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annotate babel/messages/checkers.py @ 353:0791b3bf42cc trunk

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Fixed a small bug in the python format string checker that caused the wrong exception to be thrown.
author aronacher
date Tue, 17 Jun 2008 19:59:02 +0000
parents 8860097a9765
children 9a2618ab9bbc
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 -*-
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2 #
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3 # Copyright (C) 2007 Edgewall Software
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4 # All rights reserved.
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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.
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://babel.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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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.
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12 # history and logs, available at http://babel.edgewall.org/log/.
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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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21
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22 #: list of format chars that are compatible to each other
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23 _string_format_compatibilities = [
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24 set(['i', 'd', 'u']),
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25 set(['x', 'X']),
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26 set(['f', 'F', 'g', 'G'])
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27 ]
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30 def num_plurals(catalog, message):
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31 """Verify the number of plurals in the translation."""
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32 if not message.pluralizable:
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33 if not isinstance(message.string, basestring):
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34 raise TranslationError("Found plural forms for non-pluralizable "
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35 "message")
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36 return
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37
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38 msgstrs = message.string
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39 if not isinstance(msgstrs, (list, tuple)):
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40 msgstrs = (msgstrs,)
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41 if len(msgstrs) != catalog.num_plurals:
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42 raise TranslationError("Wrong number of plural forms (expected %d)" %
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43 catalog.num_plurals)
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44
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45
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46 def python_format(catalog, message):
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0791b3bf42cc Fixed a small bug in the python format string checker that caused the wrong exception to be thrown.
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47 """Verify the format string placeholders in the translation."""
352
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48 if 'python-format' not in message.flags:
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49 return
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50 msgids = message.id
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51 if not isinstance(msgids, (list, tuple)):
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52 msgids = (msgids,)
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53 msgstrs = message.string
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54 if not isinstance(msgstrs, (list, tuple)):
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55 msgstrs = (msgstrs,)
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56
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57 for msgid, msgstr in izip(msgids, msgstrs):
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58 if msgstr:
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59 _validate_format(msgid, msgstr)
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60
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61
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62 def _validate_format(format, alternative):
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63 """Test format string `alternative` against `format`. `format` can be the
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64 msgid of a message and `alternative` one of the `msgstr`\s. The two
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65 arguments are not interchangeable as `alternative` may contain less
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66 placeholders if `format` uses named placeholders.
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67
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68 If `format` does not use string formatting a `ValueError` is raised.
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69
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70 If the string formatting of `alternative` is compatible to `format` the
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71 function returns `None`, otherwise a `TranslationError` is raised.
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72
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73 Examples for compatible format strings:
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74
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75 >>> _validate_format('Hello %s!', 'Hallo %s!')
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76 >>> _validate_format('Hello %i!', 'Hallo %d!')
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77
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78 Example for an incompatible format strings:
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79
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80 >>> _validate_format('Hello %(name)s!', 'Hallo %s!')
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81 Traceback (most recent call last):
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82 ...
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83 TranslationError: the format strings are of different kinds
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84
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85 This function is used by the `python_format` checker.
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86
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87 :param format: The original format string
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88 :param alternative: The alternative format string that should be checked
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89 against format
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90 :return: None on success
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91 :raises TranslationError: on formatting errors
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92 """
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93
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94 def _parse(string):
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95 result = []
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96 for match in PYTHON_FORMAT.finditer(string):
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97 name, format, typechar = match.groups()
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98 if typechar == '%' and name is not None:
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99 continue
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100 result.append((name, typechar))
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101 return result
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102
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103 def _compatible(a, b):
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104 if a == b:
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105 return True
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106 for set in _string_format_compatibilities:
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107 if a in set and b in set:
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108 return True
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109 return False
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110
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111 def _check_positional(results):
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112 positional = None
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113 for name, char in results:
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114 if positional is None:
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115 positional = name is None
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116 else:
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117 if (name is None) != positional:
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118 raise TranslationError('format string mixes positional '
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119 'and named placeholders')
352
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120 return bool(positional)
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121
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122 a, b = map(_parse, (format, alternative))
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123
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124 # if a does not use string formattings, we are dealing with invalid
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125 # input data. This function only works if the first string provided
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126 # does contain string format chars
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127 if not a:
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128 raise ValueError('original string provided does not use string '
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129 'formatting.')
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130
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131 # now check if both strings are positional or named
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132 a_positional, b_positional = map(_check_positional, (a, b))
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133 if a_positional and not b_positional and not b:
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134 raise TranslationError('placeholders are incompatible')
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135 elif a_positional != b_positional:
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136 raise TranslationError('the format strings are of different kinds')
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137
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138 # if we are operating on positional strings both must have the
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139 # same number of format chars and those must be compatible
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140 if a_positional:
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141 if len(a) != len(b):
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142 raise TranslationError('positional format placeholders are '
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143 'unbalanced')
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144 for idx, ((_, first), (_, second)) in enumerate(izip(a, b)):
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145 if not _compatible(first, second):
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146 raise TranslationError('incompatible format for placeholder '
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147 '%d: %r and %r are not compatible' %
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148 (idx + 1, first, second))
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149
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150 # otherwise the second string must not have names the first one
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151 # doesn't have and the types of those included must be compatible
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152 else:
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153 type_map = dict(a)
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154 for name, typechar in b:
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155 if name not in type_map:
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156 raise TranslationError('unknown named placeholder %r' % name)
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157 elif not _compatible(typechar, type_map[name]):
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158 raise TranslationErrorError('incompatible format for '
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159 'placeholder %r: '
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160 '%r and %r are not compatible' %
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161 (name, typechar, type_map[name]))
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162
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163
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164 #: list of builtin checkers for babel installations without setuptools.
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165 #: Keep this in sync with the mapping in the setup.py
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166 #: :see: babel.messages.catalog.Catalog.check
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167 builtin_checkers = [num_plurals, python_format]
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