Module: Dry::Mutations::Utils

Defined in:
lib/dry/mutations/utils/procs.rb,
lib/dry/mutations/utils/generic.rb,
lib/dry/mutations/utils/dry-mutations.rb

Overview

:nodoc:

Constant Summary collapse

USE_HASHIE_MASH =

Lazy detector for Hashie::Mash

TODO: Make it possible to choose friendly hash implementation

Falsey?(ENV['PLAIN_HASHES'], explicit: false) && begin
  require 'hashie/mash'
  true
rescue LoadError => e
  $stderr.puts [
    '[DRY] Could not find Hashie::Mash.',
    'You probably want to install it / add it to your Gemfile.',
    "Error: [#{e.message}]."
  ].join($/)
end
FALSEY = 
/\A#{Regexp.union(%w(0 skip false falsey no n)).source}\z/i
TRUTHY = 
/\A#{Regexp.union(%w(1 use true truthy yes y)).source}\z/i
ITSELF = 
->(h, k) { h[k] = k }
DRY_TO_MUTATIONS = 
{
  min_size?:    :min_length,
  max_size?:    :max_length,
  format?:      :matches,
  inclusion?:   :in, # deprecated in Dry
  included_in?: :in,
  gteq?:        :min,
  lteq?:        :max
}.freeze
MUTATIONS_TO_DRY = 
DRY_TO_MUTATIONS.invert.merge(default: :default?).freeze

Class Method Summary collapse

Class Method Details

.Camel(whatever) ⇒ Object 



33
34
35
36
37
 
# File 'lib/dry/mutations/utils/generic.rb', line 33

def self.Camel(whatever)
  whatever.to_s.split('__').map do |s|
    s.gsub(/(?:\A|_)(?<letter>\w)/) { $~[:letter].upcase }
  end.join('::')
end

.Constant(whatever) ⇒ Object 



39
40
41
 
# File 'lib/dry/mutations/utils/generic.rb', line 39

def self.Constant(whatever)
  ::Kernel.const_get(Camel(whatever))
end

.Falsey?(input, explicit: true) ⇒ Boolean

Returns:

  • (Boolean) 


7
8
9
 
# File 'lib/dry/mutations/utils/generic.rb', line 7

def self.Falsey? input, explicit: true
  explicit ? input.to_s =~ FALSEY : input.to_s !~ TRUTHY
end

.Guards(*keys, **params) ⇒ Object

Fuzzy converts params between different implementaions



27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
# File 'lib/dry/mutations/utils/dry-mutations.rb', line 27

def self.Guards *keys, **params
  return {} if params.empty? || params[:empty] # Mutations `empty?` guard takes precedence on all others

  keys = params.keys if keys.empty?
  keys.flatten! # allow array to be passed as the only parameter

  map = [DRY_TO_MUTATIONS, MUTATIONS_TO_DRY].detect do |h|
    (h.keys & keys).any?
  end || Hash.new(&ITSELF)

  map.values_at(*keys).zip(keys.map(&params.method(:[])))
     .to_h
     .tap { |h| h.delete(nil) }
end

.Hash(hash = {}) ⇒ Object

Converts a hash to a best available hash implementation

with stringified keys, since `Mutations` expect hash
keys to be strings.



46
47
48
49
50
51
52
53
54
55
 
# File 'lib/dry/mutations/utils/generic.rb', line 46

def self.Hash hash = {}
  case
  when USE_HASHIE_MASH
    Kernel.const_get('::Hashie::Mash').new(hash)
  when hash.respond_to?(:with_indifferent_access)
    hash.with_indifferent_access
  else
    hash.map { |k, v| [k.to_s, v] }.to_h
  end
end

