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Module: RuboCop::Cop::ProjectIndexHelp

Overview

Common helpers for cops that consult the project-wide static-analysis index via Base#project_index.

Mixed-in cops gain the #external_dependency_checksum override that invalidates the ::RuboCop::ResultCache whenever the indexed project files change on disk. To run index-backed analysis, cops should simply check whether project_index is non-nil; the runner only exposes a non-nil index when the user opted in via AllCops/UseProjectIndex and the underlying gem is available.

Constant Summary

Class Attribute Summary

  • .cached_index_signature rw

    The signature is a property of the index, not of the cop, and computing it stats every indexed file, so all cops sharing an index share one computation.

Instance Method Summary

Class Attribute Details

.cached_index_signature (rw)

The signature is a property of the index, not of the cop, and computing it stats every indexed file, so all cops sharing an index share one computation. A single-entry cache (instead of a hash keyed by index) avoids retaining stale graphs in long-lived processes.

[ GitHub ] 

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 25



attr_accessor :cached_index_signature


  







Instance Method Details



  

    #compute_project_index_signature   (private)
  

  [ GitHub ]


  

  


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



def compute_project_index_signature
  project_index.documents.filter_map do |doc|
    uri = doc.uri
    next if uri == BUILTIN_DOCUMENT_URI

    path = uri.delete_prefix(FILE_URI_PREFIX).sub(WINDOWS_DRIVE_PREFIX, '')
    mtime, size = begin
      stat = File.stat(path)
      [stat.mtime.to_f, stat.size]
    rescue StandardError
      [0, 0]
    end

    "#{path}:#{mtime}:#{size}"
  end.sort
end


  








  

    #definitions_in_other_files(definitions)   (private)
  



  

    


Returns the definitions among definitions that live in a file other than the
one being inspected, ordered by path and line. Definitions without a file://
URI (e.g. Rubydex’s built-in declarations) are ignored.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 41



def definitions_in_other_files(definitions)
  current = processed_source.file_path

  definitions
    .select { |definition| definition.location.uri.start_with?(FILE_URI_PREFIX) }
    .reject { |definition| File.identical?(definition.location.to_file_path, current) }
    .sort_by do |definition|
    [definition.location.to_file_path,
     definition.location.start_line]
  end
end


  








  

    #external_dependency_checksum  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 28



def external_dependency_checksum
  return nil unless project_index

  @external_dependency_checksum ||= Digest::SHA1.hexdigest(
    project_index_signature.join("\n")
  )
end


  








  

    #indexed_singleton_member(namespace, member_name)   (private)
  



  

    


A namespace without any singleton method has no singleton-class
declaration of its own, so the lookup starts from the first ancestor
that has one; its find_member covers the rest of the chain.



  



  [ GitHub ]


  

  


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



def indexed_singleton_member(namespace, member_name)
  namespace.ancestors.each do |ancestor|
    singleton = indexed_singleton_of(ancestor)
    return singleton.find_member(member_name) if singleton
  end

  nil
end


  








  

    #indexed_singleton_of(declaration)   (private)
  



  

    


The declaration of `declaration’s singleton class, or nil when no
singleton method is defined on it anywhere in the project.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 98



def indexed_singleton_of(declaration)
  project_index["#{declaration.name}::<#{declaration.name.split('::').last}>"]
end


  








  

    #inherited_index_member?(scope, member_name)  ⇒ Boolean  (private)
  



  

    


Whether an ancestor of scope other than scope itself defines
member_name.



  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 116



def inherited_index_member?(scope, member_name)
  scope.ancestors.any? do |ancestor|
    ancestor.name != scope.name && ancestor.member(member_name)
  end
end


  








  

    #lexical_nesting_of(node)   (private)
  



  

    


The lexical nesting the node’s constants resolve through, outermost
first. Only scopes whose body contains the node count: a class or
module’s identifier and superclass expression are evaluated before its
scope exists, so ancestors reached through them are excluded.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 82



def lexical_nesting_of(node)
  nesting = []
  child = node

  node.each_ancestor do |ancestor|
    if ancestor.type?(:class, :module) && child.equal?(ancestor.body)
      nesting << ancestor.identifier.const_name
    end
    child = ancestor
  end

  nesting.reverse
end


  








  

    #prior_definition_in_other_file(definitions)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 53



def prior_definition_in_other_file(definitions)
  definitions_in_other_files(definitions).first
end


  








  

    #project_index_signature   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 129



def project_index_signature
  index, signature = ProjectIndexHelp.cached_index_signature
  return signature if index.equal?(project_index)

  compute_project_index_signature.tap do |computed|
    ProjectIndexHelp.cached_index_signature = [project_index, computed]
  end
end


  








  

    #resolve_constant_in_index(const_node)   (private)
  



  

    


Resolves a constant node the way Ruby does: the first segment through
the lexical nesting and every following segment inside the previous
one. (Qualified names cannot be passed to resolve_constant as a
whole, since it only applies the nesting to the full name. Later
segments use find_member — the namespace and its ancestors — since
resolve_constant cannot take an already-resolved namespace as the
scope, only names as they appear in source.)



  



  [ GitHub ]


  

  


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



def resolve_constant_in_index(const_node)
  segments = const_node.const_name.split('::')
  nesting = const_node.absolute? ? [] : lexical_nesting_of(const_node)

  declaration = project_index.resolve_constant(segments.first, nesting)
  segments.drop(1).each do |segment|
    return nil unless declaration.is_a?(Rubydex::Namespace)

    declaration = declaration.find_member(segment)
  end

  declaration
end


  








  

    #same_file?(path, other)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/mixin/project_index_help.rb', line 122



def same_file?(path, other)
  return true if File.identical?(path, other)

  normalized = [path, other].map { |p| File.expand_path(p).tr('\\', '/') }
  normalized.uniq.one? || (Platform.windows? && normalized[0].casecmp?(normalized[1]))
end