Class: ActiveFacts::CQL::Compiler::Unit

Inherits:
Definition
  • Object
show all
Defined in:
lib/activefacts/cql/compiler/value_type.rb

Instance Attribute Summary

Attributes inherited from Definition

#constellation, #tree, #vocabulary

Instance Method Summary collapse

Methods inherited from Definition

#all_bindings_in_clauses, #build_all_steps, #build_steps, #build_variables, #source

Constructor Details

#initialize(singular, plural, numerator, denominator, offset, base_units, approximately, ephemera_url) ⇒ Unit

Returns a new instance of Unit.



6
7
8
9
10
11
12
13
14
 
# File 'lib/activefacts/cql/compiler/value_type.rb', line 6

def initialize singular, plural, numerator, denominator, offset, base_units, approximately, ephemera_url
  @singular = singular
  @plural = plural
  @numerator, @denominator = numerator, denominator
  @offset = offset
  @base_units = base_units  # An array of pairs, each [unit_name, power]
  @approximately = approximately
  @ephemera_url = ephemera_url
end

Instance Method Details

#compile ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
 
# File 'lib/activefacts/cql/compiler/value_type.rb', line 16

def compile
  if (@numerator.to_f / @denominator.to_i != 1.0)
    coefficient = @constellation.Coefficient(
        @numerator,
        @denominator.to_i,
        !@approximately
        # REVISIT: Activefacts-api is complaining at present. The following is better and should work:
        # :numerator => @numerator,
        # :denominator => @denominator.to_i,
        # :is_precise => !@approximately
      )
  else
    coefficient = nil
  end
  @offset = nil if @offset.to_f == 0

  debug :units, "Defining new unit #{@singular}#{@plural ? "/"+@plural : ""}" do
    debug :units, "Coefficient is #{coefficient.numerator}#{coefficient.denominator != 1 ? "/#{coefficient.denominator}" : ""} #{coefficient.is_precise ? "exactly" : "approximately"}" if coefficient
    debug :units, "Offset is #{@offset}" if @offset
    raise "Redefinition of unit #{@singular}" if @constellation.Unit.values.detect{|u| u.name == @singular}
    raise "Redefinition of unit #{@plural}" if @constellation.Unit.values.detect{|u| u.name == @plural}
    unit = @constellation.Unit(:new,
        :name => @singular,
        :plural_name => @plural,
        :coefficient => coefficient,
        :offset => @offset,
        :is_fundamental => @base_units.empty?,
        :ephemera_url => @ephemera_url,
        :vocabulary => @vocabulary
      )
    @base_units.each do |base_unit, exponent|
      base = @constellation.Unit.values.detect{|u| u.name == base_unit || u.plural_name == base_unit }
      debug :units, "Base unit #{base_unit}^#{exponent} #{base ? "" : "(implicitly fundamental)"}"
      base ||= @constellation.Unit(:new, :name => base_unit, :is_fundamental => true, :vocabulary => @vocabulary)
      @constellation.Derivation(:derived_unit => unit, :base_unit => base, :exponent => exponent)
    end
=begin
    if @plural
      plural_unit = @constellation.Unit(:new,
          :name => @plural,
          :is_fundamental => false,
          :vocabulary => @vocabulary
        )
      @constellation.Derivation(:derived_unit => plural_unit, :base_unit => unit, :exponent => 1)
    end
=end
    unit
  end
end

#inspect ⇒ Object 



66
67
68
 
# File 'lib/activefacts/cql/compiler/value_type.rb', line 66

def inspect
  to_s
end

#to_s ⇒ Object 



70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
 
# File 'lib/activefacts/cql/compiler/value_type.rb', line 70

def to_s
  super + "Unit(#{
    @singular
  }#{
    @plural ? '/'+@plural : ''
  }) is #{
    @numerator
  }/#{
    @denominator
  }+#{
    @offset
  } #{
    @base_units.map{|b,e|
      b+'^'+e.to_s
    }*'*'
  }"
end