annotate babel/messages/catalog.py @ 165:eafaa302dde1

Added preliminary catalog updating/merging functionality.
author cmlenz
date Fri, 22 Jun 2007 00:33:22 +0000
parents 12e5f21dfcda
children 533baef258bb
rev   line source
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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
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14 """Data structures for message catalogs."""
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15
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16 from cgi import parse_header
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17 from datetime import datetime
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18 from email import message_from_string
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19 import re
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20 try:
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21 set
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22 except NameError:
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23 from sets import Set as set
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24 import time
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25
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26 from babel import __version__ as VERSION
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27 from babel.core import Locale
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28 from babel.dates import format_datetime
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29 from babel.messages.plurals import PLURALS
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30 from babel.util import odict, LOCALTZ, UTC, FixedOffsetTimezone
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31
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32 __all__ = ['Message', 'Catalog']
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33 __docformat__ = 'restructuredtext en'
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34
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35 PYTHON_FORMAT = re.compile(r'\%(\([\w]+\))?[diouxXeEfFgGcrs]').search
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36
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37
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38 class Message(object):
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39 """Representation of a single message in a catalog."""
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40
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41 def __init__(self, id, string=u'', locations=(), flags=(), auto_comments=(),
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42 user_comments=()):
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43 """Create the message object.
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44
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45 :param id: the message ID, or a ``(singular, plural)`` tuple for
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46 pluralizable messages
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47 :param string: the translated message string, or a
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48 ``(singular, plural)`` tuple for pluralizable messages
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49 :param locations: a sequence of ``(filenname, lineno)`` tuples
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50 :param flags: a set or sequence of flags
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51 :param auto_comments: a sequence of automatic comments for the message
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52 :param user_comments: a sequence of user comments for the message
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53 """
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54 self.id = id #: The message ID
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55 if not string and self.pluralizable:
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56 string = (u'', u'')
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57 self.string = string #: The message translation
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58 self.locations = list(locations)
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59 self.flags = set(flags)
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60 if id and self.python_format:
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61 self.flags.add('python-format')
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62 else:
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63 self.flags.discard('python-format')
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64 self.auto_comments = list(auto_comments)
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65 self.user_comments = list(user_comments)
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66
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67 def __repr__(self):
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68 return '<%s %r>' % (type(self).__name__, self.id)
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69
69
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70 def fuzzy(self):
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71 return 'fuzzy' in self.flags
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72 fuzzy = property(fuzzy, doc="""\
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73 Whether the translation is fuzzy.
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74
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75 >>> Message('foo').fuzzy
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76 False
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77 >>> Message('foo', 'foo', flags=['fuzzy']).fuzzy
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78 True
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79
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80 :type: `bool`
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81 """)
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82
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83 def pluralizable(self):
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84 return isinstance(self.id, (list, tuple))
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85 pluralizable = property(pluralizable, doc="""\
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86 Whether the message is plurizable.
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87
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88 >>> Message('foo').pluralizable
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89 False
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90 >>> Message(('foo', 'bar')).pluralizable
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91 True
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92
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93 :type: `bool`
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94 """)
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95
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96 def python_format(self):
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97 ids = self.id
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98 if not isinstance(ids, (list, tuple)):
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99 ids = [ids]
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100 return bool(filter(None, [PYTHON_FORMAT(id) for id in ids]))
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101 python_format = property(python_format, doc="""\
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102 Whether the message contains Python-style parameters.
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103
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104 >>> Message('foo %(name)s bar').python_format
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105 True
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106 >>> Message(('foo %(name)s', 'foo %(name)s')).python_format
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107 True
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108
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109 :type: `bool`
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110 """)
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111
107
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112
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113 DEFAULT_HEADER = u"""\
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114 # Translations template for PROJECT.
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115 # Copyright (C) YEAR ORGANIZATION
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116 # This file is distributed under the same license as the PROJECT project.
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117 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
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118 #"""
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119
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120 class Catalog(object):
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121 """Representation of a message catalog."""
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122
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123 def __init__(self, locale=None, domain=None, header_comment=DEFAULT_HEADER,
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124 project=None, version=None, copyright_holder=None,
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125 msgid_bugs_address=None, creation_date=None,
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126 revision_date=None, last_translator=None, charset='utf-8'):
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127 """Initialize the catalog object.
