pjs/extensions/transformiix/source/xpath/RootExpr.cpp

83 строки
2.7 KiB
C++

/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is TransforMiiX XSLT processor.
*
* The Initial Developer of the Original Code is The MITRE Corporation.
* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
*
* Portions created by Keith Visco as a Non MITRE employee,
* (C) 1999 Keith Visco. All Rights Reserved.
*
* Contributor(s):
* Keith Visco, kvisco@ziplink.net
* -- original author.
*
* $Id: RootExpr.cpp,v 1.1 2000-04-06 07:45:39 kvisco%ziplink.net Exp $
*/
#include "Expr.h"
MBool RootExpr::isAbsolute() {
return MB_TRUE;
} //-- isAbsolute
/**
* Evaluates this Expr based on the given context node and processor state
* @param context the context node for evaluation of this Expr
* @param ps the ContextState containing the stack information needed
* for evaluation
* @return the result of the evaluation
**/
ExprResult* RootExpr::evaluate(Node* context, ContextState* cs) {
NodeSet* nodeSet = new NodeSet();
if ( !context ) return nodeSet;
nodeSet->add(context->getOwnerDocument());
return nodeSet;
} //-- evaluate
/**
* Returns the default priority of this Pattern based on the given Node,
* context Node, and ContextState.
* If this pattern does not match the given Node under the current context Node and
* ContextState then Negative Infinity is returned.
**/
double RootExpr::getDefaultPriority(Node* node, Node* context, ContextState* cs) {
if ( matches(node, context, cs) ) {
return 0.5;
}
else return Double::NEGATIVE_INFINITY;
} //-- getDefaultPriority
/**
* Determines whether this NodeExpr matches the given node within
* the given context
**/
MBool RootExpr::matches(Node* node, Node* context, ContextState* cs) {
if ( node ) {
return (MBool) (node->getNodeType() == Node::DOCUMENT_NODE);
}
return MB_FALSE;
} //-- matches
/**
* Returns the String representation of this PatternExpr.
* @param dest the String to use when creating the String
* representation. The String representation will be appended to
* any data in the destination String, to allow cascading calls to
* other #toString() methods for Expressions.
* @return the String representation of this PatternExpr.
**/
void RootExpr::toString(String& dest) {
dest.append('/');
} //-- toString