Source code for tamil.utf8

## This Python file uses the following encoding: utf-8
## (C) 2007, 2008, 2013, 2015, 2016 Muthiah Annamalai <>
## (C) 2013 msathia <>
## This file is dual licensed - originally GPL v3 from Ezhil, and
## then as part of open-tamil package in MIT license.
## Licensed under GPL Version 3

from sys import version
from copy import copy
import re
import operator

PYTHON3 = version > '3'
del version

    import functools

## constants
TA_ACCENT_LEN = 13 #12 + 1
TA_LETTERS_LEN = 247 + 6*12 + 22 + 4 - TA_AGARAM_LEN - 4 #323

[docs]def to_unicode_repr( _letter ): """ helpful in situations where browser/app may recognize Unicode encoding in the \u0b8e type syntax but not actual unicode glyph/code-point""" # Python 2-3 compatible return u"u'"+ u"".join( [ u"\\u%04x"%ord(l) for l in _letter ] ) + u"'"
[docs]def letters_to_py( _letters ): """ return list of letters e.g. uyir_letters as a Python list """ return u"[u'"+u"',u'".join( _letters )+u"']"
# List of letters you can use uyir_letters = [u"அ",u"ஆ",u"இ",u"ஈ",u"உ",u"ஊ",u"எ",u"ஏ",u"ஐ",u"ஒ",u"ஓ",u"ஔ"] vowel_a = u"அ" vowel_aa = u"ஆ" vowel_i = u"இ" vowel_ii = u"ஈ" vowel_u = u"உ" vowel_uu = u"ஊ" vowel_e = u"எ" vowel_ee = u"ஏ" vowel_ai = u"ஐ" vowel_o = u"ஒ" vowel_oo = u"ஓ" vowel_au = u"ஔ" ayudha_letter = u"ஃ" kuril_letters = [u"அ", u"இ", u"உ", u"எ", u"ஒ"] nedil_letters = [u"ஆ", u"ஈ", u"ஊ", u"ஏ", u"ஓ"] vallinam_letters = [u"க்", u"ச்", u"ட்", u"த்", u"ப்", u"ற்"] mellinam_letters = [u"ங்", u"ஞ்", u"ண்", u"ந்", u"ம்", u"ன்"] idayinam_letters = [u"ய்", u"ர்", u"ல்", u"வ்", u"ழ்", u"ள்"] mei_letters = [u"க்",u"ச்",u"ட்",u"த்",u"ப்",u"ற்", u"ஞ்",u"ங்",u"ண்",u"ந்",u"ம்",u"ன்", u"ய்",u"ர்",u"ல்",u"வ்",u"ழ்",u"ள்" ] accent_symbols = [u"",u"ா",u"ி",u"ீ",u"ு",u"ூ", u"ெ",u"ே",u"ை",u"ொ",u"ோ",u"ௌ",u"ஃ"] accent_aa = accent_symbols[1] accent_i = accent_symbols[2] accent_u = accent_symbols[3] accent_uu = accent_symbols[4] accent_e = accent_symbols[5] accent_ee = accent_symbols[6] accent_ai = accent_symbols[7] accent_o = accent_symbols[8] accent_oo = accent_symbols[9] accent_au = accent_symbols[10] pulli_symbols = [u"்"] agaram_letters = [u"க",u"ச",u"ட",u"த",u"ப",u"ற", u"ஞ",u"ங",u"ண",u"ந",u"ம",u"ன", u"ய",u"ர",u"ல",u"வ",u"ழ",u"ள"] consonant_ka = u"க" consonant_nga = u"ங" consonant_ca = u"ச" consonant_ja = u"ஜ" consonant_nya = u"ஞ" consonant_tta = u"ட" consonant_nna = u"ண" consonant_nnna = u"ன" consonant_ta = u"த" consonant_tha = u"த" consonant_na = u"ந" consonant_pa = u"ப" consonant_ma = u"ம" consonant_ya = u"ய" consonant_ra = u"ர" consonant_rra = u"ற" consonant_la = u"ல" consonant_lla = u"ள" consonant_llla = u"ழ" consonant_zha = u"ழ" consonant_va = u"வ" sanskrit_letters = [u"ஶ",u"ஜ",u"ஷ", u"ஸ",u"ஹ",u"க்ஷ"] sanskrit_mei_letters =[u"ஶ்",u"ஜ்",u"ஷ்", u"ஸ்",u"ஹ்",u"க்ஷ்"] grantha_mei_letters = copy(mei_letters) grantha_mei_letters.extend(sanskrit_mei_letters) grantha_agaram_letters = copy(agaram_letters) grantha_agaram_letters.extend(sanskrit_letters) uyirmei_letters = [ u"க" ,u"கா" ,u"கி" ,u"கீ" ,u"கு" ,u"கூ" ,u"கெ" ,u"கே" ,u"கை" ,u"கொ" ,u"கோ" ,u"கௌ" , u"ச" ,u"சா" ,u"சி" ,u"சீ" ,u"சு" ,u"சூ" ,u"செ" ,u"சே" ,u"சை" ,u"சொ" ,u"சோ" ,u"சௌ" , u"ட" ,u"டா" ,u"டி" ,u"டீ" ,u"டு" ,u"டூ" ,u"டெ" ,u"டே" ,u"டை" ,u"டொ" ,u"டோ" ,u"டௌ", u"த" ,u"தா" ,u"தி" ,u"தீ" ,u"து" ,u"தூ" ,u"தெ" ,u"தே" ,u"தை" ,u"தொ" ,u"தோ" ,u"தௌ", u"ப" ,u"பா" ,u"பி" ,u"பீ" ,u"பு" ,u"பூ" ,u"பெ" ,u"பே" ,u"பை" ,u"பொ" ,u"போ" ,u"பௌ" , u"ற" ,u"றா" ,u"றி" ,u"றீ" ,u"று" ,u"றூ" ,u"றெ" ,u"றே" ,u"றை" ,u"றொ" ,u"றோ" ,u"றௌ", u"ஞ" ,u"ஞா" ,u"ஞி" ,u"ஞீ" ,u"ஞு" ,u"ஞூ" ,u"ஞெ" ,u"ஞே" ,u"ஞை" ,u"ஞொ" ,u"ஞோ" ,u"ஞௌ" , u"ங" ,u"ஙா" ,u"ஙி" ,u"ஙீ" ,u"ஙு" ,u"ஙூ" ,u"ஙெ" ,u"ஙே" ,u"ஙை" ,u"ஙொ" ,u"ஙோ" ,u"ஙௌ" , u"ண" ,u"ணா" ,u"ணி" ,u"ணீ" ,u"ணு" ,u"ணூ" ,u"ணெ" ,u"ணே" ,u"ணை" ,u"ணொ" ,u"ணோ" ,u"ணௌ" , u"ந" ,u"நா" ,u"நி" ,u"நீ" ,u"நு" ,u"நூ" ,u"நெ" ,u"நே" ,u"நை" ,u"நொ" ,u"நோ" ,u"நௌ" , u"ம" ,u"மா" ,u"மி" ,u"மீ" ,u"மு" ,u"மூ" ,u"மெ" ,u"மே" ,u"மை" ,u"மொ" ,u"மோ" ,u"மௌ" , u"ன" ,u"னா" ,u"னி" ,u"னீ" ,u"னு" ,u"னூ" ,u"னெ" ,u"னே" ,u"னை" ,u"னொ" ,u"னோ" ,u"னௌ", u"ய" ,u"யா" ,u"யி" ,u"யீ" ,u"யு" ,u"யூ" ,u"யெ" ,u"யே" ,u"யை" ,u"யொ" ,u"யோ" ,u"யௌ", u"ர" ,u"ரா" ,u"ரி" ,u"ரீ" ,u"ரு" ,u"ரூ" ,u"ரெ" ,u"ரே" ,u"ரை" ,u"ரொ" ,u"ரோ" ,u"ரௌ", u"ல" ,u"லா" ,u"லி" ,u"லீ" ,u"லு" ,u"லூ" ,u"லெ" ,u"லே" ,u"லை" ,u"லொ" ,u"லோ" ,u"லௌ" , u"வ" ,u"வா" ,u"வி" ,u"வீ" ,u"வு" ,u"வூ" ,u"வெ" ,u"வே" ,u"வை" ,u"வொ" ,u"வோ" ,u"வௌ" , u"ழ" ,u"ழா" ,u"ழி" ,u"ழீ" ,u"ழு" ,u"ழூ" ,u"ழெ" ,u"ழே" ,u"ழை" ,u"ழொ" ,u"ழோ" ,u"ழௌ" , u"ள" ,u"ளா" ,u"ளி" ,u"ளீ" ,u"ளு" ,u"ளூ" ,u"ளெ" ,u"ளே" ,u"ளை" ,u"ளொ" ,u"ளோ" ,u"ளௌ" ] # Ref: # tamil digits : Apart from the numerals (0-9), Tamil also has numerals for 10, 100 and 1000. tamil_digit_1to10 = [u"௦", u"௧", u"௨",u"௩",u"௪",u"௫",u"௬",u"௭",u"௮",u"௯",u"௰"] tamil_digit_100 = u"௱" tamil_digit_1000 = u"௲" tamil_digits = [(num,digit) for num,digit in zip(range(0,11),tamil_digit_1to10)] tamil_digits.extend( [(100,tamil_digit_100),(1000,tamil_digit_1000)] ) # tamil symbols _day = u"௳" _month = u"௴" _year = u"௵" _debit = u"௶" _credit = u"௷" _rupee = u"௹" _numeral = u"௺" _sri = u"\u0bb6\u0bcd\u0bb0\u0bc0" #SRI - ஶ்ரீ _ksha = u"\u0b95\u0bcd\u0bb7" #KSHA - க்ஷ _ksh = u"\u0b95\u0bcd\u0bb7\u0bcd" #KSH - க்ஷ் tamil_symbols = [_day, _month, _year, _debit, _credit, _rupee, _numeral, _sri, _ksha, _ksh] ## total tamil letters in use, including sanskrit letters tamil_letters = [ ## /* Uyir */ u"அ",u"ஆ",u"இ", u"ஈ",u"உ",u"ஊ",u"எ",u"ஏ",u"ஐ",u"ஒ",u"ஓ",u"ஔ", ##/* Ayuda Ezhuthu */ u"ஃ", ## /* Mei */ u"க்",u"ச்",u"ட்",u"த்",u"ப்",u"ற்",u"ஞ்",u"ங்",u"ண்",u"ந்",u"ம்",u"ன்",u"ய்",u"ர்",u"ல்",u"வ்",u"ழ்",u"ள்", ## /* Agaram */ ## u"க",u"ச",u"ட",u"த",u"ப",u"ற",u"ஞ",u"ங",u"ண",u"ந",u"ம",u"ன",u"ய",u"ர",u"ல",u"வ",u"ழ",u"ள", ## /* Sanskrit (Vada Mozhi) */ ## u"ஜ",u"ஷ", u"ஸ",u"ஹ", ##/* Sanskrit (Mei) */ u"ஜ்",u"ஷ்", u"ஸ்",u"ஹ்", ## /* Uyir Mei */ u"க" ,u"கா" ,u"கி" ,u"கீ" ,u"கு" ,u"கூ" ,u"கெ" ,u"கே" ,u"கை" ,u"கொ" ,u"கோ" ,u"கௌ" ,u"ச" ,u"சா" ,u"சி" ,u"சீ" ,u"சு" ,u"சூ" ,u"செ" ,u"சே" ,u"சை" ,u"சொ" ,u"சோ" ,u"சௌ" ,u"ட" ,u"டா" ,u"டி" ,u"டீ" ,u"டு" ,u"டூ" ,u"டெ" ,u"டே" ,u"டை" ,u"டொ" ,u"டோ" ,u"டௌ" ,u"த" ,u"தா" ,u"தி" ,u"தீ" ,u"து" ,u"தூ" ,u"தெ" ,u"தே" ,u"தை" ,u"தொ" ,u"தோ" ,u"தௌ" ,u"ப" ,u"பா" ,u"பி" ,u"பீ" ,u"பு" ,u"பூ" ,u"பெ" ,u"பே" ,u"பை" ,u"பொ" ,u"போ" ,u"பௌ" ,u"ற" ,u"றா" ,u"றி" ,u"றீ" ,u"று" ,u"றூ" ,u"றெ" ,u"றே" ,u"றை" ,u"றொ" ,u"றோ" ,u"றௌ" ,u"ஞ" ,u"ஞா" ,u"ஞி" ,u"ஞீ" ,u"ஞு" ,u"ஞூ" ,u"ஞெ" ,u"ஞே" ,u"ஞை" ,u"ஞொ" ,u"ஞோ" ,u"ஞௌ" ,u"ங" ,u"ஙா" ,u"ஙி" ,u"ஙீ" ,u"ஙு" ,u"ஙூ" ,u"ஙெ" ,u"ஙே" ,u"ஙை" ,u"ஙொ" ,u"ஙோ" ,u"ஙௌ" ,u"ண" ,u"ணா" ,u"ணி" ,u"ணீ" ,u"ணு" ,u"ணூ" ,u"ணெ" ,u"ணே" ,u"ணை" ,u"ணொ" ,u"ணோ" ,u"ணௌ" ,u"ந" ,u"நா" ,u"நி" ,u"நீ" ,u"நு" ,u"நூ" ,u"நெ" ,u"நே" ,u"நை" ,u"நொ" ,u"நோ" ,u"நௌ" ,u"ம" ,u"மா" ,u"மி" ,u"மீ" ,u"மு" ,u"மூ" ,u"மெ" ,u"மே" ,u"மை" ,u"மொ" ,u"மோ" ,u"மௌ" ,u"ன" ,u"னா" ,u"னி" ,u"னீ" ,u"னு" ,u"னூ" ,u"னெ" ,u"னே" ,u"னை" ,u"னொ" ,u"னோ" ,u"னௌ" ,u"ய" ,u"யா" ,u"யி" ,u"யீ" ,u"யு" ,u"யூ" ,u"யெ" ,u"யே" ,u"யை" ,u"யொ" ,u"யோ" ,u"யௌ" ,u"ர" ,u"ரா" ,u"ரி" ,u"ரீ" ,u"ரு" ,u"ரூ" ,u"ரெ" ,u"ரே" ,u"ரை" ,u"ரொ" ,u"ரோ" ,u"ரௌ" ,u"ல" ,u"லா" ,u"லி" ,u"லீ" ,u"லு" ,u"லூ" ,u"லெ" ,u"லே" ,u"லை" ,u"லொ" ,u"லோ" ,u"லௌ" ,u"வ" ,u"வா" ,u"வி" ,u"வீ" ,u"வு" ,u"வூ" ,u"வெ" ,u"வே" ,u"வை" ,u"வொ" ,u"வோ" ,u"வௌ" ,u"ழ" ,u"ழா" ,u"ழி" ,u"ழீ" ,u"ழு" ,u"ழூ" ,u"ழெ" ,u"ழே" ,u"ழை" ,u"ழொ" ,u"ழோ" ,u"ழௌ" ,u"ள" ,u"ளா" ,u"ளி" ,u"ளீ" ,u"ளு" ,u"ளூ" ,u"ளெ" ,u"ளே" ,u"ளை" ,u"ளொ" ,u"ளோ" ,u"ளௌ" ##/* Sanskrit Uyir-Mei */ ,u"ஶ", u"ஶா", u"ஶி", u"ஶீ", u"ஶு", u"ஶூ", u"ஶெ", u"ஶே", u"ஶை", u"ஶொ", u"ஶோ", u"ஶௌ" ,u"ஜ" ,u"ஜா" ,u"ஜி" ,u"ஜீ" ,u"ஜு" ,u"ஜூ" ,u"ஜெ" ,u"ஜே" ,u"ஜை" ,u"ஜொ" ,u"ஜோ" ,u"ஜௌ" ,u"ஷ" ,u"ஷா" ,u"ஷி" ,u"ஷீ" ,u"ஷு" ,u"ஷூ" ,u"ஷெ" ,u"ஷே" ,u"ஷை" ,u"ஷொ" ,u"ஷோ" ,u"ஷௌ" ,u"ஸ" ,u"ஸா" ,u"ஸி" ,u"ஸீ" ,u"ஸு" ,u"ஸூ" ,u"ஸெ" ,u"ஸே" ,u"ஸை" ,u"ஸொ" ,u"ஸோ" ,u"ஸௌ" ,u"ஹ" ,u"ஹா" ,u"ஹி" ,u"ஹீ" ,u"ஹு" ,u"ஹூ" ,u"ஹெ" ,u"ஹே" ,u"ஹை" ,u"ஹொ" ,u"ஹோ" ,u"ஹௌ" ,u"க்ஷ" ,u"க்ஷா" ,u"க்ஷி" ,u"க்ஷீ" ,u"க்ஷு" ,u"க்ஷூ" ,u"க்ஷெ" ,u"க்ஷே" ,u"க்ஷை" ,u"க்ஷொ" ,u"க்ஷோ" ,u"க்ஷௌ" ] grantha_uyirmei_letters = copy( tamil_letters[tamil_letters.index(u"கா")-1:] ) ## length of the definitions
[docs]def accent_len( ): return TA_ACCENT_LEN ## 13 = 12 + 1
[docs]def ayudha_len( ): return TA_AYUDHA_LEN ## 1
[docs]def uyir_len( ): return TA_UYIR_LEN ##12
[docs]def mei_len( ): return TA_MEI_LEN ##18
[docs]def agaram_len( ): return TA_AGARAM_LEN ##18
[docs]def uyirmei_len( ): return TA_UYIRMEI_LEN ##216
[docs]def tamil_len( ): return len(tamil_letters)
## access the letters
[docs]def uyir( idx ): assert ( idx >= 0 and idx < uyir_len() ) return uyir_letters[idx]
[docs]def agaram( idx ): assert ( idx >= 0 and idx < agaram_len() ) return agaram_letters[idx]
[docs]def mei( idx ): assert ( idx >= 0 and idx < mei_len() ) return mei_letters[idx]
[docs]def uyirmei( idx ): assert( idx >= 0 and idx < uyirmei_len() ) return uyirmei_letters[idx]
[docs]def mei_to_agaram(in_syllable): if in_syllable in grantha_mei_letters: mei_pos = grantha_mei_letters.index(in_syllable) agaram_a_pos = 0 syllable = uyirmei_constructed(mei_pos,agaram_a_pos) return syllable return in_syllable
[docs]def uyirmei_constructed( mei_idx, uyir_idx): """ construct uyirmei letter give mei index and uyir index """ idx,idy = mei_idx,uyir_idx assert ( idy >= 0 and idy < uyir_len() ) assert ( idx >= 0 and idx < 6+mei_len() ) return grantha_agaram_letters[mei_idx]+accent_symbols[uyir_idx]
[docs]def tamil( idx ): """ retrieve Tamil letter at canonical index from array utf8.tamil_letters """ assert ( idx >= 0 and idx < tamil_len() ) return tamil_letters[idx]
# companion function to @tamil()
[docs]def getidx(letter): for itr in range(0,tamil_len()): if tamil_letters[itr] == letter: return itr raise Exception("Cannot find letter in Tamil arichuvadi")
## useful part of the API:
[docs]def istamil_prefix( word ): """ check if the given word has a tamil prefix. Returns either a True/False flag """ for letter in tamil_letters: if ( word.find(letter) == 0 ): return True return False
if not PYTHON3: is_tamil_unicode_predicate = lambda x: x >= unichr(2946) and x <= unichr(3066) else: is_tamil_unicode_predicate = lambda x: x >= chr(2946) and x <= chr(3066)
