diktat-analysis.yml

# Common configuration
- name: DIKTAT_COMMON
  enabled: true
  configuration:
    # put your package name here - it will be autofixed and checked
    domainName: com.saveourtool.diktat
    # testDirs: test
    # can also use chapter names here (not only numbers)
    # expected values:  disabledChapters: "Naming, Comments, General, Variables, Functions, Classes"
    # or: "1, 2, 3, 4, 5, 6"
    disabledChapters: ""
    testDirs: test
    kotlinVersion: 1.9
    srcDirectories: "main"
# Checks that the Class/Enum/Interface name matches Pascal case
- name: CLASS_NAME_INCORRECT
  enabled: true
# Checks that CONSTANT (treated as const val from companion object or class level) is in non UPPER_SNAKE_CASE
- name: CONSTANT_UPPERCASE
  enabled: true
  configuration:
    exceptionConstNames: "serialVersionUID"
# Checks that enum value is in upper SNAKE_CASE or in PascalCase depending on the config. UPPER_SNAKE_CASE is the default, but can be changed by 'enumStyle' config
- name: ENUM_VALUE
  enabled: true
  configuration:
    # Two options: SNAKE_CASE (default), PascalCase
    enumStyle: SNAKE_CASE
# Checks that class which extends any Exception class has Exception suffix
- name: EXCEPTION_SUFFIX
  enabled: true
# Checks that file name has extension
- name: FILE_NAME_INCORRECT
  enabled: true
# Checks that file name matches class name, if it is only one class in file
- name: FILE_NAME_MATCH_CLASS
  enabled: true
# Checks that functions/methods which return boolean have special prefix like "is/should/e.t.c"
- name: FUNCTION_BOOLEAN_PREFIX
  enabled: true
  configuration:
    allowedPrefixes: "" # A list of functions that return boolean and are allowed to use. Input is in a form "foo, bar".
# Checks that function/method name is in lowerCamelCase
- name: FUNCTION_NAME_INCORRECT_CASE
  enabled: true
# Checks that generic name doesn't contain more than 1 letter (capital). It can be followed by numbers, example: T12, T
- name: GENERIC_NAME
  enabled: true
# Identifier length should be in range [2,64] except names that used in industry like {i, j} and 'e' for catching exceptions
- name: IDENTIFIER_LENGTH
  enabled: true
# Checks that the object matches PascalCase
- name: OBJECT_NAME_INCORRECT
  enabled: true
# Checks that package name is in correct (lower) case
- name: PACKAGE_NAME_INCORRECT_CASE
  enabled: true
# Checks that package name starts with the company's domain
- name: PACKAGE_NAME_INCORRECT_PREFIX
  enabled: true
# Checks that package name does not have incorrect symbols like underscore or non-ASCII letters/digits
- name: PACKAGE_NAME_INCORRECT_SYMBOLS
  enabled: true
# Checks that the path for a file matches with a package name
- name: PACKAGE_NAME_INCORRECT_PATH
  enabled: true
# Checks that package name is in the file
- name: PACKAGE_NAME_MISSING
  enabled: true
# Checks that variable does not have prefix (like mVariable or M_VARIABLE)
- name: VARIABLE_HAS_PREFIX
  enabled: true
# Checks that variable does not contain one single letter, only exceptions are fixed names that used in industry like {i, j}
- name: VARIABLE_NAME_INCORRECT
  enabled: true
# Checks that the name of variable is in lowerCamelCase and contains only ASCII letters
- name: VARIABLE_NAME_INCORRECT_FORMAT
  enabled: true
# Checks that functions have kdoc
- name: MISSING_KDOC_ON_FUNCTION
  enabled: true
# Checks that on file level internal or public class or function has missing KDoc
- name: MISSING_KDOC_TOP_LEVEL
  enabled: true
# Checks that accessible internal elements (protected, public, internal) in a class are documented
- name: MISSING_KDOC_CLASS_ELEMENTS
  enabled: true
# Checks that accessible method parameters are documented in KDoc
- name: KDOC_WITHOUT_PARAM_TAG
