/// <summary>
/// Called when the item is a while item.
/// </summary>
/// <param name="target">The object that was passed to IParseItem.Visit.</param>
/// <returns>The passed target or a modification of it.</returns>
/// <exception cref="System.ArgumentNullException">If target is null.</exception>
public IParseItem Visit(WhileItem target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
ILGenerator gen = compiler.CurrentGenerator;
target.Break.UserData = target.Break.UserData ?? gen.DefineLabel();
Label start = gen.DefineLabel();
Label end = (Label)target.Break.UserData;
// start:
gen.MarkLabel(start);
// if (!{Exp}.IsTrue) goto end;
target.Exp.Accept(this);
gen.Emit(OpCodes.Callvirt, typeof(ILuaValue).GetProperty(nameof(ILuaValue.IsTrue)).GetGetMethod());
gen.Emit(OpCodes.Brfalse, end);
// {Block}
target.Block.Accept(this);
// goto start;
gen.Emit(OpCodes.Br, start);
// end:
gen.MarkLabel(end);
return(target);
}
public IParseItem Visit(WhileItem target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
target.Expression.Accept(this);
using (_tree.Block(true)) {
_tree.DefineLabel(target.Break);
target.Block.Accept(this);
}
return(target);
}
