Check for o_O as exception message

Closes gh-189

Author: philwebb

spring-javaformat/spring-javaformat-checkstyle/src/main/java/io/spring/javaformat/checkstyle/check/SpringCatchCheck.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2019 the original author or authors.
+ * Copyright 2017-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -60,6 +60,9 @@ private void checkIdent(DetailAST ast) {
 		if (text.length() == 1) {
 			log(ast.getLineNo(), ast.getColumnNo(), "catch.singleLetter");
 		}
+		if (text.toLowerCase().equals("o_o")) {
+			log(ast.getLineNo(), ast.getColumnNo(), "catch.wideEye");
+		}
 	}
 
 }

spring-javaformat/spring-javaformat-checkstyle/src/main/resources/io/spring/javaformat/checkstyle/check/messages.properties

@@ -1,4 +1,5 @@
 catch.singleLetter=Single letter catch variable (use "ex" instead).
+catch.wideEye=''o_O'' catch variable (use "ex" instead).
 header.unexpected=Unexpected header.
 header.mismatch=Line does not match expected header line of ''{0}''.
 javadoc.badCase=Javadoc element descriptions should not start with an uppercase letter.

spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/CatchOo.txt

@@ -0,0 +1 @@
++'o_O' catch variable (use "ex" instead)

spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/CatchOo.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2017-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * A invalid catch with o_O as the variable.
+ *
+ * @author Phillip Webb
+ */
+public class CatchOo {
+
+	public void test() {
+		try {
+			new String("foo");
+		}
+		catch (IllegalStateException o_O) {
+			// Ignore
+		}
+	}
+
+}