# -*- coding: UTF-8 -*-

from plone.i18n.normalizer.interfaces import INormalizer
from zope.interface import implements
from plone.i18n.normalizer.base import mapUnicode

# Ukrainian character mapping (according to BGN/PCGN romanization system)
mapping = {
    0x0410: u'A', 0x0430: u'a',
    0x0411: u'B', 0x0431: u'b',
    0x0412: u'V', 0x0432: u'v',
    0x0413: u'H', 0x0433: u'h',
    0x0490: u'G', 0x0491: u'g',
    0x0414: u'D', 0x0434: u'd',
    0x0415: u'E', 0x0435: u'e',
    0x0404: u'YE', 0x0454: u'ye',
    0x0416: u'ZH', 0x0436: u'zh',
    0x0417: u'Z', 0x0437: u'z',
    0x0418: u'Y', 0x0438: u'y',
    0x0406: u'I', 0x0456: u'i',
    0x0407: u'YI', 0x0457: u'yi',
    0x0419: u'Y', 0x0439: u'y',
    0x041a: u'K', 0x043a: u'k',
    0x041b: u'L', 0x043b: u'l',
    0x041c: u'M', 0x043c: u'm',
    0x041d: u'N', 0x043d: u'n',
    0x041e: u'O', 0x043e: u'o',
    0x041f: u'P', 0x043f: u'p',
    0x0420: u'R', 0x0440: u'r',
    0x0421: u'S', 0x0441: u's',
    0x0422: u'T', 0x0442: u't',
    0x0423: u'U', 0x0443: u'u',
    0x0424: u'F', 0x0444: u'f',
    0x0425: u'KH', 0x0445: u'kh',
    0x0426: u'TS', 0x0446: u'ts',
    0x0427: u'CH', 0x0447: u'ch',
    0x0428: u'SH', 0x0448: u'sh',
    0x0429: u'SHCH', 0x0449: u'shch',
    0x042c: u'', 0x044c: u'',
    0x042e: u'YU', 0x044e: u'yu',
    0x042f: u'YA', 0x044f: u'ya',
}

class Normalizer(object):
    """
    This normalizer can normalize any unicode string and returns a version
    that only contains of ASCII characters.

    Let's make sure that this implementation actually fulfills the API.

      >>> from zope.interface.verify import verifyClass
      >>> verifyClass(INormalizer, Normalizer)
      True

      >>> norm = Normalizer()
      >>> norm.normalize(u'\u041f\u043b\u043e\u043d')
      'Plon'
    """
    implements(INormalizer)

    def normalize(self, text, locale=None, max_length=None):
        """
        Returns a normalized text. text has to be a unicode string.
        """
        return mapUnicode(text, mapping=mapping)

normalizer = Normalizer()