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