MathViz::Unit

# File lib/mathviz.rb, line 127
def self.binop(other)
  alias_method other, :binary_operator
end

# File lib/mathviz.rb, line 108
def initialize(h = nil)
  @unit = Hash.new(0)
  case h
  when Hash; @unit.merge!(h); normalize!
  when Symbol; @unit[h] = 1
  end
  @unit.freeze
  freeze
end

# File lib/mathviz.rb, line 141
def *(other)
  x = @unit.dup
  other.unit.each do |u,power|
    x[u] += power
  end
  MathViz::Unit.new(x)
end

# File lib/mathviz.rb, line 149
def /(other)
  x = @unit.dup
  other.unit.each do |u,power|
    x[u] -= power
  end
  MathViz::Unit.new(x)
end

# File lib/mathviz.rb, line 119
def binary_operator(other)
  if (unit != other.unit)
    #p "#{to_s} !+- #{other.to_s}"
    return MathViz::Unit.new(:ERROR)
  end
  return self
end

# File lib/mathviz.rb, line 161
def denominator
  unit.reject {|u,power| power > 0}
end

# File lib/mathviz.rb, line 157
def numerator
  unit.reject {|u,power| power < 0}
end

# File lib/mathviz.rb, line 165
def to_s
  n = stream(numerator)
  d = stream(denominator)
  return '' unless (n || d)
  return "#{n||1}/#{d}" if d
  return n
end