  enabled: true
# Checks that accessible method explicit return type is documented in KDoc
- name: KDOC_WITHOUT_RETURN_TAG
  enabled: true
# Checks that accessible method throw keyword is documented in KDoc
- name: KDOC_WITHOUT_THROWS_TAG
  enabled: true
# Checks that KDoc is not empty
- name: KDOC_EMPTY_KDOC
  enabled: true
# Checks that underscore is correctly used to split package naming
- name: INCORRECT_PACKAGE_SEPARATOR
  enabled: true
# Checks that code block doesn't contain kdoc comments
- name: COMMENTED_BY_KDOC
  enabled: true
# Checks that there is no @deprecated tag in kdoc
- name: KDOC_NO_DEPRECATED_TAG
  enabled: true
# Checks that there is no empty content in kdoc tags
- name: KDOC_NO_EMPTY_TAGS
  enabled: true
# Checks that there is only one space after kdoc tag
- name: KDOC_WRONG_SPACES_AFTER_TAG
  enabled: true
# Checks tags order in kDoc. `@param`, `@return`, `@throws`
- name: KDOC_WRONG_TAGS_ORDER
  enabled: true
# Checks that there is no newline of empty KDoc line (with leading asterisk) between `@param`, `@return`, `@throws` tags
- name: KDOC_NO_NEWLINES_BETWEEN_BASIC_TAGS
  enabled: true
# Checks that block of tags @param, @return, @throws is separated from previous part of KDoc by exactly one empty line
- name: KDOC_NEWLINES_BEFORE_BASIC_TAGS
  enabled: true
# Checks that special tags `@apiNote`, `@implNote`, `@implSpec` have exactly one empty line after
- name: KDOC_NO_NEWLINE_AFTER_SPECIAL_TAGS
  enabled: true
# Checks that KDoc does not contain single line with words 'return', 'get' or 'set'
- name: KDOC_TRIVIAL_KDOC_ON_FUNCTION
  enabled: true
# Checks that kdoc does not contain @author tag or date
- name: KDOC_CONTAINS_DATE_OR_AUTHOR
  enabled: true
  configuration:
    versionRegex: \d+\.\d+\.\d+[-.\w\d]*
# Checks that there is newline after header KDoc
- name: HEADER_WRONG_FORMAT
  enabled: true
# Checks that file with zero or >1 classes has header KDoc
- name: HEADER_MISSING_IN_NON_SINGLE_CLASS_FILE
  enabled: true
# Checks that copyright exists on top of file and is properly formatted (as a block comment)
- name: HEADER_MISSING_OR_WRONG_COPYRIGHT
  enabled: true
  configuration:
    isCopyrightMandatory: false
    copyrightText: ''
# Checks that header kdoc is located before package directive
- name: HEADER_NOT_BEFORE_PACKAGE
  enabled: true
# Checks that file does not contain lines > maxSize
- name: FILE_IS_TOO_LONG
  enabled: true
  configuration:
    # number of lines
    maxSize: '2000'
# Checks that file does not contain commented out code
- name: COMMENTED_OUT_CODE
  enabled: true
# Checks that file does not contain only comments, imports and package directive
- name: FILE_CONTAINS_ONLY_COMMENTS
  enabled: true
# Orders imports alphabetically
- name: FILE_UNORDERED_IMPORTS
  enabled: true
  configuration:
    # use logical imports grouping with sorting inside of a group
    useRecommendedImportsOrder: true
# Checks that general order of code parts is right
- name: FILE_INCORRECT_BLOCKS_ORDER
  enabled: true
# Checks that there is exactly one line between code blocks
- name: FILE_NO_BLANK_LINE_BETWEEN_BLOCKS
  enabled: true
# Checks that there is no wildcard imports. Exception: allowedWildcards
- name: FILE_WILDCARD_IMPORTS
  enabled: true
  configuration:
    # Allowed wildcards for imports (e.g. "import com.saveourtool.diktat.*, import org.jetbrains.kotlin.*")
    allowedWildcards: "kotlinx.serialization.*,com.saveourtool.diktat.ruleset.utils.*"
# Checks unused imports
- name: UNUSED_IMPORT
  enabled: true
  configuration:
    deleteUnusedImport: true
# Checks that braces are used in if, else, when, for, do, and while statements. Exception: single line ternary operator statement
- name: NO_BRACES_IN_CONDITIONALS_AND_LOOPS
