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475 lines
16 KiB
Python
475 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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"""
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babel.messages.pofile
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~~~~~~~~~~~~~~~~~~~~~
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Reading and writing of files in the ``gettext`` PO (portable object)
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format.
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:copyright: (c) 2013 by the Babel Team.
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:license: BSD, see LICENSE for more details.
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"""
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import os
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import re
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from babel.messages.catalog import Catalog, Message
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from babel.util import wraptext
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from babel._compat import text_type
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def unescape(string):
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r"""Reverse `escape` the given string.
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>>> print unescape('"Say:\\n \\"hello, world!\\"\\n"')
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Say:
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"hello, world!"
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<BLANKLINE>
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:param string: the string to unescape
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"""
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def replace_escapes(match):
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m = match.group(1)
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if m == 'n':
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return '\n'
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elif m == 't':
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return '\t'
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elif m == 'r':
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return '\r'
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# m is \ or "
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return m
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return re.compile(r'\\([\\trn"])').sub(replace_escapes, string[1:-1])
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def denormalize(string):
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r"""Reverse the normalization done by the `normalize` function.
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>>> print denormalize(r'''""
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... "Say:\n"
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... " \"hello, world!\"\n"''')
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Say:
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"hello, world!"
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<BLANKLINE>
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>>> print denormalize(r'''""
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... "Say:\n"
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... " \"Lorem ipsum dolor sit "
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... "amet, consectetur adipisicing"
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... " elit, \"\n"''')
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Say:
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"Lorem ipsum dolor sit amet, consectetur adipisicing elit, "
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<BLANKLINE>
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:param string: the string to denormalize
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"""
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if '\n' in string:
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escaped_lines = string.splitlines()
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if string.startswith('""'):
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escaped_lines = escaped_lines[1:]
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lines = map(unescape, escaped_lines)
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return ''.join(lines)
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else:
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return unescape(string)
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def read_po(fileobj, locale=None, domain=None, ignore_obsolete=False, charset=None):
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"""Read messages from a ``gettext`` PO (portable object) file from the given
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file-like object and return a `Catalog`.
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>>> from datetime import datetime
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>>> from StringIO import StringIO
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>>> buf = StringIO('''
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... #: main.py:1
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... #, fuzzy, python-format
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... msgid "foo %(name)s"
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... msgstr "quux %(name)s"
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...
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... # A user comment
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... #. An auto comment
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... #: main.py:3
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... msgid "bar"
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... msgid_plural "baz"
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... msgstr[0] "bar"
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... msgstr[1] "baaz"
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... ''')
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>>> catalog = read_po(buf)
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>>> catalog.revision_date = datetime(2007, 04, 01)
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>>> for message in catalog:
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... if message.id:
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... print (message.id, message.string)
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... print ' ', (message.locations, message.flags)
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... print ' ', (message.user_comments, message.auto_comments)
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(u'foo %(name)s', u'quux %(name)s')
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([(u'main.py', 1)], set([u'fuzzy', u'python-format']))
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([], [])
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((u'bar', u'baz'), (u'bar', u'baaz'))
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([(u'main.py', 3)], set([]))
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([u'A user comment'], [u'An auto comment'])
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.. versionadded:: 1.0
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Added support for explicit charset argument.
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:param fileobj: the file-like object to read the PO file from
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:param locale: the locale identifier or `Locale` object, or `None`
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if the catalog is not bound to a locale (which basically
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means it's a template)
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:param domain: the message domain
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:param ignore_obsolete: whether to ignore obsolete messages in the input
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:param charset: the character set of the catalog.
