307 lines
8.9 KiB
C++
307 lines
8.9 KiB
C++
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is TransforMiiX XSLT processor.
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*
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* The Initial Developer of the Original Code is The MITRE Corporation.
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* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
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*
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* Portions created by Keith Visco as a Non MITRE employee,
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* (C) 1999 Keith Visco. All Rights Reserved.
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*
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* Contributor(s):
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* Keith Visco, kvisco@ziplink.net
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* -- original author.
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* Bob Miller, kbob@oblix.com
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* -- plugged core leak.
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*
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* $Id: PathExpr.cpp,v 1.1 2000-04-06 07:45:36 kvisco%ziplink.net Exp $
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*/
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#include "Expr.h"
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//------------/
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//- PathExpr -/
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//------------/
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/**
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* Creates a new PathExpr
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**/
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PathExpr::PathExpr() {
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//-- do nothing
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}
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/**
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* Destructor, will delete all Pattern Expressions
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**/
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PathExpr::~PathExpr() {
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ListIterator* iter = expressions.iterator();
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while ( iter->hasNext() ) {
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iter->next();
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PathExprItem* pxi = (PathExprItem*)iter->remove();
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delete pxi->pExpr;
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delete pxi;
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}
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delete iter;
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} //-- ~PathExpr
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/**
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* Adds the PatternExpr to this PathExpr
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* @param expr the Expr to add to this PathExpr
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* @param index the index at which to add the given Expr
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**/
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void PathExpr::addPatternExpr(int index, PatternExpr* expr, short ancestryOp) {
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if (expr) {
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PathExprItem* pxi = new PathExprItem;
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pxi->pExpr = expr;
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pxi->ancestryOp = ancestryOp;
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expressions.insert(index, pxi);
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}
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} //-- addPattenExpr
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/**
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* Adds the PatternExpr to this PathExpr
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* @param expr the Expr to add to this PathExpr
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**/
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void PathExpr::addPatternExpr(PatternExpr* expr, short ancestryOp) {
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if (expr) {
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PathExprItem* pxi = new PathExprItem;
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pxi->pExpr = expr;
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pxi->ancestryOp = ancestryOp;
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expressions.add(pxi);
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}
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} //-- addPattenExpr
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MBool PathExpr::isAbsolute() {
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if ( expressions.getLength() > 0 ) {
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ListIterator* iter = expressions.iterator();
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PathExprItem* pxi = (PathExprItem*)iter->next();
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delete iter;
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return (pxi->ancestryOp != RELATIVE_OP);
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}
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return MB_FALSE;
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} //-- isAbsolute
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//------------------------------------/
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//- Virtual methods from PatternExpr -/
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//------------------------------------/
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/**
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* Evaluates this Expr based on the given context node and processor state
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* @param context the context node for evaluation of this Expr
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* @param ps the ContextState containing the stack information needed
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* for evaluation
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* @return the result of the evaluation
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**/
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ExprResult* PathExpr::evaluate(Node* context, ContextState* cs) {
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//-- add selectExpr functionality here
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if ( (!context) || (expressions.getLength() == 0))
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return new NodeSet(0);
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NodeSet* nodes = new NodeSet();
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if ((isAbsolute()) && (context->getNodeType() != Node::DOCUMENT_NODE))
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nodes->add(context->getOwnerDocument());
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else
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nodes->add(context);
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ListIterator* iter = expressions.iterator();
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MBool ancestorMode = MB_FALSE;
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while ( iter->hasNext() ) {
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PathExprItem* pxi = (PathExprItem*)iter->next();
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ancestorMode = (ancestorMode || (pxi->ancestryOp == ANCESTOR_OP));
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NodeSet* tmpNodes = 0;
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cs->getNodeSetStack()->push(nodes);
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for (int i = 0; i < nodes->size(); i++) {
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Node* node = nodes->get(i);
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#if 0
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NodeSet* xNodes = (NodeSet*) pxi->pExpr->evaluate(node, cs);
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#else
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ExprResult *res = pxi->pExpr->evaluate(node, cs);
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if (!res || res->getResultType() != ExprResult::NODESET)
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continue;
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NodeSet* xNodes = (NodeSet *) res;
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#endif
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if ( tmpNodes ) {
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xNodes->copyInto(*tmpNodes);
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}
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else {
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tmpNodes = xNodes;
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xNodes = 0;
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}
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delete xNodes;
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//-- handle ancestorMode
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if ( ancestorMode ) fromDescendants(pxi->pExpr, node, cs, tmpNodes);
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}
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delete (NodeSet*) cs->getNodeSetStack()->pop();
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nodes = tmpNodes;
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if ( nodes->size() == 0 ) break;
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}
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delete iter;
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return nodes;
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} //-- evaluate
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/**
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* Selects from the descendants of the context node
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* all nodes that match the PatternExpr
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* -- this will be moving to a Utility class
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**/
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void PathExpr::fromDescendants
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(PatternExpr* pExpr, Node* context, ContextState* cs, NodeSet* nodes)
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{
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if (( !context ) || (! pExpr )) return;
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NodeList* nl = context->getChildNodes();
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for (int i = 0; i < nl->getLength(); i++) {
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Node* child = nl->item(i);
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if (pExpr->matches(child, context, cs))
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nodes->add(child);
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//-- check childs descendants
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if (child->hasChildNodes())
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fromDescendants(pExpr, child, cs, nodes);
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}
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} //-- fromDescendants
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/**
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* Returns the default priority of this Pattern based on the given Node,
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* context Node, and ContextState.
