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#! /usr/bin/env python3
# Written by Martin v. Löwis <>
"""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: [OPTIONS] filename.po
-o file
Specify the output file to write to. If omitted, output will go to a
file named (based off the input file name).
Print this message and exit.
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"
def usage(code, msg=''):
print(__doc__, file=sys.stderr)
if msg:
print(msg, file=sys.stderr)
def add(ctxt, id, str, fuzzy):
"Add a non-fuzzy translation to the dictionary."
if not fuzzy and str:
if ctxt is None:
MESSAGES[id] = str
MESSAGES[b"%b\x04%b" % (ctxt, id)] = str
def generate():
"Return the generated output."
# 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
infile = filename + '.po'
if outfile is None:
outfile = os.path.splitext(infile)[0] + '.mo'
with open(infile, 'rb') as f:
lines = f.readlines()
except IOError as msg:
print(msg, file=sys.stderr)
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] == '#':
# 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),
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),
l = l.split(']', 1)[1]
if msgstr:
msgstr += b'\0' # Separator of the various plural forms
if is_plural:
print('indexed msgstr required for plural on %s:%d' % (infile, lno),
l = l[6:]
# Skip empty lines
l = l.strip()
if not l:
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)
print('Syntax error on %s:%d' % (infile, lno), \
'before:', file=sys.stderr)
print(l, file=sys.stderr)
# Add last entry
if section == STR:
add(msgctxt, msgid, msgstr, fuzzy)
# Compute output
output = generate()
with open(outfile,"wb") as f:
except IOError as msg:
print(msg, file=sys.stderr)
def main():
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'):
elif opt in ('-V', '--version'):
print("", __version__)
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)
for filename in args:
make(filename, outfile)
if __name__ == '__main__':
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