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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 |
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43 #include "qcontextitem_p.h" |
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44 #include "qcommonsequencetypes_p.h" |
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45 #include "qemptysequence_p.h" |
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46 #include "qfunctionsignature_p.h" |
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47 #include "qgenericsequencetype_p.h" |
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48 #include "qcollationchecker_p.h" |
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49 #include "qcommonnamespaces_p.h" |
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50 |
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51 #include "qfunctioncall_p.h" |
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52 |
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53 QT_BEGIN_NAMESPACE |
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54 |
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55 using namespace QPatternist; |
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56 |
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57 SequenceType::List FunctionCall::expectedOperandTypes() const |
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58 { |
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59 const FunctionArgument::List args(signature()->arguments()); |
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60 FunctionArgument::List::const_iterator it(args.constBegin()); |
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61 const FunctionArgument::List::const_iterator end(args.constEnd()); |
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62 // TODO reserve/resize() |
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63 SequenceType::List result; |
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64 |
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65 for(; it != end; ++it) |
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66 result.append((*it)->type()); |
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67 |
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68 return result; |
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69 } |
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70 |
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71 Expression::Ptr FunctionCall::typeCheck(const StaticContext::Ptr &context, |
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72 const SequenceType::Ptr &reqType) |
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73 { |
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74 /* We don't cache properties() at some stages because it can be invalidated |
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75 * by the typeCheck(). */ |
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76 |
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77 const FunctionSignature::Arity maxArgs = signature()->maximumArguments(); |
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78 /* We do this before the typeCheck() such that the appropriate conversions |
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79 * are applied to the ContextItem. */ |
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80 if(m_operands.count() < maxArgs && |
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81 has(UseContextItem)) |
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82 { |
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83 m_operands.append(Expression::Ptr(new ContextItem())); |
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84 context->wrapExpressionWith(this, m_operands.last()); |
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85 } |
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86 |
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87 const Expression::Ptr me(UnlimitedContainer::typeCheck(context, reqType)); |
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88 if(me != this) |
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89 return me; |
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90 |
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91 const Properties props(properties()); |
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92 |
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93 if(props.testFlag(RewriteToEmptyOnEmpty) && |
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94 *CommonSequenceTypes::Empty == *m_operands.first()->staticType()->itemType()) |
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95 { |
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96 return EmptySequence::create(this, context); |
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97 } |
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98 |
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99 if(props.testFlag(LastOperandIsCollation) && |
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100 m_operands.count() == maxArgs) |
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101 { |
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102 m_operands.last() = Expression::Ptr(new CollationChecker(m_operands.last())); |
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103 context->wrapExpressionWith(this, m_operands.last()); |
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104 } |
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105 |
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106 return me; |
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107 } |
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108 |
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109 void FunctionCall::setSignature(const FunctionSignature::Ptr &sign) |
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110 { |
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111 m_signature = sign; |
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112 } |
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113 |
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114 FunctionSignature::Ptr FunctionCall::signature() const |
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115 { |
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116 Q_ASSERT(m_signature); /* It really should be set. */ |
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117 return m_signature; |
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118 } |
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119 |
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120 SequenceType::Ptr FunctionCall::staticType() const |
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121 { |
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122 Q_ASSERT(m_signature); |
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123 if(has(EmptynessFollowsChild)) |
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124 { |
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125 if(m_operands.isEmpty()) |
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126 { |
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127 /* This is a function which uses the context item when having no arguments. */ |
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128 return signature()->returnType(); |
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129 } |
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130 const Cardinality card(m_operands.first()->staticType()->cardinality()); |
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131 if(card.allowsEmpty()) |
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132 return signature()->returnType(); |
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133 else |
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134 { |
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135 /* Remove empty. */ |
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136 return makeGenericSequenceType(signature()->returnType()->itemType(), |
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137 card & Cardinality::oneOrMore()); |
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138 } |
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139 } |
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140 return signature()->returnType(); |
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141 } |
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142 |
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143 Expression::Properties FunctionCall::properties() const |
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144 { |
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145 Q_ASSERT(m_signature); |
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146 return signature()->properties(); |
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147 } |
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148 |
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149 ExpressionVisitorResult::Ptr FunctionCall::accept(const ExpressionVisitor::Ptr &visitor) const |
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150 { |
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151 return visitor->visit(this); |
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152 } |
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153 |
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154 Expression::ID FunctionCall::id() const |
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155 { |
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156 Q_ASSERT(m_signature); |
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157 return m_signature->id(); |
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158 } |
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159 |
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160 QT_END_NAMESPACE |