[docs]def is_tamil_unicode( sequence ): # Ref: languagetool-office-extension/src/main/java/org/languagetool/openoffice/ if type(sequence) is list: return list(map( is_tamil_unicode_predicate, sequence )) if len(sequence) > 1: return list(map( is_tamil_unicode_predicate, get_letters(sequence) )) return is_tamil_unicode_predicate( sequence )
[docs]def all_tamil( word_in ): """ predicate checks if all letters of the input word are Tamil letters """ if isinstance(word_in,list): word = word_in else: word = get_letters( word_in ) return all( [(letter in tamil_letters) for letter in word] )
[docs]def has_tamil( word ): """check if the word has any occurance of any tamil letter """ # list comprehension is not necessary - we bail at earliest for letters in tamil_letters: if ( word.find(letters) >= 0 ): return True return False
[docs]def istamil( tchar ): """ check if the letter tchar is prefix of any of tamil-letter. It suggests we have a tamil identifier""" if (tchar in tamil_letters): return True return False
[docs]def istamil_alnum( tchar ): """ check if the character is alphanumeric, or tamil. This saves time from running through istamil() check. """ return ( tchar.isalnum( ) or istamil( tchar ) )
[docs]def reverse_word( word ): """ reverse a Tamil word according to letters not unicode-points """ op = get_letters( word ) op.reverse() return u"".join(op)
## find out if the letters like, "பொ" are written in canonical "ப + ொ"" graphemes then ## return True. If they are written like "ப + ெ + ா" then return False on first occurrence
[docs]def is_normalized( text ): #print(text[0],text[1],text[2],text[-1],text[-2]) TLEN,idx = len(text),1 kaal = u"ா" Laa = u"ள" sinna_kombu, periya_kombu = u"ெ", u"ே" kombugal = [sinna_kombu, periya_kombu] # predicate measures if the normalization is violated def predicate( last_letter, prev_letter): if ((kaal == last_letter) and (prev_letter in kombugal)): return True if ((Laa == last_letter) and (prev_letter == sinna_kombu)): return True return False if TLEN < 2: return True elif TLEN == 2: if predicate( text[-1], text[-2] ): return False return True idx = TLEN a = text[idx-2] b = text[idx-1] while (idx >= 0): if predicate(b,a): return False b=a idx = idx - 1 if idx >= 0: a=text[idx] return True
def _make_set(args): if PYTHON3: return frozenset(args) return set(args) grantha_agaram_set = _make_set(grantha_agaram_letters) accent_symbol_set = _make_set(accent_symbols) uyir_letter_set = _make_set(uyir_letters) ## Split a tamil-unicode stream into ## tamil characters (individuals).
