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# frozen_string_literal: true
module ColorsHelper
HEX_COLOR_PATTERN = /\A\#(?:[0-9A-Fa-f]{3}){1,2}\Z/.freeze
def hex_color_to_rgb_array(hex_color)
raise ArgumentError, "invalid hex color `#{hex_color}`" unless hex_color =~ HEX_COLOR_PATTERN
hex_color.length == 7 ? hex_color[1, 7].scan(/.{2}/).map(&:hex) : hex_color[1, 4].scan(/./).map { |v| (v * 2).hex }
end
def rgb_array_to_hex_color(rgb_array)
raise ArgumentError, "invalid RGB array `#{rgb_array}`" unless rgb_array_valid?(rgb_array)
"##{rgb_array.map{ "%02x" % _1 }.join}"
end
private
def rgb_array_valid?(rgb_array)
rgb_array.is_a?(Array) && rgb_array.length == 3 && rgb_array.all?{ _1 >= 0 && _1 <= 255 }
end
end
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