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Common Problems
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The most common problems of all involve Escaping and Unescaping. They are so common, that an entire section on Escaping & Unescaping is devoted to them.

When I use a module inside a Embperl page, it behaves weired when the source changes.top

Nothing weird here. Everything is well defined. Just let us try to understand how Perl, mod_perl and Embperl works together:

  "perldoc -f use" tells us:

  Imports some semantics into the current package from the named module,
  generally by aliasing certain subroutine or variable names into your
  package.  It is exactly equivalent to
     BEGIN { require Module; import Module LIST; }

  except that Module must be a bareword.

So what's important here for us is, that use executes a require and this is always done before any other code is executed.

  "perldoc -f require" says (among other things):

  ..., demands that a library file be included if it hasn't already
  been included. 


  Note that the file will not be included twice under the same specified

So now we know (or should know) that mod_perl starts the Perl interpreter once when Apache is started and the Perl interpreter is only terminated when Apache is terminated. Out of these two things follows, that a module that is loaded via use or require is only loaded once and will never be reloaded, regardless if the source changes or not.

So far this is just standard Perl. Things get's a little bit more difficult when running under mod_perl (only Unix), because Apache forks a set of child processes as neccessary and from the moment they are forked, they run on their own and don't know of each other. So if a module is loaded at server startup time (before the fork), it is loaded in all childs (this can be used to save memory, because the code will actually only reside once in memory), but when the modul is loaded inside the child and the source changes, it could be happen, that one child has loaded an ealier version and another child has loaded a later version of that module, depending on the time the module is actualy loaded by the child.

That explains, why sometimes it works and sometimes it doesn't, simply because different childs has loaded different versions of the same module and when you reload your page you hit different childs of Apache!

Now there is one point that is special to Embperl to add. Since Embperl compiles every page in a different namespace, a module that doesn't contains a package foo statement is compiled in the namespace of the page where it is first loaded. Because Perl will not load the module a second time, every other page will not see subs and vars that are defined in the loaded module. This could be simply avoided by giving every module that should be loaded via use/require an explicit namespace via the package statement.

So what can we do?


If a module change, simply restart Apache. That's works always.


Use Apache::StatInc. This will do a stat on every loaded module and compare the modification time. If the source has changed the module is reloaded. This works most times (but not all modules can be cleanly reloaded) and as the number of loaded modules increase, your sever will slow down, because of the stat it has to do for every module.


Use do instead of require. do will execute your file everytime it is used. This also adds overhead, but this may be accpetable for small files or in a debugging environement. (NOTE: Be sure to check $@ after a do, because do works like eval)


=head2 Why doesn't the following line work?

   [+ $var . "<b>". $foo . "</b>". $bar +]

See what we mean? This is an Escaping & Unescaping problem for sure. You need to escape <b> as ' &lt;b&gt ' and you probably also need to read the section on Escaping & Unescaping...

=head2 I'm getting: "Glob not terminated at ..."

This might be a problem with Escaping & Unescaping as well.

=head2 My HTML is getting stripped out.

Sounds like a problem with Escaping & Unescaping again!

Unless, of course, you have already read the section on Escaping & Unescaping, and it is still happening... Like if you are using optRawInput and your HTML is _still_ being stripped out...

=head2 I _am_ using optRawInput, and my HTML _is_ still being stripped out!

Aha! Well that's different! Never mind..

It can be easy to accidentally set optRawInput too late in your code...

Try setting it in an extra Perl block S<( [- $optRawInput = 1 -] )> earlier in the code, or in the server config, and see if that doesn't solve the problem... (optRawInput must be set before the block that uses it begins, as the block which uses it shouldn't be translated).

=head2 Help! I got a SIGSEGV! Ack!

If Embperl is not compiled at server startup, it can cause error messages, SEGfaults, core dumps, buffer overflow, etc - especially if you are using another module inside an Embperl page. As far as anyone can tell, this seems to be a Perl/mod_perl problem - but maybe not. If you have any ideas, let me know.

To see the steps for loading Embperl at server startup, please see the section Downloading, Compiling & Installing.

NOTE: When mod_perl is compiled with USE_DSO it behaves vice versa and you may get SIGSEGVs when Embper is loaded at server startup time.

