Github user ScrapCodes commented on a diff in the pull request:
https://github.com/apache/spark/pull/284#discussion_r11194651
--- Diff:
project/spark-style/src/main/scala/org/apache/spark/scalastyle/SpaceAfterColonStyleCheck.scala
---
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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
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+ */
+
+package org.apache.spark.scalastyle
+
+import scalariform.lexer.Tokens.COLON
+import scalariform.parser.CompilationUnit
+import org.scalastyle._
+
+class SpaceAfterColonStyleCheck extends ScalariformChecker {
--- End diff --
We can not have any Token checker as colon. Since in case of colon we
ensure no space before it and exactly one space after it.
for example
```scala
val a: Int = 1 // valid
val b : Int = 1 //Invalid
val c:Int = 1 //Invalid
val c :Int = 1 //Invalid
```
Also there is a separate check for keywords.
https://github.com/ScrapCodes/scalastyle/commit/cccb6b6d8e04521daa8af7e4f8c0e0bb35606f22
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