@Nullable
public static ErlangFunction getZeroArityFunction(@Nullable PsiElement psiElement) {
ErlangFunction function =
psiElement instanceof ErlangFunction
? (ErlangFunction) psiElement
: PsiTreeUtil.getParentOfType(psiElement, ErlangFunction.class);
int arity = function == null ? -1 : function.getArity();
return 0 == arity ? function : null;
}
private static void assertResolvesTo(
@Nullable PsiReference reference, @NotNull String file, @NotNull String function, int arity) {
assertNotNull(reference);
ErlangFunction resolvedFunction =
ObjectUtils.tryCast(reference.resolve(), ErlangFunction.class);
assertNotNull(resolvedFunction);
String actualFile = resolvedFunction.getContainingFile().getName();
assertEquals(file, actualFile);
assertEquals(function, resolvedFunction.getName());
assertEquals(arity, resolvedFunction.getArity());
}