=head2 I am having troubles with using Embperl in combination with Apache::Include inside a Apache::Registry script.

This is a known problem, but it is a problem with mod_perl rather than with Embperl. It looks like mod_perl clears the request_rec after the first subrequest, so that it later doesn't know which subrequest was intended (unless it's explicitly specified). Try using:

    Apache::Include->virtual("test.epl", $r);

(instead of just Apache::Include->virtual("test.epl"); where $r is the apache request rec)

=head2 I can't get PerlSendHeader to work under Embperl?

You don't need PerlSendHeader when using Embperl - Embperl always sends its own httpd header.

=head2 But how do I customize the header that Embperl is sending?

You'll find the answer to this and many other header issues in the Common Questions section.

=head2 I can't figure out how to split a 'while' statement across two [- -] segments

That isn't surprising, as you cannot split Perl statements across multiple [- -] blocks in Embperl :) You need to use a metacommand for that. The [$while$] metacommand comes to mind... :)

For a list of all possible metacommands, see the section on Meta-Commands in the Embperl documentation.

        [$ while $st -> fetch $]
                #some html or other Embperl blocks goes here
        [$ endwhile $]

Newer Embperl versions (1.2b3 and above) supports the [* *] which can be used for such purposes.

        [* while ($st -> fetch) { *]
                #some html or other Embperl blocks goes here
        [* } *]

While the later can use all Perl control structures, the first seems to me more readable and is better debugable, because Embperl controls the execution of the control structure it can do a quite better job in debug logging.

=head2 My HTML tags like '<' '>' and '"' are being translated to &lt;, &gt; !!!

Hey! Not you again!? I thought we already sent you to the Escaping & Unescaping section of the FAQ?!?! ;)

=head2 Netscape asks to reload the document

If you have something like this in your source, it may be the problem:

    <META HTTP-EQUIV="content-type" CONTENT="text/html;charset=iso-8859-1">

Netscape seems to have a problem in such cases, because the http header is only content-type text/html, while the META HTTP-EQUIV has an additional charset specified. If you turn optEarlyHttpHeader off, Embperl will automatically set the http header to be the same as the META HTTP-EQUIV.

=head2 I get "Stack underflow"

The problem often occurs, when you have a <table> tag in one file and a </table> tag in another file and you both include them in a main page (e.g. as header and footer). There are two workarounds for this problem:


1. Set optDisableTableScan


This will avoid that Embperl takes any action on tables. You can disable/enable this (also multiple times) inside the page with

  [- $optDisableTableScan = 1 -]

If you put this at the top of your header/footer which you include with Execute, then the main page will still process dynamic tables.


2. Add a <table> as comment


Add the following to the top of the footer document:

  <!-- <table><tr><td> -->

This will work also, because Embperl (1.x) will not scan for html comments

=head1 Common Questions

The most common questions of all deal with Escaping & Unescaping - they are so common that the whole next section is devoted to them. Less common questions are addressed here:

=head2 How can I get my HTML files to be converted into Perl code which, as a whole, could then be compiled as function so that I could, for instance, fetch Perl docs from the Formatter table and compile them the way AUTOLOAD does.

Embperl cannot covert your HTML into one piece of Perl-code, but you can wrap the call to Execute into a Perl function and let AUTOLOAD call it.

=head2 I have an HTML page which is dynamically generated at runtime and should be post-processed by Embperl. How can I do this?


1.) Generate the page within a normal CGI/Apache::Registry script and put the result into a scalar - then you can call HTML::Embperl::Execute to post-process your document. Execute can either send the document to the browser or put it into another scalar for further processing.


2.) Use EMBPERL_INPUT_FUNC (1.1b1 and above). With this configuration directive, you can specify a custom input function which reads the HTML source from the disk or even from a database. Embperl also provides the function ProxyInput, which allows you to get input from another web server altogether.


3.) Look at the module Apache::EmbperlChain, which is able to chain multiple modules, including Embperl, together.

=head2 How can I customise the header that Embperl is sending?

You can write it as

    <meta http-equiv="Content-Type" content="text/html">

(Embperl will automatically insert all meta http-equiv tags into the http header)

or use %http_headers_out

    [- $http_headers_out{'Content-Type'} = 'text/html' -]

or (only when running under mod_perl) you can use

    [- $req_rec -> content_type ('text/html') -]

=head2 Can I use Embperl to send cookies?

