Module: Unitwise::Compatible

Included in:
Atom, Scale, Term, Unit
Defined in:
lib/unitwise/compatible.rb

Overview

Compatible is used to establish compatibility between units, terms, or measurements. This is done by determining the objects atomic composition represented as a Signed Multiset.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



8
9
10
 
# File 'lib/unitwise/compatible.rb', line 8

def self.included(base)
  base.send :include, Comparable
end

Instance Method Details

#<=>(other) ⇒ -1 0 1

Compare whether the instance is greater, less than or equal to other.

Returns:

  • (-1 0 1) 


47
48
49
50
51
 
# File 'lib/unitwise/compatible.rb', line 47

def <=>(other)
  if other.respond_to?(:composition) && compatible_with?(other)
    scalar <=> other.scalar
  end
end

#compatible_with?(other) ⇒ true false

Determine if this instance is similar to or compatible with other

Returns:

  • (true false) 


40
41
42
 
# File 'lib/unitwise/compatible.rb', line 40

def compatible_with?(other)
  self.composition == other.composition
end

#composition ⇒ SignedMultiset

A representation of a unit based on the atoms it's derived from.

Returns:

  • (SignedMultiset) 


15
16
17
18
19
 
# File 'lib/unitwise/compatible.rb', line 15

def composition
  root_terms.reduce(SignedMultiset.new) do |s, t|
    s.increment(t.atom.dim, t.exponent) if t.atom; s
  end
end

#composition_string ⇒ String

A string representation of a unit based on the atoms it's derived from

Returns:

  • (String) 


31
32
33
34
35
 
# File 'lib/unitwise/compatible.rb', line 31

def composition_string
  composition.sort.map do |k,v|
    v == 1 ? k.to_s : "#{k}#{v}"
  end.join('.')
end

#dim ⇒ String

Define a default #dim for included classes.

Returns:

  • (String) 


24
25
26
 
# File 'lib/unitwise/compatible.rb', line 24

def dim
  composition_string
end