1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_SVX_SOURCE_INC_TREEVISITOR_HXX
#define INCLUDED_SVX_SOURCE_INC_TREEVISITOR_HXX
#include <stack>
template< class ELEMENT, class NODEINFO, class PROCESSOR >
class TreeVisitor
{
public:
TreeVisitor( NODEINFO _nodeInfo )
:m_visitedRoot( false )
,m_root()
,m_current()
,m_nodeInfo( _nodeInfo )
{
}
void process( const ELEMENT& _root, PROCESSOR& _processor )
{
m_root = _root;
m_visitedRoot = false;
while ( do_step() )
_processor.process( m_current );
}
private:
bool do_step();
private:
bool m_visitedRoot;
ELEMENT m_root;
ELEMENT m_current;
const NODEINFO m_nodeInfo;
::std::stack< size_t > m_pathToCurrent;
::std::stack< ELEMENT > m_currentAncestors;
};
template< class ELEMENT, class NODEINFO, class PROCESSOR >
bool TreeVisitor< ELEMENT, NODEINFO, PROCESSOR >::do_step()
{
if ( !m_visitedRoot )
{
m_current = m_root;
m_visitedRoot = true;
return true;
}
// can we step down from the current node?
size_t childCount = m_nodeInfo.childCount( m_current );
if ( childCount )
{
m_currentAncestors.push( m_current );
m_current = m_nodeInfo.getChild( m_current, 0 );
m_pathToCurrent.push( 0 );
return true;
}
// is there a right sibling of the current node?
while ( !m_pathToCurrent.empty() )
{
const ELEMENT& currentParent = m_currentAncestors.top();
childCount = m_nodeInfo.childCount( currentParent );
size_t currentChildPos = m_pathToCurrent.top();
if ( ++currentChildPos < childCount )
{
// yes there is
m_pathToCurrent.top() = currentChildPos;
m_current = m_nodeInfo.getChild( currentParent, currentChildPos );
return true;
}
// no there isn't => step up
m_currentAncestors.pop();
m_pathToCurrent.pop();
}
return false;
}
#endif // INCLUDED_SVX_SOURCE_INC_TREEVISITOR_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