Yes. Embperl sends its own headers, so all you have to do to send cookies is to remember to print an additional header.

Example Code:


1.) in documents, add

    <META HTTP-EQUIV="Set-Cookie" CONTENT="[+ $cookie +] = [+ $value +]">

2.) or use %http_headers_out

    [- $http_headers_out{'Set-Cookie'} = "$cookie=$value" -]

3.) or - using mod_perl's functionality - use

    [- $req_rec ->  header_out("Set-Cookie" => "$cookie=$value"); -]

NOTE: You make also take a look at Embperls (1.2b2 and above) ability to handle sessions for you inside the %udat and %mdat hashes.

=head2 Can I do a Redirect with Embperl?

The following way works with mod_perl and as cgi:

  [- $http_headers_out{'Location'} = "http://www.ecos.de/embperl/" -]

the status of the request will automaticly set to 301.

or use the mod_perl function Apache::header_out.

Example Code:

    use Apache;
    use Apache::Constants qw(REDIRECT);

    $req_rec->header_out("Location" => "http://$ENV{HTTP_HOST}/specials/");

If there is nothing more to do on this page, you may call exit directly after setting the status.

=head2 Can I serve random GIFs with Embperl? (Will Lincoln Stein's GD.pm module work with Embperl??)

As always, there is more than one way to do this - especially as this is more of a question of how you are coding your HTML than how you are coding your Embperl.

Here are some ideas:


1.) You could include an IMG tag which points to your cgi-bin, where a regular CGI script serves the graphics.


2.) You could be running Apache::Registry, which can generate on-the-fly GIFs using GD. (This is just the same as if you were including the GD image from a static page or from another CGI script, but it allows all of the appropriate logic to live in a single document, which might be appropriate for some Embperl users).

If you think of another way, or come up with some sample code, I'd love to hear from you, so that I could add it to the FAQ...

=head2 Can I use Embperl as a template for forms? Can I make form values persist (like with "vanilla" CGI)? Does Embperl rewrite my template file so that parameters of things like INPUT/TEXTAREA/SELECT persist?

Yes. Your page design staff should just be able to say <input name="foo"> and let the default attributes of "foo" be defined elsewhere - for instance in a settings file. In this case, %fdat should be pre-set with your default values. Setting $fdat{foo} = "abc" will cause Embperl to change the above code to <input name="foo" value="abc">.

=head2 Does Embperl automatically add HIDDEN fields?

The [$hidden$] metacommand creates hidden fields for every entry in %fdat which was not used by any other input tag so far.

You can also try something like this:

    $fdat{foo} = "abc" ;
    $fdat{bar} = "xyz" ;
    <input name="foo">


and Embperl will create:

    <input name="foo" value="abc">
    <input type=hidden name="bar" value="xyz">

For a list of all possible metacommands, see the section on Meta-Commands in the Embperl documentation.

=head2 What about security? Is Embperl Secure?

Just like anything else, Embperl is as secure as you make it. Embperl incorporates Safe.pm, which will make it impossible to accidentally access other Packages - it also permits the Administrator to disable Perl opcodes, etc.

For more on security, please see Embperl/(Safe-)Namespaces and opcode restrictions in the Embperl documentation.

=head2 Is there any plan to make Embperl an Object so someone could subclass it and override certain of its methods? (For example, I'd like to let it parse the file for me, but then let me control the manipulation of the form tags.)

Embperl is going to be an Object from version 1.2b1. This, among other things, make it re-entrant, so that you will be able to call Execute from within an Embperl page. It will also mean that Embperl will come with hooks, which will allow you to alter or change the way Embperl processes code. The details have not all been worked out yet, but I'm working on it... :)

=head2 Are Embperl routines currently pre-compiled or even cached, or are only fragments cached?

All embedded Perl code is compiled the first time it is executed and cached for later use. The second time the code is executed, only the precompiled p-code is called.

Every code block is compiled as a single subroutine. The HTML text between the Perl block is still read from the file.

=head2 Why are Perl blocks broken up into single subroutines?


1.) It makes it easier to process the HTML tags between the Perl blocks - this gives you more control over what's happening


2.) If you compiled _everything_ to Perl, you would hold all of the HTML text in memory, and your Apache child processes would grow and grow... But often-accessed documents are still held in memory by your os disk cache, which is much more memory-efficient.


