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annotate sat/tools/common/regex.py @ 3048:1761e4823527

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changelog: update
author Goffi <goffi@goffi.org>
date Tue, 01 Oct 2019 22:49:11 +0200
parents ab2696e34d29
children 9d0df638c8b4
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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 # Salut à Toi: an XMPP client
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6
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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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11
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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
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24 path_escape = {"%": "%25", "/": "%2F", "\\": "%5c"}
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25 path_escape_rev = {re.escape(v): k for k, v in path_escape.items()}
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26 path_escape = {re.escape(k): v for k, v in path_escape.items()}
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27 #  thanks to Martijn Pieters (https://stackoverflow.com/a/14693789)
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28 RE_ANSI_REMOVE = re.compile(r"\x1b[^m]*m")
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31 def reJoin(exps):
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32 """Join (OR) various regexes"""
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33 return re.compile("|".join(exps))
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36 def reSubDict(pattern, repl_dict, string):
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37 """Replace key, value found in dict according to pattern
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38
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39 @param pattern(basestr): pattern using keys found in repl_dict
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40 @repl_dict(dict): keys found in this dict will be replaced by
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41 corresponding values
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42 @param string(basestr): string to use for the replacement
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43 """
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44 return pattern.sub(lambda m: repl_dict[re.escape(m.group(0))], string)
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46
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47 path_escape_re = reJoin(list(path_escape.keys()))
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48 path_escape_rev_re = reJoin(list(path_escape_rev.keys()))
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51 def pathEscape(string):
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52 """Escape string so it can be use in a file path
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53
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54 @param string(basestr): string to escape
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55 @return (str, unicode): escaped string, usable in a file path
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56 """
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57 return reSubDict(path_escape_re, path_escape, string)
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60 def pathUnescape(string):
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61 """Unescape string from value found in file path
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63 @param string(basestr): string found in file path
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64 @return (str, unicode): unescaped string
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65 """
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66 return reSubDict(path_escape_rev_re, path_escape_rev, string)
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68
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69 def ansiRemove(string):
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70 """Remove ANSI escape codes from string
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72 @param string(basestr): string to filter
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73 @return (str, unicode): string without ANSI escape codes
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74 """
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75 return RE_ANSI_REMOVE.sub("", string)