<?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;
}
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