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Erubis Users' Guide

4 Multi-Language Support

Erubis supports the following languages^(*2):

Ruby
PHP
C
Java
Scheme
Perl
JavaScript

(*2): If you need template engine in pure PHP/Perl/JavaScript, try Tenjin (http://www.kuwata-lab.com/tenjin/). Tenjin is a very fast and full-featured template engine implemented in pure PHP/Perl/JavaScript.

4-1 PHP

example.ephp

<?xml version="1.0"?>
<html>
 <body>
  <p>Hello <%= $user %>!</p>
  <table>
   <tbody>
    <% $i = 0; %>
    <% foreach ($list as $item) { %>
    <%   $i++; %>
    <tr bgcolor="<%= $i % 2 == 0 ? '#FFCCCC' : '#CCCCFF' %>">
     <td><%= $i %></td>
     <td><%== $item %></td>
    </tr>
    <% } %>
   </tbody>
  </table>
 </body>
</html>

compiled source code

$ erubis -l php example.ephp
<<?php ?>?xml version="1.0"?>
<html>
 <body>
  <p>Hello <?php echo $user; ?>!</p>
  <table>
   <tbody>
<?php     $i = 0; ?>
<?php     foreach ($list as $item) { ?>
<?php       $i++; ?>
    <tr bgcolor="<?php echo $i % 2 == 0 ? '#FFCCCC' : '#CCCCFF'; ?>">
     <td><?php echo $i; ?></td>
     <td><?php echo htmlspecialchars($item); ?></td>
    </tr>
<?php     } ?>
   </tbody>
  </table>
 </body>
</html>

4-2 C

example.ec

<%
#include <stdio.h>

int main(int argc, char *argv[])
{
    int i;

%>
<html>
 <body>
  <p>Hello <%= "%s", argv[0] %>!</p>
  <table>
   <tbody>
    <% for (i = 1; i < argc; i++) { %>
    <tr bgcolor="<%= i % 2 == 0 ? "#FFCCCC" : "#CCCCFF" %>">
      <td><%= "%d", i %></td>
      <td><%= "%s", argv[i] %></td>
    </tr>
    <% } %>
   </tbody>
  </table>
 </body>
</html>
<%
    return 0; 
}
%>

compiled source code

$ erubis -l c example.ec
#line 1 "example.ec"

#include <stdio.h>

int main(int argc, char *argv[])
{
    int i;


fputs("<html>\n"
      " <body>\n"
      "  <p>Hello ", stdout); fprintf(stdout, "%s", argv[0]); fputs("!</p>\n"
      "  <table>\n"
      "   <tbody>\n", stdout);
     for (i = 1; i < argc; i++) { 
fputs("    <tr bgcolor=\"", stdout); fprintf(stdout, i % 2 == 0 ? "#FFCCCC" : "#CCCCFF"); fputs("\">\n"
      "      <td>", stdout); fprintf(stdout, "%d", i); fputs("</td>\n"
      "      <td>", stdout); fprintf(stdout, "%s", argv[i]); fputs("</td>\n"
      "    </tr>\n", stdout);
     } 
fputs("   </tbody>\n"
      "  </table>\n"
      " </body>\n"
      "</html>\n", stdout);

    return 0; 
}

4-3 Java

Example.ejava

<%
import java.util.*;

public class Example {
  private String user;
  private String[] list;
  public example(String user, String[] list) {
    this.user = user;
    this.list = list;
  }

  public String view() {
    StringBuffer _buf = new StringBuffer();
%>
<html>
 <body>
  <p>Hello <%= user %>!</p>
  <table>
   <tbody>
    <% for (int i = 0; i < list.length; i++) { %>
    <tr bgcolor="<%= i % 2 == 0 ? "#FFCCCC" : "#CCCCFF" %>">
     <td><%= i + 1 %></td>
     <td><%== list[i] %></td>
    </tr>
    <% } %>
   </tbody>
  </table>
 <body>
</html>
<%
    return _buf.toString();
  }

