samples/bsh/src/dolda/bsvc/ShellPage.java

   1 package dolda.bsvc;
   2
   3 import dolda.jsvc.*;
   4 import dolda.jsvc.util.*;
   5 import java.io.*;
   6 import bsh.Interpreter;
   7
   8 public class ShellPage extends SimpleWriter {
   9     private RConsole cons = new RConsole();
  10     private Interpreter ip = new Interpreter(cons);
  11
  12     private static class RConsole implements bsh.ConsoleInterface {
  13         public Console back;
  14         Reader in = new StringReader("");
  15
  16         public void error(Object msg) {
  17             if(back != null)
  18                 back.error(msg);
  19         }
  20
  21         public void print(Object msg) {
  22             if(back != null)
  23                 back.print(msg);
  24         }
  25
  26         public void println(Object msg) {
  27             if(back != null)
  28                 back.println(msg);
  29         }
  30
  31         public PrintStream getOut() {
  32             if(back == null)
  33                 return(null);
  34             return(back.getOut());
  35         }
  36
  37         public PrintStream getErr() {
  38             if(back == null)
  39                 return(null);
  40             return(back.getErr());
  41         }
  42
  43         public Reader getIn() {
  44             if(back == null)
  45                 return(null);
  46             return(in);
  47         }
  48     }
  49
  50     private static class Console implements bsh.ConsoleInterface {
  51         ByteArrayOutputStream obuf = new ByteArrayOutputStream();
  52         ByteArrayOutputStream ebuf = new ByteArrayOutputStream();
  53         Reader in = new StringReader("");
  54         PrintStream out;
  55         PrintStream err;
  56         {
  57             try {
  58                 out = new PrintStream(obuf, false, "UTF-8");
  59                 err = new PrintStream(ebuf, false, "UTF-8");
  60             } catch(UnsupportedEncodingException e) {
  61                 throw(new Error(e));
  62             }
  63         }
  64
  65         public void error(Object msg) {
  66             getErr().println(msg);
  67         }
  68
  69         public void print(Object o) {
  70             getOut().print(o);
  71         }
  72
  73         public void println(Object o) {
  74             getOut().println(o);
  75         }
  76
  77         public PrintStream getOut() {
  78             return(out);
  79         }
  80
  81         public PrintStream getErr() {
  82             return(err);
  83         }
  84
  85         public Reader getIn() {
  86             return(in);
  87         }
  88     }
  89
  90     public void respond(Request req, PrintWriter out) {
  91         MultiMap<String, String> params = req.params();
  92         String cmd = params.get("cmd");
  93
  94         out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
  95         out.println("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">");
  96         out.println("<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en-US\">");
  97         out.println("<head>");
  98         out.println("<title>Shell</title>");
  99         out.println("<link rel=\"stylesheet\" type=\"text/css\" href=\"css\" />");
 100         out.println("</head>");
 101         out.println("<body>");
 102         out.println("<h1>Shell</h1>");
 103         if((req.method() == "POST") && (cmd != null)) {
 104             Console cons = new Console();
 105             synchronized(ip) {
 106                 this.cons.back = cons;
 107                 try {
 108                     Object resp;
 109                     try {
 110                         ip.set("req", req);
 111                         resp = ip.eval(cmd);
 112                         out.println("<pre>");
 113                         out.println(Misc.htmlq((resp == null)?"(null)":(resp.toString())));
 114                         out.println("</pre>");
 115                     } catch(bsh.EvalError exc) {
 116                         out.println("<h2>Evaluation error</h2>");
 117                         out.println("<pre>");
 118                         out.print(exc.toString());
 119                         out.println("</pre>");
 120                         if(exc instanceof bsh.TargetError) {
 121                             bsh.TargetError te = (bsh.TargetError)exc;
 122                             out.println("<h3>Target error</h3>");
 123                             out.println("<pre>");
 124                             te.getTarget().printStackTrace(out);
 125                             out.println("</pre>");
 126                         }
 127                     }
 128                 } finally {
 129                     this.cons.back = null;
 130                 }
 131             }
 132             String eo = new String(cons.obuf.toByteArray(), Misc.utf8);
 133             String ee = new String(cons.ebuf.toByteArray(), Misc.utf8);
 134             cons = null;
 135             if(eo.length() > 0) {
 136                 out.println("<h2>Output</h2>");
 137                 out.println("<pre>");
 138                 out.println(Misc.htmlq(eo));
 139                 out.println("</pre>");
 140             }
 141             if(ee.length() > 0) {
 142                 out.println("<h2>Errors</h2>");
 143                 out.println("<pre>");
 144                 out.println(Misc.htmlq(ee));
 145                 out.println("</pre>");
 146             }
 147         }
 148         out.println("<form action=\"sh\" method=\"post\">");
 149         out.println("<textarea cols=\"80\" rows=\"5\" name=\"cmd\">");
 150         if(cmd != null)
 151             out.print(cmd);
 152         out.println("</textarea>");
 153         out.println("<input type=\"submit\" value=\"Evaluate\" />");
 154         out.println("<input type=\"reset\" value=\"Reset\" />");
 155         out.println("</form>");
 156         out.println("</body>");
 157         out.println("</html>");
 158     }
 159 }