#!/usr/bin/env python
##############################################################################
#
# Copyright (c) 2002 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
# Modifications for Roundup:
# 1. commented out ITALES references
# 2. escape quotes and line feeds in msgids
# 3. don't collect empty msgids

"""Program to extract internationalization markup from Page Templates.

Once you have marked up a Page Template file with i18n: namespace tags, use
this program to extract GNU gettext .po file entries.

Usage: talgettext.py [options] files
Options:
    -h / --help
        Print this message and exit.
    -o / --output <file>
        Output the translation .po file to <file>.
    -u / --update <file>
        Update the existing translation <file> with any new translation strings
        found.
"""

import sys
import time
import getopt
import traceback

from roundup import __version__
from roundup.cgi.TAL.HTMLTALParser import HTMLTALParser
from roundup.cgi.TAL.TALInterpreter import TALInterpreter
from roundup.cgi.TAL.DummyEngine import DummyEngine
#from ITALES import ITALESEngine
from roundup.cgi.TAL.TALDefs import TALESError

pot_header = '''\
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR ORGANIZATION
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\\n"
"POT-Creation-Date: %(time)s\\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\\n"
"Language-Team: LANGUAGE <LL@li.org>\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=CHARSET\\n"
"Content-Transfer-Encoding: ENCODING\\n"
"Generated-By: talgettext.py %(version)s\\n"
'''

NLSTR = '"\n"'

try:
    True
except NameError:
    True=1
    False=0

def usage(code, msg=''):
    # Python 2.1 required
    print >> sys.stderr, __doc__
    if msg:
        print >> sys.stderr, msg
    sys.exit(code)


class POTALInterpreter(TALInterpreter):
    def translate(self, msgid, default, i18ndict=None, obj=None):
        # XXX is this right?
        if i18ndict is None:
            i18ndict = {}
        if obj:
            i18ndict.update(obj)
        # XXX Mmmh, it seems that sometimes the msgid is None; is that really
        # possible?
        if msgid is None:
            return None
        # XXX We need to pass in one of context or target_language
        return self.engine.translate(msgid, self.i18nContext.domain, i18ndict,
                                     position=self.position, default=default)


class POEngine(DummyEngine):
    #__implements__ = ITALESEngine

    def __init__(self, macros=None):
        self.catalog = {}
        DummyEngine.__init__(self, macros)

    def evaluate(*args):
        return '' # who cares

    def evaluatePathOrVar(*args):
        return '' # who cares

    def evaluateSequence(self, expr):
        return (0,) # dummy

    def evaluateBoolean(self, expr):
        return True # dummy

    def translate(self, msgid, domain=None, mapping=None, default=None,
                  # XXX position is not part of the ITALESEngine
                  #     interface
                  position=None):

        if not msgid: return 'x'

        if domain not in self.catalog:
            self.catalog[domain] = {}
        domain = self.catalog[domain]

        if msgid not in domain:
            domain[msgid] = []
        domain[msgid].append((self.file, position))
        return 'x'


class UpdatePOEngine(POEngine):
    """A slightly-less braindead POEngine which supports loading an existing
    .po file first."""

    def __init__ (self, macros=None, filename=None):
        POEngine.__init__(self, macros)

        self._filename = filename
        self._loadFile()
        self.base = self.catalog
        self.catalog = {}

    def __add(self, id, s, fuzzy):
        "Add a non-fuzzy translation to the dictionary."
        if not fuzzy and str:
            # check for multi-line values and munge them appropriately
            if '\n' in s:
                lines = s.rstrip().split('\n')
                s = NLSTR.join(lines)
            self.catalog[id] = s

    def _loadFile(self):
        # shamelessly cribbed from Python's Tools/i18n/msgfmt.py
        # 25-Mar-2003 Nathan R. Yergler (nathan@zope.org)
        # 14-Apr-2003 Hacked by Barry Warsaw (barry@zope.com)

