/***************************************************************************** * * * This file is part of the BeanShell Java Scripting distribution. * * Documentation and updates may be found at http://www.beanshell.org/ * * * * Sun Public License Notice: * * * * The contents of this file are subject to the Sun Public License Version * * 1.0 (the "License"); you may not use this file except in compliance with * * the License. A copy of the License is available at http://www.sun.com * * * * The Original Code is BeanShell. The Initial Developer of the Original * * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright * * (C) 2000. All Rights Reserved. * * * * GNU Public License Notice: * * * * Alternatively, the contents of this file may be used under the terms of * * the GNU Lesser General Public License (the "LGPL"), in which case the * * provisions of LGPL are applicable instead of those above. If you wish to * * allow use of your version of this file only under the terms of the LGPL * * and not to allow others to use your version of this file under the SPL, * * indicate your decision by deleting the provisions above and replace * * them with the notice and other provisions required by the LGPL. If you * * do not delete the provisions above, a recipient may use your version of * * this file under either the SPL or the LGPL. * * * * Patrick Niemeyer (pat@pat.net) * * Author of Learning Java, O'Reilly & Associates * * http://www.pat.net/~pat/ * * * *****************************************************************************/ package org.gjt.sp.jedit.bsh; /** This class handles both while(){} statements and do{}while() statements. */ class BSHWhileStatement extends SimpleNode implements ParserConstants { public boolean isDoStatement; BSHWhileStatement(int id) { super(id); } public Object eval( CallStack callstack, Interpreter interpreter) throws EvalError { int numChild = jjtGetNumChildren(); // Order of body and condition is swapped for do / while SimpleNode condExp, body = null; if ( isDoStatement ) { condExp = (SimpleNode)jjtGetChild(1); body =(SimpleNode)jjtGetChild(0); } else { condExp = (SimpleNode)jjtGetChild(0); if ( numChild > 1 ) // has body, else just for side effects body =(SimpleNode)jjtGetChild(1); } boolean doOnceFlag = isDoStatement; while( doOnceFlag || BSHIfStatement.evaluateCondition(condExp, callstack, interpreter ) ) { if ( body == null ) // no body? continue; Object ret = body.eval(callstack, interpreter); boolean breakout = false; if(ret instanceof ReturnControl) { switch(((ReturnControl)ret).kind ) { case RETURN: return ret; case CONTINUE: continue; case BREAK: breakout = true; break; } } if(breakout) break; doOnceFlag = false; } return Primitive.VOID; } }