/// <summary>
/// Called when the item is a function definition 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(FuncDefItem target)
{
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
var gen = compiler.CurrentGenerator;
ChunkBuilder.VarDefinition field = null;
string name = null;
bool store = false;
if (target.Local)
{
// local function definition.
if (target.InstanceName != null)
{
throw new SyntaxException(Resources.InstanceLocalMethod, target.Debug);
}
if (!(target.Prefix is NameItem))
{
throw new SyntaxException(Resources.IndexerLocalMethod, target.Debug);
}
NameItem namei = (NameItem)target.Prefix;
name = namei.Name;
field = compiler.DefineLocal(namei);
field.StartSet();
}
else if (target.Prefix != null)
{
if (target.InstanceName != null)
{
// instance function definition.
name = null;
if (target.Prefix is NameItem)
{
name = ((NameItem)target.Prefix).Name;
}
else
{
name = (string)((LiteralItem)((IndexerItem)target.Prefix).Expression).Value;
}
name += ":" + target.InstanceName;
// {Prefix}.SetIndex({InstanceName}, {ImplementFunction(..)})
target.Prefix.Accept(this);
gen.Emit(OpCodes.Ldarg_1);
gen.Emit(OpCodes.Callvirt, typeof(ILuaEnvironment).GetProperty(nameof(ILuaEnvironment.Runtime)).GetGetMethod());
gen.Emit(OpCodes.Ldstr, target.InstanceName);
gen.Emit(OpCodes.Callvirt, typeof(ILuaRuntime).GetMethod(nameof(ILuaRuntime.CreateValue)));
store = true;
}
else if (target.Prefix is IndexerItem)
{
// global function definition with indexer
// {Prefix}.SetIndex({Expression}, {ImplementFunction(..)})
IndexerItem index = (IndexerItem)target.Prefix;
name = (string)((LiteralItem)index.Expression).Value;
index.Prefix.Accept(this);
index.Expression.Accept(this);
store = true;
}
else
{
// global function definition with name
name = ((NameItem)target.Prefix).Name;
field = compiler.FindVariable((NameItem)target.Prefix);
field.StartSet();
}
}
compiler.ImplementFunction(this, target, name);
if (field != null)
{
field.EndSet();
}
else if (store)
{
gen.Emit(OpCodes.Callvirt, typeof(ILuaValue).GetMethod(nameof(ILuaValue.SetIndex)));
}
return(target);
}