  enabled: true
# Checks that the declaration part of a class-like code structures (class/interface/etc.) is in the proper order
- name: WRONG_ORDER_IN_CLASS_LIKE_STRUCTURES
  enabled: true
# Checks that properties with comments are separated by a blank line
- name: BLANK_LINE_BETWEEN_PROPERTIES
  enabled: true
# Checks top level order
- name: TOP_LEVEL_ORDER
  enabled: true
# Checks that non-empty code blocks with braces follow the K&R style (1TBS or OTBS style)
- name: BRACES_BLOCK_STRUCTURE_ERROR
  enabled: true
  configuration:
    openBraceNewline: 'True'
    closeBraceNewline: 'True'
# Checks that indentation is correct
- name: WRONG_INDENTATION
  enabled: true
  configuration:
    # Is newline at the end of a file needed
    newlineAtEnd: true
    # If true: in parameter list when parameters are split by newline they are indented with two indentations instead of one
    extendedIndentOfParameters: false
    # If true: if first parameter in parameter list is on the same line as opening parenthesis, then other parameters can be aligned with it
    alignedParameters: true
    # If true, expression bodies which begin on a separate line are indented
    # using a continuation indent. The default is false.
    #
    # This flag is called CONTINUATION_INDENT_FOR_EXPRESSION_BODIES in IDEA and
    # ij_kotlin_continuation_indent_for_expression_bodies in .editorconfig.
    extendedIndentForExpressionBodies: false
    # If true: if expression is split by newline after operator like +/-/`*`, then the next line is indented with two indentations instead of one
    extendedIndentAfterOperators: true
    # If true: when dot qualified expression starts on a new line, this line will be indented with two indentations instead of one
    extendedIndentBeforeDot: false
    # The indentation size for each file
    indentationSize: 4
# Checks that there is no empty blocks in a file.
# If allowEmptyBlocks is true, checks that it follows correct style (have a newline)
- name: EMPTY_BLOCK_STRUCTURE_ERROR
  enabled: true
  configuration:
    # Whether a newline after `{` is required in an empty block
    styleEmptyBlockWithNewline: 'True'
    allowEmptyBlocks: 'False'
# Checks that there is no more than one statement per line
- name: MORE_THAN_ONE_STATEMENT_PER_LINE
  enabled: true
# Checks that the line length is < lineLength parameter
- name: LONG_LINE
  enabled: true
  configuration:
    lineLength: '180'
# Checks that semicolons are not used at the end of a line
- name: REDUNDANT_SEMICOLON
  enabled: true
# Checks that line breaks follow code style guide: rule 3.6
- name: WRONG_NEWLINES
  enabled: true
  configuration:
    # If the number of parameters on one line is more than this threshold, all parameters will be placed on separate lines.
    maxParametersInOneLine: 2
    # 3 by default.
    maxCallsInOneLine: 3
# Checks trailing comma
- name: TRAILING_COMMA
  enabled: true
  configuration:
    # VALUE_ARGUMENT
    valueArgument: false
    # VALUE_PARAMETER
    valueParameter: false
    # REFERENCE_EXPRESSION
    indices: false
    # WHEN_CONDITION_WITH_EXPRESSION
    whenConditions: false
    # STRING_TEMPLATE
    collectionLiteral: false
    # TYPE_PROJECTION
    typeArgument: false
    # TYPE_PARAMETER
    typeParameter: false
    # DESTRUCTURING_DECLARATION_ENTRY
    destructuringDeclaration: false
# Inspection that checks if a long dot qualified expression is used in condition or as an argument
- name: COMPLEX_EXPRESSION
  enabled: true
# Checks that there are not too many consecutive spaces in line
- name: TOO_MANY_CONSECUTIVE_SPACES
  enabled: true
  configuration:
    # Maximum allowed number of consecutive spaces (not counting indentation)
    maxSpaces: '1'
