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from parsivar import Normalizer
import num2fawords
import re
import string
_normalizer = Normalizer(half_space_char="\u200c", statistical_space_correction=True)
chars_to_ignore = [
",", "?", ".", "!", "-", ";", ":", '""', "%", "'", '"', "�",
"#", "!", "؟", "?", "«", "»", "،", "(", ")", "؛", "'ٔ", "٬", 'ٔ', ",", "?",
".", "!", "-", ";", ":", '"', "“", "%", "‘", "”", "�", "–", "…", "_", "”", '“', '„',
'ā', 'š', 'ّ', 'ْ',
]
chars_to_ignore = chars_to_ignore + list(string.ascii_lowercase + string.digits)
chars_to_ignore = f"""[{"".join(chars_to_ignore)}]"""
zwnj = "\u200c"
silent_chars = ["ا", "د", "ذ", "ر", "ز", "و", "آ"] + [zwnj] + [" "]
def multiple_replace(text, chars_to_mapping):
pattern = "|".join(map(re.escape, chars_to_mapping.keys()))
return re.sub(pattern, lambda m: chars_to_mapping[m.group()], str(text))
def remove_special_characters(text, chars_to_ignore_regex):
text = re.sub(chars_to_ignore_regex, '', text).lower() + " "
return text
def convert_word_nums_to_text(word):
try:
word = int(word)
word = num2fawords.words(word)
except:
word = word
return word
def normalizer_at_word_level(text):
words = text.split()
_text = []
for word in words:
word = convert_word_nums_to_text(word)
word = fixator_dictionary.get(word, word)
_text.append(word)
return " ".join(_text) + " "
def finder(ss, s, starter=False):
found = []
for m in re.finditer(ss, s):
if starter:
found.append(m.start())
else:
found.append((m.start(), m.end()))
return found
def substring_replace(ss, s, start, end, stripped=True):
s_start = s[:start]
s_end = s[end:]
counter = 0
if stripped:
counter = 1 if s_start.endswith(" ") else counter
s_start = s_start.rstrip()
return s_start + ss + s_end, counter
def normalizer(
batch,
is_normalize=True,
return_dict=True,
filter_trivials=False,
remove_extra_space=False
):
text = batch["sentence"].lower().strip()
# Parsivar normalizer
if is_normalize:
text = _normalizer.normalize(text)
# Dictionary mapping
text = multiple_replace(text, dictionary_mapping)
text = re.sub(" +", " ", text)
# Remove specials
text = remove_special_characters(text, chars_to_ignore)
text = re.sub(" +", " ", text)
# Replace connected آ
special, pointer = "آ", int("0")
for f in sorted(finder(special, text, True)):
index = f + pointer - 1
if len(text) >= index:
if text[index] not in silent_chars:
new_text, extra_pointer = substring_replace(
f"{text[index]}{zwnj}", text, index, index + 1, stripped=True)
text = new_text
pointer += 1 + 1 - 1 - extra_pointer
# Replace connected ها
pointer = int("0")
special_list = [
# "ام", "ای", "است", "ایم", "اید", "اند",
"هایمان", "هایم", "هایت", "هایش",
"هایتان", "هایشان", "هام", "هات",
"هاتان", "هامون", "هامان", "هاش",
"هاتون", "هاشان", "هاشون",
"هایی", "های", "هاس", "ها"
]
for special in special_list:
pointer = 0
text = text
for f in sorted(finder(special, text, False)):
start, end = f[0] + pointer - 1, f[1] + pointer - 1
if len(text) >= (end + 1):
if len(text) == (end + 1):
new_text, extra_pointer = substring_replace(
f"{zwnj}{special}",
text,
start + 1,
end + 1,
stripped=True)
text = new_text
pointer += 1 + 1 - 1 - extra_pointer
else:
if text[end + 1] == " ":
new_text, extra_pointer = substring_replace(
f"{zwnj}{special}",
text,
start + 1,
end + 1,
stripped=True)
text = new_text
pointer += 1 + 1 - 1 - extra_pointer
special, pointer = "افزار", int("0")
for f in sorted(finder(special, text, False)):
start, end = f[0] + pointer - 1, f[1] + pointer - 1
if len(text) >= (end + 1):
new_text, extra_pointer = substring_replace(f"{zwnj}{special}", text, start + 1, end + 1, stripped=True)
text = new_text
pointer += 1 + 1 - 1 - extra_pointer
# Replace connected ها
pointer = int("0")
special_list = [
"ترین", "تر"
]
for special in special_list:
pointer = 0
text = text
for f in sorted(finder(special, text, False)):
start, end = f[0] + pointer - 1, f[1] + pointer - 1
if len(text) >= (end + 1):
if len(text) == (end + 1):
new_text, extra_pointer = substring_replace(
f"{zwnj}{special}",
text,
start + 1,
end + 1,
stripped=True)
text = new_text
pointer += 1 + 1 - 1 - extra_pointer
else:
if text[end + 1] == " ":
new_text, extra_pointer = substring_replace(
f"{zwnj}{special}",
text,
start + 1,
end + 1,
stripped=True)
text = new_text
pointer += 1 + 1 - 1 - extra_pointer
# Normalizer at word level
text = normalizer_at_word_level(text)
text = re.sub(" +", " ", text)
if remove_extra_space:
text = text.strip()
else:
text = text.strip() + " "
if filter_trivials:
if not len(text) > 2:
text = None
if not return_dict:
return text
batch["sentence"] = text
return batch
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