  public static void main(String[] args) {
    String[] list = { "<aaa>", "b&b", "\"ccc\"" };
    Example ex = Example.new("Erubis", list);
    System.out.print(ex.view());
  }

  public static String escape(String s) {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < s.length(); i++) {
      char ch = s.charAt(i);
      switch (ch) {
      case '<':   sb.append("&lt;"); break;
      case '>':   sb.append("&gt;"); break;
      case '&':   sb.append("&amp;"); break;
      case '"':   sb.append("&quot;"); break;
      default:    sb.append(ch);
      }
    }
    return sb.toString();
  }
}
%>

compiled source code

$ erubis -b -l java example.ejava

import java.util.*;

public class Example {
  private String user;
  private String[] list;
  public example(String user, String[] list) {
    this.user = user;
    this.list = list;
  }

  public String view() {
    StringBuffer _buf = new StringBuffer();

_buf.append("<html>\n"
          + " <body>\n"
          + "  <p>Hello "); _buf.append(user); _buf.append("!</p>\n"
          + "  <table>\n"
          + "   <tbody>\n");
     for (int i = 0; i < list.length; i++) { 
_buf.append("    <tr bgcolor=\""); _buf.append(i % 2 == 0 ? "#FFCCCC" : "#CCCCFF"); _buf.append("\">\n"
          + "     <td>"); _buf.append(i + 1); _buf.append("</td>\n"
          + "     <td>"); _buf.append(escape(list[i])); _buf.append("</td>\n"
          + "    </tr>\n");
     } 
_buf.append("   </tbody>\n"
          + "  </table>\n"
          + " <body>\n"
          + "</html>\n");

    return _buf.toString();
  }

  public static void main(String[] args) {
    String[] list = { "<aaa>", "b&b", "\"ccc\"" };
    Example ex = Example.new("Erubis", list);
    System.out.print(ex.view());
  }

  public static String escape(String s) {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < s.length(); i++) {
      char ch = s.charAt(i);
      switch (ch) {
      case '<':   sb.append("&lt;"); break;
      case '>':   sb.append("&gt;"); break;
      case '&':   sb.append("&amp;"); break;
      case '"':   sb.append("&quot;"); break;
      default:    sb.append(ch);
      }
    }
    return sb.toString();
  }
}

4-4 Scheme

example.escheme

<html>
 <body>
<%
(let ((user "Erubis")
      (items '("<aaa>" "b&b" "\"ccc\""))
      (i 0))
 %>
  <p>Hello <%= user %>!</p>
  <table>
<%
  (for-each
   (lambda (item)
     (set! i (+ i 1))
 %>
   <tr bgcolor="<%= (if (= (modulo i 2) 0) "#FFCCCC" "#CCCCFF") %>">
    <td><%= i %></td>
    <td><%= item %></td>
   </tr>
<%
   ) ; lambda end
   items) ; for-each end
 %>
  </table>
<%
) ; let end
%>
 </body>
</html>

compiled source code

$ erubis -l scheme example.escheme
(let ((_buf '())) (define (_add x) (set! _buf (cons x _buf))) (_add "<html>
 <body>\n")

(let ((user "Erubis")
      (items '("<aaa>" "b&b" "\"ccc\""))
      (i 0))
 
(_add "  <p>Hello ")(_add user)(_add "!</p>
  <table>\n")

  (for-each
   (lambda (item)
     (set! i (+ i 1))
 
(_add "   <tr bgcolor=\"")(_add (if (= (modulo i 2) 0) "#FFCCCC" "#CCCCFF"))(_add "\">
    <td>")(_add i)(_add "</td>
    <td>")(_add item)(_add "</td>
   </tr>\n")

   ) ; lambda end
   items) ; for-each end
 
(_add "  </table>\n")

) ; let end

(_add " </body>
</html>\n")
  (reverse _buf))

compiled source code (with --func=display property)

