annotate babel/messages/catalog.py @ 167:533baef258bb

Implement fuzzy matching to catalog updates. No frontend yet.
author cmlenz
date Fri, 22 Jun 2007 08:39:04 +0000
parents eafaa302dde1
children 47f6c31e9a24
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 difflib import get_close_matches
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19 from email import message_from_string
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20 import re
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21 try:
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22 set
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23 except NameError:
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24 from sets import Set as set
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25 import time
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26
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27 from babel import __version__ as VERSION
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28 from babel.core import Locale
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29 from babel.dates import format_datetime
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30 from babel.messages.plurals import PLURALS
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31 from babel.util import odict, LOCALTZ, UTC, FixedOffsetTimezone
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32
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33 __all__ = ['Message', 'Catalog']
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34 __docformat__ = 'restructuredtext en'
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35
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36 PYTHON_FORMAT = re.compile(r'\%(\([\w]+\))?[diouxXeEfFgGcrs]').search
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37
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38
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39 class Message(object):
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40 """Representation of a single message in a catalog."""
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41
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42 def __init__(self, id, string=u'', locations=(), flags=(), auto_comments=(),
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43 user_comments=()):
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44 """Create the message object.
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45
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46 :param id: the message ID, or a ``(singular, plural)`` tuple for
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47 pluralizable messages
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48 :param string: the translated message string, or a
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49 ``(singular, plural)`` tuple for pluralizable messages
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50 :param locations: a sequence of ``(filenname, lineno)`` tuples
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51 :param flags: a set or sequence of flags
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52 :param auto_comments: a sequence of automatic comments for the message
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53 :param user_comments: a sequence of user comments for the message
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54 """
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55 self.id = id #: The message ID
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56 if not string and self.pluralizable:
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57 string = (u'', u'')
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58 self.string = string #: The message translation
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59 self.locations = list(locations)
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60 self.flags = set(flags)
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61 if id and self.python_format:
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62 self.flags.add('python-format')
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63 else:
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64 self.flags.discard('python-format')
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65 self.auto_comments = list(auto_comments)
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66 self.user_comments = list(user_comments)
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67
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68 def __repr__(self):
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69 return '<%s %r>' % (type(self).__name__, self.id)
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70
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71 def fuzzy(self):
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72 return 'fuzzy' in self.flags
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73 fuzzy = property(fuzzy, doc="""\
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74 Whether the translation is fuzzy.
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75
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76 >>> Message('foo').fuzzy
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77 False
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78 >>> Message('foo', 'foo', flags=['fuzzy']).fuzzy
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79 True
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80
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81 :type: `bool`
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82 """)
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83
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84 def pluralizable(self):
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85 return isinstance(self.id, (list, tuple))
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86 pluralizable = property(pluralizable, doc="""\
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87 Whether the message is plurizable.
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88
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89 >>> Message('foo').pluralizable
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90 False
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91 >>> Message(('foo', 'bar')).pluralizable
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92 True
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93
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94 :type: `bool`
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95 """)
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96
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97 def python_format(self):
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98 ids = self.id
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99 if not isinstance(ids, (list, tuple)):
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100 ids = [ids]
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101 return bool(filter(None, [PYTHON_FORMAT(id) for id in ids]))
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102 python_format = property(python_format, doc="""\
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103 Whether the message contains Python-style parameters.
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104
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105 >>> Message('foo %(name)s bar').python_format
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106 True
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107 >>> Message(('foo %(name)s', 'foo %(name)s')).python_format
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108 True
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109
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110 :type: `bool`
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111 """)
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112
107
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113
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114 DEFAULT_HEADER = u"""\
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115 # Translations template for PROJECT.
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116 # Copyright (C) YEAR ORGANIZATION
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117 # This file is distributed under the same license as the PROJECT project.
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118 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
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119 #"""
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120
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121 class Catalog(object):
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122 """Representation of a message catalog."""
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123
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124 def __init__(self, locale=None, domain=None, header_comment=DEFAULT_HEADER,
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125 project=None, version=None, copyright_holder=None,
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126 msgid_bugs_address=None, creation_date=None,
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127 revision_date=None, last_translator=None, charset='utf-8'):
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128 """Initialize the catalog object.
