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 "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
39namespace blink {
40
41using namespace XPath;
42
43DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(XPathExpression);
44
45XPathExpression::XPathExpression()
46{
47}
48
49PassRefPtrWillBeRawPtr<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
61void XPathExpression::trace(Visitor* visitor)
62{
63    visitor->trace(m_topExpression);
64}
65
66PassRefPtrWillBeRawPtr<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