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128
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129 :param locale: the locale identifier or `Locale` object, or `None`
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130 if the catalog is not bound to a locale (which basically
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131 means it's a template)
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132 :param domain: the message domain
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133 :param header_comment: the header comment as string, or `None` for the
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134 default header
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135 :param project: the project's name
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136 :param version: the project's version
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137 :param copyright_holder: the copyright holder of the catalog
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138 :param msgid_bugs_address: the email address or URL to submit bug
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139 reports to
80
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140 :param creation_date: the date the catalog was created
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141 :param revision_date: the date the catalog was revised
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142 :param last_translator: the name and email of the last translator
106
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143 :param charset: the encoding to use in the output
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144 """
109
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145 self.domain = domain #: The message domain
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146 if locale:
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147 locale = Locale.parse(locale)
109
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148 self.locale = locale #: The locale or `None`
106
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149 self._header_comment = header_comment
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150 self._messages = odict()
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151
109
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152 self.project = project or 'PROJECT' #: The project name
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153 self.version = version or 'VERSION' #: The project version
106
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154 self.copyright_holder = copyright_holder or 'ORGANIZATION'
80
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155 self.msgid_bugs_address = msgid_bugs_address or 'EMAIL@ADDRESS'
108
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156
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157 self.last_translator = last_translator or 'FULL NAME <EMAIL@ADDRESS>'
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158 """Name and email address of the last translator."""
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159
97
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160 self.charset = charset or 'utf-8'
86
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161
69
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162 if creation_date is None:
99
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163 creation_date = datetime.now(LOCALTZ)
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164 elif isinstance(creation_date, datetime) and not creation_date.tzinfo:
99
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165 creation_date = creation_date.replace(tzinfo=LOCALTZ)
109
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166 self.creation_date = creation_date #: Creation date of the template
69
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167 if revision_date is None:
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168 revision_date = datetime.now(LOCALTZ)
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169 elif isinstance(revision_date, datetime) and not revision_date.tzinfo:
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170 revision_date = revision_date.replace(tzinfo=LOCALTZ)
109
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171 self.revision_date = revision_date #: Last revision date of the catalog
69
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172
109
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173 def _get_header_comment(self):
106
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174 comment = self._header_comment
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175 comment = comment.replace('PROJECT', self.project) \
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176 .replace('VERSION', self.version) \
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177 .replace('YEAR', self.revision_date.strftime('%Y')) \
122
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178 .replace('ORGANIZATION', self.copyright_holder)
106
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179 if self.locale:
109
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180 comment = comment.replace('Translations template', '%s translations'
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181 % self.locale.english_name)
106
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182 return comment
122
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183
109
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184 def _set_header_comment(self, string):
106
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185 self._header_comment = string
109
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186
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187 header_comment = property(_get_header_comment, _set_header_comment, doc="""\
106
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188 The header comment for the catalog.
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189
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190 >>> catalog = Catalog(project='Foobar', version='1.0',
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191 ... copyright_holder='Foo Company')
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192 >>> print catalog.header_comment
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193 # Translations template for Foobar.
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194 # Copyright (C) 2007 Foo Company
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195 # This file is distributed under the same license as the Foobar project.
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196 # FIRST AUTHOR <EMAIL@ADDRESS>, 2007.
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197 #
108
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198
122
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199 The header can also be set from a string. Any known upper-case variables
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200 will be replaced when the header is retrieved again:
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201
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202 >>> catalog = Catalog(project='Foobar', version='1.0',
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203 ... copyright_holder='Foo Company')
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204 >>> catalog.header_comment = '''\\
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205 ... # The POT for my really cool PROJECT project.
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206 ... # Copyright (C) 1990-2003 ORGANIZATION
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207 ... # This file is distributed under the same license as the PROJECT
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208 ... # project.
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209 ... #'''
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210 >>> print catalog.header_comment
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211 # The POT for my really cool Foobar project.
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212 # Copyright (C) 1990-2003 Foo Company
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213 # This file is distributed under the same license as the Foobar
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214 # project.
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215 #
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216
106
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217 :type: `unicode`
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218 """)
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219
108
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220 def _get_mime_headers(self):
69
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221 headers = []
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222 headers.append(('Project-Id-Version',
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223 '%s %s' % (self.project, self.version)))
80
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224 headers.append(('Report-Msgid-Bugs-To', self.msgid_bugs_address))
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225 headers.append(('POT-Creation-Date',
133
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226 format_datetime(self.creation_date, 'yyyy-MM-dd HH:mmZ',
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227 locale='en')))
69
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228 if self.locale is None:
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229 headers.append(('PO-Revision-Date', 'YEAR-MO-DA HO:MI+ZONE'))
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230 headers.append(('Last-Translator', 'FULL NAME <EMAIL@ADDRESS>'))
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231 headers.append(('Language-Team', 'LANGUAGE <LL@li.org>'))
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232 else:
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233 headers.append(('PO-Revision-Date',
133
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234 format_datetime(self.revision_date,
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235 'yyyy-MM-dd HH:mmZ', locale='en')))
69
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236 headers.append(('Last-Translator', self.last_translator))
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237 headers.append(('Language-Team', '%s <LL@li.org>' % self.locale))
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238 headers.append(('Plural-Forms', self.plural_forms))
69
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239 headers.append(('MIME-Version', '1.0'))
70
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240 headers.append(('Content-Type',
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241 'text/plain; charset=%s' % self.charset))
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242 headers.append(('Content-Transfer-Encoding', '8bit'))
107
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243 headers.append(('Generated-By', 'Babel %s\n' % VERSION))
69
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diff changeset
244 return headers
108
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245
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246 def _set_mime_headers(self, headers):
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247 for name, value in headers:
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248 name = name.lower()
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249 if name == 'project-id-version':
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250 parts = value.split(' ')
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251 self.project = ' '.join(parts[:-1])
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252 self.version = parts[-1]
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253 elif name == 'report-msgid-bugs-to':
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254 self.msgid_bugs_address = value
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255 elif name == 'last-translator':
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256 self.last_translator = value
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257 elif name == 'pot-creation-date':
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258 # FIXME: this should use dates.parse_datetime as soon as that
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259 # is ready
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diff changeset
260 value, tzoffset, _ = re.split('[+-](\d{4})$', value, 1)
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261 tt = time.strptime(value, '%Y-%m-%d %H:%M')
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262 ts = time.mktime(tt)
122
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diff changeset
263 tzoffset = FixedOffsetTimezone(int(tzoffset[:2]) * 60 +
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diff changeset
264 int(tzoffset[2:]))
123
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diff changeset
265 dt = datetime.fromtimestamp(ts)
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266 self.creation_date = dt.replace(tzinfo=tzoffset)
151
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267 elif name == 'content-type':
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268 mimetype, params = parse_header(value)
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269 if 'charset' in params:
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270 self.charset = params['charset'].lower()
108
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271
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272 mime_headers = property(_get_mime_headers, _set_mime_headers, doc="""\
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273 The MIME headers of the catalog, used for the special ``msgid ""`` entry.
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274
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275 The behavior of this property changes slightly depending on whether a locale
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276 is set or not, the latter indicating that the catalog is actually a template
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277 for actual translations.
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278
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279 Here's an example of the output for such a catalog template:
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280
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281 >>> created = datetime(1990, 4, 1, 15, 30, tzinfo=UTC)
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282 >>> catalog = Catalog(project='Foobar', version='1.0',
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283 ... creation_date=created)
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284 >>> for name, value in catalog.mime_headers:
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285 ... print '%s: %s' % (name, value)
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286 Project-Id-Version: Foobar 1.0
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287 Report-Msgid-Bugs-To: EMAIL@ADDRESS
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288 POT-Creation-Date: 1990-04-01 15:30+0000
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289 PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
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290 Last-Translator: FULL NAME <EMAIL@ADDRESS>
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291 Language-Team: LANGUAGE <LL@li.org>
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292 MIME-Version: 1.0
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293 Content-Type: text/plain; charset=utf-8
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294 Content-Transfer-Encoding: 8bit
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295 Generated-By: Babel ...
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296
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297 And here's an example of the output when the locale is set:
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298
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299 >>> revised = datetime(1990, 8, 3, 12, 0, tzinfo=UTC)
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300 >>> catalog = Catalog(locale='de_DE', project='Foobar', version='1.0',
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301 ... creation_date=created, revision_date=revised,
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302 ... last_translator='John Doe <jd@example.com>')
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303 >>> for name, value in catalog.mime_headers:
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304 ... print '%s: %s' % (name, value)
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305 Project-Id-Version: Foobar 1.0
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306 Report-Msgid-Bugs-To: EMAIL@ADDRESS
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307 POT-Creation-Date: 1990-04-01 15:30+0000
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308 PO-Revision-Date: 1990-08-03 12:00+0000
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309 Last-Translator: John Doe <jd@example.com>
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310 Language-Team: de_DE <LL@li.org>
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311 Plural-Forms: nplurals=2; plural=(n != 1)
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312 MIME-Version: 1.0
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313 Content-Type: text/plain; charset=utf-8
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314 Content-Transfer-Encoding: 8bit
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315 Generated-By: Babel ...
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316
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317 :type: `list`
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318 """)
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319
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320 def num_plurals(self):
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321 num = 2
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322 if self.locale:
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323 if str(self.locale) in PLURALS:
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324 num = PLURALS[str(self.locale)][0]
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325 elif self.locale.language in PLURALS:
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326 num = PLURALS[self.locale.language][0]
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327 return num
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328 num_plurals = property(num_plurals, doc="""\
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329 The number of plurals used by the locale.
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330
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331 >>> Catalog(locale='en').num_plurals
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332 2
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333 >>> Catalog(locale='cs_CZ').num_plurals
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334 3
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335
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336 :type: `int`
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337 """)
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338
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339 def plural_forms(self):
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340 num, expr = ('INTEGER', 'EXPRESSION')
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341 if self.locale:
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342 if str(self.locale) in PLURALS:
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343 num, expr = PLURALS[str(self.locale)]
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344 elif self.locale.language in PLURALS:
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345 num, expr = PLURALS[self.locale.language]
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346 return 'nplurals=%s; plural=%s' % (num, expr)
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347 plural_forms = property(plural_forms, doc="""\
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348 Return the plural forms declaration for the locale.
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349
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350 >>> Catalog(locale='en').plural_forms
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351 'nplurals=2; plural=(n != 1)'
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352 >>> Catalog(locale='pt_BR').plural_forms
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353 'nplurals=2; plural=(n > 1)'
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354
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355 :type: `str`
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356 """)
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357
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358 def __contains__(self, id):
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359 """Return whether the catalog has a message with the specified ID."""
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360 return self._key_for(id) in self._messages
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361
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362 def __len__(self):
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363 """The number of messages in the catalog.
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364
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365 This does not include the special ``msgid ""`` entry.
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366 """
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367 return len(self._messages)
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368
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369 def __iter__(self):
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370 """Iterates through all the entries in the catalog, in the order they
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371 were added, yielding a `Message` object for every entry.
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372
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373 :rtype: ``iterator``
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374 """
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375 buf = []
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376 for name, value in self.mime_headers:
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377 buf.append('%s: %s' % (name, value))
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378 yield Message('', '\n'.join(buf), flags=set(['fuzzy']))
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379 for key in self._messages:
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380 yield self._messages[key]
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381
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382 def __repr__(self):
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383 locale = ''
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384 if self.locale:
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385 locale = ' %s' % self.locale
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386 return '<%s %r%s>' % (type(self).__name__, self.domain, locale)
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387
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388 def __delitem__(self, id):
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389 """Delete the message with the specified ID."""
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390 key = self._key_for(id)
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391 if key in self._messages:
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392 del self._messages[key]
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393
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394 def __getitem__(self, id):
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395 """Return the message with the specified ID.
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396
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397 :param id: the message ID
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398 :return: the message with the specified ID, or `None` if no such message
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399 is in the catalog
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400 :rtype: `Message`
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401 """
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402 return self._messages.get(self._key_for(id))
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403
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404 def __setitem__(self, id, message):
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405 """Add or update the message with the specified ID.
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406
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407 >>> catalog = Catalog()
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408 >>> catalog[u'foo'] = Message(u'foo')
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409 >>> catalog[u'foo']
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410 <Message u'foo'>
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411
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412 If a message with that ID is already in the catalog, it is updated
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413 to include the locations and flags of the new message.
