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##+##########################################################################
#
# gpx.tcl -- Parse gpx files
# by Keith Vetter, July 7, 2010
#
# gpx definition:
# http://www.topografix.com/gpx.asp
# http://www.topografix.com/GPX/1/1/
# GPX 1.0 => http://www.topografix.com/gpx_manual.asp
#
# code reference:
# http://wiki.tcl.tk/26635
# API
# set token [::gpx::Create gpxFilename]
# ::gpx::Cleanup $token
# ::gpx::GetGPXMetadata $token => dict of metadata
# ::gpx::GetWaypointCount $token => number of waypoints
# ::gpx::GetAllWaypoints $token => list of waypoint items
# ::gpx::GetTrackCount $token => number of tracks
# ::gpx::GetTrackMetadata $token $whichTrack => dict of metadata for this track
# ::gpx::GetTrackPoints $token $whichTrack => list of trkpts for this track
# ::gpx::GetRouteCount $token => number of routes
# ::gpx::GetRouteMetadata $token $whichRoute => dict of metadata for this route
# ::gpx::GetRoutePoints $token $whichRoute => list of rtepts for this route
#
# o metadata is a dictionary whose keys depends on the which optional elements
# are present and whose structure depends on the element's schema
#
# o a waypoint/trackpoint is a 3 element list consisting of latitude,
# longitude and a dictionary of metadata:
# e.g. 41.61716028 -70.61758477 {ele 35.706 time 2010-06-17T16:02:28Z}
#
package require Tcl 8.5
package require tdom
namespace eval gpx {
variable nameSpaces {
gpx "http://www.topografix.com/GPX/1/1"
xsi "http://www.w3.org/2001/XMLSchema-instance"
}
# gpx 1.0 was obsoleted August 9, 2004, but we handle it anyway
variable nameSpaces10 {
gpx "http://www.topografix.com/GPX/1/0"
topografix "http://www.topografix.com/GPX/Private/TopoGrafix/0/2"
}
variable gpx
set gpx(id) 0
# Cleanup any existing doms if we reload this module
::apply {{} {
foreach arr [array names ::gpx::gpx dom,*] {
catch {$::gpx::gpx($arr) delete}
unset ::gpx::gpx($arr)
}
}}
}
##+##########################################################################
#
# ::gpx::Create -- Creates a tdom object, returns opaque token to it
# parameters: gpxFilename
# returns: token for this tdom object
#
proc ::gpx::Create {gpxFilename {rawXML {}}} {
variable nameSpaces
variable gpx
if {$rawXML eq ""} {
set fin [open $gpxFilename r]
set rawXML [read $fin] ; list
close $fin
}
set token "gpx[incr gpx(id)]"
dom parse $rawXML gpx(dom,$token)
# Check version 1.0, 1.1 or fail
set version [[$gpx(dom,$token) documentElement] getAttribute version 0.0]
if {[package vcompare $version 1.1] >= 0} {
$gpx(dom,$token) selectNodesNamespaces $::gpx::nameSpaces
} elseif {[package vcompare $version 1.0] == 0} {
$gpx(dom,$token) selectNodesNamespaces $::gpx::nameSpaces10
} else {
$gpx(dom,$token) delete
error "$gpxFilename is version $version, need 1.0 or better"
}
set gpx(version,$token) $version
return $token
}
##+##########################################################################
#
# ::gpx::Cleanup -- Cleans up an instance of a tdom object
# parameter: token returned by ::gpx::Create
#
proc ::gpx::Cleanup {token} {
variable gpx
$gpx(dom,$token) delete
unset gpx(dom,$token)
}
##+##########################################################################
#
# ::gpx::GetGPXMetadata -- Return metadata dictionary for entire document
# parameter: token returned by ::gpx::Create
# returns: metadata dictionary for entire document
#
proc ::gpx::GetGPXMetadata {token} {
set gpxNode [$::gpx::gpx(dom,$token) documentElement]
set version $::gpx::gpx(version,$token)
set creator [$gpxNode getAttribute creator ?]
set attr [dict create version $version creator $creator]
if {[package vcompare $version 1.0] == 0} {
set result [::gpx::_ExtractNodeMetadata $token $gpxNode]
} else {
set meta [$::gpx::gpx(dom,$token) selectNodes /gpx:gpx/gpx:metadata]
set result [::gpx::_ExtractNodeMetadata $token $meta]
}
set result [dict merge $attr $result]
return $result
}
##+##########################################################################
#
# ::gpx::GetWaypointCount -- Return number of waypoints defined in gpx file
# parameter: token returned by ::gpx::Create
# returns: number of waypoints
#
proc ::gpx::GetWaypointCount {token} {
set wpts [$::gpx::gpx(dom,$token) selectNodes /gpx:gpx/gpx:wpt]
return [llength $wpts]
}
##+##########################################################################
#
# ::gpx::GetAllWaypoints -- Returns list of waypoints, each item consists
# of {lat lon <dictionary of metadata>}
# parameter: token returned by ::gpx::Create
# returns: list of waypoint items
#
proc ::gpx::GetAllWaypoints {token} {
set wpts [$::gpx::gpx(dom,$token) selectNodes /gpx:gpx/gpx:wpt]
set result {}
foreach wpt $wpts {
set lat [$wpt getAttribute "lat" ?]
