eilmeldung 1.4.3

a feature-rich TUI RSS Reader based on the news-flash library
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
144

use crate::prelude::*;
use logos::Logos;
use ratatui::layout::Constraint;
use std::str::FromStr;

#[derive(Debug, Clone)]
pub enum Dimension {
    Length(u16),
    Percentage(u16),
}

#[derive(logos::Logos)]
#[logos(skip r"[ \t\n\f]+")]
enum DimensionToken {
    #[token("%")]
    UnitPercent,

    #[regex("length")]
    UnitLength,

    #[regex("[0-9]+")]
    Number,
}

impl FromStr for Dimension {
    type Err = ConfigError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let mut lexer = DimensionToken::lexer(s);
        use DimensionToken as T;

        let Some(Ok(T::Number)) = lexer.next() else {
            return Err(ConfigError::DimensionParseError(
                "expected number".to_owned(),
            ));
        };

        let number = lexer.slice().parse::<u16>().map_err(|_| {
            ConfigError::DimensionParseError("unable to parse number (too large?)".to_owned())
        })?;

        let dimension = match lexer.next() {
            Some(Ok(T::UnitLength)) => Ok(Dimension::Length(number)),
            Some(Ok(T::UnitPercent)) => {
                if number.clamp(0, 100) != number {
                    Err(ConfigError::DimensionParseError(
                        "percent value must be between 0 and 100".to_owned(),
                    ))
                } else {
                    Ok(Dimension::Percentage(number))
                }
            }
            _ => Err(ConfigError::DimensionParseError(
                "expecting unit".to_owned(),
            )),
        }?;

        if lexer.next().is_some() {
            Err(ConfigError::DimensionParseError(
                "invalid trailing characters after dimension".to_owned(),
            ))
        } else {
            Ok(dimension)
        }
    }
}

impl Dimension {
    pub fn as_constraint(&self) -> Constraint {
        use Dimension as D;
        match self {
            D::Length(length) => Constraint::Length(*length),
            D::Percentage(percent) => Constraint::Percentage(*percent),
        }
    }

    pub fn as_complementary_constraint(&self, max: u16) -> Constraint {
        use Dimension as D;
        match self {
            D::Length(length) => Constraint::Length(max.saturating_sub(*length)),
            D::Percentage(percent) => Constraint::Percentage(100u16.saturating_sub(*percent)),
        }
    }
}

impl<'de> serde::Deserialize<'de> for Dimension {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        Dimension::from_str(&s).map_err(|err| serde::de::Error::custom(err.to_string()))
    }
}

#[cfg(test)]
mod tests {

    macro_rules! dimension_tests {
        ($($name:ident: $str:literal => $val:pat,)*) => {
            $(
                #[test]
                fn $name() {
                    let mut deserializer =
                        serde_assert::Deserializer::builder([Token::Str($str.to_owned())]).build();
                    claims::assert_matches!(
                        Dimension::deserialize(&mut deserializer),
                        $val
                    );
                }

            )*
        }
    }

    use serde::Deserialize;
    use serde_assert::Token;

    use super::*;

    dimension_tests! {

        no_space_length: "10length" => Ok(Dimension::Length(10)),
        space_length: "4 length" => Ok(Dimension::Length(4)),
        multiple_spaces_length: "  19 \t length  \t" => Ok(Dimension::Length(19)),
        leading_zeros_length: "  00019 \t length  \t" => Ok(Dimension::Length(19)),
        zero_length: "0 length" => Ok(Dimension::Length(0)),

        no_space_percent: "81%" => Ok(Dimension::Percentage(81)),
        space_percent: "10 %" => Ok(Dimension::Percentage(10)),
        multiple_spaces_percent: "  9 \t %  \t" => Ok(Dimension::Percentage(9)),
        leading_zeros_percent: "  00019 \t %  \t" => Ok(Dimension::Percentage(19)),
        zero_percent: "0 %" => Ok(Dimension::Percentage(0)),
        hundred_percent: "100 %" => Ok(Dimension::Percentage(100)),

        garbage: "abc" => Err(_),
        empty: "" => Err(_),
        just_length: "length" => Err(_),
        just_percent: "percent" => Err(_),
        negative_length: "-1length" => Err(_),
        negative_percent: "-1%" => Err(_),
        too_much_percent: "101%" => Err(_),
    }
}