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129
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130 :param locale: the locale identifier or `Locale` object, or `None`
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131 if the catalog is not bound to a locale (which basically
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132 means it's a template)
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133 :param domain: the message domain
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134 :param header_comment: the header comment as string, or `None` for the
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135 default header
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136 :param project: the project's name
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137 :param version: the project's version
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138 :param copyright_holder: the copyright holder of the catalog
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139 :param msgid_bugs_address: the email address or URL to submit bug
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140 reports to
80
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141 :param creation_date: the date the catalog was created
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142 :param revision_date: the date the catalog was revised
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143 :param last_translator: the name and email of the last translator
106
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144 :param charset: the encoding to use in the output
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145 """
109
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146 self.domain = domain #: The message domain
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147 if locale:
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148 locale = Locale.parse(locale)
109
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149 self.locale = locale #: The locale or `None`
106
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150 self._header_comment = header_comment
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151 self._messages = odict()
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152
109
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153 self.project = project or 'PROJECT' #: The project name
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154 self.version = version or 'VERSION' #: The project version
106
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155 self.copyright_holder = copyright_holder or 'ORGANIZATION'
80
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156 self.msgid_bugs_address = msgid_bugs_address or 'EMAIL@ADDRESS'
108
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157
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158 self.last_translator = last_translator or 'FULL NAME <EMAIL@ADDRESS>'
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159 """Name and email address of the last translator."""
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160
97
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161 self.charset = charset or 'utf-8'
86
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162
69
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163 if creation_date is None:
99
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164 creation_date = datetime.now(LOCALTZ)
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165 elif isinstance(creation_date, datetime) and not creation_date.tzinfo:
99
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166 creation_date = creation_date.replace(tzinfo=LOCALTZ)
109
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167 self.creation_date = creation_date #: Creation date of the template
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168 if revision_date is None:
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169 revision_date = datetime.now(LOCALTZ)
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170 elif isinstance(revision_date, datetime) and not revision_date.tzinfo:
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171 revision_date = revision_date.replace(tzinfo=LOCALTZ)
109
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172 self.revision_date = revision_date #: Last revision date of the catalog
69
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173
109
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174 def _get_header_comment(self):
106
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175 comment = self._header_comment
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176 comment = comment.replace('PROJECT', self.project) \
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177 .replace('VERSION', self.version) \
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178 .replace('YEAR', self.revision_date.strftime('%Y')) \
122
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179 .replace('ORGANIZATION', self.copyright_holder)
106
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180 if self.locale:
109
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181 comment = comment.replace('Translations template', '%s translations'
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182 % self.locale.english_name)
106
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183 return comment
122
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184
109
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185 def _set_header_comment(self, string):
106
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186 self._header_comment = string
109
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187
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188 header_comment = property(_get_header_comment, _set_header_comment, doc="""\
106
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189 The header comment for the catalog.
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190
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191 >>> catalog = Catalog(project='Foobar', version='1.0',
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192 ... copyright_holder='Foo Company')
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193 >>> print catalog.header_comment
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194 # Translations template for Foobar.
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195 # Copyright (C) 2007 Foo Company
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196 # This file is distributed under the same license as the Foobar project.
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197 # FIRST AUTHOR <EMAIL@ADDRESS>, 2007.
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198 #
108
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199
122
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200 The header can also be set from a string. Any known upper-case variables
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201 will be replaced when the header is retrieved again:
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202
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203 >>> catalog = Catalog(project='Foobar', version='1.0',
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204 ... copyright_holder='Foo Company')
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205 >>> catalog.header_comment = '''\\
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206 ... # The POT for my really cool PROJECT project.
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207 ... # Copyright (C) 1990-2003 ORGANIZATION
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208 ... # This file is distributed under the same license as the PROJECT
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209 ... # project.
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210 ... #'''
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211 >>> print catalog.header_comment
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212 # The POT for my really cool Foobar project.
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213 # Copyright (C) 1990-2003 Foo Company
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214 # This file is distributed under the same license as the Foobar
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215 # project.
