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<?php
/**
* Smarty Whitespace Control
*
* {-tag} remove white space infront of tag up to the previous non-whitespace character or beginning of the line
* "text \n\n\t {-tag}" -> "text \n\n{tag}"
* "text \n\n\t text\t {-tag}" -> "text \n\n\t text{tag}"
* {--tag} remove white space infront of tag up to the previous non-whitespace character
* "text \n\n\t {--tag}" -> "text{tag}"
* "text \n\n\t text\t {--tag}" -> "text \n\n\t text{tag}"
* {+-tag}
* {-+tag} replace white space infront of tag up to the previous non-whitespace character by a single line-break
* "text \n\n\t {-+tag}" -> "text\n{tag}"
* "text \n\n\t text\t {-+tag}" -> "text \n\n\t text\n{tag}"
*
* {tag-} remove white space after tag up to the next non-whitespace character or end of the line
* "{tag-} \n\n\t text" -> "{tag}\n\n\t text"
* "{tag-} text \n\n\t text" -> "{tag}text \n\n\t text"
* {tag--} remove white space after tag up to the next non-whitespace character
* "{tag--} \n\n\t text" -> "{tag}text"
* "{tag--} text \n\n\t text" -> "{tag}text \n\n\t text"
* {tag+-}
* {tag-+} replace white space after tag up to the next non-whitespace character by a single line-break
* "{tag-+} \n\n\t text" -> "{tag}\n\ntext"
* "{tag-+} text \n\n\t text" -> "{tag}\n\ntext \n\n\t text"
*
* {tag+} replace white space after tag up to the end of the line with an additional line-break
* "{tag+} \n\t text" -> "{tag}\n\n\t text"
* "{tag+} text \n\n\t text" -> "{tag}\n\ntext \n\n\t text"
*
* Any combination of the above, say {--tag+} is possible. Any + modifiers are executed before - modifiers, so
* "{tag+-}{--tag}" will lead to "{tag}{tag}"
*
* NOTE: {tag+} and {tag-+} cause two trailing \n. This is done because PHP itself throws away the first \n.
* So \n\n in the template will lead to \n in the output
*
* @param string $string raw template source
* @param Smarty_Internal_Template $template Template instance
* @return string raw template source after whitespace control was applied
* @author Rodney Rehm
*/
function smarty_prefilter_whitespace_control($string, Smarty_Internal_Template $template) {
$ldelim = $template->smarty->left_delimiter;
$rdelim = $template->smarty->right_delimiter;
$_ldelim = preg_quote($ldelim);
$_rdelim = preg_quote($rdelim);
// remove preceeding whitepsace preserving a single line-break
$string = preg_replace('#\s*'. $_ldelim .'(?:-\+|\+-)#', "\n" . $ldelim, $string);
// remove trailing whitespace preserving s single line-break
$string = preg_replace('#(?:\+-|-\+)'. $_rdelim .'\s*#', $rdelim . "\n\n", $string);
// remove preceeding whitepsace
$string = preg_replace('#\s*'. $_ldelim .'--|[^\S\r\n]*'. $_ldelim .'-#', $ldelim, $string);
// remove trailing whitespace
$string = preg_replace('#--'. $_rdelim .'\s*|-'. $_rdelim .'[^\S\r\n]*#', $rdelim, $string);
// force trailing line-break
$string = preg_replace('#\+'. $_rdelim .'(?:\s*[\r\n]|[^\S\r\n]*)#', $rdelim . "\n\n", $string);
return $string;
}
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