    # Whether formatting for enums should be kept without checking
    saveInitialFormattingForEnums: false
# Checks that blank lines are used correctly.
# For example: triggers when there are too many blank lines between function declaration
- name: TOO_MANY_BLANK_LINES
  enabled: true
# Checks that usage of horizontal spaces doesn't violate code style guide
- name: WRONG_WHITESPACE
  enabled: true
# Checks that backticks (``) are not used in the identifier name, except the case when it is test method (marked with @Test annotation)
- name: BACKTICKS_PROHIBITED
  enabled: true
  # all code blocks annotated with  @Nested, @ParameterizedTest (JUnit 5) will
  # be ignored and not checked.
  ignoreAnnotated: [ Nested, ParameterizedTest, IndentationTest ]
# Checks that a single line concatenation of strings is not used
- name: STRING_CONCATENATION
  enabled: true
# Checks that each when statement have else in the end
- name: WHEN_WITHOUT_ELSE
  enabled: true
# Checks that annotation is on a single line
- name: ANNOTATION_NEW_LINE
  enabled: true
# Checks that method annotated with `Preview` annotation is private and has Preview suffix
- name: PREVIEW_ANNOTATION
  enabled: true
# Checks that enum structure is correct: enum entries should be separated by comma and line break and last entry should have semicolon in the end.
- name: ENUMS_SEPARATED
  enabled: true
# Checks that value on integer or float constant is not too big
- name: LONG_NUMERICAL_VALUES_SEPARATED
  enabled: true
  configuration:
    # Maximum number of digits which are not split
    maxNumberLength: '5'
    # Maximum number of digits between separators
    maxBlockLength: '3'
# Checks magic number
- name: MAGIC_NUMBER
  enabled: true
  configuration:
    # Ignore numbers from test
    ignoreTest: "true"
    # Ignore numbers
    ignoreNumbers: "-1, 1, 0, 2, 0U, 1U, 2U, -1L, 0L, 1L, 2L, 0UL, 1UL, 2UL"
    # Is ignore override hashCode function
    ignoreHashCodeFunction: "true"
    # Is ignore property
    ignorePropertyDeclaration: "false"
    # Is ignore local variable
    ignoreLocalVariableDeclaration: "false"
    # Is ignore value parameter
    ignoreValueParameter: "true"
    # Is ignore constant
    ignoreConstantDeclaration: "true"
    # Is ignore property in companion object
    ignoreCompanionObjectPropertyDeclaration: "true"
    # Is ignore numbers in enum
    ignoreEnums: "false"
    # Is ignore number in ranges
    ignoreRanges: "false"
    # Is ignore number in extension function
    ignoreExtensionFunctions: "false"
    # Is ignore number in pairs created using to
    ignorePairsCreatedUsingTo: "false"
# Checks that order of enum values or constant property inside companion is correct
- name: WRONG_DECLARATIONS_ORDER
  enabled: true
  configuration:
    # Whether enum members should be sorted alphabetically
    sortEnum: true
    # Whether class properties should be sorted alphabetically
    sortProperty: true
# Checks that multiple modifiers sequence is in the correct order
- name: WRONG_MULTIPLE_MODIFIERS_ORDER
  enabled: true
# Checks that identifier has appropriate name (See table of rule 1.2 part 6)
- name: CONFUSING_IDENTIFIER_NAMING
  enabled: true
# Checks year in the copyright
- name: WRONG_COPYRIGHT_YEAR
  enabled: true
# Inspection that checks if local variables are declared close to the first usage site
- name: LOCAL_VARIABLE_EARLY_DECLARATION
  enabled: true
# Try to avoid initialize val by null (e.g. val a: Int? = null -> val a: Int = 0)
- name: NULLABLE_PROPERTY_TYPE
  enabled: true
# Inspection that checks if there is a blank line before kDoc and none after
- name: WRONG_NEWLINES_AROUND_KDOC
  enabled: true
# Inspection that checks if there is no blank lines before first comment
- name: FIRST_COMMENT_NO_BLANK_LINE
  enabled: true
# Inspection that checks if there are blank lines between code and comment and between code start token and comment's text
- name: COMMENT_WHITE_SPACE
  enabled: true
  configuration:
    maxSpacesBeforeComment: 2
    maxSpacesInComment: 1
# Inspection that checks if all comment's are inside if-else code blocks. Exception is general if comment
- name: IF_ELSE_COMMENTS
  enabled: true
# Type aliases provide alternative names for existing types when type's reference text is longer 25 chars
- name: TYPE_ALIAS
  enabled: true
  configuration:
    typeReferenceLength: '25' # max length of type reference
# Checks if casting can be omitted
- name: SMART_CAST_NEEDED
  enabled: true
# Checks that variables of generic types have explicit type declaration
- name: GENERIC_VARIABLE_WRONG_DECLARATION
  enabled: true
# Inspection that checks if string template has redundant curly braces
- name: STRING_TEMPLATE_CURLY_BRACES
  enabled: true
# Variables with `val` modifier - are immutable (read-only). Usage of such variables instead of `var` variables increases
