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#!/usr/bin/env python3
'''

This file is part of cppreference-doc

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see http://www.gnu.org/licenses/.
'''

import lxml.etree as e

def __init__(self):
self.mapping = dict()

root = e.parse(fn)
el_files = root.xpath('/files/*')

self.mapping = dict()

for el_file in el_files:
fn_from = el_file.get('from')
fn_to = el_file.get('to')
self.mapping[fn_from] = fn_to

def write(self, fn):
root = e.Element('files')

for key in self.mapping:
file_el = e.SubElement(root, 'file')
file_el.set('from', key)
file_el.set('to', self.mapping[key])

out = open(fn, 'w', encoding='utf-8')
out.write('<?xml version="1.0" encoding="UTF-8"?>')
out.write(e.tostring(root, encoding=str, pretty_print=True))
out.close()

# Returns None on failure
def get_dest(self, target):
if target in self.mapping:
return self.mapping[target]
return None

self.mapping[title] = target