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#!/usr/bin/env python3
#
# Adapted from Apertium
# http://wiki.apertium.org/wiki/Tools_for_TMX
#

from xml.sax import make_parser
from xml.sax.handler import ContentHandler

import sys
import codecs

class TMXHandler(ContentHandler):
    def __init__ (self, slang, tlang, sfile, tfile):
        self.pair = set([slang, tlang])
        self.files = {}
        self.files[slang] = sfile
        self.files[tlang] = tfile
        self.inTag = ""
        self.note = ""
        self.tuid = ""
        self.type = ""
        self.cur_pair = set()
        self.cur_lang = ""
        self.seg = {}
        self.seg[slang] = ""
        self.seg[tlang] = ""

    def startElement(self, name, attrs):

        if name == "tu":
            self.cur_pair = set()
            self.inTag = "tu"
            self.tuid = attrs.get("tuid", "")
            self.type = attrs.get("datatype", "")
        elif name == "note":
            self.inTag = "note"
            self.note = ""
        elif name == "tuv":
            self.inTag = "tuv"
            self.cur_lang = attrs.get("xml:lang", "")
            self.cur_pair.add(self.cur_lang)
        elif name == "seg":
            self.inTag = "seg"
            if self.cur_lang in self.pair:
                self.seg[self.cur_lang] = ""

    def characters (self, c):
        if self.inTag == "note":
            self.note += c
        elif self.inTag == "seg" and self.cur_lang in self.pair:
            self.seg[self.cur_lang] += c

    def endElement(self, name):
        if name == "tu" and self.pair == self.cur_pair:
            for lang in self.cur_pair:
                self.files[lang].write("{}\n".format(self.seg[lang].replace("\n", " ").strip()))


if __name__ == "__main__":
    parser = make_parser()

    if len(sys.argv) < 3:
        print(f"Usage: {sys.argv[0]} <file> <slang> <tlang>")
        print()
        sys.exit(-1)

    sfile_path = f"{sys.argv[1]}.{sys.argv[2]}"
    tfile_path = f"{sys.argv[1]}.{sys.argv[3]}"

    with open(sfile_path, "w+") as sfile, open(tfile_path, "w+") as tfile:
        curHandler = TMXHandler(sys.argv[2], sys.argv[3], sfile, tfile)
        parser.setContentHandler(curHandler)
        with open(sys.argv[1], "r") as tmx_file:
            parser.parse(tmx_file)