escapeddict

+ 1 #============================================================================ + 2 #Name : escapeddict.py + 3 #Part of : Helium + 4 + 5 #Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). + 6 #All rights reserved. + 7 #This component and the accompanying materials are made available + 8 #under the terms of the License "Eclipse Public License v1.0" + 9 #which accompanies this distribution, and is available +10 #at the URL "http://www.eclipse.org/legal/epl-v10.html". +11 # +12 #Initial Contributors: +13 #Nokia Corporation - initial contribution. +14 # +15 #Contributors: +16 # +17 #Description: +18 #=============================================================================== +19 +20 """ This class enables developer to use ${xxx} pattern in their dict and +21 get them replaced recursively. +22 """ +23 import re +24 import types +25 import UserDict +26 +27 +

28 -class _CustomArray(list): +

29 """ Internal class +30 """ +

31 - def __str__(self): +

32 string = "" +33 for elem in self: +34 string += " "+elem +35 return string +

36 +37 +

38 -class EscapedDict(UserDict.UserDict): +

39 """ Implements a dictionary that escapes the key values recursively. """ +40 +

41 - def __init__(self, dict={}, failonerror=False): +

42 UserDict.UserDict.__init__(self, dict) +43 self.__failonerror = failonerror +

44 +

45 - def __getitem__(self, key): +

46 """ Overrides the usual __getitem__ to insert values of other keys referenced in this key's +47 value. """ +48 if key in self.data: +49 value = self.data[key] +50 result = value +51 if isinstance(value, types.ListType): +52 result = _CustomArray() +53 for elem in value: +54 (string, changes) = re.subn(r'\${(?P<name>[._a-zA-Z0-9]+)}', r'%(\g<name>)s', elem) +55 if changes > 0: +56 result.append(string % self) +57 else: +58 result.append(elem) +59 else: +60 (string, changes) = re.subn(r'\${(?P<name>[._a-zA-Z0-9]+)}', r'%(\g<name>)s', value) +61 if changes > 0: +62 result = string % self +63 return result +64 elif not self.__failonerror: +65 return "${%s}" % key +66 raise KeyError("Could not find key '%s'" % key) +

67 +68 +69 +

70 -def escapeString(input_string, config): +

71 """ Escape a string recursively. +72 +73 :param input_string: the string to be escaped. +74 :param config: a dictionnary containing the values to escape. +75 :return: the escaped string. +76 """ +77 data = EscapedDict(config) +78 match = re.search(r'\${(?P<name>[._a-zA-Z0-9]+)}', input_string) +79 if match != None: +80 for property_name in match.groups(): +81 property_value = data[property_name] +82 property_value = re.sub(r'\\', r'\\\\', property_value) +83 input_string = re.sub('\${' + property_name + '}', property_value, input_string) +84 return input_string +

85 +

Source Code for Module escapeddict