Dispatcher.java

// Copyright 2001, FreeHEP.
package org.freehep.postscript;

import java.io.IOException;

/**
 * Objects for PostScript Processor, as defined in 3.3 Data Types and Objects
 *
 * @author Mark Donszelmann
 * @version $Id: Dispatcher.java 8958 2006-09-12 23:37:43Z duns $
 */
public class Dispatcher {

    private Dispatcher() {
    }
    
    public static boolean dispatch(OperandStack os, PSTokenizable in) {
        try {            
            PSObject obj = in.token(os.packingMode(), os.dictStack());
            if (obj == null) {
                return true;
            }
                        
            // handle token, especially for procedures built by scanner
            if (obj instanceof PSPackedArray) {
                os.push(obj);
            } else {
                os.execStack().push(obj);
            }
            return false;
        } catch (IOException e) {
            PSObject.error(os, new IOError());
            return true;
        } catch (SyntaxException e) {
            PSArray errorInfo = new PSArray(2);
            errorInfo.set(0, new PSInteger(e.getLineNo()));
            errorInfo.set(1, new PSString(e.getMessage()));
            os.dictStack().dollarError().put("errorinfo", errorInfo);
            PSObject.error(os, new SyntaxError());
            return true;
        } catch (NameNotFoundException e) {
            PSObject.error(os, new Undefined());
            return true;
        }            
    }
    
}