private Expression CreateListSet(Expression source, Expression destination, CompileArgument arg)
{
//### IList<T>
//for (var i = 0, len = src.Count; i < len; i++) {
// var item = src[i];
// dest.Add(convert(item));
//}
//### IEnumerable<T>
//foreach (var item in src)
// dest.Add(convert(item));
var sourceElementType = source.Type.ExtractCollectionType();
var destinationElementType = destination.Type.ExtractCollectionType();
var item = Expression.Variable(sourceElementType, "item");
var getter = CreateAdaptExpression(item, destinationElementType, arg);
var addMethod = destination.Type.GetMethod("Add", new[] { destinationElementType });
var set = Expression.Call(
destination,
addMethod,
getter);
var loop = ExpressionEx.ForLoop(source, item, set);
return(loop);
}
private Expression CreateArraySet(Expression source, Expression destination, CompileArgument arg)
{
//### IList<T>
//var v = 0
//for (var i = 0, len = src.Count; i < len; i++) {
// var item = src[i];
// dest[v++] = convert(item);
//}
//### IEnumerable<T>
//var v = 0;
//foreach (var item in src)
// dest[v++] = convert(item);
var sourceElementType = source.Type.ExtractCollectionType();
var destinationElementType = destination.Type.ExtractCollectionType();
var item = Expression.Variable(sourceElementType, "item");
var v = Expression.Variable(typeof(int), "v");
var start = Expression.Assign(v, Expression.Constant(0));
var getter = CreateAdaptExpression(item, destinationElementType, arg);
var set = Expression.Assign(
Expression.ArrayAccess(destination, Expression.PostIncrementAssign(v)),
getter);
var loop = ExpressionEx.ForLoop(source, item, set);
return(Expression.Block(new[] { v }, start, loop));
}
private Expression CreateArraySet(Expression source, Expression destination, CompileArgument arg)
{
//var v0 = 0, v1 = 0;
//var vlen0 = dest.GetLength(0), vlen1 = dest.GetLength(1);
//for (var i = 0, len = src.Count; i < len; i++) {
// var item = src[i];
// dest[v0, v1] = convert(item);
// v1++;
// if (v1 >= vlen1) {
// v1 = 0;
// v0++;
// }
//}
var sourceElementType = source.Type.ExtractCollectionType();
var destinationElementType = destination.Type.ExtractCollectionType();
var item = Expression.Variable(sourceElementType, "item");
var vx = Enumerable.Range(0, destination.Type.GetArrayRank())
.Select(i => Expression.Variable(typeof(int), "v" + i))
.ToList();
var vlenx = Enumerable.Range(0, destination.Type.GetArrayRank())
.Select(i => Expression.Variable(typeof(int), "vlen" + i))
.ToList();
var block = new List <Expression>();
block.AddRange(vx.Select(v => Expression.Assign(v, Expression.Constant(0))));
var method = typeof(Array).GetMethod("GetLength", new[] { typeof(int) });
block.AddRange(
vlenx.Select((vlen, i) =>
Expression.Assign(
vlen,
Expression.Call(destination, method, Expression.Constant(i)))));
var getter = CreateAdaptExpression(item, destinationElementType, arg);
var set = ExpressionEx.Assign(
Expression.ArrayAccess(destination, vx),
getter);
Expression ifExpr = Expression.Block(
Expression.Assign(vx[1], Expression.Constant(0)),
Expression.PostIncrementAssign(vx[0]));
for (var i = 1; i < vx.Count; i++)
{
var list = new List <Expression>();
if (i + 1 < vx.Count)
{
list.Add(Expression.Assign(vx[i + 1], Expression.Constant(0)));
}
list.Add(Expression.PostIncrementAssign(vx[i]));
list.Add(Expression.IfThen(
Expression.GreaterThanOrEqual(vx[i], vlenx[i]),
ifExpr));
ifExpr = Expression.Block(list);
}
var loop = ExpressionEx.ForLoop(source, item, set, ifExpr);
block.Add(loop);
return(Expression.Block(vx.Concat(vlenx), block));
}
