1 | // Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team |
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2 | // |
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3 | // Permission is hereby granted, free of charge, to any person obtaining a copy of this |
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4 | // software and associated documentation files (the "Software"), to deal in the Software |
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5 | // without restriction, including without limitation the rights to use, copy, modify, merge, |
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6 | // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons |
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7 | // to whom the Software is furnished to do so, subject to the following conditions: |
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8 | // |
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9 | // The above copyright notice and this permission notice shall be included in all copies or |
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10 | // substantial portions of the Software. |
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11 | // |
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12 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
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13 | // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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14 | // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE |
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15 | // FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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16 | // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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17 | // DEALINGS IN THE SOFTWARE. |
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18 | |
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19 | using System; |
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20 | |
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21 | namespace ICSharpCode.NRefactory.Utils |
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22 | { |
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23 | /// <summary> |
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24 | /// Static helper method for converting between primitive types. |
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25 | /// </summary> |
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26 | public static class CSharpPrimitiveCast |
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27 | { |
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28 | /// <summary> |
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29 | /// Performs a conversion between primitive types. |
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30 | /// Unfortunately we cannot use Convert.ChangeType because it has different semantics |
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31 | /// (e.g. rounding behavior for floats, overflow, etc.), so we write down every possible primitive C# cast |
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32 | /// and let the compiler figure out the exact semantics. |
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33 | /// And we have to do everything twice, once in a checked-block, once in an unchecked-block. |
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34 | /// </summary> |
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35 | /// <exception cref="OverflowException">Overflow checking is enabled and an overflow occurred.</exception> |
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36 | /// <exception cref="InvalidCastException">The cast is invalid, e.g. casting a boolean to an integer.</exception> |
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37 | public static object Cast(TypeCode targetType, object input, bool checkForOverflow) |
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38 | { |
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39 | if (input == null) |
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40 | return null; |
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41 | if (checkForOverflow) |
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42 | return CSharpPrimitiveCastChecked(targetType, input); |
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43 | else |
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44 | return CSharpPrimitiveCastUnchecked(targetType, input); |
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45 | } |
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46 | |
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47 | static object CSharpPrimitiveCastChecked(TypeCode targetType, object input) |
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48 | { |
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49 | checked { |
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50 | TypeCode sourceType = Type.GetTypeCode(input.GetType()); |
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51 | if (sourceType == targetType) |
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52 | return input; |
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53 | switch (targetType) { |
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54 | case TypeCode.Char: |
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55 | switch (sourceType) { |
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56 | case TypeCode.SByte: return (char)(sbyte)input; |
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57 | case TypeCode.Byte: return (char)(byte)input; |
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58 | case TypeCode.Int16: return (char)(short)input; |
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59 | case TypeCode.UInt16: return (char)(ushort)input; |
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60 | case TypeCode.Int32: return (char)(int)input; |
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61 | case TypeCode.UInt32: return (char)(uint)input; |
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62 | case TypeCode.Int64: return (char)(long)input; |
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63 | case TypeCode.UInt64: return (char)(ulong)input; |
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64 | case TypeCode.Single: return (char)(float)input; |
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65 | case TypeCode.Double: return (char)(double)input; |
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66 | case TypeCode.Decimal: return (char)(decimal)input; |
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67 | } |
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68 | break; |
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69 | case TypeCode.SByte: |
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70 | switch (sourceType) { |
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71 | case TypeCode.Char: return (sbyte)(char)input; |
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72 | case TypeCode.Byte: return (sbyte)(byte)input; |
