Class: Handle::Permissions

Inherits:
Object
  • Object
show all
Defined in:
lib/handle/permissions.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*flags) ⇒ Permissions

Returns a new instance of Permissions.



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# File 'lib/handle/permissions.rb', line 5

def initialize(*flags)
  if flags.last.is_a?(Fixnum)
    @bitmask = flags.pop
  else
    @bitmask = 0
  end
  @flags = Hash[flags.reverse.collect.with_index { |f,i| [f,2**i] }.reverse]
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args) ⇒ Object 



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# File 'lib/handle/permissions.rb', line 18

def method_missing(sym, *args)
  flag = sym.to_s.sub(/([\?\=])$/,'').to_sym
  if @flags.include?(flag)
    case $1
    when '?' then read(flag)
    when '=' then write(flag,args.first)
    else super(sym, *args)
    end
  else
    super(sym, *args)
  end
end

Instance Attribute Details

#bitmask ⇒ Object

Returns the value of attribute bitmask.



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# File 'lib/handle/permissions.rb', line 3

def bitmask
  @bitmask
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/handle/permissions.rb', line 56

def inspect
  str = @flags.keys.select { |flag| self.read(flag) }.collect { |flag| flag.inspect }.join(', ')
  "[#{str}]"
end

#max ⇒ Object 



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# File 'lib/handle/permissions.rb', line 39

def max
  2**@flags.length-1
end

#read(flag) ⇒ Object 



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# File 'lib/handle/permissions.rb', line 43

def read(flag)
  self.bitmask & @flags[flag] > 0
end

#to_bool ⇒ Object 



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# File 'lib/handle/permissions.rb', line 31

def to_bool
  @flags.keys.collect { |flag| read(flag) }
end

#to_s ⇒ Object 



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# File 'lib/handle/permissions.rb', line 35

def to_s
  "%#{@flags.length}.#{@flags.length}b" % bitmask
end

#write(flag, value) ⇒ Object 



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# File 'lib/handle/permissions.rb', line 47

def write(flag, value)
  mask = @flags[flag]
  if value
    self.bitmask |= mask
  else
    self.bitmask &= (max - mask)
  end
end