[zoic]

I have been trying and trying but can't seem to get my regular expression to work like I want it too

I'm working on a template system for my forum and having the ability to put conditional statements within the template in the following format:

<if condition="$a == $b">
...
<else>
...
</if>

My problem is with the code that I have right now (which is extremely messy), I can't put one inside of another. I got to a point where I really need to do this for my forum now. Since I had recently learned the basics of regular expressions and have messed around with them for a bit I decided to try it that way and scrap what I had before.

This is what I have right now:

PHP Code:

<?php



function parseConditionals( $string )

{

$string = addslashes( $string );



$string = eregi_replace( '<if condition=\"([.]*)\">', '".(( \\1 ) ? ("', $string ); // need help with this part

$string = str_replace( '<else>', '") : ("', $string );

$string = str_replace( '</if>', '"))."', $string );



eval( '$string ="'.$string.'";' );



return stripslashes( $string );

}



?>

Of course the <else> and </if> were easy, just a simple str_replace, but the first one is what I'm having a problem with. I have a decent understanding of regular expressions but have tried for a couple hours with no success.

If anyone could help me out with this I'd appreciate it greatly.

[NeverMind]

PHP Code:

<?php

$string = <<<STR

<if condition="\$a == \$b">

...

<else>

...

</if>

STR;



preg_match('~<if condition="(.+)">(.*)<else>(.*)<\/if>~is', $string, $arr);



unset($arr[0]);



$string = "if ($arr[1]) {

   $arr[2]

} else {

   $arr[3]

}";



echo $string;

?>

and to make in that function:

PHP Code:

function parseConditionals( $string )

{

   $string = addslashes( $string );



   preg_match('~<if condition="(.+)">(.*)<else>(.*)<\/if>~is', $string, $arr);



   unset($arr[0]);



   $string = "if ($arr[1]) {

   $arr[2]

} else {

   $arr[3]

}";



   return $string;

} 

[zoic]

That seems to be able to work, but for only just one conditional statement..I need it to support multiple statements and one within the other like this:

Code:

<if condtion="$a==$b">

     <if condition="$c==$d">

     <else>

     </if>
<else>

     <if condition="$e==$f">

     <else>

     </if>

</if>

That's why I used the str_replace and eregi_replace before...

Thanks for your reply though

[NeverMind]

oh... here comes a recursive function
I will look into that tomorrow.. time to sleep..

[zoic]

No need anymore, I figured it out by tweaking my other code...

PHP Code:

<?php



    function parseConditionals( $string )

    {

        $string = addslashes( $string );



        $if = '<if condition=\"';

        $string = str_replace( '<else>', '" : "', $string );

        $string = str_replace( '</if>', '")."', $string );



        $if_first = strpos( $string, $if );

        $num_ifs = substr_count( $string, $if );



        for ( $i = 0; $i < $num_ifs; $i++ )

        {

            if ( $i == 0 )

            {

                $if_start = $if_first;

            }

            else

            {

                $if_start = strpos( $string, $if, ( $if_start + 1 ) );

            }



            $condition_start = ( $if_start + strlen( $if ) );

            $condition_end = strpos( $string, '\">', ( $if_start + 1 ) );



            $if_end = ( $condition_end + 3 );

            $if_len = ( $if_end - $if_start );



            $condition_value = stripslashes( substr( $string, $condition_start, ( $condition_end - $condition_start ) ) );

            $end_start = strpos( $string, $endif, ( $if_start + $if_len ) );



            $string = substr_replace( $string, '".('.$condition_value.' ? "', $if_start, $if_len );

        }



        eval( '$string = "'.$string.'";' );



        return stripslashes( $string );

    }



?>

Thanks for your help though