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require "yaml"
module Unidecoder
# Contains Unicode codepoints, loading as needed from YAML files
CODEPOINTS = Hash.new { |h, k|
h[k] = YAML::load_file(File.join(File.dirname(__FILE__), "data", "#{k}.yml"))
}
class << self
# Returns string with its UTF-8 characters transliterated to ASCII ones.
#
# You're probably better off just using the added String#to_ascii.
def decode(string)
string.gsub(/[^\x00-\x7f]/u) do |codepoint|
begin
CODEPOINTS[code_group(codepoint)][grouped_point(codepoint)]
rescue
"?"
end
end
end
# These are private methods, just shown here to illustrate the code.
private
# Returns the Unicode codepoint grouping for the given character.
def code_group(character)
"x%02x" % (character.unpack("U")[0] >> 8)
end
# Returns the index of the given character in the YAML file for its codepoint group.
def grouped_point(character)
character.unpack("U")[0] & 255
end
end
end
class String
# Returns string with its UTF-8 characters transliterated to ASCII ones. Example:
#
# "⠋⠗⠁⠝⠉⠑".to_ascii #=> "braille"
def to_ascii
Unidecoder::decode(self)
end
end
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