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pinyin_tone_converter.rb
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pinyin_tone_converter.rb
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# -*- coding: utf-8 -*-
# Copyright 2012 Douglas Triggs ([email protected]), All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License. You may
# obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
class PinyinToneConverter
@@conversion_list = [['a', 'e', 'i', 'o', 'u', 'ü'],
['ā', 'ē', 'ī', 'ō', 'ū', 'ǖ'],
['á', 'é', 'í', 'ó', 'ú', 'ǘ'],
['ǎ', 'ě', 'ǐ', 'ǒ', 'ǔ', 'ǚ'],
['à', 'è', 'ì', 'ò', 'ù', 'ǜ']]
@@preferred_vowels = ['a', 'e', 'o', 'u']
@@all_vowels = ['ā', 'ē', 'ī', 'ō', 'ū', 'ǖ',
'á', 'é', 'í', 'ó', 'ú', 'ǘ',
'ǎ', 'ě', 'ǐ', 'ǒ', 'ǔ', 'ǚ',
'à', 'è', 'ì', 'ò', 'ù', 'ǜ']
def self.number_to_utf8( string )
# Convert a numbered pinyin string (e.g., "zhong1 wen2") to UTF-8
# equivalent with diacriticals ("zhōng wén"). Syllables must be
# delimited by numbers, spaces, or some non-alphabetic character
# (which will be otherwise ignored)
string = string.downcase
syllable = ""
utf8 = ""
string.each_char do |char|
if ( char == 'v' )
syllable += 'ü'
elsif ( (char >= 'a' && char <= 'z') || char == 'ü')
syllable += char
elsif ( char == ':' )
if ( syllable[-1] == 'u' )
syllable[-1] = 'ü'
end
elsif ( char >= '1' && char <= '4' )
tone = char.to_i
# Tone marker should go on first vowel that's not i or ü;
# only use i or ü when that's the only vowel available
mark = nil
0.upto( syllable.length - 1 ) do |index|
if ( @@preferred_vowels.include?( syllable[index] ) )
mark = index
break
elsif ( @@conversion_list[0].include?( syllable[index] ) )
mark = index
end
end
if (mark)
index = @@conversion_list[0].index( syllable[mark] )
syllable[mark] = @@conversion_list[tone][index]
end
utf8 += syllable
if (syllable.length > 0)
utf8 += " "
end
syllable = ""
else
# All other chars -- spaces, anything -- break syllables, but
# otherwise ignored
utf8 += syllable
if (syllable.length > 0)
utf8 += " "
end
syllable = ""
end
end
utf8 += syllable
utf8.rstrip
end
def self.utf8_to_number( string )
# Convert a UTF-8 pinyin string with tone diacriticals (e.g.,
# "zhōng wén") to an ASCII numbered pinyin string equivalent
# ("zhong1 wen2"). Syllables must be delimted by some
# non-alphabetic character, which will be otherwise ignored
string = string.downcase
syllable = ""
pinyin = ""
tone = 0
string.each_char do |char|
if ( char >= 'a' && char <= 'z' )
syllable += char
elsif (char == 'ü')
syllable += 'v'
elsif ( @@all_vowels.include?(char) )
1.upto(4) do |x|
if ( @@conversion_list[x].include?(char) )
index = @@conversion_list[x].index(char)
new = @@conversion_list[0][index]
if (new == 'ü')
new = 'v'
end
syllable += new
tone = x
end
end
else
pinyin += syllable
if (tone > 0)
pinyin += tone.to_s
tone = 0
end
if (syllable.length > 0)
pinyin += " "
end
syllable = ""
end
end
pinyin += syllable
if (tone > 0)
pinyin += tone.to_s
tone = 0
end
pinyin.rstrip
end
end