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#
# License: MIT (see LICENSE file provided)
# vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4:
"""
**polib** allows you to manipulate, create, modify gettext files (pot, po and
mo files). You can load existing files, iterate through it's entries, add,
modify entries, comments or metadata, etc. or create new po files from scratch.
**polib** provides a simple and pythonic API via the :func:`~polib.pofile` and
:func:`~polib.mofile` convenience functions.
__author__ = 'David Jean Louis <izimobil@gmail.com>'
__version__ = '0.6.4'
__all__ = ['pofile', 'POFile', 'POEntry', 'mofile', 'MOFile', 'MOEntry',
'detect_encoding', 'escape', 'unescape', 'detect_encoding',]
import textwrap
import types
# the default encoding to use when encoding cannot be detected
def _pofile_or_mofile(f, type, **kwargs):
"""
Internal function used by :func:`polib.pofile` and :func:`polib.mofile` to
honor the DRY concept.
# get the file encoding
enc = kwargs.get('encoding')
if enc is None:
enc = detect_encoding(f, type == 'mofile')
# parse the file
kls = type == 'pofile' and _POFileParser or _MOFileParser
parser = kls(
f,
encoding=enc,
check_for_duplicates=kwargs.get('check_for_duplicates', False)
)
instance = parser.parse()
instance.wrapwidth = kwargs.get('wrapwidth', 78)
return instance
# }}}
# function pofile() {{{
def pofile(pofile, **kwargs):
"""
Convenience function that parses the po or pot file ``pofile`` and returns
a :class:`~polib.POFile` instance.
Arguments:
``pofile``
string, full or relative path to the po/pot file or its content (data).
``wrapwidth``
integer, the wrap width, only useful when the ``-w`` option was passed
to xgettext (optional, default: ``78``).
``encoding``
string, the encoding to use (e.g. "utf-8") (default: ``None``, the
encoding will be auto-detected).
``check_for_duplicates``
whether to check for duplicate entries when adding entries to the
file (optional, default: ``False``).
"""
return _pofile_or_mofile(pofile, 'pofile', **kwargs)
# }}}
Convenience function that parses the mo file ``mofile`` and returns a
:class:`~polib.MOFile` instance.
``mofile``
string, full or relative path to the mo file or its content (data).
``wrapwidth``
integer, the wrap width, only useful when the ``-w`` option was passed
to xgettext to generate the po file that was used to format the mo file
(optional, default: ``78``).
``encoding``
string, the encoding to use (e.g. "utf-8") (default: ``None``, the
encoding will be auto-detected).
``check_for_duplicates``
whether to check for duplicate entries when adding entries to the
file (optional, default: ``False``).
return _pofile_or_mofile(mofile, 'mofile', **kwargs)
# }}}
# function detect_encoding() {{{
def detect_encoding(file, binary_mode=False):
Try to detect the encoding used by the ``file``. The ``file`` argument can
be a PO or MO file path or a string containing the contents of the file.
If the encoding cannot be detected, the function will return the value of
``default_encoding``.
Arguments:
``file``
string, full or relative path to the po/mo file or its content.
``binary_mode``
boolean, set this to True if ``file`` is a mo file.
"""
rx = re.compile(r'"?Content-Type:.+? charset=([\w_\-:\.]+)')
def charset_exists(charset):
"""Check whether ``charset`` is valid or not."""
try:
codecs.lookup(charset)
except LookupError:
return False
return True
if not os.path.exists(file):
match = rx.search(file)
if match:
enc = match.group(1).strip()
if charset_exists(enc):
return enc
if binary_mode:
mode = 'rb'
else:
mode = 'r'
f = open(file, mode)
for l in f.readlines():
match = rx.search(l)
if match:
f.close()
enc = match.group(1).strip()
if charset_exists(enc):
return enc
f.close()
return default_encoding
# }}}
# function escape() {{{
def escape(st):
"""
Escapes the characters ``\\\\``, ``\\t``, ``\\n``, ``\\r`` and ``"`` in
the given string ``st`` and returns it.
