/// <summary>
/// Emits code to prepare an evaluation stack for storing a value into a variable.
/// Supports operators chaining. Store is finished by calling <see cref="EmitAssign"/>.
/// </summary>
/// <param name="codeGenerator"></param>
private PhpTypeCode EmitNodeWrite(CodeGenerator codeGenerator)
{
ChainBuilder chain = codeGenerator.ChainBuilder;
if (chain.IsArrayItem)
{
// 3: a_[x]_[v]
Debug.Assert(this.isMemberOf == null);
return(chain.EmitEnsureItem(array, index, true));
}
// 1, 2, 4, 5, 6, 7
if (chain.IsMember)
{
// 4, 5
if (this.isMemberOf != null)
{
// 5: ...->a[]->...
// Store isMemberOf for lazy emit
chain.SetObjectForLazyEmit(this);
chain.IsArrayItem = true;
chain.IsLastMember = false;
}
else
{
// 4: a_[x]_->c->..., a[x]_[x]_->c->...
chain.IsArrayItem = true;
chain.IsLastMember = true;
}
PhpTypeCode result = chain.EmitEnsureItem(array, index, false);
chain.IsArrayItem = false;
return(result);
}
// 1, 2, 6, 7
if (this.isMemberOf != null)
{
// 6, 7: ...->a[x]_[x]_
chain.Create();
chain.Begin();
// Store isMemberOf for lazy emit
chain.SetObjectForLazyEmit(this);
chain.IsArrayItem = true;
chain.IsLastMember = false;
chain.Lengthen(); // for own []
array.Emit(codeGenerator);
indexTypeCode = codeGenerator.EmitArrayKey(chain, index);
// Note that EmitAssign will finish the work (SetArrayItem or PhpArray.Add)
return(PhpTypeCode.Unknown);
}
// 1, 2
Debug.Assert(this.isMemberOf == null);
if (array is ItemUse || array is DirectStFldUse || array is IndirectStFldUse /* ??? */)
{
// 2: a[]_[]_
chain.Create();
chain.Begin();
chain.IsArrayItem = true;
chain.IsLastMember = true;
array.Emit(codeGenerator);
indexTypeCode = codeGenerator.EmitArrayKey(chain, index);
// Note that further work will be done by EmitAssign (SetArrayItem or PhpArray.Add)
return(PhpTypeCode.Unknown);
}
// 1: a_[x]_
// Do nothing now, let the work be done in EmitAssign()
return(PhpTypeCode.Unknown);
}
