Class: Bitty::BitProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/bitty/bit_proxy.rb

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ BitProxy

this will be redefined in self.column=



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# File 'lib/bitty/bit_proxy.rb', line 15

def initialize(*args)
end

Class Attribute Details

.column ⇒ Object

Returns the value of attribute column.



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# File 'lib/bitty/bit_proxy.rb', line 54

def column
  @column
end

Class Method Details

.bit_names=(names) ⇒ Object 



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# File 'lib/bitty/bit_proxy.rb', line 23

def bit_names=(names)
  @power2 = {}
  p = 1

  names.each do |name|
    n = name.to_sym

    if @power2.include?(n)
      raise ArgumentError, "Bit name #{n} repeated more that once!"
    else
      @power2[n] = p
      p <<= 1
    end
  end

  @power2.each do |name, bitmask|
    inv = ~bitmask
    class_eval <<-RUBY
      def #{name}
        (value & #{bitmask}) != 0
      end

      alias #{name}? #{name}

      def #{name}=(val)
        self.value = Bitty.true?(val) ? (value | #{bitmask}) : (value & #{inv})
      end
    RUBY
  end
end

.named_scope(*args) ⇒ Object 



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# File 'lib/bitty/bit_proxy.rb', line 78

def named_scope(*args)
  bits = args.extract_options!
  args.each { |arg| bits[arg] = true }

  masks = [0, 0]

  bits.each do |name, val|
    mask = power2(name)
    raise ArgumentError, "invalid bit name #{name}" unless mask

    masks[Bitty.true?(val) ? 1 : 0] |= mask
  end

  cond = [nil, nil]

  if masks[0] != 0
    cond[0] = "#{column} & #{masks[0]} = 0"
  end

  if masks[1] != 0
    cond[1] = "#{column} & #{masks[1]} = #{masks[1]}"
  end

  { :conditions => cond.compact.map { |c| "(#{c})" } * ' AND ' }
end

.power2(name) ⇒ Object 



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# File 'lib/bitty/bit_proxy.rb', line 19

def power2(name)
  @power2[name.to_sym]
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/bitty/bit_proxy.rb', line 105

def [](key)
  bitmask = power2(key)

  if bitmask
    (value & bitmask) != 0
  else
    nil
  end
end

#[]=(key, val) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/bitty/bit_proxy.rb', line 115

def []=(key, val)
  bitmask = power2(key)
  raise ArgumentError, "unknown bitname: #{key}" unless bitmask

  self.value = Bitty.true?(val) ? (value | bitmask) : (value & ~bitmask)
end

#set!(value) ⇒ Object 



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# File 'lib/bitty/bit_proxy.rb', line 122

def set!(value)
  case value
  when Array
    value.each { |key| self[key] = true }
  when Hash
    value.each { |key, val| self[key] = val }
  when Fixnum
    self.value = value
  else
    raise ArgumentError, "invalid value (must be Array/Hash/Fixnum)"
  end
end