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/*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), 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
* License and not to allow others to use your version of this file under
* the MPL, 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 MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*
* This class is based on a sample class by SUN.
* The original copyright notice is as follows:
*
* Copyright 1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*
* The license agreement can be found at this URL:
* http://java.sun.com/products/java-media/2D/samples/samples-license.html
* See also the file sun.txt in directory com.lowagie.text.pdf
*/
package com.lowagie.text.pdf.codec.postscript;
import java.util.*;
public class PAEngine extends Object {
static public final int MODE_STACK = 0;
static public final int MODE_PROCEDURE = 1;
static public final int MODE_ARRAY = 2;
protected PAContext context;
protected int mode;
protected Stack procedure;
protected int innerProcedures;
public PAEngine(PAContext context){
super();
this.context = context;
this.mode = PAEngine.MODE_STACK;
}
public void startProcedure() throws PainterException {
this.procedure = new Stack();
this.mode = PAEngine.MODE_PROCEDURE;
this.innerProcedures = 0;
}
public void endProcedure() throws PainterException {
this.context.operands.push(new PAToken(this.procedure, PAToken.PROCEDURE));
this.mode = PAEngine.MODE_STACK;
}
public void bindProcedure(PAToken patoken){
Stack oldStack = (Stack) patoken.value;
Stack newStack = new Stack();
int i,n;
n = oldStack.size();
for(i = 0; i < n; i++){
Object token = oldStack.elementAt(i);
if((token instanceof PAToken) && ((PAToken) token).type == PAToken.IDENTIFIER){
Object foundToken = this.context.findIdentifier(((PAToken) token).value);
if(foundToken == null){
newStack.push(token);
} else {
newStack.push(foundToken);
}
} else {
newStack.push(token);
}
}
patoken.value = newStack;
}
public void process(Object token) throws PainterException {
if(token == null){
throw new IllegalStateException("Null token encountered; last unknown identifier was " + this.context.getLastUnknownIdentifier()+" at line "+this.context.poorscript.token.beginLine);
}
if(PAContext.DebugExecution){
System.out.print("==>" + token.toString());
// System.out.flush();
}
if(token instanceof PAToken && ((PAToken) token).type == PAToken.IMMEDIATE){
Object foundValue = this.context.findIdentifier(((PAToken) token).value);
this.process(foundValue);
return;
}
if(this.mode == MODE_STACK){
if(token instanceof PACommand){
((PACommand) token).execute(this.context);
} else if(token instanceof PAToken){
PAToken patoken = (PAToken) token;
switch(patoken.type){
case PAToken.IDENTIFIER:
this.process(this.context.findIdentifier(patoken.value));
break;
case PAToken.KEY:
case PAToken.MARK:
case PAToken.START_ARRAY:
this.context.operands.push(token);
break;
case PAToken.PROCEDURE:
Enumeration enumx = ((Vector) patoken.value).elements();
while(enumx.hasMoreElements()){
this.process(enumx.nextElement());
}
break;
case PAToken.START_PROCEDURE:
this.startProcedure();
break;
case PAToken.END_ARRAY:
this.context.collectArray();
break;
case PAToken.START_DICT:
this.context.operands.push(token);
break;
case PAToken.END_DICT:
this.context.collectDict();
break;
default:
throw new IllegalStateException("Unknown token encountered" + token);
}
} else {
this.context.operands.push(token);
}
} else if(this.mode == MODE_PROCEDURE){
if(token instanceof PAToken){
PAToken patoken = (PAToken) token;
switch(patoken.type){
case PAToken.START_PROCEDURE:
this.innerProcedures++;
this.procedure.push(token);
break;
case PAToken.END_PROCEDURE:
if(this.innerProcedures > 0){
this.innerProcedures--;
this.procedure.push(token);
} else {
this.endProcedure();
}
break;
default:
this.procedure.push(token);
}
} else {
this.procedure.push(token);
}
}
}
public String litMode(){
switch(this.mode){
case MODE_ARRAY: return "Array";
case MODE_PROCEDURE: return "Proc"+innerProcedures;
case MODE_STACK: return "Stack";
default: return "Unknown";
}
}
}
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