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# frozen_string_literal: true
module RQRCode
module Export
module ANSI
#
# Returns a string of the QR code as
# characters writen with ANSI background set.
#
# Options:
# light: Foreground ("\033[47m")
# dark: Background ANSI code. ("\033[40m")
# fill_character: The written character. (' ')
# quiet_zone_size: (4)
#
def as_ansi(options = {})
options = {
light: "\033[47m",
dark: "\033[40m",
fill_character: " ",
quiet_zone_size: 4
}.merge(options)
normal = "\033[m\n"
light = options.fetch(:light)
dark = options.fetch(:dark)
fill_character = options.fetch(:fill_character)
quiet_zone_size = options.fetch(:quiet_zone_size)
output = []
@qrcode.modules.each_index do |c|
# start row with quiet zone
row = light + fill_character * quiet_zone_size
previous_dark = false
@qrcode.modules.each_index do |r|
if @qrcode.checked?(c, r)
if previous_dark != true
row << dark
previous_dark = true
end
elsif previous_dark != false
# light
row << light
previous_dark = false
end
row << fill_character
end
# add quiet zone
if previous_dark != false
row << light
end
row << fill_character * quiet_zone_size
# always end with reset and newline
row << normal
output << row
end
# count the row width so we can add quiet zone rows
width = output.first.scan(fill_character).length
quiet_row = light + fill_character * width + normal
quiet_rows = quiet_row * quiet_zone_size
quiet_rows + output.join + quiet_rows
end
end
end
end
RQRCode::QRCode.send :include, RQRCode::Export::ANSI
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