public void ConditionalArrayIndex_Compile_Ref()
{
var px = Expression.Parameter(typeof(string[]));
var ax = new[] { Expression.Constant(0) };
var mx = CSharpExpression.ConditionalArrayIndex(px, ax);
var fx = Expression.Lambda <Func <string[], string> >(mx, px);
var dx = fx.Compile();
Assert.AreEqual("bar", dx(new[] { "bar" }));
Assert.IsNull(dx(null));
}
public void ConditionalArrayIndex_Compile_Val()
{
var px = Expression.Parameter(typeof(int[]));
var ax = new[] { Expression.Constant(0) };
var mx = CSharpExpression.ConditionalArrayIndex(px, ax);
var fx = Expression.Lambda <Func <int[], int?> >(mx, px);
var dx = fx.Compile();
Assert.AreEqual(42, dx(new[] { 42 }));
Assert.IsNull(dx(null));
}
public void ConditionalArrayIndex_Properties()
{
var array = Expression.Default(typeof(string[]));
var indexes = new[] { Expression.Constant(0) };
foreach (var e in new[]
{
CSharpExpression.ConditionalArrayIndex(array, indexes),
CSharpExpression.ConditionalArrayIndex(array, indexes.AsEnumerable()),
})
{
Assert.AreEqual(CSharpExpressionType.ConditionalAccess, e.CSharpNodeType);
Assert.AreSame(array, e.Array);
Assert.AreEqual(typeof(string), e.Type);
Assert.IsTrue(e.Indexes.SequenceEqual(indexes));
}
}
public void ConditionalArrayIndex_Update()
{
var array = Expression.Default(typeof(string[]));
var indexes = new[] { Expression.Constant(0) };
var res = CSharpExpression.ConditionalArrayIndex(array, indexes);
Assert.AreSame(res, res.Update(res.Array, res.Indexes));
var obj1 = Expression.Default(typeof(string[]));
var upd1 = res.Update(obj1, res.Indexes);
Assert.AreNotSame(upd1, res);
Assert.AreSame(res.Indexes, upd1.Indexes);
Assert.AreSame(obj1, upd1.Array);
var upd2 = res.Update(array, new[] { indexes[0] });
Assert.AreNotSame(upd2, res);
Assert.AreSame(res.Array, upd2.Array);
Assert.IsTrue(upd2.Indexes.SequenceEqual(new[] { indexes[0] }));
}
public void ConditionalArrayIndex_Factory_ArgumentChecking()
{
var array = Expression.Default(typeof(string[]));
var indexes = new[] { Expression.Constant(1) };
// null
AssertEx.Throws <ArgumentNullException>(() => CSharpExpression.ConditionalArrayIndex(default(Expression), indexes));
AssertEx.Throws <ArgumentNullException>(() => CSharpExpression.ConditionalArrayIndex(array, default(Expression[])));
AssertEx.Throws <ArgumentNullException>(() => CSharpExpression.ConditionalArrayIndex(array, default(IEnumerable <Expression>)));
// not an array
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalArrayIndex(Expression.Default(typeof(long))));
// wrong amount of indexes
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalArrayIndex(Expression.Default(typeof(string[]))));
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalArrayIndex(Expression.Default(typeof(string[])), Expression.Constant(1), Expression.Constant(2)));
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalArrayIndex(Expression.Default(typeof(string[, ]))));
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalArrayIndex(Expression.Default(typeof(string[, ])), Expression.Constant(1)));
// indexes not of type int
AssertEx.Throws <ArgumentException>(() => CSharpExpression.ConditionalArrayIndex(Expression.Default(typeof(string[, ])), Expression.Constant(1), Expression.Constant("bar")));
}