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414
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415 >>> catalog = Catalog()
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416 >>> catalog[u'foo'] = Message(u'foo', locations=[('main.py', 1)])
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417 >>> catalog[u'foo'].locations
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418 [('main.py', 1)]
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419 >>> catalog[u'foo'] = Message(u'foo', locations=[('utils.py', 5)])
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420 >>> catalog[u'foo'].locations
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421 [('main.py', 1), ('utils.py', 5)]
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422
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423 :param id: the message ID
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424 :param message: the `Message` object
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425 """
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426 assert isinstance(message, Message), 'expected a Message object'
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427 key = self._key_for(id)
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428 current = self._messages.get(key)
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429 if current:
71
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430 if message.pluralizable and not current.pluralizable:
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431 # The new message adds pluralization
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432 current.id = message.id
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433 current.string = message.string
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434 current.locations.extend(message.locations)
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435 current.auto_comments.extend(message.auto_comments)
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436 current.user_comments.extend(message.user_comments)
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437 current.flags |= message.flags
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438 message = current
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439 elif id == '':
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440 # special treatment for the header message
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441 headers = message_from_string(message.string.encode(self.charset))
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442 self.mime_headers = headers.items()
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443 self.header_comment = '\n'.join(['# %s' % comment for comment
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444 in message.user_comments])
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445 else:
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446 if isinstance(id, (list, tuple)):
70
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447 assert isinstance(message.string, (list, tuple))
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448 self._messages[key] = message
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449
107
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450 def add(self, id, string=None, locations=(), flags=(), auto_comments=(),
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451 user_comments=()):
66
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452 """Add or update the message with the specified ID.
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453
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454 >>> catalog = Catalog()
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455 >>> catalog.add(u'foo')
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456 >>> catalog[u'foo']
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457 <Message u'foo'>
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458
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459 This method simply constructs a `Message` object with the given
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460 arguments and invokes `__setitem__` with that object.
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461
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462 :param id: the message ID, or a ``(singular, plural)`` tuple for
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463 pluralizable messages
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464 :param string: the translated message string, or a
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465 ``(singular, plural)`` tuple for pluralizable messages
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466 :param locations: a sequence of ``(filenname, lineno)`` tuples
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467 :param flags: a set or sequence of flags
108
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468 :param auto_comments: a sequence of automatic comments
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469 :param user_comments: a sequence of user comments
66
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470 """
107
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471 self[id] = Message(id, string, list(locations), flags, auto_comments,
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472 user_comments)
71
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473
165
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474 def update(self, template):
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475 """Update the catalog based on the given template catalog.
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476
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477 >>> from babel.messages import Catalog
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478 >>> template = Catalog()
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479 >>> template.add('blue', locations=[('main.py', 100)])
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480 >>> template.add(('salad', 'salads'), locations=[('util.py', 42)])
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481 >>> catalog = Catalog(locale='de_DE')
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482 >>> catalog.add('blue', u'blau', locations=[('main.py', 98)])
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483 >>> catalog.add('head', u'Kopf', locations=[('util.py', 33)])
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484 >>> catalog.add(('salad', 'salads'), (u'Salat', u'Salate'),
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485 ... locations=[('util.py', 38)])
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486
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487 >>> rest = catalog.update(template)
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488 >>> len(catalog)
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489 2
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490
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491 >>> msg1 = catalog['blue']
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492 >>> msg1.string
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493 u'blau'
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494 >>> msg1.locations
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495 [('main.py', 100)]
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496
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497 >>> msg2 = catalog['salad']
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498 >>> msg2.string
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499 (u'Salat', u'Salate')
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500 >>> msg2.locations
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501 [('util.py', 42)]
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502
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503 >>> 'head' in catalog
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504 False
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505 >>> rest
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506 [<Message 'head'>]
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507
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508 :param template: the reference catalog, usually read from a POT file
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509 :return: a list of `Message` objects that the catalog contained before
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510 the updated, but couldn't be found in the template
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511 """
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512 rest = odict([(message.id, message) for message in self if message.id])
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513 messages = self._messages
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514 self._messages = odict()
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515
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516 for message in template:
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517 if message.id:
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518 key = self._key_for(message.id)
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519 if key in messages:
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520 oldmsg = messages.pop(key)
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521 message.string = oldmsg.string
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522 message.flags |= oldmsg.flags
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523 self[message.id] = message
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524 del rest[message.id]
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525 else:
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526 for oldmsg in messages:
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527 # TODO: fuzzy matching
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528 pass
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529 else:
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530 self[message.id] = message
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531
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532 return rest.values()
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533
71
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534 def _key_for(self, id):
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535 """The key for a message is just the singular ID even for pluralizable
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536 messages.
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537 """
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538 key = id
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539 if isinstance(key, (list, tuple)):
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540 key = id[0]
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541 return key
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