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runtime(java): Optionally recognise all primitive constants in _switch-case_ labels

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Define "g:java_syntax_previews" and include number 455 in
its list to enable this recognition:
------------------------------------------------------------
	let g:java_syntax_previews = [455]
------------------------------------------------------------

Reference:
https://openjdk.org/jeps/455

closes: #15698

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aliaksei Budavei
2024-09-19 18:22:58 +02:00
committed by Christian Brabandt
parent 41c7bbaf8f
commit 23079450a8
7 changed files with 160 additions and 9 deletions
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64
runtime/syntax/testdir/input/java_previews_455.java Normal file
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@@ -0,0 +1,64 @@
// VIM_TEST_SETUP let g:java_syntax_previews = [455]
class PrimitiveSwitchTests // JDK 23+ (--enable-preview --release 23).
{
static void echo(Object o) { System.out.println(o); }
static {
long g = 2L;
switch (g) {
case 0L: { echo(0L); break; }
case 1L: { echo(1L); break; }
default: { echo(-1L); break; }
}
echo(switch (g) {
case 0L -> 0L;
case 1L -> 1L;
default -> -1L;
});
boolean bool = false;
switch (bool) {
case true: { echo(true); break; }
case false: { echo(false); break; }
}
echo(switch (bool) {
case true -> true;
case false -> false;
});
float f = 2.0f;
switch (f) {
case 0.0f: { echo(0.0f); break; }
case 1.0f: { echo(1.0f); break; }
default: { echo(-1.0f); break; }
}
echo(switch (f) {
case 0.0f -> 0.0f;
case 1.0f -> 1.0f;
default -> -1.0f;
});
double d = 2.0;
switch (d) {
case 0.0: { echo(0.0); break; }
case 1.0: { echo(1.0); break; }
default: { echo(-1.0); break; }
}
echo(switch (d) {
case 0.0 -> 0.0;
case 1.0 -> 1.0;
default -> -1.0;
});
}
}