Vincent Bussol created JEXL-454:
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Summary: Switch NaN case not found
Key: JEXL-454
URL: https://issues.apache.org/jira/browse/JEXL-454
Project: Commons JEXL
Issue Type: Bug
Affects Versions: 3.6.1
Reporter: Vincent Bussol
The switch / case statement (or expression) does not find a NaN constant case.
{code:java}
let v = NaN;
switch (v) {
case NaN:
// not found
break;
case 1:
// some code
} {code}
Without a default case, this example ends in error (no case in switch statement
for: NaN).
A simple test:
{code:java}
@Test
void testSwitchNaN0() {
// a one statement script
final String src = "switch (x) {\n"
+ " case NaN: return 'NotANumber';\n"
+ " case 1: return 'one';\n"
+ " case 2: return 'two';\n"
+ " case 3: return 'three';\n"
+ " default: return 'many';\n"
+ "}";
final JexlEngine jexl = new JexlBuilder().create();
final JexlScript script = jexl.createScript(src, "x");
Object result = script.execute(null, Double.NaN);
assertEquals("NotANumber", result);
result = script.execute(null, 1);
assertEquals("one", result);
result = script.execute(null, 42);
assertEquals("many", result);
} {code}
It appears that the switch node stores the index using the value Double.NaN and
then looks it up using the value JexlParser.NAN (via the 'switchCode' method).
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