$ erubis -l scheme --func=display example.escheme
(display "<html>
 <body>\n")

(let ((user "Erubis")
      (items '("<aaa>" "b&b" "\"ccc\""))
      (i 0))
 
(display "  <p>Hello ")(display user)(display "!</p>
  <table>\n")

  (for-each
   (lambda (item)
     (set! i (+ i 1))
 
(display "   <tr bgcolor=\"")(display (if (= (modulo i 2) 0) "#FFCCCC" "#CCCCFF"))(display "\">
    <td>")(display i)(display "</td>
    <td>")(display item)(display "</td>
   </tr>\n")

   ) ; lambda end
   items) ; for-each end
 
(display "  </table>\n")

) ; let end

(display " </body>
</html>\n")

4-5 Perl

example.eprl

<%
   my $user = 'Erubis';
   my @list = ('<aaa>', 'b&b', '"ccc"');
%>
<html>
 <body>
  <p>Hello <%= $user %>!</p>
  <table>
   <% $i = 0; %>
   <% for $item (@list) { %>
   <tr bgcolor=<%= ++$i % 2 == 0 ? '#FFCCCC' : '#CCCCFF' %>">
    <td><%= $i %></td>
    <td><%= $item %></td>
   </tr>
   <% } %>
  </table>
 </body>
</html>

compiled source code

$ erubis -l perl example.eperl
use HTML::Entities; 
   my $user = 'Erubis';
   my @list = ('<aaa>', 'b&b', '"ccc"');

print('<html>
 <body>
  <p>Hello '); print($user); print('!</p>
  <table>
');     $i = 0; 
    for $item (@list) { 
print('   <tr bgcolor='); print(++$i % 2 == 0 ? '#FFCCCC' : '#CCCCFF'); print('">
    <td>'); print($i); print('</td>
    <td>'); print($item); print('</td>
   </tr>
');     } 
print('  </table>
 </body>
</html>
');

4-6 JavaScript

example.ejs

<%
   var user = 'Erubis';
   var list = ['<aaa>', 'b&b', '"ccc"'];
 %>
<html>
 <body>
  <p>Hello <%= user %>!</p>
  <table>
   <tbody>
    <% var i; %>
    <% for (i = 0; i < list.length; i++) { %>
    <tr bgcolor="<%= i % 2 == 0 ? '#FFCCCC' : '#CCCCFF' %>">
     <td><%= i + 1 %></td>
     <td><%= list[i] %></td>
    </tr>
    <% } %>
   </tbody>
  </table>
 </body>
</html>

compiled source code

$ erubis -l js example.ejs
var _buf = [];
   var user = 'Erubis';
   var list = ['<aaa>', 'b&b', '"ccc"'];
 
_buf.push("<html>\n\
 <body>\n\
  <p>Hello "); _buf.push(user); _buf.push("!</p>\n\
  <table>\n\
   <tbody>\n");
     var i; 
     for (i = 0; i < list.length; i++) { 
_buf.push("    <tr bgcolor=\""); _buf.push(i % 2 == 0 ? '#FFCCCC' : '#CCCCFF'); _buf.push("\">\n\
     <td>"); _buf.push(i + 1); _buf.push("</td>\n\
     <td>"); _buf.push(list[i]); _buf.push("</td>\n\
    </tr>\n");
     } 
_buf.push("   </tbody>\n\
  </table>\n\
 </body>\n\
</html>\n");
document.write(_buf.join(""));

If command-line option '--docwrite=false' is specified, '_buf.join("");' is used instead of 'document.write(_buf.join(""));'. This is useful when passing converted source code to eval() function in JavaScript.

You can pass :docwrite=>false to Erubis::Ejavascript.new() in your Ruby script.

s = File.read('example.jshtml')
engine = Erubis::Ejavascript.new(s, :docwrite=>false)

If you want to specify any JavaScript code, use '--postamble=...'.

Notice that default value of 'docwrite' property will be false in the future release.

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