Module: Evilution::Compare::Fingerprint

Defined in:
lib/evilution/compare/fingerprint.rb

Class Method Summary collapse

Class Method Details

.compute(file_path:, line:, body:) ⇒ Object

rubocop:enable Metrics/PerceivedComplexity, Style/MultipleComparison



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# File 'lib/evilution/compare/fingerprint.rb', line 77

def compute(file_path:, line:, body:)
  minus = body[:minus].map { |l| normalize_line(l) }
  plus  = body[:plus].map  { |l| normalize_line(l) }
  payload = [file_path, line.to_s, minus.join("\n"), plus.join("\n")].join("\x00")
  Digest::SHA256.hexdigest(payload)
end

.extract_from_evilution_diff(diff) ⇒ Object 



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# File 'lib/evilution/compare/fingerprint.rb', line 9

def extract_from_evilution_diff(diff)
  minus = []
  plus = []
  diff.to_s.each_line do |line|
    line = line.chomp
    if line.start_with?("- ")
      minus << line[2..]
    elsif line.start_with?("+ ")
      plus << line[2..]
    end
  end
  { minus: minus, plus: plus }
end

.extract_from_mutant_diff(diff) ⇒ Object 



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# File 'lib/evilution/compare/fingerprint.rb', line 23

def extract_from_mutant_diff(diff)
  minus = []
  plus = []
  diff.to_s.each_line do |line|
    line = line.chomp
    next if line.start_with?("---", "+++", "@@")

    if line.start_with?("-")
      minus << line[1..]
    elsif line.start_with?("+")
      plus << line[1..]
    end
  end
  { minus: minus, plus: plus }
end

.normalize_line(line) ⇒ Object

v1 limitation: only “ and ‘ literals are preserved. Regex literals (/…/), heredocs, %w[], %q{} forms are treated as ordinary code — whitespace runs inside them collapse. A mutation touching whitespace inside a regex may false-match across tools. rubocop:disable Metrics/PerceivedComplexity, Style/MultipleComparison



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# File 'lib/evilution/compare/fingerprint.rb', line 44

def normalize_line(line)
  out = +""
  i = 0
  in_literal = nil
  last_was_space = false
  chars = line.chars
  while i < chars.length
    ch = chars[i]
    if in_literal
      out << ch
      if ch == "\\" && i + 1 < chars.length
        out << chars[i + 1]
        i += 2
        next
      end
      in_literal = nil if ch == in_literal
    elsif ch == '"' || ch == "'"
      in_literal = ch
      out << ch
      last_was_space = false
    elsif ch == " " || ch == "\t"
      out << " " unless last_was_space || out.empty?
      last_was_space = true
    else
      out << ch
      last_was_space = false
    end
    i += 1
  end
  out.rstrip
end