Class: RuboCop::Cop::SketchupRequirements::SketchupExtension

Inherits:
SketchUp::Cop
  • Object
show all
Includes:
RangeHelp, SketchUp::ExtensionProject, SketchUp::NoCommentDisable
Defined in:
lib/rubocop/sketchup/cop/requirements/sketchup_extension.rb

Overview

Register a single instance of SketchupExtension per extension. This should be done by the root .rb file in the extension package.

Constant Summary collapse

MSG = 
'Create and register one SketchupExtension instance per extension.'.freeze
MSG_CREATE_ONE = 
'Create only SketchupExtension instance per extension.'.freeze
MSG_CREATE_MISSING = 
'SketchupExtension.new not found.'.freeze
MSG_REGISTER_ONE = 
'Only register one SketchupExtension instance per extension.'.freeze
MSG_REGISTER_MISSING = 
'Registration of SketchupExtension not found. Expected %s'.freeze

Constants included from SketchUp::Config

SketchUp::Config::DEFAULT_CONFIGURATION

Instance Method Summary collapse

Methods included from SketchUp::ExtensionProject

#config_path, #path_relative_to_source, #relative_source_path, #root_file?, #source_path

Methods inherited from SketchUp::Cop

inherited, #relevant_file?

Instance Method Details

#investigate(processed_source) ⇒ Object 



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# File 'lib/rubocop/sketchup/cop/requirements/sketchup_extension.rb', line 33

def investigate(processed_source)
  return unless root_file?(processed_source)

  source_node = processed_source.ast
  # Using range similar to RuboCop::Cop::Naming::Filename (file_name.rb)
  range = source_range(processed_source.buffer, 1, 0)

  # Look for SketchupExtension.new.
  extension_nodes = sketchup_extension_new(source_node).to_a

  # Threat instances not assigned to anything as non-existing.
  extension_nodes.select! { |node|
    node.parent && node.parent.assignment?
  }

  # There should not be multiple instances.
  if extension_nodes.size > 1
    add_offense(nil,
        location: range,
        message: MSG_CREATE_ONE,
        severity: :error)
    return
  end

  # There should be exactly one.
  extension_node = extension_nodes.first
  if extension_node.nil?
    add_offense(nil,
        location: range,
        message: MSG_CREATE_MISSING,
        severity: :error)
    return
  end

  # Find the name of the value SketchupExtension.new was assigned to.
  assignment_node = extension_node.parent
  if assignment_node.casgn_type?
    extension_var = assignment_node.to_a[1]
  else
    extension_var = assignment_node.to_a[0]
  end

  # Look for Sketchup.register and make sure it register the extension
  # object detected earlier.
  registered_vars = sketchup_register_extension(source_node).to_a

  # Make sure there is only one call to `register_extension`.
  if registered_vars.size > 1
    add_offense(registered_vars[1],
        message: MSG_REGISTER_ONE,
        severity: :error)
    return
  end

  registered_var = sketchup_register_extension(source_node).first
  unless registered_var == extension_var
    msg = MSG_REGISTER_MISSING % extension_var.to_s
    add_offense(nil,
        location: range,
        message: msg,
        severity: :error)
  end
end