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216 #
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217
106
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218 :type: `unicode`
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219 """)
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220
108
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221 def _get_mime_headers(self):
69
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222 headers = []
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223 headers.append(('Project-Id-Version',
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224 '%s %s' % (self.project, self.version)))
80
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225 headers.append(('Report-Msgid-Bugs-To', self.msgid_bugs_address))
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226 headers.append(('POT-Creation-Date',
133
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227 format_datetime(self.creation_date, 'yyyy-MM-dd HH:mmZ',
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228 locale='en')))
69
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229 if self.locale is None:
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230 headers.append(('PO-Revision-Date', 'YEAR-MO-DA HO:MI+ZONE'))
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231 headers.append(('Last-Translator', 'FULL NAME <EMAIL@ADDRESS>'))
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232 headers.append(('Language-Team', 'LANGUAGE <LL@li.org>'))
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233 else:
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234 headers.append(('PO-Revision-Date',
133
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235 format_datetime(self.revision_date,
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236 'yyyy-MM-dd HH:mmZ', locale='en')))
69
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237 headers.append(('Last-Translator', self.last_translator))
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238 headers.append(('Language-Team', '%s <LL@li.org>' % self.locale))
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239 headers.append(('Plural-Forms', self.plural_forms))
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240 headers.append(('MIME-Version', '1.0'))
70
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241 headers.append(('Content-Type',
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242 'text/plain; charset=%s' % self.charset))
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243 headers.append(('Content-Transfer-Encoding', '8bit'))
107
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244 headers.append(('Generated-By', 'Babel %s\n' % VERSION))
69
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245 return headers
108
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246
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247 def _set_mime_headers(self, headers):
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248 for name, value in headers:
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249 name = name.lower()
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250 if name == 'project-id-version':
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251 parts = value.split(' ')
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252 self.project = ' '.join(parts[:-1])
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253 self.version = parts[-1]
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254 elif name == 'report-msgid-bugs-to':
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255 self.msgid_bugs_address = value
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256 elif name == 'last-translator':
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257 self.last_translator = value
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258 elif name == 'pot-creation-date':
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259 # FIXME: this should use dates.parse_datetime as soon as that
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260 # is ready
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diff changeset
261 value, tzoffset, _ = re.split('[+-](\d{4})$', value, 1)
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262 tt = time.strptime(value, '%Y-%m-%d %H:%M')
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263 ts = time.mktime(tt)
122
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264 tzoffset = FixedOffsetTimezone(int(tzoffset[:2]) * 60 +
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diff changeset
265 int(tzoffset[2:]))
123
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266 dt = datetime.fromtimestamp(ts)
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267 self.creation_date = dt.replace(tzinfo=tzoffset)
151
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268 elif name == 'content-type':
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269 mimetype, params = parse_header(value)
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270 if 'charset' in params:
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271 self.charset = params['charset'].lower()
108
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272
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273 mime_headers = property(_get_mime_headers, _set_mime_headers, doc="""\
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274 The MIME headers of the catalog, used for the special ``msgid ""`` entry.
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275
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276 The behavior of this property changes slightly depending on whether a locale
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277 is set or not, the latter indicating that the catalog is actually a template
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278 for actual translations.
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279
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280 Here's an example of the output for such a catalog template:
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281
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282 >>> created = datetime(1990, 4, 1, 15, 30, tzinfo=UTC)
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283 >>> catalog = Catalog(project='Foobar', version='1.0',
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284 ... creation_date=created)
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285 >>> for name, value in catalog.mime_headers:
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286 ... print '%s: %s' % (name, value)
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287 Project-Id-Version: Foobar 1.0
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288 Report-Msgid-Bugs-To: EMAIL@ADDRESS
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289 POT-Creation-Date: 1990-04-01 15:30+0000
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290 PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE
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291 Last-Translator: FULL NAME <EMAIL@ADDRESS>
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292 Language-Team: LANGUAGE <LL@li.org>
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293 MIME-Version: 1.0
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294 Content-Type: text/plain; charset=utf-8
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295 Content-Transfer-Encoding: 8bit
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296 Generated-By: Babel ...
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297
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298 And here's an example of the output when the locale is set:
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299
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300 >>> revised = datetime(1990, 8, 3, 12, 0, tzinfo=UTC)
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301 >>> catalog = Catalog(locale='de_DE', project='Foobar', version='1.0',
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302 ... creation_date=created, revision_date=revised,
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303 ... last_translator='John Doe <jd@example.com>')
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304 >>> for name, value in catalog.mime_headers:
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305 ... print '%s: %s' % (name, value)
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306 Project-Id-Version: Foobar 1.0
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307 Report-Msgid-Bugs-To: EMAIL@ADDRESS
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308 POT-Creation-Date: 1990-04-01 15:30+0000
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309 PO-Revision-Date: 1990-08-03 12:00+0000
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310 Last-Translator: John Doe <jd@example.com>
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311 Language-Team: de_DE <LL@li.org>
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312 Plural-Forms: nplurals=2; plural=(n != 1)
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313 MIME-Version: 1.0
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314 Content-Type: text/plain; charset=utf-8
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315 Content-Transfer-Encoding: 8bit
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316 Generated-By: Babel ...
