metar 0.9.3

A fast METAR parsing library in pure Rust
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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234

use chumsky::prelude::*;

use crate::{traits::Parsable, Data, MetarError};

/// The wind speed
#[derive(PartialEq, Eq, Copy, Clone, Debug, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum WindSpeed {
    /// Nautical miles per hour
    Knots {
        /// The wind speed
        speed: Data<u32>,
        /// The wind gusts speed
        gusting: Option<Data<u32>>,
    },
    /// Metres per second
    MetresPerSecond {
        /// The wind speed
        speed: Data<u32>,
        /// The wind gusts speed
        gusting: Option<Data<u32>>,
    },
    /// Kilometres per hour
    KilometresPerHour {
        /// The wind speed
        speed: Data<u32>,
        /// The wind gusts speed
        gusting: Option<Data<u32>>,
    },
    /// Wind speed is greater than 100 knots, 100 m/s or 200 kph
    Greater,
}

impl Parsable for WindSpeed {
    fn parser<'src>() -> impl chumsky::Parser<'src, &'src str, Self, extra::Err<MetarError<'src>>> {
        choice((
            // Greater than speeds
            just("P99KT").map(|_| WindSpeed::Greater),
            just("P99MPS").map(|_| WindSpeed::Greater),
            just("P199KPH").map(|_| WindSpeed::Greater),
            // Knots
            just("//KT").map(|_| WindSpeed::Knots {
                speed: Data::Unknown,
                gusting: None,
            }),
            group((
                text::digits(10).exactly(2).to_slice(),
                choice((
                    just("G//").map(|_| Some(Data::Unknown)),
                    just("G")
                        .then(text::digits(10).exactly(2).to_slice())
                        .map(|(_, gust): (&str, &str)| Some(Data::Known(gust.parse().unwrap()))),
                    empty().map(|()| None),
                )),
                just("KT"),
            ))
            .map(|(spd, gusting, _): (&str, Option<Data<u32>>, &str)| {
                WindSpeed::Knots {
                    speed: Data::Known(spd.parse().unwrap()),
                    gusting,
                }
            }),
            // MPS
            just("//MPS").map(|_| WindSpeed::MetresPerSecond {
                speed: Data::Unknown,
                gusting: None,
            }),
            group((
                text::digits(10).exactly(2).to_slice(),
                choice((
                    just("G//").map(|_| Some(Data::Unknown)),
                    just("G")
                        .then(text::digits(10).exactly(2).to_slice())
                        .map(|(_, gust): (&str, &str)| Some(Data::Known(gust.parse().unwrap()))),
                    empty().map(|()| None),
                )),
                just("MPS"),
            ))
            .map(|(spd, gusting, _): (&str, Option<Data<u32>>, &str)| {
                WindSpeed::MetresPerSecond {
                    speed: Data::Known(spd.parse().unwrap()),
                    gusting,
                }
            }),
            // KPH
            just("//KPH").map(|_| WindSpeed::KilometresPerHour {
                speed: Data::Unknown,
                gusting: None,
            }),
            group((
                text::digits(10).exactly(3).to_slice(),
                choice((
                    just("G//").map(|_| Some(Data::Unknown)),
                    just("G")
                        .then(text::digits(10).exactly(3).to_slice())
                        .map(|(_, gust): (&str, &str)| Some(Data::Known(gust.parse().unwrap()))),
                    empty().map(|()| None),
                )),
                just("KPH"),
            ))
            .map(|(spd, gusting, _): (&str, Option<Data<u32>>, &str)| {
                WindSpeed::KilometresPerHour {
                    speed: Data::Known(spd.parse().unwrap()),
                    gusting,
                }
            }),
        ))
    }
}

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

    #[test]
    fn valid_kts() {
        assert_eq!(
            WindSpeed::parse("//KT").unwrap(),
            WindSpeed::Knots {
                speed: Data::Unknown,
                gusting: None
            }
        );
        assert_eq!(
            WindSpeed::parse("00KT").unwrap(),
            WindSpeed::Knots {
                speed: Data::Known(0),
                gusting: None
            }
        );
        assert_eq!(
            WindSpeed::parse("40G60KT").unwrap(),
            WindSpeed::Knots {
                speed: Data::Known(40),
                gusting: Some(Data::Known(60))
            }
        );
        assert_eq!(
            WindSpeed::parse("40G//KT").unwrap(),
            WindSpeed::Knots {
                speed: Data::Known(40),
                gusting: Some(Data::Unknown)
            }
        );
        assert_eq!(
            WindSpeed::parse("99KT").unwrap(),
            WindSpeed::Knots {
                speed: Data::Known(99),
                gusting: None
            }
        );
        assert_eq!(WindSpeed::parse("P99KT").unwrap(), WindSpeed::Greater);
    }

    #[test]
    fn valid_mps() {
        assert_eq!(
            WindSpeed::parse("//MPS").unwrap(),
            WindSpeed::MetresPerSecond {
                speed: Data::Unknown,
                gusting: None
            }
        );
        assert_eq!(
            WindSpeed::parse("00MPS").unwrap(),
            WindSpeed::MetresPerSecond {
                speed: Data::Known(0),
                gusting: None
            }
        );
        assert_eq!(
            WindSpeed::parse("40G60MPS").unwrap(),
            WindSpeed::MetresPerSecond {
                speed: Data::Known(40),
                gusting: Some(Data::Known(60))
            }
        );
        assert_eq!(
            WindSpeed::parse("40G//MPS").unwrap(),
            WindSpeed::MetresPerSecond {
                speed: Data::Known(40),
                gusting: Some(Data::Unknown)
            }
        );
        assert_eq!(
            WindSpeed::parse("99MPS").unwrap(),
            WindSpeed::MetresPerSecond {
                speed: Data::Known(99),
                gusting: None
            }
        );
        assert_eq!(WindSpeed::parse("P99MPS").unwrap(), WindSpeed::Greater);
    }

    #[test]
    fn valid_kph() {
        assert_eq!(
            WindSpeed::parse("//KPH").unwrap(),
            WindSpeed::KilometresPerHour {
                speed: Data::Unknown,
                gusting: None
            }
        );
        assert_eq!(
            WindSpeed::parse("000KPH").unwrap(),
            WindSpeed::KilometresPerHour {
                speed: Data::Known(0),
                gusting: None
            }
        );
        assert_eq!(
            WindSpeed::parse("040G060KPH").unwrap(),
            WindSpeed::KilometresPerHour {
                speed: Data::Known(40),
                gusting: Some(Data::Known(60))
            }
        );
        assert_eq!(
            WindSpeed::parse("040G//KPH").unwrap(),
            WindSpeed::KilometresPerHour {
                speed: Data::Known(40),
                gusting: Some(Data::Unknown)
            }
        );
        assert_eq!(
            WindSpeed::parse("199KPH").unwrap(),
            WindSpeed::KilometresPerHour {
                speed: Data::Known(199),
                gusting: None
            }
        );
        assert_eq!(WindSpeed::parse("P199KPH").unwrap(), WindSpeed::Greater);
    }
}