C++ CCodeChain::CreateLinkedList方法代码示例

ICCItem *fnAppend (CEvalContext *pCtx, ICCItem *pArgs, DWORD dwData)

//	fnAppend
//
//	Appends two or more elements together

	{
	int i, j;
	CCodeChain *pCC = pCtx->pCC;

	//	Create a new list to store the result in

	ICCItem *pResult = pCC->CreateLinkedList();
	if (pResult->IsError())
		return pResult;

	CCLinkedList *pList = (CCLinkedList *)pResult;

	//	Loop over all arguments and add to result list

	for (i = 0; i < pArgs->GetCount(); i++)
		{
		ICCItem *pItem = pArgs->GetElement(i);

		for (j = 0; j < pItem->GetCount(); j++)
			pList->Append(pCC, pItem->GetElement(j), NULL);
		}

	//	Done

	return pResult;
	}

ICCItem *fnApply (CEvalContext *pCtx, ICCItem *pArguments, DWORD dwData)

//	fnApply
//
//	Applies the given parameter list to the lambda expression
//
//	(apply exp arg1 arg2 ... argn list)

	{
	CCodeChain *pCC = pCtx->pCC;
	ICCItem *pArgs;
	ICCItem *pResult;
	ICCItem *pFunction;
	ICCItem *pLast;
	CCLinkedList *pList;
	int i;

	//	Evaluate the arguments and validate them

	pArgs = pCC->EvaluateArgs(pCtx, pArguments, CONSTLIT("v*"));
	if (pArgs->IsError())
		return pArgs;

	//	We better have at least two arguments

	if (pArgs->GetCount() < 2)
		{
		pArgs->Discard(pCC);
		return pCC->CreateError(CONSTLIT("apply needs a function and a list of arguments."), NULL);
		}

	//	The last argument better be a list

	pLast = pArgs->GetElement(pArgs->GetCount() - 1);
	if (!pLast->IsList())
		{
		pArgs->Discard(pCC);
		return pCC->CreateError(CONSTLIT("Last argument for apply must be a list."), NULL);
		}

	//	The first argument is the function

	pFunction = pArgs->Head(pCC);

	//	Create a new list to store the arguments in

	pResult = pCC->CreateLinkedList();
	if (pResult->IsError())
		{
		pArgs->Discard(pCC);
		return pResult;
		}

	pList = (CCLinkedList *)pResult;

	//	Add each of the arguments except the last

	for (i = 1; i < pArgs->GetCount() - 1; i++)
		{
		pList->Append(pCC, pArgs->GetElement(i), &pResult);
		if (pResult->IsError())
			{
			pList->Discard(pCC);
			pArgs->Discard(pCC);
			return pResult;
			}

		pResult->Discard(pCC);
		}

	//	Add each of the elements of the last list

	for (i = 0; i < pLast->GetCount(); i++)
		{
		pList->Append(pCC, pLast->GetElement(i), &pResult);
		if (pResult->IsError())
			{
			pList->Discard(pCC);
			pArgs->Discard(pCC);
			return pResult;
			}

		pResult->Discard(pCC);
		}

	//	Set the literal flag to indicate that the arguments should
	//	not be evaluated.

	pList->SetQuoted();

	//	Execute the function

	if (pFunction->IsFunction())
		pResult = pFunction->Execute(pCtx, pList);
	else
		pResult = pFunction->Reference();

	pList->Discard(pCC);

	//	Done
//.........这里部分代码省略.........

ICCItem *fnLinkedList (CEvalContext *pCtx, ICCItem *pArguments, DWORD dwData)

//	fnLinkedList
//
//	Handles linked-list specific functions
//
//	(lnkAppend linked-list item) -> list
//	(lnkRemove linked-list index) -> list
//	(lnkRemoveNil linked-list) -> list
//	(lnkReplace linked-list index item) -> list
//
//	HACK: This function has different behavior depending on the first
//	argument. If the first argument is a variable holding a linked list,
//	then the variable contents will be changed. If the variable holds Nil,
//	then the variable contents are not changed. In all cases, the caller
//	should structure the call as: (setq ListVar (lnkAppend ListVar ...))
//	in order to handle all cases.

