40 lines
1.1 KiB
Elm
40 lines
1.1 KiB
Elm
module Track exposing (Track, Point, parse)
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import Result
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import Xml.Decode as XD exposing (path, list, single, floatAttr, stringAttr)
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import Time
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import Iso8601
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type alias Position = (Float, Float, Maybe Float) -- lat, lon, ele
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type alias Point =
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{ loc : Position
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, time : Maybe Time.Posix
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, power : Maybe Int
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}
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type alias Track = List Point
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timeDecoder : XD.Decoder Time.Posix
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timeDecoder = XD.andThen (\ts ->
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case Iso8601.toTime ts of
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Result.Ok time -> XD.succeed time
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Result.Err f -> XD.fail "err"
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)
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XD.string
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triple x y z = (x,y,z)
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pointDecoder = XD.map3 Point
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(XD.map3 triple (floatAttr "lat") (floatAttr "lon")
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(XD.maybe (path ["ele"] (single XD.float))))
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(XD.maybe (path ["time"] (single timeDecoder)))
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(XD.maybe (path ["extensions", "gpxtpx:TrackPointExtension", "pwr:PowerInWatts"] (single XD.int)))
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gpxDecoder =
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(path [ "trk", "trkseg", "trkpt" ] (list pointDecoder))
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parse str = XD.run gpxDecoder str
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