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"""
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catalog = Catalog(locale=locale, domain=domain, charset=charset)
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counter = [0]
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offset = [0]
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messages = []
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translations = []
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locations = []
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flags = []
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user_comments = []
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auto_comments = []
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obsolete = [False]
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context = []
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in_msgid = [False]
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in_msgstr = [False]
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in_msgctxt = [False]
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def _add_message():
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translations.sort()
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if len(messages) > 1:
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msgid = tuple([denormalize(m) for m in messages])
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else:
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msgid = denormalize(messages[0])
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if isinstance(msgid, (list, tuple)):
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string = []
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for idx in range(catalog.num_plurals):
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try:
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string.append(translations[idx])
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except IndexError:
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string.append((idx, ''))
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string = tuple([denormalize(t[1]) for t in string])
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else:
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string = denormalize(translations[0][1])
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if context:
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msgctxt = denormalize('\n'.join(context))
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else:
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msgctxt = None
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message = Message(msgid, string, list(locations), set(flags),
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auto_comments, user_comments, lineno=offset[0] + 1,
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context=msgctxt)
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if obsolete[0]:
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if not ignore_obsolete:
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catalog.obsolete[msgid] = message
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else:
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catalog[msgid] = message
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del messages[:]; del translations[:]; del context[:]; del locations[:];
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del flags[:]; del auto_comments[:]; del user_comments[:];
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obsolete[0] = False
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counter[0] += 1
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def _process_message_line(lineno, line):
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if line.startswith('msgid_plural'):
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in_msgid[0] = True
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msg = line[12:].lstrip()
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messages.append(msg)
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elif line.startswith('msgid'):
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in_msgid[0] = True
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offset[0] = lineno
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txt = line[5:].lstrip()
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if messages:
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_add_message()
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messages.append(txt)
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elif line.startswith('msgstr'):
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in_msgid[0] = False
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in_msgstr[0] = True
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msg = line[6:].lstrip()
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if msg.startswith('['):
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idx, msg = msg[1:].split(']', 1)
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translations.append([int(idx), msg.lstrip()])
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else:
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translations.append([0, msg])
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elif line.startswith('msgctxt'):
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if messages:
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_add_message()
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in_msgid[0] = in_msgstr[0] = False
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context.append(line[7:].lstrip())
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elif line.startswith('"'):
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if in_msgid[0]:
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messages[-1] += u'\n' + line.rstrip()
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elif in_msgstr[0]:
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translations[-1][1] += u'\n' + line.rstrip()
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elif in_msgctxt[0]:
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context.append(line.rstrip())
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for lineno, line in enumerate(fileobj.readlines()):
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line = line.strip()
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if not isinstance(line, text_type):
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line = line.decode(catalog.charset)
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if line.startswith('#'):
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in_msgid[0] = in_msgstr[0] = False
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if messages and translations:
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_add_message()
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if line[1:].startswith(':'):
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for location in line[2:].lstrip().split():
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pos = location.rfind(':')
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if pos >= 0:
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try:
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lineno = int(location[pos + 1:])
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except ValueError:
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continue
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locations.append((location[:pos], lineno))
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elif line[1:].startswith(','):
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for flag in line[2:].lstrip().split(','):
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flags.append(flag.strip())
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elif line[1:].startswith('~'):
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obsolete[0] = True
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_process_message_line(lineno, line[2:].lstrip())
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elif line[1:].startswith('.'):
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# These are called auto-comments
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comment = line[2:].strip()
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if comment: # Just check that we're not adding empty comments
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auto_comments.append(comment)
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else:
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# These are called user comments
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user_comments.append(line[1:].strip())
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else:
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_process_message_line(lineno, line)
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if messages:
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_add_message()
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# No actual messages found, but there was some info in comments, from which
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# we'll construct an empty header message
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elif not counter[0] and (flags or user_comments or auto_comments):
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messages.append(u'')
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translations.append([0, u''])
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_add_message()
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return catalog
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WORD_SEP = re.compile('('
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r'\s+|' # any whitespace
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r'[^\s\w]*\w+[a-zA-Z]-(?=\w+[a-zA-Z])|' # hyphenated words
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r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w)' # em-dash
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')')
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def escape(string):
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r"""Escape the given string so that it can be included in double-quoted
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strings in ``PO`` files.
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>>> escape('''Say:
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... "hello, world!"
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... ''')
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'"Say:\\n \\"hello, world!\\"\\n"'
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:param string: the string to escape
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"""
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return '"%s"' % string.replace('\\', '\\\\') \
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.replace('\t', '\\t') \
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.replace('\r', '\\r') \
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.replace('\n', '\\n') \
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.replace('\"', '\\"')
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def normalize(string, prefix='', width=76):
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r"""Convert a string into a format that is appropriate for .po files.
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>>> print normalize('''Say:
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... "hello, world!"
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... ''', width=None)
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""
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"Say:\n"
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" \"hello, world!\"\n"
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>>> print normalize('''Say:
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... "Lorem ipsum dolor sit amet, consectetur adipisicing elit, "
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... ''', width=32)
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""
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"Say:\n"
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" \"Lorem ipsum dolor sit "
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"amet, consectetur adipisicing"
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" elit, \"\n"
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:param string: the string to normalize
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:param prefix: a string that should be prepended to every line
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:param width: the maximum line width; use `None`, 0, or a negative number
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to completely disable line wrapping
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"""
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if width and width > 0:
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prefixlen = len(prefix)
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lines = []
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for line in string.splitlines(True):
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if len(escape(line)) + prefixlen > width:
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chunks = WORD_SEP.split(line)
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chunks.reverse()
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while chunks:
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buf = []
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size = 2
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while chunks:
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l = len(escape(chunks[-1])) - 2 + prefixlen
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if size + l < width:
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buf.append(chunks.pop())
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size += l
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else:
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if not buf:
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# handle long chunks by putting them on a
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# separate line
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buf.append(chunks.pop())
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break
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lines.append(u''.join(buf))
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else:
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lines.append(line)
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else:
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lines = string.splitlines(True)
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if len(lines) <= 1:
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return escape(string)
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# Remove empty trailing line
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if lines and not lines[-1]:
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del lines[-1]
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lines[-1] += '\n'
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return u'""\n' + u'\n'.join([(prefix + escape(l)) for l in lines])
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def write_po(fileobj, catalog, width=76, no_location=False, omit_header=False,
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sort_output=False, sort_by_file=False, ignore_obsolete=False,
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include_previous=False):
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r"""Write a ``gettext`` PO (portable object) template file for a given
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message catalog to the provided file-like object.
