add option to force file format for helper addPolyline

[blq]

I noticed that helper.addPolyline uses, quite reasonably, file extention to branch for gpx vs kml. But I have some data sources that don't use extentions. May I suggest an optional flag to force a specific format?
(Yes, I could "trick" it by adding a "&fakeExtension=.gpx" to the url but felt a bit odd.)

[katemihalikova]

It's true that helper.addPolyline tries to detect the format using the file extension, however, if this check fails, it tries to extract data from the data source anyway. It tries to parse it as GeoJSON, then as GPX, then as KML, while being optimized to parse the XML tree just once for both checks. This means that an extensionless data source should be parsed without problems and a new flag is not needed.

If this does not solve the problem you are having, please tell us more about what obstacles are you facing and, if possible, also provide some code we can have a look at. Thank you!

[blq]

As I see the logic it does: 1 assume it's a url. 2, check if the url is gpx or kml. 3. Here it assumes it's string data input. My data was an external url (without extension) to geojson, it ends up in that 3rd case and thus fails.

[lesbaa]

Hi @blq Are you happy with this workaround? Can we close this issue?

[blq]

No, please see my answer above; extensionless url are not supported, those will be parsed as inline string data.
In fact, even urls with ".geojson" will currently not be loaded as urls at all (only .gpx and .kml). See the if-else clauses here:
https://github.com/maptiler/maptiler-sdk-js/blob/main/src/helpers/vectorlayerhelpers.ts