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73 | case TypeCode.Int16: return (sbyte)(short)input; |
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74 | case TypeCode.UInt16: return (sbyte)(ushort)input; |
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75 | case TypeCode.Int32: return (sbyte)(int)input; |
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76 | case TypeCode.UInt32: return (sbyte)(uint)input; |
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77 | case TypeCode.Int64: return (sbyte)(long)input; |
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78 | case TypeCode.UInt64: return (sbyte)(ulong)input; |
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79 | case TypeCode.Single: return (sbyte)(float)input; |
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80 | case TypeCode.Double: return (sbyte)(double)input; |
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81 | case TypeCode.Decimal: return (sbyte)(decimal)input; |
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82 | } |
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83 | break; |
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84 | case TypeCode.Byte: |
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85 | switch (sourceType) { |
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86 | case TypeCode.Char: return (byte)(char)input; |
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87 | case TypeCode.SByte: return (byte)(sbyte)input; |
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88 | case TypeCode.Int16: return (byte)(short)input; |
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89 | case TypeCode.UInt16: return (byte)(ushort)input; |
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90 | case TypeCode.Int32: return (byte)(int)input; |
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91 | case TypeCode.UInt32: return (byte)(uint)input; |
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92 | case TypeCode.Int64: return (byte)(long)input; |
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93 | case TypeCode.UInt64: return (byte)(ulong)input; |
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94 | case TypeCode.Single: return (byte)(float)input; |
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95 | case TypeCode.Double: return (byte)(double)input; |
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96 | case TypeCode.Decimal: return (byte)(decimal)input; |
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97 | } |
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98 | break; |
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99 | case TypeCode.Int16: |
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100 | switch (sourceType) { |
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101 | case TypeCode.Char: return (short)(char)input; |
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102 | case TypeCode.SByte: return (short)(sbyte)input; |
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103 | case TypeCode.Byte: return (short)(byte)input; |
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104 | case TypeCode.UInt16: return (short)(ushort)input; |
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105 | case TypeCode.Int32: return (short)(int)input; |
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106 | case TypeCode.UInt32: return (short)(uint)input; |
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107 | case TypeCode.Int64: return (short)(long)input; |
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108 | case TypeCode.UInt64: return (short)(ulong)input; |
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109 | case TypeCode.Single: return (short)(float)input; |
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110 | case TypeCode.Double: return (short)(double)input; |
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111 | case TypeCode.Decimal: return (short)(decimal)input; |
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112 | } |
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113 | break; |
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114 | case TypeCode.UInt16: |
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115 | switch (sourceType) { |
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116 | case TypeCode.Char: return (ushort)(char)input; |
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117 | case TypeCode.SByte: return (ushort)(sbyte)input; |
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118 | case TypeCode.Byte: return (ushort)(byte)input; |
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119 | case TypeCode.Int16: return (ushort)(short)input; |
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120 | case TypeCode.Int32: return (ushort)(int)input; |
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121 | case TypeCode.UInt32: return (ushort)(uint)input; |
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122 | case TypeCode.Int64: return (ushort)(long)input; |
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123 | case TypeCode.UInt64: return (ushort)(ulong)input; |
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124 | case TypeCode.Single: return (ushort)(float)input; |
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125 | case TypeCode.Double: return (ushort)(double)input; |
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126 | case TypeCode.Decimal: return (ushort)(decimal)input; |
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127 | } |
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128 | break; |
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129 | case TypeCode.Int32: |
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130 | switch (sourceType) { |
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131 | case TypeCode.Char: return (int)(char)input; |
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132 | case TypeCode.SByte: return (int)(sbyte)input; |
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133 | case TypeCode.Byte: return (int)(byte)input; |
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134 | case TypeCode.Int16: return (int)(short)input; |
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135 | case TypeCode.UInt16: return (int)(ushort)input; |
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136 | case TypeCode.UInt32: return (int)(uint)input; |
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137 | case TypeCode.Int64: return (int)(long)input; |
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138 | case TypeCode.UInt64: return (int)(ulong)input; |
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139 | case TypeCode.Single: return (int)(float)input; |
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140 | case TypeCode.Double: return (int)(double)input; |
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141 | case TypeCode.Decimal: return (int)(decimal)input; |
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142 | } |
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143 | break; |
