Class: Fixnum

Inherits:
Object
  • Object
show all
Defined in:
lib/indis-core/binaryops_fixnum.rb,
lib/indis-core/binaryops_string.rb

Overview

BinaryopsFixnum is a lightweight BinaryopsString, a few methods extending Fixnum with enough operations so that it’s usable in bit calculations.

Instance Method Summary collapse

Instance Method Details

#[](range) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/indis-core/binaryops_fixnum.rb', line 49

def [](range)
  return old_range(range) unless range.is_a?(Range)
  raise ArgumentError, "Only inclusive ranges are supported" if range.exclude_end?
  (self >> range.begin) & ((1 << (range.end-range.begin+1)) - 1)
end

#bitlen ⇒ Object 



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# File 'lib/indis-core/binaryops_fixnum.rb', line 26

def bitlen
  @bitlen ||= self.to_s(2).length
end

#bitlen=(bitlen) ⇒ Object 



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# File 'lib/indis-core/binaryops_fixnum.rb', line 22

def bitlen=(bitlen)
  @bitlen = bitlen
end

#msb ⇒ Object 



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# File 'lib/indis-core/binaryops_fixnum.rb', line 35

def msb
  self >> (self.bitlen-1)
end

#old_range ⇒ Object 



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# File 'lib/indis-core/binaryops_fixnum.rb', line 47

alias :old_range :[]

#set_bitlen(i) ⇒ Object 



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# File 'lib/indis-core/binaryops_fixnum.rb', line 30

def set_bitlen(i)
  @bitlen = i
  self
end

#to_bo ⇒ Object

Helper method to convert Fixnum to BinaryopsString



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# File 'lib/indis-core/binaryops_string.rb', line 141

def to_bo
  BinaryopsString.new(self.to_s(2))
end

#to_boz(len) ⇒ Object

Helper method to convert Fixnum to BinaryopsString with given length (zero-padded)



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# File 'lib/indis-core/binaryops_string.rb', line 147

def to_boz(len)
  BinaryopsString.new(self.to_s(2)).zero_extend(len)
end

#to_signed ⇒ Object 



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# File 'lib/indis-core/binaryops_fixnum.rb', line 39

def to_signed
  if msb == 1
    - ((1 << @bitlen) - self)
  else
    self
  end
end