	{
	CCodeChain *pCC = pCtx->pCC;
	ICCItem *pArgs;
	ICCItem *pList;
	CCLinkedList *pLinkedList;
	ICCItem *pResult;

	//	Evaluate the arguments

	if (dwData == FN_LINKEDLIST_APPEND)
		pArgs = pCC->EvaluateArgs(pCtx, pArguments, CONSTLIT("lv"));
	else if (dwData == FN_LINKEDLIST_REMOVE_NIL)
		pArgs = pCC->EvaluateArgs(pCtx, pArguments, CONSTLIT("l"));
	else
		pArgs = pCC->EvaluateArgs(pCtx, pArguments, CONSTLIT("liv"));
	if (pArgs->IsError())
		return pArgs;

	//	Get the linked list

	pList = pArgs->GetElement(0);
	if (pList->GetClass()->GetObjID() == OBJID_CCLINKEDLIST)
		pLinkedList = (CCLinkedList *)pList->Reference();
	else if (pList->IsNil())
		{
		pList = pCC->CreateLinkedList();
		if (pList->IsError())
			{
			pArgs->Discard(pCC);
			return pList;
			}
		pLinkedList = (CCLinkedList *)pList;
		}
	else
		{
		pArgs->Discard(pCC);
		return pCC->CreateError(CONSTLIT("Linked-list expected:"), NULL);
		}

	//	Do the right thing

	switch (dwData)
		{
		case FN_LINKEDLIST_APPEND:
			{
			ICCItem *pItem = pArgs->GetElement(1);
			ICCItem *pError;

			pLinkedList->Append(pCC, pItem, &pError);
			if (pError->IsError())
				{
				pLinkedList->Discard(pCC);
				pResult = pError;
				}
			else
				{
				pError->Discard(pCC);
				pResult = pLinkedList;
				}
			break;
			}

		case FN_LINKEDLIST_REMOVE:
			{
			int iIndex = pArgs->GetElement(1)->GetIntegerValue();

			//	Make sure we're in range

			if (iIndex < 0 || iIndex >= pLinkedList->GetCount())
				{
				pLinkedList->Discard(pCC);
				pResult = pCC->CreateError(CONSTLIT("Index out of range:"), pArgs->GetElement(1));
				}
			else
				{
				pLinkedList->RemoveElement(pCC, iIndex);
				pResult = pLinkedList;
				}

			break;
			}

//.........这里部分代码省略.........

ICCItem *fnPageMap (CEvalContext *pEvalCtx, ICCItem *pArgs, DWORD dwData)

//	fnPageMap
//
//	(pageMap address|pageID enumMethod ['excludeNil] var exp) -> filtered list

	{
	CCodeChain *pCC = pEvalCtx->pCC;

	//	Args

	ICCItem *pAddress = pArgs->GetElement(0);
	ICCItem *pMethod = pArgs->GetElement(1);

	bool bExcludeNil;
	int iOptionalArg = 2;
	if (pArgs->GetCount() > 4)
		bExcludeNil = strEquals(pArgs->GetElement(iOptionalArg++)->GetStringValue(), CONSTLIT("excludeNil"));
	else
		bExcludeNil = false;

	ICCItem *pVar = pArgs->GetElement(iOptionalArg++);
	ICCItem *pBody = pArgs->GetElement(iOptionalArg++);

	//	Open the page

	IPage *pPage;
	CString sError;
	if (g_PM.OpenPage(pAddress->GetStringValue(), &pPage, &sError) != NOERROR)
		return pCC->CreateError(sError, NULL);

	//	Prepare the method

	SPageEnumCtx EnumCtx;
	if (pPage->EnumReset(*pCC, pMethod, EnumCtx, &sError))
		{
		g_PM.ClosePage(pPage);
		return pCC->CreateError(sError, NULL);
		}

	//	Create a destination list

	ICCItem *pResult = pCC->CreateLinkedList();
	if (pResult->IsError())
		{
		g_PM.ClosePage(pPage);
		return pResult;
		}

	CCLinkedList *pList = (CCLinkedList *)pResult;

	//	Setup the locals. We start by creating a local symbol table

	ICCItem *pLocalSymbols = pCC->CreateSymbolTable();
	if (pLocalSymbols->IsError())
		{
		pResult->Discard(pCC);
		g_PM.ClosePage(pPage);
		return pLocalSymbols;
		}

	//	Associate the enumaration variable

	ICCItem *pError = pLocalSymbols->AddEntry(pCC, pVar, pCC->CreateNil());
	if (pError->IsError())
		{
		pLocalSymbols->Discard(pCC);
		pResult->Discard(pCC);
		g_PM.ClosePage(pPage);
		return pError;
		}

	pError->Discard(pCC);

	//	Setup the context

	if (pEvalCtx->pLocalSymbols)
		pLocalSymbols->SetParent(pEvalCtx->pLocalSymbols);
	else
		pLocalSymbols->SetParent(pEvalCtx->pLexicalSymbols);
	ICCItem *pOldSymbols = pEvalCtx->pLocalSymbols;
	pEvalCtx->pLocalSymbols = pLocalSymbols;

	//	Get the offset of the variable so we don't have to
	//	search for it all the time

	int iVarOffset = pLocalSymbols->FindOffset(pCC, pVar);

	//	Enumerate the page

	while (pPage->EnumHasMore(EnumCtx))
		{
		ICCItem *pItem = pPage->EnumGetNext(*pCC, EnumCtx);
		if (pItem->IsError())
			{
			pResult->Discard(pCC);
			pResult = pItem;
			break;
			}

//.........这里部分代码省略.........