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144 | case TypeCode.UInt32: |
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145 | switch (sourceType) { |
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146 | case TypeCode.Char: return (uint)(char)input; |
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147 | case TypeCode.SByte: return (uint)(sbyte)input; |
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148 | case TypeCode.Byte: return (uint)(byte)input; |
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149 | case TypeCode.Int16: return (uint)(short)input; |
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150 | case TypeCode.UInt16: return (uint)(ushort)input; |
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151 | case TypeCode.Int32: return (uint)(int)input; |
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152 | case TypeCode.Int64: return (uint)(long)input; |
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153 | case TypeCode.UInt64: return (uint)(ulong)input; |
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154 | case TypeCode.Single: return (uint)(float)input; |
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155 | case TypeCode.Double: return (uint)(double)input; |
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156 | case TypeCode.Decimal: return (uint)(decimal)input; |
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157 | } |
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158 | break; |
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159 | case TypeCode.Int64: |
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160 | switch (sourceType) { |
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161 | case TypeCode.Char: return (long)(char)input; |
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162 | case TypeCode.SByte: return (long)(sbyte)input; |
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163 | case TypeCode.Byte: return (long)(byte)input; |
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164 | case TypeCode.Int16: return (long)(short)input; |
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165 | case TypeCode.UInt16: return (long)(ushort)input; |
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166 | case TypeCode.Int32: return (long)(int)input; |
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167 | case TypeCode.UInt32: return (long)(uint)input; |
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168 | case TypeCode.UInt64: return (long)(ulong)input; |
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169 | case TypeCode.Single: return (long)(float)input; |
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170 | case TypeCode.Double: return (long)(double)input; |
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171 | case TypeCode.Decimal: return (long)(decimal)input; |
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172 | } |
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173 | break; |
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174 | case TypeCode.UInt64: |
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175 | switch (sourceType) { |
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176 | case TypeCode.Char: return (ulong)(char)input; |
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177 | case TypeCode.SByte: return (ulong)(sbyte)input; |
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178 | case TypeCode.Byte: return (ulong)(byte)input; |
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179 | case TypeCode.Int16: return (ulong)(short)input; |
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180 | case TypeCode.UInt16: return (ulong)(ushort)input; |
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181 | case TypeCode.Int32: return (ulong)(int)input; |
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182 | case TypeCode.UInt32: return (ulong)(uint)input; |
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183 | case TypeCode.Int64: return (ulong)(long)input; |
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184 | case TypeCode.Single: return (ulong)(float)input; |
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185 | case TypeCode.Double: return (ulong)(double)input; |
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186 | case TypeCode.Decimal: return (ulong)(decimal)input; |
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187 | } |
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188 | break; |
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189 | case TypeCode.Single: |
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190 | switch (sourceType) { |
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191 | case TypeCode.Char: return (float)(char)input; |
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192 | case TypeCode.SByte: return (float)(sbyte)input; |
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193 | case TypeCode.Byte: return (float)(byte)input; |
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194 | case TypeCode.Int16: return (float)(short)input; |
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195 | case TypeCode.UInt16: return (float)(ushort)input; |
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196 | case TypeCode.Int32: return (float)(int)input; |
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197 | case TypeCode.UInt32: return (float)(uint)input; |
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198 | case TypeCode.Int64: return (float)(long)input; |
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199 | case TypeCode.UInt64: return (float)(ulong)input; |
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200 | case TypeCode.Double: return (float)(double)input; |
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201 | case TypeCode.Decimal: return (float)(decimal)input; |
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202 | } |
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203 | break; |
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204 | case TypeCode.Double: |
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205 | switch (sourceType) { |
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206 | case TypeCode.Char: return (double)(char)input; |
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207 | case TypeCode.SByte: return (double)(sbyte)input; |
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208 | case TypeCode.Byte: return (double)(byte)input; |
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209 | case TypeCode.Int16: return (double)(short)input; |
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210 | case TypeCode.UInt16: return (double)(ushort)input; |
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211 | case TypeCode.Int32: return (double)(int)input; |
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212 | case TypeCode.UInt32: return (double)(uint)input; |
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213 | case TypeCode.Int64: return (double)(long)input; |
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214 | case TypeCode.UInt64: return (double)(ulong)input; |
