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Contents
require 'roodi/checks/check'
module Roodi
module Checks
# The ABC metric method check calculates the number of Assignments,
# Branches and Conditionals in your code. It is similar to
# cyclomatic complexity, so the lower the better.
class AbcMetricMethodCheck < Check
ASSIGNMENTS = [:lasgn]
BRANCHES = [:vcall, :call]
CONDITIONS = [:==, :"!=", :<=, :>=, :<, :>]
OPERATORS = [:*, :/, :%, :+, :<<, :>>, :&, :|, :^]
DEFAULT_SCORE = 10
attr_accessor :score
def initialize
super()
self.score = DEFAULT_SCORE
end
def interesting_nodes
[:defn]
end
def evaluate_start(node)
method_name = node[1]
a = count_assignments(node)
b = count_branches(node)
c = count_conditionals(node)
score = Math.sqrt(a*a + b*b + c*c)
add_error "Method name \"#{method_name}\" has an ABC metric score of <#{a},#{b},#{c}> = #{score}. It should be #{@score} or less." unless score <= @score
end
private
def count_assignments(node)
count = assignment?(node) ? 1 : 0
node.children.each {|child_node| count += count_assignments(child_node)}
count
end
def count_branches(node)
count = branch?(node) ? 1 : 0
node.children.each {|child_node| count += count_branches(child_node)}
count
end
def count_conditionals(node)
count = conditional?(node) ? 1 : 0
node.children.each {|child_node| count += count_conditionals(child_node)}
count
end
def assignment?(node)
ASSIGNMENTS.include?(node.node_type)
end
def branch?(node)
BRANCHES.include?(node.node_type) && !conditional?(node) && !operator?(node)
end
def conditional?(node)
(:call == node.node_type) && CONDITIONS.include?(node[2])
end
def operator?(node)
(:call == node.node_type) && OPERATORS.include?(node[2])
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems