Mercurial > babel > mirror
annotate babel/messages/checkers.py @ 593:99983baf1067 trunk
resort to hard-coded message extractors/checkers if pkg_resources is installed but no egg-info was found (#230)
author | fschwarz |
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date | Thu, 09 Aug 2012 11:20:25 +0000 |
parents | ca203b2af83c |
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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 # |
530 | 3 # Copyright (C) 2007-2011 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 # skip further tests if no catalog is provided. |
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39 elif catalog is None: |
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40 return |
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41 |
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42 msgstrs = message.string |
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43 if not isinstance(msgstrs, (list, tuple)): |
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44 msgstrs = (msgstrs,) |
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45 if len(msgstrs) != catalog.num_plurals: |
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46 raise TranslationError("Wrong number of plural forms (expected %d)" % |
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47 catalog.num_plurals) |
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48 |
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49 |
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50 def python_format(catalog, message): |
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51 """Verify the format string placeholders in the translation.""" |
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52 if 'python-format' not in message.flags: |
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53 return |
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54 msgids = message.id |
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55 if not isinstance(msgids, (list, tuple)): |
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56 msgids = (msgids,) |
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57 msgstrs = message.string |
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58 if not isinstance(msgstrs, (list, tuple)): |
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59 msgstrs = (msgstrs,) |
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60 |
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61 for msgid, msgstr in izip(msgids, msgstrs): |
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62 if msgstr: |
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63 _validate_format(msgid, msgstr) |
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64 |
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65 |
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66 def _validate_format(format, alternative): |
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67 """Test format string `alternative` against `format`. `format` can be the |
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68 msgid of a message and `alternative` one of the `msgstr`\s. The two |
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69 arguments are not interchangeable as `alternative` may contain less |
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70 placeholders if `format` uses named placeholders. |
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71 |
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72 The behavior of this function is undefined if the string does not use |
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73 string formattings. |
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74 |
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75 If the string formatting of `alternative` is compatible to `format` the |
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76 function returns `None`, otherwise a `TranslationError` is raised. |
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77 |
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78 Examples for compatible format strings: |
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79 |
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80 >>> _validate_format('Hello %s!', 'Hallo %s!') |
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81 >>> _validate_format('Hello %i!', 'Hallo %d!') |
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82 |
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83 Example for an incompatible format strings: |
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84 |
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85 >>> _validate_format('Hello %(name)s!', 'Hallo %s!') |
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86 Traceback (most recent call last): |
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87 ... |
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88 TranslationError: the format strings are of different kinds |
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89 |
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90 This function is used by the `python_format` checker. |
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91 |
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92 :param format: The original format string |
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93 :param alternative: The alternative format string that should be checked |
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94 against format |
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95 :return: None on success |
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96 :raises TranslationError: on formatting errors |
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97 """ |
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98 |
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99 def _parse(string): |
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100 result = [] |
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101 for match in PYTHON_FORMAT.finditer(string): |
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102 name, format, typechar = match.groups() |
361 | 103 if typechar == '%' and name is None: |
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104 continue |
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105 result.append((name, str(typechar))) |
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106 return result |
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107 |
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108 def _compatible(a, b): |
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109 if a == b: |
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110 return True |
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111 for set in _string_format_compatibilities: |
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112 if a in set and b in set: |
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113 return True |
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114 return False |
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115 |
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116 def _check_positional(results): |
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117 positional = None |
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118 for name, char in results: |
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119 if positional is None: |
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120 positional = name is None |
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121 else: |
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122 if (name is None) != positional: |
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123 raise TranslationError('format string mixes positional ' |
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124 'and named placeholders') |
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125 return bool(positional) |
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126 |
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127 a, b = map(_parse, (format, alternative)) |
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128 |
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129 # now check if both strings are positional or named |
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130 a_positional, b_positional = map(_check_positional, (a, b)) |
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131 if a_positional and not b_positional and not b: |
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132 raise TranslationError('placeholders are incompatible') |
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133 elif a_positional != b_positional: |
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134 raise TranslationError('the format strings are of different kinds') |
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135 |
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136 # if we are operating on positional strings both must have the |
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137 # same number of format chars and those must be compatible |
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138 if a_positional: |
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139 if len(a) != len(b): |
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140 raise TranslationError('positional format placeholders are ' |
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141 'unbalanced') |
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142 for idx, ((_, first), (_, second)) in enumerate(izip(a, b)): |
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143 if not _compatible(first, second): |
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144 raise TranslationError('incompatible format for placeholder ' |
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145 '%d: %r and %r are not compatible' % |
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146 (idx + 1, first, second)) |
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147 |
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148 # otherwise the second string must not have names the first one |
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149 # doesn't have and the types of those included must be compatible |
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150 else: |
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151 type_map = dict(a) |
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152 for name, typechar in b: |
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153 if name not in type_map: |
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154 raise TranslationError('unknown named placeholder %r' % name) |
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155 elif not _compatible(typechar, type_map[name]): |
364
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156 raise TranslationError('incompatible format for ' |
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157 'placeholder %r: ' |
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158 '%r and %r are not compatible' % |
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159 (name, typechar, type_map[name])) |
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160 |
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161 |
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162 def _find_checkers(): |
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163 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 pass |
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168 else: |
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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 if len(checkers) == 0: |
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172 # if pkg_resources is not available or no usable egg-info was found |
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173 # (see #230), just resort to hard-coded checkers |
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174 return [num_plurals, python_format] |
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175 return checkers |
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176 |
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177 |
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178 checkers = _find_checkers() |