Allow references to previous matches in validator rules

[Dakon]

I would like to do the following checks in validator:

-match everything that has the same foo and bar values:

*[foo][bar={1.value}]

-match something that has the same tag as it's parent

way[foo] € node[{1}]

One probably needs a different notation for the second one to allow referencing both own matches as well as parent ones: way[foo] € node[{parent.1}][bar][baz={2.value}]

[Klumbumbus]

This should work with classes, shouldn't it?

https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation#Classes

[anonymous]

I don't get how I could create validator rules that way. Could you give me an example of a rule that matches e.g. highways that have identical foo and bar tags (highway=primary foo=baz bar=baz)?

[Klumbumbus]

ok, not with classes, but should be possible. See the text below the table at https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation#Conditionselector (However I'm not sure if this is availible for rules. I did not test)

[Klumbumbus]

So you example should be *[highway=primary][foo=baz][foo=*bar]

[simon04]

You might also be looking for https://josm.openstreetmap.de/doc/org/openstreetmap/josm/gui/mappaint/mapcss/ExpressionFactory.Functions.html#tag(org.openstreetmap.josm.gui.mappaint.Environment,%20java.lang.String)

Give *[highway=primary][tag("foo")=tag("bar")] a try …

[Dakon]

At least [foo=*bar] works. I still need a way to do that for ∈ matches.

[simon04]

We have the MapCSS functions parent_tag(key) as well as child_tag(key). It should be possible using those, e.g. way[foo] > node[tag("foo")=parent_tag("foo")] {}.

[simon04]

In 8784/josm:

see #11278 - Add test case w.r.t. parent_tag

This checks whether the child's tag equals the parent's tag.