记录下Scalastyle规则，方便查询。内容比较多，使用Ctrl + F 输入需要查询的检查器进行搜索查询。
目录
介绍
Scalastyle 是专门针对Scala代码开发的轻巧的code style检测工具，类似于Java代码检查工具Checkstyle、Findbugs等。可以在Maven中集成到项目中，方便代码风格的检测。
最下面附上了Spark2.4.3的 Scalastyle 配置代码，可以借鉴。
Scalastyle常用关键字 //scalastyle:on 和 //scalastyle:off，如：
//scalastyle:on println
if (args.length < 2) {
println("Usage:")
println("DRIVER_MEMORY=[mem] spark-submit " +
"com.github.ehiggs.spark.terasort.TeraGen " +
"spark-terasort-1.0-SNAPSHOT-with-dependencies.jar " +
"[output-size] [output-directory]")
println(" ")
println("Example:")
println("DRIVER_MEMORY=50g spark-submit " +
"com.github.ehiggs.spark.terasort.TeraGen " +
"spark-terasort-1.0-SNAPSHOT-with-dependencies.jar " +
"100G file:///scratch/username/terasort_in")
System.exit(0)
}
//scalastyle:off println
规则
官网说明：已实现的规则
目前已实现规则有69条
使用示例
主要在 scalastyle-config.xml 中设置。
org.scalastyle.file.FileLengthChecker 检查文件中的行数
<check enabled="true" class="org.scalastyle.file.FileLengthChecker" level="warning">
<parameters>
<parameter name="maxFileLength">800</parameter>
</parameters>
</check>
org.scalastyle.file.FileLineLengthChecker 检查一行中的字符数
<check enabled="true" class="org.scalastyle.file.FileLineLengthChecker" level="warning">
<parameters>
<parameter name="maxLineLength">100</parameter>
<parameter name="tabSize">2</parameter>
<parameter name="ignoreImports">true</parameter>
</parameters>
</check>
org.scalastyle.file.FileTabChecker 检查文件中是否有标签
<check enabled="true" class="org.scalastyle.file.FileTabChecker" level="warning"/>
org.scalastyle.file.HeaderMatchesChecker 检查每个文件的前几行与文本匹配
<check enabled="true" class="org.scalastyle.file.HeaderMatchesChecker" level="warning">
<parameters>
<parameter name="regex">false</parameter>
<parameter name="header">// Copyright \(C\) 2011-2012 the original author or authors.</parameter>
</parameters>
</check>
或者
<check enabled="true" class="org.scalastyle.file.HeaderMatchesChecker" level="warning">
<parameters>
<parameter name="regex">true</parameter>
<parameter name="header">// Copyright \(C\) (?:\d{4}-)?\d{4} the original author or authors.</parameter>
</parameters>
</check>
org.scalastyle.file.IndentationChecker 检查行是否由Tab的倍数缩进
<check enabled="true" class="org.scalastyle.file.IndentationChecker" level="warning">
<parameters>
<parameter name="tabSize">2</parameter>
<parameter name="methodParamIndentSize">2</parameter>
<parameter name="classParamIndentSize">4</parameter>
</parameters>
</check>
org.scalastyle.file.NewLineAtEofChecker 检查文件是否以换行符结尾
<check enabled="true" class="org.scalastyle.file.NewLineAtEofChecker" level="warning"/>
org.scalastyle.file.NoNewLineAtEofChecker 检查文件不是以换行符结尾
<check enabled="true" class="org.scalastyle.file.NoNewLineAtEofChecker" level="warning"/>
org.scalastyle.file.RegexChecker 检查正则表达式是否匹配
<check enabled="true" class="org.scalastyle.file.RegexChecker" level="warning">
<parameters>
<parameter name="regex">(?m)^\s*$(\r|)\n^\s*$(\r|)\n</parameter>
<parameter name="line">false</parameter>
</parameters>
<customMessage>No double blank lines</customMessage>
</check>
org.scalastyle.file.WhitespaceEndOfLineChecker 检查行尾没有空格
<check enabled="true" class="org.scalastyle.file.WhitespaceEndOfLineChecker" level="warning">
<parameters>
<parameter default="false" type="boolean" name="ignoreWhitespaceLines"/>
</parameters>
</check>
org.scalastyle.scalariform.BlockImportChecker 检查导入块是否使用
<check enabled="true" class="org.scalastyle.scalariform.BlockImportChecker" level="warning"/>
org.scalastyle.scalariform.ClassNamesChecker 检查类名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.ClassNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ClassTypeParameterChecker 检查类的类型参数与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.ClassTypeParameterChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Z_]$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.CovariantEqualsChecker 检查类和对象在没有覆盖的情况下定义了相等(java.lang.object)
<check enabled="true" class="org.scalastyle.scalariform.CovariantEqualsChecker" level="warning"/>
org.scalastyle.scalariform.CyclomaticComplexityChecker 检查方法的参数复杂度是否超过设定值
<check enabled="true" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" level="warning">
<parameters>
<parameter name="maximum">10</parameter>
<parameter name="countCases">true</parameter>
</parameters>
</check>
org.scalastyle.scalariform.DeprecatedJavaChecker 检查应该用Scala @deprecated代替Java @Deprecated
<check enabled="true" class="org.scalastyle.scalariform.DeprecatedJavaChecker" level="warning"/>
org.scalastyle.scalariform.DisallowSpaceAfterTokenChecker 检查某些既定标记后不允许使用空格
<check enabled="true" class="org.scalastyle.scalariform.DisallowSpaceAfterTokenChecker" level="warning">
<parameters>
<parameter name="tokens">LPAREN</parameter>
</parameters>
</check>
org.scalastyle.scalariform.DisallowSpaceBeforeTokenChecker 检查某些既定标记前不允许使用空格
<check enabled="true" class="org.scalastyle.scalariform.DisallowSpaceBeforeTokenChecker" level="warning">
<parameters>
<parameter name="tokens">COLON, COMMA, RPAREN</parameter>
</parameters>
</check>
org.scalastyle.scalariform.EmptyClassChecker 检查类或抽象类没有成员，则可以省略大括号
<check enabled="true" class="org.scalastyle.scalariform.EmptyClassChecker" level="warning"/>
org.scalastyle.scalariform.EmptyInterpolatedStringChecker 检查是否有对字符串插入空值
<check enabled="true" level="warning" class="org.scalastyle.scalariform.EmptyInterpolatedStringChecker"/>
org.scalastyle.scalariform.EnsureSingleSpaceAfterTokenChecker 检查某些既定标记后是否有空间
<check enabled="true" class="org.scalastyle.scalariform.EnsureSingleSpaceAfterTokenChecker" level="warning">
<parameters>
<parameter name="tokens">COLON, IF</parameter>
</parameters>
</check>
org.scalastyle.scalariform.EnsureSingleSpaceBeforeTokenChecker 检查某些既定标记前是否有空间
<check enabled="true" class="org.scalastyle.scalariform.EnsureSingleSpaceBeforeTokenChecker" level="warning">
<parameters>
<parameter name="tokens">LPAREN</parameter>
</parameters>
</check>
org.scalastyle.scalariform.EqualsHashCodeChecker 检查如果一个类实现了或等于Hash，那它应该实现另一个类
<check enabled="true" class="org.scalastyle.scalariform.EqualsHashCodeChecker" level="warning"/>
org.scalastyle.scalariform.FieldNamesChecker 检查字段名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.FieldNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z0-9]*$</parameter>
<parameter name="objectFieldRegex">^[A-Z][A-Za-z0-9]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ForBraceChecker 检查for是否使用大括号
<check enabled="true" class="org.scalastyle.scalariform.ForBraceChecker" level="warning"/>
org.scalastyle.scalariform.IfBraceChecker 检查if是否使用大括号
<check enabled="true" class="org.scalastyle.scalariform.IfBraceChecker" level="warning">
<parameters>
<parameter name="singleLineAllowed">true</parameter>
<parameter name="doubleLineAllowed">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.IllegalImportsChecker 检查类没有导入某些类
<check enabled="true" class="org.scalastyle.scalariform.IllegalImportsChecker" level="warning"/>
org.scalastyle.scalariform.ImportGroupingChecker 检查导入是否分组
<check enabled="true" class="org.scalastyle.scalariform.ImportGroupingChecker" level="warning"/>
org.scalastyle.scalariform.ImportOrderChecker 检查是否根据样式配置对导入进行分组和排序
<check enabled="true" class="org.scalastyle.scalariform.ImportOrderChecker" level="warning">
<parameters>
<parameter name="groups">java,scala,others</parameter>
<parameter name="group.java">javax?\..+</parameter>
<parameter name="group.scala">scala\..+</parameter>
<parameter name="group.others">.+</parameter>
</parameters>
</check>
org.scalastyle.scalariform.LowercasePatternMatchChecker 检查case语句模式匹配是否为小写，因为这可能导致混淆
<check enabled="true" class="org.scalastyle.scalariform.LowercasePatternMatchChecker" level="warning"/>
org.scalastyle.scalariform.MagicNumberChecker 检查魔数是否使用var定义
<check enabled="true" class="org.scalastyle.scalariform.MagicNumberChecker" level="warning">
<parameters>