ICCItem *fnPageGet (CEvalContext *pEvalCtx, ICCItem *pArgs, DWORD dwData)

//	fnPageGet
//
//	(pageGet address|pageID enumMethod [startIndex] [count]) -> list

	{
	CCodeChain *pCC = pEvalCtx->pCC;

	//	Args

	ICCItem *pAddress = pArgs->GetElement(0);
	ICCItem *pMethod = pArgs->GetElement(1);
	int iStart = (pArgs->GetCount() > 2 ? pArgs->GetElement(2)->GetIntegerValue() : 0);
	int iCount = (pArgs->GetCount() > 3 ? pArgs->GetElement(3)->GetIntegerValue() : -1);

	//	Open the page

	IPage *pPage;
	CString sError;
	if (g_PM.OpenPage(pAddress->GetStringValue(), &pPage, &sError) != NOERROR)
		return pCC->CreateError(sError, NULL);

	//	Prepare the method

	SPageEnumCtx EnumCtx;
	if (pPage->EnumReset(*pCC, pMethod, EnumCtx, &sError))
		{
		g_PM.ClosePage(pPage);
		return pCC->CreateError(sError, NULL);
		}

	//	Create a destination list

	ICCItem *pResult = pCC->CreateLinkedList();
	if (pResult->IsError())
		{
		g_PM.ClosePage(pPage);
		return pResult;
		}

	CCLinkedList *pList = (CCLinkedList *)pResult;

	//	Enumerate the page

	while ((iCount == -1 || iCount > 0) && pPage->EnumHasMore(EnumCtx))
		{
		ICCItem *pItem = pPage->EnumGetNext(*pCC, EnumCtx);
		if (pItem->IsError())
			{
			pResult->Discard(pCC);
			pResult = pItem;
			break;
			}

		//	Add to list

		if (iStart == 0)
			{
			pList->Append(*pCC, pItem);
			iCount--;
			}
		else
			iStart--;

		pItem->Discard(pCC);
		}

	//	Clean up

	g_PM.ClosePage(pPage);

	//	Done

	if (pResult->GetCount() > 0)
		return pResult;
	else
		{
		pResult->Discard(pCC);
		return pCC->CreateNil();
		}
	}

ICCItem *CCLambda::Execute (CEvalContext *pCtx, ICCItem *pArgs)

//	Execute
//
//	Executes the function and returns a result

	{
	CCodeChain *pCC = pCtx->pCC;
	ICCItem *pItem;
	ICCItem *pOldSymbols;
	ICCItem *pLocalSymbols;
	ICCItem *pVar;
	ICCItem *pArg;
	ICCItem *pResult;
	int i;
	BOOL bNoEval;

	//	We must have been initialized

	if (m_pArgList == NULL || m_pCode == NULL)
		return pCC->CreateNil();

	//	If the argument list if quoted, then it means that the arguments
	//	have already been evaluated. This happens if we've been called by
	//	(apply).

	bNoEval = pArgs->IsQuoted();

	//	Set up the symbol table

	pLocalSymbols = pCC->CreateSymbolTable();
	if (pLocalSymbols->IsError())
		return pLocalSymbols;

	//	Loop over each item and associate it

	for (i = 0; i < m_pArgList->GetCount(); i++)
		{
		pVar = m_pArgList->GetElement(i);
		pArg = pArgs->GetElement(i);

		//	If the name of this variable is %args, then the rest of the arguments
		//	should go into a list

		if (strCompareAbsolute(pVar->GetStringValue(), CONSTLIT("%args")) == 0)
			{
			ICCItem *pVarArgs;

			//	If there are arguments left, add them to a list

			if (pArg)
				{
				int j;
				ICCItem *pError;
				CCLinkedList *pList;

				//	Create a list

				pVarArgs = pCC->CreateLinkedList();
				if (pVarArgs->IsError())
					{
					pLocalSymbols->Discard(pCC);
					return pVarArgs;
					}
				pList = (CCLinkedList *)pVarArgs;

				//	Add each argument to the list

				for (j = i; j < pArgs->GetCount(); j++)
					{
					pArg = pArgs->GetElement(j);

					if (bNoEval)
						pResult = pArg->Reference();
					else
						pResult = pCC->Eval(pCtx, pArg);

					pList->Append(pCC, pResult, &pError);
					pResult->Discard(pCC);
					if (pError->IsError())
						{
						pVarArgs->Discard(pCC);
						pLocalSymbols->Discard(pCC);
						return pError;
						}

					pError->Discard(pCC);
					}
				}
			else
				pVarArgs = pCC->CreateNil();

			//	Add to the local symbol table

			pItem = pLocalSymbols->AddEntry(pCC, pVar, pVarArgs);
			pVarArgs->Discard(pCC);
			}

		//	Bind the variable to the argument

//.........这里部分代码省略.........