"""
return st.replace('\\', r'\\')\
.replace('\t', r'\t')\
.replace('\r', r'\r')\
.replace('\n', r'\n')\
.replace('\"', r'\"')
# }}}
# function unescape() {{{
def unescape(st):
"""
Unescapes the characters ``\\\\``, ``\\t``, ``\\n``, ``\\r`` and ``"`` in
the given string ``st`` and returns it.
def unescape_repl(m):
m = m.group(1)
if m == 'n':
return '\n'
if m == 't':
return '\t'
if m == 'r':
return '\r'
if m == '\\':
return '\\'
return m # handles escaped double quote
return re.sub(r'\\(\\|n|t|r|")', unescape_repl, st)
# }}}
# class _BaseFile {{{
class _BaseFile(list):
"""
Common base class for the :class:`~polib.POFile` and :class:`~polib.MOFile`
classes. This class should **not** be instanciated directly.
"""
def __init__(self, *args, **kwargs):
"""
Constructor, accepts the following keyword arguments:
``pofile``
string, the path to the po or mo file, or its content as a string.
``wrapwidth``
integer, the wrap width, only useful when the ``-w`` option was
passed to xgettext (optional, default: ``78``).
``encoding``
string, the encoding to use, defaults to ``default_encoding``
global variable (optional).
``check_for_duplicates``
whether to check for duplicate entries when adding entries to the
file, (optional, default: ``False``).
"""
list.__init__(self)
# the opened file handle
pofile = kwargs.get('pofile', None)
if pofile and os.path.exists(pofile):
self.fpath = pofile
else:
self.fpath = kwargs.get('fpath')
# the width at which lines should be wrapped
self.wrapwidth = kwargs.get('wrapwidth', 78)
# the file encoding
self.encoding = kwargs.get('encoding', default_encoding)
# whether to check for duplicate entries or not
self.check_for_duplicates = kwargs.get('check_for_duplicates', False)
# header
self.header = ''
# both po and mo files have metadata
self.metadata = {}
self.metadata_is_fuzzy = 0
Returns the unicode representation of the file.
"""
ret = []
entries = [self.metadata_as_entry()] + \
[e for e in self if not e.obsolete]
for entry in entries:
ret.append(entry.__unicode__(self.wrapwidth))
for entry in self.obsolete_entries():
ret.append(entry.__unicode__(self.wrapwidth))
ret = '\n'.join(ret)
if type(ret) != types.UnicodeType:
return unicode(ret, self.encoding)
return ret
def __str__(self):
"""
Returns the string representation of the file.
"""
return unicode(self).encode(self.encoding)
def __contains__(self, entry):
"""
Overriden ``list`` method to implement the membership test (in and
not in).
The method considers that an entry is in the file if it finds an entry
that has the same msgid (the test is **case sensitive**).
Argument:
``entry``
an instance of :class:`~polib._BaseEntry`.
"""
return self.find(entry.msgid, by='msgid') is not None
def __eq__(self, other):
return unicode(self) == unicode(other)
def append(self, entry):
"""
Overriden method to check for duplicates entries, if a user tries to
add an entry that is already in the file, the method will raise a
``ValueError`` exception.
Argument:
``entry``
an instance of :class:`~polib._BaseEntry`.
"""
if self.check_for_duplicates and entry in self:
raise ValueError('Entry "%s" already exists' % entry.msgid)
super(_BaseFile, self).append(entry)
def insert(self, index, entry):
"""
Overriden method to check for duplicates entries, if a user tries to
add an entry that is already in the file, the method will raise a
``ValueError`` exception.
``index``
index at which the entry should be inserted.
``entry``
an instance of :class:`~polib._BaseEntry`.
"""
if self.check_for_duplicates and entry in self:
raise ValueError('Entry "%s" already exists' % entry.msgid)
super(_BaseFile, self).insert(index, entry)
def metadata_as_entry(self):
"""
Returns the file metadata as a :class:`~polib.POFile` instance.
"""
e = POEntry(msgid='')
mdata = self.ordered_metadata()
if mdata:
strs = []
for name, value in mdata:
# Strip whitespace off each line in a multi-line entry
strs.append('%s: %s' % (name, value))
e.msgstr = '\n'.join(strs) + '\n'
if self.metadata_is_fuzzy:
e.flags.append('fuzzy')
return e
def save(self, fpath=None, repr_method='__str__'):
"""
Saves the po file to ``fpath``.
If it is an existing file and no ``fpath`` is provided, then the
existing file is rewritten with the modified data.
