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annotate dstep/internal/Traits.d @ 16:19885b43130e

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Huge update, the bridge actually works now
author Jacob Carlborg <doob@me.com>
date Sun, 03 Jan 2010 22:06:11 +0100
parents 033d260cfc9b
children c2fba45df857
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1
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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: Apr 28, 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.internal.Traits;
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8
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9 import dstep.objc.bridge.Bridge;
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10 import dstep.internal.String;
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11
1
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12 /**
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13 * Returns the name of the given function
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14 *
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15 * Params:
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16 * func = the function alias to get the name of
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17 *
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18 * Returns: the name of the function
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19 */
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20 template functionNameOf (alias func)
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21 {
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22 version(LDC)
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23 const functionNameOf = (&func).stringof[1 .. $];
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24
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25 else
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26 const functionNameOf = (&func).stringof[2 .. $];
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27 }
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28
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29 /**
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30 * Returns the parameter names of the given function
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31 *
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32 * Params:
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33 * func = the function alias to get the parameter names of
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34 *
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35 * Returns: an array of strings containing the parameter names
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36 */
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37 template parameterNamesOf (alias func)
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38 {
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39 const parameterNamesOf = parameterNamesOfImpl!(func);
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40 }
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41
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42 private string[] parameterNamesOfImpl (alias func) ()
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43 {
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44 string funcStr = typeof(&func).stringof;
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45
1
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46 auto start = funcStr.indexOf('(');
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47 auto end = funcStr.indexOf(')');
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48
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49 const firstPattern = ' ';
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50 const secondPattern = ',';
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51
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52 funcStr = funcStr[start + 1 .. end];
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53
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54 if (funcStr == "")
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55 return null;
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56
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57 funcStr ~= secondPattern;
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58
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59 string token;
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60 string[] arr;
1
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61
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62 foreach (c ; funcStr)
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63 {
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64 if (c != firstPattern && c != secondPattern)
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65 token ~= c;
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66
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67 else
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68 {
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69 if (token)
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70 arr ~= token;
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71
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72 token = null;
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73 }
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74 }
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75
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76 if (arr.length == 1)
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77 return arr;
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78
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79 string[] result;
1
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80 bool skip = false;
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81
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82 foreach (str ; arr)
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83 {
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84 skip = !skip;
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85
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86 if (skip)
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87 continue;
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88
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89 result ~= str;
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90 }
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91
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92 return result;
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93 }
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94
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95 /**
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96 * Compile-time function to get the index of the give element.
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97 *
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98 * Performs a linear scan, returning the index of the first occurrence
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99 * of the specified element in the array, or U.max if the array does
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100 * not contain the element.
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101 *
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102 * Params:
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103 * arr = the array to get the index of the element from
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104 * element = the element to find
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105 *
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106 * Returns: the index of the element or size_t.max if the element was not found.
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107 */
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108 private size_t indexOf (T) (T[] arr, T element)
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109 {
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110 static if (is(T == char) || is(T == wchar) || is(T == dchar))
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111 foreach (i, dchar e ; arr)
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112 if (e == element)
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113 return i;
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114
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115 else
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116 foreach (i, e ; arr)
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117 if (e == element)
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118 return i;
1
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119
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120 return size_t.max;
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121 }
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122
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123 /**
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124 * Evaluates to true if $(D_PARAM T) has a instance method with the given name
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125 *
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126 * Params:
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127 * T = the type of the class/struct
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128 * method = the name of the method
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129 */
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130 template hasInstanceMethod (T, string method)
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131 {
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132 const hasInstanceMethod = is(typeof({
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133 T t;
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134 mixin("auto f = &t." ~ method ~ ";");
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135 }));
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136 }
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137
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138 /**
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139 * Evaluates to true if $(D_PARAM T) has a class method with the given name
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140 *
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141 * Params:
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142 * T = the type of the class/struct
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143 * method = the name of the method
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144 */
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145 template hasClassMethod (T, string method)
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146 {
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147 const hasClassMethod = is(typeof({
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148 mixin("auto f = &T." ~ method ~ ";");
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149 }));
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150 }
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151
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152 /**
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153 * Evaluates to true if $(D_PARAM T) has a either a class method or a instance method
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154 * with the given name.
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155 *
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156 * Params:
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157 * T = the type of the class/struct
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158 * method = the name of the method
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159 */
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160 template hasMethod (T, string method)
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161 {
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162 const hasMethod = hasClassMethod!(T, method) || hasInstanceMethod!(T, method);
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163 }
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164
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165 /**
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166 * Evaluates to true if $(D_PARAM T) has a field with the given name
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167 *
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168 * Params:
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169 * T = the type of the class/struct
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170 * field = the name of the field
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171 */
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172 template hasField (T, string field)
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173 {
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174 const hasField = is(typeof({
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175 T t;
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176 mixin("auto f = t." ~ field ~ ";");
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177 }));
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178 }
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179
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180 /// Evaluates to true if $(D_PARAM T) has binded methods
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181 template hasBindedMethods (T)
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182 {
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183 const bool hasBindedMethods = hasField!(T, Bridge.objcClassMethodDeclarationVar) || hasField!(T, Bridge.objcMethodDeclarationVar);
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184 }