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annotate dstep/objc/bridge/Capsule.d @ 25:b9de51448c6b

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Added an id constructor. Changed the string mixin to a template mixin. Added support for building as a dynamic library
author Jacob Carlborg <doob@me.com>
date Tue, 06 Apr 2010 11:37:27 +0200
parents ab33fc0c3fc1
children
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1 /**
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2 * Copyright: Copyright (c) 2009 Jacob Carlborg.
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3 * Authors: Jacob Carlborg
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4 * Version: Initial created: Feb 3, 2009
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5 * License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0)
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6 */
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7 module dstep.objc.bridge.Capsule;
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8
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9 version (Tango)
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10 {
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11 import tango.core.Memory;
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12 import tango.math.Math : log2;
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13
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14 import tango.core.Traits;
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15 }
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16
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17 else
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18 {
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19 import GC = std.gc : addRoot;
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20 import std.math : log2;
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21 }
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22
25
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23 import dstep.internal.Reflection;
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24 import dstep.internal.String;
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25 import dstep.objc.bridge.Bridge;
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26 import dstep.objc.bridge.Type;
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27 import dstep.objc.bridge.TypeEncoding;
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28 import dstep.objc.bridge.Wrapper;
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29 import dstep.objc.message;
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30 import dstep.objc.objc;
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31 import dstep.objc.runtime;
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32 import bindings = dstep.objc.bindings;
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33
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34 /// Returns the capsule class
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35 Class capsuleClass ()
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36 {
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37 if (!Capsule.capsuleClass)
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38 initCapsuleClass;
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39
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40 return Capsule.capsuleClass;
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41 }
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42
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43 private struct Capsule
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44 {
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45 static Class capsuleClass;
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46
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47 static id create (Object object, Class capsuleClass)
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48 {
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49 id capsule = objc.createInstance(capsuleClass, 0);
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50
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51 Bridge.setDObject(object, capsule);
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52
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53 return capsule;
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54 }
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55
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56 static id description (id self, SEL op)
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57 in
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58 {
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59 assert(isCapsule(self));
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60 }
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61 body
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62 {
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63 if (auto object = decapsule!(Object)(self))
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64 return encapsuleString(object.toString);
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65
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66 objc_super superObject;
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67 superObject.cls = .capsuleClass.getSuperclass;
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68 superObject.receiver = self;
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69
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70 return Bridge.invokeObjcSuperMethod!(id, "description")(&superObject);
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71 }
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72
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73 static hash_t hash (id self, SEL op)
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74 in
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75 {
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76 assert(isCapsule(self));
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77 }
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78 body
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79 {
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80 if (auto object = decapsule!(Object)(self))
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81 return object.toHash;
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82
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83 objc_super superObject;
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84 superObject.cls = .capsuleClass.getSuperclass;
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85 superObject.receiver = self;
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86
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87 return Bridge.invokeObjcSuperMethod!(hash_t, "hash")(&superObject);
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88 }
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89
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90 static bool isEqual (id self, SEL op, Object other)
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91 in
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92 {
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93 assert(isCapsule(self));
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94 }
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95 body
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96 {
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97 if (auto object = decapsule!(Object)(self))
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98 return cast(bool) (object == other);
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99
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100 objc_super superObject;
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101 superObject.cls = .capsuleClass.getSuperclass;
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102 superObject.receiver = self;
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103
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104 return Bridge.invokeObjcSuperMethod!(bool, "isEqual:", Object)(&superObject, other);
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105 }
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106 }
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107
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108 private void initCapsuleClass ()
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109 {
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110 Class superClass = cast(Class) objc.getClass!("NSObject");
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111 Capsule.capsuleClass = objc.allocateClassPair!("D_Object")(superClass, 0);
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112
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113 ubyte alignment = cast(ubyte) log2(Bridge.DObjectType.sizeof);
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114
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115 Capsule.capsuleClass.addIvar!(Bridge.dObjectVar, encode!(Bridge.DObjectType))(Bridge.DObjectType.sizeof, alignment);
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116
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117 Capsule.capsuleClass.addMethod!(encodeCallable!(Capsule.description))(sel.registerName!("description"), cast(IMP) &Capsule.description);
