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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.struts2.jasper.compiler;
19  
20  import org.apache.struts2.jasper.JasperException;
21  import org.xml.sax.Attributes;
22  
23  class Dumper {
24  
25      static class DumpVisitor extends Node.Visitor {
26          private int indent = 0;
27  
28          private String getAttributes(Attributes attrs) {
29              if (attrs == null)
30                  return "";
31  
32              StringBuffer buf = new StringBuffer();
33              for (int i = 0; i < attrs.getLength(); i++) {
34                  buf.append(" " + attrs.getQName(i) + "=\""
35                          + attrs.getValue(i) + "\"");
36              }
37              return buf.toString();
38          }
39  
40          private void printString(String str) {
41              printIndent();
42              System.out.print(str);
43          }
44  
45          private void printString(String prefix, char[] chars, String suffix) {
46              String str = null;
47              if (chars != null) {
48                  str = new String(chars);
49              }
50              printString(prefix, str, suffix);
51          }
52  
53          private void printString(String prefix, String str, String suffix) {
54              printIndent();
55              if (str != null) {
56                  System.out.print(prefix + str + suffix);
57              } else {
58                  System.out.print(prefix + suffix);
59              }
60          }
61  
62          private void printAttributes(String prefix, Attributes attrs,
63                                       String suffix) {
64              printString(prefix, getAttributes(attrs), suffix);
65          }
66  
67          private void dumpBody(Node n) throws JasperException {
68              Node.Nodes page = n.getBody();
69              if (page != null) {
70  //		indent++;
71                  page.visit(this);
72  //		indent--;
73              }
74          }
75  
76          public void visit(Node.PageDirective n) throws JasperException {
77              printAttributes("<%@ page", n.getAttributes(), "%>");
78          }
79  
80          public void visit(Node.TaglibDirective n) throws JasperException {
81              printAttributes("<%@ taglib", n.getAttributes(), "%>");
82          }
83  
84          public void visit(Node.IncludeDirective n) throws JasperException {
85              printAttributes("<%@ include", n.getAttributes(), "%>");
86              dumpBody(n);
87          }
88  
89          public void visit(Node.Comment n) throws JasperException {
90              printString("<%--", n.getText(), "--%>");
91          }
92  
93          public void visit(Node.Declaration n) throws JasperException {
94              printString("<%!", n.getText(), "%>");
95          }
96  
97          public void visit(Node.Expression n) throws JasperException {
98              printString("<%=", n.getText(), "%>");
99          }
100 
101         public void visit(Node.Scriptlet n) throws JasperException {
102             printString("<%", n.getText(), "%>");
103         }
104 
105         public void visit(Node.IncludeAction n) throws JasperException {
106             printAttributes("<jsp:include", n.getAttributes(), ">");
107             dumpBody(n);
108             printString("</jsp:include>");
109         }
110 
111         public void visit(Node.ForwardAction n) throws JasperException {
112             printAttributes("<jsp:forward", n.getAttributes(), ">");
113             dumpBody(n);
114             printString("</jsp:forward>");
115         }
116 
117         public void visit(Node.GetProperty n) throws JasperException {
118             printAttributes("<jsp:getProperty", n.getAttributes(), "/>");
119         }
120 
121         public void visit(Node.SetProperty n) throws JasperException {
122             printAttributes("<jsp:setProperty", n.getAttributes(), ">");
123             dumpBody(n);
124             printString("</jsp:setProperty>");
125         }
126 
127         public void visit(Node.UseBean n) throws JasperException {
128             printAttributes("<jsp:useBean", n.getAttributes(), ">");
129             dumpBody(n);
130             printString("</jsp:useBean>");
131         }
132 
133         public void visit(Node.PlugIn n) throws JasperException {
134             printAttributes("<jsp:plugin", n.getAttributes(), ">");
135             dumpBody(n);
136             printString("</jsp:plugin>");
137         }
138 
139         public void visit(Node.ParamsAction n) throws JasperException {
140             printAttributes("<jsp:params", n.getAttributes(), ">");
141             dumpBody(n);
142             printString("</jsp:params>");
143         }
144 
145         public void visit(Node.ParamAction n) throws JasperException {
146             printAttributes("<jsp:param", n.getAttributes(), ">");
147             dumpBody(n);
148             printString("</jsp:param>");
149         }
150 
151         public void visit(Node.NamedAttribute n) throws JasperException {
152             printAttributes("<jsp:attribute", n.getAttributes(), ">");
153             dumpBody(n);
154             printString("</jsp:attribute>");
155         }
156 
157         public void visit(Node.JspBody n) throws JasperException {
158             printAttributes("<jsp:body", n.getAttributes(), ">");
159             dumpBody(n);
160             printString("</jsp:body>");
161         }
162 
163         public void visit(Node.ELExpression n) throws JasperException {
164             printString("${" + new String(n.getText()) + "}");
165         }
166 
167         public void visit(Node.CustomTag n) throws JasperException {
168             printAttributes("<" + n.getQName(), n.getAttributes(), ">");
169             dumpBody(n);
170             printString("</" + n.getQName() + ">");
171         }
172 
173         public void visit(Node.UninterpretedTag n) throws JasperException {
174             String tag = n.getQName();
175             printAttributes("<" + tag, n.getAttributes(), ">");
176             dumpBody(n);
177             printString("</" + tag + ">");
178         }
179 
180         public void visit(Node.TemplateText n) throws JasperException {
181             printString(new String(n.getText()));
182         }
183 
184         private void printIndent() {
185             for (int i = 0; i < indent; i++) {
186                 System.out.print("  ");
187             }
188         }
189     }
190 
191     public static void dump(Node n) {
192         try {
193             n.accept(new DumpVisitor());
194         } catch (JasperException e) {
195             e.printStackTrace();
196         }
197     }
198 
199     public static void dump(Node.Nodes page) {
200         try {
201             page.visit(new DumpVisitor());
202         } catch (JasperException e) {
203             e.printStackTrace();
204         }
205     }
206 }
207