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Bug #3077 ASP tags aren't recognized
Submitted: 1999-12-31 20:36 UTC Modified: 2001-01-30 03:41 UTC
From: djm at web dot us dot uu dot net Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.0.3pl1 OS: BSDI BSD/OS 4.0.1
Private report: No CVE-ID: None
View Developer Edit
 [1999-12-31 20:36 UTC] djm at web dot us dot uu dot net 
I'm having a lex-related problem.  I compiled PHP4.0b3 as a DSO in apache 1.3.9.
ASP-style tags and the code in them are displayed in the browser instead of being parsed, even though the httpd.conf contains
php_flag asp_tags On
phpinfo() confirms that the Local Value of asp_tags flag is On.
All of the other tags styles are parsed correctly, but stuff like 
<% echo ("You may optionally use ASP-style tags"); $variable = "boo"; %>
<%= $variable; # This is a shortcut for "<%echo .." %>
gets sent verbatim to the browser.

I've looked through zend-scanner.l and can't find anything wrong.  I tried removing the conditionals on asp_tags there, and changing the <% and %> to <@ and @>
in that file and in my PHP script to see if % was causing trouble, but neither of those approaches worked.  I also tried removing optimization when compiling
zend-scanner.c.  No effect.
This is weird.

I was able to confirm that I was getting my changed scanner by breaking the rules for identifying the short SGML tags.  I found that there's a missing dependency because I had to
rm libzend/libzend.la
in order to force the php module to be rebuilt after the scanner changed.

I'm using PHP compiled as a DSO with apache 1.3.9.
Compiled using flex version 2.5.4 and gcc 2.7.2.1.

Patches

Pull Requests

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 [1999-12-31 21:30 UTC] djm at web dot us dot uu dot net 
Ok, I have a workaround, and a related bug fix.
I think the first time I missed an occurrence of asp_tags in zend-scanner.l.
This time I did a global search and replace, and ASP tags started working.  phpinfo() still shows that I set the asp_tags flag On, so I don't understand why this made a difference.

Once I got that working, I found a clearer bug: the scanner doesn't support one-line comments in ASP tags.
Even though they're shown in the ASP tags example at
http://www.php.net/manual/language.basic-syntax.php3

Here are the changes I made to get it working:

--- zend-scanner.l      1999/12/30 22:31:18     1.1.1.2
+++ zend-scanner.l      2000/01/01 02:24:16
@@ -1031,7 +1031,7 @@
 
 
 <INITIAL>"<%="|"<?=" {
-       if ((yytext[1]=='%' && CG(asp_tags))
+       if ((yytext[1]=='%' && CG(short_tags))
                || (yytext[1]=='?' && CG(short_tags))) {
                zendlval->value.str.val = yytext; /* no copying - intentional */
                zendlval->value.str.len = yyleng;
@@ -1048,7 +1048,7 @@
 
 
 <INITIAL>"<%" {
-       if (CG(asp_tags)) {
+       if (CG(short_tags)) {
                zendlval->value.str.val = yytext; /* no copying - intentional */
                zendlval->value.str.len = yyleng;
                zendlval->type = IS_STRING;
@@ -1111,7 +1111,7 @@
 }
 
 
-<ST_IN_SCRIPTING>([#]|"//")([^\n\r?]|"?"[^>\n\r])*("?\n"|"?\r\n")? { /* eat one line comments */
+<ST_IN_SCRIPTING>([#]|"//")([^\n\r?%]|[?%][^>\n\r])*([?%]"\n"|[?%]"\r\n")? { /* eat one line comments */
        HANDLE_NEWLINE(yytext[yyleng-1]);
        return T_COMMENT;
 }
@@ -1151,7 +1151,7 @@
        zendlval->value.str.len = yyleng;
        zendlval->type = IS_STRING;
        HANDLE_NEWLINES(yytext,yyleng);
-       if (CG(asp_tags)) {
+       if (CG(short_tags)) {
                BEGIN(INITIAL);
                return T_CLOSE_TAG;  /* implicit ';' at php-end tag */
        } else {
 [2000-06-06 21:33 UTC] andi at cvs dot php dot net 
This should be fixed in the latest CVS.
Please grab it or in about 24 hours get the latest snapshot from snaps.php.net
 [2000-10-18 19:16 UTC] djm at web dot us dot uu dot net 
This is partly fixed in 4.0.3pl1.  ASP tags are recognized, but they still don't work with single-line comments.  You still need to apply the patch I submitted for the "eat one line comments" line of the lexer.  All it does is replace "?" with "[?%]" in the regexp so that it works for <% as well as <?.  Of course, if you have asp_tags off, you might not want that to happen... I'm not sure what's best in that case.  

Here is a valid PHP script that gets a parse error from 4.0.3pl1.

<html><head><title>comments test</title></head>
<body>
<hr>
<?php echo("Hash comments work\n"); $variable="blah"; # never mind this stuff ?>
<?= $variable; # This is a shortcut for "<?echo .." ?>
<p>
<% echo ("You may optionally use ASP-style tags"); $variable = "boo"; %>
<% echo (" (if they work)"); # this should be ignored also %>
<%= $variable; # This is a shortcut for "<%echo .." %>
<hr>
<? phpinfo() ?>
</body>
</html>
 [2001-01-06 00:55 UTC] cynic@php.net 
Could you please check if this exists in 4.0.4 or latest CVS? ASP-style tags and single line comments work for me(TM).
 [2001-01-30 03:41 UTC] sniper@php.net 
No feedback. And should be fixed.

--Jani
 
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