3.) There is only so far that you can go with precompiling until you reach the point of diminishing returns. My guess is that converting dynamic tables and other HTML processing to Perl at this point in Embperl's development would actually slow down operation.

=head2 Can I pass QUERY_STRING information to an HTML::Embperl::Execute call?

With Embperl 1.0 and higher, you can do this. QUERY_STRING is set as $ENV{QUERY_STRING} by default. Alternatively, you can use the fdat parameter to pass values to %fdat.

=head2 How to include other files into Embperl pages?

I am using embedded Perl on my site and am curious if I can use it for server side includes. I want to embed the contents of file x.html into file y.html such that whenever I change x.html, displaying y.html will also reflect this change. How do I do it using embedded perl?

You need Embperl 1.2b4 or above. Then you can say inside of y.html:

 [- Execute ('x.html') -]

=head2 EmbPerl iteration without indexing

I have a rather large table in a database which I'd like to display using EmbPerl. All of the examples show a process of fetching all the data first, then iterating through it using $row and $col, like this:

   $sth = $dbh -> prepare ("select * from $comptbl order by SubSystem");
   $sth -> execute;
   $dref = $sth -> fetchall_arrayref;
      ... $dref -> [$row][0] ...

I'd prefer to fetch the data one row at a time, how can I do this?

For solution 1 you may write

 [$while $rref = $sth -> fetch $]

Solution 2 should work like this

    <tr> [- $dummy = $row ; $rref = $sth -> fetch -]

The table ends when the expression where $row is used in some way returns <undef>. So also there is no releation between $row and the fetch, both conditions are met.

=head2 How to display arrays with undef values in it?

I'm doing a search on a table where some of the columns have NULL and
non-NULL values.  DBIx::Recordset has no problem reading this values 
The problem is that I then tried to print these values
out in a table using Embperl's  table feature, like this.
 The problem is that I got 5 rows instead of the 15 that I was expected.  I
 have been  trying all kinds of tweaks to the arguments to the Search
 function and getting nowwhere, until I re-read the Embperl docs.  Embperl
 will not print out a table row if one of the columns has an 
 expression that
 is undefined.  This is a problem since DBIx::Recordset (and DBI)
 natually uses undef to represent a NULL value for a column.  So I made a
 slight modification to my embperl code.
 <TD>defined($set[$row]{column_name1}) ? $set[$row]{column_name1} :
                                 .   .   .
 <TD>$set[$row]{column_nameN} ? $set[$row]{column_nameN} : "UNDEF"</TD>
Now all 15 rows appear as expected, with "UNDEF" representing the NULL
values in the database.

Another way top solve you problem may be:

 [- $r = $set[$row] -]
 <TD> [+ $r -> {column_name1} +] </TD>
                                 .   .   .
 <TD> [+ $r -> {column_nameN} +] </TD>

This will only refer one time to $row and the expression is defined, as long as the row could be fetched from the db. All NULL fields will be displayed as empty table cells.

=head1 Escaping & Unescaping

=head2 Escaping & Unescaping Input

By default, Embperl removes all HTML tags from the Perl source. It does this because many high-end WYSIWYG HTML Editors (like MS Front Page) insert HTML tags like <FONT> and <COLOR> in rather random places (like in the middle of your Perl code). This Embperl feature keeps things like

    [- $var  = 1; <br>
        $foo = 2 -]

permissable, so that you can enter Perl code while you mark up pages in an editor, all at once. In this example, Embperl would remove the unnecessary <br> tag and, therefore, make Perl happy. And if Perl is happy, we are all happy.

It is not difficult to change this behavior, if you are the kind of person who codes HTML in an ascii editor (like vi or emacs).

If you use a high-level HTML editor, you shouldn't have any problems with input escaping, because the editor will, for example, write a '<' as '&lt;' in the HTML code. Embperl translates this back to '<' and therefore it knows that this wasn't an HTML tag which should be removed.

Problems with input escaping only occur if you use an ascii editor. Then you will need to escape input (see the next section for details on how to do this).

To see the exact steps taken by Embperl to process a Perl-laden document, please see the section Inside Embperl in the Embperl documentation.

