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      1 /*
      2  * Copyright (C) 2005 Frerich Raabe <raabe (at) 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 "core/xml/XPathUtil.h"
     29 
     30 #include "core/dom/ContainerNode.h"
     31 #include "core/dom/NodeTraversal.h"
     32 #include "wtf/text/StringBuilder.h"
     33 
     34 namespace WebCore {
     35 namespace XPath {
     36 
     37 bool isRootDomNode(Node* node)
     38 {
     39     return node && !node->parentNode();
     40 }
     41 
     42 String stringValue(Node* node)
     43 {
     44     switch (node->nodeType()) {
     45         case Node::ATTRIBUTE_NODE:
     46         case Node::PROCESSING_INSTRUCTION_NODE:
     47         case Node::COMMENT_NODE:
     48         case Node::TEXT_NODE:
     49         case Node::CDATA_SECTION_NODE:
     50         case Node::XPATH_NAMESPACE_NODE:
     51             return node->nodeValue();
     52         default:
     53             if (isRootDomNode(node) || node->nodeType() == Node::ELEMENT_NODE) {
     54                 StringBuilder result;
     55                 result.reserveCapacity(1024);
     56 
     57                 for (Node* n = node->firstChild(); n; n = NodeTraversal::next(*n, node)) {
     58                     if (n->isTextNode()) {
     59                         const String& nodeValue = n->nodeValue();
     60                         result.append(nodeValue);
     61                     }
     62                 }
     63 
     64                 return result.toString();
     65             }
     66     }
     67 
     68     return String();
     69 }
     70 
     71 bool isValidContextNode(Node* node)
     72 {
     73     if (!node)
     74         return false;
     75     switch (node->nodeType()) {
     76         case Node::ATTRIBUTE_NODE:
     77         case Node::CDATA_SECTION_NODE:
     78         case Node::COMMENT_NODE:
     79         case Node::DOCUMENT_NODE:
     80         case Node::ELEMENT_NODE:
     81         case Node::PROCESSING_INSTRUCTION_NODE:
     82         case Node::XPATH_NAMESPACE_NODE:
     83             return true;
     84         case Node::DOCUMENT_FRAGMENT_NODE:
     85         case Node::DOCUMENT_TYPE_NODE:
     86         case Node::ENTITY_NODE:
     87         case Node::NOTATION_NODE:
     88             return false;
     89         case Node::TEXT_NODE:
     90             return !(node->parentNode() && node->parentNode()->isAttributeNode());
     91     }
     92     ASSERT_NOT_REACHED();
     93     return false;
     94 }
     95 
     96 }
     97 }
     98