# robustness and readability of code, because `var` variables can be reassigned several times in the business logic.
# This rule prohibits usage of `var`s as local variables - the only exception is accumulators and counters
- name: SAY_NO_TO_VAR
  enabled: true
# Inspection that checks if string template has redundant quotes
- name: STRING_TEMPLATE_QUOTES
  enabled: true
# Check if there are redundant nested if-statements, which could be collapsed into a single one by concatenating their conditions
- name: COLLAPSE_IF_STATEMENTS
  enabled: true
  configuration:
    startCollapseFromNestedLevel: 2
# Checks that floating-point values are not used in arithmetic expressions
- name: FLOAT_IN_ACCURATE_CALCULATIONS
  enabled: true
# Checks that function length isn't too long
- name: TOO_LONG_FUNCTION
  enabled: true
  configuration:
    maxFunctionLength: 35 # max length of function
    isIncludeHeader: false # count function's header
# Warns if there are nested functions
- name: AVOID_NESTED_FUNCTIONS
  enabled: true
# Checks that lambda inside function parameters is in the end
- name: LAMBDA_IS_NOT_LAST_PARAMETER
  enabled: true
# Checks that function doesn't contains too many parameters
- name: TOO_MANY_PARAMETERS
  enabled: true
  configuration:
    maxParameterListSize: '5' # max parameters size
# Checks that function doesn't have too many nested blocks
- name: NESTED_BLOCK
  enabled: true
  configuration:
    maxNestedBlockQuantity: '4'
# Checks that function use default values, instead overloading
- name: WRONG_OVERLOADING_FUNCTION_ARGUMENTS
  enabled: true
# Checks that using runBlocking inside async block code
- name: RUN_BLOCKING_INSIDE_ASYNC
  enabled: true
# Checks that the long lambda has parameters
- name: TOO_MANY_LINES_IN_LAMBDA
  enabled: true
  configuration:
    maxLambdaLength: 10 # max length of lambda without parameters
# Checks that using unnecessary, custom label
- name: CUSTOM_LABEL
  enabled: true
# Checks that outer lambda has explicit parameter name
- name: PARAMETER_NAME_IN_OUTER_LAMBDA
  enabled: true
  configuration:
    strictMode: true # don't let outer lambdas have `it` as parameter
# Checks that property in constructor doesn't contain comment
- name: KDOC_NO_CONSTRUCTOR_PROPERTY
  enabled: true
  configuration:
    isParamTagsForParameters: false # create param tags for parameters without val or var
    isParamTagsForPrivateProperties: false # create param tags for private properties
    isParamTagsForGenericTypes: false # create param tags for generic types
# Checks that property in KDoc present in class
- name: KDOC_EXTRA_PROPERTY
  enabled: true
# There's a property in KDoc which is already present
- name: KDOC_DUPLICATE_PROPERTY
  enabled: true
# Checks that KDoc in constructor has property tag but with comment inside constructor
- name: KDOC_NO_CONSTRUCTOR_PROPERTY_WITH_COMMENT
  enabled: true
# if a class has single constructor, it should be converted to a primary constructor
- name: SINGLE_CONSTRUCTOR_SHOULD_BE_PRIMARY
  enabled: true
# Checks if class can be made as data class
- name: USE_DATA_CLASS
  enabled: true
# Checks that never use the name of a variable in the custom getter or setter
- name: WRONG_NAME_OF_VARIABLE_INSIDE_ACCESSOR
  enabled: true
# Checks that classes have only one init block
- name: MULTIPLE_INIT_BLOCKS
  enabled: true
# Checks that there are abstract functions in abstract class
- name: CLASS_SHOULD_NOT_BE_ABSTRACT
  enabled: true
# Checks if there are any trivial getters or setters
- name: TRIVIAL_ACCESSORS_ARE_NOT_RECOMMENDED
  enabled: true
# Checks that no custom getters and setters are used for properties. It is a more wide rule than TRIVIAL_ACCESSORS_ARE_NOT_RECOMMENDED
# Kotlin compiler automatically generates `get` and `set` methods for properties and also lets the possibility to override it.
