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msgfmt.py
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msgfmt.py
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#!/usr/bin/env python
# -*- coding: iso-8859-1 -*-
# Written by Martin v. Lwis <[email protected]>
# Plural forms support added by alexander smishlajev <[email protected]>
# Python 3 support by Shang Yuanchun <[email protected]>
"""
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.
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 sys
import os
import getopt
import struct
import array
__version__ = "1.1"
MESSAGES = {}
def usage (ecode, msg=''):
"""
Print usage and msg and exit with given code.
"""
sys.stderr.write(__doc__)
sys.stderr.write("\n")
if msg:
sys.stderr.write(msg)
sys.stderr.write('\n')
sys.exit(ecode)
def add (msgid, transtr, fuzzy):
"""
Add a non-fuzzy translation to the dictionary.
"""
global MESSAGES
if not fuzzy and transtr and not transtr.startswith('\0'):
MESSAGES[msgid] = transtr
def generate ():
"""
Return the generated output.
"""
global MESSAGES
keys = list(MESSAGES.keys())
# the keys are sorted in the .mo file
keys.sort()
offsets = []
ids = strs = ''
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 + '\0'
strs += MESSAGES[_id] + '\0'
if sys.version_info.major >= 3:
ids = ids.encode(encoding='UTF-8')
strs = strs.encode(encoding='UTF-8')
# 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).tostring()
output += ids
output += strs
return output
def make (filename, outfile):
ID = 1
STR = 2
global MESSAGES
MESSAGES = {}
# 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:
lines = open(infile).readlines()
except IOError as msg:
# if python 3
# print(msg, file=sys.stderr)
sys.stderr.write(msg)
sys.stderr.write('\n')
sys.exit(1)
section = None
fuzzy = 0
# Parse the catalog
msgid = msgstr = ''
lno = 0
for l in lines:
lno += 1
# If we get a comment line after a msgstr, this is a new entry
if l[0] == '#' and section == STR:
add(msgid, msgstr, fuzzy)
section = None
fuzzy = 0
# Record a fuzzy mark
if l[:2] == '#,' and (l.find('fuzzy') >= 0):
fuzzy = 1
# Skip comments
if l[0] == '#':
continue
# Start of msgid_plural section, separate from singular form with \0
if l.startswith('msgid_plural'):
msgid += '\0'
l = l[12:]
# Now we are in a msgid section, output previous section
elif l.startswith('msgid'):
if section == STR:
add(msgid, msgstr, fuzzy)
section = ID
l = l[5:]
msgid = msgstr = ''
# Now we are in a msgstr section
elif l.startswith('msgstr'):
section = STR
l = l[6:]
# Check for plural forms
if l.startswith('['):
# Separate plural forms with \0
if not l.startswith('[0]'):
msgstr += '\0'
# Ignore the index - must come in sequence
l = l[l.index(']') + 1:]
# Skip empty lines
l = l.strip()
if not l:
continue
# XXX: Does this always follow Python escape semantics?
l = eval(l)
if section == ID:
msgid += l
elif section == STR:
msgstr += l
else:
sys.stderr.write('Syntax error on %s:%d' % (infile, lno), \
'before:')
sys.stderr.write(l)
sys.stderr.write('\n')
sys.exit(1)
# Add last entry
if section == STR:
add(msgid, msgstr, fuzzy)
# Compute output
output = generate()
try:
open(outfile,"wb").write(output)
except IOError as msg:
sys.stderr.write(msg)
sys.stderr.write("\n")
def main ():
try:
opts, args = getopt.getopt(sys.argv[1:], 'hVo:',
['help', 'version', 'output-file='])
except getopt.error as msg:
usage(1, str(msg))
outfile = None
# parse options
for opt, arg in opts:
if opt in ('-h', '--help'):
usage(0)
elif opt in ('-V', '--version'):
sys.stderr.write("msgfmt.py %s\n" % __version__)
sys.exit(0)
elif opt in ('-o', '--output-file'):
outfile = arg
# do it
if not args:
sys.stderr.write('No input file given\n')
sys.stderr.write("Try `msgfmt --help' for more information.\n")
return
for filename in args:
make(filename, outfile)
if __name__ == '__main__':
main()