        ID = 1
        STR = 2

        try:
            lines = open(self._filename).readlines()
        except IOError, msg:
            print >> sys.stderr, msg
            sys.exit(1)

        section = None
        fuzzy = False

        # Parse the catalog
        lno = 0
        for l in lines:
            lno += True
            # If we get a comment line after a msgstr, this is a new entry
            if l[0] == '#' and section == STR:
                self.__add(msgid, msgstr, fuzzy)
                section = None
                fuzzy = False
            # Record a fuzzy mark
            if l[:2] == '#,' and l.find('fuzzy'):
                fuzzy = True
            # Skip comments
            if l[0] == '#':
                continue
            # Now we are in a msgid section, output previous section
            if l.startswith('msgid'):
                if section == STR:
                    self.__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:]
            # Skip empty lines
            if not l.strip():
                continue
            # XXX: Does this always follow Python escape semantics?
            l = eval(l)
            if section == ID:
                msgid += l
            elif section == STR:
                msgstr += '%s\n' % l
            else:
                print >> sys.stderr, 'Syntax error on %s:%d' % (infile, lno), \
                      'before:'
                print >> sys.stderr, l
                sys.exit(1)
        # Add last entry
        if section == STR:
            self.__add(msgid, msgstr, fuzzy)

    def evaluate(self, expression):
        try:
            return POEngine.evaluate(self, expression)
        except TALESError:
            pass

    def evaluatePathOrVar(self, expr):
        return 'who cares'

    def translate(self, msgid, domain=None, mapping=None, default=None,
                  position=None):
        if msgid not in self.base:
            POEngine.translate(self, msgid, domain, mapping, default, position)
        return 'x'


def main():
    try:
        opts, args = getopt.getopt(
            sys.argv[1:],
            'ho:u:',
            ['help', 'output=', 'update='])
    except getopt.error, msg:
        usage(1, msg)

    outfile = None
    engine = None
    update_mode = False
    for opt, arg in opts:
        if opt in ('-h', '--help'):
            usage(0)
        elif opt in ('-o', '--output'):
            outfile = arg
        elif opt in ('-u', '--update'):
            update_mode = True
            if outfile is None:
                outfile = arg
            engine = UpdatePOEngine(filename=arg)

    if not args:
        print 'nothing to do'
        return

    # We don't care about the rendered output of the .pt file
    class Devnull:
        def write(self, s):
            pass

    # check if we've already instantiated an engine;
    # if not, use the stupidest one available
    if not engine:
        engine = POEngine()

    # process each file specified
    for filename in args:
        try:
            engine.file = filename
            p = HTMLTALParser()
            p.parseFile(filename)
            program, macros = p.getCode()
            POTALInterpreter(program, macros, engine, stream=Devnull(),
                             metal=False)()
        except: # Hee hee, I love bare excepts!
            print 'There was an error processing', filename
            traceback.print_exc()

    # Now output the keys in the engine.  Write them to a file if --output or
    # --update was specified; otherwise use standard out.
    if (outfile is None):
        outfile = sys.stdout
    else:
        outfile = file(outfile, update_mode and "a" or "w")

    catalog = {}
    for domain in engine.catalog.keys():
        catalog.update(engine.catalog[domain])

    messages = catalog.copy()
    try:
        messages.update(engine.base)
    except AttributeError:
        pass
    if '' not in messages:
        print >> outfile, pot_header % {'time': time.ctime(),
                                        'version': __version__}

    msgids = catalog.keys()
    # XXX: You should not sort by msgid, but by filename and position. (SR)
    msgids.sort()
    for msgid in msgids:
        positions = catalog[msgid]
        for filename, position in positions:
            outfile.write('#: %s:%s\n' % (filename, position[0]))

        outfile.write('msgid "%s"\n'
            % msgid.replace('"', '\\"').replace("\n", '\\n"\n"'))
        outfile.write('msgstr ""\n')
        outfile.write('\n')


if __name__ == '__main__':
    main()