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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jasper.compiler;

import org.xml.sax.Attributes;
import org.apache.jasper.JasperException;

class Dumper {

    static class DumpVisitor extends Node.Visitor {
	private int indent = 0;

	private String getAttributes(Attributes attrs) {
	    if (attrs == null)
		return "";

	    StringBuilder buf = new StringBuilder();
	    for (int i=0; i < attrs.getLength(); i++) {
		buf.append(" " + attrs.getQName(i) + "=\""
			   + attrs.getValue(i) + "\"");
	    }
	    return buf.toString();
	}

	private void printString(String str) {
	    printIndent();
	    System.out.print(str);
	}

	private void printString(String prefix, char[] chars, String suffix) {
	    String str = null;
	    if (chars != null) {
		str = new String(chars);
	    }
	    printString(prefix, str, suffix);
	}
	     
	private void printString(String prefix, String str, String suffix) {
	    printIndent();
	    if (str != null) {
		System.out.print(prefix + str + suffix);
	    } else {
		System.out.print(prefix + suffix);
	    }
	}

	private void printAttributes(String prefix, Attributes attrs,
				     String suffix) {
	    printString(prefix, getAttributes(attrs), suffix);
	}

	private void dumpBody(Node n) throws JasperException {
	    Node.Nodes page = n.getBody();
	    if (page != null) {
//		indent++;
		page.visit(this);
//		indent--;
	    }
        }

        public void visit(Node.PageDirective n) throws JasperException {
	    printAttributes("<%@ page", n.getAttributes(), "%>");
        }

        public void visit(Node.TaglibDirective n) throws JasperException {
	    printAttributes("<%@ taglib", n.getAttributes(), "%>");
        }

        public void visit(Node.IncludeDirective n) throws JasperException {
	    printAttributes("<%@ include", n.getAttributes(), "%>");
	    dumpBody(n);
        }

        public void visit(Node.Comment n) throws JasperException {
	    printString("<%--", n.getText(), "--%>");
        }

        public void visit(Node.Declaration n) throws JasperException {
	    printString("<%!", n.getText(), "%>");
        }

        public void visit(Node.Expression n) throws JasperException {
	    printString("<%=", n.getText(), "%>");
        }

        public void visit(Node.Scriptlet n) throws JasperException {
	    printString("<%", n.getText(), "%>");
        }

        public void visit(Node.IncludeAction n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
            printString("");
        }

        public void visit(Node.ForwardAction n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
        }

        public void visit(Node.GetProperty n) throws JasperException {
	    printAttributes("");
        }

        public void visit(Node.SetProperty n) throws JasperException {
	    printAttributes("");
            dumpBody(n);
            printString("");
        }

        public void visit(Node.UseBean n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
        }
	
        public void visit(Node.PlugIn n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
	}
        
        public void visit(Node.ParamsAction n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
        }
        
        public void visit(Node.ParamAction n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
        }
        
        public void visit(Node.NamedAttribute n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
        }

        public void visit(Node.JspBody n) throws JasperException {
	    printAttributes("");
	    dumpBody(n);
	    printString("");
        }
        
        public void visit(Node.ELExpression n) throws JasperException {
	    printString( n.getText());
        }

        public void visit(Node.CustomTag n) throws JasperException {
	    printAttributes("<" + n.getQName(), n.getAttributes(), ">");
	    dumpBody(n);
	    printString("");
        }

	public void visit(Node.UninterpretedTag n) throws JasperException {
	    String tag = n.getQName();
	    printAttributes("<"+tag, n.getAttributes(), ">");
	    dumpBody(n);
	    printString("");
        }

	public void visit(Node.TemplateText n) throws JasperException {
	    printString(n.getText());
	}

	private void printIndent() {
	    for (int i=0; i < indent; i++) {
		System.out.print("  ");
	    }
	}
    }

    public static void dump(Node n) {
	try {
	    n.accept(new DumpVisitor());	
	} catch (JasperException e) {
	    e.printStackTrace();
	}
    }

    public static void dump(Node.Nodes page) {
	try {
	    page.visit(new DumpVisitor());
	} catch (JasperException e) {
	    e.printStackTrace();
	}
    }
}