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317
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318 :type: `list`
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319 """)
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320
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321 def num_plurals(self):
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322 num = 2
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323 if self.locale:
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324 if str(self.locale) in PLURALS:
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325 num = PLURALS[str(self.locale)][0]
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326 elif self.locale.language in PLURALS:
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327 num = PLURALS[self.locale.language][0]
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328 return num
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329 num_plurals = property(num_plurals, doc="""\
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330 The number of plurals used by the locale.
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331
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332 >>> Catalog(locale='en').num_plurals
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333 2
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334 >>> Catalog(locale='cs_CZ').num_plurals
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335 3
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336
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337 :type: `int`
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338 """)
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339
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340 def plural_forms(self):
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341 num, expr = ('INTEGER', 'EXPRESSION')
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342 if self.locale:
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343 if str(self.locale) in PLURALS:
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344 num, expr = PLURALS[str(self.locale)]
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345 elif self.locale.language in PLURALS:
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346 num, expr = PLURALS[self.locale.language]
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347 return 'nplurals=%s; plural=%s' % (num, expr)
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348 plural_forms = property(plural_forms, doc="""\
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349 Return the plural forms declaration for the locale.
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350
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351 >>> Catalog(locale='en').plural_forms
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352 'nplurals=2; plural=(n != 1)'
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353 >>> Catalog(locale='pt_BR').plural_forms
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354 'nplurals=2; plural=(n > 1)'
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355
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356 :type: `str`
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357 """)
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358
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359 def __contains__(self, id):
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360 """Return whether the catalog has a message with the specified ID."""
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361 return self._key_for(id) in self._messages
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362
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363 def __len__(self):
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364 """The number of messages in the catalog.
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365
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366 This does not include the special ``msgid ""`` entry.
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367 """
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368 return len(self._messages)
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369
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370 def __iter__(self):
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371 """Iterates through all the entries in the catalog, in the order they
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372 were added, yielding a `Message` object for every entry.
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373
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374 :rtype: ``iterator``
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375 """
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376 buf = []
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377 for name, value in self.mime_headers:
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378 buf.append('%s: %s' % (name, value))
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379 yield Message('', '\n'.join(buf), flags=set(['fuzzy']))
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380 for key in self._messages:
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381 yield self._messages[key]
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382
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383 def __repr__(self):
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384 locale = ''
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385 if self.locale:
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386 locale = ' %s' % self.locale
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387 return '<%s %r%s>' % (type(self).__name__, self.domain, locale)
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388
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389 def __delitem__(self, id):
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390 """Delete the message with the specified ID."""
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391 key = self._key_for(id)
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392 if key in self._messages:
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393 del self._messages[key]
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394
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395 def __getitem__(self, id):
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396 """Return the message with the specified ID.
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397
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398 :param id: the message ID
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399 :return: the message with the specified ID, or `None` if no such message
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400 is in the catalog
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401 :rtype: `Message`
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402 """
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403 return self._messages.get(self._key_for(id))
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404
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405 def __setitem__(self, id, message):
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406 """Add or update the message with the specified ID.
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407
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408 >>> catalog = Catalog()
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409 >>> catalog[u'foo'] = Message(u'foo')
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410 >>> catalog[u'foo']
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411 <Message u'foo'>
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412
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413 If a message with that ID is already in the catalog, it is updated
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414 to include the locations and flags of the new message.