set lon [$wpt getAttribute "lon" ?]
set meta [::gpx::_ExtractNodeMetadata $token $wpt]
lappend result [list $lat $lon $meta]
}
return $result
}
##+##########################################################################
#
# ::gpx::GetTrackCount -- returns how many tracks
# parameter: token returned by ::gpx::Create
# returns: number of tracks
#
proc ::gpx::GetTrackCount {token} {
set trks [$::gpx::gpx(dom,$token) selectNodes /gpx:gpx/gpx:trk]
return [llength $trks]
}
##+##########################################################################
#
# ::gpx::GetTrackMetadata -- Returns metadata dictionary for this track
# parameter: token returned by ::gpx::Create
# whichTrack: which track to get (1 based)
# returns: metadata dictionary for this track
#
proc ::gpx::GetTrackMetadata {token whichTrack} {
set trkNode [$::gpx::gpx(dom,$token) selectNodes \
/gpx:gpx/gpx:trk\[$whichTrack\]]
set meta [::gpx::_ExtractNodeMetadata $token $trkNode]
}
##+##########################################################################
#
# ::gpx::GetTrackPoints -- Returns track consisting of a list of track points,
# each of which consists of {lat lon <dictionary of metadata>}
# parameter: token returned by ::gpx::Create
# whichTrack: which track to get (1 based)
# returns: list of trackpoints for given track
#
proc ::gpx::GetTrackPoints {token whichTrack} {
set trkpts [$::gpx::gpx(dom,$token) selectNodes \
/gpx:gpx/gpx:trk\[$whichTrack\]//gpx:trkpt]
set result {}
foreach trkpt $trkpts {
set lat [$trkpt getAttribute "lat" ?]
set lon [$trkpt getAttribute "lon" ?]
set meta [::gpx::_ExtractNodeMetadata $token $trkpt]
lappend result [list $lat $lon $meta]
}
return $result
}
##+##########################################################################
#
# ::gpx::GetRouteCount -- returns how many routes
# parameter: token returned by ::gpx::Create
# returns: number of routes
#
proc ::gpx::GetRouteCount {token} {
set rtes [$::gpx::gpx(dom,$token) selectNodes /gpx:gpx/gpx:rte]
return [llength $rtes]
}
##+##########################################################################
#
# ::gpx::GetRouteMetadata -- Returns metadata dictionary for this route
# parameter: token returned by ::gpx::Create
# whichRoute: which route to get (1 based)
# returns: metadata dictionary for this route
#
proc ::gpx::GetRouteMetadata {token whichRoute} {
set rteNode [$::gpx::gpx(dom,$token) selectNodes \
/gpx:gpx/gpx:rte\[$whichRoute\]]
set meta [::gpx::_ExtractNodeMetadata $token $rteNode]
}
##+##########################################################################
#
# ::gpx::GetRoutePoints -- Returns route consisting of a list of route points,
# each of which consists of {lat lon <dictionary of metadata>}
# parameter: token returned by ::gpx::Create
# whichRoute: which route to get (1 based)
# returns: list of routepoints for given route
#
proc ::gpx::GetRoutePoints {token whichRoute} {
set rtepts [$::gpx::gpx(dom,$token) selectNodes \
/gpx:gpx/gpx:rte\[$whichRoute\]//gpx:rtept]
set result {}
foreach rtept $rtepts {
set lat [$rtept getAttribute "lat" ?]
set lon [$rtept getAttribute "lon" ?]
set meta [::gpx::_ExtractNodeMetadata $token $rtept]
lappend result [list $lat $lon $meta]
}
return $result
}
##+##########################################################################
#
# ::gpx::_ExtractNodeMetadata -- Internal routine to get all
# the optional data associated with an xml element. For most
# elements we just want element name and text value but some
# we want their attributes and some we want children metadata.
#
proc ::gpx::_ExtractNodeMetadata {token node} {
set result {}
if {$node eq ""} { return $result }
# author and email elements are different in version 1.0 and 1.1
set onlyAttributes [list "bounds" "email"]
set attributesAndElements [list "extension" "author" "link" "copyright"]
if {$::gpx::gpx(version,$token) == 1.0} {
set onlyAttributes [list "bounds"]
set attributesAndElements [list "extension" "link" "copyright"]
}
foreach child [$node childNodes] {
set nodeName [$child nodeName]
if {$nodeName in {"wpt" "trk" "trkseg" "trkpt" "rte" "rtept"}} continue
if {[string match "topografix:*" $nodeName]} continue
if {$nodeName in $onlyAttributes} {
set attr [::gpx::_GetAllAttributes $child]
lappend result $nodeName $attr
} elseif {$nodeName in $attributesAndElements} {
set attr [::gpx::_GetAllAttributes $child]
set meta [::gpx::_ExtractNodeMetadata $token $child]
set meta [concat $attr $meta]
lappend result $nodeName $meta
} else {
lappend result $nodeName [$child asText]
}
}
return $result
}
##+##########################################################################
#
# ::gpx::_GetAllAttributes -- Returns dictionary of attribute name and value
#
proc ::gpx::_GetAllAttributes {node} {
set result {}
foreach attr [$node attributes] {
lappend result $attr [$node getAttribute $attr]
}
return $result
}
################################################################
package provide gpx 1
return
|