[docs]def get_letters( word ): """ splits the word into a character-list of tamil/english characters present in the stream """ ta_letters = list() not_empty = False WLEN,idx = len(word),0 while (idx < WLEN): c = word[idx] #print(idx,hex(ord(c)),len(ta_letters)) if c in uyir_letter_set or c == ayudha_letter: ta_letters.append(c) not_empty = True elif c in grantha_agaram_set: ta_letters.append(c) not_empty = True elif c in accent_symbol_set: if not not_empty: # odd situation ta_letters.append(c) not_empty = True else: #print("Merge/accent") ta_letters[-1] += c else: if ord(c) < 256 or not (is_tamil_unicode(c)): ta_letters.append( c ) else: if not_empty: #print("Merge/??") ta_letters[-1]+= c else: ta_letters.append(c) not_empty = True idx = idx + 1 return ta_letters
_all_symbols = copy( accent_symbols ) _all_symbols.extend( pulli_symbols ) all_symbol_set = _make_set(_all_symbols) # same as get_letters but use as iterable
[docs]def get_letters_iterable( word ): """ splits the word into a character-list of tamil/english characters present in the stream """ WLEN,idx = len(word),0 while (idx < WLEN): c = word[idx] #print(idx,hex(ord(c)),len(ta_letters)) if c in uyir_letter_set or c == ayudha_letter: idx = idx + 1 yield c elif c in grantha_agaram_set: if idx + 1 < WLEN and word[idx+1] in all_symbol_set: c2 = word[idx+1] idx = idx + 2 yield (c + c2) else: idx = idx + 1 yield c else: idx = idx + 1 yield c return
grantha_uyirmei_splits = {} for _uyir_idx in range(0,12): for _mei_idx, _mei in enumerate(grantha_mei_letters): _uyirmei = uyirmei_constructed( _mei_idx, _uyir_idx ) grantha_uyirmei_splits[_uyirmei] = [_mei,uyir_letters[_uyir_idx]]
[docs]def get_letters_elementary_iterable(word): for letter in get_letters_iterable(word): letter_parts = grantha_uyirmei_splits.get(letter,None) if letter_parts: yield letter_parts[0] yield letter_parts[1] else: yield letter return
[docs]def get_letters_elementary(word): rval = [] for letter in get_letters(word): letter_parts = grantha_uyirmei_splits.get(letter,None) if letter_parts: rval.append( letter_parts[0] ) rval.append( letter_parts[1] ) else: rval.append( letter ) return rval
[docs]def get_words(letters,tamil_only=False): return [ word for word in get_words_iterable(letters,tamil_only) ]
[docs]def get_words_iterable( letters, tamil_only=False ): """ given a list of UTF-8 letters section them into words, grouping them at spaces """ # correct algorithm for get-tamil-words buf = [] for idx,let in enumerate(letters): if not let.isspace(): if istamil(let) or (not tamil_only): buf.append( let ) else: if len(buf) > 0: yield u"".join( buf ) buf = [] if len(buf) > 0: yield u"".join(buf)
[docs]def get_tamil_words( letters ): """ reverse a Tamil word according to letters, not unicode-points """ if not isinstance(letters,list): raise Exception("metehod needs to be used with list generated from 'tamil.utf8.get_letters(...)'") return [word for word in get_words_iterable( letters, tamil_only = True )]
