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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Metrics
module Utils
# > ABC is .. a software size metric .. computed by counting the number
# > of assignments, branches and conditions for a section of code.
# > http://c2.com/cgi/wiki?AbcMetric
#
# We separate the *calculator* from the *cop* so that the calculation,
# the formula itself, is easier to test.
module AbcSizeCalculator
# > Branch -- an explicit forward program branch out of scope -- a
# > function call, class method call ..
# > http://c2.com/cgi/wiki?AbcMetric
BRANCH_NODES = %i[send csend].freeze
# > Condition -- a logical/Boolean test, == != <= >= < > else case
# > default try catch ? and unary conditionals.
# > http://c2.com/cgi/wiki?AbcMetric
CONDITION_NODES = CyclomaticComplexity::COUNTED_NODES.freeze
def self.calculate(node)
assignment = 0
branch = 0
condition = 0
node.each_node do |child|
if child.assignment?
assignment += 1
elsif BRANCH_NODES.include?(child.type)
branch += 1
elsif CONDITION_NODES.include?(child.type)
condition += 1
end
end
Math.sqrt(assignment**2 + branch**2 + condition**2).round(2)
end
end
end
end
end
end
Version data entries
12 entries across 10 versions & 2 rubygems