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#
# Copyright (c) 2013-present, Anoop Kunchukuttan
# All rights reserved.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
#
#Program for text written in one Indic script to another based on Unicode mappings.
#
# @author Anoop Kunchukuttan
#
import sys, string, itertools, re, os
from collections import defaultdict
from indicnlp import common
from indicnlp import langinfo
from indicnlp.script import indic_scripts as isc
from indicnlp.transliterate.sinhala_transliterator import SinhalaDevanagariTransliterator as sdt
import pandas as pd
OFFSET_TO_ITRANS={}
ITRANS_TO_OFFSET=defaultdict(list)
DUPLICATE_ITRANS_REPRESENTATIONS={}
def init():
"""
To be called by library loader, do not call it in your program
"""
### Load the ITRANS-script offset map. The map was initially generated using the snippet below (uses the old itrans transliterator)
### The map is modified as needed to accomodate extensions and corrections to the mappings
#
# base=0x900
# l=[]
# for i in range(0,0x80):
# c=chr(base+i)
# itrans=ItransTransliterator.to_itrans(c,'hi')
# l.append((hex(i),c,itrans))
# print(l)
#
# pd.DataFrame(l,columns=['offset_hex','devnag_char','itrans']).to_csv('offset_itrans_map.csv',index=False,encoding='utf-8')
itrans_map_fname=os.path.join(common.get_resources_path(),'transliterate','offset_itrans_map.csv')
#itrans_map_fname=r'D:\src\python_sandbox\src\offset_itrans_map.csv'
itrans_df=pd.read_csv(itrans_map_fname,encoding='utf-8')
global OFFSET_TO_ITRANS, ITRANS_TO_OFFSET, DUPLICATE_ITRANS_REPRESENTATIONS
for r in itrans_df.iterrows():
itrans=r[1]['itrans']
o=int(r[1]['offset_hex'],base=16)
OFFSET_TO_ITRANS[o]=itrans
if langinfo.is_consonant_offset(o):
### for consonants, strip the schwa - add halant offset
ITRANS_TO_OFFSET[itrans[:-1]].extend([o,0x4d])
else:
### the append assumes that the maatra always comes after independent vowel in the df
ITRANS_TO_OFFSET[itrans].append(o)
DUPLICATE_ITRANS_REPRESENTATIONS = {
'A': 'aa',
'I': 'ii',
'U': 'uu',
'RRi': 'R^i',
'RRI': 'R^I',
'LLi': 'L^i',
'LLI': 'L^I',
'L': 'ld',
'w': 'v',
'x': 'kSh',
'gj': 'j~n',
'dny': 'j~n',
'.n': '.m',
'M': '.m',
'OM': 'AUM'
}
class UnicodeIndicTransliterator(object):
"""
Base class for rule-based transliteration among Indian languages.
Script pair specific transliterators should derive from this class and override the transliterate() method.
They can call the super class 'transliterate()' method to avail of the common transliteration
"""
@staticmethod
def _correct_tamil_mapping(offset):
# handle missing unaspirated and voiced plosives in Tamil script
# replace by unvoiced, unaspirated plosives
# for first 4 consonant rows of varnamala
# exception: ja has a mapping in Tamil
if offset>=0x15 and offset<=0x28 and \
offset!=0x1c and \
not ( (offset-0x15)%5==0 or (offset-0x15)%5==4 ) :
subst_char=(offset-0x15)//5
offset=0x15+5*subst_char
# for 5th consonant row of varnamala
if offset in [ 0x2b, 0x2c, 0x2d]:
offset=0x2a
# 'sh' becomes 'Sh'
if offset==0x36:
offset=0x37
return offset
@staticmethod
def transliterate(text,lang1_code,lang2_code):
"""
convert the source language script (lang1) to target language script (lang2)
text: text to transliterate
lang1_code: language 1 code
lang1_code: language 2 code
"""
if lang1_code in langinfo.SCRIPT_RANGES and lang2_code in langinfo.SCRIPT_RANGES:
# if Sinhala is source, do a mapping to Devanagari first
if lang1_code=='si':
text=sdt.sinhala_to_devanagari(text)
lang1_code='hi'
# if Sinhala is target, make Devanagiri the intermediate target
org_lang2_code=''
if lang2_code=='si':
lang2_code='hi'
org_lang2_code='si'
trans_lit_text=[]
for c in text:
newc=c
offset=ord(c)-langinfo.SCRIPT_RANGES[lang1_code][0]
if offset >=langinfo.COORDINATED_RANGE_START_INCLUSIVE and offset <= langinfo.COORDINATED_RANGE_END_INCLUSIVE and c!='\u0964' and c!='\u0965':
if lang2_code=='ta':
# tamil exceptions
offset=UnicodeIndicTransliterator._correct_tamil_mapping(offset)
newc=chr(langinfo.SCRIPT_RANGES[lang2_code][0]+offset)
trans_lit_text.append(newc)
# if Sinhala is source, do a mapping to Devanagari first
if org_lang2_code=='si':
return sdt.devanagari_to_sinhala(''.join(trans_lit_text))
return ''.join(trans_lit_text)
else:
return text
class ItransTransliterator(object):
"""
Transliterator between Indian scripts and ITRANS
"""
@staticmethod
def to_itrans(text,lang_code):
if lang_code in langinfo.SCRIPT_RANGES:
if lang_code=='ml':
# Change from chillus characters to corresponding consonant+halant
text=text.replace('\u0d7a','\u0d23\u0d4d')
text=text.replace('\u0d7b','\u0d28\u0d4d')
text=text.replace('\u0d7c','\u0d30\u0d4d')
