Module: Bang::MethodMissing

Included in:
Object
Defined in:
lib/bang.rb

Overview

Mixin of Object class, will take any undefined bang method, e.g. ‘foo!` and if there is a corresponding query method, e.g. `foo?`, then it will utilize the query method to make an assertion.

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(s, *a, &b) ⇒ Object

If missing method is a bang method, see if there is a corresponding query method and use that to make an assertion. Will also recognize the same prefixed by ‘not_`, e.g. `not_equal_to?`.



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# File 'lib/bang.rb', line 73

def method_missing(s, *a, &b)
  return super(s, *a, &b) unless s.to_s.end_with?('!')

  neg  = false
  name = s.to_s.chomp('!')

  if name.start_with?('not_')
    neg  = true
    name = name[4..-1]
  end

  meth = method("#{name}?") rescue nil

  return super(s, *a, &b) unless meth

  result = meth.call(*a, &b)

  if neg
    refute(result, Bang::Assertion.piece(s, a, b, caller))
  else
    assert(result, Bang::Assertion.piece(s, a, b, caller))
  end
end