Module: Random::Formatter

Included in:
Random, Random
Defined in:
opal/opal/corelib/random/formatter.rb

Instance Method Summary collapse

Instance Method Details

#alphanumeric(count = nil) ⇒ Object


111
112
113
114
115
116
117
# File 'opal/opal/corelib/random/formatter.rb', line 111

def alphanumeric(count = nil)
  count = Random._verify_count(count)
  map = ['0'..'9', 'a'..'z', 'A'..'Z'].map(&:to_a).flatten
  Array.new(count) do |i|
    map[random_number(map.length)]
  end.join
end

#base64(count = nil) ⇒ Object


19
20
21
# File 'opal/opal/corelib/random/formatter.rb', line 19

def base64(count = nil)
  Base64.strict_encode64(random_bytes(count)).encode('US-ASCII')
end

#hex(count = nil) ⇒ Object


3
4
5
6
7
8
9
10
11
12
13
# File 'opal/opal/corelib/random/formatter.rb', line 3

def hex(count = nil)
  count = Random._verify_count(count)
  %x{
    var bytes = #{bytes(count)};
    var out = "";
    for (var i = 0; i < #{count}; i++) {
      out += bytes.charCodeAt(i).toString(16).padStart(2, '0');
    }
    return #{`out`.encode('US-ASCII')};
  }
end

#random_bytes(count = nil) ⇒ Object


15
16
17
# File 'opal/opal/corelib/random/formatter.rb', line 15

def random_bytes(count = nil)
  bytes(count)
end

#random_floatObject

Implemented in terms of #bytes for SecureRandom, but Random overrides this method to implement #bytes in terms of #random_float. Not part of standard Ruby interface - use random_number for portability.


39
40
41
42
43
44
45
46
47
# File 'opal/opal/corelib/random/formatter.rb', line 39

def random_float
  bs = bytes(4)
  num = 0
  4.times do |i|
    num <<= 8
    num |= bs[i].ord
  end
  num.abs / 0x7fffffff
end

#random_number(limit = undefined) ⇒ Object


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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
# File 'opal/opal/corelib/random/formatter.rb', line 49

def random_number(limit = undefined)
  %x{
    function randomFloat() {
      return #{random_float};
    }

    function randomInt(max) {
      return Math.floor(randomFloat() * max);
    }

    function randomRange() {
      var min = limit.begin,
          max = limit.end;

      if (min === nil || max === nil) {
        return nil;
      }

      var length = max - min;

      if (length < 0) {
        return nil;
      }

      if (length === 0) {
        return min;
      }

      if (max % 1 === 0 && min % 1 === 0 && !limit.excl) {
        length++;
      }

      return randomInt(length) + min;
    }

    if (limit == null) {
      return randomFloat();
    } else if (limit.$$is_range) {
      return randomRange();
    } else if (limit.$$is_number) {
      if (limit <= 0) {
        #{raise ArgumentError, "invalid argument - #{limit}"}
      }

      if (limit % 1 === 0) {
        // integer
        return randomInt(limit);
      } else {
        return randomFloat() * limit;
      }
    } else {
      limit = #{Opal.coerce_to!(limit, Integer, :to_int)};

      if (limit <= 0) {
        #{raise ArgumentError, "invalid argument - #{limit}"}
      }

      return randomInt(limit);
    }
  }
end

#urlsafe_base64(count = nil, padding = false) ⇒ Object


23
24
25
# File 'opal/opal/corelib/random/formatter.rb', line 23

def urlsafe_base64(count = nil, padding = false)
  Base64.urlsafe_encode64(random_bytes(count), padding).encode('US-ASCII')
end

#uuidObject


27
28
29
30
31
32
33
34
# File 'opal/opal/corelib/random/formatter.rb', line 27

def uuid
  str = hex(16).split('')
  str[12] = '4'
  str[16] = `(parseInt(#{str[16]}, 16) & 3 | 8).toString(16)`
  str = [str[0...8], str[8...12], str[12...16], str[16...20], str[20...32]]
  str = str.map(&:join)
  str.join('-')
end