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<?php
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/**
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* Smarty plugin
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*
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* @package Smarty
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* @subpackage PluginsFilter
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*/
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/**
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* Smarty trimwhitespace outputfilter plugin
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* Trim unnecessary whitespace from HTML markup.
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*
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* @author Rodney Rehm
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*
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* @param string $source input string
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*
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* @return string filtered output
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* @todo substr_replace() is not overloaded by mbstring.func_overload - so this function might fail!
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*/
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function smarty_outputfilter_trimwhitespace($source)
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{
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$store = array();
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$_store = 0;
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$_offset = 0;
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// Unify Line-Breaks to \n
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$source = preg_replace('/\015\012|\015|\012/', "\n", $source);
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// capture Internet Explorer and KnockoutJS Conditional Comments
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if (preg_match_all(
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'#<!--((\[[^\]]+\]>.*?<!\[[^\]]+\])|(\s*/?ko\s+.+))-->#is',
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$source,
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$matches,
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PREG_OFFSET_CAPTURE | PREG_SET_ORDER
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)
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) {
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foreach ($matches as $match) {
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$store[] = $match[ 0 ][ 0 ];
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$_length = strlen($match[ 0 ][ 0 ]);
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$replace = '@!@SMARTY:' . $_store . ':SMARTY@!@';
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$source = substr_replace($source, $replace, $match[ 0 ][ 1 ] - $_offset, $_length);
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$_offset += $_length - strlen($replace);
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$_store++;
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}
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}
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// Strip all HTML-Comments
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// yes, even the ones in <script> - see http://stackoverflow.com/a/808850/515124
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$source = preg_replace('#<!--.*?-->#ms', '', $source);
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// capture html elements not to be messed with
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$_offset = 0;
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if (preg_match_all(
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'#(<script[^>]*>.*?</script[^>]*>)|(<textarea[^>]*>.*?</textarea[^>]*>)|(<pre[^>]*>.*?</pre[^>]*>)#is',
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$source,
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$matches,
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PREG_OFFSET_CAPTURE | PREG_SET_ORDER
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)
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) {
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foreach ($matches as $match) {
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$store[] = $match[ 0 ][ 0 ];
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$_length = strlen($match[ 0 ][ 0 ]);
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$replace = '@!@SMARTY:' . $_store . ':SMARTY@!@';
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$source = substr_replace($source, $replace, $match[ 0 ][ 1 ] - $_offset, $_length);
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$_offset += $_length - strlen($replace);
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$_store++;
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}
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}
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$expressions = array(// replace multiple spaces between tags by a single space
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// can't remove them entirely, becaue that might break poorly implemented CSS display:inline-block elements
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'#(:SMARTY@!@|>)\s+(?=@!@SMARTY:|<)#s' => '\1 \2',
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// remove spaces between attributes (but not in attribute values!)
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'#(([a-z0-9]\s*=\s*("[^"]*?")|(\'[^\']*?\'))|<[a-z0-9_]+)\s+([a-z/>])#is' => '\1 \5',
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// note: for some very weird reason trim() seems to remove spaces inside attributes.
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// maybe a \0 byte or something is interfering?
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'#^\s+<#Ss' => '<',
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'#>\s+$#Ss' => '>',
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);
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$source = preg_replace(array_keys($expressions), array_values($expressions), $source);
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// note: for some very weird reason trim() seems to remove spaces inside attributes.
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// maybe a \0 byte or something is interfering?
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// $source = trim( $source );
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$_offset = 0;
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if (preg_match_all('#@!@SMARTY:([0-9]+):SMARTY@!@#is', $source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
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foreach ($matches as $match) {
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$_length = strlen($match[ 0 ][ 0 ]);
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$replace = $store[ $match[ 1 ][ 0 ] ];
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$source = substr_replace($source, $replace, $match[ 0 ][ 1 ] + $_offset, $_length);
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$_offset += strlen($replace) - $_length;
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$_store++;
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}
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}
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return $source;
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}
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