/// <summary>
/// Emits code to load variable onto the evaluation stack. Supports operators chaining.
/// </summary>
/// <param name="codeGenerator">A geenrator.</param>
/// <param name="itemGetterKind">Whether to load for "get", "isset", or "empty".</param>
private PhpTypeCode EmitNodeRead(CodeGenerator /*!*/ codeGenerator, Operators.GetItemKinds itemGetterKind)
{
ChainBuilder chain = codeGenerator.ChainBuilder;
PhpTypeCode result;
if (chain.IsArrayItem)
{
// we are in the array subchain //
// 3: a_[x]_[x]
chain.Lengthen(); // for []
result = chain.EmitGetItem(array, index, itemGetterKind);
return(result);
}
// 1,2,4,5,6,7
if (chain.IsMember)
{
// we are in the field chain //
// 4, 5
if (this.isMemberOf != null)
{
// we are in the middle of the field chain //
// 5: ...->a[]->...
// Lengthen chain for isMemberOf
chain.Lengthen(); // for hop over ->
isMemberOf.Emit(codeGenerator);
// Lengthen chain for own []
chain.Lengthen();
chain.IsArrayItem = true;
chain.IsLastMember = false;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
return(result);
}
else
{
// we are at the beginning of the field chain //
// 4: a[x]->...
// Lengthen chain for itself
chain.Lengthen(); // for own []
chain.IsArrayItem = true;
chain.IsLastMember = true;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
return(result);
}
}
// 1, 2, 6, 7
if (this.isMemberOf != null)
{
// last node of the field chain //
// 6 , 7: ...->a[]_[]_ , ...->a_[]_
bool quiet_read = chain.QuietRead;
chain.Create();
chain.Begin();
chain.QuietRead = quiet_read;
chain.Lengthen(); // for hop over ->
isMemberOf.Emit(codeGenerator);
// let's emit the array subchain followed by the GetItem:
chain.IsArrayItem = true;
chain.IsLastMember = false;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
chain.End();
return(result);
}
// 1, 2
if (array is ItemUse || array is DirectStFldUse || array is IndirectStFldUse)
{
// we are at the beginning of the field chain //
// 2: a[]_[]_
bool quiet_read = chain.QuietRead;
chain.Create();
chain.Begin();
chain.QuietRead = quiet_read;
chain.IsArrayItem = true;
chain.IsLastMember = true;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
chain.End();
return(result);
}
// no chains //
// 1: a_[x]_
chain.IsArrayItem = true;
chain.IsLastMember = true;
result = chain.EmitGetItem(array, index, itemGetterKind);
chain.IsArrayItem = false;
return(result);
}