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annotate src/tools/common/regex.py @ 1920:03526c8abeb0

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tools (common): added regex module with path (un)escaping methods
author Goffi <goffi@goffi.org>
date Tue, 22 Mar 2016 22:46:04 +0100
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children 2daf7b4c6756
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1920
03526c8abeb0 tools (common): added regex module with path (un)escaping methods
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1 #!/usr/bin/python
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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) 2009-2016 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 path_escape = {'%': '%25', '/': '%2F', '\\': '%5c'}
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24 path_escape_rev = {re.escape(v):k for k, v in path_escape.iteritems()}
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25 path_escape = {re.escape(k):v for k, v in path_escape.iteritems()}
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27
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28 def reJoin(exps):
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29 """Join (OR) various regexes"""
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30 return re.compile('|'.join(exps))
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31
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32
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33 def reSubDict(pattern, repl_dict, string):
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34 """Replace key, value found in dict according to pattern
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35
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36 @param pattern(basestr): pattern using keys found in repl_dict
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37 @repl_dict(dict): keys found in this dict will be replaced by
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38 corresponding values
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39 @param string(basestr): string to use for the replacement
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40 """
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41 return pattern.sub(lambda m: repl_dict[re.escape(m.group(0))], string)
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42
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43 path_escape_re = reJoin(path_escape.keys())
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44 path_escape_rev_re = reJoin(path_escape_rev.keys())
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47 def pathEscape(string):
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48 """Escape string so it can be use in a file path
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49
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50 @param string(basestr): string to escape
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51 @return (str, unicode): escaped string, usable in a file path
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52 """
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53 return reSubDict(path_escape_re, path_escape, string)
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54
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55
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56 def pathUnescape(string):
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57 """Unescape string from value found in file path
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58
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59 @param string(basestr): string found in file path
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60 @return (str, unicode): unescaped string
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61 """
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62 return reSubDict(path_escape_rev_re, path_escape_rev, string)