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#!/usr/bin/env ruby
# frozen_string_literal: true
require "rubocop"
# Shows ABC size of methods and blocks for passed files.
#
# See https://docs.rubocop.org/rubocop/cops_metrics.html#metricsabcsize
#
# Usage: scripts/ruby-metrics-abc.rb <ruby file> ...
# Example: scripts/ruby-metrics-abc.rb app/models/project.rb app/models/user.rb
module Tooling
class MetricsABC
extend RuboCop::AST::NodePattern::Macros
include RuboCop::AST::Traversal
def run(source)
version = RUBY_VERSION[/^(\d+\.\d+)/, 1].to_f
ast = RuboCop::AST::ProcessedSource.new(source, version).ast
walk(ast)
end
def on_def(node)
print_abc("def #{node.method_name}", node)
end
def on_defs(node)
print_abc("def self.#{node.method_name}", node)
end
def on_block(node)
return unless node.parent&.send_type?
method_name = node.parent.method_name
arguments = node.parent.arguments.select { |n| n.sym_type? || n.str_type? }.map(&:source)
print_abc("#{method_name}(#{arguments.join(', ')})", node)
end
private
def print_abc(prefix, node)
# https://www.rubydoc.info/gems/rubocop/RuboCop/Cop/Metrics/Utils/AbcSizeCalculator#calculate-instance_method
abc_score, abc_vector = RuboCop::Cop::Metrics::Utils::AbcSizeCalculator
.calculate(node, discount_repeated_attributes: true) # rubocop:disable CodeReuse/ActiveRecord -- This is not AR
puts format(" %d: %s: %.2f %s", node.first_line, prefix, abc_score, abc_vector)
end
end
if ARGV.empty?
puts "Usage: scripts/ruby-metrics-abc.rb <ruby file> ..."
puts " Example: scripts/ruby-metrics-abc.rb app/models/project.rb app/models/user.rb"
end
ARGV.each do |file|
puts "Checking #{file}:"
MetricsABC.new.run(File.read(file))
end
end
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