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#! /usr/bin/env python3
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# Written by Martin v. Löwis <loewis@informatik.hu-berlin.de>
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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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Usage: msgfmt.py [OPTIONS] filename.po
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Options:
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-o file
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--output-file=file
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Specify the output file to write to. If omitted, output will go to a
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file named filename.mo (based off the input file name).
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-h
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--help
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Print this message and exit.
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-V
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--version
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Display version information and exit.
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"""
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import os
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import sys
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import ast
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import getopt
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import struct
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import array
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from email.parser import HeaderParser
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__version__ = "1.1"
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MESSAGES = {}
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def usage(code, msg=''):
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print(__doc__, file=sys.stderr)
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if msg:
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print(msg, file=sys.stderr)
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sys.exit(code)
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def add(id, str, fuzzy):
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"Add a non-fuzzy translation to the dictionary."
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global MESSAGES
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if not fuzzy and str:
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MESSAGES[id] = str
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def generate():
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"Return the generated output."
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global MESSAGES
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# the keys are sorted in the .mo file
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keys = sorted(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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# For each string, we need size and file offset. Each string is NUL
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# terminated; the NUL does not count into the size.
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offsets.append((len(ids), len(id), len(strs), len(MESSAGES[id])))
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ids += id + b'\0'
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strs += MESSAGES[id] + b'\0'
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output = ''
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# The header is 7 32-bit unsigned integers. We don't use hash tables, so
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# the keys start right after the index tables.
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# translated string.
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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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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, 0) # size and offset of hash table
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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 make(filename, outfile):
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ID = 1
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STR = 2
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# Compute .mo name from .po name and arguments
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if filename.endswith('.po'):
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infile = filename
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else:
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infile = filename + '.po'
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if outfile is None:
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outfile = os.path.splitext(infile)[0] + '.mo'
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try:
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lines = open(infile, 'rb').readlines()
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except IOError as msg:
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print(msg, file=sys.stderr)
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sys.exit(1)
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section = None
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fuzzy = 0
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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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encoding = 'latin-1'
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# Parse the catalog
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lno = 0
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for l in lines:
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l = l.decode(encoding)
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lno += 1
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# If we get a comment line after a msgstr, this is a new entry
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if l[0] == '#' and section == STR:
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add(msgid, msgstr, fuzzy)
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section = None
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fuzzy = 0
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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 msgid section, output previous section
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if l.startswith('msgid') and not l.startswith('msgid_plural'):
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if section == STR:
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add(msgid, msgstr, fuzzy)
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if not msgid:
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# See whether there is an encoding declaration
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p = HeaderParser()
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charset = p.parsestr(msgstr.decode(encoding)).get_content_charset()
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if charset:
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encoding = charset
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section = ID
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l = l[5:]
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msgid = msgstr = b''
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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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print('msgid_plural not preceded by msgid on %s:%d' % (infile, lno),
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file=sys.stderr)
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sys.exit(1)
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l = l[12:]
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msgid += b'\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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print('plural without msgid_plural on %s:%d' % (infile, lno),
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file=sys.stderr)
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sys.exit(1)
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l = l.split(']', 1)[1]
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if msgstr:
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msgstr += b'\0' # Separator of the various plural forms
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else:
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if is_plural:
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print('indexed msgstr required for plural on %s:%d' % (infile, lno),
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file=sys.stderr)
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sys.exit(1)
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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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l = ast.literal_eval(l)
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if section == ID:
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msgid += l.encode(encoding)
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elif section == STR:
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msgstr += l.encode(encoding)
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else:
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print('Syntax error on %s:%d' % (infile, lno), \
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'before:', file=sys.stderr)
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print(l, file=sys.stderr)
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sys.exit(1)
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# Add last entry
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if section == STR:
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add(msgid, msgstr, fuzzy)
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# Compute output
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output = generate()
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try:
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open(outfile,"wb").write(output)
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except IOError as msg:
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print(msg, file=sys.stderr)
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def main():
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'hVo:',
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['help', 'version', 'output-file='])
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except getopt.error as msg:
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usage(1, msg)
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outfile = None
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# parse options
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for opt, arg in opts:
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if opt in ('-h', '--help'):
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usage(0)
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elif opt in ('-V', '--version'):
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print("msgfmt.py", __version__)
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sys.exit(0)
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elif opt in ('-o', '--output-file'):
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outfile = arg
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# do it
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if not args:
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print('No input file given', file=sys.stderr)
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print("Try `msgfmt --help' for more information.", file=sys.stderr)
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return
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for filename in args:
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make(filename, outfile)
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if __name__ == '__main__':
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main()
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