Class: Evilution::Equivalent::Heuristic::ArithmeticIdentity Private

Inherits:
Object
  • Object
show all
Defined in:
lib/evilution/equivalent/heuristic/arithmetic_identity.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Constant Summary collapse

ADDITIVE_IDENTITY =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Patterns where the original expression is an arithmetic identity operation. "x + 0" is identity (equals x), so mutating the 0 to something else means the original was a no-op — if the test doesn't catch it, it's likely equivalent.

/[\w)\].]+\s*[+-]\s*0\b|\b0\s*\+\s*[\w(\[]/
MULTIPLICATIVE_IDENTITY =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

%r{[\w)\].]+\s*[*/]\s*1\b|\b1\s*\*\s*[\w(\[]}
EXPONENT_IDENTITY =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

/[\w)\].]+\s*\*\*\s*1\b/

Instance Method Summary collapse

Instance Method Details

#match?(mutation) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/evilution/equivalent/heuristic/arithmetic_identity.rb', line 13

def match?(mutation)
  return false unless mutation.operator_name == "integer_literal"

  removed = diff_line(mutation.diff, "- ")
  return false unless removed

  content = removed.sub(/^- /, "")
  content.match?(ADDITIVE_IDENTITY) ||
    content.match?(MULTIPLICATIVE_IDENTITY) ||
    content.match?(EXPONENT_IDENTITY)
end