class RuboCop::Cop::Metrics::Utils::AbcSizeCalculator
> ABC is .. a software size metric .. computed by counting the number > of assignments, branches and conditions for a section of code. > c2.com/cgi/wiki?AbcMetric
We separate the calculator from the cop so that the calculation, the formula itself, is easier to test.
Constants
- BRANCH_NODES
> Branch – an explicit forward program branch out of scope – a > function call, class method call .. > c2.com/cgi/wiki?AbcMetric
- CONDITION_NODES
> Condition – a logical/Boolean test, == != <= >= < > else case > default try catch ? and unary conditionals. > c2.com/cgi/wiki?AbcMetric
Public Class Methods
calculate(node)
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# File lib/rubocop/cop/metrics/utils/abc_size_calculator.rb, line 24 def self.calculate(node) new(node).calculate end
new(node)
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# File lib/rubocop/cop/metrics/utils/abc_size_calculator.rb, line 28 def initialize(node) @assignment = 0 @branch = 0 @condition = 0 @node = node end
Public Instance Methods
calculate()
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# File lib/rubocop/cop/metrics/utils/abc_size_calculator.rb, line 35 def calculate @node.each_node do |child| if child.assignment? @assignment += 1 elsif BRANCH_NODES.include?(child.type) evaluate_branch_nodes(child) elsif CONDITION_NODES.include?(child.type) @condition += 1 if node_has_else_branch?(child) @condition += 1 end end Math.sqrt(@assignment**2 + @branch**2 + @condition**2).round(2) end
evaluate_branch_nodes(node)
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# File lib/rubocop/cop/metrics/utils/abc_size_calculator.rb, line 50 def evaluate_branch_nodes(node) if node.comparison_method? @condition += 1 else @branch += 1 end end
node_has_else_branch?(node)
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# File lib/rubocop/cop/metrics/utils/abc_size_calculator.rb, line 58 def node_has_else_branch?(node) %i[case if].include?(node.type) && node.else? && node.loc.else.is?('else') end