if PYTHON3: def cmp( x, y): if x == y: return 0 if x > y: return 1 return -1 # answer if word_a ranks ahead of, or at same level, as word_b in a Tamil dictionary order... # for use with Python : if a > 0
[docs]def compare_words_lexicographic( word_a, word_b ): """ compare words in Tamil lexicographic order """ # sanity check for words to be all Tamil if ( not all_tamil(word_a) ) or (not all_tamil(word_b)) : #print("## ") #print(word_a) #print(word_b) #print("Both operands need to be Tamil words") pass La = len(word_a) Lb = len(word_b) all_TA_letters = u"".join(tamil_letters) for itr in range(0,min(La,Lb)): pos1 = all_TA_letters.find( word_a[itr] ) pos2 = all_TA_letters.find( word_b[itr] ) if pos1 != pos2 : #print not( pos1 > pos2), pos1, pos2 return cmp(pos1, pos2) # result depends on if La is shorter than Lb, or 0 if La == Lb i.e. cmp return cmp(La,Lb)
# return a list of ordered-pairs containing positions # that are common in word_a, and word_b; e.g. # தேடுக x தடங்கல் -> one common letter க [(2,3)] # சொல் x தேடுக -> no common letters []
[docs]def word_intersection( word_a, word_b ): """ return a list of tuples where word_a, word_b intersect """ positions = [] word_a_letters = get_letters( word_a ) word_b_letters = get_letters( word_b ) for idx,wa in enumerate(word_a_letters): for idy,wb in enumerate(word_b_letters): if ( wa == wb ): positions.append( (idx, idy) ) return positions
[docs]def unicode_normalize(cplxchar): Laa = u"ள" kaal = u"ா" sinna_kombu_a = u"ெ" periya_kombu_aa = u"ே" sinna_kombu_o = u"ொ" periya_kombu_oo = u"ோ" kombu_ak = u"ௌ" lcplx = len(cplxchar) if lcplx>=3 and cplxchar[-1] == Laa: if cplxchar[-2] == sinna_kombu_a: return ( cplxchar[:-2] + kombu_ak ) if lcplx >= 2 and cplxchar[-1] == kaal: if cplxchar[-2] == sinna_kombu_a: return ( cplxchar[:-2]+sinna_kombu_o ) if cplxchar[-2] == periya_kombu_aa: return ( cplxchar[:-2]+periya_kombu_oo ) # no-op return cplxchar
[docs]def splitMeiUyir(uyirmei_char): """ This function split uyirmei compound character into mei + uyir characters and returns in tuple. Input : It must be unicode tamil char. Written By : Arulalan.T Date : 22.09.2014 """ if not isinstance(uyirmei_char, PYTHON3 and str or unicode): raise ValueError("Passed input letter '%s' must be unicode, \ not just string" % uyirmei_char) if uyirmei_char in mei_letters or uyirmei_char in uyir_letters or uyirmei_char in ayudha_letter: return uyirmei_char if uyirmei_char not in grantha_uyirmei_letters: if not is_normalized( uyirmei_char ): norm_char = unicode_normalize(uyirmei_char) rval = splitMeiUyir( norm_char ) return rval raise ValueError("Passed input letter '%s' is not tamil letter" % uyirmei_char) idx = grantha_uyirmei_letters.index(uyirmei_char) uyiridx = idx % 12 meiidx = int((idx - uyiridx)/ 12) return (grantha_mei_letters[meiidx], uyir_letters[uyiridx])
