class/System.Core/Test/System.Linq.Expressions/ExpressionTest.cs

   1 //
   2 // ExpressionTest.cs
   3 //
   4 // Author:
   5 //   Jb Evain (jbevain@novell.com)
   6 //
   7 // (C) 2008 Novell, Inc. (http://www.novell.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 using System;
  30 using System.Collections.Generic;
  31 using System.Reflection;
  32 using System.Runtime.CompilerServices;
  33 using System.Linq;
  34 using System.Linq.Expressions;
  35
  36 using NUnit.Framework;
  37
  38 namespace MonoTests.System.Linq.Expressions {
  39
  40         [TestFixture]
  41         public class ExpressionTest {
  42
  43                 [Test]
  44                 [ExpectedException (typeof (ArgumentNullException))]
  45                 public void GetFuncTypeArgNull ()
  46                 {
  47                         Expression.GetFuncType (null);
  48                 }
  49
  50                 static Type [] GetTestTypeArray (int length)
  51                 {
  52                         return Enumerable.Range (0, length - 1)
  53                                 .Select (i => typeof (int))
  54                                 .ToArray ();
  55                 }
  56
  57                 [Test]
  58                 [ExpectedException (typeof (ArgumentException))]
  59                 public void GetFuncTypeArgEmpty ()
  60                 {
  61                         Expression.GetFuncType (Type.EmptyTypes);
  62                 }
  63
  64                 [Test]
  65                 [ExpectedException (typeof (ArgumentException))]
  66                 public void GetFuncTypeArgTooBig ()
  67                 {
  68                         Expression.GetFuncType (GetTestTypeArray (64));
  69                 }
  70
  71                 [Test]
  72                 public void GetFuncTypeTest ()
  73                 {
  74                         var func = Expression.GetFuncType (new [] {typeof (int)});
  75                         Assert.AreEqual (typeof (Func<int>), func);
  76
  77                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int)});
  78                         Assert.AreEqual (typeof (Func<int, int>), func);
  79
  80                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int)});
  81                         Assert.AreEqual (typeof (Func<int, int, int>), func);
  82
  83                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int), typeof (int)});
  84                         Assert.AreEqual (typeof (Func<int, int, int, int>), func);
  85
  86                         func = Expression.GetFuncType (new [] {typeof (int), typeof (int), typeof (int), typeof (int), typeof (int)});
  87                         Assert.AreEqual (typeof (Func<int, int, int, int, int>), func);
  88                 }
  89
  90                 [Test]
  91                 [ExpectedException (typeof (ArgumentNullException))]
  92                 public void GetActionTypeArgNull ()
  93                 {
  94                         Expression.GetActionType (null);
  95                 }
  96
  97                 [Test]
  98                 [ExpectedException (typeof (ArgumentException))]
  99                 public void GetActionTypeArgTooBig ()
 100                 {
 101                         Expression.GetActionType (GetTestTypeArray (45));
 102                 }
 103
 104                 [Test]
 105                 public void GetActionTypeTest ()
 106                 {
 107                         var action = Expression.GetActionType (new Type [0]);
 108                         Assert.AreEqual (typeof (Action), action);
 109
 110                         action = Expression.GetActionType (new [] {typeof (int)});
 111                         Assert.AreEqual (typeof (Action<int>), action);
 112
 113                         action = Expression.GetActionType (new [] {typeof (int), typeof (int)});
 114                         Assert.AreEqual (typeof (Action<int, int>), action);
 115
 116                         action = Expression.GetActionType (new [] {typeof (int), typeof (int), typeof (int)});
 117                         Assert.AreEqual (typeof (Action<int, int, int>), action);
 118
 119                         action = Expression.GetActionType (new [] {typeof (int), typeof (int), typeof (int), typeof (int)});
 120                         Assert.AreEqual (typeof (Action<int, int, int, int>), action);
 121                 }
 122
 123                 [Test]
 124                 [ExpectedException (typeof (ArgumentNullException))]
 125                 public void ParameterNullType ()
 126                 {
 127                         Expression.Parameter (null, "foo");
 128                 }
 129
 130                 [Test]
 131                 public void ParameterNullName ()
 132                 {
 133                         var p = Expression.Parameter (typeof (string), null);
 134                         Assert.AreEqual (null, p.Name);
 135                         Assert.AreEqual (typeof (string), p.Type);
 136 #if !NET_4_0
 137                         Assert.AreEqual ("<param>", p.ToString ());
 138 #endif
 139                 }
 140
 141                 [Test]
 142                 public void ParameterEmptyName ()
 143                 {
 144                         var p = Expression.Parameter (typeof (string), "");
 145                         Assert.AreEqual ("", p.Name);
 146                         Assert.AreEqual (typeof (string), p.Type);
 147 #if !NET_4_0
 148                         Assert.AreEqual ("", p.ToString ());
 149 #endif
 150                 }
 151
 152                 [Test]
 153                 public void Parameter ()
 154                 {
 155                         var p = Expression.Parameter (typeof (string), "foo");
 156                         Assert.AreEqual ("foo", p.Name);
 157                         Assert.AreEqual (typeof (string), p.Type);
 158                         Assert.AreEqual ("foo", p.ToString ());
 159                 }
 160
 161                 [Test]
 162                 [Category ("NotDotNet")]
 163                 [ExpectedException (typeof (ArgumentException))]
 164                 public void VoidParameter ()
 165                 {
 166                         Expression.Parameter (typeof (void), "hello");
 167                 }
 168
 169                 static int buffer;
 170
 171                 public static int Identity (int i)