.RawInputs(*args) ⇒ Object 



15
16
17
18
19
20
21
22
23
24
 
# File 'lib/dry/mutations/utils/dry-mutations.rb', line 15

def self.RawInputs *args
  args.inject(Utils.Hash({})) do |h, arg|
    h.merge! case arg
             when Hash then arg
             when ::Dry::Monads::Either::Right then arg.value
             when ::Dry::Monads::Either::Left then fail ArgumentError.new("Can’t accept Left value: #{args.inspect}.")
             else fail ArgumentError.new("All arguments must be hashes. Given: #{args.inspect}.") unless arg.is_a?(Hash)
             end
  end
end

.smart_send(receiver, *args, **params) ⇒ Object 



80
81
82
 
# File 'lib/dry/mutations/utils/dry-mutations.rb', line 80

def self.smart_send receiver, *args, **params
  params.empty? ? receiver.__send__(*args) : receiver.__send__(*args, **params)
end

.Snake(whatever, short: false, symbolize: false) ⇒ Object 



15
16
17
18
19
20
21
 
# File 'lib/dry/mutations/utils/generic.rb', line 15

def self.Snake(whatever, short: false, symbolize: false)
  result = whatever.to_s.split('::').map do |e|
    e.gsub(/(?<=[^\W_])(?=[A-Z])/, '_').downcase
  end
  result = short ? result.last : result.join('__')
  symbolize ? result.to_sym : result
end

.SnakeSafe(whatever, existing = [], update_existing: true, short: false, symbolize: false) ⇒ Object 



23
24
25
26
27
28
29
30
31
 
# File 'lib/dry/mutations/utils/generic.rb', line 23

def self.SnakeSafe(whatever, existing = [], update_existing: true, short: false, symbolize: false)
  result = Snake(whatever, short: short)
  str = loop do
    break result unless existing.include? result
    suffix = result[/(?<=_)\d+(?=\z)/]
    suffix.nil? ? result << '_1' : result[-suffix.length..-1] = (suffix.to_i + 1).to_s
  end.tap { |r| existing << r if update_existing }
  symbolize ? str.to_sym : str
end

.Truthy?(input, explicit: true) ⇒ Boolean

Returns:

  • (Boolean) 


11
12
13
 
# File 'lib/dry/mutations/utils/generic.rb', line 11

def self.Truthy? input, explicit: true
  explicit ? input.to_s =~ TRUTHY : input.to_s !~ FALSEY
end

.Type(type, **params) ⇒ Object 



42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/dry/mutations/utils/dry-mutations.rb', line 42

def self.Type type, **params
  case type.to_s
  when 'string'
    if Falsey?(params[:strip])
      :str?
    else
      # TODO: this silently coerces everything to be a string
      #       when `param[:strip]` is specified. This is likely OK, though.
      ::Dry::Types::Constructor.new(
        ::Dry::Types['strict.string'], fn: ->(v) { v.to_s.strip }
      )
    end
  when 'date'
    ::Dry::Types::Constructor.new(
      ::Dry::Types['strict.date'], fn: ->(v) { v.is_a?(Date) ? v : (Date.parse(v.to_s) rescue v) }
    )
  when 'integer'
    ::Dry::Types::Constructor.new(
      ::Dry::Types['strict.int'], fn: ->(v) { v.is_a?(Integer) ? v : (v.to_i rescue v) }
    )
  when 'boolean'
    ::Dry::Types::Constructor.new(
      ::Dry::Types['strict.bool'], fn: ->(v) do
        case v
        when TrueClass, FalseClass then v
        when NilClass then false
        when String
          case
          when Falsey?(v) then false
          when Truthy?(v) then true
          end
        end
      end
    )
  else :"#{type}?"
  end
end

.Λ(input, **params) ⇒ Object 



4
5
6
7
8
9
10
11
 
# File 'lib/dry/mutations/utils/procs.rb', line 4

def self.Λ input, **params
  case
  when params[:method] then input.method(params.delete[:method].to_sym).to_proc
  when input.respond_to?(:to_proc) then input.to_proc
  when input.respond_to?(:call) then input.method(:call).to_proc
  else fail ArgumentError, "The executor given can not be executed (forgot to specify :method param?)"
  end
end