148 lines
4.3 KiB
C++
148 lines
4.3 KiB
C++
/*
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* (C) Copyright The MITRE Corporation 1999 All rights reserved.
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* The program provided "as is" without any warranty express or
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* implied, including the warranty of non-infringement and the implied
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* warranties of merchantibility and fitness for a particular purpose.
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* The Copyright owner will not be liable for any damages suffered by
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* you as a result of using the Program. In no event will the Copyright
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* owner be liable for any special, indirect or consequential damages or
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* lost profits even if the Copyright owner has been advised of the
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* possibility of their occurrence.
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*
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* Please see release.txt distributed with this file for more information.
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*
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*/
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#include "Expr.h"
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/**
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* This class represents a ElementExpr as defined by the XSL
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* Working Draft
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* <PRE>
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* </PRE>
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* @author <a href="mailto:kvisco@mitre.org">Keith Visco</a>
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* This file was ported from XSL:P
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**/
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//- Constructors -/
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AttributeExpr::AttributeExpr() {
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this->isWild = MB_FALSE;
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} //-- AttributeExpr
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AttributeExpr::AttributeExpr(String& name) {
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//-- copy name
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this->name = name;
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this->isWild = MB_FALSE;
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} //-- AttributeExpr
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/**
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* Destructor
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**/
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AttributeExpr::~AttributeExpr() {
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} //-- ~AttributeExpr
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//------------------/
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//- Public Methods -/
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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* AttributeExpr::evaluate(Node* context, ContextState* cs) {
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NodeSet* nodeSet = new NodeSet();
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if ( !context ) return nodeSet;
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NamedNodeMap* atts = context->getAttributes();
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if ( atts ) {
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for (int i = 0; i < atts->getLength(); i++ ) {
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Attr* attr = (Attr*)atts->item(i);
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if ( isWild ) nodeSet->add(attr);
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else {
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String attName = attr->getName();
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if ( name.isEqual(attName) ){
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nodeSet->add(attr);
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}
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}
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}
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}
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return nodeSet;
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} //-- evaluate
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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 AttributeExpr::getDefaultPriority(Node* node, Node* context, ContextState* cs) {
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return 0.0;
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} //-- getDefaultPriority
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/**
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* Returns the name of this ElementExpr
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* @return the name of this ElementExpr
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**/
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const String& AttributeExpr::getName() {
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return (const String&) this->name;
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} //-- getName
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void AttributeExpr::setName(const String& name) {
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this->name.clear();
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this->name.append(name);
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} //-- setName
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void AttributeExpr::setWild(MBool isWild) {
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this->isWild = isWild;
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} //-- setWild
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//-----------------------------/
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//- Methods from NodeExpr.cpp -/
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//-----------------------------/
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/**
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* Returns the type of this NodeExpr
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* @return the type of this NodeExpr
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**/
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short AttributeExpr::getType() {
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return NodeExpr::ATTRIBUTE_EXPR;
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} //-- getType
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/**
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* Determines whether this NodeExpr matches the given node within
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* the given context
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**/
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MBool AttributeExpr::matches(Node* node, Node* context, ContextState* cs) {
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if ( (node) && (node->getNodeType() == Node::ATTRIBUTE_NODE) ) {
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if ( isWild ) return MB_TRUE;
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const String nodeName = ((Attr*)node)->getName();
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return nodeName.isEqual(this->name);
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}
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return MB_FALSE;
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} //-- matches
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/**
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* Returns the String representation of this NodeExpr.
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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 NodeExpr.
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**/
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void AttributeExpr::toString(String& dest) {
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dest.append('@');
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if (isWild) dest.append('*');
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else dest.append(this->name);
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} //-- toString
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