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118 Capsule.capsuleClass.addMethod!(encodeCallable!(Capsule.hash))(sel.registerName!("hash"), cast(IMP) &Capsule.hash);
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119 Capsule.capsuleClass.addMethod!(encodeCallable!(Capsule.isEqual))(sel.registerName!("isEqual"), cast (IMP) &Capsule.isEqual);
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120
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121 objc.registerClassPair(capsuleClass);
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122 }
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123
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124 /**
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125 * Returns $(D_KEYWORD true) if the given Objective-C instance is a capsule
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126 *
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127 * Params:
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128 * instance = the Objective-C instance
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129 *
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130 * Returns: $(D_KEYWORD true) if the given Objective-C instance is a capsule
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131 */
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132 bool isCapsule (id instance)
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133 {
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134 //if (capsule && capsule.isa)
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135 //return capsule.isa.getInstanceVariable!(Bridge.dObjectVar) !is null;
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136
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137 if (instance)
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138 {
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139 Class cls = instance.isa;
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140
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141 while (cls && cls !is capsuleClass)
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142 cls = cls.super_class;
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143
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144 return cls is capsuleClass;
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145 }
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146
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147 return false;
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148 }
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149
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150 /**
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151 * Returns $(D_KEYWORD true) if the given Objective-C class is a capsule
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152 *
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153 * Params:
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154 * cls = the Objective-C class
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155 *
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156 * Returns: true if the given Objective-C class is a capsule
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157 */
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158 bool isCapsule (Class cls)
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159 {
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160 while (cls && cls !is capsuleClass)
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161 cls = cls.super_class;
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162
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163 return cls is capsuleClass;
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164 }
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165
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166 /**
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167 * Encapsulate the value of type $(D_PARAM T) to corresponding Objective-C type $(D_PSYMBOL ObjcType!(T))
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168 *
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169 * Params:
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170 * T = the type of the value
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171 * value = the value to encapsulate
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172 *
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173 * Returns: the encapsulated value
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174 */
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175 ObjcType!(T) encapsule (T) (T value)
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176 {
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177 static if (needsEncapsulation!(T))
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178 {
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179 if (!value)
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180 return null;
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181
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182 if (auto wrapper = cast(ObjcWrapper) value)
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183 return wrapper.objcObject;
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184
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185 static if (is(T == interface))
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186 return Capsule.create(cast(Object) value, capsuleClass);
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187
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188 return Capsule.create(cast(Object) value, capsuleClass);
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189 }
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190
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191 else
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192 return value;
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193 }
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194
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195 /**
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196 * Decapsulate the given Objective-C value of type $(D_PSYMBOL ObjcType!(T)) to corresponding D type $(D_PARAM T).
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197 *
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198 * Params:
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199 * T = the type of the decapsulated value
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200 * value = the value to decapsulate
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201 *
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202 * Returns: the decapsulated value
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203 */
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204 T decapsule (T) (ObjcType!(T) value)
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205 {
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206 static if (needsEncapsulation!(T))
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207 {
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208 static if (is(T : ObjcWrapper))
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209 {
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210 T instance = cast(T) Bridge.getDObject(value);
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211
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212 return instance ? instance : newWrapper!(T)(value);
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213 }
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214
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215 else
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216 return cast(T) Bridge.getDObject(value);
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217 }
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218
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219 else
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220 return value;
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221 }
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222
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223 private T newWrapper (T) (ObjcType!(T) value)
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224 {
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225 auto wrapper = cast(ObjcWrapper) newInstance(T.classinfo);
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226 setValueOfField!("objcObject_")(wrapper, value);
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227 Bridge.setDObject(wrapper, value);
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228
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229 return cast(T) wrapper;
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230 }
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231
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232 private id encapsuleString (string str)
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233 {
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234 enum { NSUTF8StringEncoding = 4 }
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235
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236 return objc.getClass!("NSString").msgSend(sel.registerName!("alloc")).msgSend(sel.registerName!("initWithBytes:length:encoding:"), str.ptr, str.length, NSUTF8StringEncoding);
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237 }