public void ConditionalCall_Compile_Extension()
{
var reverse = MethodInfoOf(() => Ext.Reverse(default(string)));
var reverseSubstring = MethodInfoOf(() => Ext.ReverseSubstring(default(string), default(int), default(int)));
var p = Expression.Parameter(typeof(string));
var q = "foobar";
var m1 = CSharpExpression.ConditionalCall(p, reverse);
var f1 = Expression.Lambda <Func <string, string> >(m1, p);
var d1 = f1.Compile();
Assert.AreEqual("raboof", d1(q));
Assert.IsNull(d1(null));
var m2 = CSharpExpression.ConditionalCall(p, reverseSubstring, new[] { Expression.Constant(2), Expression.Constant(3) });
var f2 = Expression.Lambda <Func <string, string> >(m2, p);
var d2 = f2.Compile();
Assert.AreEqual("abo", d2(q));
Assert.IsNull(d2(null));
var ps = reverseSubstring.GetParameters();
var m3 = CSharpExpression.ConditionalCall(p, reverseSubstring, CSharpExpression.Bind(ps[2], Expression.Constant(3)), CSharpExpression.Bind(ps[1], Expression.Constant(2)));
var f3 = Expression.Lambda <Func <string, string> >(m3, p);
var d3 = f3.Compile();
Assert.AreEqual("abo", d3(q));
Assert.IsNull(d3(null));
}
public void ConditionalCall_Compile_Val()
{
var p = Expression.Parameter(typeof(Quz?));
var q = new Quz();
var m1 = CSharpExpression.ConditionalCall(p, typeof(Quz).GetMethod("X"));
var f1 = Expression.Lambda <Func <Quz?, int?> >(m1, p);
var d1 = f1.Compile();
Assert.AreEqual(42, d1(q));
Assert.IsNull(d1(null));
var m2 = CSharpExpression.ConditionalCall(p, typeof(Quz).GetMethod("N"));
var f2 = Expression.Lambda <Func <Quz?, int?> >(m2, p);
var d2 = f2.Compile();
Assert.AreEqual(42, d2(q));
Assert.IsNull(d2(null));
var m3 = CSharpExpression.ConditionalCall(p, typeof(Quz).GetMethod("S"));
var f3 = Expression.Lambda <Func <Quz?, string> >(m3, p);
var d3 = f3.Compile();
Assert.AreEqual("bar", d3(q));
Assert.IsNull(d3(null));
}
public void ConditionalCall_Compile_Ref()
{
var p = Expression.Parameter(typeof(Qux));
var q = new Qux();
var m1 = CSharpExpression.ConditionalCall(p, typeof(Qux).GetMethod("X"));
var f1 = Expression.Lambda <Func <Qux, int?> >(m1, p);
var d1 = f1.Compile();
Assert.AreEqual(42, d1(q));
Assert.IsNull(d1(null));
var m2 = CSharpExpression.ConditionalCall(p, typeof(Qux).GetMethod("N"));
var f2 = Expression.Lambda <Func <Qux, int?> >(m2, p);
var d2 = f2.Compile();
Assert.AreEqual(42, d2(q));
Assert.IsNull(d2(null));
var m3 = CSharpExpression.ConditionalCall(p, typeof(Qux).GetMethod("S"));
var f3 = Expression.Lambda <Func <Qux, string> >(m3, p);
var d3 = f3.Compile();
Assert.AreEqual("bar", d3(q));
Assert.IsNull(d3(null));
var m4 = CSharpExpression.ConditionalCall(p, typeof(Qux).GetMethod("V"));
var f4 = Expression.Lambda <Action <Qux> >(m4, p);
var d4 = f4.Compile();
d4(q); // does not throw
}
public void ConditionalCall_Update()
{
var baz = MethodInfoOf((Bar b) => b.Baz(default(int)));
var parameter = baz.GetParameters()[0];
var obj = Expression.Default(typeof(Bar));
var value = Expression.Constant(0);
var arg = CSharpExpression.Bind(parameter, value);
var res = CSharpExpression.ConditionalCall(obj, baz, arg);
Assert.AreSame(res, res.Update(res.Object, res.Arguments));
var obj1 = Expression.Default(typeof(Bar));
var upd1 = res.Update(obj1, res.Arguments);
Assert.AreNotSame(upd1, res);
Assert.AreSame(res.Arguments, upd1.Arguments);
Assert.AreSame(obj1, upd1.Object);
var upd2 = res.Update(obj, new[] { arg });
Assert.AreNotSame(upd2, res);
Assert.AreSame(res.Object, upd2.Object);
Assert.IsTrue(upd2.Arguments.SequenceEqual(new[] { arg }));
}
public void ConditionalAccess_ManOrBoy1()
{
var p = Expression.Parameter(typeof(C));
var x = Expression.Constant(0);
var F = p.Type.GetField("F");
var P = p.Type.GetProperty("P");
var I = p.Type.GetProperty("Item");
var M = p.Type.GetMethod("M");
var cF = (Func <Expression, Expression>)(e => CSharpExpression.ConditionalField(e, F));
var cP = (Func <Expression, Expression>)(e => CSharpExpression.ConditionalProperty(e, P));
var cI = (Func <Expression, Expression>)(e => CSharpExpression.ConditionalIndex(e, I, new[] { x }));
var cM = (Func <Expression, Expression>)(e => CSharpExpression.ConditionalCall(e, M, new[] { x }));
var cases = new Func <Expression, Expression>[][]
{
new[] { cF },
new[] { cF, cP },
new[] { cF, cP, cI },
new[] { cF, cP, cI, cM },
new[] { cM },
new[] { cM, cF },
new[] { cM, cF, cP },
new[] { cM, cF, cP, cI },
new[] { cI },
new[] { cI, cM },
new[] { cI, cM, cF },
new[] { cI, cM, cF, cP },
new[] { cP },
new[] { cP, cI },
new[] { cP, cI, cM },
new[] { cP, cI, cM, cF },
};
foreach (var cs in cases)
{
var e = cs.Aggregate((Expression)p, (a, b) => b(a));
var f = Expression.Lambda <Func <C, C> >(e, p).Compile();
