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-   -   Parsing Conditions? Eval? (https://vborg.vbsupport.ru/showthread.php?t=94375)

Adrian Schneider 08-15-2005 06:27 PM
Parsing Conditions? Eval?
 
I have a standalone system where users enter HTML, and I want to have some conditions in it (such as hide left block if that option is enabled). Basically in the HTML they will have something like this:

HTML Code:
<table align="center" cellpadding="0" cellspacing="0" width="760">
        <tr valign="top">
                {IFSHOWLEFTBLOCK}
                <td width="{LEFTBLOCKWIDTH}" class="leftblock">
{LEFTBLOCKS}
                </td>
                <td width="{LEFTBLOCKSPACERWIDTH}"><img src="{SPACERIMAGE}" width="{LEFTBLOCKSPACERWIDTH}" alt="" /></td>
                {/IFSHOWLEFTBLOCK}


                <td class="content">
{BLOGPOSTBIT}
                </td>


                {IFSHOWRIGHTBLOCK}
                <td width="{RIGHTBLOCKSPACERWIDTH}"><img src="{SPACERIMAGE}" alt="" width="{RIGHTBLOCKSPACERWIDTH}"/></td>
                <td width="{RIGHTBLOCKWIDTH}" class="rightblock">
{RIGHTBLOCKS}
                </td>
                {/IFSHOWRIGHTBLOCK}


        </tr>
</table>
Right now I am just using preg_replace to replace the {variables} with the corresponding $variable (preset ones, they can't use anything), and I want the same for conditions.

I'm thinking eval (but I've never used much of it before), so how would I go about doing this with the IFs? Right now I am using preg replace, so if the condition they enter is false, it replaces the condtiions with <!-- and --> (very cheap solution) and if true, replaces with "".

I do not want this like vBulletins, where it runs any PHP they enter in the conditions, only presets.

Adrian Schneider 08-18-2005 06:09 PM
/me bumps this thread

Zero Tolerance 08-18-2005 08:15 PM
Let's say you had:
PHP Code:
eval('$userpage = "' . fetch_template('YOUR_TEMPLATE') . '";'); 
Above that you would have:
PHP Code:
$vbulletin->templatecache['YOUR_TEMPLATE'] = str_replace(
                        array('{LEFTBLOCKSPACERWIDTH}'),
                        array($leftblockwidth),
                        $vbulletin->templatecache['YOUR_TEMPLATE']
                        ); 
Not sure about your if macro's though, best to just use an if in php:
PHP Code:
$leftblock = '';
if ($show['leftblock'])
{
    $leftblock = "whatever...";
} 
Hope that helps, be sure to change the array in the second code for the str_replace, and "YOUR_TEMPLATE" :)

- Zero Tolerance

Adrian Schneider 08-18-2005 08:27 PM
Hmm, I didn't know about the templatecache thing.. neat:)

Anyway I may have misunderstood, but I don't think that will help. The HTML that is being parsed is not powered by vBulletin (just stored in db).

$somevariable =
HTML Code:
<table align="center" cellpadding="0" cellspacing="0" width="760">
        <tr valign="top">
                <?php
                if ($userinfo['showleftblock'])
                {
?>
                <td width="{LEFTBLOCKWIDTH}" class="leftblock">
<?php print $leftblockbit; ?>
                </td>
                <td width="{LEFTBLOCKSPACERWIDTH}"><img src="{SPACERIMAGE}" width="{LEFTBLOCKSPACERWIDTH}" alt="" /></td>
<?                }?>
Well I edited it quickly, say if I replaced it like so from the old {if} how would I have it run the PHP while keeping the variable intact? I've never used much of eval before, and I think that's what I need to do. I'm not sure if this makes much sense... :ermm:

Zero Tolerance 08-18-2005 08:30 PM
Ah, not vb, i see, well lets say your variable for the template was "$mytemplate", you'd replace all instances of "$vbulletin->templatecache['YOUR_TEMPLATE']" with "$mytemplate", and instead of:
PHP Code:
eval('$userpage = "' . fetch_template('YOUR_TEMPLATE') . '";'); 
You would have:
PHP Code:
eval('$mytemplate = "' .  $mytemplate. '";'); 
Again as for the if statement, it would be much better for you to do it in php itself instead of the template.

- Zero Tolerance

Adrian Schneider 08-18-2005 08:40 PM
What would the difference between standard $var = val; and the eval?

The users are the ones inputing the conditions, how would I do it as you are suggesting?


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