udemy-downloader/sanitize.py

# This file is from https://github.com/r0oth3x49/udemy-dl/blob/master/udemy/sanitize.py

from __future__ import unicode_literals

import re
import six
import unicodedata
from unidecode import unidecode


def smart_text(s, encoding="utf-8", errors="strict"):
    if isinstance(s, six.text_type):
        return s

    if not isinstance(s, six.string_types):
        if six.PY3:
            if isinstance(s, bytes):
                s = six.text_type(s, encoding, errors)
            else:
                s = six.text_type(s)
        elif hasattr(s, "__unicode__"):
            s = six.text_type(s)
        else:
            s = six.text_type(bytes(s), encoding, errors)
    else:
        s = six.text_type(s)
    return s


# Extra characters outside of alphanumerics that we'll allow.
SLUG_OK = "-_~"


def slugify(s,
            ok=SLUG_OK,
            lower=True,
            spaces=False,
            only_ascii=False,
            space_replacement="_"):
    """
    Creates a unicode slug for given string with several options.
    L and N signify letter/number.
    http://www.unicode.org/reports/tr44/tr44-4.html#GC_Values_Table
    :param s: Your unicode string.
    :param ok: Extra characters outside of alphanumerics to be allowed.
               Default is '-_~'
    :param lower: Lower the output string. 
                  Default is True
    :param spaces: True allows spaces, False replaces a space with the "space_replacement" param
    :param only_ascii: True to replace non-ASCII unicode characters with 
                       their ASCII representations.
    :param space_replacement: Char used to replace spaces if "spaces" is False. 
                              Default is dash ("-") or first char in ok if dash not allowed
    :type s: String
    :type ok: String
    :type lower: Bool
    :type spaces: Bool
    :type only_ascii: Bool
    :type space_replacement: String
    :return: Slugified unicode string
    """

    if only_ascii and ok != SLUG_OK and hasattr(ok, "decode"):
        try:
            ok.decode("ascii")
        except UnicodeEncodeError:
            raise ValueError(
                ('You can not use "only_ascii=True" with '
                 'a non ascii available chars in "ok" ("%s" given)') % ok)

    rv = []
    for c in unicodedata.normalize("NFKC", smart_text(s)):
        cat = unicodedata.category(c)[0]
        if cat in "LN" or c in ok:
            rv.append(c)
        elif cat == "Z":  # space
            rv.append(" ")
    new = "".join(rv).strip()

    if only_ascii:
        new = unidecode(new)
    if not spaces:
        if space_replacement and space_replacement not in ok:
            space_replacement = ok[0] if ok else ""
        new = re.sub("[%s\s]+" % space_replacement, space_replacement, new)
    if lower:
        new = new.lower()

    return new


def sanitize(title):
    _locale = {
        "194": "A",
        "199": "C",
        "286": "G",
        "304": "I",
        "206": "I",
        "214": "O",
        "350": "S",
        "219": "U",
        "226": "a",
        "231": "c",
        "287": "g",
        "305": "i",
        "238": "i",
        "246": "o",
        "351": "s",
        "251": "u",
        "191": "",
        "225": "a",
        "233": "e",
        "237": "i",
        "243": "o",
        "250": "u",
        "252": "u",
        "168u": "u",
        "241": "n",
        "193": "A",
        "201": "E",
        "205": "I",
        "211": "O",
        "218": "U",
        "220": "U",
        "168U": "U",
        "209": "N",
        "223": "ss",
    }
    _temp = "".join([str(ord(i)) if ord(i) > 128 else i for i in title])
    for _ascii, _char in _locale.items():
        if _ascii in _temp:
            _temp = _temp.replace(_ascii, _char)

    ok = re.compile(r'[^\\/:*?"<>]')
    _title = "".join(x if ok.match(x) else "_" for x in _temp)
    return _title