1 /*

     2  * Copyright 2005 Frerich Raabe <raabe@kde.org>

     3  * Copyright (C) 2006 Apple Computer, Inc.

     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 "XPathValue.h"

    29 

    30 #if ENABLE(XPATH)

    31 

    32 #include "Node.h"

    33 #include "XPathExpressionNode.h"

    34 #include "XPathUtil.h"

    35 #include <limits>

    36 #include <wtf/MathExtras.h>

    37 #include <wtf/StdLibExtras.h>

    38 

    39 using std::numeric_limits;

    40 

    41 namespace WebCore {

    42 namespace XPath {

    43 

    44 const Value::AdoptTag Value::adopt = {};

    45 

    46 const NodeSet& Value::toNodeSet() const

    47 {

    48     if (!isNodeSet())

    49         Expression::evaluationContext().hadTypeConversionError = true;

    50 

    51     if (!m_data) {

    52         DEFINE_STATIC_LOCAL(NodeSet, emptyNodeSet, ());

    53         return emptyNodeSet;

    54     }

    55 

    56     return m_data->m_nodeSet;

    57 }    

    58 

    59 NodeSet& Value::modifiableNodeSet()

    60 {

    61     if (!isNodeSet())

    62         Expression::evaluationContext().hadTypeConversionError = true;

    63 

    64     if (!m_data)

    65         m_data = ValueData::create();

    66     

    67     m_type = NodeSetValue;

    68     return m_data->m_nodeSet;

    69 }

    70 

    71 bool Value::toBoolean() const

    72 {

    73     switch (m_type) {

    74         case NodeSetValue:

    75             return !m_data->m_nodeSet.isEmpty();

    76         case BooleanValue:

    77             return m_bool;

    78         case NumberValue:

    79             return m_number != 0 && !isnan(m_number);

    80         case StringValue:

    81             return !m_data->m_string.isEmpty();

    82     }

    83     ASSERT_NOT_REACHED();

    84     return false;

    85 }

    86 

    87 double Value::toNumber() const

    88 {

    89     switch (m_type) {

    90         case NodeSetValue:

    91             return Value(toString()).toNumber();

    92         case NumberValue:

    93             return m_number;

    94         case StringValue: {

    95             const String& str = m_data->m_string.simplifyWhiteSpace();

    96 

    97             // String::toDouble() supports exponential notation, which is not allowed in XPath.

    98             unsigned len = str.length();

    99             for (unsigned i = 0; i < len; ++i) {

   100                 UChar c = str[i];

   101                 if (!isASCIIDigit(c) && c != '.'  && c != '-')

   102                     return numeric_limits<double>::quiet_NaN();

   103             }

   104 

   105             bool canConvert;

   106             double value = str.toDouble(&canConvert);

   107             if (canConvert)

   108                 return value;

   109             return numeric_limits<double>::quiet_NaN();

   110         }

   111         case BooleanValue:

   112             return m_bool;

   113     }

   114     ASSERT_NOT_REACHED();

   115     return 0.0;

   116 }

   117 

   118 String Value::toString() const

   119 {

   120     switch (m_type) {

   121         case NodeSetValue:

   122             if (m_data->m_nodeSet.isEmpty()) 

   123                 return "";

   124             return stringValue(m_data->m_nodeSet.firstNode());

   125         case StringValue:

   126             return m_data->m_string;

   127         case NumberValue:

   128             if (isnan(m_number))

   129                 return "NaN";

   130             if (m_number == 0)

   131                 return "0";

   132             if (isinf(m_number))

   133                 return signbit(m_number) ? "-Infinity" : "Infinity";

   134             return String::number(m_number);

   135         case BooleanValue:

   136             return m_bool ? "true" : "false";

   137     }

   138     ASSERT_NOT_REACHED();

   139     return String();

   140 }

   141 

   142 }

   143 }

   144 

   145 #endif // ENABLE(XPATH)