Class: Must::Differ

Inherits:
Object
  • Object
show all
Defined in:
lib/must/differ.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(a, b, path = nil) ⇒ Differ

Returns a new instance of Differ.



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# File 'lib/must/differ.rb', line 5

def initialize(a, b, path = nil)
  path ||= a.class.name.downcase
  @a, @b, @path = a, b, path
end

Instance Attribute Details

#a ⇒ Object (readonly)

Returns the value of attribute a.



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# File 'lib/must/differ.rb', line 3

def a
  @a
end

#b ⇒ Object (readonly)

Returns the value of attribute b.



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# File 'lib/must/differ.rb', line 3

def b
  @b
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/must/differ.rb', line 3

def path
  @path
end

Instance Method Details

#eq_float?(a, b) ⇒ Boolean

Returns:



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# File 'lib/must/differ.rb', line 10

def eq_float?(a, b)
  (a - b).abs <= 0.0000001
end

#eq_object?(a, b) ⇒ Boolean

Returns:



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# File 'lib/must/differ.rb', line 14

def eq_object?(a, b)
  a == b
end

#execute ⇒ Object 



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# File 'lib/must/differ.rb', line 71

def execute
  execute!
  return true
rescue Must::Invalid
  return false
end

#execute! ⇒ Object 



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# File 'lib/must/differ.rb', line 18

def execute!
  unless a.class == b.class
    if a == nil or b == nil
      failed ValueMismatch, "%s expected %s, but got %s" % [path, a.class, b.class]
    else
      failed ClassMismatch, "%s expected %s, but got %s" % [path, a.class, b.class]
    end
  end

  if a.is_a?(Array)
    max = [a.size, b.size].max
    max.times do |i|
      Differ.new(a[i], b[i], "#{path}[#{i}]").execute!
    end
    return true
  end

  if a.is_a?(Hash)
    (a.keys | b.keys).each do |key|
      Differ.new(a[key], b[key], "#{path}[#{key.inspect}]").execute!
    end
    return true
  end

  eq = 
    case a
    when Float; eq_float?(a, b)
    else      ; eq_object?(a, b)
    end

  unless eq
    av = a.inspect.split(//)[0..50].join
    bv = b.inspect.split(//)[0..50].join
    if a.class == b.class
      failed ValueMismatch, "%s expected %s, but got %s" % [path, av, bv]
    else
      failed ValueMismatch, "%s expected %s(%s), but got %s(%s)" % [path, av, a.class, bv, a.class]
    end
  end

  return true

rescue Must::ClassMismatch => err
  if a.class == b.class
#        as = Must::StructInfo.new(a).inspect
#        bs = Must::StructInfo.new(b).inspect
#        raise Must::StructMismatch, "%s expected %s, but got %s" % [path, as, bs]
    raise Must::StructMismatch, err.to_s
  else
    raise
  end
end

#failed(klass, msg) ⇒ Object

Raises:

  • (klass) 


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# File 'lib/must/differ.rb', line 85

def failed(klass, msg)
  raise klass, msg
end

#message ⇒ Object 



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# File 'lib/must/differ.rb', line 78

def message
  execute!
  return nil
rescue Must::Invalid => err
  return err.message
end