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      1 /*
      2  * Copyright 2005 Frerich Raabe <raabe (at) 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 "core/xml/XPathValue.h"
     29 
     30 #include "core/xml/XPathExpressionNode.h"
     31 #include "core/xml/XPathUtil.h"
     32 #include "wtf/MathExtras.h"
     33 #include "wtf/StdLibExtras.h"
     34 #include <limits>
     35 
     36 namespace WebCore {
     37 namespace XPath {
     38 
     39 const Value::AdoptTag Value::adopt = { };
     40 
     41 void ValueData::trace(Visitor* visitor)
     42 {
     43     visitor->trace(m_nodeSet);
     44 }
     45 
     46 void Value::trace(Visitor* visitor)
     47 {
     48     visitor->trace(m_data);
     49 }
     50 
     51 const NodeSet& Value::toNodeSet() const
     52 {
     53     if (!isNodeSet())
     54         Expression::evaluationContext().hadTypeConversionError = true;
     55 
     56     if (!m_data) {
     57         DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<NodeSet>, emptyNodeSet, (NodeSet::create()));
     58         return *emptyNodeSet;
     59     }
     60 
     61     return m_data->nodeSet();
     62 }
     63 
     64 NodeSet& Value::modifiableNodeSet()
     65 {
     66     if (!isNodeSet())
     67         Expression::evaluationContext().hadTypeConversionError = true;
     68 
     69     if (!m_data)
     70         m_data = ValueData::create();
     71 
     72     m_type = NodeSetValue;
     73     return m_data->nodeSet();
     74 }
     75 
     76 bool Value::toBoolean() const
     77 {
     78     switch (m_type) {
     79     case NodeSetValue:
     80         return !m_data->nodeSet().isEmpty();
     81     case BooleanValue:
     82         return m_bool;
     83     case NumberValue:
     84         return m_number && !std::isnan(m_number);
     85     case StringValue:
     86         return !m_data->m_string.isEmpty();
     87     }
     88     ASSERT_NOT_REACHED();
     89     return false;
     90 }
     91 
     92 double Value::toNumber() const
     93 {
     94     switch (m_type) {
     95     case NodeSetValue:
     96         return Value(toString()).toNumber();
     97     case NumberValue:
     98         return m_number;
     99     case StringValue: {
    100         const String& str = m_data->m_string.simplifyWhiteSpace();
    101 
    102         // String::toDouble() supports exponential notation, which is not
    103         // allowed in XPath.
    104         unsigned len = str.length();
    105         for (unsigned i = 0; i < len; ++i) {
    106             UChar c = str[i];
    107             if (!isASCIIDigit(c) && c != '.'  && c != '-')
    108                 return std::numeric_limits<double>::quiet_NaN();
    109         }
    110 
    111         bool canConvert;
    112         double value = str.toDouble(&canConvert);
    113         if (canConvert)
    114             return value;
    115         return std::numeric_limits<double>::quiet_NaN();
    116     }
    117     case BooleanValue:
    118         return m_bool;
    119     }
    120     ASSERT_NOT_REACHED();
    121     return 0.0;
    122 }
    123 
    124 String Value::toString() const
    125 {
    126     switch (m_type) {
    127     case NodeSetValue:
    128         if (m_data->nodeSet().isEmpty())
    129             return "";
    130         return stringValue(m_data->nodeSet().firstNode());
    131     case StringValue:
    132         return m_data->m_string;
    133     case NumberValue:
    134         if (std::isnan(m_number))
    135             return "NaN";
    136         if (m_number == 0)
    137             return "0";
    138         if (std::isinf(m_number))
    139             return std::signbit(m_number) ? "-Infinity" : "Infinity";
    140         return String::number(m_number);
    141     case BooleanValue:
    142         return m_bool ? "true" : "false";
    143     }
    144     ASSERT_NOT_REACHED();
    145     return String();
    146 }
    147 
    148 }
    149 }
    150