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runtime(java): Exclude lambda expressions from _when_ _switch-case_ label clauses (#14945)

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These guard clauses are always boolean expressions, whereas
lambda expressions can only appear in either an assignment,
a casting, or an invocation context.

References:
https://docs.oracle.com/javase/specs/jls/se21/html/jls-14.html#jls-14.11.1
https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.27

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aliaksei Budavei
2024-06-09 19:39:52 +03:00
committed by GitHub
parent 477402ecf9
commit d6b4afb636
12 changed files with 158 additions and 48 deletions
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52
runtime/syntax/testdir/input/java_lambda_expressions.java
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@@ -4,8 +4,9 @@
import java.lang.annotation.ElementType;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Predicate;
class LambdaExpressionsTests
class LambdaExpressionsTests // JDK 21+.
{
<I1, C1, C2, T1, T2, T3, Z1, Z2, Z3, S1, S2, S3> void test()
{ // Schönfinkel's functions.
@@ -101,4 +102,53 @@ class LambdaExpressionsTests
Function<Function<A1, Function<A2, A3>>,
Function<Function<A1, A2>,
Function<A1, A3>>> { }
static void echo(Object o) { System.out.println(o); }
static {
enum Letters { OTHER, ALPHA, BETA }
Letters other = Letters.OTHER;
switch (other) {
case Letters alpha when Letters.ALPHA == alpha:
{ echo(alpha); break; }
case Letters beta when Letters.BETA == beta:
{ echo(beta); break; }
default: { echo(other); }
}
echo(switch (other) {
case Letters alpha when Letters.ALPHA == alpha
-> alpha;
case Letters beta when Letters.BETA == beta
-> beta;
default -> other;
});
switch (null) {
case String str when !"<empty>".equals(switch (str) {
case String str_ when
Predicate.<String>not(text ->
!text.isEmpty())
.test(str_)
-> "<empty>";
case String str_ -> str_;
}): { echo(str); break; }
case null: default: { echo("Other"); }
};
echo(switch (null) {
case String str when !"<empty>".equals(
switch (str) {
case String str_ when
Predicate.<String>not(text ->
!text.isEmpty())
.test(str_)
-> "<empty>";
case String str_ -> str_;
}) -> str;
case null, default -> "Other";
});
}
}