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ObjectInitializerTests.cs
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using Cecilifier.Core.Tests.Tests.Unit.Framework;
using NUnit.Framework;
namespace Cecilifier.Core.Tests.Tests.Unit;
[TestFixture]
public class ObjectInitializerTests : CecilifierUnitTestBase
{
// https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/object-and-collection-initializers
[Test]
public void ObjectInitializer()
{
var code = @"class Foo { public int Value; public bool B; } class Bar { public void M() { var x = new Foo { Value = 42, B = true }; } }";
var result = RunCecilifier(code);
var expected = """
(il_M_\d+\.Emit\(OpCodes\.)Newobj, ctor_foo_3\);
(\s+\1)Dup\);
\2Ldc_I4, 42\);
\2Stfld, fld_value_\d+\);
\2Dup\);
\2Ldc_I4, 1\);
\2Stfld, fld_B_\d+\);
\2Stloc, l_x_\d+\);
""";
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match(expected));
}
[Test]
public void DictionaryInitializer()
{
var code = @"var x = new System.Collections.Generic.Dictionary<int, int>()
{
[1] = 11, [2] = 22
};";
var result = RunCecilifier(code);
var expected = @"m_topLevelStatements_1.Body.Variables.Add\((l_x_\d+)\);\s+" +
@"(il_topLevelMain_\d+\.Emit\(OpCodes\.)Newobj,.+typeof\(System\.Collections\.Generic\.Dictionary<System.Int32, System.Int32>\).+\)\);\s+" +
@"\2Dup\);\s+" +
@"\2Ldc_I4, 1\);\s+" +
@"\2Ldc_I4, 11\);\s+" +
@"\2Callvirt,.+set_Item.+\)\);\s+" +
@"\2Dup\);\s+" +
@"\2Ldc_I4, 2\);\s+" +
@"\2Ldc_I4, 22\);\s+" +
@"\2Callvirt,.+set_Item.+\)\);\s+" +
@"\2Stloc, \1\);\s+";
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match(expected));
}
[Test]
public void CustomCollectionAndComplexObjectInitializer()
{
var code = @"using System.Collections;
class CollectionFoo : IEnumerable
{
public IEnumerator GetEnumerator() { return null;}
public void Add(bool b, int i) {}
public void Add(char ch) {}
}
class Driver
{
void M()
{
var x = new CollectionFoo()
{
{true, 1},
{'A'}
};
}
}";
var result = RunCecilifier(code);
var expected = @"(il_M_\d+.Emit\(OpCodes\.)Newobj, ctor_collectionFoo_\d+\);\s+" +
@"\1Dup\);\s+" +
@"\1Ldc_I4, 1\);\s+" +
@"\1Ldc_I4, 1\);\s+" +
@"\1Callvirt,.+m_add_\d+\);\s+" +
@"\1Dup\);\s+" +
@"\1Ldc_I4, 65\);\s+" +
@"\1Callvirt,.+m_add_\d+\);\s+";
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match(expected));
}
[Test]
public void CustomCollectionInitializer()
{
var code = """
using System.Collections;
class CollectionFoo : IEnumerable
{
public IEnumerator GetEnumerator() => null;
public void Add(char ch) {}
}
class Driver { CollectionFoo M() => new CollectionFoo() { 'A', 'B', 'C' }; }
""";
var result = RunCecilifier(code);
var expected = @"(il_M_\d+.Emit\(OpCodes\.)Newobj, ctor_collectionFoo_\d+\);\s+" +
@"\1Dup\);\s+" +
@"\1Ldc_I4, 65\);\s+" +
@"\1Callvirt,.+m_add_\d+\);\s+" +
@"\1Dup\);\s+" +
@"\1Ldc_I4, 66\);\s+" +
@"\1Callvirt,.+m_add_\d+\);\s+"+
@"\1Dup\);\s+" +
@"\1Ldc_I4, 67\);\s+" +
@"\1Callvirt,.+m_add_\d+\);";
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match(expected));
}
[Test]
public void CustomCollectionInitializerAddMethodBoundToExtensionMethod()
{
var code = """
static class Ext { public static void Add(this Foo self, string s) {} }