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>>> catalog = Catalog()
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>>> catalog.add(u'foo %(name)s', locations=[('main.py', 1)],
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... flags=('fuzzy',))
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<Message...>
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>>> catalog.add((u'bar', u'baz'), locations=[('main.py', 3)])
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<Message...>
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>>> from io import BytesIO
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>>> buf = BytesIO()
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>>> write_po(buf, catalog, omit_header=True)
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>>> print buf.getvalue()
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#: main.py:1
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#, fuzzy, python-format
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msgid "foo %(name)s"
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msgstr ""
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<BLANKLINE>
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#: main.py:3
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msgid "bar"
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msgid_plural "baz"
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msgstr[0] ""
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msgstr[1] ""
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<BLANKLINE>
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<BLANKLINE>
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:param fileobj: the file-like object to write to
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:param catalog: the `Catalog` instance
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:param width: the maximum line width for the generated output; use `None`,
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0, or a negative number to completely disable line wrapping
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:param no_location: do not emit a location comment for every message
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:param omit_header: do not include the ``msgid ""`` entry at the top of the
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output
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:param sort_output: whether to sort the messages in the output by msgid
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:param sort_by_file: whether to sort the messages in the output by their
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locations
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:param ignore_obsolete: whether to ignore obsolete messages and not include
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them in the output; by default they are included as
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comments
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:param include_previous: include the old msgid as a comment when
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updating the catalog
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"""
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def _normalize(key, prefix=''):
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return normalize(key, prefix=prefix, width=width)
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def _write(text):
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if isinstance(text, text_type):
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text = text.encode(catalog.charset, 'backslashreplace')
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fileobj.write(text)
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def _write_comment(comment, prefix=''):
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# xgettext always wraps comments even if --no-wrap is passed;
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# provide the same behaviour
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if width and width > 0:
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_width = width
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else:
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_width = 76
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for line in wraptext(comment, _width):
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_write('#%s %s\n' % (prefix, line.strip()))
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def _write_message(message, prefix=''):
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if isinstance(message.id, (list, tuple)):
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if message.context:
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_write('%smsgctxt %s\n' % (prefix,
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_normalize(message.context, prefix)))
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_write('%smsgid %s\n' % (prefix, _normalize(message.id[0], prefix)))
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_write('%smsgid_plural %s\n' % (
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prefix, _normalize(message.id[1], prefix)
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))
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for idx in range(catalog.num_plurals):
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try:
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string = message.string[idx]
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except IndexError:
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string = ''
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_write('%smsgstr[%d] %s\n' % (
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prefix, idx, _normalize(string, prefix)
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))
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else:
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if message.context:
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_write('%smsgctxt %s\n' % (prefix,
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_normalize(message.context, prefix)))
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_write('%smsgid %s\n' % (prefix, _normalize(message.id, prefix)))
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_write('%smsgstr %s\n' % (
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prefix, _normalize(message.string or '', prefix)
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))
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messages = list(catalog)
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if sort_output:
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messages.sort()
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elif sort_by_file:
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messages.sort(lambda x,y: cmp(x.locations, y.locations))
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for message in messages:
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if not message.id: # This is the header "message"
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if omit_header:
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continue
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comment_header = catalog.header_comment
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if width and width > 0:
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lines = []
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for line in comment_header.splitlines():
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lines += wraptext(line, width=width,
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subsequent_indent='# ')
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comment_header = u'\n'.join(lines)
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_write(comment_header + u'\n')
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for comment in message.user_comments:
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_write_comment(comment)
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for comment in message.auto_comments:
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_write_comment(comment, prefix='.')
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if not no_location:
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locs = u' '.join([u'%s:%d' % (filename.replace(os.sep, '/'), lineno)
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for filename, lineno in message.locations])
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_write_comment(locs, prefix=':')
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if message.flags:
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_write('#%s\n' % ', '.join([''] + sorted(message.flags)))
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if message.previous_id and include_previous:
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_write_comment('msgid %s' % _normalize(message.previous_id[0]),
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prefix='|')
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if len(message.previous_id) > 1:
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_write_comment('msgid_plural %s' % _normalize(
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message.previous_id[1]
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), prefix='|')
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_write_message(message)
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_write('\n')
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if not ignore_obsolete:
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for message in catalog.obsolete.values():
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for comment in message.user_comments:
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_write_comment(comment)
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_write_message(message, prefix='#~ ')
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_write('\n')
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