private Expression CreateDeepCopyRectangulerArrayExpression(
Type type,
Type elementType,
Expression source,
Expression destination,
Expression cache)
{
int rank = type.GetArrayRank();
var indexes = Enumerable.Range(0, rank)
.Select(x => Expression.Parameter(typeof(int), $"i{x}"))
.ToArray();
var lengths = Enumerable.Range(0, rank)
.Select(x => ExpressionUtils.GetArrayLength(source, x))
.ToArray();
var arrayAssign = Expression.Assign(
destination,
Expression.NewArrayBounds(elementType, lengths));
var elementAssign = elementType.IsArray
? Build(
TypeUtils.IsValueType(elementType.GetElementType())
? CopyPolicy.ShallowCopy : CopyPolicy.DeepCopy,
elementType,
Expression.ArrayIndex(source, indexes),
Expression.ArrayAccess(destination, indexes),
cache)
: ClassCloner.Instance.Build(
elementType,
Expression.ArrayIndex(source, indexes),
Expression.ArrayAccess(destination, indexes),
cache);
Expression Loop(int rankIndex)
{
var endLoop = Expression.Label($"EndLoop{rankIndex}");
return(Expression.Block(
Expression.Assign(indexes[rankIndex], ExpressionUtils.Zero),
Expression.Loop(
Expression.Block(
Expression.IfThen(
Expression.GreaterThanOrEqual(indexes[rankIndex], lengths[rankIndex]),
Expression.Break(endLoop)),
rankIndex < rank - 1 ? Loop(rankIndex + 1) : elementAssign,
Expression.PreIncrementAssign(indexes[rankIndex])),
endLoop)));
}
return(Expression.Block(
indexes,
indexes.Select(i => Expression.Assign(i, ExpressionUtils.Zero))
.Concat(new[] { arrayAssign, Loop(0) })));
}