=head2 Ways To Escape Input:


1. Escape it -> \<H1>


NOTE: Inside double quotes you will need to use \\ (double backslash), since Perl will remove the first Escape itself.

Example: In most cases '\<tr>' but inside double-quotes "\\<tr>"


2. Turn off Escaping for all input by setting the optRawInput in EMBPERL_OPTIONS


3. Learn to avoid using HTML tags inside Perl code. Once you get the hang of it, you'll love it.

Here is one example of how to do it:

    [- $output = "<bold>Hello world</bold>" -]
    [+ $output +]


    [- $output = "Hello world<bold>" -]

this outputs

    Hello world


    <bold>[+ $output +]</bold>

this outputs

    <bold>Hello world</bold>

And here is another example of how to do it:

    @a = ('a', 'b', 'c') ;
    foreach $i (0..2)
        $output. = "<tr><td>Row $a[$i]</td></tr>" ;
    [+ $output +]

The output here would be:

    <table>Row aRow bRow c</table>

The Embperl version is

    @a = ('a', 'b', 'c') ;
    <tr><td>Row [+ $a[$row] +]</td></tr>" ;

The output will be

    <tr><td>Row a</td></tr>" ;
    <tr><td>Row b</td></tr>" ;
    <tr><td>Row c</td></tr>" ;

And another: This elegant solution shows you how to take advantage of Embperl's ability to create dynamic tables:

    use DBI;

    my $dbh =
    DBI->connect("DBI:mysql:database:localhost","Username","Password") ||

    $hstmt = $dbh->prepare("select ID, Heading from Shops order by Heading");
    $dat = $hstmt->fetchall_arrayref() ;
    <table border=1>
    <tr><td>[+ $$dat[$row][$col] +]</td></tr>

This HTML code will then display the contents of the whole array.

=head2 Escaping & Unescaping Output

Embperl will also escape the output - so <H1> will be translated to &lt;H1&gt;

To see the exact steps taken by Embperl to process a Perl-laden document, please see Inside Embperl in the Embperl documentation.

=head2 Ways To Escape Output:


1.) Escape it -> \\<H1>

    (You need a double backslash \\, because
    the first one is removed by Perl and the second by Embperl.

2.) set $escmode = 0 -> [- $escmode = 0 ; -]


3.) set SetEnv EMBPERL_ESCMODE 0 in your srm.conf

=head1 Debugging

=head2 I am having a hard time debugging Embperl code

Have you, umm, checked the error log? ;)

Have you tried setting debug flags higher by resetting EMBPERL_DEBUG in the server config files? (And still higher? :)

dbgMem isn't usually very useful as it always outputs a lot of allocation. dbgFlushLog and dbgFlushOutput should be used if (and only if) you are debugging SIGSEGVs.

For easy debugging, you can tell Embperl to display a link at the top of each page to your log file. Then every error displayed in an error page is a link to the corresponding position in the logfile, so you can easily find the place where something is going wrong

For more on using HTML links to the Embperl error log, see Embperl/EMBPERL_DEBUG in the Embperldocs.

=head2 Embperl is running slow.

There are some debugging settings which may cause Embperl to drastically slow down. If you are done with debugging, set debugging bits back to normal.

Also, using dbgFlushLog and dbgFlushOutput will make execution much slower. These are only intended for debugging SIGSEGVs.

Never set all debugging bits!

=head2 How can I improve Embperl's performance?


1.) Load Embperl at server startup. This will cause UNIX systems to only allocate memory once, and not for each child process. This reduces memory use, especially the need to swap additional memory.


2.) Disable all unneeded debugging flags. You should never set dbgFlushLog dbgFlushOutput, dbgMem and dbgEvalNoCache in a production environment.


3.) You may also want to take a look at the available options you can set via EMBPERL_OPTIONS. For example optDisableChdir, will speed up processing because it avoid the change directory before every request.

=head1 Customizing

=head2 How can I fiddle with the default values? How can I override or alter this or that behavior?

Usually, defaults are set in a way that is likely to make most sense for a majority of users. As of version 1.0, Embperl allows much more flexibility in tweaking your own default values than before. Take a look at EMBERPL_OPTIONS.

=head2 I'd like to (temporarily) disable some of Embperl's features. What can be customized?