# end of def splitMeiUyir(uyirmei_char):
[docs]def joinMeiUyir(mei_char, uyir_char): """ This function join mei character and uyir character, and retuns as compound uyirmei unicode character. Inputs: mei_char : It must be unicode tamil mei char. uyir_char : It must be unicode tamil uyir char. Written By : Arulalan.T Date : 22.09.2014 """ if not isinstance(mei_char, PYTHON3 and str or unicode): raise ValueError("Passed input mei character '%s' must be unicode, \ not just string" % mei_char) if not isinstance(uyir_char, PYTHON3 and str or unicode): raise ValueError("Passed input uyir character '%s' must be unicode, \ not just string" % uyir_char) if mei_char not in grantha_mei_letters: raise ValueError("Passed input character '%s' is not a" "tamil mei character" % mei_char) if uyir_char not in uyir_letters: raise ValueError("Passed input character '%s' is not a" "tamil uyir character" % uyir_char) uyiridx = uyir_letters.index(uyir_char) meiidx = grantha_mei_letters.index(mei_char) # calculate uyirmei index uyirmeiidx = meiidx*12 + uyiridx return grantha_uyirmei_letters[uyirmeiidx]
[docs]def classify_letter(letter): if not isinstance(letter, PYTHON3 and str or unicode): raise TypeError("Input'%s' must be unicode, not just string" % letter) kinds = [u'kuril',u'nedil',u'ayudham',u'vallinam',u'mellinam',u'idayinam',u'uyirmei',u'tamil_or_grantham'] if letter in uyir_letters: if letter in kuril_letters: return u'kuril' elif letter in nedil_letters: return u'nedil' elif letter == ayudha_letter: return 'ayudham' if letter in mei_letters: if letter in mellinam_letters: return 'mellinam' elif letter in vallinam_letters: return 'vallinam' elif letter in idayinam_letters: return 'idayinam' if letter in uyirmei_letters: return 'uyirmei' if letter in tamil_letters: return 'tamil_or_grantham' if letter.isalpha(): return 'english' elif letter.isdigit(): return 'digit' raise ValueError("Unknown letter '%s' neither Tamil nor English or number"%letter)
[docs]def tamil_sorted(list_data): if PYTHON3: asorted = sorted(list_data,key=functools.cmp_to_key(compare_words_lexicographic)) else: asorted = sorted(list_data,cmp=compare_words_lexicographic) return asorted
# Tamil Letters # அ ஆ இ ஈ உ ஊ எ ஏ ஐ ஒ ஓ ஔ ஃ # க் ச் ட் த் ப் ற் ஞ் ங் ண் ந் ம் ன் ய் ர் ல் வ் ழ் ள் ஜ் ஷ் ஸ் ஹ் # க ச ட த ப ற ஞ ங ண ந ம ன ய ர ல வ ழ ள ஜ ஷ ஸ ஹ # க கா கி கீ கு கூ கெ கே கை கௌ # ச சா சி சீ சு சூ செ சே சை சொ சோ சௌ # ட டா டி டீ டு டூ டெ டே டை டொ டோ டௌ # த தா தி தீ து தூ தெ தே தை தொ தோ தௌ # ப பா பி பீ பு பூ பெ பே பை பொ போ பௌ # ற றா றி றீ று றூ றெ றே றை றொ றோ றௌ # ஞ ஞா ஞி ஞீ ஞு ஞூ ஞெ ஞே ஞை ஞொ ஞோ ஞௌ # ங ஙா ஙி ஙீ ஙு ஙூ ஙெ ஙே ஙை ஙொ ஙோ ஙௌ # ண ணா ணி ணீ ணு ணூ ணெ ணே ணை ணொ ணோ ணௌ # ந நா நி நீ நு நூ நெ நே நை நொ நோ நௌ # ம மா மி மீ மு மூ மெ மே மை மொ மோ மௌ # ன னா னி னீ னு னூ னெ னே னை னொ னோ னௌ # ய யா யி யீ யு யூ யெ யே யை யொ யோ யௌ # ர ரா ரி ரீ ரு ரூ ரெ ரே ரை ரொ ரோ ரௌ # ல லா லி லீ லு லூ லெ லே லை லொ லோ லௌ # வ வா வி வீ வு வூ வெ வே வை வொ வோ வௌ # ழ ழா ழி ழீ ழு ழூ ழெ ழே ழை ழொ ழோ ழௌ # ள ளா ளி ளீ ளு ளூ ளெ ளே ளை ளொ ளோ ளௌ # ஶ ஶா ஶி ஶீ ஶு ஶூ ஶெ ஶே ஶை ஶொ ஶோ ஶௌ # ஜ ஜா ஜி ஜீ ஜு ஜூ ஜெ ஜே ஜை ஜொ ஜோ ஜௌ # ஷ ஷா ஷி ஷீ ஷு ஷூ ஷெ ஷே ஷை ஷொ ஷோ ஷௌ # ஸ ஸா ஸி ஸீ ஸு ஸூ ஸெ ஸே ஸை ஸொ ஸோ ஸௌ # ஹ ஹா ஹி ஹீ ஹு ஹூ ஹெ ஹே ஹை ஹொ ஹோ ஹௌ # க்ஷ க்ஷா க்ஷி க்ஷீ க்ஷு க்ஷூ க்ஷெ க்ஷே க்ஷை க்ஷொ க்ஷோ க்ஷௌ