<parameter name="ignore">-1,0,1,2,3</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MethodArgumentNamesChecker 检查方法参数名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.MethodArgumentNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z0-9]*$</parameter>
<parameter name="ignoreRegex">^$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MethodLengthChecker 检查方法不超过最大长度
<check enabled="true" class="org.scalastyle.scalariform.MethodLengthChecker" level="warning">
<parameters>
<parameter name="maxLength">50</parameter>
<parameter name="ignoreComments">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MethodNamesChecker 检查方法名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.MethodNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Za-z]*$</parameter>
<parameter name="ignoreRegex">^.*$</parameter>
<parameter name="ignoreOverride">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MultipleStringLiteralsChecker 检查字符串文字没有多次出现
<check enabled="true" class="org.scalastyle.scalariform.MultipleStringLiteralsChecker" level="warning">
<parameters>
<parameter name="allowed">1</parameter>
<parameter name="ignoreRegex">^\"\"$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NamedArgumentChecker 检查参数是否命名
<check enabled="true" class="org.scalastyle.scalariform.NamedArgumentChecker" level="warning">
<parameters>
<parameter name="checkString">false</parameter>
<parameter name="ignoreMethod">^set.+$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NoCloneChecker 检查类和对象没有定义clone()方法
<check enabled="true" class="org.scalastyle.scalariform.NoCloneChecker" level="warning"/>
org.scalastyle.scalariform.NoFinalizeChecker 检查类和对象是否定义了Finish()方法
<check enabled="true" class="org.scalastyle.scalariform.NoFinalizeChecker" level="warning"/>
org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker 检查左括号‘[’后没有空格
<check enabled="true" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" level="warning"/>
org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker 检查左括号‘[’之前没有空格
<check enabled="true" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" level="warning"/>
org.scalastyle.scalariform.NoWhitespaceBeforeRightBracketChecker 检查右括号“]”之前没有空格
<check enabled="true" class="org.scalastyle.scalariform.NoWhitespaceBeforeRightBracketChecker" level="warning"/>
org.scalastyle.scalariform.NonASCIICharacterChecker 检查是否使用非ASCII字符（Unicode字符）
<check enabled="true" class="org.scalastyle.scalariform.NonASCIICharacterChecker" level="warning"/>
org.scalastyle.scalariform.NotImplementedErrorUsage 检查代码是否有 ??? 操作符
<check enabled="true" class="org.scalastyle.scalariform.NotImplementedErrorUsage" level="warning"/>
org.scalastyle.scalariform.NullChecker 检查是否使用NULL
<check enabled="true" class="org.scalastyle.scalariform.NullChecker" level="warning">
<parameters>
<parameter name="allowNullChecks">true</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NumberOfMethodsInTypeChecker 检查一个类/特性/对象是否申明太多的方法
<check enabled="true" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" level="warning">
<parameters>
<parameter name="maxMethods">30</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NumberOfTypesChecker 检查文件中声明的类型是否过多
<check enabled="true" class="org.scalastyle.scalariform.NumberOfTypesChecker" level="warning">
<parameters>
<parameter name="maxTypes">20</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ObjectNamesChecker 检查对象名称是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.ObjectNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.OverrideJavaChecker 检查java@重写是否被使用
<check enabled="true" class="org.scalastyle.scalariform.OverrideJavaChecker" level="warning"/>
org.scalastyle.scalariform.PackageNamesChecker 检查包名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.PackageNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.PackageObjectNamesChecker 检查包对象名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.PackageObjectNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ParameterNumberChecker 检查方法的参数个数是否超过设置数量
<check enabled="true" class="org.scalastyle.scalariform.ParameterNumberChecker" level="warning">
<parameters>
<parameter name="maxParameters">8</parameter>
</parameters>
</check>
org.scalastyle.scalariform.PatternMatchAlignChecker 检查模式匹配箭头对齐
<check enabled="true" class="org.scalastyle.scalariform.PatternMatchAlignChecker" level="warning"/>
org.scalastyle.scalariform.ProcedureDeclarationChecker 检查申明过程 a：unit= 是否使用=号
<check enabled="true" class="org.scalastyle.scalariform.ProcedureDeclarationChecker" level="warning"/>
org.scalastyle.scalariform.PublicMethodsHaveTypeChecker 检查方法是否具有显式返回类型
<check enabled="true" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" level="warning">
<parameters>
<parameter name="ignoreOverride">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.RedundantIfChecker 检查表达式是否是冗余，如，if (cond) false else true
<check enabled="true" class="org.scalastyle.scalariform.RedundantIfChecker" level="warning"/>
org.scalastyle.scalariform.ReturnChecker 检查是否使用return
<check enabled="true" class="org.scalastyle.scalariform.ReturnChecker" level="warning"/>
org.scalastyle.scalariform.ScalaDocChecker 检查代码格式是否遵循Scaladoc文档说明
<check enabled="true" class="org.scalastyle.scalariform.ScalaDocChecker" level="warning">
<parameters>
<parameter name="ignoreRegex">(.*Spec$)|(.*SpecIT$)</parameter>
<parameter name="ignoreTokenTypes">PatDefOrDcl,TypeDefOrDcl,FunDefOrDcl,TmplDef</parameter>
<parameter name="ignoreOverride">false</parameter>
<parameter name="indentStyle">anydoc</parameter>
</parameters>
</check>
org.scalastyle.scalariform.SimplifyBooleanExpressionChecker 检查Boolean表达式是否可以简化
<check enabled="true" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" level="warning"/>
org.scalastyle.scalariform.SpaceAfterCommentStartChecker 检查在注释后是否有一个空格
<check enabled="true" class="org.scalastyle.scalariform.SpaceAfterCommentStartChecker" level="warning"/>
org.scalastyle.scalariform.SpacesAfterPlusChecker 检查加号后面是否有空格
<check enabled="true" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" level="warning"/>
org.scalastyle.scalariform.SpacesBeforePlusChecker 检查加号前面是否有空格
<check enabled="true" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" level="warning"/>
org.scalastyle.scalariform.StructuralTypeChecker 检查结构类型是否未被使用
<check enabled="true" class="org.scalastyle.scalariform.StructuralTypeChecker" level="warning"/>
org.scalastyle.scalariform.TodoCommentChecker 检查是否使用Todo/Fixme单行注释
<check enabled="true" class="org.scalastyle.scalariform.TodoCommentChecker" level="warning">
<parameters>
<parameter default="TODO|FIXME" type="string" name="words"/>
</parameters>
</check>
org.scalastyle.scalariform.TokenChecker 检查如果有正则表达式，是否在特殊标记中匹配
<check enabled="true" class="org.scalastyle.scalariform.TokenChecker" level="warning">
<parameters>
<parameter name="regex">^[ai]sInstanceOf$</parameter>
</parameters>
<customMessage>Avoid casting.</customMessage>
</check>
org.scalastyle.scalariform.UnderscoreImportChecker 检查是否使用通配符导入
<check enabled="true" class="org.scalastyle.scalariform.UnderscoreImportChecker" level="warning">
<parameters>
<parameter name="ignoreRegex">collection\.JavaConverters\._|scala\.concurrent\.duration\._</parameter>
</parameters>
</check>
org.scalastyle.scalariform.UppercaseLChecker 检查如果使用长字符串，则使用大写字母
<check enabled="true" class="org.scalastyle.scalariform.UppercaseLChecker" level="warning"/>
org.scalastyle.scalariform.VarFieldChecker 检查类和对象是否定义可变字段
<check enabled="true" class="org.scalastyle.scalariform.VarFieldChecker" level="warning"/>
org.scalastyle.scalariform.VarLocalChecker 检查函数是否定义可变变量
<check enabled="true" class="org.scalastyle.scalariform.VarLocalChecker" level="warning"/>
org.scalastyle.scalariform.WhileChecker 检查是否使用While循环
<check enabled="true" class="org.scalastyle.scalariform.WhileChecker" level="warning"/>
org.scalastyle.scalariform.XmlLiteralChecker 检查是否未使用xml文本
<check enabled="true" class="org.scalastyle.scalariform.XmlLiteralChecker" level="warning"/>
Maven集成Scalastyle
如Spark的pom.xml中集成Scalastyle。
<build>
<plugins>
...
