class Rcov::FileStatistics

def code_coverage

total amount of lines of code (loc). Returns a float from 0 to 1.0.
Code coverage rate: fraction of lines of code executed, relative to the 
def code_coverage
  indices = (0...@lines.size).select{|i| is_code? i }
  return 0 if indices.size == 0
  count = 0
  indices.each {|i| count += 1 if @coverage[i] }
  1.0 * count / indices.size
end