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      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/XPathResult.h"
     29 
     30 #include "bindings/core/v8/ExceptionState.h"
     31 #include "core/dom/Document.h"
     32 #include "core/dom/ExceptionCode.h"
     33 #include "core/xml/XPathEvaluator.h"
     34 #include "core/xml/XPathExpressionNode.h"
     35 
     36 namespace blink {
     37 
     38 using namespace XPath;
     39 
     40 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(XPathResult);
     41 
     42 XPathResult::XPathResult(EvaluationContext& context, const Value& value)
     43     : m_value(value)
     44     , m_nodeSetPosition(0)
     45     , m_domTreeVersion(0)
     46 {
     47     switch (m_value.type()) {
     48     case Value::BooleanValue:
     49         m_resultType = BOOLEAN_TYPE;
     50         return;
     51     case Value::NumberValue:
     52         m_resultType = NUMBER_TYPE;
     53         return;
     54     case Value::StringValue:
     55         m_resultType = STRING_TYPE;
     56         return;
     57     case Value::NodeSetValue:
     58         m_resultType = UNORDERED_NODE_ITERATOR_TYPE;
     59         m_nodeSetPosition = 0;
     60         m_nodeSet = NodeSet::create(m_value.toNodeSet(&context));
     61         m_document = &context.node->document();
     62         m_domTreeVersion = m_document->domTreeVersion();
     63         return;
     64     }
     65     ASSERT_NOT_REACHED();
     66 }
     67 
     68 void XPathResult::trace(Visitor* visitor)
     69 {
     70     visitor->trace(m_value);
     71     visitor->trace(m_nodeSet);
     72     visitor->trace(m_document);
     73 }
     74 
     75 void XPathResult::convertTo(unsigned short type, ExceptionState& exceptionState)
     76 {
     77     switch (type) {
     78     case ANY_TYPE:
     79         break;
     80     case NUMBER_TYPE:
     81         m_resultType = type;
     82         m_value = m_value.toNumber();
     83         break;
     84     case STRING_TYPE:
     85         m_resultType = type;
     86         m_value = m_value.toString();
     87         break;
     88     case BOOLEAN_TYPE:
     89         m_resultType = type;
     90         m_value = m_value.toBoolean();
     91         break;
     92     case UNORDERED_NODE_ITERATOR_TYPE:
     93     case UNORDERED_NODE_SNAPSHOT_TYPE:
     94     case ANY_UNORDERED_NODE_TYPE:
     95     // This is correct - singleNodeValue() will take care of ordering.
     96     case FIRST_ORDERED_NODE_TYPE:
     97         if (!m_value.isNodeSet()) {
     98             exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
     99             return;
    100         }
    101         m_resultType = type;
    102         break;
    103     case ORDERED_NODE_ITERATOR_TYPE:
    104         if (!m_value.isNodeSet()) {
    105             exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
    106             return;
    107         }
    108         nodeSet().sort();
    109         m_resultType = type;
    110         break;
    111     case ORDERED_NODE_SNAPSHOT_TYPE:
    112         if (!m_value.isNodeSet()) {
    113             exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
    114             return;
    115         }
    116         m_value.toNodeSet(0).sort();
    117         m_resultType = type;
    118         break;
    119     }
    120 }
    121 
    122 unsigned short XPathResult::resultType() const
    123 {
    124     return m_resultType;
    125 }
    126 
    127 double XPathResult::numberValue(ExceptionState& exceptionState) const
    128 {
    129     if (resultType() != NUMBER_TYPE) {
    130         exceptionState.throwTypeError("The result type is not a number.");
    131         return 0.0;
    132     }
    133     return m_value.toNumber();
    134 }
    135 
    136 String XPathResult::stringValue(ExceptionState& exceptionState) const
    137 {
    138     if (resultType() != STRING_TYPE) {
    139         exceptionState.throwTypeError("The result type is not a string.");
    140         return String();
    141     }
    142     return m_value.toString();
    143 }
    144 
    145 bool XPathResult::booleanValue(ExceptionState& exceptionState) const
    146 {
    147     if (resultType() != BOOLEAN_TYPE) {
    148         exceptionState.throwTypeError("The result type is not a boolean.");
    149         return false;
    150     }
    151     return m_value.toBoolean();
    152 }
    153 
    154 Node* XPathResult::singleNodeValue(ExceptionState& exceptionState) const
    155 {
    156     if (resultType() != ANY_UNORDERED_NODE_TYPE && resultType() != FIRST_ORDERED_NODE_TYPE) {
    157         exceptionState.throwTypeError("The result type is not a single node.");
    158         return 0;
    159     }
    160 
    161     const NodeSet& nodes = m_value.toNodeSet(0);
    162     if (resultType() == FIRST_ORDERED_NODE_TYPE)
    163         return nodes.firstNode();
    164     return nodes.anyNode();
    165 }
    166 
    167 bool XPathResult::invalidIteratorState() const
    168 {
    169     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE)
    170         return false;
    171 
    172     ASSERT(m_document);
    173     return m_document->domTreeVersion() != m_domTreeVersion;
    174 }
    175 
    176 unsigned long XPathResult::snapshotLength(ExceptionState& exceptionState) const
    177 {
    178     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
    179         exceptionState.throwTypeError("The result type is not a snapshot.");
    180         return 0;
    181     }
    182 
    183     return m_value.toNodeSet(0).size();
    184 }
    185 
    186 Node* XPathResult::iterateNext(ExceptionState& exceptionState)
    187 {
    188     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE) {
    189         exceptionState.throwTypeError("The result type is not an iterator.");
    190         return 0;
    191     }
    192 
    193     if (invalidIteratorState()) {
    194         exceptionState.throwDOMException(InvalidStateError, "The document has mutated since the result was returned.");
    195         return 0;
    196     }
    197 
    198     if (m_nodeSetPosition + 1 > nodeSet().size())
    199         return 0;
    200 
    201     Node* node = nodeSet()[m_nodeSetPosition];
    202 
    203     m_nodeSetPosition++;
    204 
    205     return node;
    206 }
    207 
    208 Node* XPathResult::snapshotItem(unsigned long index, ExceptionState& exceptionState)
    209 {
    210     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
    211         exceptionState.throwTypeError("The result type is not a snapshot.");
    212         return 0;
    213     }
    214 
    215     const NodeSet& nodes = m_value.toNodeSet(0);
    216     if (index >= nodes.size())
    217         return 0;
    218 
    219     return nodes[index];
    220 }
    221 
    222 }
    223