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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 = 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::convertTo(unsigned short type, ExceptionState& exceptionState)
     71 {
     72     switch (type) {
     73         case ANY_TYPE:
     74             break;
     75         case NUMBER_TYPE:
     76             m_resultType = type;
     77             m_value = m_value.toNumber();
     78             break;
     79         case STRING_TYPE:
     80             m_resultType = type;
     81             m_value = m_value.toString();
     82             break;
     83         case BOOLEAN_TYPE:
     84             m_resultType = type;
     85             m_value = m_value.toBoolean();
     86             break;
     87         case UNORDERED_NODE_ITERATOR_TYPE:
     88         case UNORDERED_NODE_SNAPSHOT_TYPE:
     89         case ANY_UNORDERED_NODE_TYPE:
     90         case FIRST_ORDERED_NODE_TYPE: // This is correct - singleNodeValue() will take care of ordering.
     91             if (!m_value.isNodeSet()) {
     92                 exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
     93                 return;
     94             }
     95             m_resultType = type;
     96             break;
     97         case ORDERED_NODE_ITERATOR_TYPE:
     98             if (!m_value.isNodeSet()) {
     99                 exceptionState.throwTypeError("The result is not a node set, and therefore cannot be converted to the desired type.");
    100                 return;
    101             }
    102             m_nodeSet.sort();
    103             m_resultType = type;
    104             break;
    105         case ORDERED_NODE_SNAPSHOT_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             m_value.toNodeSet().sort();
    111             m_resultType = type;
    112             break;
    113     }
    114 }
    115 
    116 unsigned short XPathResult::resultType() const
    117 {
    118     return m_resultType;
    119 }
    120 
    121 double XPathResult::numberValue(ExceptionState& exceptionState) const
    122 {
    123     if (resultType() != NUMBER_TYPE) {
    124         exceptionState.throwTypeError("The result type is not a number.");
    125         return 0.0;
    126     }
    127     return m_value.toNumber();
    128 }
    129 
    130 String XPathResult::stringValue(ExceptionState& exceptionState) const
    131 {
    132     if (resultType() != STRING_TYPE) {
    133         exceptionState.throwTypeError("The result type is not a string.");
    134         return String();
    135     }
    136     return m_value.toString();
    137 }
    138 
    139 bool XPathResult::booleanValue(ExceptionState& exceptionState) const
    140 {
    141     if (resultType() != BOOLEAN_TYPE) {
    142         exceptionState.throwTypeError("The result type is not a boolean.");
    143         return false;
    144     }
    145     return m_value.toBoolean();
    146 }
    147 
    148 Node* XPathResult::singleNodeValue(ExceptionState& exceptionState) const
    149 {
    150     if (resultType() != ANY_UNORDERED_NODE_TYPE && resultType() != FIRST_ORDERED_NODE_TYPE) {
    151         exceptionState.throwTypeError("The result type is not a single node.");
    152         return 0;
    153     }
    154 
    155     const NodeSet& nodes = m_value.toNodeSet();
    156     if (resultType() == FIRST_ORDERED_NODE_TYPE)
    157         return nodes.firstNode();
    158     else
    159         return nodes.anyNode();
    160 }
    161 
    162 bool XPathResult::invalidIteratorState() const
    163 {
    164     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE)
    165         return false;
    166 
    167     ASSERT(m_document);
    168     return m_document->domTreeVersion() != m_domTreeVersion;
    169 }
    170 
    171 unsigned long XPathResult::snapshotLength(ExceptionState& exceptionState) const
    172 {
    173     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
    174         exceptionState.throwTypeError("The result type is not a snapshot.");
    175         return 0;
    176     }
    177 
    178     return m_value.toNodeSet().size();
    179 }
    180 
    181 Node* XPathResult::iterateNext(ExceptionState& exceptionState)
    182 {
    183     if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE) {
    184         exceptionState.throwTypeError("The result type is not an iterator.");
    185         return 0;
    186     }
    187 
    188     if (invalidIteratorState()) {
    189         exceptionState.throwDOMException(InvalidStateError, "The document has mutated since the result was returned.");
    190         return 0;
    191     }
    192 
    193     if (m_nodeSetPosition + 1 > m_nodeSet.size())
    194         return 0;
    195 
    196     Node* node = m_nodeSet[m_nodeSetPosition];
    197 
    198     m_nodeSetPosition++;
    199 
    200     return node;
    201 }
    202 
    203 Node* XPathResult::snapshotItem(unsigned long index, ExceptionState& exceptionState)
    204 {
    205     if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
    206         exceptionState.throwTypeError("The result type is not a snapshot.");
    207         return 0;
    208     }
    209 
    210     const NodeSet& nodes = m_value.toNodeSet();
    211     if (index >= nodes.size())
    212         return 0;
    213 
    214     return nodes[index];
    215 }
    216 
    217 }
    218