1 /* 2 * Copyright (C) 2005 Frerich Raabe <raabe (at) kde.org> 3 * Copyright (C) 2006, 2009 Apple Inc. All rights reserved. 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/XPathExpression.h" 29 30 #include "bindings/core/v8/ExceptionState.h" 31 #include "core/dom/ExceptionCode.h" 32 #include "core/xml/XPathExpressionNode.h" 33 #include "core/xml/XPathNSResolver.h" 34 #include "core/xml/XPathParser.h" 35 #include "core/xml/XPathResult.h" 36 #include "core/xml/XPathUtil.h" 37 #include "wtf/text/WTFString.h" 38 39 namespace blink { 40 41 using namespace XPath; 42 43 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(XPathExpression); 44 45 XPathExpression::XPathExpression() 46 { 47 } 48 49 PassRefPtrWillBeRawPtr<XPathExpression> XPathExpression::createExpression(const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver> resolver, ExceptionState& exceptionState) 50 { 51 RefPtrWillBeRawPtr<XPathExpression> expr = XPathExpression::create(); 52 Parser parser; 53 54 expr->m_topExpression = parser.parseStatement(expression, resolver, exceptionState); 55 if (!expr->m_topExpression) 56 return nullptr; 57 58 return expr.release(); 59 } 60 61 void XPathExpression::trace(Visitor* visitor) 62 { 63 visitor->trace(m_topExpression); 64 } 65 66 PassRefPtrWillBeRawPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState& exceptionState) 67 { 68 if (!contextNode) { 69 exceptionState.throwDOMException(NotSupportedError, "The context node provided is null."); 70 return nullptr; 71 } 72 73 if (!isValidContextNode(contextNode)) { 74 exceptionState.throwDOMException(NotSupportedError, "The node provided is '" + contextNode->nodeName() + "', which is not a valid context node type."); 75 return nullptr; 76 } 77 78 EvaluationContext evaluationContext(*contextNode); 79 RefPtrWillBeRawPtr<XPathResult> result = XPathResult::create(evaluationContext, m_topExpression->evaluate(evaluationContext)); 80 81 if (evaluationContext.hadTypeConversionError) { 82 // It is not specified what to do if type conversion fails while evaluating an expression. 83 exceptionState.throwDOMException(SyntaxError, "Type conversion failed while evaluating the expression."); 84 return nullptr; 85 } 86 87 if (type != XPathResult::ANY_TYPE) { 88 result->convertTo(type, exceptionState); 89 if (exceptionState.hadException()) 90 return nullptr; 91 } 92 93 return result; 94 } 95 96 } 97
