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catalog.py
""" babel.messages.catalog ~~~~~~~~~~~~~~~~~~~~~~ Data structures for message catalogs. :copyright: (c) 2013-2022 by the Babel Team. :license: BSD, see LICENSE for more details. """ import re from cgi import parse_header from collections import OrderedDict from datetime import datetime, time as time_ from difflib import get_close_matches from email import message_from_string from copy import copy from babel import __version__ as VERSION from babel.core import Locale, UnknownLocaleError from babel.dates import format_datetime from babel.messages.plurals import get_plural from babel.util import distinct, LOCALTZ, FixedOffsetTimezone, _cmp __all__ = ['Message', 'Catalog', 'TranslationError'] PYTHON_FORMAT = re.compile(r''' \% (?:\(([\w]*)\))? ( [-#0\ +]?(?:\*|[\d]+)? (?:\.(?:\*|[\d]+))? [hlL]? ) ([diouxXeEfFgGcrs%]) ''', re.VERBOSE) def _parse_datetime_header(value): match = re.match(r'^(?P<datetime>.*?)(?P<tzoffset>[+-]\d{4})?$', value) dt = datetime.strptime(match.group('datetime'), '%Y-%m-%d %H:%M') # Separate the offset into a sign component, hours, and # minutes tzoffset = match.group('tzoffset') if tzoffset is not None: plus_minus_s, rest = tzoffset[0], tzoffset[1:] hours_offset_s, mins_offset_s = rest[:2], rest[2:] # Make them all integers plus_minus = int(plus_minus_s + '1') hours_offset = int(hours_offset_s) mins_offset = int(mins_offset_s) # Calculate net offset net_mins_offset = hours_offset * 60 net_mins_offset += mins_offset net_mins_offset *= plus_minus # Create an offset object tzoffset = FixedOffsetTimezone(net_mins_offset) # Store the offset in a datetime object dt = dt.replace(tzinfo=tzoffset) return dt class Message: """Representation of a single message in a catalog.""" def __init__(self, id, string=u'', locations=(), flags=(), auto_comments=(), user_comments=(), previous_id=(), lineno=None, context=None): """Create the message object. :param id: the message ID, or a ``(singular, plural)`` tuple for pluralizable messages :param string: the translated message string, or a ``(singular, plural)`` tuple for pluralizable messages :param locations: a sequence of ``(filename, lineno)`` tuples :param flags: a set or sequence of flags :param auto_comments: a sequence of automatic comments for the message :param user_comments: a sequence of user comments for the message :param previous_id: the previous message ID, or a ``(singular, plural)`` tuple for pluralizable messages :param lineno: the line number on which the msgid line was found in the PO file, if any :param context: the message context """ self.id = id if not string and self.pluralizable: string = (u'', u'') self.string = string self.locations = list(distinct(locations)) self.flags = set(flags) if id and self.python_format: self.flags.add('python-format') else: self.flags.discard('python-format') self.auto_comments = list(distinct(auto_comments)) self.user_comments = list(distinct(user_comments)) if isinstance(previous_id, str): self.previous_id = [previous_id] else: self.previous_id = list(previous_id) self.lineno = lineno self.context = context def __repr__(self): return '<%s %r (flags: %r)>' % (type(self).__name__, self.id, list(self.flags)) def __cmp__(self, other): """Compare Messages, taking into account plural ids""" def values_to_compare(obj): if isinstance(obj, Message) and obj.pluralizable: return obj.id[0], obj.context or '' return obj.id, obj.context or '' return _cmp(values_to_compare(self), values_to_compare(other)) def __gt__(self, other): return self.__cmp__(other) > 0 def __lt__(self, other): return self.__cmp__(other) < 0 def __ge__(self, other): return self.__cmp__(other) >= 0 def __le__(self, other): return self.__cmp__(other) <= 0 def __eq__(self, other): return self.__cmp__(other) == 0 def __ne__(self, other): return self.__cmp__(other) != 0 def is_identical(self, other): """Checks whether messages are identical, taking into account all properties. """ assert isinstance(other, Message) return self.__dict__ == other.