#!/usr/bin/env python3

'''

Copyright (C) 2012-2014 Povilas Kanapickas <povilas@radix.lt>

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

class LinkMap:

def __init__(self):

self.mapping = dict()

def read(self, fn):

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

def add_link(self, title, target):

self.mapping[title] = target