<plugin>
<groupId>org.scalastyle</groupId>
<artifactId>scalastyle-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>
<verbose>false</verbose>
<failOnViolation>true</failOnViolation>
<includeTestSourceDirectory>false</includeTestSourceDirectory>
<failOnWarning>false</failOnWarning>
<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
<configLocation>scalastyle-config.xml</configLocation>
<outputFile>${basedir}/target/scalastyle-output.xml</outputFile>
<inputEncoding>${project.build.sourceEncoding}</inputEncoding>
<outputEncoding>${project.reporting.outputEncoding}</outputEncoding>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
...
</plugins>
</build>
也可以将<sourceDirectories>设置多个目录。
<sourceDirectories>
<dir>${project.basedir}/src/main/scala</dir>
<dir>${project.basedir}/src/main/generated-scala</dir>
</sourceDirectories>
IDEA下可以设置风格检测
Spark2.4.3 的 Scalastyle-config.xml
If you wish to turn off checking for a section of code, you can put a comment in the source
before and after the section, with the following syntax:
// scalastyle:off
... // stuff that breaks the styles
// scalastyle:on
You can also disable only one rule, by specifying its rule id, as specified in:
http://www.scalastyle.org/rules-0.7.0.html
// scalastyle:off no.finalize
override def finalize(): Unit = ...
// scalastyle:on no.finalize
This file is divided into 3 sections:
(1) rules that we enforce.
(2) rules that we would like to enforce, but haven't cleaned up the codebase to turn on yet
(or we need to make the scalastyle rule more configurable).
(3) rules that we don't want to enforce.
-->
<scalastyle>
<name>Scalastyle standard configuration</name>
<!-- ================================================================================ -->
<!-- rules we enforce -->
<!-- ================================================================================ -->
<check level="error" class="org.scalastyle.file.FileTabChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.HeaderMatchesChecker" enabled="true">
<parameters>
<parameter name="header"><![CDATA[/*
* 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
* limitations under the License.
*/]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.WhitespaceEndOfLineChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.FileLineLengthChecker" enabled="true">
<parameters>
<parameter name="maxLineLength"><![CDATA[100]]></parameter>
<parameter name="tabSize"><![CDATA[2]]></parameter>
<parameter name="ignoreImports">true</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.ClassNamesChecker" enabled="true">
<parameters><parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter></parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.ObjectNamesChecker" enabled="true">
<parameters><parameter name="regex"><![CDATA[(config|[A-Z][A-Za-z]*)]]></parameter></parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.PackageObjectNamesChecker" enabled="true">
<parameters><parameter name="regex"><![CDATA[^[a-z][A-Za-z]*$]]></parameter></parameters>
</check>
<check customId="argcount" level="error" class="org.scalastyle.scalariform.ParameterNumberChecker" enabled="true">
<parameters><parameter name="maxParameters"><![CDATA[10]]></parameter></parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.NoFinalizeChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.CovariantEqualsChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.StructuralTypeChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.UppercaseLChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.IfBraceChecker" enabled="true">
<parameters>
<parameter name="singleLineAllowed"><![CDATA[true]]></parameter>
<parameter name="doubleLineAllowed"><![CDATA[true]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.NewLineAtEofChecker" enabled="true"></check>
<check customId="nonascii" level="error" class="org.scalastyle.scalariform.NonASCIICharacterChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.SpaceAfterCommentStartChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.EnsureSingleSpaceBeforeTokenChecker" enabled="true">
<parameters>
<parameter name="tokens">ARROW, EQUALS, ELSE, TRY, CATCH, FINALLY, LARROW, RARROW</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.EnsureSingleSpaceAfterTokenChecker" enabled="true">
<parameters>
<parameter name="tokens">ARROW, EQUALS, COMMA, COLON, IF, ELSE, DO, WHILE, FOR, MATCH, TRY, CATCH, FINALLY, LARROW, RARROW</parameter>
</parameters>
</check>
<!-- ??? usually shouldn't be checked into the code base. -->
<check level="error" class="org.scalastyle.scalariform.NotImplementedErrorUsage" enabled="true"></check>
<!-- As of SPARK-7558, all tests in Spark should extend o.a.s.SparkFunSuite instead of FunSuite directly -->
<check customId="funsuite" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">^FunSuite[A-Za-z]*$</parameter></parameters>
<customMessage>Tests must extend org.apache.spark.SparkFunSuite instead.</customMessage>
</check>
<!-- As of SPARK-7977 all printlns need to be wrapped in '// scalastyle:off/on println' -->
<check customId="println" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">^println$</parameter></parameters>
<customMessage><![CDATA[Are you sure you want to println? If yes, wrap the code block with
// scalastyle:off println
println(...)
// scalastyle:on println]]></customMessage>
</check>
<check customId="hadoopconfiguration" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">spark(.sqlContext)?.sparkContext.hadoopConfiguration</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use sparkContext.hadoopConfiguration? In most cases, you should use
spark.sessionState.newHadoopConf() instead, so that the hadoop configurations specified in Spark session
configuration will come into effect.
If you must use sparkContext.hadoopConfiguration, wrap the code block with
// scalastyle:off hadoopconfiguration
spark.sparkContext.hadoopConfiguration...
// scalastyle:on hadoopconfiguration
]]></customMessage>
</check>
<check customId="visiblefortesting" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">@VisibleForTesting</parameter></parameters>
<customMessage><![CDATA[
@VisibleForTesting causes classpath issues. Please note this in the java doc instead (SPARK-11615).
