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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "qatomictype_p.h" |
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43 #include "qitem_p.h" |
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44 #include "qboolean_p.h" |
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45 #include "qbuiltintypes_p.h" |
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46 #include "qcommonsequencetypes_p.h" |
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47 #include "qcommonvalues_p.h" |
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48 #include "qliteral_p.h" |
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49 |
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50 #include "qcastableas_p.h" |
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51 |
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52 QT_BEGIN_NAMESPACE |
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53 |
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54 using namespace QPatternist; |
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55 |
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56 CastableAs::CastableAs(const Expression::Ptr &operand, |
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57 const SequenceType::Ptr &tType) : SingleContainer(operand), |
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58 m_targetType(tType) |
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59 { |
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60 Q_ASSERT(tType); |
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61 Q_ASSERT(!tType->cardinality().allowsMany()); |
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62 Q_ASSERT(tType->itemType()->isAtomicType()); |
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63 } |
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64 |
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65 bool CastableAs::evaluateEBV(const DynamicContext::Ptr &context) const |
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66 { |
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67 Item item; |
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68 |
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69 if(m_operand->staticType()->cardinality().allowsMany()) |
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70 { |
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71 const Item::Iterator::Ptr it(m_operand->evaluateSequence(context)); |
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72 item = it->next(); |
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73 |
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74 if(it->next()) |
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75 return false; |
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76 } |
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77 else |
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78 item = m_operand->evaluateSingleton(context); |
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79 |
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80 if(item) |
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81 return !cast(item, context).as<AtomicValue>()->hasError(); |
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82 else |
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83 return m_targetType->cardinality().allowsEmpty(); |
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84 } |
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85 |
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86 Expression::Ptr CastableAs::compress(const StaticContext::Ptr &context) |
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87 { |
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88 const Expression::Ptr me(SingleContainer::compress(context)); |
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89 |
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90 if(me != this) /* We already managed to const fold, how convenient. */ |
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91 return me; |
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92 |
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93 const AtomicType::Ptr t(m_targetType->itemType()); |
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94 |
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95 const SequenceType::Ptr opType(m_operand->staticType()); |
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96 |
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97 /* Casting to these always succeeds, assuming the cardinality also matches, |
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98 * although the cardinality can fail. */ |
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99 if(( *t == *BuiltinTypes::xsString |
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100 || *t == *BuiltinTypes::xsUntypedAtomic |
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101 || *t == *opType->itemType()) |
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102 &&(m_targetType->cardinality().isMatch(opType->cardinality()))) |
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103 { |
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104 return wrapLiteral(CommonValues::BooleanTrue, context, this); |
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105 } |
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106 else |
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107 return me; |
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108 } |
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109 |
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110 Expression::Ptr CastableAs::typeCheck(const StaticContext::Ptr &context, |
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111 const SequenceType::Ptr &reqType) |
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112 { |
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113 checkTargetType(context); |
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114 const Expression::Ptr me(SingleContainer::typeCheck(context, reqType)); |
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115 |
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116 return me; |
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117 if(BuiltinTypes::xsQName->xdtTypeMatches(m_targetType->itemType())) |
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118 { |
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119 const SequenceType::Ptr seqt(m_operand->staticType()); |
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120 /* We can cast a string literal, an xs:QName value, and an |
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121 * empty sequence(if empty is allowed), to xs:QName. */ |
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122 if(m_operand->is(IDStringValue) || |
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123 BuiltinTypes::xsQName->xdtTypeMatches(seqt->itemType()) || |
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124 (*seqt->itemType() == *CommonSequenceTypes::Empty && m_targetType->cardinality().allowsEmpty())) |
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125 { |
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126 return wrapLiteral(CommonValues::BooleanTrue, context, this)->typeCheck(context, reqType); |
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127 } |
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128 else |
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129 return wrapLiteral(CommonValues::BooleanFalse, context, this)->typeCheck(context, reqType); |
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130 } |
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131 else |
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132 { |
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133 /* Let the CastingPlatform look up its AtomicCaster. */ |
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134 prepareCasting(context, m_operand->staticType()->itemType()); |
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135 |
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136 return me; |
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137 } |
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138 } |
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139 |
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140 SequenceType::List CastableAs::expectedOperandTypes() const |
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141 { |
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142 SequenceType::List result; |
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143 result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes); |
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144 return result; |
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145 } |
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146 |
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147 SequenceType::Ptr CastableAs::staticType() const |
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148 { |
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149 return CommonSequenceTypes::ExactlyOneBoolean; |
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150 } |
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151 |
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152 ExpressionVisitorResult::Ptr CastableAs::accept(const ExpressionVisitor::Ptr &visitor) const |
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153 { |
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154 return visitor->visit(this); |
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155 } |
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156 |
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157 QT_END_NAMESPACE |