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annotate libervia/backend/tools/common/regex.py @ 4108:238e305f2306

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author Goffi <goffi@goffi.org>
date Thu, 06 Jul 2023 11:34:51 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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2
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3
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4 # Salut à Toi: an XMPP client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """ regex tools common to backend and frontends """
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21
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22 import re
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23 import unicodedata
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24
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25 path_escape = {"%": "%25", "/": "%2F", "\\": "%5c"}
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26 path_escape_rev = {re.escape(v): k for k, v in path_escape.items()}
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27 path_escape = {re.escape(k): v for k, v in path_escape.items()}
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28 #  thanks to Martijn Pieters (https://stackoverflow.com/a/14693789)
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29 RE_ANSI_REMOVE = re.compile(r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])')
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30 RE_TEXT_URL = re.compile(r'[^a-zA-Z0-9,_]+')
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31 TEXT_MAX_LEN = 60
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32 # min lenght is currently deactivated
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33 TEXT_WORD_MIN_LENGHT = 0
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35
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36 def re_join(exps):
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37 """Join (OR) various regexes"""
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38 return re.compile("|".join(exps))
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41 def re_sub_dict(pattern, repl_dict, string):
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42 """Replace key, value found in dict according to pattern
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43
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44 @param pattern(basestr): pattern using keys found in repl_dict
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45 @repl_dict(dict): keys found in this dict will be replaced by
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46 corresponding values
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47 @param string(basestr): string to use for the replacement
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48 """
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49 return pattern.sub(lambda m: repl_dict[re.escape(m.group(0))], string)
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51
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52 path_escape_re = re_join(list(path_escape.keys()))
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53 path_escape_rev_re = re_join(list(path_escape_rev.keys()))
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55
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56 def path_escape(string):
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57 """Escape string so it can be use in a file path
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58
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59 @param string(basestr): string to escape
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60 @return (str, unicode): escaped string, usable in a file path
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61 """
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62 return re_sub_dict(path_escape_re, path_escape, string)
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65 def path_unescape(string):
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66 """Unescape string from value found in file path
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68 @param string(basestr): string found in file path
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69 @return (str, unicode): unescaped string
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70 """
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71 return re_sub_dict(path_escape_rev_re, path_escape_rev, string)
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74 def ansi_remove(string):
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75 """Remove ANSI escape codes from string
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77 @param string(basestr): string to filter
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78 @return (str, unicode): string without ANSI escape codes
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79 """
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80 return RE_ANSI_REMOVE.sub("", string)
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82
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83 def url_friendly_text(text):
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84 """Convert text to url-friendly one"""
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85 # we change special chars to ascii one,
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86 # trick found at https://stackoverflow.com/a/3194567
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87 text = unicodedata.normalize('NFD', text).encode('ascii', 'ignore').decode('utf-8')
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88 text = RE_TEXT_URL.sub(' ', text).lower()
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89 text = '-'.join([t for t in text.split() if t and len(t)>=TEXT_WORD_MIN_LENGHT])
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90 while len(text) > TEXT_MAX_LEN:
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91 if '-' in text:
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92 text = text.rsplit('-', 1)[0]
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93 else:
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94 text = text[:TEXT_MAX_LEN]
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95 return text