]]></customMessage>
</check>
<check customId="runtimeaddshutdownhook" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Runtime\.getRuntime\.addShutdownHook</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Runtime.getRuntime.addShutdownHook? In most cases, you should use
ShutdownHookManager.addShutdownHook instead.
If you must use Runtime.getRuntime.addShutdownHook, wrap the code block with
// scalastyle:off runtimeaddshutdownhook
Runtime.getRuntime.addShutdownHook(...)
// scalastyle:on runtimeaddshutdownhook
]]></customMessage>
</check>
<check customId="mutablesynchronizedbuffer" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">mutable\.SynchronizedBuffer</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use mutable.SynchronizedBuffer? In most cases, you should use
java.util.concurrent.ConcurrentLinkedQueue instead.
If you must use mutable.SynchronizedBuffer, wrap the code block with
// scalastyle:off mutablesynchronizedbuffer
mutable.SynchronizedBuffer[...]
// scalastyle:on mutablesynchronizedbuffer
]]></customMessage>
</check>
<check customId="classforname" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Class\.forName</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Class.forName? In most cases, you should use Utils.classForName instead.
If you must use Class.forName, wrap the code block with
// scalastyle:off classforname
Class.forName(...)
// scalastyle:on classforname
]]></customMessage>
</check>
<check customId="awaitresult" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Await\.result</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Await.result? In most cases, you should use ThreadUtils.awaitResult instead.
If you must use Await.result, wrap the code block with
// scalastyle:off awaitresult
Await.result(...)
// scalastyle:on awaitresult
]]></customMessage>
</check>
<check customId="awaitready" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Await\.ready</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Await.ready? In most cases, you should use ThreadUtils.awaitReady instead.
If you must use Await.ready, wrap the code block with
// scalastyle:off awaitready
Await.ready(...)
// scalastyle:on awaitready
]]></customMessage>
</check>
<!-- As of SPARK-9613 JavaConversions should be replaced with JavaConverters -->
<check customId="javaconversions" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">JavaConversions</parameter></parameters>
<customMessage>Instead of importing implicits in scala.collection.JavaConversions._, import
scala.collection.JavaConverters._ and use .asScala / .asJava methods</customMessage>
</check>
<check customId="commonslang2" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">org\.apache\.commons\.lang\.</parameter></parameters>
<customMessage>Use Commons Lang 3 classes (package org.apache.commons.lang3.*) instead
of Commons Lang 2 (package org.apache.commons.lang.*)</customMessage>
</check>
<check customId="extractopt" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">extractOpt</parameter></parameters>
<customMessage>Use jsonOption(x).map(.extract[T]) instead of .extractOpt[T], as the latter
is slower. </customMessage>
</check>
<check level="error" class="org.scalastyle.scalariform.ImportOrderChecker" enabled="true">
<parameters>
<parameter name="groups">java,scala,3rdParty,spark</parameter>
<parameter name="group.java">javax?\..*</parameter>
<parameter name="group.scala">scala\..*</parameter>
<parameter name="group.3rdParty">(?!org\.apache\.spark\.).*</parameter>
<parameter name="group.spark">org\.apache\.spark\..*</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.DisallowSpaceBeforeTokenChecker" enabled="true">
<parameters>
<parameter name="tokens">COMMA</parameter>
</parameters>
</check>
<!-- SPARK-3854: Single Space between ')' and '{' -->
<check customId="SingleSpaceBetweenRParenAndLCurlyBrace" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">\)\{</parameter></parameters>
<customMessage><![CDATA[
Single Space between ')' and `{`.
]]></customMessage>
</check>
<check customId="NoScalaDoc" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">(?m)^(\s*)/[*][*].*$(\r|)\n^\1 [*]</parameter></parameters>
<customMessage>Use Javadoc style indentation for multiline comments</customMessage>
</check>
<check customId="OmitBracesInCase" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">case[^\n>]*=>\s*\{</parameter></parameters>
<customMessage>Omit braces in case clauses.</customMessage>
</check>
<!-- SPARK-16877: Avoid Java annotations -->
<check level="error" class="org.scalastyle.scalariform.OverrideJavaChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.DeprecatedJavaChecker" enabled="true"></check>
<!-- ================================================================================ -->
<!-- rules we'd like to enforce, but haven't cleaned up the codebase yet -->
<!-- ================================================================================ -->
<!-- We cannot turn the following two on, because it'd fail a lot of string interpolation use cases. -->
<!-- Ideally the following two rules should be configurable to rule out string interpolation. -->
<check level="error" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" enabled="false"></check>
<check level="error" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" enabled="false"></check>
<!-- This breaks symbolic method names so we don't turn it on. -->
<!-- Maybe we should update it to allow basic symbolic names, and then we are good to go. -->
<check level="error" class="org.scalastyle.scalariform.MethodNamesChecker" enabled="false">
<parameters>
<parameter name="regex"><![CDATA[^[a-z][A-Za-z0-9]*$]]></parameter>
</parameters>
</check>
<!-- Should turn this on, but we have a few places that need to be fixed first -->
<check level="error" class="org.scalastyle.scalariform.EqualsHashCodeChecker" enabled="true"></check>
<!-- ================================================================================ -->
<!-- rules we don't want -->
<!-- ================================================================================ -->
<check level="error" class="org.scalastyle.scalariform.IllegalImportsChecker" enabled="false">
<parameters><parameter name="illegalImports"><![CDATA[sun._,java.awt._]]></parameter></parameters>
</check>
<!-- We want the opposite of this: NewLineAtEofChecker -->
<check level="error" class="org.scalastyle.file.NoNewLineAtEofChecker" enabled="false"></check>
<!-- This one complains about all kinds of random things. Disable. -->
<check level="error" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" enabled="false"></check>
<!-- We use return quite a bit for control flows and guards -->
<check level="error" class="org.scalastyle.scalariform.ReturnChecker" enabled="false"></check>
<!-- We use null a lot in low level code and to interface with 3rd party code -->
<check level="error" class="org.scalastyle.scalariform.NullChecker" enabled="false"></check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.NoCloneChecker" enabled="false"></check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.file.FileLengthChecker" enabled="false">
<parameters><parameter name="maxFileLength">800></parameter></parameters>
</check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.NumberOfTypesChecker" enabled="false">
<parameters><parameter name="maxTypes">30</parameter></parameters>
</check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" enabled="false">
<parameters><parameter name="maximum">10</parameter></parameters>
</check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.MethodLengthChecker" enabled="false">
<parameters><parameter name="maxLength">50</parameter></parameters>
</check>
<!-- Not exactly feasible to enforce this right now. -->
<!-- It is also infrequent that somebody introduces a new class with a lot of methods. -->
<check level="error" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" enabled="false">
<parameters><parameter name="maxMethods"><![CDATA[30]]></parameter></parameters>
</check>
<!-- Doesn't seem super big deal here, and we have a lot of magic numbers ... -->
