nmea-parser 0.11.0

NMEA 0183 parser for AIS and GNSS sentences
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

/*
Copyright 2021 Linus Eing

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

use super::*;

/// MWV - Wind speed and angle
#[derive(Clone, Debug, PartialEq, Serialize)]
pub struct MwvData {
    /// wind angle, 0 to 359 degrees
    pub wind_angle: Option<f64>,

    /// Reference, True/Relative (true = relative, false = true, None = unknown)
    pub relative: Option<bool>,

    /// Wind speed - knots
    pub wind_speed_knots: Option<f64>,

    /// Wind speed - km/h
    pub wind_speed_kmh: Option<f64>,
}

// -------------------------------------------------------------------------------------------------

/// xxMWV: Wind speed and angle

pub(crate) fn handle(sentence: &str) -> Result<ParsedMessage, ParseError> {
    let split: Vec<&str> = sentence.split(',').collect();

    Ok(ParsedMessage::Mwv(MwvData {
        wind_angle: pick_number_field(&split, 1)?,
        relative: match pick_string_field(&split, 2)
            .ok_or(ParseError::CorruptedSentence(
                "pick string for \"relative\" was None".to_string(),
            ))?
            .as_str()
        {
            "R" => Some(true),
            "T" => Some(false),
            _ => None,
        },
        wind_speed_knots: match pick_string_field(&split, 4)
            .ok_or(ParseError::CorruptedSentence(
                "pick string for \"wind_speed_knots\" was None".to_string(),
            ))?
            .as_str()
        {
            "N" => pick_number_field(&split, 3)?,
            "M" => Some(
                pick_number_field::<f64>(&split, 3)?.ok_or(ParseError::CorruptedSentence(
                    "pick string for \"wind_speed_knots M\" was None".to_string(),
                ))? * 1.943844,
            ),
            "K" => Some(
                pick_number_field::<f64>(&split, 3)?.ok_or(ParseError::CorruptedSentence(
                    "pick string for \"wind_speed_knots K\" was None".to_string(),
                ))? * 0.539957,
            ),
            _ => None,
        },
        wind_speed_kmh: match pick_string_field(&split, 4)
            .ok_or(ParseError::CorruptedSentence(
                "pick string for \"wind_speed_kmh\" was None".to_string(),
            ))?
            .as_str()
        {
            "N" => Some(
                pick_number_field::<f64>(&split, 3)?.ok_or(ParseError::CorruptedSentence(
                    "pick string for \"wind_speed_kmh N\" was None".to_string(),
                ))? * 1.852,
            ),
            "M" => Some(
                pick_number_field::<f64>(&split, 3)?.ok_or(ParseError::CorruptedSentence(
                    "pick string for \"wind_speed_kmh M\" was None".to_string(),
                ))? * 3.6,
            ),
            "K" => pick_number_field(&split, 3)?,
            _ => None,
        },
    }))
}

// -------------------------------------------------------------------------------------------------

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

    #[test]
    fn test_parse_mwv() {
        match NmeaParser::new().parse_sentence("$WIMWV,295.4,T,33.3,N,A*1C") {
            Ok(ps) => match ps {
                ParsedMessage::Mwv(mwv) => {
                    assert_eq!(mwv.wind_angle, Some(295.4));
                    assert_eq!(mwv.relative, Some(false));
                    assert_eq!(mwv.wind_speed_knots, Some(33.3));
                    assert_eq!(mwv.wind_speed_kmh, Some(33.3 * 1.852));
                }
                _ => {
                    assert!(false);
                }
            },
            Err(e) => {
                assert_eq!(e.to_string(), "OK");
            }
        }
    }
}