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* If this pattern does not match the given Node under the current context Node and
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* ContextState then Negative Infinity is returned.
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**/
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double PathExpr::getDefaultPriority(Node* node, Node* context, ContextState* cs) {
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if ( matches(node, context, cs) ) {
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int size = expressions.getLength();
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if ( size == 1) {
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ListIterator* iter = expressions.iterator();
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PathExprItem* pxi = (PathExprItem*)iter->next();
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delete iter;
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return pxi->pExpr->getDefaultPriority(node, context, cs);
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}
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else if ( size > 1 ) {
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return 0.5;
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}
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}
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return Double::NEGATIVE_INFINITY;
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} //-- getDefaultPriority
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/**
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* Determines whether this PatternExpr matches the given node within
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* the given context
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**/
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MBool PathExpr::matches(Node* node, Node* context, ContextState* cs) {
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if ( (!node) || (expressions.getLength() == 0))
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return MB_FALSE;
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NodeSet nodes;
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nodes.add(node);
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ListIterator* iter = expressions.iterator();
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iter->reverse();
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NodeSet tmpNodes;
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MBool result = MB_FALSE;
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while ( iter->hasNext() ) {
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PathExprItem* pxi = (PathExprItem*)iter->next();
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for (int i = 0; i < nodes.size(); i++) {
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Node* tnode = nodes.get(i);
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//-- select node's parent or ancestors
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switch (pxi->ancestryOp) {
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case ANCESTOR_OP:
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{
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Node* parent = tnode;
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while (parent = cs->getParentNode(parent)) {
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if (pxi->pExpr->matches(tnode, parent, cs))
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tmpNodes.add(parent);
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}
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break;
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}
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case PARENT_OP:
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{
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Node* parent = cs->getParentNode(tnode);
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if (parent) {
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if (pxi->pExpr->matches(tnode, parent, cs))
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tmpNodes.add(parent);
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}
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break;
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}
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default:
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if ( !iter->hasNext() ) {
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result = pxi->pExpr->matches(tnode, context, cs);
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}
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else {
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//-- error in expression
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tmpNodes.clear();
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nodes.clear();
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delete iter;
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return MB_FALSE;
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}
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break;
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}
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} //-- for
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nodes.clear();
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tmpNodes.copyInto(nodes);
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tmpNodes.clear();
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}
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delete iter;
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if ( this->isAbsolute()) {
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Node* doc = node->getOwnerDocument();
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return (MBool) nodes.contains(doc);
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}
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return (MBool) (result || (nodes.size() > 0));
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} //-- matches
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/**
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* Returns the String representation of this PatternExpr.
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* @param dest the String to use when creating the String
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* representation. The String representation will be appended to
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* any data in the destination String, to allow cascading calls to
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* other #toString() methods for Expressions.
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* @return the String representation of this PatternExpr.
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**/
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void PathExpr::toString(String& dest) {
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ListIterator* iter = expressions.iterator();
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while ( iter->hasNext() ) {
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//-- set operator
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PathExprItem* pxi = (PathExprItem*)iter->next();
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switch ( pxi->ancestryOp ) {
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case ANCESTOR_OP:
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dest.append("//");
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break;
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case PARENT_OP:
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dest.append('/');
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break;
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default:
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break;
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}
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pxi->pExpr->toString(dest);
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}
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delete iter;
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} //-- toString
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