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annotate babel/messages/checkers.py @ 360:6cc92793c047 trunk

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Convert format strings to str for nicer error messages (no u prefix) in the python_format checker.
author aronacher
date Tue, 17 Jun 2008 22:11:09 +0000
parents 9a2618ab9bbc
children 8dd1234e8eab
rev   line source
220
97b4b289e792 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
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
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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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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 # 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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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 If `format` does not use string formatting a `ValueError` is raised.
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73
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74 If the string formatting of `alternative` is compatible to `format` the
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75 function returns `None`, otherwise a `TranslationError` is raised.
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76
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77 Examples for compatible format strings:
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78
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79 >>> _validate_format('Hello %s!', 'Hallo %s!')
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80 >>> _validate_format('Hello %i!', 'Hallo %d!')
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81
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82 Example for an incompatible format strings:
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83
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84 >>> _validate_format('Hello %(name)s!', 'Hallo %s!')
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85 Traceback (most recent call last):
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86 ...
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87 TranslationError: the format strings are of different kinds
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88
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89 This function is used by the `python_format` checker.
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90
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91 :param format: The original format string
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92 :param alternative: The alternative format string that should be checked
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93 against format
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94 :return: None on success
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95 :raises TranslationError: on formatting errors
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96 """
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97
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98 def _parse(string):
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99 result = []
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100 for match in PYTHON_FORMAT.finditer(string):
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101 name, format, typechar = match.groups()
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102 if typechar == '%' and name is not None:
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103 continue
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104 result.append((name, str(typechar)))
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105 return result
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106
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107 def _compatible(a, b):
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108 if a == b:
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109 return True
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110 for set in _string_format_compatibilities:
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111 if a in set and b in set:
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112 return True
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113 return False
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114
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115 def _check_positional(results):
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116 positional = None
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117 for name, char in results:
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118 if positional is None:
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119 positional = name is None
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120 else:
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121 if (name is None) != positional:
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122 raise TranslationError('format string mixes positional '
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123 'and named placeholders')
352
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124 return bool(positional)
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125
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126 a, b = map(_parse, (format, alternative))
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127
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128 # if a does not use string formattings, we are dealing with invalid
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129 # input data. This function only works if the first string provided
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130 # does contain string format chars
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131 if not a:
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132 raise ValueError('original string provided does not use string '
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133 'formatting.')
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134
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135 # now check if both strings are positional or named
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136 a_positional, b_positional = map(_check_positional, (a, b))
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137 if a_positional and not b_positional and not b:
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138 raise TranslationError('placeholders are incompatible')
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139 elif a_positional != b_positional:
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140 raise TranslationError('the format strings are of different kinds')
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141
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142 # if we are operating on positional strings both must have the
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143 # same number of format chars and those must be compatible
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144 if a_positional:
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145 if len(a) != len(b):
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146 raise TranslationError('positional format placeholders are '
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147 'unbalanced')
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148 for idx, ((_, first), (_, second)) in enumerate(izip(a, b)):
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149 if not _compatible(first, second):
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150 raise TranslationError('incompatible format for placeholder '
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151 '%d: %r and %r are not compatible' %
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152 (idx + 1, first, second))
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153
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154 # otherwise the second string must not have names the first one
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155 # doesn't have and the types of those included must be compatible
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156 else:
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157 type_map = dict(a)
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158 for name, typechar in b:
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159 if name not in type_map:
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160 raise TranslationError('unknown named placeholder %r' % name)
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161 elif not _compatible(typechar, type_map[name]):
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162 raise TranslationErrorError('incompatible format for '
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163 'placeholder %r: '
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164 '%r and %r are not compatible' %
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165 (name, typechar, type_map[name]))
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166
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167
355
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168 def _find_checkers():
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169 try:
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170 from pkg_resources import working_set
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171 except ImportError:
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172 return [num_plurals, python_format]
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173 checkers = []
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174 for entry_point in working_set.iter_entry_points('babel.checkers'):
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175 checkers.append(entry_point.load())
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176 return checkers
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177
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178
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179 checkers = _find_checkers()
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