fix negative values in switch/cases, fixes #280 (#283)

Author: AlexHaxe

src/checkstyle/token/TokenStream.hx

@@ -196,7 +196,7 @@ class TokenStream {
 		var prevTok:Token = tokens[previous];
 		switch (prevTok.tok) {
 			case Binop(_), Unop(_), BkOpen, POpen, Comma, DblDot, IntInterval(_), Question:
-			case Kwd(KwdReturn), Kwd(KwdIf), Kwd(KwdElse), Kwd(KwdWhile), Kwd(KwdDo), Kwd(KwdFor):
+			case Kwd(KwdReturn), Kwd(KwdIf), Kwd(KwdElse), Kwd(KwdWhile), Kwd(KwdDo), Kwd(KwdFor), Kwd(KwdCase):
 			default:
 				return new TokenTree(tok.tok, tok.pos, tok.index);
 		}

test/checks/whitespace/OperatorWhitespaceCheckTest.hx

@@ -193,6 +193,11 @@ abstract OperatorWhitespaceCheckTests(String) to String {
 				z: 20 * 10
 			};
 			var y:Array<String> = [];
+
+			switch int() {
+				case -1:
+				default:
+			}
 		}
 	}