Keyword arguments:
``fpath``
string, full or relative path to the file.
``repr_method``
string, the method to use for output.
"""
if self.fpath is None and fpath is None:
raise IOError('You must provide a file path to save() method')
contents = getattr(self, repr_method)()
if fpath is None:
fpath = self.fpath
if repr_method == 'to_binary':
fhandle = open(fpath, 'wb')
else:
fhandle = codecs.open(fpath, 'w', self.encoding)
if type(contents) != types.UnicodeType:
contents = contents.decode(self.encoding)
fhandle.write(contents)
fhandle.close()
# set the file path if not set
if self.fpath is None and fpath:
self.fpath = fpath
def find(self, st, by='msgid', include_obsolete_entries=False,
msgctxt=False):
"""
Find the entry which msgid (or property identified by the ``by``
argument) matches the string ``st``.
Keyword arguments:
``st``
string, the string to search for.
``by``
string, the property to use for comparison (default: ``msgid``).
``include_obsolete_entries``
boolean, whether to also search in entries that are obsolete.
``msgctxt``
string, allows to specify a specific message context for the
search.
if include_obsolete_entries:
entries = self[:]
else:
entries = [e for e in self if not e.obsolete]
for e in entries:
if msgctxt and e.msgctxt != msgctxt:
continue
return e
return None
def ordered_metadata(self):
"""
Convenience method that returns an ordered version of the metadata
dictionary. The return value is list of tuples (metadata name,
"""
# copy the dict first
metadata = self.metadata.copy()
data_order = [
'Project-Id-Version',
'Report-Msgid-Bugs-To',
'POT-Creation-Date',
'PO-Revision-Date',
'Last-Translator',
'Language-Team',
'MIME-Version',
'Content-Type',
'Content-Transfer-Encoding'
]
ordered_data = []
for data in data_order:
try:
value = metadata.pop(data)
ordered_data.append((data, value))
except KeyError:
pass
# the rest of the metadata will be alphabetically ordered since there
# are no specs for this AFAIK
for data in keys:
value = metadata[data]
ordered_data.append((data, value))
return ordered_data
def to_binary(self):
"""
Return the binary representation of the file.
"""
offsets = []
entries = self.translated_entries()
# the keys are sorted in the .mo file
def cmp(_self, other):
# msgfmt compares entries with msgctxt if it exists
if _self.msgctxt:
self_msgid = _self.msgctxt
else:
self_msgid = _self.msgid
if other.msgctxt:
other_msgid = other.msgctxt
else:
other_msgid = other.msgid
elif self_msgid < other_msgid:
return -1
else:
return 0
# add metadata entry
entries.sort(cmp)
mentry = self.metadata_as_entry()
#mentry.msgstr = mentry.msgstr.replace('\\n', '').lstrip()
entries = [mentry] + entries
entries_len = len(entries)
ids, strs = '', ''
for e in entries:
# For each string, we need size and file offset. Each string is
# NUL terminated; the NUL does not count into the size.
msgid = ''
if e.msgctxt:
# Contexts are stored by storing the concatenation of the
# context, a <EOT> byte, and the original string
msgid = self._encode(e.msgctxt + '\4')
if e.msgid_plural:
indexes = e.msgstr_plural.keys()
indexes.sort()
msgstr = []
for index in indexes:
msgstr.append(e.msgstr_plural[index])
msgid += self._encode(e.msgid + '\0' + e.msgid_plural)
msgstr = self._encode('\0'.join(msgstr))
else:
msgid += self._encode(e.msgid)
msgstr = self._encode(e.msgstr)
offsets.append((len(ids), len(msgid), len(strs), len(msgstr)))
ids += msgid + '\0'
strs += msgstr + '\0'
# The header is 7 32-bit unsigned integers.
keystart = 7*4+16*entries_len
# and the values start after the keys
valuestart = keystart + len(ids)
koffsets = []
voffsets = []
# The string table first has the list of keys, then the list of values.
# Each entry has first the size of the string, then the file offset.
for o1, l1, o2, l2 in offsets:
koffsets += [l1, o1+keystart]
voffsets += [l2, o2+valuestart]
offsets = koffsets + voffsets
# check endianness for magic number
if struct.pack('@h', 1) == struct.pack('<h', 1):
magic_number = MOFile.LITTLE_ENDIAN
else:
magic_number = MOFile.BIG_ENDIAN
output = struct.pack(
"Iiiiiii",
magic_number, # Magic number
0, # Version
entries_len, # # of entries
7*4, # start of key index
7*4+entries_len*8, # start of value index
0, keystart # size and offset of hash table
# Important: we don't use hash tables
output += array.array("i", offsets).tostring()
output += ids
output += strs
return output
def _encode(self, mixed):
"""
Encodes the given ``mixed`` argument with the file encoding if and
only if it's an unicode string and returns the encoded string.
