245 lines
7.3 KiB
Python
245 lines
7.3 KiB
Python
#! /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. Currently it
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does not handle plural forms but it does handle message contexts.
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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__ = "1.2"
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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(ctxt, 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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if ctxt is None:
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MESSAGES[id] = str
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else:
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MESSAGES[b"%b\x04%b" % (ctxt, 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(
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"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,
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0,
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) # size and offset of hash table
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output += array.array("i", offsets).tobytes()
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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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CTXT = 3
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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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with open(infile, "rb") as f:
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lines = f.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 = msgctxt = 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(msgctxt, msgid, msgstr, fuzzy)
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section = msgctxt = 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 or msgctxt section, output previous section
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if l.startswith("msgctxt"):
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if section == STR:
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add(msgctxt, msgid, msgstr, fuzzy)
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section = CTXT
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l = l[7:]
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msgctxt = b""
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elif l.startswith("msgid") and not l.startswith("msgid_plural"):
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if section == STR:
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add(msgctxt, 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(
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"msgid_plural not preceded by msgid on %s:%d" % (infile, lno), file=sys.stderr
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)
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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), 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(
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"indexed msgstr required for plural on %s:%d" % (infile, lno),
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file=sys.stderr,
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)
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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 == CTXT:
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msgctxt += l.encode(encoding)
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elif 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), "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(msgctxt, msgid, msgstr, fuzzy)
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# Compute output
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output = generate()
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try:
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with open(outfile, "wb") as f:
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f.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:", ["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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