tailspin 7.0.0

A log file highlighter
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

use super::build_regex;
use memchr::memchr;
use regex::Regex;

use crate::core::config::KeyValueConfig;

use super::super::palette::{Palette, StyleId};
use super::super::span::{Collector, Finder};

#[derive(Debug, Clone)]
pub(crate) struct KeyValueFinder {
    regex: Regex,
    key: StyleId,
    separator: StyleId,
}

impl KeyValueFinder {
    pub fn new(config: KeyValueConfig, palette: &mut Palette) -> Self {
        // The (?:^|\s) anchor is zero-width at start-of-string or consumes one
        // whitespace byte. We use find_iter and skip that leading byte manually.
        let pattern = r"(?:^|\s)\w+\b=";
        let regex = build_regex(pattern);

        Self {
            regex,
            key: palette.intern(config.key),
            separator: palette.intern(config.separator),
        }
    }
}

impl Finder for KeyValueFinder {
    fn find_spans(&self, input: &str, collector: &mut Collector) {
        if memchr(b'=', input.as_bytes()).is_none() {
            return;
        }

        for m in self.regex.find_iter(input) {
            let bytes = m.as_str().as_bytes();
            let skip = usize::from(bytes[0].is_ascii_whitespace());
            let s = m.start() + skip;

            // Match structure (after skip): key=
            collector.push(s, m.end() - 1, self.key);
            collector.push(m.end() - 1, m.end(), self.separator);
        }
    }
}

#[cfg(test)]
mod tests {
    use super::super::span_texts;
    use super::*;
    use crate::style::{Color, Style};

    fn make_finder() -> KeyValueFinder {
        KeyValueFinder::new(
            KeyValueConfig {
                key: Style::new().fg(Color::Red),
                separator: Style::new().fg(Color::Yellow),
            },
            &mut Palette::new(),
        )
    }

    #[test]
    fn basic_key_value() {
        let texts = span_texts("Entry key=value", &make_finder());
        assert_eq!(texts, ["key", "="]);
    }

    #[test]
    fn multiple_key_values() {
        let texts = span_texts("host=localhost port=8080", &make_finder());
        assert_eq!(texts, ["host", "=", "port", "="]);
    }

    #[test]
    fn key_value_at_start_of_line() {
        let texts = span_texts("key=value", &make_finder());
        assert_eq!(texts, ["key", "="]);
    }

    #[test]
    fn no_key_value_no_match() {
        assert!(span_texts("No numbers here!", &make_finder()).is_empty());
    }
}