Assert.IsNull(f(null));
for (var i = 0; i < cs.Length; i++)
{
Assert.IsNull(f(new C(i)));
}
Assert.IsNotNull(f(new C(cs.Length)));
}
}
public void ConditionalCall_Factory_Expression()
{
var method = MethodInfoOf((C c) => c.F(default(int), default(int), default(int)));
var obj = Expression.Constant(new C());
var args = new[] { Expression.Constant(1), Expression.Constant(2) };
foreach (var e in new[]
{
CSharpExpression.ConditionalCall(obj, method, args),
CSharpExpression.ConditionalCall(obj, method, args.AsEnumerable()),
})
{
Assert.AreSame(obj, e.Object);
Assert.AreEqual(method, e.Method);
Assert.AreEqual(2, e.Arguments.Count);
Assert.AreEqual(method.GetParameters()[0], e.Arguments[0].Parameter);
Assert.AreEqual(method.GetParameters()[1], e.Arguments[1].Parameter);
Assert.AreSame(args[0], e.Arguments[0].Expression);
Assert.AreSame(args[1], e.Arguments[1].Expression);
}
var tooLittle = args.Take(1);
foreach (var f in new Func <ConditionalMethodCallCSharpExpression>[]
{
() => CSharpExpression.ConditionalCall(obj, method, tooLittle),
() => CSharpExpression.ConditionalCall(obj, method, tooLittle.AsEnumerable()),
})
{
AssertEx.Throws <ArgumentException>(() => f());
}
var tooMany = args.Concat(args).ToArray();
foreach (var f in new Func <ConditionalMethodCallCSharpExpression>[]
{
() => CSharpExpression.ConditionalCall(obj, method, tooMany),
() => CSharpExpression.ConditionalCall(obj, method, tooMany.AsEnumerable()),
})
{
AssertEx.Throws <ArgumentException>(() => f());
}
}
public void ConditionalCall_Factory_ArgumentChecking()
{
var expr = Expression.Default(typeof(Bar));
var other = Expression.Default(typeof(string));
var methodName = "Foo";
var methodInfo = typeof(Bar).GetMethod(methodName);
// null
AssertEx.Throws <ArgumentNullException>(() => CSharpExpression.ConditionalCall(default(Expression), methodInfo));
AssertEx.Throws <ArgumentNullException>(() => CSharpExpression.ConditionalCall(expr, default(MethodInfo)));
// static
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(expr, expr.Type.GetMethod("Qux")));
// wrong declaring type
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(other, methodInfo));
}
public void ConditionalCall_Factory_Extension()
{
var s = Expression.Constant("bar");
var x = Expression.Constant(42);
var reverse = MethodInfoOf(() => Ext.Reverse(default(string)));
// needs instance
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(null, reverse, new Expression[0]));
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(null, reverse, new[] { s }));
// duplicate binding
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(s, reverse, new[] { s }));
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(s, reverse, CSharpExpression.Bind(reverse.GetParameters()[0], s)));
// wrong type
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalCall(x, reverse));
}
public void ConditionalCall_Properties()
{
var baz = MethodInfoOf((Bar b) => b.Baz(default(int)));
var parameter = baz.GetParameters()[0];
var obj = Expression.Default(typeof(Bar));
var value = Expression.Constant(0);
var arg = CSharpExpression.Bind(parameter, value);
foreach (var e in new[]
{
CSharpExpression.ConditionalCall(obj, baz, arg),
CSharpExpression.ConditionalCall(obj, baz, new[] { arg }.AsEnumerable()),
})
{
Assert.AreEqual(CSharpExpressionType.ConditionalAccess, e.CSharpNodeType);
Assert.AreSame(obj, e.Object);
Assert.AreEqual(baz, e.Method);
Assert.AreEqual(typeof(int?), e.Type);
Assert.IsTrue(e.Arguments.SequenceEqual(new[] { arg }));
}
}
public void ConditionalAccess_ManOrBoy3()
{
var p1 = new Person {
Name = "Bart"
};
var p2 = new Person {
Name = "Bart", DOB = new DateTime(1983, 2, 11)
};
var p = Expression.Parameter(typeof(Person));
var name = PropertyInfoOf((Person x) => x.Name);
var dob = PropertyInfoOf((Person x) => x.DOB);
var length = PropertyInfoOf((string s) => s.Length);
var year = PropertyInfoOf((DateTime x) => x.Year);
var toUpper = MethodInfoOf((string s) => s.ToUpper());
var e1 = CSharpExpression.ConditionalProperty(CSharpExpression.ConditionalProperty(p, name), length);
var f1 = Expression.Lambda <Func <Person, int?> >(e1, p).Compile();
Assert.IsNull(f1(null));
Assert.AreEqual(4, f1(p1).Value);
var e2 = CSharpExpression.ConditionalCall(CSharpExpression.ConditionalProperty(p, name), toUpper);
var f2 = Expression.Lambda <Func <Person, string> >(e2, p).Compile();
Assert.IsNull(f2(null));
Assert.AreEqual("BART", f2(p1));
var e3 = CSharpExpression.ConditionalProperty(CSharpExpression.ConditionalProperty(p, dob), year);
var f3 = Expression.Lambda <Func <Person, int?> >(e3, p).Compile();
Assert.IsNull(f3(null));
Assert.IsNull(f3(p1));
Assert.AreEqual(1983, f3(p2));
}