"""Simple converter from TCX file to GPX format

Usage:   python tcx2gpx.py   foo.tcx  > foo.gpx

Streaming implementation works for large files.


Open Source: MIT Licencse.
This is or was <http://www.w3.org/2009/09/geo/tcx2gpx.py>
Author: http://www.w3.org/People/Berners-Lee/card#i
Written: 2009-10-30
Last change: $Date: 2009/10/28 13:44:33 $
"""
import urllib
from xml import sax
from xml.sax import saxutils
import sys, os


w = sys.stdout.write

TCX_NS="http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2"


class MyHandler(sax.handler.ContentHandler):
    def __init__(self):
        self.time = ""
        self.lat = ""
        self.lon = ""
        self.alt = ""
        self.content = ""


    def startDocument(self):
        w("""<gpx xmlns="http://www.topografix.com/GPX/1/1"
    creator="http://www.w3.org/2009/09/geo/tcx2gpx.py"
    version="1.1"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
""")
 
    def endDocument(self):
        w('</gpx>\n')

    def startElement(self, name, attrs):
    
        self.content = ""
        if name == 'Track':
            w(' <trk>\n')
            

    def characters(self, content):
        self.content = self.content + saxutils.escape(content)

#    def endElementNS(fname, qname, attrs):
#        (ns, name) = fname
 
    def endElement(self, name):
        if name == 'Track':
            w(' </trk>\n')
        elif name == 'Trackpoint':
            w('  <trkpt lat="%s" lon="%s">\n' % (self.lat, self.lon))
            if (self.alt): w('   <ele>%s</ele>\n' % self.alt)
            if (self.time): w('   <time>%s</time>\n' % self.time)
            w('  </trkpt>\n')
            sys.stdout.flush()
        elif name == 'LatitudeDegrees':
            self.lat = self.content
        elif name == 'LongitudeDegrees':
            self.lon = self.content
        elif name == 'AltitudeMeters':
            self.alt = self.content
        elif name == 'Time':
            self.time = self.content


handler = MyHandler()

def read_TCX(uri):
    sax.parse(uri, handler)


read_TCX(sys.argv[1])


#ends