Hi Matthias,
looks like jackpot doesn't understand
if (o instanceof Integer i)
yet.
I tested with:
if ($origVar instanceof $T $t) {
}
=>
if ($origVar instanceof $T $t) {
}
;;
and it never initialized $T or $t.
There is a "Changing source level to 1.8" line in the log, I saw that
before but never had time to investigate, its possible that jackpot
can't match anything beyond 8 language level because of that (if at all
related to this issue).
another thing what jackpot doesn't understand is the short form of
lambdas, e.g:
$stream.mapToObj(($x) -> $x)
never matches anything
-michael
On 23.11.21 23:37, Matthias Bläsing wrote:
Hi,
it would be great if someone could give me a hint what I'm missing:
I would like to rewrite a pattern matching if into a if checking the
condition and then doing the necessary cast.
Basicly:
if (o instanceof FancyObject fancy) {
doSomethingWithFancy(fancy);
}
Should become:
if (o instanceof FancyObject) {
FancyObject fancy = (FancyObject) o;
doSomethingWithFancy(fancy);
}
And yes - the intention is to lower the source level from 14+ to 8.
I tried this:
------------------------------
if ($origVar instanceof $targetClass $targetName) {
$body$;
}
=>
if ($origVar instanceof $targetClass) {
$targetClass $targetName = ($targetClass) $origVar;
$body$;
}
;;
------------------------------
But that resulted in an partial rewrite:
------------------------------
public class Mavenproject1 {
public static void main(String[] args) {
Object o = 1;
if(o instanceof Integer i) {
System.out.println("Integer: " + i);
}
}
}
------------------------------
became
------------------------------
public class Mavenproject1 {
public static void main(String[] args) {
Object o = 1;
if(o instanceof $targetClass) {
$targetClass $targetName = ($targetClass) o;
System.out.println("Integer: " + i);
}
}
}
------------------------------
So it was matched and $origVar was picked up correctly, but the other
variables are totally ignored.
What am I missing?!
Greetings
Matthias
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