Class: Rubocop::Cop::Cop

Inherits:
Object
  • Object
show all
Extended by:
AST::Sexp
Defined in:
lib/rubocop/cop/cop.rb

Overview

A scaffold for concrete cops.

The Cop class is meant to be extended.

Cops track offences and can autocorrect them of the fly.

A commissioner object is responsible for traversing the AST and invoking the specific callbacks on each cop. If a cop needs to do its own processing of the AST or depends on something else it should define the #investigate method and do the processing there.

Examples:


class CustomCop < Cop
  def investigate(processed_source)
    # Do custom processing
  end
end

Direct Known Subclasses

Lint::AssignmentInCondition, Lint::BlockAlignment, Lint::Debugger, Lint::EmptyEnsure, Lint::EndAlignment, Lint::EndInMethod, Lint::EnsureReturn, Lint::Eval, Lint::HandleExceptions, Lint::LiteralInCondition, Lint::Loop, Lint::ParenthesesAsGroupedExpression, Lint::RescueException, Lint::ShadowingOuterLocalVariable, Lint::Syntax, Lint::UnreachableCode, Lint::UselessAssignment, Lint::UselessComparison, Lint::UselessSetterCall, Lint::Void, Rails::HasAndBelongsToMany, Rails::Output, Rails::ReadAttribute, Rails::Validation, Style::AccessModifierIndentation, Style::Alias, Style::AlignArray, Style::AlignHash, Style::AlignParameters, Style::AndOr, Style::AsciiComments, Style::AsciiIdentifiers, Style::Attr, Style::BeginBlock, Style::BlockComments, Style::BlockNesting, Style::Blocks, Style::BracesAroundHashParameters, Style::CaseEquality, Style::CaseIndentation, Style::CharacterLiteral, Style::ClassAndModuleCamelCase, Style::ClassLength, Style::ClassMethods, Style::ClassVars, Style::CollectionMethods, Style::ColonMethodCall, Style::CommentAnnotation, Style::ConstantName, Style::CyclomaticComplexity, Style::DefWithParentheses, Style::DefWithoutParentheses, Style::Documentation, Style::DotPosition, Style::EmptyLineBetweenDefs, Style::EmptyLines, Style::EmptyLinesAroundAccessModifier, Style::EmptyLinesAroundBody, Style::EmptyLiteral, Style::Encoding, Style::EndBlock, Style::EndOfLine, Style::EvenOdd, Style::FavorJoin, Style::FavorSprintf, Style::FavorUnlessOverNegatedIf, Style::FavorUntilOverNegatedWhile, Style::FinalNewline, Style::For, Style::GlobalVars, Style::HashMethods, Style::HashSyntax, Style::IfUnlessModifier, Style::IfWithSemicolon, Style::IndentationWidth, Style::Lambda, Style::LambdaCall, Style::LeadingCommentSpace, Style::LineLength, Style::MethodCallParentheses, Style::MethodCalledOnDoEndBlock, Style::MethodLength, Style::MethodName, Style::ModuleFunction, Style::MultilineBlockChain, Style::MultilineIfThen, Style::MultilineTernaryOperator, Style::NestedTernaryOperator, Style::NilComparison, Style::Not, Style::NumericLiterals, Style::OneLineConditional, Style::OpMethod, Style::ParameterLists, Style::ParenthesesAroundCondition, Style::PerlBackrefs, Style::Proc, Style::RaiseArgs, Style::ReduceArguments, Style::RedundantBegin, Style::RedundantException, Style::RedundantReturn, Style::RedundantSelf, Style::RegexpLiteral, Style::RescueModifier, Style::Semicolon, Style::SignalException, Style::SingleLineMethods, Style::SpaceAfterColon, Style::SpaceAfterComma, Style::SpaceAfterControlKeyword, Style::SpaceAfterMethodName, Style::SpaceAfterNot, Style::SpaceAfterSemicolon, Style::SpaceAroundBlockBraces, Style::SpaceAroundEqualsInParameterDefault, Style::SpaceAroundOperators, Style::SpaceBeforeModifierKeyword, Style::SpaceInsideBrackets, Style::SpaceInsideHashLiteralBraces, Style::SpaceInsideParens, Style::SpecialGlobalVars, Style::StringLiterals, Style::SymbolArray, Style::SymbolName, Style::Tab, Style::TrailingBlankLines, Style::TrailingWhitespace, Style::TrivialAccessors, Style::UnlessElse, Style::VariableInterpolation, Style::VariableName, Style::WhenThen, Style::WhileUntilDo, Style::WhileUntilModifier, Style::WordArray