"""
if type(mixed) == types.UnicodeType:
return mixed.encode(self.encoding)
return mixed
# }}}
# class POFile {{{
class POFile(_BaseFile):
Po (or Pot) file reader/writer.
This class inherits the :class:`~polib._BaseFile` class and, by extension,
the python ``list`` type.
"""
def __unicode__(self):
"""
Returns the unicode representation of the po file.
"""
ret, headers = '', self.header.split('\n')
for header in headers:
if header[:1] in [',', ':']:
ret += '#%s\n' % header
else:
ret += '# %s\n' % header
if type(ret) != types.UnicodeType:
ret = unicode(ret, self.encoding)
return ret + _BaseFile.__unicode__(self)
def save_as_mofile(self, fpath):
"""
Saves the binary representation of the file to given ``fpath``.
Keyword argument:
``fpath``
string, full or relative path to the mo file.
"""
_BaseFile.save(self, fpath, 'to_binary')
def percent_translated(self):
"""
Convenience method that returns the percentage of translated
messages.
"""
total = len([e for e in self if not e.obsolete])
if total == 0:
return 100
translated = len(self.translated_entries())
return int((100.00 / float(total)) * translated)
def translated_entries(self):
"""
Convenience method that returns the list of translated entries.
"""
return [e for e in self if e.translated()]
def untranslated_entries(self):
"""
Convenience method that returns the list of untranslated entries.
"""
return [e for e in self if not e.translated() and not e.obsolete \
and not 'fuzzy' in e.flags]
def fuzzy_entries(self):
"""
Convenience method that returns the list of fuzzy entries.
"""
return [e for e in self if 'fuzzy' in e.flags]
def obsolete_entries(self):
"""
Convenience method that returns the list of obsolete entries.
"""
return [e for e in self if e.obsolete]
def merge(self, refpot):
"""
Convenience method that merges the current pofile with the pot file
provided. It behaves exactly as the gettext msgmerge utility:
* comments of this file will be preserved, but extracted comments and
occurrences will be discarded;
* any translations or comments in the file will be discarded, however,
dot comments and file positions will be preserved;
* the fuzzy flags are preserved.
``refpot``
object POFile, the reference catalog.
e = self.find(entry.msgid, include_obsolete_entries=True)
if e is None:
e = POEntry()
self.append(e)
e.merge(entry)
# ok, now we must "obsolete" entries that are not in the refpot anymore
for entry in self:
if refpot.find(entry.msgid) is None:
entry.obsolete = True
# }}}
# class MOFile {{{
class MOFile(_BaseFile):
This class inherits the :class:`~polib._BaseFile` class and, by
extension, the python ``list`` type.
"""
BIG_ENDIAN = 0xde120495
LITTLE_ENDIAN = 0x950412de
def __init__(self, *args, **kwargs):
"""
Constructor, accepts all keywords arguments accepted by
:class:`~polib._BaseFile` class.
"""
_BaseFile.__init__(self, *args, **kwargs)
self.magic_number = None
self.version = 0
def save_as_pofile(self, fpath):
"""
Saves the mofile as a pofile to ``fpath``.
Keyword argument:
``fpath``
string, full or relative path to the file.
"""
_BaseFile.save(self, fpath)
Saves the mofile to ``fpath``.
Keyword argument:
``fpath``
string, full or relative path to the file.
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"""
_BaseFile.save(self, fpath, 'to_binary')
def percent_translated(self):
"""
Convenience method to keep the same interface with POFile instances.
"""
return 100
def translated_entries(self):
"""
Convenience method to keep the same interface with POFile instances.
