Class: Kafo::DataTypes::Tuple

Inherits:
Kafo::DataType show all
Defined in:
lib/kafo/data_types/tuple.rb

Instance Method Summary collapse

Methods inherited from Kafo::DataType

#dump_default, new_from_string, parse_hash, register_type, split_arguments, types, unregister_type

Constructor Details

#initialize(*args) ⇒ Tuple

Returns a new instance of Tuple.



4
5
6
7
8
9
10
11
12
13
14
15
 
# File 'lib/kafo/data_types/tuple.rb', line 4

def initialize(*args)
  if args.last.to_s =~ /\d+/ || args.last.to_s == 'default'
    max = args.pop
    min = args.pop
  else
    max = :default
    min = :default
  end
  @max = (max.to_s == 'default') ? :infinite : max.to_i
  @min = (min.to_s == 'default') ? 0 : min.to_i
  @inner_types = args.map { |type| DataType.new_from_string(type) }
end

Instance Method Details

#condition_value(value) ⇒ Object 



17
18
19
 
# File 'lib/kafo/data_types/tuple.rb', line 17

def condition_value(value)
  "[ #{value.each_with_index.map { |v,i| inner_types(value)[i].condition_value(v) }.join(', ')} ]"
end

#multivalued? ⇒ Boolean

Returns:



21
22
23
 
# File 'lib/kafo/data_types/tuple.rb', line 21

def multivalued?
  true
end

#to_s ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/kafo/data_types/tuple.rb', line 25

def to_s
  type = "tuple of #{@inner_types.join(', ')}"
  if @min > 0 && @max == :infinite
    "#{type} (at least #{@min} items)"
  elsif @min == 0 && @max != :infinite
    "#{type} (up to #{@max} items)"
  elsif @min > 0 && @max != :infinite
    "#{type} (between #{@min} and #{@max} items)"
  else
    type
  end
end

#typecast(value) ⇒ Object 



38
39
40
41
42
43
44
45
46
47
 
# File 'lib/kafo/data_types/tuple.rb', line 38

def typecast(value)
  if value.nil?
    nil
  elsif value == ['EMPTY_ARRAY']
    []
  else
    values = [value].flatten
    values.each_with_index.map { |v,i| inner_types(values)[i].typecast(v) }
  end
end

#valid?(input, errors = []) ⇒ Boolean

Returns:



49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
 
# File 'lib/kafo/data_types/tuple.rb', line 49

def valid?(input, errors = [])
  unless input.is_a?(::Array)
    errors << "#{input.inspect} is not a valid tuple"
    return false
  end

  inner_errors = []
  input.each_with_index { |v,i| inner_types(input)[i].valid?(v, inner_errors) }
  unless inner_errors.empty?
    errors << "Elements of the tuple are invalid: #{inner_errors.join(', ')}"
  end

  errors << "The tuple must have at least #{@min} items" if input.size < @min
  errors << "The tuple must have at maximum #{@max} items" if @max != :infinite && input.size > @max

  return errors.empty?
end