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215 | case TypeCode.Single: return (double)(float)input; |
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216 | case TypeCode.Decimal: return (double)(decimal)input; |
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217 | } |
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218 | break; |
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219 | case TypeCode.Decimal: |
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220 | switch (sourceType) { |
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221 | case TypeCode.Char: return (decimal)(char)input; |
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222 | case TypeCode.SByte: return (decimal)(sbyte)input; |
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223 | case TypeCode.Byte: return (decimal)(byte)input; |
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224 | case TypeCode.Int16: return (decimal)(short)input; |
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225 | case TypeCode.UInt16: return (decimal)(ushort)input; |
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226 | case TypeCode.Int32: return (decimal)(int)input; |
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227 | case TypeCode.UInt32: return (decimal)(uint)input; |
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228 | case TypeCode.Int64: return (decimal)(long)input; |
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229 | case TypeCode.UInt64: return (decimal)(ulong)input; |
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230 | case TypeCode.Single: return (decimal)(float)input; |
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231 | case TypeCode.Double: return (decimal)(double)input; |
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232 | } |
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233 | break; |
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234 | } |
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235 | throw new InvalidCastException("Cast from " + sourceType + " to " + targetType + "not supported."); |
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236 | } |
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237 | } |
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238 | |
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239 | static object CSharpPrimitiveCastUnchecked(TypeCode targetType, object input) |
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240 | { |
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241 | unchecked { |
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242 | TypeCode sourceType = Type.GetTypeCode(input.GetType()); |
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243 | if (sourceType == targetType) |
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244 | return input; |
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245 | switch (targetType) { |
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246 | case TypeCode.Char: |
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247 | switch (sourceType) { |
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248 | case TypeCode.SByte: return (char)(sbyte)input; |
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249 | case TypeCode.Byte: return (char)(byte)input; |
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250 | case TypeCode.Int16: return (char)(short)input; |
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251 | case TypeCode.UInt16: return (char)(ushort)input; |
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252 | case TypeCode.Int32: return (char)(int)input; |
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253 | case TypeCode.UInt32: return (char)(uint)input; |
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254 | case TypeCode.Int64: return (char)(long)input; |
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255 | case TypeCode.UInt64: return (char)(ulong)input; |
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256 | case TypeCode.Single: return (char)(float)input; |
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257 | case TypeCode.Double: return (char)(double)input; |
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258 | case TypeCode.Decimal: return (char)(decimal)input; |
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259 | } |
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260 | break; |
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261 | case TypeCode.SByte: |
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262 | switch (sourceType) { |
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263 | case TypeCode.Char: return (sbyte)(char)input; |
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264 | case TypeCode.Byte: return (sbyte)(byte)input; |
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265 | case TypeCode.Int16: return (sbyte)(short)input; |
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266 | case TypeCode.UInt16: return (sbyte)(ushort)input; |
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267 | case TypeCode.Int32: return (sbyte)(int)input; |
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268 | case TypeCode.UInt32: return (sbyte)(uint)input; |
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269 | case TypeCode.Int64: return (sbyte)(long)input; |
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270 | case TypeCode.UInt64: return (sbyte)(ulong)input; |
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271 | case TypeCode.Single: return (sbyte)(float)input; |
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272 | case TypeCode.Double: return (sbyte)(double)input; |
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273 | case TypeCode.Decimal: return (sbyte)(decimal)input; |
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274 | } |
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275 | break; |
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276 | case TypeCode.Byte: |
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277 | switch (sourceType) { |
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278 | case TypeCode.Char: return (byte)(char)input; |
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279 | case TypeCode.SByte: return (byte)(sbyte)input; |
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280 | case TypeCode.Int16: return (byte)(short)input; |
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281 | case TypeCode.UInt16: return (byte)(ushort)input; |
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282 | case TypeCode.Int32: return (byte)(int)input; |
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283 | case TypeCode.UInt32: return (byte)(uint)input; |
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284 | case TypeCode.Int64: return (byte)(long)input; |
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285 | case TypeCode.UInt64: return (byte)(ulong)input; |
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286 | case TypeCode.Single: return (byte)(float)input; |
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287 | case TypeCode.Double: return (byte)(double)input; |