<check level="error" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="false">
<parameters><parameter name="ignore">-1,0,1,2,3</parameter></parameters>
</check>
</scalastyle>
记录下Scalastyle规则，方便查询。内容比较多，使用Ctrl + F 输入需要查询的检查器进行搜索查询。
目录
介绍
Scalastyle 是专门针对Scala代码开发的轻巧的code style检测工具，类似于Java代码检查工具Checkstyle、Findbugs等。可以在Maven中集成到项目中，方便代码风格的检测。
最下面附上了Spark2.4.3的 Scalastyle 配置代码，可以借鉴。
Scalastyle常用关键字 //scalastyle:on 和 //scalastyle:off，如：
//scalastyle:on println
if (args.length < 2) {
println("Usage:")
println("DRIVER_MEMORY=[mem] spark-submit " +
"com.github.ehiggs.spark.terasort.TeraGen " +
"spark-terasort-1.0-SNAPSHOT-with-dependencies.jar " +
"[output-size] [output-directory]")
println(" ")
println("Example:")
println("DRIVER_MEMORY=50g spark-submit " +
"com.github.ehiggs.spark.terasort.TeraGen " +
"spark-terasort-1.0-SNAPSHOT-with-dependencies.jar " +
"100G file:///scratch/username/terasort_in")
System.exit(0)
}
//scalastyle:off println
规则
官网说明：已实现的规则
目前已实现规则有69条
使用示例
主要在 scalastyle-config.xml 中设置。
org.scalastyle.file.FileLengthChecker 检查文件中的行数
<check enabled="true" class="org.scalastyle.file.FileLengthChecker" level="warning">
<parameters>
<parameter name="maxFileLength">800</parameter>
</parameters>
</check>
org.scalastyle.file.FileLineLengthChecker 检查一行中的字符数
<check enabled="true" class="org.scalastyle.file.FileLineLengthChecker" level="warning">
<parameters>
<parameter name="maxLineLength">100</parameter>
<parameter name="tabSize">2</parameter>
<parameter name="ignoreImports">true</parameter>
</parameters>
</check>
org.scalastyle.file.FileTabChecker 检查文件中是否有标签
<check enabled="true" class="org.scalastyle.file.FileTabChecker" level="warning"/>
org.scalastyle.file.HeaderMatchesChecker 检查每个文件的前几行与文本匹配
<check enabled="true" class="org.scalastyle.file.HeaderMatchesChecker" level="warning">
<parameters>
<parameter name="regex">false</parameter>
<parameter name="header">// Copyright \(C\) 2011-2012 the original author or authors.</parameter>
</parameters>
</check>
或者
<check enabled="true" class="org.scalastyle.file.HeaderMatchesChecker" level="warning">
<parameters>
<parameter name="regex">true</parameter>
<parameter name="header">// Copyright \(C\) (?:\d{4}-)?\d{4} the original author or authors.</parameter>
</parameters>
</check>
org.scalastyle.file.IndentationChecker 检查行是否由Tab的倍数缩进
<check enabled="true" class="org.scalastyle.file.IndentationChecker" level="warning">
<parameters>
<parameter name="tabSize">2</parameter>
<parameter name="methodParamIndentSize">2</parameter>
<parameter name="classParamIndentSize">4</parameter>
</parameters>
</check>
org.scalastyle.file.NewLineAtEofChecker 检查文件是否以换行符结尾
<check enabled="true" class="org.scalastyle.file.NewLineAtEofChecker" level="warning"/>
org.scalastyle.file.NoNewLineAtEofChecker 检查文件不是以换行符结尾
<check enabled="true" class="org.scalastyle.file.NoNewLineAtEofChecker" level="warning"/>
org.scalastyle.file.RegexChecker 检查正则表达式是否匹配
<check enabled="true" class="org.scalastyle.file.RegexChecker" level="warning">
<parameters>
<parameter name="regex">(?m)^\s*$(\r|)\n^\s*$(\r|)\n</parameter>
<parameter name="line">false</parameter>
</parameters>
<customMessage>No double blank lines</customMessage>
</check>
org.scalastyle.file.WhitespaceEndOfLineChecker 检查行尾没有空格
<check enabled="true" class="org.scalastyle.file.WhitespaceEndOfLineChecker" level="warning">
<parameters>
<parameter default="false" type="boolean" name="ignoreWhitespaceLines"/>
</parameters>
</check>
org.scalastyle.scalariform.BlockImportChecker 检查导入块是否使用
<check enabled="true" class="org.scalastyle.scalariform.BlockImportChecker" level="warning"/>
org.scalastyle.scalariform.ClassNamesChecker 检查类名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.ClassNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ClassTypeParameterChecker 检查类的类型参数与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.ClassTypeParameterChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Z_]$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.CovariantEqualsChecker 检查类和对象在没有覆盖的情况下定义了相等(java.lang.object)
<check enabled="true" class="org.scalastyle.scalariform.CovariantEqualsChecker" level="warning"/>
org.scalastyle.scalariform.CyclomaticComplexityChecker 检查方法的参数复杂度是否超过设定值
<check enabled="true" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" level="warning">
<parameters>
<parameter name="maximum">10</parameter>
<parameter name="countCases">true</parameter>
</parameters>
</check>
org.scalastyle.scalariform.DeprecatedJavaChecker 检查应该用Scala @deprecated代替Java @Deprecated
<check enabled="true" class="org.scalastyle.scalariform.DeprecatedJavaChecker" level="warning"/>
org.scalastyle.scalariform.DisallowSpaceAfterTokenChecker 检查某些既定标记后不允许使用空格
<check enabled="true" class="org.scalastyle.scalariform.DisallowSpaceAfterTokenChecker" level="warning">
<parameters>
<parameter name="tokens">LPAREN</parameter>
</parameters>
</check>
org.scalastyle.scalariform.DisallowSpaceBeforeTokenChecker 检查某些既定标记前不允许使用空格
<check enabled="true" class="org.scalastyle.scalariform.DisallowSpaceBeforeTokenChecker" level="warning">
<parameters>
<parameter name="tokens">COLON, COMMA, RPAREN</parameter>
</parameters>
</check>
org.scalastyle.scalariform.EmptyClassChecker 检查类或抽象类没有成员，则可以省略大括号
<check enabled="true" class="org.scalastyle.scalariform.EmptyClassChecker" level="warning"/>
org.scalastyle.scalariform.EmptyInterpolatedStringChecker 检查是否有对字符串插入空值
<check enabled="true" level="warning" class="org.scalastyle.scalariform.EmptyInterpolatedStringChecker"/>
org.scalastyle.scalariform.EnsureSingleSpaceAfterTokenChecker 检查某些既定标记后是否有空间
<check enabled="true" class="org.scalastyle.scalariform.EnsureSingleSpaceAfterTokenChecker" level="warning">
<parameters>
<parameter name="tokens">COLON, IF</parameter>
</parameters>
</check>
org.scalastyle.scalariform.EnsureSingleSpaceBeforeTokenChecker 检查某些既定标记前是否有空间
<check enabled="true" class="org.scalastyle.scalariform.EnsureSingleSpaceBeforeTokenChecker" level="warning">
<parameters>
<parameter name="tokens">LPAREN</parameter>
</parameters>
</check>
org.scalastyle.scalariform.EqualsHashCodeChecker 检查如果一个类实现了或等于Hash，那它应该实现另一个类
<check enabled="true" class="org.scalastyle.scalariform.EqualsHashCodeChecker" level="warning"/>
org.scalastyle.scalariform.FieldNamesChecker 检查字段名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.FieldNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z0-9]*$</parameter>
<parameter name="objectFieldRegex">^[A-Z][A-Za-z0-9]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ForBraceChecker 检查for是否使用大括号
<check enabled="true" class="org.scalastyle.scalariform.ForBraceChecker" level="warning"/>
org.scalastyle.scalariform.IfBraceChecker 检查if是否使用大括号
<check enabled="true" class="org.scalastyle.scalariform.IfBraceChecker" level="warning">
<parameters>
<parameter name="singleLineAllowed">true</parameter>
<parameter name="doubleLineAllowed">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.IllegalImportsChecker 检查类没有导入某些类
<check enabled="true" class="org.scalastyle.scalariform.IllegalImportsChecker" level="warning"/>
org.scalastyle.scalariform.ImportGroupingChecker 检查导入是否分组
<check enabled="true" class="org.scalastyle.scalariform.ImportGroupingChecker" level="warning"/>
org.scalastyle.scalariform.ImportOrderChecker 检查是否根据样式配置对导入进行分组和排序
<check enabled="true" class="org.scalastyle.scalariform.ImportOrderChecker" level="warning">
<parameters>
<parameter name="groups">java,scala,others</parameter>
<parameter name="group.java">javax?\..+</parameter>
<parameter name="group.scala">scala\..+</parameter>
<parameter name="group.others">.+</parameter>
</parameters>
</check>
org.scalastyle.scalariform.LowercasePatternMatchChecker 检查case语句模式匹配是否为小写，因为这可能导致混淆
<check enabled="true" class="org.scalastyle.scalariform.LowercasePatternMatchChecker" level="warning"/>
org.scalastyle.scalariform.MagicNumberChecker 检查魔数是否使用var定义
<check enabled="true" class="org.scalastyle.scalariform.MagicNumberChecker" level="warning">
<parameters>
