });
                }
            }
        }

        Ok(warnings)
    }

    fn fix(&self, content: &str) -> Result<String, LintError> {
        let target_style = match self.style {
            StrongStyle::Consistent => self.detect_style(content).unwrap_or(StrongStyle::Asterisk),
            _ => self.style.clone(),
        };

        let strong_regex = match target_style {
            StrongStyle::Asterisk => &*UNDERSCORE_PATTERN,
            StrongStyle::Underscore => &*ASTERISK_PATTERN,
            StrongStyle::Consistent => unreachable!(),
        };

        // Store matches with their positions
        let matches: Vec<(usize, usize)> = strong_regex.find_iter(content)
            .filter(|m| !self.is_escaped(content, m.start()))
            .map(|m| (m.start(), m.end()))
            .collect();

        // Process matches in reverse order to maintain correct indices
        let mut result = content.to_string();
        for (start, end) in matches.into_iter().rev() {
            let text = &result[start+2..end-2];
            let replacement = match target_style {
                StrongStyle::Asterisk => format!("**{}**", text),
                StrongStyle::Underscore => format!("__{}__", text),
                StrongStyle::Consistent => unreachable!(),
            };
            result.replace_range(start..end, &replacement);
        }

        Ok(result)
    }
}