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288 | case TypeCode.Decimal: return (byte)(decimal)input; |
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289 | } |
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290 | break; |
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291 | case TypeCode.Int16: |
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292 | switch (sourceType) { |
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293 | case TypeCode.Char: return (short)(char)input; |
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294 | case TypeCode.SByte: return (short)(sbyte)input; |
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295 | case TypeCode.Byte: return (short)(byte)input; |
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296 | case TypeCode.UInt16: return (short)(ushort)input; |
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297 | case TypeCode.Int32: return (short)(int)input; |
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298 | case TypeCode.UInt32: return (short)(uint)input; |
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299 | case TypeCode.Int64: return (short)(long)input; |
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300 | case TypeCode.UInt64: return (short)(ulong)input; |
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301 | case TypeCode.Single: return (short)(float)input; |
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302 | case TypeCode.Double: return (short)(double)input; |
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303 | case TypeCode.Decimal: return (short)(decimal)input; |
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304 | } |
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305 | break; |
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306 | case TypeCode.UInt16: |
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307 | switch (sourceType) { |
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308 | case TypeCode.Char: return (ushort)(char)input; |
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309 | case TypeCode.SByte: return (ushort)(sbyte)input; |
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310 | case TypeCode.Byte: return (ushort)(byte)input; |
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311 | case TypeCode.Int16: return (ushort)(short)input; |
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312 | case TypeCode.Int32: return (ushort)(int)input; |
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313 | case TypeCode.UInt32: return (ushort)(uint)input; |
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314 | case TypeCode.Int64: return (ushort)(long)input; |
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315 | case TypeCode.UInt64: return (ushort)(ulong)input; |
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316 | case TypeCode.Single: return (ushort)(float)input; |
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317 | case TypeCode.Double: return (ushort)(double)input; |
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318 | case TypeCode.Decimal: return (ushort)(decimal)input; |
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319 | } |
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320 | break; |
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321 | case TypeCode.Int32: |
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322 | switch (sourceType) { |
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323 | case TypeCode.Char: return (int)(char)input; |
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324 | case TypeCode.SByte: return (int)(sbyte)input; |
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325 | case TypeCode.Byte: return (int)(byte)input; |
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326 | case TypeCode.Int16: return (int)(short)input; |
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327 | case TypeCode.UInt16: return (int)(ushort)input; |
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328 | case TypeCode.UInt32: return (int)(uint)input; |
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329 | case TypeCode.Int64: return (int)(long)input; |
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330 | case TypeCode.UInt64: return (int)(ulong)input; |
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331 | case TypeCode.Single: return (int)(float)input; |
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332 | case TypeCode.Double: return (int)(double)input; |
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333 | case TypeCode.Decimal: return (int)(decimal)input; |
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334 | } |
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335 | break; |
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336 | case TypeCode.UInt32: |
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337 | switch (sourceType) { |
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338 | case TypeCode.Char: return (uint)(char)input; |
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339 | case TypeCode.SByte: return (uint)(sbyte)input; |
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340 | case TypeCode.Byte: return (uint)(byte)input; |
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341 | case TypeCode.Int16: return (uint)(short)input; |
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342 | case TypeCode.UInt16: return (uint)(ushort)input; |
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343 | case TypeCode.Int32: return (uint)(int)input; |
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344 | case TypeCode.Int64: return (uint)(long)input; |
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345 | case TypeCode.UInt64: return (uint)(ulong)input; |
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346 | case TypeCode.Single: return (uint)(float)input; |
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347 | case TypeCode.Double: return (uint)(double)input; |
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348 | case TypeCode.Decimal: return (uint)(decimal)input; |
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349 | } |
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350 | break; |
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351 | case TypeCode.Int64: |
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352 | switch (sourceType) { |
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353 | case TypeCode.Char: return (long)(char)input; |
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354 | case TypeCode.SByte: return (long)(sbyte)input; |
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355 | case TypeCode.Byte: return (long)(byte)input; |
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356 | case TypeCode.Int16: return (long)(short)input; |
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357 | case TypeCode.UInt16: return (long)(ushort)input; |
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358 | case TypeCode.Int32: return (long)(int)input; |
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359 | case TypeCode.UInt32: return (long)(uint)input; |
