77 lines
2.2 KiB
C++
77 lines
2.2 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 Initial Developer of the Original Code is Jonas Sicking.
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* Portions created by Jonas Sicking are Copyright (C) 2001, Jonas Sicking.
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* All rights reserved.
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*
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* Contributor(s):
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* Jonas Sicking, sicking@bigfoot.com
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* -- original author.
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*
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* NaN/Infinity code copied from the JS-library with permission from
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* Netscape Communications Corporation: http://www.mozilla.org/js
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* http://lxr.mozilla.org/seamonkey/source/js/src/jsinterp.c
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*
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*/
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#include "Expr.h"
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UnaryExpr::UnaryExpr(Expr* expr)
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{
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this->expr = expr;
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}
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UnaryExpr::~UnaryExpr()
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{
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delete expr;
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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* UnaryExpr::evaluate(Node* context, ContextState* cs)
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{
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ExprResult* exprRes = expr->evaluate(context, cs);
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double value = exprRes->numberValue();
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delete exprRes;
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#ifdef HPUX
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/*
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* Negation of a zero doesn't produce a negative
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* zero on HPUX. Perform the operation by multiplying with
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* -1.
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*/
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return new NumberResult(-1 * value);
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#else
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return new NumberResult(-value);
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#endif
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}
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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 UnaryExpr::toString(String& str)
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{
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if (!expr)
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return;
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str.append('-');
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expr->toString(str);
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}
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