Class: Measurement::Unit

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby-measurement/unit.rb

Defined Under Namespace

Classes: Builder

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ Unit

Returns a new instance of Unit.



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# File 'lib/ruby-measurement/unit.rb', line 9

def initialize(name)
  @name = name.to_s
  @aliases = Set.new
  @conversions = {}
  add_alias(name)
end

Instance Attribute Details

#aliases ⇒ Object (readonly)

Returns the value of attribute aliases.



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# File 'lib/ruby-measurement/unit.rb', line 5

def aliases
  @aliases
end

#conversions ⇒ Object (readonly)

Returns the value of attribute conversions.



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# File 'lib/ruby-measurement/unit.rb', line 5

def conversions
  @conversions
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/ruby-measurement/unit.rb', line 5

def name
  @name
end

Class Method Details

.[](unit_name) ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 57

def self.[](unit_name)
  @definitions[unit_name.to_s.downcase]
end

.define(unit_name, &block) ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 53

def self.define(unit_name, &block)
  Builder.new(unit_name, &block)
end

.names ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 61

def self.names
  @definitions.keys
end

Instance Method Details

#==(obj) ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 47

def ==(obj)
  obj.kind_of?(self.class) && name == obj.name && aliases == obj.aliases && conversions.all? do |key, proc|
    [-2.5, -1, 0, 1, 2.5].all? { |n| proc.call(n) == obj.conversions[key].call(n) }
  end
end

#add_alias(*args) ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 16

def add_alias(*args)
  args.each do |unit_alias|
    @aliases << unit_alias.to_s
    self.class[unit_alias] = self
  end
end

#add_conversion(unit_name, &block) ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 23

def add_conversion(unit_name, &block)
  @conversions[unit_name.to_s] = block
end

#conversion(unit_name) ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 27

def conversion(unit_name)
  unit = self.class[unit_name]
  return nil unless unit
  
  unit.aliases.each do |unit_alias|
    conversion = @conversions[unit_alias.to_s]
    return conversion if conversion
  end
  
  nil
end

#inspect ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 39

def inspect
  to_s
end

#to_s ⇒ Object 



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# File 'lib/ruby-measurement/unit.rb', line 43

def to_s
  name
end