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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/v8/ExceptionState.h"
     31 #include "core/dom/Document.h"
     32 #include "core/dom/ExceptionCode.h"
     33 #include "core/xml/XPathEvaluator.h"
     34 
     35 namespace WebCore {
     36 
     37 using namespace XPath;
     38 
     39 XPathResult::XPathResult(Document* document, const Value& value)
     40     : m_value(value)
     41     , m_nodeSetPosition(0)
     42     , m_domTreeVersion(0)
     43 {
     44     ScriptWrappable::init(this);
     45     switch (m_value.type()) {
     46     case Value::BooleanValue:
     47         m_resultType = BOOLEAN_TYPE;
     48         return;
     49     case Value::NumberValue:
     50         m_resultType = NUMBER_TYPE;
     51         return;
     52     case Value::StringValue:
     53         m_resultType = STRING_TYPE;
     54         return;
     55     case Value::NodeSetValue:
     56         m_resultType = UNORDERED_NODE_ITERATOR_TYPE;
     57         m_nodeSetPosition = 0;
     58         m_nodeSet = NodeSet::create(m_value.toNodeSet());
     59         m_document = document;
     60         m_domTreeVersion = document->domTreeVersion();
     61         return;
     62     }
     63     ASSERT_NOT_REACHED();
     64 }
     65 
     66 XPathResult::~XPathResult()
     67 {
     68 }
     69 
     70 void XPathResult::trace(Visitor* visitor)
     71 {
     72     visitor->trace(m_value);
     73     visitor->trace(m_nodeSet);
     74     visitor->trace(m_document);
     75 }
     76 
     77 void XPathResult::convertTo(unsigned short type, ExceptionState& exceptionState)
     78 {
     79     switch (type) {
     80     case ANY_TYPE:
     81         break;
     82     case NUMBER_TYPE:
     83         m_resultType = type;
     84         m_value = m_value.toNumber();
     85         break;
     86     case STRING_TYPE:
     87         m_resultType = type;
     88         m_value = m_value.toString();
     89         break;
     90     case BOOLEAN_TYPE:
     91         m_resultType = type;
     92         m_value = m_value.toBoolean();
     93         break;
     94     case UNORDERED_NODE_ITERATOR_TYPE:
     95     case UNORDERED_NODE_SNAPSHOT_TYPE:
     96     case ANY_UNORDERED_NODE_TYPE:
     97     // This is correct - singleNodeValue() will take care of ordering.
     98     case FIRST_ORDERED_NODE_TYPE:
     99         if (!m_value.isNodeSet()) {
    100             exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
    101             return;
    102         }
    103         m_resultType = type;
    104         break;
    105     case ORDERED_NODE_ITERATOR_TYPE:
    106         if (!m_value.isNodeSet()) {
    107             exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
    108             return;
    109         }
    110         nodeSet().sort();
    111         m_resultType = type;
    112         break;
    113     case ORDERED_NODE_SNAPSHOT_TYPE:
    114         if (!m_value.isNodeSet()) {
    115             exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
    116             return;
    117         }
    118         m_value.toNodeSet().sort();
    119         m_resultType = type;
    120         break;
    121     }
    122 }
    123 
    124 unsigned short XPathResult::resultType() const
    125 {
    126     return m_resultType;
    127 }
    128 
    129 double XPathResult::numberValue(ExceptionState& exceptionState) const
    130 {
    131     if (resultType() != NUMBER_TYPE) {
    132         exceptionState.throwTypeError("The result type is not a number.");
    133         return 0.0;
    134     }
    135     return m_value.toNumber();
    136 }
    137 
    138 String XPathResult::stringValue(ExceptionState& exceptionState) const
    139 {
    140     if (resultType() != STRING_TYPE) {
    141         exceptionState.throwTypeError("The result type is not a string.");
    142         return String();
    143     }
    144     return m_value.toString();
    145 }
    146 
    147 bool XPathResult::booleanValue(ExceptionState& exceptionState) const
    148 {
    149     if (resultType() != BOOLEAN_TYPE) {
    150         exceptionState.throwTypeError("The result type is not a boolean.");
    151         return false;
    152     }
    153     return m_value.toBoolean();
    154 }
    155 
    156 Node* XPathResult::singleNodeValue(ExceptionState& exceptionState) const
    157 {
    158     if (resultType() != ANY_UNORDERED_NODE_TYPE && resultType() != FIRST_ORDERED_NODE_TYPE) {
    159         exceptionState.throwTypeError("The result type is not a single node.");
    160         return 0;
    161     }
    162 
    163     const NodeSet& nodes = m_value.toNodeSet();
    164     if (resultType() == FIRST_ORDERED_NODE_TYPE)
    165         return nodes.firstNode();
    166     return nodes.anyNode();
    167 }
    168 
    169 bool XPathResult::invalidIteratorState() const
    170 {
    171     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE)
    172         return false;
    173 
    174     ASSERT(m_document);
    175     return m_document->domTreeVersion() != m_domTreeVersion;
    176 }
    177 
    178 unsigned long XPathResult::snapshotLength(ExceptionState& exceptionState) const
    179 {
    180     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
    181         exceptionState.throwTypeError("The result type is not a snapshot.");
    182         return 0;
    183     }
    184 
    185     return m_value.toNodeSet().size();
    186 }
    187 
    188 Node* XPathResult::iterateNext(ExceptionState& exceptionState)
    189 {
    190     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE) {
    191         exceptionState.throwTypeError("The result type is not an iterator.");
    192         return 0;
    193     }
    194 
    195     if (invalidIteratorState()) {
    196         exceptionState.throwDOMException(InvalidStateError, "The document has mutated since the result was returned.");
    197         return 0;
    198     }
    199 
    200     if (m_nodeSetPosition + 1 > nodeSet().size())
    201         return 0;
    202 
    203     Node* node = nodeSet()[m_nodeSetPosition];
    204 
    205     m_nodeSetPosition++;
    206 
    207     return node;
    208 }
    209 
    210 Node* XPathResult::snapshotItem(unsigned long index, ExceptionState& exceptionState)
    211 {
    212     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
    213         exceptionState.throwTypeError("The result type is not a snapshot.");
    214         return 0;
    215     }
    216 
    217     const NodeSet& nodes = m_value.toNodeSet();
    218     if (index >= nodes.size())
    219         return 0;
    220 
    221     return nodes[index];
    222 }
    223 
    224 }
    225