text=text.replace('\u0d7d','\u0d32\u0d4d')
text=text.replace('\u0d7e','\u0d33\u0d4d')
text=text.replace('\u0d7f','\u0d15\u0d4d')
offsets = [ isc.get_offset(c,lang_code) for c in text ]
### naive lookup
# itrans_l = [ OFFSET_TO_ITRANS.get(o, '-' ) for o in offsets ]
itrans_l=[]
for o in offsets:
itrans=OFFSET_TO_ITRANS.get(o, chr(langinfo.SCRIPT_RANGES[lang_code][0]+o) )
if langinfo.is_halanta_offset(o):
itrans=''
if len(itrans_l)>0:
itrans_l.pop()
elif langinfo.is_vowel_sign_offset(o) and len(itrans_l)>0:
itrans_l.pop()
itrans_l.extend(itrans)
return ''.join(itrans_l)
else:
return text
@staticmethod
def from_itrans(text,lang):
"""
TODO: Document this method properly
TODO: A little hack is used to handle schwa: needs to be documented
TODO: check for robustness
"""
MAXCODE=4 ### TODO: Needs to be fixed
## handle_duplicate_itrans_representations
for k, v in DUPLICATE_ITRANS_REPRESENTATIONS.items():
if k in text:
text=text.replace(k,v)
start=0
match=None
solution=[]
i=start+1
while i<=len(text):
itrans=text[start:i]
# print('===')
# print('i: {}'.format(i))
# if i<len(text):
# print('c: {}'.format(text[i-1]))
# print('start: {}'.format(start))
# print('itrans: {}'.format(itrans))
if itrans in ITRANS_TO_OFFSET:
offs=ITRANS_TO_OFFSET[itrans]
## single element list - no problem
## except when it is 'a'
## 2 element list of 2 kinds:
### 1. alternate char for independent/dependent vowel
### 2. consonant + halant
if len(offs)==2 and \
langinfo.is_vowel_offset(offs[0]):
### 1. alternate char for independent/dependent vowel
## if previous is a consonant, then use the dependent vowel
if len(solution)>0 and langinfo.is_halanta(solution[-1],lang):
offs=[offs[1]] ## dependent vowel
else:
offs=[offs[0]] ## independent vowel
c=''.join([ langinfo.offset_to_char(x,lang) for x in offs ])
match=(i,c)
elif len(itrans)==1: ## unknown character
match=(i,itrans)
elif i<len(text) and (i-start)<MAXCODE+1: ## continue matching till MAXCODE length substring
i=i+1
continue
else:
solution.extend(match[1])
# start=i-1
start=match[0]
i=start
match=None
# print('match done')
# print('match: {}'.format(match))
i=i+1
### flush matches
if match is not None:
solution.extend(match[1])
#### post-processing
## delete unecessary halants
# print(''.join(solution))
temp_out=list(''.join(solution))
rem_indices=[]
for i in range(len(temp_out)-1):
if langinfo.is_halanta(temp_out[i],lang) and \
(langinfo.is_vowel_sign(temp_out[i+1],lang) \
or langinfo.is_nukta(temp_out[i+1],lang) \
or temp_out[i+1]==langinfo.offset_to_char(0x7f,lang)):
rem_indices.append(i)
# if temp_out[i]==langinfo.offset_to_char(0x7f,lang):
# rem_indices.append(i)
for i in reversed(rem_indices):
temp_out.pop(i)
out=''.join(temp_out)
## delete schwa placeholder
out=out.replace(langinfo.offset_to_char(0x7f,lang),'')
return out
if __name__ == '__main__':
if len(sys.argv)<4:
print("Usage: python unicode_transliterate.py <command> <infile> <outfile> <src_language> <tgt_language>")
sys.exit(1)
if sys.argv[1]=='transliterate':
src_language=sys.argv[4]
tgt_language=sys.argv[5]
with open(sys.argv[2],'r', encoding='utf-8') as ifile:
with open(sys.argv[3],'w', encoding='utf-8') as ofile:
for line in ifile.readlines():
transliterated_line=UnicodeIndicTransliterator.transliterate(line,src_language,tgt_language)
ofile.write(transliterated_line)
elif sys.argv[1]=='romanize':
language=sys.argv[4]
### temp fix to replace anusvara with corresponding nasal
#r1_nasal=re.compile(ur'\u0902([\u0915-\u0918])')
#r2_nasal=re.compile(ur'\u0902([\u091a-\u091d])')
#r3_nasal=re.compile(ur'\u0902([\u091f-\u0922])')
#r4_nasal=re.compile(ur'\u0902([\u0924-\u0927])')
#r5_nasal=re.compile(ur'\u0902([\u092a-\u092d])')
with open(sys.argv[2],'r', encoding='utf-8') as ifile:
with open(sys.argv[3],'w', encoding='utf-8') as ofile:
for line in ifile.readlines():
### temp fix to replace anusvara with corresponding nasal
#line=r1_nasal.sub(u'\u0919\u094D\\1',line)
#line=r2_nasal.sub(u'\u091e\u094D\\1',line)
#line=r3_nasal.sub(u'\u0923\u094D\\1',line)
#line=r4_nasal.sub(u'\u0928\u094D\\1',line)
#line=r5_nasal.sub(u'\u092e\u094D\\1',line)
transliterated_line=ItransTransliterator.to_itrans(line,language)
## temp fix to replace 'ph' to 'F' to match with Urdu transliteration scheme
transliterated_line=transliterated_line.replace('ph','f')
ofile.write(transliterated_line)
elif sys.argv[1]=='indicize':
language=sys.argv[4]
with open(sys.argv[2],'r', encoding='utf-8') as ifile:
with open(sys.argv[3],'w', encoding='utf-8') as ofile:
for line in ifile.readlines():
transliterated_line=ItransTransliterator.from_itrans(line,language)
ofile.write(transliterated_line)
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