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File: resources/Smarty/plugins/outputfilter.trimwhitespace.php

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File: resources/Smarty/plugins/outputfilter.trimwhitespace.php
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: Basic Controller Framework
Framework to route requests configured controllers
Author: By
Last change:
Date: 8 months ago
Size: 3,567 bytes
 

Contents

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<?php
/**
 * Smarty plugin
 *
 * @package Smarty
 * @subpackage PluginsFilter
 */

/**
 * Smarty trimwhitespace outputfilter plugin
 * Trim unnecessary whitespace from HTML markup.
 *
 * @author Rodney Rehm
 *
 * @param string $source input string
 *
 * @return string filtered output
 * @todo substr_replace() is not overloaded by mbstring.func_overload - so this function might fail!
 */
function smarty_outputfilter_trimwhitespace($source)
{
   
$store = array();
   
$_store = 0;
   
$_offset = 0;

   
// Unify Line-Breaks to \n
   
$source = preg_replace("/\015\012|\015|\012/", "\n", $source);

   
// capture Internet Explorer and KnockoutJS Conditional Comments
   
if (preg_match_all('#<!--((\[[^\]]+\]>.*?<!\[[^\]]+\])|(\s*/?ko\s+.+))-->#is', $source, $matches,
                      
PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
        foreach (
$matches as $match) {
           
$store[] = $match[ 0 ][ 0 ];
           
$_length = strlen($match[ 0 ][ 0 ]);
           
$replace = '@!@SMARTY:' . $_store . ':SMARTY@!@';
           
$source = substr_replace($source, $replace, $match[ 0 ][ 1 ] - $_offset, $_length);

           
$_offset += $_length - strlen($replace);
           
$_store ++;
        }
    }

   
// Strip all HTML-Comments
    // yes, even the ones in <script> - see http://stackoverflow.com/a/808850/515124
   
$source = preg_replace('#<!--.*?-->#ms', '', $source);

   
// capture html elements not to be messed with
   
$_offset = 0;
    if (
preg_match_all('#(<script[^>]*>.*?</script[^>]*>)|(<textarea[^>]*>.*?</textarea[^>]*>)|(<pre[^>]*>.*?</pre[^>]*>)#is',
                      
$source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
        foreach (
$matches as $match) {
           
$store[] = $match[ 0 ][ 0 ];
           
$_length = strlen($match[ 0 ][ 0 ]);
           
$replace = '@!@SMARTY:' . $_store . ':SMARTY@!@';
           
$source = substr_replace($source, $replace, $match[ 0 ][ 1 ] - $_offset, $_length);

           
$_offset += $_length - strlen($replace);
           
$_store ++;
        }
    }

   
$expressions = array(// replace multiple spaces between tags by a single space
                         // can't remove them entirely, becaue that might break poorly implemented CSS display:inline-block elements
                        
'#(:SMARTY@!@|>)\s+(?=@!@SMARTY:|<)#s' => '\1 \2',
                        
// remove spaces between attributes (but not in attribute values!)
                        
'#(([a-z0-9]\s*=\s*("[^"]*?")|(\'[^\']*?\'))|<[a-z0-9_]+)\s+([a-z/>])#is' => '\1 \5',
                        
// note: for some very weird reason trim() seems to remove spaces inside attributes.
                         // maybe a \0 byte or something is interfering?
                        
'#^\s+<#Ss' => '<', '#>\s+$#Ss' => '>',);

   
$source = preg_replace(array_keys($expressions), array_values($expressions), $source);
   
// note: for some very weird reason trim() seems to remove spaces inside attributes.
    // maybe a \0 byte or something is interfering?
    // $source = trim( $source );

   
$_offset = 0;
    if (
preg_match_all('#@!@SMARTY:([0-9]+):SMARTY@!@#is', $source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
        foreach (
$matches as $match) {
           
$_length = strlen($match[ 0 ][ 0 ]);
           
$replace = $store[ $match[ 1 ][ 0 ] ];
           
$source = substr_replace($source, $replace, $match[ 0 ][ 1 ] + $_offset, $_length);

           
$_offset += strlen($replace) - $_length;
           
$_store ++;
        }
    }

    return
$source;
}