<parameter name="ignore">-1,0,1,2,3</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MethodArgumentNamesChecker 检查方法参数名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.MethodArgumentNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z0-9]*$</parameter>
<parameter name="ignoreRegex">^$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MethodLengthChecker 检查方法不超过最大长度
<check enabled="true" class="org.scalastyle.scalariform.MethodLengthChecker" level="warning">
<parameters>
<parameter name="maxLength">50</parameter>
<parameter name="ignoreComments">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MethodNamesChecker 检查方法名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.MethodNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Za-z]*$</parameter>
<parameter name="ignoreRegex">^.*$</parameter>
<parameter name="ignoreOverride">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.MultipleStringLiteralsChecker 检查字符串文字没有多次出现
<check enabled="true" class="org.scalastyle.scalariform.MultipleStringLiteralsChecker" level="warning">
<parameters>
<parameter name="allowed">1</parameter>
<parameter name="ignoreRegex">^\"\"$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NamedArgumentChecker 检查参数是否命名
<check enabled="true" class="org.scalastyle.scalariform.NamedArgumentChecker" level="warning">
<parameters>
<parameter name="checkString">false</parameter>
<parameter name="ignoreMethod">^set.+$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NoCloneChecker 检查类和对象没有定义clone()方法
<check enabled="true" class="org.scalastyle.scalariform.NoCloneChecker" level="warning"/>
org.scalastyle.scalariform.NoFinalizeChecker 检查类和对象是否定义了Finish()方法
<check enabled="true" class="org.scalastyle.scalariform.NoFinalizeChecker" level="warning"/>
org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker 检查左括号‘[’后没有空格
<check enabled="true" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" level="warning"/>
org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker 检查左括号‘[’之前没有空格
<check enabled="true" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" level="warning"/>
org.scalastyle.scalariform.NoWhitespaceBeforeRightBracketChecker 检查右括号“]”之前没有空格
<check enabled="true" class="org.scalastyle.scalariform.NoWhitespaceBeforeRightBracketChecker" level="warning"/>
org.scalastyle.scalariform.NonASCIICharacterChecker 检查是否使用非ASCII字符（Unicode字符）
<check enabled="true" class="org.scalastyle.scalariform.NonASCIICharacterChecker" level="warning"/>
org.scalastyle.scalariform.NotImplementedErrorUsage 检查代码是否有 ??? 操作符
<check enabled="true" class="org.scalastyle.scalariform.NotImplementedErrorUsage" level="warning"/>
org.scalastyle.scalariform.NullChecker 检查是否使用NULL
<check enabled="true" class="org.scalastyle.scalariform.NullChecker" level="warning">
<parameters>
<parameter name="allowNullChecks">true</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NumberOfMethodsInTypeChecker 检查一个类/特性/对象是否申明太多的方法
<check enabled="true" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" level="warning">
<parameters>
<parameter name="maxMethods">30</parameter>
</parameters>
</check>
org.scalastyle.scalariform.NumberOfTypesChecker 检查文件中声明的类型是否过多
<check enabled="true" class="org.scalastyle.scalariform.NumberOfTypesChecker" level="warning">
<parameters>
<parameter name="maxTypes">20</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ObjectNamesChecker 检查对象名称是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.ObjectNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[A-Z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.OverrideJavaChecker 检查java@重写是否被使用
<check enabled="true" class="org.scalastyle.scalariform.OverrideJavaChecker" level="warning"/>
org.scalastyle.scalariform.PackageNamesChecker 检查包名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.PackageNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.PackageObjectNamesChecker 检查包对象名是否与正则表达式匹配
<check enabled="true" class="org.scalastyle.scalariform.PackageObjectNamesChecker" level="warning">
<parameters>
<parameter name="regex">^[a-z][A-Za-z]*$</parameter>
</parameters>
</check>
org.scalastyle.scalariform.ParameterNumberChecker 检查方法的参数个数是否超过设置数量
<check enabled="true" class="org.scalastyle.scalariform.ParameterNumberChecker" level="warning">
<parameters>
<parameter name="maxParameters">8</parameter>
</parameters>
</check>
org.scalastyle.scalariform.PatternMatchAlignChecker 检查模式匹配箭头对齐
<check enabled="true" class="org.scalastyle.scalariform.PatternMatchAlignChecker" level="warning"/>
org.scalastyle.scalariform.ProcedureDeclarationChecker 检查申明过程 a：unit= 是否使用=号
<check enabled="true" class="org.scalastyle.scalariform.ProcedureDeclarationChecker" level="warning"/>
org.scalastyle.scalariform.PublicMethodsHaveTypeChecker 检查方法是否具有显式返回类型
<check enabled="true" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" level="warning">
<parameters>
<parameter name="ignoreOverride">false</parameter>
</parameters>
</check>
org.scalastyle.scalariform.RedundantIfChecker 检查表达式是否是冗余，如，if (cond) false else true
<check enabled="true" class="org.scalastyle.scalariform.RedundantIfChecker" level="warning"/>
org.scalastyle.scalariform.ReturnChecker 检查是否使用return
<check enabled="true" class="org.scalastyle.scalariform.ReturnChecker" level="warning"/>
org.scalastyle.scalariform.ScalaDocChecker 检查代码格式是否遵循Scaladoc文档说明
<check enabled="true" class="org.scalastyle.scalariform.ScalaDocChecker" level="warning">
<parameters>
<parameter name="ignoreRegex">(.*Spec$)|(.*SpecIT$)</parameter>
<parameter name="ignoreTokenTypes">PatDefOrDcl,TypeDefOrDcl,FunDefOrDcl,TmplDef</parameter>
<parameter name="ignoreOverride">false</parameter>
<parameter name="indentStyle">anydoc</parameter>
</parameters>
</check>
org.scalastyle.scalariform.SimplifyBooleanExpressionChecker 检查Boolean表达式是否可以简化
<check enabled="true" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" level="warning"/>
org.scalastyle.scalariform.SpaceAfterCommentStartChecker 检查在注释后是否有一个空格
<check enabled="true" class="org.scalastyle.scalariform.SpaceAfterCommentStartChecker" level="warning"/>
org.scalastyle.scalariform.SpacesAfterPlusChecker 检查加号后面是否有空格
<check enabled="true" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" level="warning"/>
org.scalastyle.scalariform.SpacesBeforePlusChecker 检查加号前面是否有空格
<check enabled="true" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" level="warning"/>
org.scalastyle.scalariform.StructuralTypeChecker 检查结构类型是否未被使用
<check enabled="true" class="org.scalastyle.scalariform.StructuralTypeChecker" level="warning"/>
org.scalastyle.scalariform.TodoCommentChecker 检查是否使用Todo/Fixme单行注释
<check enabled="true" class="org.scalastyle.scalariform.TodoCommentChecker" level="warning">
<parameters>
<parameter default="TODO|FIXME" type="string" name="words"/>
</parameters>
</check>
org.scalastyle.scalariform.TokenChecker 检查如果有正则表达式，是否在特殊标记中匹配
<check enabled="true" class="org.scalastyle.scalariform.TokenChecker" level="warning">
<parameters>
<parameter name="regex">^[ai]sInstanceOf$</parameter>
</parameters>
<customMessage>Avoid casting.</customMessage>
</check>
org.scalastyle.scalariform.UnderscoreImportChecker 检查是否使用通配符导入
<check enabled="true" class="org.scalastyle.scalariform.UnderscoreImportChecker" level="warning">
<parameters>
<parameter name="ignoreRegex">collection\.JavaConverters\._|scala\.concurrent\.duration\._</parameter>
</parameters>
</check>
org.scalastyle.scalariform.UppercaseLChecker 检查如果使用长字符串，则使用大写字母
<check enabled="true" class="org.scalastyle.scalariform.UppercaseLChecker" level="warning"/>
org.scalastyle.scalariform.VarFieldChecker 检查类和对象是否定义可变字段
<check enabled="true" class="org.scalastyle.scalariform.VarFieldChecker" level="warning"/>
org.scalastyle.scalariform.VarLocalChecker 检查函数是否定义可变变量
<check enabled="true" class="org.scalastyle.scalariform.VarLocalChecker" level="warning"/>
org.scalastyle.scalariform.WhileChecker 检查是否使用While循环
<check enabled="true" class="org.scalastyle.scalariform.WhileChecker" level="warning"/>
org.scalastyle.scalariform.XmlLiteralChecker 检查是否未使用xml文本
<check enabled="true" class="org.scalastyle.scalariform.XmlLiteralChecker" level="warning"/>
Maven集成Scalastyle
如Spark的pom.xml中集成Scalastyle。
<build>
<plugins>
...