"""
return self
def untranslated_entries(self):
"""
Convenience method to keep the same interface with POFile instances.
"""
return []
def fuzzy_entries(self):
"""
Convenience method to keep the same interface with POFile instances.
"""
return []
def obsolete_entries(self):
"""
Convenience method to keep the same interface with POFile instances.
"""
return []
# }}}
# class _BaseEntry {{{
class _BaseEntry(object):
"""
Base class for :class:`~polib.POEntry` and :class:`~polib.MOEntry` classes.
This class should **not** be instanciated directly.
"""
def __init__(self, *args, **kwargs):
"""
Constructor, accepts the following keyword arguments:
``msgid``
string, the entry msgid.
``msgstr``
string, the entry msgstr.
``msgid_plural``
string, the entry msgid_plural.
``msgstr_plural``
list, the entry msgstr_plural lines.
``msgctxt``
string, the entry context (msgctxt).
``obsolete``
bool, whether the entry is "obsolete" or not.
``encoding``
string, the encoding to use, defaults to ``default_encoding``
global variable (optional).
"""
self.msgid = kwargs.get('msgid', '')
self.msgstr = kwargs.get('msgstr', '')
self.msgid_plural = kwargs.get('msgid_plural', '')
self.msgstr_plural = kwargs.get('msgstr_plural', {})
self.msgctxt = kwargs.get('msgctxt', None)
self.obsolete = kwargs.get('obsolete', False)
self.encoding = kwargs.get('encoding', default_encoding)
def __unicode__(self, wrapwidth=78):
Returns the unicode representation of the entry.
"""
if self.obsolete:
delflag = '#~ '
else:
delflag = ''
ret = []
# write the msgctxt if any
if self.msgctxt is not None:
ret += self._str_field("msgctxt", delflag, "", self.msgctxt, wrapwidth)
ret += self._str_field("msgid", delflag, "", self.msgid, wrapwidth)
# write the msgid_plural if any
if self.msgid_plural:
ret += self._str_field("msgid_plural", delflag, "", self.msgid_plural, wrapwidth)
if self.msgstr_plural:
# write the msgstr_plural if any
msgstrs = self.msgstr_plural
keys = list(msgstrs)
keys.sort()
for index in keys:
msgstr = msgstrs[index]
plural_index = '[%s]' % index
ret += self._str_field("msgstr", delflag, plural_index, msgstr, wrapwidth)
else:
# otherwise write the msgstr
ret += self._str_field("msgstr", delflag, "", self.msgstr, wrapwidth)
ret = '\n'.join(ret)
if type(ret) != types.UnicodeType:
return unicode(ret, self.encoding)
return ret
def __str__(self):
"""
Returns the string representation of the entry.
"""
return unicode(self).encode(self.encoding)
def __eq__(self, other):
return unicode(self) == unicode(other)
def _str_field(self, fieldname, delflag, plural_index, field, wrapwidth=78):
lines = field.splitlines(True)
if len(lines) > 1:
lines = [''] + lines # start with initial empty line
escaped_field = escape(field)
specialchars_count = 0
for c in ['\\', '\n', '\r', '\t', '"']:
specialchars_count += field.count(c)
# comparison must take into account fieldname length + one space
# + 2 quotes (eg. msgid "<string>")
flength = len(fieldname) + 3
if plural_index:
flength += len(plural_index)
real_wrapwidth = wrapwidth - flength + specialchars_count
if wrapwidth > 0 and len(field) > real_wrapwidth:
# Wrap the line but take field name into account
lines = [''] + [unescape(item) for item in wrap(
escaped_field,
wrapwidth - 2, # 2 for quotes ""
drop_whitespace=False,
break_long_words=False
)]
if fieldname.startswith('previous_'):
# quick and dirty trick to get the real field name
fieldname = fieldname[9:]
ret = ['%s%s%s "%s"' % (delflag, fieldname, plural_index,
escape(lines.pop(0)))]
for mstr in lines:
ret.append('%s"%s"' % (delflag, escape(mstr)))
return ret
# }}}
# class POEntry {{{
class POEntry(_BaseEntry):
"""
Represents a po file entry.
"""
def __init__(self, *args, **kwargs):
"""
Constructor, accepts the following keyword arguments:
``comment``
string, the entry comment.
``tcomment``
string, the entry translator comment.