class Foo : System.Collections.IEnumerable
{
public System.Collections.IEnumerator GetEnumerator() => null;
static void Main()
{
var f = new Foo() { "W1", "W2" };
}
}
""";
var result = RunCecilifier(code);
var expected = @"(il_main_\d+\.Emit\(OpCodes\.)Dup\);\s+" +
@"\1Ldstr, ""W1""\);\s+" +
@"\1Call,.+m_add_\d+\);\s+"+
@"\1Dup\);\s+" +
@"\1Ldstr, ""W2""\);\s+" +
@"\1Call,.+m_add_\d+\);";
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match(expected));
}
[TestCase(
"M(new Bar() { Value = 1 } , new Bar() { Value = 2 } );",
"""
m_topLevelStatements_\d+.Body.Variables.Add\(l_vt_\d+\);
(\s+il_topLevelMain_\d+\.Emit\(OpCodes\.)Ldloca_S, (l_vt_\d+)\);
\1Initobj, st_bar_0\);
\1Ldloca_S, \2\);
\1Dup\);
\1Ldc_I4, 1\);
\1Call, l_set_\d+\);
\1Pop\);
\1Ldloc, \2\);
\s+var (l_vt_\d+) = new VariableDefinition\(st_bar_0\);
\s+m_topLevelStatements_\d+.Body.Variables.Add\(\3\);
\1Ldloca_S, \3\);
\1Initobj, st_bar_0\);
\1Ldloca_S, \3\);
\1Dup\);
\1Ldc_I4, 2\);
\1Call, l_set_\d+\);
\1Pop\);
\1Ldloca, \3\);
\1Call, m_M_\d+\);
""",
TestName = "As method argument")]
[TestCase("""var x = new Bar { Name = "A", Value = 3 };""",
"""
var (l_x_\d+) = new VariableDefinition\(st_bar_0\);
\s+m_topLevelStatements_\d+.Body.Variables.Add\(\1\);
(\s+il_topLevelMain_\d+\.Emit\(OpCodes\.)Ldloca_S, \1\);
\2Initobj, st_bar_0\);
\2Ldloca_S, \1\);
\2Dup\);
\2Ldstr, "A"\);
\2Call, l_set_\d+\);
\2Dup\);
\2Ldc_I4, 3\);
\2Call, l_set_\d+\);
\2Pop\);
""",
TestName = "in variable initializer")]
[TestCase("Bar b; b = new Bar { Value = 3 };",
"""
(\s+il_topLevelMain_\d+\.Emit\(OpCodes\.)Ldloca_S, (l_b_\d+)\);
\1Dup\);
\1Initobj, st_bar_0\);
\1Dup\);
\1Ldc_I4, 3\);
\1Call, l_set_\d+\);
\1Pop\);
""",
TestName = "in assignment")]
[TestCase("""var z = new Bar() { Name = "123", Value = 6 }.Value;""",
"""
var (l_vt_\d+) = new VariableDefinition\((st_bar_\d+)\);
\s+(m_topLevelStatements_\d+).Body.Variables.Add\(\1\);
(\s+il_topLevelMain_\d+.Emit\(OpCodes\.)Ldloca_S, \1\);
\4Initobj, \2\);
\4Ldloca_S, \1\);
\4Dup\);
\4Ldstr, "123"\);
\4Call, l_set_\d+\);
\4Dup\);
\4Ldc_I4, 6\);
\4Call, l_set_1\d+\);
\4Pop\);
\4Ldloca, \1\);
\4Call, m_get_\d+\);
""",
TestName = "in member access expression")]
[TestCase("Bar []ba = new Bar[1]; ba[0] = new Bar { Value = 3 };",
"""
\s+//Bar \[\]ba = new Bar\[1\];
\s+var (?<array_var>l_ba_\d+) = new VariableDefinition\(st_bar_0.MakeArrayType\(\)\);
\s+m_topLevelStatements_\d+.Body.Variables.Add\(\k<array_var>\);
(\s+il_topLevelMain_\d+\.Emit\(OpCodes\.)Ldc_I4, 1\);
\1Newarr, st_bar_0\);
\1Stloc, \k<array_var>\);
\s+//ba\[0\] = new Bar { Value = 3 };
\1Ldloc, \k<array_var>\);
\1Ldc_I4, 0\);
\1Ldelema, st_bar_0\);
\1Dup\);
\1Initobj, st_bar_0\);
\1Dup\);
\1Ldc_I4, 3\);
\1Call, l_set_\d+\);
\1Pop\);
""",
TestName = "in assignment to array element")]
public void ObjectInitializers_AreHandled_InValueTypes(string statementToTest, string expectedRegex)
{
var result = RunCecilifier($$"""
{{statementToTest}}
void M(Bar bar, in Bar ib) { }
struct Bar
{
public string Name {get; set; }
public int Value { get; set; }
}
""");
Assert.That(result.GeneratedCode.ReadToEnd(), Does.Match(expectedRegex));
}
}