306 lines
10 KiB
Python
Executable File
306 lines
10 KiB
Python
Executable File
#! /usr/bin/env python
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# -*- coding: iso-8859-1 -*-
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# Written by Martin v. Loewis <loewis@informatik.hu-berlin.de>
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#
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# Changed by Christian 'Tiran' Heimes <tiran@cheimes.de> for the placeless
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# translation service (PTS) of Zope
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#
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# Fixed some bugs and updated to support msgctxt
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# by Hanno Schlichting <hanno@hannosch.eu>
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"""Generate binary message catalog from textual translation description.
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This program converts a textual Uniforum-style message catalog (.po file) into
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a binary GNU catalog (.mo file). This is essentially the same function as the
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GNU msgfmt program, however, it is a simpler implementation.
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This file was taken from Python-2.3.2/Tools/i18n and altered in several ways.
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Now you can simply use it from another python module:
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from msgfmt import Msgfmt
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mo = Msgfmt(po).get()
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where po is path to a po file as string, an opened po file ready for reading or
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a list of strings (readlines of a po file) and mo is the compiled mo file as
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binary string.
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Exceptions:
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* IOError if the file couldn't be read
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* msgfmt.PoSyntaxError if the po file has syntax errors
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"""
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from __future__ import print_function
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import array
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from ast import literal_eval
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import codecs
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from email.parser import HeaderParser
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import getopt
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import struct
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import sys
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PY3 = sys.version_info[0] == 3
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if PY3:
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def header_charset(s):
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p = HeaderParser()
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return p.parsestr(s).get_content_charset()
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import io
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BytesIO = io.BytesIO
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FILE_TYPE = io.IOBase
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else:
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def header_charset(s):
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p = HeaderParser()
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return p.parsestr(s.encode('utf-8', 'ignore')).get_content_charset()
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from cStringIO import StringIO as BytesIO
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FILE_TYPE = file
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class PoSyntaxError(Exception):
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""" Syntax error in a po file """
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def __init__(self, msg):
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self.msg = msg
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def __str__(self):
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return 'Po file syntax error: %s' % self.msg
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class Msgfmt:
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def __init__(self, po, name='unknown'):
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self.po = po
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self.name = name
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self.messages = {}
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self.openfile = False
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# Start off assuming latin-1, so everything decodes without failure,
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# until we know the exact encoding
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self.encoding = 'latin-1'
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def readPoData(self):
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""" read po data from self.po and return an iterator """
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output = []
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if isinstance(self.po, str):
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output = open(self.po, 'rb')
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elif isinstance(self.po, FILE_TYPE):
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self.po.seek(0)
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self.openfile = True
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output = self.po
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elif isinstance(self.po, list):
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output = self.po
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if not output:
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raise ValueError("self.po is invalid! %s" % type(self.po))
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if isinstance(output, FILE_TYPE):
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# remove BOM from the start of the parsed input
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first = output.readline()
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if len(first) == 0:
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return output.readlines()
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if first.startswith(codecs.BOM_UTF8):
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first = first.lstrip(codecs.BOM_UTF8)
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return [first] + output.readlines()
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return output
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def add(self, context, id, string, fuzzy):
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"Add a non-empty and non-fuzzy translation to the dictionary."
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if string and not fuzzy:
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# The context is put before the id and separated by a EOT char.
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if context:
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id = context + u'\x04' + id
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if not id:
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# See whether there is an encoding declaration
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charset = header_charset(string)
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if charset:
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# decode header in proper encoding
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string = string.encode(self.encoding).decode(charset)
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if not PY3:
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# undo damage done by literal_eval in Python 2.x
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string = string.encode(self.encoding).decode(charset)
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self.encoding = charset
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self.messages[id] = string
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def generate(self):
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"Return the generated output."
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# the keys are sorted in the .mo file
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keys = sorted(self.messages.keys())
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offsets = []
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ids = strs = b''
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for id in keys:
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msg = self.messages[id].encode(self.encoding)
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id = id.encode(self.encoding)
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# For each string, we need size and file offset. Each string is
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# NUL terminated; the NUL does not count into the size.
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offsets.append((len(ids), len(id), len(strs),
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len(msg)))
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ids += id + b'\0'
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strs += msg + b'\0'
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output = b''
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# The header is 7 32-bit unsigned integers. We don't use hash tables,
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# so the keys start right after the index tables.
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keystart = 7 * 4 + 16 * len(keys)
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# and the values start after the keys
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valuestart = keystart + len(ids)
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koffsets = []
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voffsets = []
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# The string table first has the list of keys, then the list of values.
