/////////////////////////////////////////////////////////////////////////////
public static Invoker GetIndexerInvoker( object parent, string indexerName, TypeHelperDictionary typeHelpers )
{
// ******
var objInfo = new ObjectInfo( parent, indexerName );
if( objInfo.IsIndexer ) {
return new IndexerInvoker( objInfo );
}
// ******
INmpDynamic dyn = parent as INmpDynamic;
if( null != dyn && dyn.HasIndexer(indexerName) ) {
return new DynamicIndexerInvoker( parent, indexerName);
}
// ******
object standin = typeHelpers.GetHelper( parent );
if( null != standin ) {
objInfo = new ObjectInfo( standin, indexerName );
if( objInfo.IsIndexer ) {
return new IndexerInvoker( objInfo );
}
}
// ******
return null;
}
/////////////////////////////////////////////////////////////////////////////
//public static TypeHelperDictionary TypeHelpers { get { return ThreadContext.TypeHelpers; } }
/////////////////////////////////////////////////////////////////////////////
public static Invoker GetMethodInvoker( object parent, string methodName, TypeHelperDictionary typeHelpers )
{
// ******
var objInfo = new ObjectInfo( parent, methodName );
if( objInfo.IsMethod ) {
return new MethodInvoker( objInfo );
}
// ******
INmpDynamic dyn = parent as INmpDynamic;
if( null != dyn ) {
if( dyn.HasMethod(methodName) ) {
return new DynamicMethodInvoker( parent, methodName );
}
}
// ******
object standin = typeHelpers.GetHelper( parent );
if( null != standin ) {
objInfo = new ObjectInfo( standin, methodName );
if( objInfo.IsMethod ) {
return new MethodInvoker( objInfo );
}
}
// ******
return null;
}
/////////////////////////////////////////////////////////////////////////////
public ExpressionEvaluatorBase( IMacroProcessor mp )
{
macroProcessor = mp;
typeHelpers = mp.Get<TypeHelperDictionary>();
}
/////////////////////////////////////////////////////////////////////////////
public static object EvalIndexerHelper( object objIn, object [] args, TypeHelperDictionary typeHelpers )
{
// ******
//
// expression: macro[ ... ]
//
// expression: macro.something[ x ][ y ], or macro.something( z )[ zz ]
//
object objResult = null;
// ******
Invoker invoker = objIn as Invoker;
if( null != invoker ) {
objResult = invoker.Invoke( args );
}
else {
invoker = Invokers.GetDefaultIndexer( objIn, typeHelpers );
if( null == invoker ) {
ThreadContext.MacroError( "there is no default indexer for the object type \"{0}\"", ObjectInfo.GetTypeName(objIn) );
}
objResult = invoker.Invoke( args );
}
// ******
return objResult;
}
/////////////////////////////////////////////////////////////////////////////
public static object EvalMemberHelper( object parent, string memberName, TypeHelperDictionary typeHelpers )
{
// ******
object value;
// ******
var oo = new ObjectInfo( parent, memberName );
if( null != (value = oo.GetValue()) ) {
return value;
}
// ******
INmpDynamic dyn = parent as INmpDynamic;
if( null != dyn ) {
NmpDynamicType dynType = dyn.HasMember( memberName );
switch( dynType ) {
case NmpDynamicType.None:
break;
case NmpDynamicType.Property:
return DynamicPropertyInvoker.Invoke( parent, memberName );
case NmpDynamicType.Indexer:
return new DynamicIndexerInvoker( parent, memberName );
case NmpDynamicType.Method:
return new DynamicMethodInvoker( parent, memberName );
}
}
// ******
object standin = typeHelpers.GetHelper( parent );
if( null != standin ) {
oo = new ObjectInfo( standin, memberName );
if( null != (value = oo.GetValue()) ) {
return value;
}
}
// ******
return null;
}
/////////////////////////////////////////////////////////////////////////////
public static Invoker GetDefaultIndexer( object parent, TypeHelperDictionary typeHelpers )
{
//
// looks up default indexer name and then calls GetIndexerInvoker() - above
//
// ******
Type objectType = ObjectInfo.GetObjectType( parent );
object [] customAttrs = objectType.GetCustomAttributes( typeof(DefaultMemberAttribute), true );
// ******
string memberName = string.Empty;
if( 0 == customAttrs.Length ) {
//var methods = objectType.GetMethods();
//if( 0 == methods.Length ) {
// return null;
//}
//
//
//is array use Get ??
//
//bool found = false;
//foreach( MethodInfo method in methods ) {
// if( method.Name == "Item" ) {
// found = true;
// break;
// }
//}
//
//if( ! found ) {
// return null;
//}
//
//memberName = "Item";
if( objectType.IsArray ) {
memberName = "GetValue";
}
else {
return null;
}
}
else {
memberName = ((DefaultMemberAttribute) customAttrs [ 0 ]).MemberName;
}
// ******
return GetIndexerInvoker( parent, memberName, typeHelpers );
}