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# encoding: UTF-8
require 'yaml'
require 'stringex/localization'
module Stringex
module Unidecoder
# Contains Unicode codepoints, loading as needed from YAML files
CODEPOINTS = Hash.new{|h, k|
h[k] = ::YAML.load_file(File.join(File.expand_path(File.dirname(__FILE__)), "unidecoder_data", "#{k}.yml"))
} unless defined?(CODEPOINTS)
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.chars.map{|char| decoded(char)}.join
end
# Returns character for the given Unicode codepoint
def encode(codepoint)
["0x#{codepoint}".to_i(16)].pack("U")
end
# Returns Unicode codepoint for the given character
def get_codepoint(character)
"%04x" % character.unpack("U")[0]
end
# Returns string indicating which file (and line) contains the
# transliteration value for the character
def in_yaml_file(character)
unpacked = character.unpack("U")[0]
"#{code_group(unpacked)}.yml (line #{grouped_point(unpacked) + 2})"
end
private
def decoded(character)
localized(character) || from_yaml(character)
end
def localized(character)
Localization.translate(:transliterations, character)
end
def from_yaml(character)
return character unless character.ord > 128
unpacked = character.unpack("U")[0]
CODEPOINTS[code_group(unpacked)][grouped_point(unpacked)]
rescue
# Hopefully this won't come up much
# TODO: Make this note something to the user that is reportable to me perhaps
"?"
end
# Returns the Unicode codepoint grouping for the given character
def code_group(unpacked_character)
"x%02x" % (unpacked_character >> 8)
end
# Returns the index of the given character in the YAML file for its codepoint group
def grouped_point(unpacked_character)
unpacked_character & 255
end
end
end
end
module Stringex
module StringExtensions
module PublicInstanceMethods
# Returns string with its UTF-8 characters transliterated to ASCII ones. Example:
#
# "⠋⠗⠁⠝⠉⠑".to_ascii #=> "france"
def to_ascii
Stringex::Unidecoder.decode(self)
end
end
end
end
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