3370ffc160923490049d0c26f035c5de65a7743d
[WebKit-https.git] / Source / WebCore / xml / XPathUtil.cpp
1 /*
2  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
3  * Copyright (C) 2006, 2009 Apple Inc.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26
27 #include "config.h"
28 #include "XPathUtil.h"
29
30 #if ENABLE(XPATH)
31
32 #include "ContainerNode.h"
33 #include <wtf/text/StringBuilder.h>
34
35 namespace WebCore {
36 namespace XPath {
37         
38 bool isRootDomNode(Node* node)
39 {
40     return node && !node->parentNode();
41 }
42
43 String stringValue(Node* node)
44 {
45     switch (node->nodeType()) {
46         case Node::ATTRIBUTE_NODE:
47         case Node::PROCESSING_INSTRUCTION_NODE:
48         case Node::COMMENT_NODE:
49         case Node::TEXT_NODE:
50         case Node::CDATA_SECTION_NODE:
51         case Node::XPATH_NAMESPACE_NODE:
52             return node->nodeValue();
53         default:
54             if (isRootDomNode(node) || node->nodeType() == Node::ELEMENT_NODE) {
55                 StringBuilder result;
56                 result.reserveCapacity(1024);
57
58                 for (Node* n = node->firstChild(); n; n = n->traverseNextNode(node)) {
59                     if (n->isTextNode()) {
60                         const String& nodeValue = n->nodeValue();
61                         result.append(nodeValue);
62                     }
63                 }
64
65                 return result.toString();
66             }
67     }
68     
69     return String();
70 }
71
72 bool isValidContextNode(Node* node)
73 {
74     if (!node)
75         return false;
76     switch (node->nodeType()) {
77         case Node::ATTRIBUTE_NODE:
78         case Node::CDATA_SECTION_NODE:
79         case Node::COMMENT_NODE:
80         case Node::DOCUMENT_NODE:
81         case Node::ELEMENT_NODE:
82         case Node::PROCESSING_INSTRUCTION_NODE:
83         case Node::XPATH_NAMESPACE_NODE:
84             return true;
85         case Node::DOCUMENT_FRAGMENT_NODE:
86         case Node::DOCUMENT_TYPE_NODE:
87         case Node::ENTITY_NODE:
88         case Node::ENTITY_REFERENCE_NODE:
89         case Node::NOTATION_NODE:
90         case Node::SHADOW_ROOT_NODE:
91             return false;
92         case Node::TEXT_NODE:
93             return !(node->parentNode() && node->parentNode()->isAttributeNode());
94     }
95     ASSERT_NOT_REACHED();
96     return false;
97 }
98
99 }
100 }
101
102 #endif // ENABLE(XPATH)