1/*
2 * Copyright (C) 2005 Frerich Raabe <raabe@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 "XPathExpression.h"
29
30#include "Document.h"
31#include "XPathNSResolver.h"
32#include "XPathParser.h"
33#include "XPathResult.h"
34#include "XPathUtil.h"
35
36namespace WebCore {
37
38using namespace XPath;
39
40inline XPathExpression::XPathExpression(std::unique_ptr<XPath::Expression> expression)
41 : m_topExpression(WTFMove(expression))
42{
43}
44
45ExceptionOr<Ref<XPathExpression>> XPathExpression::createExpression(const String& expression, RefPtr<XPathNSResolver>&& resolver)
46{
47 auto parseResult = Parser::parseStatement(expression, WTFMove(resolver));
48 if (parseResult.hasException())
49 return parseResult.releaseException();
50
51 return adoptRef(*new XPathExpression(parseResult.releaseReturnValue()));
52}
53
54XPathExpression::~XPathExpression() = default;
55
56// FIXME: Why does this take an XPathResult that it ignores?
57ExceptionOr<Ref<XPathResult>> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*)
58{
59 if (!isValidContextNode(contextNode))
60 return Exception { NotSupportedError };
61
62 EvaluationContext& evaluationContext = Expression::evaluationContext();
63 evaluationContext.node = contextNode;
64 evaluationContext.size = 1;
65 evaluationContext.position = 1;
66 evaluationContext.hadTypeConversionError = false;
67 auto result = XPathResult::create(contextNode->document(), m_topExpression->evaluate());
68 evaluationContext.node = nullptr; // Do not hold a reference to the context node, as this may prevent the whole document from being destroyed in time.
69
70 if (evaluationContext.hadTypeConversionError)
71 return Exception { SyntaxError };
72
73 if (type != XPathResult::ANY_TYPE) {
74 auto convertToResult = result->convertTo(type);
75 if (convertToResult.hasException())
76 return convertToResult.releaseException();
77 }
78
79 return result;
80}
81
82}
83