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

use crate::error::GeozeroError;
use std::io;

/// GPX geometry collection
pub struct Gpx<'a>(pub &'a str);

impl<'a> crate::GeozeroGeometry for Gpx<'a> {
    fn process_geom<P: crate::GeomProcessor>(&self, processor: &mut P) -> crate::error::Result<()> {
        read_gpx(&mut self.0.as_bytes(), processor)
    }
}

/// GPX reader
pub struct GpxReader<R: io::Read>(pub R);

impl<R: io::Read> crate::GeozeroDatasource for GpxReader<R> {
    fn process<P: crate::FeatureProcessor>(
        &mut self,
        processor: &mut P,
    ) -> crate::error::Result<()> {
        read_gpx(&mut self.0, processor)
    }
}

pub fn read_gpx<R: io::Read, P: crate::GeomProcessor>(
    reader: &mut R,
    processor: &mut P,
) -> crate::error::Result<()> {
    let gpx_reader = match gpx::read(reader) {
        Ok(r) => r,
        Err(e) => return Err(GeozeroError::Geometry(e.to_string())),
    };

    let mut index = 0;
    let size = gpx_reader.waypoints.len() + gpx_reader.tracks.len() + gpx_reader.routes.len();

    processor.geometrycollection_begin(size, 0)?;
    process_top_level_waypoints(&gpx_reader, processor, &mut index)?;
    process_top_level_tracks(&gpx_reader, processor, &mut index)?;
    process_top_level_routes(&gpx_reader, processor, &mut index)?;
    processor.geometrycollection_end(0)
}

fn process_top_level_waypoints<P: crate::GeomProcessor>(
    gpx_reader: &gpx::Gpx,
    processor: &mut P,
    index: &mut usize,
) -> crate::error::Result<()> {
    if gpx_reader.waypoints.is_empty() {
        return Ok(());
    }
    process_waypoints_iter(gpx_reader.waypoints.iter(), processor, index, true)?;
    Ok(())
}

fn process_top_level_tracks<P: crate::GeomProcessor>(
    gpx_reader: &gpx::Gpx,
    processor: &mut P,
    index: &mut usize,
) -> crate::error::Result<()> {
    for track in &gpx_reader.tracks {
        process_track_segments(track, processor, *index)?;
        *index += 1;
    }
    Ok(())
}

fn process_track_segments<P: crate::GeomProcessor>(
    track: &gpx::Track,
    processor: &mut P,
    index: usize,
) -> crate::error::Result<()> {
    if track.segments.is_empty() {
        return Ok(());
    }
    processor.multilinestring_begin(track.segments.len(), index)?;
    for (inner_index, segment) in track.segments.iter().enumerate() {
        process_track_segment(segment, processor, inner_index)?;
    }
    processor.multilinestring_end(index)?;
    Ok(())
}

fn process_track_segment<P: crate::GeomProcessor>(
    segment: &gpx::TrackSegment,
    processor: &mut P,
    index: usize,
) -> crate::error::Result<()> {
    if segment.points.is_empty() {
        return Ok(());
    }
    processor.linestring_begin(false, segment.points.len(), index)?;
    process_waypoints_iter(segment.points.iter(), processor, &mut 0, false)?;
    processor.linestring_end(false, index)?;
    Ok(())
}

fn process_top_level_routes<P: crate::GeomProcessor>(
    gpx_reader: &gpx::Gpx,
    processor: &mut P,
    index: &mut usize,
) -> crate::error::Result<()> {
    if gpx_reader.routes.is_empty() {
        return Ok(());
    }
    processor.multilinestring_begin(gpx_reader.routes.len(), *index)?;
    for (inner_index, route) in gpx_reader.routes.iter().enumerate() {
        process_route(route, processor, inner_index)?;
    }
    processor.multilinestring_end(*index)?;
    *index += 1;
    Ok(())
}

fn process_route<P: crate::GeomProcessor>(
    route: &gpx::Route,
    processor: &mut P,
    index: usize,
) -> crate::error::Result<()> {
    if route.points.is_empty() {
        return Ok(());
    }
    processor.linestring_begin(false, route.points.len(), index)?;
    process_waypoints_iter(route.points.iter(), processor, &mut 0, false)?;
    processor.linestring_end(false, index)
}

fn process_waypoints_iter<'a, P: crate::GeomProcessor>(
    iter: impl Iterator<Item = &'a gpx::Waypoint>,
    processor: &mut P,
    index: &mut usize,
    wrap_point: bool,
) -> crate::error::Result<()> {
    for waypoint in iter {
        let point = waypoint.point();
        if wrap_point {
            processor.point_begin(*index)?;
            processor.xy(point.x(), point.y(), 0)?;
            processor.point_end(*index)?;
        } else {
            processor.xy(point.x(), point.y(), *index)?;
        }
        *index += 1;
    }
    Ok(())
}