Mercurial > babel > mirror
annotate babel/messages/checkers.py @ 352:8860097a9765 trunk
The builtin checkers don't require setuptools any longer, validate_format and python_format from the checkers module are merged into one now.
author | aronacher |
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date | Tue, 17 Jun 2008 19:54:34 +0000 |
parents | 38053412171b |
children | 0791b3bf42cc |
rev | line source |
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Added infrastructure for adding catalog checkers, and implement a checker that validations Python format parameters in translations, closing #19.
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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 |
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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 |
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12 # history and logs, available at http://babel.edgewall.org/log/. |
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13 |
234 | 14 """Various routines that help with validation of translations. |
15 | |
16 :since: version 0.9 | |
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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28 |
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29 |
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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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47 if 'python-format' not in message.flags: |
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48 return |
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49 msgids = message.id |
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50 if not isinstance(msgids, (list, tuple)): |
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51 msgids = (msgids,) |
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52 msgstrs = message.string |
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53 if not isinstance(msgstrs, (list, tuple)): |
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54 msgstrs = (msgstrs,) |
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55 |
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56 for msgid, msgstr in izip(msgids, msgstrs): |
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57 if msgstr: |
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58 _validate_format(msgid, msgstr) |
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59 |
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60 |
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61 def _validate_format(format, alternative): |
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62 """Test format string `alternative` against `format`. `format` can be the |
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63 msgid of a message and `alternative` one of the `msgstr`\s. The two |
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64 arguments are not interchangeable as `alternative` may contain less |
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65 placeholders if `format` uses named placeholders. |
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66 |
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67 If `format` does not use string formatting a `ValueError` is raised. |
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68 |
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69 If the string formatting of `alternative` is compatible to `format` the |
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70 function returns `None`, otherwise a `TranslationError` is raised. |
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71 |
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72 Examples for compatible format strings: |
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73 |
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74 >>> _validate_format('Hello %s!', 'Hallo %s!') |
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75 >>> _validate_format('Hello %i!', 'Hallo %d!') |
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76 |
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77 Example for an incompatible format strings: |
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78 |
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79 >>> _validate_format('Hello %(name)s!', 'Hallo %s!') |
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80 Traceback (most recent call last): |
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81 ... |
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82 TranslationError: the format strings are of different kinds |
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83 |
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84 This function is used by the `python_format` checker. |
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85 |
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86 :param format: The original format string |
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87 :param alternative: The alternative format string that should be checked |
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88 against format |
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89 :return: None on success |
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90 :raises TranslationError: on formatting errors |
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91 """ |
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92 |
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93 def _parse(string): |
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94 result = [] |
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95 for match in PYTHON_FORMAT.finditer(string): |
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96 name, format, typechar = match.groups() |
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97 if typechar == '%' and name is not None: |
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98 continue |
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99 result.append((name, typechar)) |
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100 return result |
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101 |
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102 def _compatible(a, b): |
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103 if a == b: |
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104 return True |
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105 for set in _string_format_compatibilities: |
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106 if a in set and b in set: |
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107 return True |
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108 return False |
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109 |
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110 def _check_positional(results): |
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111 positional = None |
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112 for name, char in results: |
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113 if positional is None: |
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114 positional = name is None |
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115 else: |
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116 if (name is None) != positional: |
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117 raise ValueError('format string mixes positional ' |
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118 'and named placeholders') |
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119 return bool(positional) |
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120 |
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121 a, b = map(_parse, (format, alternative)) |
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122 |
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123 # if a does not use string formattings, we are dealing with invalid |
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124 # input data. This function only works if the first string provided |
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125 # does contain string format chars |
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126 if not a: |
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127 raise ValueError('original string provided does not use string ' |
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128 'formatting.') |
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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]): |
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157 raise TranslationErrorError('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])) |
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161 |
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162 |
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163 #: list of builtin checkers for babel installations without setuptools. |
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164 #: Keep this in sync with the mapping in the setup.py |
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165 #: :see: babel.messages.catalog.Catalog.check |
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166 builtin_checkers = [num_plurals, python_format] |