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Diffstat (limited to 'dom/xslt/xpath/txNodeSet.h')
| -rw-r--r-- | dom/xslt/xpath/txNodeSet.h | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txNodeSet.h b/dom/xslt/xpath/txNodeSet.h new file mode 100644 index 000000000..bd33be628 --- /dev/null +++ b/dom/xslt/xpath/txNodeSet.h @@ -0,0 +1,217 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/** + * Implementation of an XPath NodeSet + */ + +#ifndef txNodeSet_h__ +#define txNodeSet_h__ + +#include "txExprResult.h" +#include "nsError.h" +#include "txXPathNode.h" + +class txNodeSet : public txAExprResult +{ +public: + /** + * Creates a new empty NodeSet + */ + explicit txNodeSet(txResultRecycler* aRecycler); + + /** + * Creates a new NodeSet with one node. + */ + txNodeSet(const txXPathNode& aNode, txResultRecycler* aRecycler); + + /** + * Creates a new txNodeSet, copying the node references from the source + * NodeSet. + */ + txNodeSet(const txNodeSet& aSource, txResultRecycler* aRecycler); + + /** + * Destructor for txNodeSet, deletes the nodes. + */ + virtual ~txNodeSet(); + + /** + * Adds the specified txXPathNode to this NodeSet if it is not already + * in this NodeSet. The node is inserted according to document order. + * + * @param aNode the txXPathNode to add to the NodeSet + * @return errorcode. + */ + nsresult add(const txXPathNode& aNode); + + /** + * Adds the nodes in specified NodeSet to this NodeSet. The resulting + * NodeSet is sorted in document order and does not contain any duplicate + * nodes. + * + * @param aNodes the NodeSet to add, must be in document order. + * @return errorcode. + */ + nsresult add(const txNodeSet& aNodes); + nsresult addAndTransfer(txNodeSet* aNodes); + + /** + * Append API + * These functions should be used with care. + * They are intended to be used when the caller assures that the resulting + * NodeSet remains in document order. + * Abuse will break document order, and cause errors in the result. + * These functions are significantly faster than the add API, as no + * order info operations will be performed. + */ + + /** + * Appends the specified Node to the end of this NodeSet + * @param aNode the Node to append to the NodeSet + * @return errorcode. + */ + nsresult append(const txXPathNode& aNode); + + /** + * Appends the nodes in the specified NodeSet to the end of this NodeSet + * @param aNodes the NodeSet to append to the NodeSet + * @return errorcode. + */ + nsresult append(const txNodeSet& aNodes); + + /** + * API to implement reverse axes in LocationStep. + * + * Before adding nodes to the nodeset for a reversed axis, call + * setReverse(). This will make the append(aNode) and get() methods treat + * the nodeset as required. Do only call append(aNode), get(), mark() + * and sweep() while the nodeset is reversed. + * Afterwards, call unsetReverse(). The nodes are stored in document + * order internally. + */ + void setReverse() + { + mDirection = -1; + } + void unsetReverse() + { + mDirection = 1; + } + + /** + * API to implement predicates in PredicateExpr + * + * mark(aIndex) marks the specified member of the nodeset. + * sweep() clears all members of the nodeset that haven't been + * marked before and clear the mMarks array. + */ + nsresult mark(int32_t aIndex); + nsresult sweep(); + + /** + * Removes all nodes from this nodeset + */ + void clear(); + + /** + * Returns the index of the specified Node, + * or -1 if the Node is not contained in the NodeSet + * @param aNode the Node to get the index for + * @param aStart index to start searching at + * @return index of specified node or -1 if the node does not exist + */ + int32_t indexOf(const txXPathNode& aNode, uint32_t aStart = 0) const; + + /** + * Returns true if the specified Node is contained in the set. + * @param aNode the Node to search for + * @return true if specified Node is contained in the NodeSet + */ + bool contains(const txXPathNode& aNode) const + { + return indexOf(aNode) >= 0; + } + + /** + * Returns the Node at the specified node in this NodeSet. + * @param aIndex the node of the Node to return + * @return Node at specified node + */ + const txXPathNode& get(int32_t aIndex) const; + + /** + * Returns true if there are no Nodes in the NodeSet. + * @return true if there are no Nodes in the NodeSet. + */ + bool isEmpty() const + { + return mStart ? mStart == mEnd : true; + } + + /** + * Returns the number of elements in the NodeSet + * @return the number of elements in the NodeSet + */ + int32_t size() const + { + return mStart ? mEnd - mStart : 0; + } + + TX_DECL_EXPRRESULT + +private: + /** + * Ensure that this nodeset can take another aSize nodes. + * + * Changes mStart and mEnd as well as mBufferStart and mBufferEnd. + */ + bool ensureGrowSize(int32_t aSize); + + /** + * Finds position in the buffer where a node should be inserted + * to keep the nodeset in document order. Searches the positions + * aFirst-aLast, including aFirst, but not aLast. + * @param aNode Node to find insert position for. + * @param aFirst First item of the search range, included. + * @param aLast Last item of the search range, excluded. + * @param aDupe out-param. Will be set to true if the node already + * exists in the NodeSet, false if it should be + * inserted. + * @return pointer where to insert the node. The node should be inserted + * before the given node. This value is always set, even if aNode + * already exists in the NodeSet + */ + txXPathNode* findPosition(const txXPathNode& aNode, + txXPathNode* aFirst, + txXPathNode* aLast, bool& aDupe) const; + + static void copyElements(txXPathNode* aDest, const txXPathNode* aStart, + const txXPathNode* aEnd); + static void transferElements(txXPathNode* aDest, const txXPathNode* aStart, + const txXPathNode* aEnd); + static void destroyElements(const txXPathNode* aStart, + const txXPathNode* aEnd) + { + while (aStart < aEnd) { + aStart->~txXPathNode(); + ++aStart; + } + } + + typedef void (*transferOp) (txXPathNode* aDest, const txXPathNode* aStart, + const txXPathNode* aEnd); + typedef void (*destroyOp) (const txXPathNode* aStart, + const txXPathNode* aEnd); + nsresult add(const txNodeSet& aNodes, transferOp aTransfer, + destroyOp aDestroy); + + txXPathNode *mStart, *mEnd, *mStartBuffer, *mEndBuffer; + int32_t mDirection; + // used for mark() and sweep() in predicates + bool* mMarks; +}; + +#endif |