1 <?php

     2 /**

     3  * Smarty plugin

     4  *

     5  * @package    Smarty

     6  * @subpackage PluginsFilter

     7  */

     8 

     9 /**

    10  * Smarty trimwhitespace outputfilter plugin

    11  * Trim unnecessary whitespace from HTML markup.

    12  *

    13  * @author   Rodney Rehm

    14  *

    15  * @param string $source input string

    16  *

    17  * @return string filtered output

    18  * @todo     substr_replace() is not overloaded by mbstring.func_overload - so this function might fail!

    19  */

    20 function smarty_outputfilter_trimwhitespace($source) {

    21     $store = array();

    22     $_store = 0;

    23     $_offset = 0;

    24 

    25     // Unify Line-Breaks to \n

    26     $source = preg_replace("/\015\012|\015|\012/", "\n", $source);

    27 

    28     // capture Internet Explorer Conditional Comments

    29     if (preg_match_all('#<!--\[[^\]]+\]>.*?<!\[[^\]]+\]-->#is', $source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {

    30         foreach ($matches as $match) {

    31             $store[] = $match[0][0];

    32             $_length = strlen($match[0][0]);

    33             $replace = '@!@SMARTY:' . $_store . ':SMARTY@!@';

    34             $source = substr_replace($source, $replace, $match[0][1] - $_offset, $_length);

    35 

    36             $_offset += $_length - strlen($replace);

    37             $_store++;

    38         }

    39     }

    40 

    41     // Strip all HTML-Comments

    42     // yes, even the ones in <script> - see http://stackoverflow.com/a/808850/515124

    43     $source = preg_replace('#<!--.*?-->#ms', '', $source);

    44 

    45     // capture html elements not to be messed with

    46     $_offset = 0;

    47     if (preg_match_all('#(<script[^>]*>.*?</script[^>]*>)|(<textarea[^>]*>.*?</textarea[^>]*>)|(<pre[^>]*>.*?</pre[^>]*>)#is', $source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {

    48         foreach ($matches as $match) {

    49             $store[] = $match[0][0];

    50             $_length = strlen($match[0][0]);

    51             $replace = '@!@SMARTY:' . $_store . ':SMARTY@!@';

    52             $source = substr_replace($source, $replace, $match[0][1] - $_offset, $_length);

    53 

    54             $_offset += $_length - strlen($replace);

    55             $_store++;

    56         }

    57     }

    58 

    59     $expressions = array(

    60         // replace multiple spaces between tags by a single space

    61         // can't remove them entirely, becaue that might break poorly implemented CSS display:inline-block elements

    62         '#(:SMARTY@!@|>)\s+(?=@!@SMARTY:|<)#s' => '\1 \2',

    63         // remove spaces between attributes (but not in attribute values!)

    64         '#(([a-z0-9]\s*=\s*("[^"]*?")|(\'[^\']*?\'))|<[a-z0-9_]+)\s+([a-z/>])#is' => '\1 \5',

    65         // note: for some very weird reason trim() seems to remove spaces inside attributes.

    66         // maybe a \0 byte or something is interfering?

    67         '#^\s+<#Ss' => '<',

    68         '#>\s+$#Ss' => '>',

    69     );

    70 

    71     $source = preg_replace(array_keys($expressions), array_values($expressions), $source);

    72     // note: for some very weird reason trim() seems to remove spaces inside attributes.

    73     // maybe a \0 byte or something is interfering?

    74     // $source = trim( $source );

    75 

    76     $_offset = 0;

    77     if (preg_match_all('#@!@SMARTY:([0-9]+):SMARTY@!@#is', $source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {

    78         foreach ($matches as $match) {

    79             $_length = strlen($match[0][0]);

    80             $replace = $store[$match[1][0]];

    81             $source = substr_replace($source, $replace, $match[0][1] + $_offset, $_length);

    82 

    83             $_offset += strlen($replace) - $_length;

    84             $_store++;

    85         }

    86     }

    87 

    88     return $source;

    89 }