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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 QtScript 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 "config.h" // compile on Windows |
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43 #include "qscriptstring.h" |
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44 #include "qscriptstring_p.h" |
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45 #include "qscriptengine.h" |
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46 #include "qscriptengine_p.h" |
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47 |
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48 QT_BEGIN_NAMESPACE |
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49 |
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50 /*! |
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51 \since 4.4 |
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52 \class QScriptString |
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53 |
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54 \brief The QScriptString class acts as a handle to "interned" strings in a QScriptEngine. |
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55 |
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56 \ingroup script |
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57 |
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58 |
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59 QScriptString can be used to achieve faster (repeated) |
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60 property getting/setting, and comparison of property names, of |
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61 script objects. |
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62 |
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63 To get a QScriptString representation of a string, pass the string |
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64 to QScriptEngine::toStringHandle(). The typical usage pattern is to |
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65 register one or more pre-defined strings when setting up your script |
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66 environment, then subsequently use the relevant QScriptString as |
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67 argument to e.g. QScriptValue::property(). |
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68 |
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69 Call the toString() function to obtain the string that a |
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70 QScriptString represents. |
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71 */ |
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72 |
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73 /*! |
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74 Constructs an invalid QScriptString. |
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75 */ |
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76 QScriptString::QScriptString() |
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77 : d_ptr(0) |
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78 { |
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79 } |
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80 |
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81 /*! |
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82 Constructs a new QScriptString that is a copy of \a other. |
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83 */ |
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84 QScriptString::QScriptString(const QScriptString &other) |
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85 : d_ptr(other.d_ptr) |
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86 { |
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87 if (d_func() && (d_func()->type == QScriptStringPrivate::StackAllocated)) { |
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88 Q_ASSERT(d_func()->ref != 1); |
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89 d_ptr.detach(); |
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90 d_func()->ref = 1; |
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91 d_func()->type = QScriptStringPrivate::HeapAllocated; |
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92 d_func()->engine->registerScriptString(d_func()); |
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93 } |
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94 } |
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95 |
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96 /*! |
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97 Destroys this QScriptString. |
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98 */ |
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99 QScriptString::~QScriptString() |
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100 { |
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101 Q_D(QScriptString); |
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102 if (d) { |
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103 switch (d->type) { |
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104 case QScriptStringPrivate::StackAllocated: |
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105 Q_ASSERT(d->ref == 1); |
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106 d->ref.ref(); // avoid deletion |
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107 break; |
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108 case QScriptStringPrivate::HeapAllocated: |
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109 if (d->engine && (d->ref == 1)) |
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110 d->engine->unregisterScriptString(d); |
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111 break; |
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112 } |
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113 } |
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114 } |
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115 |
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116 /*! |
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117 Assigns the \a other value to this QScriptString. |
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118 */ |
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119 QScriptString &QScriptString::operator=(const QScriptString &other) |
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120 { |
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121 if (d_func() && d_func()->engine && (d_func()->ref == 1) && (d_func()->type == QScriptStringPrivate::HeapAllocated)) { |
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122 // current d_ptr will be deleted at the assignment below, so unregister it first |
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123 d_func()->engine->unregisterScriptString(d_func()); |
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124 } |
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125 d_ptr = other.d_ptr; |
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126 if (d_func() && (d_func()->type == QScriptStringPrivate::StackAllocated)) { |
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127 Q_ASSERT(d_func()->ref != 1); |
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128 d_ptr.detach(); |
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129 d_func()->ref = 1; |
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130 d_func()->type = QScriptStringPrivate::HeapAllocated; |
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131 d_func()->engine->registerScriptString(d_func()); |
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132 } |
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133 return *this; |
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134 } |
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135 |
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136 /*! |
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137 Returns true if this QScriptString is valid; otherwise |
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138 returns false. |
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139 */ |
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140 bool QScriptString::isValid() const |
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141 { |
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142 return QScriptStringPrivate::isValid(*this); |
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143 } |
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144 |
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145 /*! |
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146 Returns true if this QScriptString is equal to \a other; |
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147 otherwise returns false. |
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148 */ |
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149 bool QScriptString::operator==(const QScriptString &other) const |
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150 { |
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151 Q_D(const QScriptString); |
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152 if (!d || !other.d_func()) |
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153 return d == other.d_func(); |
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154 return d->identifier == other.d_func()->identifier; |
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155 } |
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156 |
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157 /*! |
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158 Returns true if this QScriptString is not equal to \a other; |
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159 otherwise returns false. |
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160 */ |
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161 bool QScriptString::operator!=(const QScriptString &other) const |
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162 { |
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163 return !operator==(other); |
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164 } |
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165 |
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166 /*! |
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167 Returns the string that this QScriptString represents, or a |
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168 null string if this QScriptString is not valid. |
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169 |
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170 \sa isValid() |
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171 */ |
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172 QString QScriptString::toString() const |
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173 { |
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174 Q_D(const QScriptString); |
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175 if (!d || !d->engine) |
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176 return QString(); |
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177 return d->identifier.ustring(); |
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178 } |
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179 |
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180 /*! |
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181 Returns the string that this QScriptString represents, or a |
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182 null string if this QScriptString is not valid. |
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183 |
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184 \sa toString() |
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185 */ |
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186 QScriptString::operator QString() const |
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187 { |
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188 return toString(); |
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189 } |
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190 |
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191 uint qHash(const QScriptString &key) |
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192 { |
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193 QScriptStringPrivate *d = QScriptStringPrivate::get(key); |
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194 if (!d) |
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195 return 0; |
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196 return qHash(d->identifier.ustring().rep()); |
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197 } |
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198 |
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199 QT_END_NAMESPACE |