class Crispr::Mutations::Literal

Mutates basic Ruby literals to edge-case or alternate values.

def mutations_for(node)

Returns:
  • (Array) - mutated nodes

Parameters:
  • node (Parser::AST::Node) -- the AST node to inspect 
def mutations_for(node)
  return [] unless node.is_a?(Parser::AST::Node)
  case node.type
  when :int
    [replace_literal(node, 0), replace_literal(node, -1), replace_literal(node, 1)].uniq
  when :str
    [replace_literal(node, ""), replace_literal(node, "crispr")]
  when :sym
    [replace_literal(node, :other)]
  when :array
    [Parser::AST::Node.new(:array, [])]
  when :hash
    [Parser::AST::Node.new(:hash, [])]
  when :true
    [replace_literal(node, false)]
  when :false
    [replace_literal(node, true)]
  when :nil
    [Parser::AST::Node.new(:str, ["null"])]
  else
    []
  end
end

def replace_literal(original, new_value) 

def replace_literal(original, new_value)
  Parser::AST::Node.new(original.type, [new_value])
end