``occurrences``
list, the entry occurrences.
``flags``
list, the entry flags.
``previous_msgctxt``
string, the entry previous context.
``previous_msgid``
string, the entry previous msgid.
``previous_msgid_plural``
string, the entry previous msgid_plural.
"""
_BaseEntry.__init__(self, *args, **kwargs)
self.comment = kwargs.get('comment', '')
self.tcomment = kwargs.get('tcomment', '')
self.occurrences = kwargs.get('occurrences', [])
self.flags = kwargs.get('flags', [])
self.previous_msgctxt = kwargs.get('previous_msgctxt', None)
self.previous_msgid = kwargs.get('previous_msgid', None)
self.previous_msgid_plural = kwargs.get('previous_msgid_plural', None)
def __unicode__(self, wrapwidth=78):
Returns the unicode representation of the entry.
return _BaseEntry.__unicode__(self, wrapwidth)
# comments first, if any (with text wrapping as xgettext does)
comments = [('comment', '#. '), ('tcomment', '# ')]
for c in comments:
val = getattr(self, c[0])
if val:
for comment in val.split('\n'):
if wrapwidth > 0 and len(comment) + len(c[1]) > wrapwidth:
ret += wrap(
comment,
wrapwidth,
initial_indent=c[1],
subsequent_indent=c[1],
break_long_words=False
)
else:
ret.append('%s%s' % (c[1], comment))
# occurrences (with text wrapping as xgettext does)
if self.occurrences:
filelist = []
for fpath, lineno in self.occurrences:
if lineno:
filelist.append('%s:%s' % (fpath, lineno))
else:
filelist.append(fpath)
filestr = ' '.join(filelist)
if wrapwidth > 0 and len(filestr) + 3 > wrapwidth:
# textwrap split words that contain hyphen, this is not
# what we want for filenames, so the dirty hack is to
# temporally replace hyphens with a char that a file cannot
ret += [l.replace('*', '-') for l in wrap(
filestr.replace('-', '*'),
wrapwidth,
initial_indent='#: ',
subsequent_indent='#: ',
break_long_words=False
)]
ret.append('#: ' + filestr)
# flags (TODO: wrapping ?)
ret.append('#, %s' % ', '.join(self.flags))
# previous context and previous msgid/msgid_plural
fields = ['previous_msgctxt', 'previous_msgid', 'previous_msgid_plural']
for f in fields:
val = getattr(self, f)
if val:
ret += self._str_field(f, "#| ", "", val, wrapwidth)
ret.append(_BaseEntry.__unicode__(self, wrapwidth))
ret = '\n'.join(ret)
if type(ret) != types.UnicodeType:
return unicode(ret, self.encoding)
return ret
def __cmp__(self, other):
Called by comparison operations if rich comparison is not defined.
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975
976
977
978
979
980
981
def compare_occurrences(a, b):
"""
Compare an entry occurrence with another one.
"""
if a[0] != b[0]:
return a[0] < b[0]
if a[1] != b[1]:
return a[1] < b[1]
return 0
# First: Obsolete test
if self.obsolete != other.obsolete:
if self.obsolete:
return -1
else:
return 1
# Work on a copy to protect original
occ1 = self.occurrences[:]
occ2 = other.occurrences[:]
# Sorting using compare method
occ1.sort(compare_occurrences)
occ2.sort(compare_occurrences)
# Comparing sorted occurrences
pos = 0
for entry1 in occ1:
try:
entry2 = occ2[pos]
except IndexError:
return 1
pos = pos + 1
if entry1[0] != entry2[0]:
if entry1[0] > entry2[0]:
return 1
else:
return -1
if entry1[1] != entry2[1]:
if entry1[1] > entry2[1]:
return 1
else:
return -1
# Finally: Compare message ID
if self.msgid > other.msgid: return 1
else: return -1
def translated(self):
"""
Returns ``True`` if the entry has been translated or ``False``
otherwise.
"""
if self.obsolete or 'fuzzy' in self.flags:
return False
if self.msgstr != '':
return True
if self.msgstr_plural:
for pos in self.msgstr_plural:
if self.msgstr_plural[pos] == '':
return False
return True
return False
def merge(self, other):
"""
Merge the current entry with the given pot entry.
"""