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import re |
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import unicodedata |
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from functools import reduce |
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from itertools import groupby |
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from string import punctuation |
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url_regex = re.compile(r"((www\.[^\s]+)|(https?://[^\s]+)|(http?://[^\s]+))") |
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control_char_regex = re.compile(r"[\r\n\t]+") |
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phone_number_regex = re.compile("\(?\+?\d[\s\d()-]{5,}\d") |
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finnish_social_id_regex = re.compile("\d{6}[-+Aa]\d{3}[a-zA-Z0-9]") |
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email_regex = re.compile(r"[\w.+-]+@[\w-]+\.[\w.-]+") |
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def clean_text(example) -> str: |
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data_preprocessing_funcs = [ |
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_replace_identity, |
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_replace_phone_number, |
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_replace_url, |
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_replace_email, |
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_fix_html, |
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_standardise_punc, |
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_remove_unicode_symbols, |
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_remove_control_char, |
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_remove_remaining_control_chars, |
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_remove_multiple_punctuation, |
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_remove_multi_space, |
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] |
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return reduce(lambda x, y: y(x["text"]), data_preprocessing_funcs, example) |
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def _standardise_punc(text: str) -> str: |
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transl_table = dict([(ord(x), ord(y)) for x, y in zip("‘’´“”–-", "'''\"\"--")]) |
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text_mod = text.translate(transl_table) |
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text_mod = re.sub(r"[^a-zA-Z0-9À-ÿ .,'%&€$=@+;<>/()!?%:-]", " ", text_mod) |
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return {"text": text_mod} |
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def _remove_control_char(text: str) -> str: |
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text_mod = re.sub(control_char_regex, " ", text) |
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return {"text": text_mod} |
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def _remove_remaining_control_chars(text: str) -> str: |
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text_mod = "".join(ch for ch in text if unicodedata.category(ch)[0] != "C") |
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return {"text": text_mod} |
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def _remove_multi_space(text: str) -> str: |
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text_mod = " ".join([txt for txt in text.split(" ") if txt and txt != ""]) |
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return {"text": text_mod} |
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def _remove_unicode_symbols(text: str) -> str: |
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text_mod = "".join(ch for ch in text if unicodedata.category(ch)[0:2] != "So") |
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return {"text": text_mod} |
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def _replace_url(text: str) -> str: |
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filler = "" |
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occ = text.count("www.") + text.count("http:") + text.count("https:") |
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text_mod = text |
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for _ in range(occ): |
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text_mod = re.sub(url_regex, filler, text_mod) |
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text_mod = " ".join(text_mod.split()) |
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return {"text": text_mod} |
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def _fix_html(text: str) -> str: |
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text_mod = ( |
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text.replace("#39;", "'") |
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.replace("amp;", "&") |
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.replace("#146;", "'") |
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.replace("nbsp;", " ") |
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.replace("\\n", "\n") |
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.replace("quot;", "'") |
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.replace("<br />", "\n") |
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.replace('\\"', '"') |
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.replace(" @.@ ", ".") |
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.replace(" @-@ ", "-") |
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.replace("...", " …") |
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) |
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return {"text": text_mod} |
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def _replace_phone_number(text: str) -> str: |
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text_mod = re.sub(phone_number_regex, " ", text) |
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return {"text": text_mod} |
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def _replace_identity(text: str) -> str: |
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text_mod = re.sub(finnish_social_id_regex, " ", text) |
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return {"text": text_mod} |
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def _replace_email(text: str) -> str: |
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text_mod = re.sub(email_regex, " ", text) |
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return {"text": text_mod} |
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def _remove_news_tags(text: str) -> str: |
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text_mod = re.sub(r"(<[A-Z].+?>)|(</[A-Z].+?>)", " ", text) |
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return {"text": text_mod} |
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def _remove_multiple_punctuation(text: str) -> str: |
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text_mod = re.sub(r"\b(\w+)( \1\b)+", r"\1", text) |
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punc = set(punctuation) |
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newtext = [] |
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for k, g in groupby(text_mod): |
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if k in punc: |
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newtext.append(k) |
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else: |
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newtext.extend(g) |
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text_mod = "".join(newtext) |
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return {"text": text_mod} |
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