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unit gpxunit;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, mystringlistunit;
type
tTrkPt = record
lat,lon,ele,time: string;
end;
tTrack = record
name: string;
trkPts: array of tTrkPt;
end;
tGpxInhalt = record
kopf: string;
trks: array of tTrack;
end;
tGpxFile = class
prefix: tMyStringList;
gpx: array of tGpxInhalt;
constructor create;
destructor destroy; override;
function loadFromFile(s: string): boolean;
procedure saveToFile(s: string);
end;
implementation
uses
lowlevelunit, dialogs;
constructor tGpxFile.create;
begin
inherited create;
prefix:=tMyStringList.create;
setLength(gpx,0);
end;
destructor tGpxFile.destroy;
begin
prefix.free;
setLength(gpx,0);
inherited destroy;
end;
function tGpxFile.loadFromFile(s: string): boolean;
var
f: tMyStringList;
m: longint;
t,u: string;
begin
result:=false;
prefix.clear;
setLength(gpx,0);
f:=tMyStringList.create;
f.loadFromFile(s);
f.splitLines('<','>');
m:=0;
t:='';
f.rewind;
while f.readln(t) do
case m of
0:
if startetMit('<gpx ',t) then begin
setLength(gpx,length(gpx)+1);
setLength(gpx[length(gpx)-1].trks,0);
gpx[length(gpx)-1].kopf:=erstesArgument(t,'>');
inc(m);
end
else
prefix.add(t);
1:
if t='<trk>' then begin
setLength(gpx[length(gpx)-1].trks,length(gpx[length(gpx)-1].trks)+1);
gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].name:='';
setLength(gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].trkPts,0);
inc(m);
end
else if t='</trk>' then
dec(m);
2:
if t='<name>' then begin
t:='';
u:='';
repeat
t:=t+#10+u;
if not f.readln(u) then
exit;
until u='</name>';
delete(t,1,2);
gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].name:=t;
end
else if t='<trkseg>' then
inc(m)
else if t='</trkseg>' then
dec(m);
3:
if startetMit('<trkpt ',t) then begin
setLength(gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].trkPts,
length(gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].trkPts)+1);
with gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].trkPts[
length(gpx[length(gpx)-1].trks[length(gpx[length(gpx)-1].trks)-1].trkPts)-1] do begin
erstesArgument(t,'lat="');
lat:=erstesArgument(t,'"');
erstesArgument(t,'lon="');
lon:=erstesArgument(t,'"');
repeat
if not f.readln(t) then
exit;
until t='<ele>';
t:='';
u:='';
repeat
t:=t+#10+u;
if not f.readln(u) then
exit;
until u='</ele>';
delete(t,1,2);
ele:=t;
repeat
if not f.readln(t) then
exit;
until t='<time>';
t:='';
u:='';
repeat
t:=t+#10+u;
if not f.readln(u) then
exit;
until u='</time>';
delete(t,1,2);
time:=t;
end;
end
else if pos('</trkseg>',t)>0 then
dec(m);
end{of Case};
f.free;
result:=true;
end;
procedure tGpxFile.saveToFile(s: string);
var
f: textFile;
i,j,k: longint;
begin
assignFile(f,s);
rewrite(f);
writeln(f,prefix.text);
for i:=0 to length(gpx)-1 do begin
writeln(f,'<gpx'+gpx[i].kopf+'>');
for j:=0 to length(gpx[i].trks)-1 do begin
writeln(f,' <trk>');
while pos('<',gpx[i].trks[j].name)>0 do
gpx[i].trks[j].name[pos('<',gpx[i].trks[j].name)]:='-';
while pos('>',gpx[i].trks[j].name)>0 do
gpx[i].trks[j].name[pos('>',gpx[i].trks[j].name)]:='+';
writeln(f,' <name>'+gpx[i].trks[j].name+'</name>');
writeln(f,' <trkseg>');
for k:=0 to length(gpx[i].trks[j].trkPts)-1 do begin
writeln(f,' <trkpt lat="'+gpx[i].trks[j].trkPts[k].lat+
'" lon="'+gpx[i].trks[j].trkPts[k].lon+'">');
writeln(f,' <ele>'+gpx[i].trks[j].trkPts[k].ele+'</ele>');
writeln(f,' <time>'+gpx[i].trks[j].trkPts[k].time+'</time>');
writeln(f,' </trkpt>');
end;
writeln(f,' </trkseg>');
writeln(f,' </trk>');
end;
writeln(f,'</gpx>');
end;
closeFile(f);
end;
end.
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