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415
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416 >>> catalog = Catalog()
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417 >>> catalog[u'foo'] = Message(u'foo', locations=[('main.py', 1)])
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418 >>> catalog[u'foo'].locations
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419 [('main.py', 1)]
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420 >>> catalog[u'foo'] = Message(u'foo', locations=[('utils.py', 5)])
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421 >>> catalog[u'foo'].locations
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422 [('main.py', 1), ('utils.py', 5)]
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423
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424 :param id: the message ID
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425 :param message: the `Message` object
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426 """
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427 assert isinstance(message, Message), 'expected a Message object'
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428 key = self._key_for(id)
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429 current = self._messages.get(key)
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430 if current:
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431 if message.pluralizable and not current.pluralizable:
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432 # The new message adds pluralization
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433 current.id = message.id
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434 current.string = message.string
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435 current.locations.extend(message.locations)
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436 current.auto_comments.extend(message.auto_comments)
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437 current.user_comments.extend(message.user_comments)
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438 current.flags |= message.flags
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439 message = current
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440 elif id == '':
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441 # special treatment for the header message
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442 headers = message_from_string(message.string.encode(self.charset))
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443 self.mime_headers = headers.items()
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444 self.header_comment = '\n'.join(['# %s' % comment for comment
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445 in message.user_comments])
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446 else:
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447 if isinstance(id, (list, tuple)):
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448 assert isinstance(message.string, (list, tuple))
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449 self._messages[key] = message
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450
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451 def add(self, id, string=None, locations=(), flags=(), auto_comments=(),
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452 user_comments=()):
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453 """Add or update the message with the specified ID.
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454
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455 >>> catalog = Catalog()
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456 >>> catalog.add(u'foo')
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457 >>> catalog[u'foo']
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458 <Message u'foo'>
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459
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460 This method simply constructs a `Message` object with the given
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461 arguments and invokes `__setitem__` with that object.
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462
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463 :param id: the message ID, or a ``(singular, plural)`` tuple for
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464 pluralizable messages
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465 :param string: the translated message string, or a
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466 ``(singular, plural)`` tuple for pluralizable messages
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467 :param locations: a sequence of ``(filenname, lineno)`` tuples
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468 :param flags: a set or sequence of flags
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469 :param auto_comments: a sequence of automatic comments
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470 :param user_comments: a sequence of user comments
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471 """
107
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472 self[id] = Message(id, string, list(locations), flags, auto_comments,
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473 user_comments)
71
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474
167
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475 def update(self, template, fuzzy_matching=True):
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476 """Update the catalog based on the given template catalog.
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477
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478 >>> from babel.messages import Catalog
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479 >>> template = Catalog()
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480 >>> template.add('blue', locations=[('main.py', 100)])
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481 >>> template.add(('salad', 'salads'), locations=[('util.py', 42)])
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482 >>> catalog = Catalog(locale='de_DE')
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483 >>> catalog.add('blue', u'blau', locations=[('main.py', 98)])
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484 >>> catalog.add('head', u'Kopf', locations=[('util.py', 33)])
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485 >>> catalog.add(('salad', 'salads'), (u'Salat', u'Salate'),
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486 ... locations=[('util.py', 38)])
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487
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488 >>> rest = catalog.update(template)
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489 >>> len(catalog)
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490 2
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491
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492 >>> msg1 = catalog['blue']
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493 >>> msg1.string
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494 u'blau'
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495 >>> msg1.locations
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496 [('main.py', 100)]
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497
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498 >>> msg2 = catalog['salad']
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499 >>> msg2.string
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500 (u'Salat', u'Salate')
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501 >>> msg2.locations
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502 [('util.py', 42)]
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503
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504 >>> 'head' in catalog
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505 False
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506 >>> rest
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507 [<Message 'head'>]
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508
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509 :param template: the reference catalog, usually read from a POT file
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510 :param fuzzy_matching: whether to use fuzzy matching of message IDs
165
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511 :return: a list of `Message` objects that the catalog contained before
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512 the updated, but couldn't be found in the template
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513 """
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514 messages = self._messages
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515 self._messages = odict()
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516
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517 for message in template:
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518 if message.id:
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519 key = self._key_for(message.id)
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520 if key in messages:
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521 oldmsg = messages.pop(key)
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522 message.string = oldmsg.string
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523 message.flags |= oldmsg.flags
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524 self[message.id] = message
167
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525
165
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526 else:
167
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527 if fuzzy_matching:
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528 # do some fuzzy matching with difflib
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529 matches = get_close_matches(key.lower().strip(),
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530 [self._key_for(msgid) for msgid in messages], 1)
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531 if matches:
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532 oldmsg = messages.pop(matches[0])
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533 message.string = oldmsg.string
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534 message.flags |= oldmsg.flags | set([u'fuzzy'])
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535 self[message.id] = message
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536 continue
165
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537
167
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538 self[message.id] = message
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539
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540 return messages.values()
165
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541
71
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542 def _key_for(self, id):
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543 """The key for a message is just the singular ID even for pluralizable
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diff changeset
544 messages.
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545 """
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546 key = id
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547 if isinstance(key, (list, tuple)):
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548 key = id[0]
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549 return key
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