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360 | case TypeCode.UInt64: return (long)(ulong)input; |
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361 | case TypeCode.Single: return (long)(float)input; |
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362 | case TypeCode.Double: return (long)(double)input; |
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363 | case TypeCode.Decimal: return (long)(decimal)input; |
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364 | } |
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365 | break; |
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366 | case TypeCode.UInt64: |
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367 | switch (sourceType) { |
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368 | case TypeCode.Char: return (ulong)(char)input; |
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369 | case TypeCode.SByte: return (ulong)(sbyte)input; |
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370 | case TypeCode.Byte: return (ulong)(byte)input; |
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371 | case TypeCode.Int16: return (ulong)(short)input; |
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372 | case TypeCode.UInt16: return (ulong)(ushort)input; |
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373 | case TypeCode.Int32: return (ulong)(int)input; |
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374 | case TypeCode.UInt32: return (ulong)(uint)input; |
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375 | case TypeCode.Int64: return (ulong)(long)input; |
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376 | case TypeCode.Single: return (ulong)(float)input; |
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377 | case TypeCode.Double: return (ulong)(double)input; |
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378 | case TypeCode.Decimal: return (ulong)(decimal)input; |
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379 | } |
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380 | break; |
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381 | case TypeCode.Single: |
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382 | switch (sourceType) { |
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383 | case TypeCode.Char: return (float)(char)input; |
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384 | case TypeCode.SByte: return (float)(sbyte)input; |
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385 | case TypeCode.Byte: return (float)(byte)input; |
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386 | case TypeCode.Int16: return (float)(short)input; |
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387 | case TypeCode.UInt16: return (float)(ushort)input; |
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388 | case TypeCode.Int32: return (float)(int)input; |
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389 | case TypeCode.UInt32: return (float)(uint)input; |
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390 | case TypeCode.Int64: return (float)(long)input; |
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391 | case TypeCode.UInt64: return (float)(ulong)input; |
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392 | case TypeCode.Double: return (float)(double)input; |
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393 | case TypeCode.Decimal: return (float)(decimal)input; |
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394 | } |
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395 | break; |
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396 | case TypeCode.Double: |
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397 | switch (sourceType) { |
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398 | case TypeCode.Char: return (double)(char)input; |
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399 | case TypeCode.SByte: return (double)(sbyte)input; |
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400 | case TypeCode.Byte: return (double)(byte)input; |
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401 | case TypeCode.Int16: return (double)(short)input; |
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402 | case TypeCode.UInt16: return (double)(ushort)input; |
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403 | case TypeCode.Int32: return (double)(int)input; |
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404 | case TypeCode.UInt32: return (double)(uint)input; |
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405 | case TypeCode.Int64: return (double)(long)input; |
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406 | case TypeCode.UInt64: return (double)(ulong)input; |
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407 | case TypeCode.Single: return (double)(float)input; |
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408 | case TypeCode.Decimal: return (double)(decimal)input; |
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409 | } |
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410 | break; |
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411 | case TypeCode.Decimal: |
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412 | switch (sourceType) { |
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413 | case TypeCode.Char: return (decimal)(char)input; |
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414 | case TypeCode.SByte: return (decimal)(sbyte)input; |
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415 | case TypeCode.Byte: return (decimal)(byte)input; |
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416 | case TypeCode.Int16: return (decimal)(short)input; |
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417 | case TypeCode.UInt16: return (decimal)(ushort)input; |
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418 | case TypeCode.Int32: return (decimal)(int)input; |
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419 | case TypeCode.UInt32: return (decimal)(uint)input; |
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420 | case TypeCode.Int64: return (decimal)(long)input; |
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421 | case TypeCode.UInt64: return (decimal)(ulong)input; |
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422 | case TypeCode.Single: return (decimal)(float)input; |
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423 | case TypeCode.Double: return (decimal)(double)input; |
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424 | } |
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425 | break; |
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426 | } |
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427 | throw new InvalidCastException("Cast from " + sourceType + " to " + targetType + " not supported."); |
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428 | } |
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429 | } |
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430 | } |
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431 | } |
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