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# Each entry has first the size of the string, then the file offset.
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for o1, l1, o2, l2 in offsets:
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koffsets += [l1, o1 + keystart]
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voffsets += [l2, o2 + valuestart]
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offsets = koffsets + voffsets
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# Even though we don't use a hashtable, we still set its offset to be
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# binary compatible with the gnu gettext format produced by:
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# msgfmt file.po --no-hash
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output = struct.pack("Iiiiiii",
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0x950412de, # Magic
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0, # Version
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len(keys), # # of entries
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7 * 4, # start of key index
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7 * 4 + len(keys) * 8, # start of value index
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0, keystart) # size and offset of hash table
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if PY3:
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output += array.array("i", offsets).tobytes()
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else:
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output += array.array("i", offsets).tostring()
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output += ids
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output += strs
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return output
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def get(self):
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""" """
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self.read()
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# Compute output
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return self.generate()
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def read(self, header_only=False):
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""" """
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ID = 1
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STR = 2
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CTXT = 3
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section = None
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fuzzy = 0
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msgid = msgstr = msgctxt = u''
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# Parse the catalog
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lno = 0
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for l in self.readPoData():
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l = l.decode(self.encoding)
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lno += 1
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# If we get a comment line after a msgstr or a line starting with
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# msgid or msgctxt, this is a new entry
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if section == STR and (l[0] == '#' or (l[0] == 'm' and
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(l.startswith('msgctxt') or l.startswith('msgid')))):
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self.add(msgctxt, msgid, msgstr, fuzzy)
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section = None
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fuzzy = 0
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# If we only want the header we stop after the first message
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if header_only:
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break
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# Record a fuzzy mark
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if l[:2] == '#,' and 'fuzzy' in l:
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fuzzy = 1
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# Skip comments
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if l[0] == '#':
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continue
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# Now we are in a msgctxt section
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if l.startswith('msgctxt'):
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section = CTXT
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l = l[7:]
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msgctxt = u''
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# Now we are in a msgid section, output previous section
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elif (l.startswith('msgid') and
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not l.startswith('msgid_plural')):
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if section == STR:
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self.add(msgid, msgstr, fuzzy)
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section = ID
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l = l[5:]
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msgid = msgstr = u''
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is_plural = False
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# This is a message with plural forms
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elif l.startswith('msgid_plural'):
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if section != ID:
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raise PoSyntaxError(
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'msgid_plural not preceded by '
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'msgid on line %d of po file %s' %
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(lno, repr(self.name)))
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l = l[12:]
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msgid += u'\0' # separator of singular and plural
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is_plural = True
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# Now we are in a msgstr section
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elif l.startswith('msgstr'):
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section = STR
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if l.startswith('msgstr['):
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if not is_plural:
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raise PoSyntaxError(
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'plural without msgid_plural '
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'on line %d of po file %s' %
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(lno, repr(self.name)))
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l = l.split(']', 1)[1]
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if msgstr:
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# Separator of the various plural forms
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msgstr += u'\0'
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else:
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if is_plural:
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raise PoSyntaxError(
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'indexed msgstr required for '
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'plural on line %d of po file %s' %
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(lno, repr(self.name)))
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l = l[6:]
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# Skip empty lines
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l = l.strip()
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if not l:
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continue
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# TODO: Does this always follow Python escape semantics?
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try:
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l = literal_eval(l)
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except Exception as msg:
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raise PoSyntaxError(
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'%s (line %d of po file %s): \n%s' %
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(msg, lno, repr(self.name), l))
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if isinstance(l, bytes):
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l = l.decode(self.encoding)
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if section == CTXT:
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msgctxt += l
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elif section == ID:
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msgid += l
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elif section == STR:
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msgstr += l
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else:
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raise PoSyntaxError(
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'error on line %d of po file %s' %
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(lno, repr(self.name)))
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# Add last entry
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if section == STR:
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self.add(msgctxt, msgid, msgstr, fuzzy)
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if self.openfile:
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self.po.close()
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def getAsFile(self):
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return BytesIO(self.get())
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def main():
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'o:')
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except getopt.error as msg:
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print(msg, file=sys.stderr)
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sys.exit(1)
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if not args:
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print('No input file given', file=sys.stderr)
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sys.exit(1)
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if not opts:
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print('No output file given', file=sys.stderr)
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sys.exit(1)
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with open(opts[0][1], "wb") as mo:
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mo.write(Msgfmt(args[0]).get())
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if __name__ == '__main__':
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main()
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