cpython/Tools/i18n/msgfmt.py at main · python/cpython · GitHub

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#! /usr/bin/env python3

# 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.

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 array

import ast

import codecs

import getopt

import os

import struct

import sys

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 OSError as msg:

print(msg, file=sys.stderr)

sys.exit(1)

if lines[0].startswith(codecs.BOM_UTF8):

print(

f"The file {infile} starts with a UTF-8 BOM which is not allowed in .po files.\n"

"Please save the file without a BOM and try again.",

file=sys.stderr

)

sys.exit(1)

section = msgctxt = None

msgid = msgstr = b''

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:

if not msgid:

# Filter out POT-Creation-Date

# See issue #131852

msgstr = b''.join(line for line in msgstr.splitlines(True)

if not line.startswith(b'POT-Creation-Date:'))

# See whether there is an encoding declaration

p = HeaderParser()

charset = p.parsestr(msgstr.decode(encoding)).get_content_charset()

if charset:

encoding = charset

add(msgctxt, msgid, msgstr, fuzzy)

msgctxt = None

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(f'msgid_plural not preceded by msgid on {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(f'plural without msgid_plural on {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(f'indexed msgstr required for plural on {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(f'Syntax error on {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 OSError 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()

cpython/Tools/i18n/msgfmt.py at main · python/cpython · GitHub

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