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annotate babel/messages/checkers.py @ 416:3e2c8b5573a1 trunk

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Removed `ValueError` raising for string formatting message checkers if the string does not contain any string formattings. The new behavior is undefined. This fixes at least one of the problems of the #150 ticket.
author aronacher
date Fri, 31 Oct 2008 16:13:59 +0000
parents 05487ae7696e
children ac8961d40e61 2baa2cedd6f9
rev   line source
220
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
cmlenz
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1 # -*- coding: utf-8 -*-
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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2 #
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
cmlenz
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3 # Copyright (C) 2007 Edgewall Software
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4 # All rights reserved.
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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5 #
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6 # This software is licensed as described in the file COPYING, which
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
cmlenz
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7 # you should have received as part of this distribution. The terms
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
cmlenz
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8 # are also available at http://babel.edgewall.org/wiki/License.
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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9 #
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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10 # This software consists of voluntary contributions made by many
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
cmlenz
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11 # individuals. For the exact contribution history, see the revision
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
cmlenz
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12 # history and logs, available at http://babel.edgewall.org/log/.
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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13
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14 """Various routines that help with validation of translations.
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15
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16 :since: version 0.9
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17 """
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18
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19 from itertools import izip
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20 from babel.messages.catalog import TranslationError, PYTHON_FORMAT
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05487ae7696e fix Python 2.3 compat: rearrange set/itemgetter/rsplit/sorted/unicode.decode
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21 from babel.util import set
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22
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23 #: list of format chars that are compatible to each other
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24 _string_format_compatibilities = [
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25 set(['i', 'd', 'u']),
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26 set(['x', 'X']),
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27 set(['f', 'F', 'g', 'G'])
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28 ]
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31 def num_plurals(catalog, message):
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32 """Verify the number of plurals in the translation."""
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33 if not message.pluralizable:
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34 if not isinstance(message.string, basestring):
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35 raise TranslationError("Found plural forms for non-pluralizable "
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36 "message")
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37 return
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38
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39 # skip further tests if no catalog is provided.
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40 elif catalog is None:
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41 return
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42
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43 msgstrs = message.string
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44 if not isinstance(msgstrs, (list, tuple)):
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45 msgstrs = (msgstrs,)
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46 if len(msgstrs) != catalog.num_plurals:
97b4b289e792 Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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47 raise TranslationError("Wrong number of plural forms (expected %d)" %
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48 catalog.num_plurals)
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50
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51 def python_format(catalog, message):
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52 """Verify the format string placeholders in the translation."""
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53 if 'python-format' not in message.flags:
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54 return
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55 msgids = message.id
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56 if not isinstance(msgids, (list, tuple)):
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57 msgids = (msgids,)
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58 msgstrs = message.string
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59 if not isinstance(msgstrs, (list, tuple)):
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60 msgstrs = (msgstrs,)
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61
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62 for msgid, msgstr in izip(msgids, msgstrs):
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63 if msgstr:
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64 _validate_format(msgid, msgstr)
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65
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66
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67 def _validate_format(format, alternative):
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68 """Test format string `alternative` against `format`. `format` can be the
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69 msgid of a message and `alternative` one of the `msgstr`\s. The two
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70 arguments are not interchangeable as `alternative` may contain less
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71 placeholders if `format` uses named placeholders.
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72
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3e2c8b5573a1 Removed `ValueError` raising for string formatting message checkers if the string does not contain any string formattings. The new behavior is undefined. This fixes at least one of the problems of the #150 ticket.
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73 The behavior of this function is undefined if the string does not use
3e2c8b5573a1 Removed `ValueError` raising for string formatting message checkers if the string does not contain any string formattings. The new behavior is undefined. This fixes at least one of the problems of the #150 ticket.
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74 string formattings.
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75
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76 If the string formatting of `alternative` is compatible to `format` the
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77 function returns `None`, otherwise a `TranslationError` is raised.
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78
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79 Examples for compatible format strings:
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80
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81 >>> _validate_format('Hello %s!', 'Hallo %s!')
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82 >>> _validate_format('Hello %i!', 'Hallo %d!')
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83
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84 Example for an incompatible format strings:
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85
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86 >>> _validate_format('Hello %(name)s!', 'Hallo %s!')
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87 Traceback (most recent call last):
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88 ...
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89 TranslationError: the format strings are of different kinds
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90
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91 This function is used by the `python_format` checker.
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92
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93 :param format: The original format string
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94 :param alternative: The alternative format string that should be checked
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95 against format
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96 :return: None on success
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97 :raises TranslationError: on formatting errors
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98 """
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99
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100 def _parse(string):
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101 result = []
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102 for match in PYTHON_FORMAT.finditer(string):
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103 name, format, typechar = match.groups()
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8dd1234e8eab Fixed logic error in the python format checker.
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104 if typechar == '%' and name is None:
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105 continue
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106 result.append((name, str(typechar)))
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107 return result
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108
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109 def _compatible(a, b):
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110 if a == b:
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111 return True
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112 for set in _string_format_compatibilities:
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113 if a in set and b in set:
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114 return True
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115 return False
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116
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117 def _check_positional(results):
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118 positional = None
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119 for name, char in results:
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120 if positional is None:
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121 positional = name is None
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122 else:
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123 if (name is None) != positional:
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124 raise TranslationError('format string mixes positional '
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125 'and named placeholders')
352
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126 return bool(positional)
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127
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128 a, b = map(_parse, (format, alternative))
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129
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130 # now check if both strings are positional or named
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131 a_positional, b_positional = map(_check_positional, (a, b))
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132 if a_positional and not b_positional and not b:
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133 raise TranslationError('placeholders are incompatible')
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134 elif a_positional != b_positional:
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135 raise TranslationError('the format strings are of different kinds')
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136
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137 # if we are operating on positional strings both must have the
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138 # same number of format chars and those must be compatible
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139 if a_positional:
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140 if len(a) != len(b):
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141 raise TranslationError('positional format placeholders are '
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142 'unbalanced')
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143 for idx, ((_, first), (_, second)) in enumerate(izip(a, b)):
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144 if not _compatible(first, second):
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145 raise TranslationError('incompatible format for placeholder '
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146 '%d: %r and %r are not compatible' %
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147 (idx + 1, first, second))
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148
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149 # otherwise the second string must not have names the first one
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150 # doesn't have and the types of those included must be compatible
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151 else:
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152 type_map = dict(a)
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153 for name, typechar in b:
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154 if name not in type_map:
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155 raise TranslationError('unknown named placeholder %r' % name)
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156 elif not _compatible(typechar, type_map[name]):
364
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157 raise TranslationError('incompatible format for '
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158 'placeholder %r: '
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159 '%r and %r are not compatible' %
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160 (name, typechar, type_map[name]))
352
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161
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162
355
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163 def _find_checkers():
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164 try:
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165 from pkg_resources import working_set
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166 except ImportError:
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167 return [num_plurals, python_format]
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168 checkers = []
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169 for entry_point in working_set.iter_entry_points('babel.checkers'):
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170 checkers.append(entry_point.load())
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171 return checkers
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172
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173
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174 checkers = _find_checkers()
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