mcs/class/Microsoft.Build.Tasks/Microsoft.Build.Tasks/WriteCodeFragment.cs

   1 //
   2 // WriteCodeFragment.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2014 Xamarin Inc (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29
  30 using System;
  31 using System.IO;
  32 using System.Collections;
  33 using System.Collections.Generic;
  34 using System.CodeDom;
  35 using System.CodeDom.Compiler;
  36 using System.Globalization;
  37 using Microsoft.Build.Framework;
  38 using Microsoft.Build.Utilities;
  39
  40 namespace Microsoft.Build.Tasks
  41 {
  42         public class WriteCodeFragment : TaskExtension
  43         {
  44                 public ITaskItem[] AssemblyAttributes { get; set; }
  45
  46                 [Required]
  47                 public string Language { get; set; }
  48
  49                 public ITaskItem OutputDirectory { get; set; }
  50
  51                 [Output]
  52                 public ITaskItem OutputFile { get; set; }
  53
  54                 public override bool Execute ()
  55                 {
  56                     if (OutputFile == null) {
  57                         if (OutputDirectory == null)
  58                                         return false;
  59
  60                                 throw new NotImplementedException ("Temporary file in custom directory");
  61                         } else {
  62                                 if (OutputDirectory != null)
  63                                         OutputFile = new TaskItem (Path.Combine (OutputDirectory.ItemSpec, OutputFile.ItemSpec));
  64                         }
  65
  66                         if (AssemblyAttributes == null) {
  67                                 OutputFile = null;
  68                                 return true;
  69                         }
  70
  71                         var file = OutputFile.ItemSpec;
  72                         if (!GenerateFile (file))
  73                                 return false;
  74
  75                         Log.LogMessage ("Emitted specified code into \"{0}\".", file);
  76                         return true;
  77                 }
  78
  79                 bool GenerateFile (string file)
  80                 {
  81                         var cu = new CodeCompileUnit ();
  82                         var ns = new CodeNamespace ();
  83                         cu.Namespaces.Add (ns);
  84
  85                         ns.Imports.Add (new CodeNamespaceImport ("System"));
  86                         ns.Imports.Add (new CodeNamespaceImport ("System.Reflection"));
  87                         ns.Comments.Add (new CodeCommentStatement ("Generated by the WriteCodeFragment task on " + DateTime.Now));
  88
  89                         foreach (var attr in AssemblyAttributes) {
  90                                 // There is no better way to get ordered parameter data
  91                                 // that this horrible api
  92                                 var metadata = attr.CloneCustomMetadata ();
  93                                 List<Tuple<int, CodeAttributeArgument>> args = null;
  94                                 foreach (DictionaryEntry entry in metadata) {
  95                                         var key = (string) entry.Key;
  96                                         if (!key.StartsWith ("_Parameter", StringComparison.Ordinal))
  97                                                 continue;
  98
  99                                         int key_value;
 100                                         if (!int.TryParse (key.Substring (10), NumberStyles.None, CultureInfo.InvariantCulture, out key_value))
 101                                                 continue;
 102
 103                                         if (args == null)
 104                                                 args = new List<Tuple<int, CodeAttributeArgument>> ();
 105
 106                                         args.Add (Tuple.Create (key_value, new CodeAttributeArgument (new CodePrimitiveExpression ((string) entry.Value))));
 107                                 }
 108
 109                                 var cad = new CodeAttributeDeclaration (attr.ItemSpec);
 110                                 if (args != null) {
 111                                         args.Sort ((a, b) => a.Item1.CompareTo (b.Item1));
 112                                         foreach (var arg in args)
 113                                                 cad.Arguments.Add (arg.Item2);
 114                                 }
 115
 116                                 cu.AssemblyCustomAttributes.Add (cad);
 117                         }
 118
 119                         var provider = CodeDomProvider.CreateProvider (Language);
 120                         using (var sw = new StreamWriter (file, false)) {
 121                                 provider.GenerateCodeFromCompileUnit (cu, sw, new CodeGeneratorOptions ());
 122                         }
 123
 124                         return true;
 125                 }
 126         }
 127 }
 128