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✏️ Editing: msgfmt3.9.py
#! /usr/bin/python3.9 # Written by Martin v. Löwis <loewis@informatik.hu-berlin.de> """Generate binary message catalog from textual translation description. This program converts a textual Uniforum-style message catalog (.po file) into a binary GNU catalog (.mo file). This is essentially the same function as the GNU msgfmt program, however, it is a simpler implementation. Currently it does not handle plural forms but it does handle message contexts. Usage: msgfmt.py [OPTIONS] filename.po Options: -o file --output-file=file Specify the output file to write to. If omitted, output will go to a file named filename.mo (based off the input file name). -h --help Print this message and exit. -V --version Display version information and exit. """ import os import sys import ast import getopt import struct import array from email.parser import HeaderParser __version__ = "1.2" MESSAGES = {} def usage(code, msg=''): print(__doc__, file=sys.stderr) if msg: print(msg, file=sys.stderr) sys.exit(code) def add(ctxt, id, str, fuzzy): "Add a non-fuzzy translation to the dictionary." global MESSAGES if not fuzzy and str: if ctxt is None: MESSAGES[id] = str else: MESSAGES[b"%b\x04%b" % (ctxt, id)] = str def generate(): "Return the generated output." global MESSAGES # the keys are sorted in the .mo file keys = sorted(MESSAGES.keys()) offsets = [] ids = strs = b'' for id in keys: # For each string, we need size and file offset. Each string is NUL # terminated; the NUL does not count into the size. offsets.append((len(ids), len(id), len(strs), len(MESSAGES[id]))) ids += id + b'\0' strs += MESSAGES[id] + b'\0' output = '' # The header is 7 32-bit unsigned integers. We don't use hash tables, so # the keys start right after the index tables. # translated string. keystart = 7*4+16*len(keys) # 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 output = struct.pack("Iiiiiii", 0x950412de, # Magic 0, # Version len(keys), # # of entries 7*4, # start of key index 7*4+len(keys)*8, # start of value index 0, 0) # size and offset of hash table output += array.array("i", offsets).tobytes() output += ids output += strs return output def make(filename, outfile): ID = 1 STR = 2 CTXT = 3 # Compute .mo name from .po name and arguments if filename.endswith('.po'): infile = filename else: infile = filename + '.po' if outfile is None: outfile = os.path.splitext(infile)[0] + '.mo' try: with open(infile, 'rb') as f: lines = f.readlines() except IOError as msg: print(msg, file=sys.stderr) sys.exit(1) section = msgctxt = None fuzzy = 0 # Start off assuming Latin-1, so everything decodes without failure, # until we know the exact encoding encoding = 'latin-1' # Parse the catalog lno = 0 for l in lines: l = l.decode(encoding) lno += 1 # If we get a comment line after a msgstr, this is a new entry if l[0] == '#' and section == STR: add(msgctxt, msgid, msgstr, fuzzy) section = msgctxt = None fuzzy = 0 # Record a fuzzy mark if l[:2] == '#,' and 'fuzzy' in l: fuzzy = 1 # Skip comments if l[0] == '#': continue # Now we are in a msgid or msgctxt section, output previous section if l.startswith('msgctxt'): if section == STR: add(msgctxt, msgid, msgstr, fuzzy) section = CTXT l = l[7:] msgctxt = b'' elif l.startswith('msgid') and not l.startswith('msgid_plural'): if section == STR: add(msgctxt, msgid, msgstr, fuzzy) if not msgid: # See whether there is an encoding declaration p = HeaderParser() charset = p.parsestr(msgstr.decode(encoding)).get_content_charset() if charset: encoding = charset section = ID l = l[5:] msgid = msgstr = b'' is_plural = False # This is a message with plural forms elif l.startswith('msgid_plural'): if section != ID: print('msgid_plural not preceded by msgid on %s:%d' % (infile, lno), file=sys.stderr) sys.exit(1) l = l[12:] msgid += b'\0' # separator of singular and plural is_plural = True # Now we are in a msgstr section elif l.startswith('msgstr'): section = STR if l.startswith('msgstr['): if not is_plural: print('plural without msgid_plural on %s:%d' % (infile, lno), file=sys.stderr) sys.exit(1) l = l.split(']', 1)[1] if msgstr: msgstr += b'\0' # Separator of the various plural forms else: if is_plural: print('indexed msgstr required for plural on %s:%d' % (infile, lno), file=sys.stderr) sys.exit(1) l = l[6:] # Skip empty lines l = l.strip() if not l: continue l = ast.literal_eval(l) if section == CTXT: msgctxt += l.encode(encoding) elif section == ID: msgid += l.encode(encoding) elif section == STR: msgstr += l.encode(encoding) else: print('Syntax error on %s:%d' % (infile, lno), \ 'before:', file=sys.stderr) print(l, file=sys.stderr) sys.exit(1) # Add last entry if section == STR: add(msgctxt, msgid, msgstr, fuzzy) # Compute output output = generate() try: with open(outfile,"wb") as f: f.write(output) except IOError as msg: print(msg, file=sys.stderr) def main(): try: opts, args = getopt.getopt(sys.argv[1:], 'hVo:', ['help', 'version', 'output-file=']) except getopt.error as msg: usage(1, msg) outfile = None # parse options for opt, arg in opts: if opt in ('-h', '--help'): usage(0) elif opt in ('-V', '--version'): print("msgfmt.py", __version__) sys.exit(0) elif opt in ('-o', '--output-file'): outfile = arg # do it if not args: print('No input file given', file=sys.stderr) print("Try `msgfmt --help' for more information.", file=sys.stderr) return for filename in args: make(filename, outfile) if __name__ == '__main__': main()
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