Class: CodeKeeper::Metrics::ClassLength

Inherits:
Object
  • Object
show all
Defined in:
lib/code_keeper/metrics/class_length.rb

Overview

Caluculate Class Length.

Instance Method Summary collapse

Constructor Details

#initialize(file_path) ⇒ ClassLength

Returns a new instance of ClassLength.



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# File 'lib/code_keeper/metrics/class_length.rb', line 7

def initialize(file_path)
  @ps = Parser.parse(file_path)
  @body = @ps.ast
  @score_hash = {}
end

Instance Method Details

#score ⇒ Object

NOTE: This doesn’t exclude foldale sources like Array, Hash and Heredoc.



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# File 'lib/code_keeper/metrics/class_length.rb', line 14

def score
  @body.each_node(:class, :casgn, :module) do |node|
    if node.class_type? || node.module_type?
      @score_hash.store(build_namespace(node), calculate(node))
    elsif node.casgn_type?
      parent = node.parent

      if parent&.assignment?
        block_node = node.children[2]
        klass = node.loc.name.source
      elsif parent&.parent&.masgn_type?
        # In the case where `A, B = Struct.new(:a, :b)`,
        # B is always nil.
        assigned = parent.loc.expression.source.split(',').first
        next unless node.loc.name.source == assigned

        block_node = parent.parent.children[1]
        klass = node.loc.name.source
      else
        _scope, klass, block_node = *node
        klass = klass.to_s
      end

      # This is not to raise error on dynamic assignments like `X = Y = Z = Class.new`.
      # the block node is as follows if node is X:
      # `s(:casgn, nil, :Y, s(:casgn, nil, :Z, s(:block, ...`
      # Similarly the block node is `:X` as follows if node is Y.
      next unless block_node.respond_to?(:class_definition?) && block_node.class_definition?

      # NOTE: klass doesn't have a namespace.
      # Only supports namepaces in `class A; end` case.
      if klass
        @score_hash.store(klass, calculate(block_node)) if klass
      else
        @score_hash.store(build_namespace(block_node), calculate(block_node))
      end
    end
  end
  @score_hash
end