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Thread: What is this language?

  1. #1
    Join Date
    Aug 2007
    Location
    Washington
    Posts
    219

    What is this language?

    Sorry if this seems like an odd question or the wrong place to ask this...
    I'm redoing a website and it the html code there are sections of html with dynamic variables such as:

    HTML Code:
    <p align="center"> <font face="Verdana, sans-serif" color="#283B3C" size="2">&nbsp;Download
    High Resolution Cover Image: #&#37;related_links_html%#&nbsp;</font></td>
    What is the "%related_links_html%"? Is this some sort of PHP code or something else? I know its some sort of dynamic variable but I'm unsure exactly what language it is or where its instantiated.

  2. #2
    Join Date
    Aug 2004
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    Ankh-Morpork
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    It's not any programming language construct (at least none I know of). It's almost certainly an arbitrary place-holder which PHP (or whatever program is being used) as something searched for and replaced with some dynamic value by some function like str_replace() or preg_replace().
    "Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
    ~ Terry Pratchett in Nation

    eBookworm.us

  3. #3
    Join Date
    Aug 2007
    Location
    Washington
    Posts
    219
    Alright, found a little more information. I found this function in an include:

    PHP Code:
    /**
     * function _tplParse($strContent, $SUBS, $GLOBAL_SUBS) - called by tplParse
     * 
     * Parses $strContent - replaces tags with their values from   
     * $SUBS array or $GLOBAL_SUBS (if not in $SUBS) and returnes the parsed string.
     * 
     * input params 
     * @param - $strContent - string - string to be parsed
     * @param - $SUBS - array - tags' values
     * @param - $GLOBAL_SUBS - array - global tags' values
     *
     * @return - string - parsed string.  
    */
    function _tplParse($strContent$SUBS$GLOBAL_SUBS)
    {
        global 
    $bStrictTemplateTags;
        global 
    $strTemplatesDir;
        
        if(!isset(
    $bStrictTemplateTags)){
            
    _tplParseError("bStrictTemplateTags not defined !");
        }
        
        if(!isset(
    $strTemplatesDir)){
            
    _tplParseError("strTemplatesDir not defined !");
        }
        
        if(!
    is_array($SUBS)){
            
    _tplParseError("Invalid parameter !");
        }
        
        if(!
    is_array($GLOBAL_SUBS)){
            
    _tplParseError("Invalid parameter !");
        }
        
        
    $strContent str_replace('\r\n''\n'$strContent);
        
    $strContent str_replace('\r''\n'$strContent);


        
    $strContent preg_replace("/(^|\n)[ \t]*\/\*([^\n])*[ \t]*(\n|$)/s",'',$strContent);

        
    // parse includes

        
    preg_match_all("/%include[ ]+\"([a-zA-Z0-9_.]+)\"[ ]*%/s"$strContent$reIncludeMatch);
        for (
    $i=0$icount($reIncludeMatch[1]); $i++) {
            
    $strIncludeFile $strTemplatesDir $reIncludeMatch[1][$i];
            if(!
    _tplParseReadFileContent($strIncludeFile$strFileContent)){
                
    _tplParseError("failed to include file: $strIncludeFile");
            }
            
    $strContent str_replace($reIncludeMatch[0][$i], $strFileContent$strContent);
        }
        
        
        
    // go through sub templates
        
        
    $strBegTemplateTagRE "/%ST[ ]+([a-zA-Z0-9_]+)[ ]*%/s";
        while (
    preg_match($strBegTemplateTagRE$strContent$reBegMatch)) {
            
    $subTemplateStartTag $reBegMatch[0];
            
    $subTemplateName $reBegMatch[1];
            
    $strEndTemplateTagRE "/%ET[ ]+($subTemplateName)[ ]*%/s";
            if(!
    preg_match($strEndTemplateTagRE$strContent$reEndMatch)){
                
    _tplParseError("failed to find end template tag: $subTemplateName");
            }

            
    //$strSubTemplateRE = "/$subTemplateStartTag*$reEndMatch[0]/";
            
    $strSubTemplateRE "/$subTemplateStartTag(.*)$reEndMatch[0]/s";
            if(!
    preg_match($strSubTemplateRE$strContent$reSubMatch)){
                
    _tplParseError("Oops internal error, failed to find the subtemplate body: $subTemplateName");
            }
            
            
    $subTemplateContent $reSubMatch[0];
            
            if(!isset(
    $SUBS[$subTemplateName])){
                
    _tplParseError("no data defined for the template: $subTemplateName");
            }
            
            
    $strTemplateNewContent '';
            
    reset($SUBS[$subTemplateName]);
            while(list(
    $key$value) = each($SUBS[$subTemplateName])){
                
    $strTemplateNewContent .= _tplParse($reSubMatch[1], $value$GLOBAL_SUBS);
            }
            
            
    $strContent str_replace($subTemplateContent$strTemplateNewContent$strContent);
        }
        
    // replace tags

        
    preg_match_all("/#%([^%]+)%#/s"$strContent$reTagMatch);
        for (
    $i=0$icount($reTagMatch[1]); $i++) {
            if (isset(
    $SUBS[$reTagMatch[1][$i]])) {
                
    $strContent str_replace($reTagMatch[0][$i], $SUBS[$reTagMatch[1][$i]], $strContent);
            } else {
                if (isset(
    $GLOBAL_SUBS[$reTagMatch[1][$i]])) {
                    
    $strContent str_replace($reTagMatch[0][$i], $GLOBAL_SUBS[$reTagMatch[1][$i]], $strContent);
                } else {
                    
    $tagTitle $reTagMatch[0][$i];
                     
    _tplParseError("undefined tag: $tagTitle"$bStrictTemplateTags);
                 }
            }
        }    

        return     
    $strContent;

    Looks like it does it exactly what you said NogDog. Is this efficient in any way, shape or form? I would guess not... Is there some benefit of doing things this way?

  4. #4
    Join Date
    Apr 2007
    Posts
    1,664
    It's common in template systems. You can change a website's front end entirely and leave the backend code untouched. The functionality remaint the same you just addd the tags where you want teh previous functionality. Say your parse/replace code can change ##contactform## into a fully functioning contact form. Anyone can create and upload a template and they only need to add that tag to add a contact form. You can control the PHP backend.

    It's pretty common in collaborative open source projects like phpBB.
    Anti Linux rants are usually the result of a lack of Linux experience, while anti Windows rants are usually a result of a lot of Windows experience.

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