Constant Summary collapse

OPERATOR_METHODS =

http://phrogz.net/programmingruby/language.html#table_18.4 Backtick is added last just to help editors parse this code.

%w(
  | ^ & <=> == === =~ > >= < <= << >>
  + - * / % ** ~ +@ -@ [] []= ! != !~
).map(&:to_sym) + [:'`']

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = nil, options = nil) ⇒ Cop

Returns a new instance of Cop.



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# File 'lib/rubocop/cop/cop.rb', line 92

def initialize(config = nil, options = nil)
  @config = config || Config.new
  @options = options || { auto_correct: false, debug: false }

  @offences = []
  @corrections = []
  @ignored_nodes = []
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/rubocop/cop/cop.rb', line 55

def config
  @config
end

#corrections ⇒ Object (readonly)

Returns the value of attribute corrections.



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# File 'lib/rubocop/cop/cop.rb', line 55

def corrections
  @corrections
end

#offences ⇒ Object (readonly)

Returns the value of attribute offences.



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# File 'lib/rubocop/cop/cop.rb', line 55

def offences
  @offences
end

#processed_source ⇒ Object

TODO: Bad design.



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# File 'lib/rubocop/cop/cop.rb', line 56

def processed_source
  @processed_source
end

Class Method Details

.all ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 60

def self.all
  @all.clone
end

.cop_name ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 72

def self.cop_name
  name.to_s.split('::').last
end

.cop_type ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 76

def self.cop_type
  name.to_s.split('::')[-2].downcase.to_sym
end

.inherited(subclass) ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 68

def self.inherited(subclass)
  @all << subclass
end

.lint? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/cop.rb', line 84

def self.lint?
  cop_type == :lint
end

.non_rails ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 64

def self.non_rails
  @all.without_type(:rails)
end

.rails? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/cop.rb', line 88

def self.rails?
  cop_type == :rails
end

.style? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/cop.rb', line 80

def self.style?
  cop_type == :style
end

Instance Method Details

#add_offence(severity, node, loc, message = nil) ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 121

def add_offence(severity, node, loc, message = nil)
  location = loc.is_a?(Symbol) ? node.loc.send(loc) : loc

  return if disabled_line?(location.line)

  message = message ? message : message(node)
  message = debug? ? "#{name}: #{message}" : message

  corrected = begin
                autocorrect(node) if autocorrect?
                autocorrect?
              rescue CorrectionNotPossible
                false
              end
  @offences << Offence.new(severity, location, message, name, corrected)
end

#autocorrect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/cop.rb', line 105

def autocorrect?
  @options[:auto_correct] && support_autocorrect?
end

#convention(node, location, message = nil) ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 138

def convention(node, location, message = nil)
  add_offence(:convention, node, location, message)
end

#cop_config ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 101

def cop_config
  @config.for_cop(self)
end

#cop_name ⇒ Object Also known as: name 



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# File 'lib/rubocop/cop/cop.rb', line 146

def cop_name
  self.class.cop_name
end

#debug? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/cop.rb', line 109

def debug?
  @options[:debug]
end

#ignore_node(node) ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 152

def ignore_node(node)
  @ignored_nodes << node
end

#message(node = nil) ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 113

def message(node = nil)
  self.class::MSG
end

#support_autocorrect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/cop.rb', line 117

def support_autocorrect?
  respond_to?(:autocorrect, true)
end

#warning(node, location, message = nil) ⇒ Object 



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# File 'lib/rubocop/cop/cop.rb', line 142

def warning(node, location, message = nil)
  add_offence(:warning, node, location, message)
end