118 lines
3.0 KiB
Haskell
118 lines
3.0 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Track (
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Track,
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Pos(..),
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pos,
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elevation,
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cadence,
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power,
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time,
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parse,
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Track.length
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) where
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import Data.Time
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import qualified Data.Time.ISO8601
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import qualified Data.List
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import Text.XML
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import Text.XML.Cursor as Cursor
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import qualified Data.Text
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import Data.Text.Lazy as T
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import Debug.Trace (trace, traceShow)
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import Data.List as List
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import Data.Map as Map
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import Control.Exception
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data Pos = Pos Float Float deriving (Show, Eq)
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type Power = Maybe Int
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type Cadence = Maybe Int
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type HeartRate = Maybe Int
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data Point = Point {
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pos :: Pos,
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elevation :: Maybe Float,
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time :: UTCTime,
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cadence :: Cadence,
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power :: Power,
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heartRate :: HeartRate
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} deriving (Show)
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-- TODO do we even need this type?
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type Track = [Point]
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gpxNS localName =
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Name localName (Just "http://www.topografix.com/GPX/1/1") Nothing
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tpxNS localName =
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Name localName (Just "http://www.garmin.com/xmlschemas/TrackPointExtension/v2") Nothing
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mkPoint pos =
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Point
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pos
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Nothing
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(UTCTime (toEnum 60631) 43200)
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Nothing
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Nothing
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Nothing
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elToPoint :: Cursor -> Point
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elToPoint c =
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case node c of
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NodeElement (Element _ attrs _) ->
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let
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lat = getAttr "lat"
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lon = getAttr "lon"
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ele = child c >>= element (gpxNS "ele") >>= child >>= content
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ts = child c >>= element (gpxNS "time") >>= child >>= content
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gpxtpx = child c >>=
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element (gpxNS "extensions")
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>>= child
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>>= element (tpxNS "TrackPointExtension") >>= child
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cadence = gpxtpx >>= element (tpxNS "cad")
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>>= child >>= content
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power = gpxtpx >>= element (Name "PowerInWatts" (Just "http://www.garmin.com/xmlschemas/PowerExtension/v1") Nothing)
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>>= child >>= content
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in Point (Pos lat lon)
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(case ele of
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[e] -> Just $ asFloat e
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_ -> Nothing)
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(case ts of
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[e] -> case Data.Time.ISO8601.parseISO8601 (Data.Text.unpack e) of
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Just utime -> utime
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_ -> UTCTime (toEnum 0) 0
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_ -> UTCTime (toEnum 0) 0)
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(case cadence of
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[e] -> Just (asInt e)
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_ -> Nothing)
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(case power of
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[e] -> Just (asInt e)
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_ -> Nothing)
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Nothing
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where
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asFloat v = (read (Data.Text.unpack v) :: Float)
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asInt v = (read (Data.Text.unpack v) :: Int)
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getAttr name =
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case Map.lookup name attrs of
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Just v -> asFloat v
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_ -> 0
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_ -> mkPoint (Pos 0 0)
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getPoints :: Cursor -> [Point]
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getPoints c =
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let
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trkpts =
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element (gpxNS "gpx") c >>= child >>=
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element (gpxNS "trk") >>= descendant >>=
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element (gpxNS "trkpt")
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in
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List.map elToPoint trkpts
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parse :: String -> Either SomeException [Point]
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parse str = do
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gpx <- parseText def (T.pack str)
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return (getPoints (fromDocument gpx))
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length :: Track -> Int
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length = Data.List.length
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