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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 "qbuiltintypes_p.h" |
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43 #include "qcommonsequencetypes_p.h" |
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44 #include "qcurrentitemcontext_p.h" |
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45 #include "qstaticcurrentcontext_p.h" |
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46 |
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47 #include "qcurrentitemstore_p.h" |
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48 |
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49 QT_BEGIN_NAMESPACE |
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50 |
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51 using namespace QPatternist; |
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52 |
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53 CurrentItemStore::CurrentItemStore(const Expression::Ptr &operand) : SingleContainer(operand) |
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54 { |
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55 } |
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56 |
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57 DynamicContext::Ptr CurrentItemStore::createContext(const DynamicContext::Ptr &old) const |
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58 { |
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59 return DynamicContext::Ptr(new CurrentItemContext(old->contextItem(), old)); |
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60 } |
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61 |
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62 bool CurrentItemStore::evaluateEBV(const DynamicContext::Ptr &context) const |
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63 { |
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64 return m_operand->evaluateEBV(createContext(context)); |
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65 } |
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66 |
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67 Item::Iterator::Ptr CurrentItemStore::evaluateSequence(const DynamicContext::Ptr &context) const |
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68 { |
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69 return m_operand->evaluateSequence(createContext(context)); |
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70 } |
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71 |
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72 Item CurrentItemStore::evaluateSingleton(const DynamicContext::Ptr &context) const |
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73 { |
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74 return m_operand->evaluateSingleton(createContext(context)); |
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75 } |
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76 |
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77 SequenceType::Ptr CurrentItemStore::staticType() const |
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78 { |
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79 return m_operand->staticType(); |
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80 } |
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81 |
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82 SequenceType::List CurrentItemStore::expectedOperandTypes() const |
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83 { |
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84 SequenceType::List result; |
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85 result.append(CommonSequenceTypes::ZeroOrMoreItems); |
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86 return result; |
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87 } |
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88 |
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89 StaticContext::Ptr CurrentItemStore::newStaticContext(const StaticContext::Ptr &context) |
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90 { |
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91 /* It might be we are generated despite there is no focus. In that case |
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92 * an error will reported in case current() is used, but in any case we cannot |
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93 * crash, so use item() in case we have no focus. |
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94 * |
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95 * Such a case is when we're inside a named template, and it's invoked |
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96 * without focus. */ |
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97 const ItemType::Ptr t(context->contextItemType()); |
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98 return StaticContext::Ptr(new StaticCurrentContext(t ? t : BuiltinTypes::item, context)); |
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99 } |
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100 |
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101 Expression::Ptr CurrentItemStore::compress(const StaticContext::Ptr &context) |
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102 { |
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103 const Expression::Ptr me(SingleContainer::compress(newStaticContext(context))); |
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104 |
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105 if(me != this) |
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106 return me; |
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107 else |
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108 { |
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109 /* If fn:current() isn't called, there's no point in us sticking |
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110 * around. */ |
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111 if(m_operand->deepProperties().testFlag(RequiresCurrentItem)) |
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112 return me; |
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113 else |
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114 return m_operand; |
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115 } |
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116 } |
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117 |
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118 Expression::Ptr CurrentItemStore::typeCheck(const StaticContext::Ptr &context, |
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119 const SequenceType::Ptr &reqType) |
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120 { |
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121 return SingleContainer::typeCheck(newStaticContext(context), reqType); |
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122 } |
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123 |
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124 ExpressionVisitorResult::Ptr CurrentItemStore::accept(const ExpressionVisitor::Ptr &visitor) const |
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125 { |
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126 return visitor->visit(this); |
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127 } |
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128 |
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129 const SourceLocationReflection *CurrentItemStore::actualReflection() const |
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130 { |
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131 return m_operand->actualReflection(); |
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132 } |
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133 |
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134 Expression::Properties CurrentItemStore::properties() const |
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135 { |
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136 return m_operand->properties() & (RequiresFocus | IsEvaluated | DisableElimination); |
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137 } |
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138 |
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139 QT_END_NAMESPACE |