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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 blink {
     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         return node->nodeValue();
     51     default:
     52         if (isRootDomNode(node) || node->isElementNode()) {
     53             StringBuilder result;
     54             result.reserveCapacity(1024);
     55 
     56             for (Node* n = node->firstChild(); n; n = NodeTraversal::next(*n, node)) {
     57                 if (n->isTextNode()) {
     58                     const String& nodeValue = n->nodeValue();
     59                     result.append(nodeValue);
     60                 }
     61             }
     62 
     63             return result.toString();
     64         }
     65     }
     66 
     67     return String();
     68 }
     69 
     70 bool isValidContextNode(Node* node)
     71 {
     72     if (!node)
     73         return false;
     74     switch (node->nodeType()) {
     75     case Node::ATTRIBUTE_NODE:
     76     case Node::CDATA_SECTION_NODE:
     77     case Node::COMMENT_NODE:
     78     case Node::DOCUMENT_NODE:
     79     case Node::ELEMENT_NODE:
     80     case Node::PROCESSING_INSTRUCTION_NODE:
     81         return true;
     82     case Node::DOCUMENT_FRAGMENT_NODE:
     83     case Node::DOCUMENT_TYPE_NODE:
     84         return false;
     85     case Node::TEXT_NODE:
     86         return !(node->parentNode() && node->parentNode()->isAttributeNode());
     87     }
     88     ASSERT_NOT_REACHED();
     89     return false;
     90 }
     91 
     92 }
     93 }
     94