<plugin>
<groupId>org.scalastyle</groupId>
<artifactId>scalastyle-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>
<verbose>false</verbose>
<failOnViolation>true</failOnViolation>
<includeTestSourceDirectory>false</includeTestSourceDirectory>
<failOnWarning>false</failOnWarning>
<sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
<testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
<configLocation>scalastyle-config.xml</configLocation>
<outputFile>${basedir}/target/scalastyle-output.xml</outputFile>
<inputEncoding>${project.build.sourceEncoding}</inputEncoding>
<outputEncoding>${project.reporting.outputEncoding}</outputEncoding>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
...
</plugins>
</build>
也可以将<sourceDirectories>设置多个目录。
<sourceDirectories>
<dir>${project.basedir}/src/main/scala</dir>
<dir>${project.basedir}/src/main/generated-scala</dir>
</sourceDirectories>
IDEA下可以设置风格检测
Spark2.4.3 的 Scalastyle-config.xml
If you wish to turn off checking for a section of code, you can put a comment in the source
before and after the section, with the following syntax:
// scalastyle:off
... // stuff that breaks the styles
// scalastyle:on
You can also disable only one rule, by specifying its rule id, as specified in:
http://www.scalastyle.org/rules-0.7.0.html
// scalastyle:off no.finalize
override def finalize(): Unit = ...
// scalastyle:on no.finalize
This file is divided into 3 sections:
(1) rules that we enforce.
(2) rules that we would like to enforce, but haven't cleaned up the codebase to turn on yet
(or we need to make the scalastyle rule more configurable).
(3) rules that we don't want to enforce.
-->
<scalastyle>
<name>Scalastyle standard configuration</name>
<!-- ================================================================================ -->
<!-- rules we enforce -->
<!-- ================================================================================ -->
<check level="error" class="org.scalastyle.file.FileTabChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.HeaderMatchesChecker" enabled="true">
<parameters>
<parameter name="header"><![CDATA[/*
* 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
* limitations under the License.
*/]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.WhitespaceEndOfLineChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.FileLineLengthChecker" enabled="true">
<parameters>
<parameter name="maxLineLength"><![CDATA[100]]></parameter>
<parameter name="tabSize"><![CDATA[2]]></parameter>
<parameter name="ignoreImports">true</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.ClassNamesChecker" enabled="true">
<parameters><parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter></parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.ObjectNamesChecker" enabled="true">
<parameters><parameter name="regex"><![CDATA[(config|[A-Z][A-Za-z]*)]]></parameter></parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.PackageObjectNamesChecker" enabled="true">
<parameters><parameter name="regex"><![CDATA[^[a-z][A-Za-z]*$]]></parameter></parameters>
</check>
<check customId="argcount" level="error" class="org.scalastyle.scalariform.ParameterNumberChecker" enabled="true">
<parameters><parameter name="maxParameters"><![CDATA[10]]></parameter></parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.NoFinalizeChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.CovariantEqualsChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.StructuralTypeChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.UppercaseLChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.IfBraceChecker" enabled="true">
<parameters>
<parameter name="singleLineAllowed"><![CDATA[true]]></parameter>
<parameter name="doubleLineAllowed"><![CDATA[true]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.NewLineAtEofChecker" enabled="true"></check>
<check customId="nonascii" level="error" class="org.scalastyle.scalariform.NonASCIICharacterChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.SpaceAfterCommentStartChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.EnsureSingleSpaceBeforeTokenChecker" enabled="true">
<parameters>
<parameter name="tokens">ARROW, EQUALS, ELSE, TRY, CATCH, FINALLY, LARROW, RARROW</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.EnsureSingleSpaceAfterTokenChecker" enabled="true">
<parameters>
<parameter name="tokens">ARROW, EQUALS, COMMA, COLON, IF, ELSE, DO, WHILE, FOR, MATCH, TRY, CATCH, FINALLY, LARROW, RARROW</parameter>
</parameters>
</check>
<!-- ??? usually shouldn't be checked into the code base. -->
<check level="error" class="org.scalastyle.scalariform.NotImplementedErrorUsage" enabled="true"></check>
<!-- As of SPARK-7558, all tests in Spark should extend o.a.s.SparkFunSuite instead of FunSuite directly -->
<check customId="funsuite" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">^FunSuite[A-Za-z]*$</parameter></parameters>
<customMessage>Tests must extend org.apache.spark.SparkFunSuite instead.</customMessage>
</check>
<!-- As of SPARK-7977 all printlns need to be wrapped in '// scalastyle:off/on println' -->
<check customId="println" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">^println$</parameter></parameters>
<customMessage><![CDATA[Are you sure you want to println? If yes, wrap the code block with
// scalastyle:off println
println(...)
// scalastyle:on println]]></customMessage>
</check>
<check customId="hadoopconfiguration" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">spark(.sqlContext)?.sparkContext.hadoopConfiguration</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use sparkContext.hadoopConfiguration? In most cases, you should use
spark.sessionState.newHadoopConf() instead, so that the hadoop configurations specified in Spark session
configuration will come into effect.
If you must use sparkContext.hadoopConfiguration, wrap the code block with
// scalastyle:off hadoopconfiguration
spark.sparkContext.hadoopConfiguration...
// scalastyle:on hadoopconfiguration
]]></customMessage>
</check>
<check customId="visiblefortesting" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">@VisibleForTesting</parameter></parameters>
<customMessage><![CDATA[
@VisibleForTesting causes classpath issues. Please note this in the java doc instead (SPARK-11615).