# But in all cases it is very confusing when `get` and `set` are overridden for a developer who uses this particular class.
# Developer expects to get the value of the property, but receives some unknown value and some extra side effect hidden by the custom getter/setter.
# Use extra functions for it instead.
- name: CUSTOM_GETTERS_SETTERS
  enabled: true
# Checks if null-check was used explicitly (for example: if (a == null))
# Try to avoid explicit null checks (explicit comparison with `null`)
# Kotlin is declared as [Null-safe](https://kotlinlang.org/docs/reference/null-safety.html) language.
# But Kotlin architects wanted Kotlin to be fully compatible with Java, that's why `null` keyword was also introduced in Kotlin.
# There are several code-structures that can be used in Kotlin to avoid null-checks. For example: `?:`,  `.let {}`, `.also {}`, e.t.c
- name: AVOID_NULL_CHECKS
  enabled: true
# Checks if class instantiation can be wrapped in `apply` for better readability
- name: COMPACT_OBJECT_INITIALIZATION
  enabled: true
# Checks explicit supertype qualification
- name: USELESS_SUPERTYPE
  enabled: true
# Checks if extension function with the same signature don't have related classes
- name: EXTENSION_FUNCTION_SAME_SIGNATURE
  enabled: true
# Checks if there is empty primary constructor
- name: EMPTY_PRIMARY_CONSTRUCTOR
  enabled: true
# In case of not using field keyword in property accessors,
# there should be explicit backing property with the name of real property
# Example: val table get() {if (_table == null) ...} -> table should have _table
- name: NO_CORRESPONDING_PROPERTY
  enabled: true
# Checks if there is class/object that can be replace with extension function
- name: AVOID_USING_UTILITY_CLASS
  enabled: true
# If there is stateless class it is preferred to use object
- name: OBJECT_IS_PREFERRED
  enabled: true
# If there exists negated version of function you should prefer it instead of !functionCall
- name: INVERSE_FUNCTION_PREFERRED
  enabled: true
# Checks if class can be converted to inline class
- name: INLINE_CLASS_CAN_BE_USED
  enabled: true
# If file contains class, then it can't contain extension functions for the same class
- name: EXTENSION_FUNCTION_WITH_CLASS
  enabled: true
# Check if kts script contains other functions except run code
- name: RUN_IN_SCRIPT
  enabled: true
# Check if boolean expression can be simplified
- name: COMPLEX_BOOLEAN_EXPRESSION
  enabled: true
# Check if range can replace with until or `rangeTo` function with range
- name: CONVENTIONAL_RANGE
  enabled: true
  configuration:
    isRangeToIgnore: false
# Check if there is a call of print()\println() or console.log(). Assumption that it's a debug print
- name: DEBUG_PRINT
  enabled: true
# Check that typealias name is in PascalCase
- name: TYPEALIAS_NAME_INCORRECT_CASE
  enabled: true
# Should change property length - 1 to property lastIndex
- name: USE_LAST_INDEX
  enabled: true
# Only properties from the primary constructor should be documented in a @property tag in class KDoc
- name: KDOC_NO_CLASS_BODY_PROPERTIES_IN_HEADER
  enabled: true