__dict__ def clone(self): return Message(*map(copy, (self.id, self.string, self.locations, self.flags, self.auto_comments, self.user_comments, self.previous_id, self.lineno, self.context))) def check(self, catalog=None): """Run various validation checks on the message. Some validations are only performed if the catalog is provided. This method returns a sequence of `TranslationError` objects. :rtype: ``iterator`` :param catalog: A catalog instance that is passed to the checkers :see: `Catalog.check` for a way to perform checks for all messages in a catalog. """ from babel.messages.checkers import checkers errors = [] for checker in checkers: try: checker(catalog, self) except TranslationError as e: errors.append(e) return errors @property def fuzzy(self): """Whether the translation is fuzzy. >>> Message('foo').fuzzy False >>> msg = Message('foo', 'foo', flags=['fuzzy']) >>> msg.fuzzy True >>> msg <Message 'foo' (flags: ['fuzzy'])> :type: `bool`""" return 'fuzzy' in self.flags @property def pluralizable(self): """Whether the message is plurizable. >>> Message('foo').pluralizable False >>> Message(('foo', 'bar')).pluralizable True :type: `bool`""" return isinstance(self.id, (list, tuple)) @property def python_format(self): """Whether the message contains Python-style parameters. >>> Message('foo %(name)s bar').python_format True >>> Message(('foo %(name)s', 'foo %(name)s')).python_format True :type: `bool`""" ids = self.id if not isinstance(ids, (list, tuple)): ids = [ids] return any(PYTHON_FORMAT.search(id) for id in ids) class TranslationError(Exception): """Exception thrown by translation checkers when invalid message translations are encountered.""" DEFAULT_HEADER = u"""\ # Translations template for PROJECT. # Copyright (C) YEAR ORGANIZATION # This file is distributed under the same license as the PROJECT project. # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR. #""" class Catalog: """Representation of a message catalog.""" def __init__(self, locale=None, domain=None, header_comment=DEFAULT_HEADER, project=None, version=None, copyright_holder=None, msgid_bugs_address=None, creation_date=None, revision_date=None, last_translator=None, language_team=None, charset=None, fuzzy=True): """Initialize the catalog object. :param locale: the locale identifier or `Locale` object, or `None` if the catalog is not bound to a locale (which basically means it's a template) :param domain: the message domain :param header_comment: the header comment as string, or `None` for the default header :param project: the project's name :param version: the project's version :param copyright_holder: the copyright holder of the catalog :param msgid_bugs_address: the email address or URL to submit bug reports to :param creation_date: the date the catalog was created :param revision_date: the date the catalog was revised :param last_translator: the name and email of the last translator :param language_team: the name and email of the language team :param charset: the encoding to use in the output (defaults to utf-8) :param fuzzy: the fuzzy bit on the catalog header """ self.domain = domain self.locale = locale self._header_comment = header_comment self._messages = OrderedDict() self.project = project or 'PROJECT' self.version = version or 'VERSION' self.copyright_holder = copyright_holder or 'ORGANIZATION' self.msgid_bugs_address = msgid_bugs_address or 'EMAIL@ADDRESS' self.last_translator = last_translator or 'FULL NAME <EMAIL@ADDRESS>' """Name and email address of the last translator.""" self.language_team = language_team or 'LANGUAGE <LL@li.org>' """Name and email address of the language team.""" self.charset = charset or 'utf-8' if creation_date is None: creation_date = datetime.now(LOCALTZ) elif isinstance(creation_date, datetime) and not creation_date.tzinfo: creation_date = creation_date.replace(tzinfo=LOCALTZ) self.creation_date = creation_date if revision_date is None: revision_date = 'YEAR-MO-DA HO:MI+ZONE' elif isinstance(revision_date, datetime) and not revision_date.tzinfo: revision_date = revision_date.replace(tzinfo=LOCALTZ) self.revision_date = revision_date self.fuzzy = fuzzy self.obsolete = OrderedDict() # Dictionary of obsolete messages self._num_plurals = None self._plural_expr = None def _set_locale(self, locale): if locale is None: self._locale_identifier = None self._locale = None return if isinstance(locale, Locale): self._locale_identifier = str(locale) self._locale = locale return if isinstance(locale, str): self._locale_identifier = str(locale) try: self._locale = Locale.parse(locale) except UnknownLocaleError: self._locale = None return raise TypeError('`locale` must be a Locale, a locale identifier string, or None; got %r' % locale) def _get_locale(self): return self._locale def _get_locale_identifier(self): return self._locale_identifier locale = property(_get_locale, _set_locale) locale_identifier = property(_get_locale_identifier) def _get_header_comment(self): comment = self._header_comment year = datetime.now(LOCALTZ).strftime('%Y') if hasattr(self.revision_date, 'strftime'): year = self.revision_date.strftime('%Y') comment = comment.replace('PROJECT', self.project) \ .replace('VERSION', self.version) \ .replace('YEAR', year) \ .replace('ORGANIZATION', self.copyright_holder) locale_name = (self.locale.english_name if self.locale else self.locale_identifier) if locale_name: comment = comment.replace('Translations template', '%s translations' % locale_name) return comment def _set_header_comment(self, string): self._header_comment = string header_comment = property(_get_header_comment, _set_header_comment, doc="""\ The header comment for the catalog. >>> catalog = Catalog(project='Foobar', version='1.0', ... copyright_holder='Foo Company') >>> print(catalog.header_comment) #doctest: +ELLIPSIS # Translations template for Foobar. # Copyright (C) ... Foo Company # This file is distributed under the same license as the Foobar project. # FIRST AUTHOR <EMAIL@ADDRESS>, .... # The header can also be set from a string. Any known upper-case variables will be replaced when the header is retrieved again: >>> catalog = Catalog(project='Foobar', version='1.0', ... copyright_holder='Foo Company') >>> catalog.header_comment = '''\\ ... # The POT for my really cool PROJECT project. ... # Copyright (C) 1990-2003 ORGANIZATION ... # This file is distributed under the same license as the PROJECT ... # project. ... #''' >>> print(catalog.header_comment) # The POT for my really cool Foobar project. # Copyright (C) 1990-2003 Foo Company # This file is distributed under the same license as the Foobar # project. # :type: `unicode` """) def _get_mime_headers(self): headers = [] headers.append(('Project-Id-Version', '%s %s' % (self.project, self.version))) headers.append(('Report-Msgid-Bugs-To', self.msgid_bugs_address)) headers.append(('POT-Creation-Date', format_datetime(self.creation_date, 'yyyy-MM-dd HH:mmZ', locale='en'))) if isinstance(self.revision_date, (datetime, time_, int, float)): headers.append(('PO-Revision-Date', format_datetime(self.revision_date, 'yyyy-MM-dd HH:mmZ', locale='en'))) else: headers.append(('PO-Revision-Date', self.revision_date)) headers.append(('Last-Translator', self.last_translator)) if self.locale_identifier: headers.append(('Language', str(self.locale_identifier))) if self.locale_identifier and ('LANGUAGE' in self.language_team): headers.append(('Language-Team', self.language_team.replace('LANGUAGE', str(self.locale_identifier)))) else: headers.append(('Language-Team', self.language_team)) if self.locale is not None: headers.append(('Plural-Forms', self.plural_forms)) headers.append(('MIME-Version', '1.0')) headers.append(('Content-Type', 'text/plain; charset=%s' % self.charset)) headers.append(('Content-Transfer-Encoding', '8bit')) headers.append(('Generated-By', 'Babel %s\n' % VERSION)) return headers def _force_text(self, s, encoding='utf-8', errors='strict'): if isinstance(s, str): return s if isinstance(s, bytes): return s.decode(encoding, errors) return str(s) def _set_mime_headers(self, headers): for name, value in headers: name = self._force_text(name.lower(), encoding=self.charset) value = self._force_text(value, encoding=self.charset) if name == 'project-id-version': parts = value.split(' ') self.project = u' '.join(parts[:-1]) self.version = parts[-1] elif name == 'report-msgid-bugs-to': self.msgid_bugs_address = value elif name == 'last-translator': self.last_translator = value elif name == 'language': value = value.replace('-', '_') self._set_locale(value) elif name == 'language-team': self.language_team = value elif name == 