1.) Use optDisableHtmlScan to disable processing of html tags. If this is set, Embperl will only pay attention to these types of constructs:


S<[+/-/!/$ .... $/!/-/+]>


2.) optDisableTableScan, optDisableInputScan and optDisableMetaScan can be used to disable individual parts of HTML processing.


You may set these flags in your server config, or at runtime:

    [+ $optDisableHtmlScan = 1 +]
    <table> foo </table>
    [+ $optDisableHtmlScan = 0 +]

=head2 How can I disable auto-tables?

Set optDisableTableScan in EMBPERL_OPTIONS

=head2 How can I change predefined values like $escmode from my Toolbox module?

    $HTML::Embperl::escmode = 0 ;

Predefined values in Embperl are simply aliases for $HTML::Embperl::foo (for instance, $Z<>escmode is an alias for $HTML::Embperl::escmode)

=head2 How can I customize the header that Embperl is sending?

You'll find the answer to this and many other header issues in the Common Questions section.

=head2 How can I use a different character set? ASCII values over 128 are showing up as ? (question marks)!

This is caused by the translation of characters to HTML escapes. Embperl translates them to escapes which are then sometimes not understood by the browser, which may display a "?" instead, because it is using the wrong character set.

If you want to use the escaping features of Embperl in this case, you have to adapt the file epchar.c to your character set.

The distribution contain already an epchar.c.iso-latin-2 from Jiri Novak which is an replacement for epchar.c for the iso-8859-2 (iso-latin-2) character set. If you want to use iso-latin-2, simply renmae epchar.c.iso-latin-2 to epchar.c. There is also an file epchar.c.min from Sangmook Yi, which leaves all chars above 128 untouch, which is especialy usefull for two byte charsets.

This file contains three tables:

Char2Html [] Convert characters to html escape

Char2Url [] Convert characters to url escapes (do not change this one!!)

Html2Char [] Convert html escapes to characters

You need to change the first and the last tables. Do not change the second table!!

Please make sure Char2Html contains one entry (and only one entry) for each of the 256 ascii codes (with none left undefined) in the right order, and that Html2Char is sorted by html escape.

If somebody generates new tables for national character sets, please send a copy to the author, so it can be included it in future versions of Embperl.

=head1 Optimizing & Fine-Tuning

=head2 How can I be sure that Embperl is re-compiling my page template (and the Perl blocks contained in it) only when needed, and not each time?

As long as your input file's time stamp stays the same, Embperl will only compile the script the first time it's called. When you use the Execute function, Embperl will recompile the script only if the input file and mtime paramenters have changed since the last time the script was called.

You can verfiy this by setting dbgDefEval. Now, every time a Perl block is compiled, Embperl logs a line starting with DEF:. You will see this line only on the first request. The cached Perl blocks are stored as a set of subroutines in the namespace of the document. (HTML::Embperl::DOC::_<n> is the default) Look at the logfile to see the actual name.

=head2 How can I pre-compile pages, so that each httpd child doesn't have to have its own separate copies of the pre-compiled pages?

To pre-compile pages, just call Execute once for every file at server startup in your startup.pl file.

=head2 In what namespace does Embperl store pre-compiled data?

The cached Perl blocks are stored as a set of subroutines in the namespace of the document. (HTML::Embperl::DOC::_<n> for default) Look at the logfile to see the actual name.

=head2 I have both Embperl and ordinary Perl processes running. The docs say that Embperl uses a CGI.pm instance in its own internal processing, but they don't say how to control it. How can I get Embperl to use *my* CGI.pm object instead of creating its own?

Embperl only creates a CGI objects to process multipart form data (from fileupload). In all other cases Embperl doesn't use CGI.pm. There is no way to change this behaviour, or access the internal CGI object in case of file-uploads.

=head1 Additional Help

=head2 Where can I get more help?

You can get free support on the mod_perl mailing list. If you need commercial support (with a guarantee for response time or a solution) for Embperl, or if you want a web site where you can run your Embperl/mod_perl scripts without setting up your own web server, please send email to info@ecos.de.

Please also see the section Embperl/Support in the Embperl documentation.

=head1 SEE ALSO

some links here

=head1 AUTHOR

Gerald Richter <richter@ecos.de>

Edited by Nora Mikes <nora@radio.cz>

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