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113 lines
3.2 KiB
C++
113 lines
3.2 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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*
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* Marc Schefer, schefer@xo3.com
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* -- fixed a bug regarding Or expressions
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* - If the left hand was false, the right hand expression
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* was not getting checked.
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*
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*/
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/**
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* Represents a BooleanExpr, a binary expression that
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* performs a boolean operation between it's lvalue and rvalue.
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**/
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#include "Expr.h"
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/**
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* Creates a new BooleanExpr using the given operator
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**/
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BooleanExpr::BooleanExpr(Expr* leftExpr, Expr* rightExpr, short op) {
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this->op = op;
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this->leftExpr = leftExpr;
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this->rightExpr = rightExpr;
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} //-- BooleanExpr
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BooleanExpr::~BooleanExpr() {
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delete leftExpr;
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delete rightExpr;
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} //-- ~BooleanExpr
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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* BooleanExpr::evaluate(Node* context, ContextState* cs) {
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MBool lval = MB_FALSE;
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ExprResult* exprRes = 0;
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if ( leftExpr ) {
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exprRes = leftExpr->evaluate(context, cs);
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if ( exprRes ) lval = exprRes->booleanValue();
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delete exprRes;
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}
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//-- check left expression for early decision
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if (( op == OR ) && (lval)) return new BooleanResult(MB_TRUE);
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else if ((op == AND) && (!lval)) return new BooleanResult(MB_FALSE);
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MBool rval = MB_FALSE;
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if ( rightExpr ) {
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exprRes = rightExpr->evaluate(context, cs);
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if ( exprRes ) rval = exprRes->booleanValue();
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delete exprRes;
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}
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//-- just use rval, since we already checked lval
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return new BooleanResult(rval);
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} //-- evaluate
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/**
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* Returns the String representation of this Expr.
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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 Expr.
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**/
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void BooleanExpr::toString(String& str) {
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if ( leftExpr ) leftExpr->toString(str);
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else str.append("null");
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switch ( op ) {
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case OR:
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str.append(" or ");
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break;
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default:
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str.append(" and ");
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break;
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}
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if ( rightExpr ) rightExpr->toString(str);
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else str.append("null");
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} //-- toString
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