'content-type': mimetype, params = parse_header(value) if 'charset' in params: self.charset = params['charset'].lower() elif name == 'plural-forms': _, params = parse_header(' ;' + value) self._num_plurals = int(params.get('nplurals', 2)) self._plural_expr = params.get('plural', '(n != 1)') elif name == 'pot-creation-date': self.creation_date = _parse_datetime_header(value) elif name == 'po-revision-date': # Keep the value if it's not the default one if 'YEAR' not in value: self.revision_date = _parse_datetime_header(value) mime_headers = property(_get_mime_headers, _set_mime_headers, doc="""\ The MIME headers of the catalog, used for the special ``msgid ""`` entry. The behavior of this property changes slightly depending on whether a locale is set or not, the latter indicating that the catalog is actually a template for actual translations. Here's an example of the output for such a catalog template: >>> from babel.dates import UTC >>> created = datetime(1990, 4, 1, 15, 30, tzinfo=UTC) >>> catalog = Catalog(project='Foobar', version='1.0', ... creation_date=created) >>> for name, value in catalog.mime_headers: ... print('%s: %s' % (name, value)) Project-Id-Version: Foobar 1.0 Report-Msgid-Bugs-To: EMAIL@ADDRESS POT-Creation-Date: 1990-04-01 15:30+0000 PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE Last-Translator: FULL NAME <EMAIL@ADDRESS> Language-Team: LANGUAGE <LL@li.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Generated-By: Babel ... And here's an example of the output when the locale is set: >>> revised = datetime(1990, 8, 3, 12, 0, tzinfo=UTC) >>> catalog = Catalog(locale='de_DE', project='Foobar', version='1.0', ... creation_date=created, revision_date=revised, ... last_translator='John Doe <jd@example.com>', ... language_team='de_DE <de@example.com>') >>> for name, value in catalog.mime_headers: ... print('%s: %s' % (name, value)) Project-Id-Version: Foobar 1.0 Report-Msgid-Bugs-To: EMAIL@ADDRESS POT-Creation-Date: 1990-04-01 15:30+0000 PO-Revision-Date: 1990-08-03 12:00+0000 Last-Translator: John Doe <jd@example.com> Language: de_DE Language-Team: de_DE <de@example.com> Plural-Forms: nplurals=2; plural=(n != 1); MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Generated-By: Babel ... :type: `list` """) @property def num_plurals(self): """The number of plurals used by the catalog or locale. >>> Catalog(locale='en').num_plurals 2 >>> Catalog(locale='ga').num_plurals 5 :type: `int`""" if self._num_plurals is None: num = 2 if self.locale: num = get_plural(self.locale)[0] self._num_plurals = num return self._num_plurals @property def plural_expr(self): """The plural expression used by the catalog or locale. >>> Catalog(locale='en').plural_expr '(n != 1)' >>> Catalog(locale='ga').plural_expr '(n==1 ? 0 : n==2 ? 1 : n>=3 && n<=6 ? 2 : n>=7 && n<=10 ? 3 : 4)' >>> Catalog(locale='ding').plural_expr # unknown locale '(n != 1)' :type: `str`""" if self._plural_expr is None: expr = '(n != 1)' if self.locale: expr = get_plural(self.locale)[1] self._plural_expr = expr return self._plural_expr @property def plural_forms(self): """Return the plural forms declaration for the locale. >>> Catalog(locale='en').plural_forms 'nplurals=2; plural=(n != 1);' >>> Catalog(locale='pt_BR').plural_forms 'nplurals=2; plural=(n > 1);' :type: `str`""" return 'nplurals=%s; plural=%s;' % (self.num_plurals, self.plural_expr) def __contains__(self, id): """Return whether the catalog has a message with the specified ID.""" return self._key_for(id) in self._messages def __len__(self): """The number of messages in the catalog. This does not include the special ``msgid ""`` entry.""" return len(self._messages) def __iter__(self): """Iterates through all the entries in the catalog, in the order they were added, yielding a `Message` object for every entry. :rtype: ``iterator``""" buf = [] for name, value in self.mime_headers: buf.append('%s: %s' % (name, value)) flags = set() if self.fuzzy: flags |= {'fuzzy'} yield Message(u'', '\n'.join(buf), flags=flags) for key in self._messages: yield self._messages[key] def __repr__(self): locale = '' if self.locale: locale = ' %s' % self.locale return '<%s %r%s>' % (type(self).