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# frozen_string_literal: true
module Faker
class String < Base
class << self
##
# Produces a random UTF-8 string with optional nested length selectors.
#
# @param length [Integer, Range, Array<Integer, Range, nil>] The length of produced string and/or specific UTF-8 characters to use.
# @return [String]
#
# @example
# Faker::String.random #=> "3 뇦\u0017&y\u{3A109}$8^4* 녹豿4좘툢ꔾ쉙6ɉ\uA6 8TN畀챵|\"3쇤Ŵ"
# Faker::String.random(length: 4) #=> "⼨%0*"
# Faker::String.random(length: 3..12) #=> "\u{69FDC};秨툫"
# Faker::String.random(length: [0, 6]) #=> "I轤𣴒P溟L"
# Faker::String.random(length: [1, (2..5), [3, 6], nil]) #=> "葓L#ћ"
#
# @faker.version 1.9.0
def random(legacy_length = NOT_GIVEN, length: 32)
warn_for_deprecated_arguments do |keywords|
keywords << :length if legacy_length != NOT_GIVEN
end
utf8string select_a length
end
private
def select_a(length)
if length.class.included_modules.include? Enumerable
select_a sample(length.to_enum.to_a)
else
length # recursive base case
end
end
def utf8string(length)
ratio = char_space_ratio
(1..length.to_i).map do
space_or_utf8_char ratio
end.join
end
def space_or_utf8_char(ratio)
sample [32.chr(Encoding::UTF_8), [utf8character] * ratio].flatten
end
def char_space_ratio
sample [2, [3] * 5, [5] * 17, [7] * 11, 11, 191].flatten
end
def utf8character
sample([
rand(32..90), # latin alphabet
rand(128), # 7-bit ASCII
rand(0xd800), # utf-8 codepoints below utf-16 surrogate halves
rand(57_344..1_114_111) # utf-8 codepoints above utf-16 surrogate halves
]).chr(Encoding::UTF_8)
end
end
end
end
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