/// <summary>
/// Called when the item is an if 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(IfItem target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
target.Exp.Accept(this);
using (tree.Block(true))
target.Block.Accept(this);
for (int i = 0; i < target.Elses.Count; i++)
{
using (tree.Block(true))
{
target.Elses[i].Expression.Accept(this);
target.Elses[i].Block.Accept(this);
}
}
if (target.ElseBlock != null)
{
using (tree.Block(true))
target.ElseBlock.Accept(this);
}
return(target);
}
public IParseItem Visit(IfItem target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
target.Expression.Accept(this);
using (_tree.Block(true)) {
target.Block.Accept(this);
}
foreach (IfItem.ElseInfo info in target.Elses)
{
using (_tree.Block(true)) {
info.Expression.Accept(this);
info.Block.Accept(this);
}
}
if (target.ElseBlock != null)
{
using (_tree.Block(true)) {
target.ElseBlock.Accept(this);
}
}
return(target);
}
public IParseItem Visit(IfItem target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
ILGenerator gen = _compiler.CurrentGenerator;
Label next = gen.DefineLabel();
Label end = gen.DefineLabel();
// if (!{Exp}.IsTrue) goto next;
target.Expression.Accept(this);
gen.Emit(OpCodes.Callvirt,
typeof(ILuaValue).GetProperty(nameof(ILuaValue.IsTrue)).GetGetMethod());
gen.Emit(OpCodes.Brfalse, next);
// {Block}
target.Block.Accept(this);
// goto end;
gen.Emit(OpCodes.Br, end);
// next:
gen.MarkLabel(next);
foreach (var item in target.Elses)
{
// if (!{item.Item1}.IsTrue) goto next;
next = gen.DefineLabel();
item.Expression.Accept(this);
gen.Emit(OpCodes.Callvirt,
typeof(ILuaValue).GetProperty(nameof(ILuaValue.IsTrue)).GetGetMethod());
gen.Emit(OpCodes.Brfalse, next);
// {item.Item2}
item.Block.Accept(this);
// goto end;
gen.Emit(OpCodes.Br, end);
// next:
gen.MarkLabel(next);
}
if (target.ElseBlock != null)
{
target.ElseBlock.Accept(this);
}
// end:
gen.MarkLabel(end);
return(target);
}