__name__, self.domain, locale) def __delitem__(self, id): """Delete the message with the specified ID.""" self.delete(id) def __getitem__(self, id): """Return the message with the specified ID. :param id: the message ID """ return self.get(id) def __setitem__(self, id, message): """Add or update the message with the specified ID. >>> catalog = Catalog() >>> catalog[u'foo'] = Message(u'foo') >>> catalog[u'foo'] <Message u'foo' (flags: [])> If a message with that ID is already in the catalog, it is updated to include the locations and flags of the new message. >>> catalog = Catalog() >>> catalog[u'foo'] = Message(u'foo', locations=[('main.py', 1)]) >>> catalog[u'foo'].locations [('main.py', 1)] >>> catalog[u'foo'] = Message(u'foo', locations=[('utils.py', 5)]) >>> catalog[u'foo'].locations [('main.py', 1), ('utils.py', 5)] :param id: the message ID :param message: the `Message` object """ assert isinstance(message, Message), 'expected a Message object' key = self._key_for(id, message.context) current = self._messages.get(key) if current: if message.pluralizable and not current.pluralizable: # The new message adds pluralization current.id = message.id current.string = message.string current.locations = list(distinct(current.locations + message.locations)) current.auto_comments = list(distinct(current.auto_comments + message.auto_comments)) current.user_comments = list(distinct(current.user_comments + message.user_comments)) current.flags |= message.flags message = current elif id == '': # special treatment for the header message self.mime_headers = message_from_string(message.string).items() self.header_comment = '\n'.join([('# %s' % c).rstrip() for c in message.user_comments]) self.fuzzy = message.fuzzy else: if isinstance(id, (list, tuple)): assert isinstance(message.string, (list, tuple)), \ 'Expected sequence but got %s' % type(message.string) self._messages[key] = message def add(self, id, string=None, locations=(), flags=(), auto_comments=(), user_comments=(), previous_id=(), lineno=None, context=None): """Add or update the message with the specified ID. >>> catalog = Catalog() >>> catalog.add(u'foo') <Message ...> >>> catalog[u'foo'] <Message u'foo' (flags: [])> This method simply constructs a `Message` object with the given arguments and invokes `__setitem__` with that object. :param id: the message ID, or a ``(singular, plural)`` tuple for pluralizable messages :param string: the translated message string, or a ``(singular, plural)`` tuple for pluralizable messages :param locations: a sequence of ``(filename, lineno)`` tuples :param flags: a set or sequence of flags :param auto_comments: a sequence of automatic comments :param user_comments: a sequence of user comments :param previous_id: the previous message ID, or a ``(singular, plural)`` tuple for pluralizable messages :param lineno: the line number on which the msgid line was found in the PO file, if any :param context: the message context """ message = Message(id, string, list(locations), flags, auto_comments, user_comments, previous_id, lineno=lineno, context=context) self[id] = message return message def check(self): """Run various validation checks on the translations in the catalog. For every message which fails validation, this method yield a ``(message, errors)`` tuple, where ``message`` is the `Message` object and ``errors`` is a sequence of `TranslationError` objects. :rtype: ``iterator`` """ for message in self._messages.values(): errors = message.check(catalog=self) if errors: yield message, errors def get(self, id, context=None): """Return the message with the specified ID and context. :param id: the message ID :param context: the message context, or ``None`` for no context """ return self._messages.get(self._key_for(id, context)) def delete(self, id, context=None): """Delete the message with the specified ID and context. :param id: the message ID :param context: the message context, or ``None`` for no context """ key = self._key_for(id, context) if key in self._messages: del self._messages[key] def update(self, template, no_fuzzy_matching=False, update_header_comment=False, keep_user_comments=True): """Update the catalog based on the given template catalog. >>> from babel.messages import Catalog >>> template = Catalog() >>> template.add('green', locations=[('main.py', 99)]) <Message ...