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File: libs/smarty/plugins/outputfilter.trimwhitespace.php

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File: libs/smarty/plugins/outputfilter.trimwhitespace.php
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: MVC 4 Dummies
Web development PHP MVC framework
Author: By
Last change:
Date: 7 years ago
Size: 3,420 bytes
 

Contents

Class file image Download
<?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 Conditional Comments
   
if (preg_match_all('#<!--\[[^\]]+\]>.*?<!\[[^\]]+\]-->#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|pre|textarea)[^>]*>.*?</\\1>#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*(["\'])[^\3]*?\3)|<[a-z0-9_]+)\s+([a-z/>])#is' => '\1 \4',
       
// 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;
}

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