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annotate src/tools/common/regex.py @ 2109:85f3e12e984d

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core (memory/cache): file caching handling, first draft: instead of having file caching handled individually by plugins, a generic module has been added in memory. - Cache can be global or associated to a profile. In the later case, client.cache can be used. - Cache are managed with unique ids (which can be any unique unicode, hash uuid, or something else). - To know if a file is in cache, getFilePath is used: if the file is in cache, its absolute path is returned, else None is returned. - To cache a file, cacheData is used with at list the source of cache (most of time plugin import name), and unique id. The method return file opened in binary writing mode (so cacheData can - and should - be used with "with" statement). - 2 files will be created: a metadata file (named after the unique id), and the actual file. - each file has a end of life time, after it, the cache is invalidated and the file must be requested again.
author Goffi <goffi@goffi.org>
date Thu, 05 Jan 2017 20:23:38 +0100
parents 2daf7b4c6756
children ad2a8e8b52da
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1 #!/usr/bin/env python2
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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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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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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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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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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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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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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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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)