> >>> template.add('blue', locations=[('main.py', 100)]) <Message ...> >>> template.add(('salad', 'salads'), locations=[('util.py', 42)]) <Message ...> >>> catalog = Catalog(locale='de_DE') >>> catalog.add('blue', u'blau', locations=[('main.py', 98)]) <Message ...> >>> catalog.add('head', u'Kopf', locations=[('util.py', 33)]) <Message ...> >>> catalog.add(('salad', 'salads'), (u'Salat', u'Salate'), ... locations=[('util.py', 38)]) <Message ...> >>> catalog.update(template) >>> len(catalog) 3 >>> msg1 = catalog['green'] >>> msg1.string >>> msg1.locations [('main.py', 99)] >>> msg2 = catalog['blue'] >>> msg2.string u'blau' >>> msg2.locations [('main.py', 100)] >>> msg3 = catalog['salad'] >>> msg3.string (u'Salat', u'Salate') >>> msg3.locations [('util.py', 42)] Messages that are in the catalog but not in the template are removed from the main collection, but can still be accessed via the `obsolete` member: >>> 'head' in catalog False >>> list(catalog.obsolete.values()) [<Message 'head' (flags: [])>] :param template: the reference catalog, usually read from a POT file :param no_fuzzy_matching: whether to use fuzzy matching of message IDs """ messages = self._messages remaining = messages.copy() self._messages = OrderedDict() # Prepare for fuzzy matching fuzzy_candidates = [] if not no_fuzzy_matching: fuzzy_candidates = { self._key_for(msgid): messages[msgid].context for msgid in messages if msgid and messages[msgid].string } fuzzy_matches = set() def _merge(message, oldkey, newkey): message = message.clone() fuzzy = False if oldkey != newkey: fuzzy = True fuzzy_matches.add(oldkey) oldmsg = messages.get(oldkey) if isinstance(oldmsg.id, str): message.previous_id = [oldmsg.id] else: message.previous_id = list(oldmsg.id) else: oldmsg = remaining.pop(oldkey, None) message.string = oldmsg.string if keep_user_comments: message.user_comments = list(distinct(oldmsg.user_comments)) if isinstance(message.id, (list, tuple)): if not isinstance(message.string, (list, tuple)): fuzzy = True message.string = tuple( [message.string] + ([u''] * (len(message.id) - 1)) ) elif len(message.string) != self.num_plurals: fuzzy = True message.string = tuple(message.string[:len(oldmsg.string)]) elif isinstance(message.string, (list, tuple)): fuzzy = True message.string = message.string[0] message.flags |= oldmsg.flags if fuzzy: message.flags |= {u'fuzzy'} self[message.id] = message for message in template: if message.id: key = self._key_for(message.id, message.context) if key in messages: _merge(message, key, key) else: if not no_fuzzy_matching: # do some fuzzy matching with difflib if isinstance(key, tuple): matchkey = key[0] # just the msgid, no context else: matchkey = key matches = get_close_matches(matchkey.lower().strip(), fuzzy_candidates.keys(), 1) if matches: newkey = matches[0] newctxt = fuzzy_candidates[newkey] if newctxt is not None: newkey = newkey, newctxt _merge(message, newkey, key) continue self[message.id] = message for msgid in remaining: if no_fuzzy_matching or msgid not in fuzzy_matches: self.obsolete[msgid] = remaining[msgid] if update_header_comment: # Allow the updated catalog's header to be rewritten based on the # template's header self.header_comment = template.header_comment # Make updated catalog's POT-Creation-Date equal to the template # used to update the catalog self.creation_date = template.creation_date def _key_for(self, id, context=None): """The key for a message is just the singular ID even for pluralizable messages, but is a ``(msgid, msgctxt)`` tuple for context-specific messages. """ key = id if isinstance(key, (list, tuple)): key = id[0] if context is not None: key = (key, context) return key def is_identical(self, other): """Checks if catalogs are identical, taking into account messages and headers. """ assert isinstance(other, Catalog) for key in self._messages.keys() | other._messages.keys(): message_1 = self.get(key) message_2 = other.get(key) if ( message_1 is None or message_2 is None or not message_1.is_identical(message_2) ): return False return dict(self.mime_headers) == dict(other.mime_headers)
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