class BaseN::Encoder
Constants
- PRIMITIVES
Attributes
base[RW]
Public Class Methods
highest_supported()
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# File lib/base_n.rb, line 29 def self.highest_supported new PRIMITIVES.size end
new(base)
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# File lib/base_n.rb, line 23 def initialize base self.base = base raise "I only support bases 2 and above" if base < 2 raise "I only support up to base #{primitives.size}" if base > primitives.size end
Public Instance Methods
case_sensitive?()
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# File lib/base_n.rb, line 33 def case_sensitive? base > 36 end
decode(subject)
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# File lib/base_n.rb, line 41 def decode subject r = subject.representation r.upcase! unless Encoder.new(subject.base).case_sensitive? s = r.reverse.split('') total = 0 s.each_with_index do |char, index| if ord = primitives.index(char) total += ord * (base ** index) else raise ArgumentError, "#{subject} has #{char} which is not valid" end end total end
encode(subject)
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# File lib/base_n.rb, line 57 def encode subject subject = Number.new subject.to_s, 10 unless subject.kind_of? BaseN::Number return subject if subject.base == base i = Encoder.new(subject.base).decode(subject) s = '' while i > 0 s << primitives[i.modulo(base)] i /= base end s = '0' if s == '' Number.new s.reverse, base end
primitives()
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# File lib/base_n.rb, line 37 def primitives PRIMITIVES[0, base] end