]]></customMessage>
</check>
<check customId="runtimeaddshutdownhook" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Runtime\.getRuntime\.addShutdownHook</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Runtime.getRuntime.addShutdownHook? In most cases, you should use
ShutdownHookManager.addShutdownHook instead.
If you must use Runtime.getRuntime.addShutdownHook, wrap the code block with
// scalastyle:off runtimeaddshutdownhook
Runtime.getRuntime.addShutdownHook(...)
// scalastyle:on runtimeaddshutdownhook
]]></customMessage>
</check>
<check customId="mutablesynchronizedbuffer" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">mutable\.SynchronizedBuffer</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use mutable.SynchronizedBuffer? In most cases, you should use
java.util.concurrent.ConcurrentLinkedQueue instead.
If you must use mutable.SynchronizedBuffer, wrap the code block with
// scalastyle:off mutablesynchronizedbuffer
mutable.SynchronizedBuffer[...]
// scalastyle:on mutablesynchronizedbuffer
]]></customMessage>
</check>
<check customId="classforname" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Class\.forName</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Class.forName? In most cases, you should use Utils.classForName instead.
If you must use Class.forName, wrap the code block with
// scalastyle:off classforname
Class.forName(...)
// scalastyle:on classforname
]]></customMessage>
</check>
<check customId="awaitresult" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Await\.result</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Await.result? In most cases, you should use ThreadUtils.awaitResult instead.
If you must use Await.result, wrap the code block with
// scalastyle:off awaitresult
Await.result(...)
// scalastyle:on awaitresult
]]></customMessage>
</check>
<check customId="awaitready" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">Await\.ready</parameter></parameters>
<customMessage><![CDATA[
Are you sure that you want to use Await.ready? In most cases, you should use ThreadUtils.awaitReady instead.
If you must use Await.ready, wrap the code block with
// scalastyle:off awaitready
Await.ready(...)
// scalastyle:on awaitready
]]></customMessage>
</check>
<!-- As of SPARK-9613 JavaConversions should be replaced with JavaConverters -->
<check customId="javaconversions" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">JavaConversions</parameter></parameters>
<customMessage>Instead of importing implicits in scala.collection.JavaConversions._, import
scala.collection.JavaConverters._ and use .asScala / .asJava methods</customMessage>
</check>
<check customId="commonslang2" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">org\.apache\.commons\.lang\.</parameter></parameters>
<customMessage>Use Commons Lang 3 classes (package org.apache.commons.lang3.*) instead
of Commons Lang 2 (package org.apache.commons.lang.*)</customMessage>
</check>
<check customId="extractopt" level="error" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
<parameters><parameter name="regex">extractOpt</parameter></parameters>
<customMessage>Use jsonOption(x).map(.extract[T]) instead of .extractOpt[T], as the latter
is slower. </customMessage>
</check>
<check level="error" class="org.scalastyle.scalariform.ImportOrderChecker" enabled="true">
<parameters>
<parameter name="groups">java,scala,3rdParty,spark</parameter>
<parameter name="group.java">javax?\..*</parameter>
<parameter name="group.scala">scala\..*</parameter>
<parameter name="group.3rdParty">(?!org\.apache\.spark\.).*</parameter>
<parameter name="group.spark">org\.apache\.spark\..*</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.DisallowSpaceBeforeTokenChecker" enabled="true">
<parameters>
<parameter name="tokens">COMMA</parameter>
</parameters>
</check>
<!-- SPARK-3854: Single Space between ')' and '{' -->
<check customId="SingleSpaceBetweenRParenAndLCurlyBrace" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">\)\{</parameter></parameters>
<customMessage><![CDATA[
Single Space between ')' and `{`.
]]></customMessage>
</check>
<check customId="NoScalaDoc" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">(?m)^(\s*)/[*][*].*$(\r|)\n^\1 [*]</parameter></parameters>
<customMessage>Use Javadoc style indentation for multiline comments</customMessage>
</check>
<check customId="OmitBracesInCase" level="error" class="org.scalastyle.file.RegexChecker" enabled="true">
<parameters><parameter name="regex">case[^\n>]*=>\s*\{</parameter></parameters>
<customMessage>Omit braces in case clauses.</customMessage>
</check>
<!-- SPARK-16877: Avoid Java annotations -->
<check level="error" class="org.scalastyle.scalariform.OverrideJavaChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.DeprecatedJavaChecker" enabled="true"></check>
<!-- ================================================================================ -->
<!-- rules we'd like to enforce, but haven't cleaned up the codebase yet -->
<!-- ================================================================================ -->
<!-- We cannot turn the following two on, because it'd fail a lot of string interpolation use cases. -->
<!-- Ideally the following two rules should be configurable to rule out string interpolation. -->
<check level="error" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" enabled="false"></check>
<check level="error" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" enabled="false"></check>
<!-- This breaks symbolic method names so we don't turn it on. -->
<!-- Maybe we should update it to allow basic symbolic names, and then we are good to go. -->
<check level="error" class="org.scalastyle.scalariform.MethodNamesChecker" enabled="false">
<parameters>
<parameter name="regex"><![CDATA[^[a-z][A-Za-z0-9]*$]]></parameter>
</parameters>
</check>
<!-- Should turn this on, but we have a few places that need to be fixed first -->
<check level="error" class="org.scalastyle.scalariform.EqualsHashCodeChecker" enabled="true"></check>
<!-- ================================================================================ -->
<!-- rules we don't want -->
<!-- ================================================================================ -->
<check level="error" class="org.scalastyle.scalariform.IllegalImportsChecker" enabled="false">
<parameters><parameter name="illegalImports"><![CDATA[sun._,java.awt._]]></parameter></parameters>
</check>
<!-- We want the opposite of this: NewLineAtEofChecker -->
<check level="error" class="org.scalastyle.file.NoNewLineAtEofChecker" enabled="false"></check>
<!-- This one complains about all kinds of random things. Disable. -->
<check level="error" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" enabled="false"></check>
<!-- We use return quite a bit for control flows and guards -->
<check level="error" class="org.scalastyle.scalariform.ReturnChecker" enabled="false"></check>
<!-- We use null a lot in low level code and to interface with 3rd party code -->
<check level="error" class="org.scalastyle.scalariform.NullChecker" enabled="false"></check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.NoCloneChecker" enabled="false"></check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.file.FileLengthChecker" enabled="false">
<parameters><parameter name="maxFileLength">800></parameter></parameters>
</check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.NumberOfTypesChecker" enabled="false">
<parameters><parameter name="maxTypes">30</parameter></parameters>
</check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" enabled="false">
<parameters><parameter name="maximum">10</parameter></parameters>
</check>
<!-- Doesn't seem super big deal here ... -->
<check level="error" class="org.scalastyle.scalariform.MethodLengthChecker" enabled="false">
<parameters><parameter name="maxLength">50</parameter></parameters>
</check>
<!-- Not exactly feasible to enforce this right now. -->
<!-- It is also infrequent that somebody introduces a new class with a lot of methods. -->
<check level="error" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" enabled="false">
<parameters><parameter name="maxMethods"><![CDATA[30]]></parameter></parameters>
</check>
<!-- Doesn't seem super big deal here, and we have a lot of magic numbers ... -->
<check level="error" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="false">
<parameters><parameter name="ignore">-1,0,1,2,3</parameter></parameters>
</check>
</scalastyle>
来源：CSDN
作者：南宫紫攸
链接：https://blog.csdn.net/weixin_45353054/article/details/103974847