1 | // Copyright (c) 2010-2014 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.TypeSystem |
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22 | { |
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23 | /// <summary> |
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24 | /// Helper class for dealing with System.Threading.Tasks.Task. |
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25 | /// </summary> |
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26 | public static class TaskType |
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27 | { |
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28 | /// <summary> |
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29 | /// Gets the T in Task<T>. |
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30 | /// Returns void for non-generic Task. |
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31 | /// Any other type is returned unmodified. |
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32 | /// </summary> |
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33 | public static IType UnpackTask(ICompilation compilation, IType type) |
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34 | { |
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35 | if (!IsTask(type)) |
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36 | return type; |
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37 | if (type.TypeParameterCount == 0) |
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38 | return compilation.FindType(KnownTypeCode.Void); |
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39 | else |
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40 | return type.TypeArguments[0]; |
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41 | } |
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42 | |
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43 | /// <summary> |
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44 | /// Gets whether the specified type is Task or Task<T>. |
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45 | /// </summary> |
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46 | public static bool IsTask(IType type) |
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47 | { |
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48 | ITypeDefinition def = type.GetDefinition(); |
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49 | if (def != null) { |
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50 | if (def.KnownTypeCode == KnownTypeCode.Task) |
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51 | return true; |
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52 | if (def.KnownTypeCode == KnownTypeCode.TaskOfT) |
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53 | return type is ParameterizedType; |
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54 | } |
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55 | return false; |
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56 | } |
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57 | |
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58 | /// <summary> |
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59 | /// Creates a task type. |
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60 | /// </summary> |
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61 | public static IType Create(ICompilation compilation, IType elementType) |
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62 | { |
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63 | if (compilation == null) |
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64 | throw new ArgumentNullException("compilation"); |
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65 | if (elementType == null) |
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66 | throw new ArgumentNullException("elementType"); |
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67 | |
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68 | if (elementType.Kind == TypeKind.Void) |
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69 | return compilation.FindType(KnownTypeCode.Task); |
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70 | IType taskType = compilation.FindType(KnownTypeCode.TaskOfT); |
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71 | ITypeDefinition taskTypeDef = taskType.GetDefinition(); |
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72 | if (taskTypeDef != null) |
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73 | return new ParameterizedType(taskTypeDef, new [] { elementType }); |
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74 | else |
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75 | return taskType; |
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76 | } |
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77 | } |
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78 | } |
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