 172                 {
 173                         buffer = i;
 174                         return i;
 175                 }
 176
 177                 [Test]
 178                 public void CompileActionDiscardingRetValue ()
 179                 {
 180                         var p = Expression.Parameter (typeof (int), "i");
 181                         var identity = GetType ().GetMethod ("Identity", BindingFlags.Static | BindingFlags.Public );
 182                         Assert.IsNotNull (identity);
 183
 184                         var lambda = Expression.Lambda<Action<int>> (Expression.Call (identity, p), p);
 185
 186                         var method = lambda.Compile ();
 187
 188                         buffer = 0;
 189
 190                         method (42);
 191                         Assert.AreEqual (42, buffer);
 192                 }
 193
 194                 [Test]
 195                 [Category("TargetJvmNotSupported")]
 196                 public void ExpressionDelegateTarget ()
 197                 {
 198                         var p = Expression.Parameter (typeof (string), "str");
 199                         var identity = Expression.Lambda<Func<string, string>> (p, p).Compile ();
 200
 201                         Assert.AreEqual (typeof (Func<string, string>), identity.GetType ());
 202                         Assert.IsNotNull (identity.Target);
 203 #if !NET_4_0
 204                         Assert.AreEqual (typeof (ExecutionScope), identity.Target.GetType ());
 205 #endif
 206                 }
 207
 208                 class Foo {
 209                         public string gazonk;
 210                 }
 211
 212                 struct Bar {
 213                         public int baz;
 214
 215                         public override string ToString ()
 216                         {
 217                                 return baz.ToString ();
 218                         }
 219                 }
 220
 221 #if !NET_4_0
 222                 [Test]
 223                 [Category ("TargetJvmNotSupported")]
 224                 public void GlobalsInScope ()
 225                 {
 226                         var foo = new Foo { gazonk = "gazonk" };
 227                         var bar = new Bar { baz = 42 };
 228
 229                         var l = Expression.Lambda<Func<string>> (
 230                                 Expression.Call (
 231                                         typeof (string).GetMethod ("Concat", new [] { typeof (string), typeof (string) }),
 232                                         Expression.Field (Expression.Constant (foo), typeof (Foo).GetField ("gazonk")),
 233                                         Expression.Call (Expression.Constant (bar), typeof (Bar).GetMethod ("ToString"))));
 234
 235                         var del = l.Compile ();
 236
 237                         var scope = del.Target as ExecutionScope;
 238
 239                         Assert.IsNotNull (scope);
 240
 241                         var globals = scope.Globals;
 242
 243                         Assert.IsNotNull (globals);
 244
 245                         Assert.AreEqual (2, globals.Length);
 246                         Assert.AreEqual (typeof (StrongBox<Foo>), globals [0].GetType ());
 247                         Assert.AreEqual (typeof (StrongBox<Bar>), globals [1].GetType ());
 248
 249                         Assert.AreEqual (foo, ((StrongBox<Foo>) globals [0]).Value);
 250                         Assert.AreEqual (bar, ((StrongBox<Bar>) globals [1]).Value);
 251
 252                         Assert.AreEqual ("gazonk42", del ());
 253                 }
 254 #endif
 255
 256                 [Test]
 257                 public void SimpleHoistedParameter ()
 258                 {
 259                         var p = Expression.Parameter (typeof (string), "s");
 260
 261                         var f = Expression.Lambda<Func<string, Func<string>>> (
 262                                 Expression.Lambda<Func<string>> (
 263                                         p,
 264                                         new ParameterExpression [0]),
 265                                 p).Compile ();
 266
 267                         var f2 = f ("x");
 268
 269                         Assert.AreEqual ("x", f2 ());
 270                 }
 271
 272                 [Test]
 273                 public void TwoHoistingLevels ()
 274                 {
 275                         var p1 = Expression.Parameter (typeof (string), "x");
 276                         var p2 = Expression.Parameter (typeof (string), "y");
 277
 278                         Expression<Func<string, Func<string, Func<string>>>> e =
 279                                 Expression.Lambda<Func<string, Func<string, Func<string>>>> (
 280                                         Expression.Lambda<Func<string, Func<string>>> (
 281                                                 Expression.Lambda<Func<string>> (
 282                                                         Expression.Call (
 283                                                                 typeof (string).GetMethod ("Concat", new [] { typeof (string), typeof (string) }),
 284                                                                 new [] { p1, p2 }),
 285                                                         new ParameterExpression [0]),
 286                                                 new [] { p2 }),
 287                                         new [] { p1 });
 288
 289                         var f = e.Compile ();
 290                         var f2 = f ("Hello ");
 291                         var f3 = f2 ("World !");
 292
 293                         Assert.AreEqual ("Hello World !", f3 ());
 294                 }
 295
 296                 [Test]
 297                 public void HoistedParameter ()
 298                 {
 299                         var i = Expression.Parameter (typeof (int), "i");
 300
 301                         var l = Expression.Lambda<Func<int, string>> (
 302                                 Expression.Invoke (
 303                                         Expression.Lambda<Func<string>> (
 304                                                 Expression.Call (i, typeof (int).GetMethod ("ToString", Type.EmptyTypes)))), i).Compile ();
 305
 306                         Assert.AreEqual ("42", l (42));
 307                 }
 308         }
 309 }