app-toolkit/kotlin-checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  ~ Copyright (C) 2016 The Android Open Source Project
  ~
  ~ 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
  ~
  ~      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
  ~ limitations under the License.
  -->

<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<!-- this is a very limited set of checkstyle rules mainly because TreeWalker rules are not
supported for kt files yet.-->
<module name="Checker">
    <property name="severity" value="warning"/>
    <property name="charset" value="UTF-8"/>
    <module name="SuppressionCommentFilter">
        <property name="offCommentFormat" value="CHECKSTYLE:OFF IndentationCheck"/>
        <property name="onCommentFormat" value="CHECKSTYLE:ON IndentationCheck"/>
        <property name="checkFormat" value="IndentationCheck"/>
    </module>
    <module name="SuppressionCommentFilter">
        <property name="offCommentFormat" value="CHECKSTYLE:OFF Generated code"/>
        <property name="onCommentFormat" value="CHECKSTYLE:ON Generated code"/>
    </module>
    <module name="FileTabCharacter">
        <property name="severity" value="error"/>
    </module>
    <module name="NewlineAtEndOfFile">
        <property name="severity" value="error"/>
    </module>
    <module name="RegexpSingleline">
        <property name="severity" value="error"/>
        <property name="format" value="[ \t]+$"/>
        <property name="message" value="Trailing whitespace"/>
    </module>
    <module name="RegexpHeader">
        <property name="severity" value="error"/>
        <message key="header.mismatch"
                 value="Android Copyright header seems to be incorrect. Expected ''{0}'' on this line."/>
        <property name="header" value="^/\*\n \* Copyright \([Cc]\) [0-9]{4} The Android Open Source Project\n \*\n \* Licensed under the Apache License, Version 2\.0 \(the \&quot;License\&quot;\);\n \* you may not use this file except in compliance with the License.\n \* You may obtain a copy of the License at\n \*\n \*      http:\/\/www\.apache\.org\/licenses\/LICENSE-2\.0\n \*\n \* Unless required by applicable law or agreed to in writing, software\n \* distributed under the License is distributed on an &quot;AS IS&quot; BASIS,\n \* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.\n \* See the License for the specific language governing permissions and\n \* limitations under the License\.\n \*\/" />
    </module>
</module>