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<?php
/**
* Class Minify_Lines
* @package Minify
*/
/**
* Add line numbers in C-style comments for easier debugging of combined content
*
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
* @author Adam Pedersen (Issue 55 fix)
*/
class Minify_Lines {
/**
* Add line numbers in C-style comments
*
* This uses a very basic parser easily fooled by comment tokens inside
* strings or regexes, but, otherwise, generally clean code will not be
* mangled. URI rewriting can also be performed.
*
* @param string $content
*
* @param array $options available options:
*
* 'id': (optional) string to identify file. E.g. file name/path
*
* 'currentDir': (default null) if given, this is assumed to be the
* directory of the current CSS file. Using this, minify will rewrite
* all relative URIs in import/url declarations to correctly point to
* the desired files, and prepend a comment with debugging information about
* this process.
*
* @return string
*/
public static function minify($content, $options = array())
{
$id = (isset($options['id']) && $options['id'])
? $options['id']
: '';
$content = str_replace("\r\n", "\n", $content);
$lines = explode("\n", $content);
$numLines = count($lines);
// determine left padding
$padTo = strlen($numLines);
$inComment = false;
$i = 0;
$newLines = array();
while (null !== ($line = array_shift($lines))) {
if (('' !== $id) && (0 == $i % 50)) {
array_push($newLines, '', "/* {$id} */", '');
}
++$i;
$newLines[] = self::_addNote($line, $i, $inComment, $padTo);
$inComment = self::_eolInComment($line, $inComment);
}
$content = implode("\n", $newLines) . "\n";
// check for desired URI rewriting
w3_require_once(W3TC_LIB_MINIFY_DIR . '/Minify/CSS/UriRewriter.php');
$content = Minify_CSS_UriRewriter::rewrite($content, $options);
return $content;
}
/**
* Is the parser within a C-style comment at the end of this line?
*
* @param string $line current line of code
*
* @param bool $inComment was the parser in a comment at the
* beginning of the line?
*
* @return bool
*/
private static function _eolInComment($line, $inComment)
{
while (strlen($line)) {
$search = $inComment
? '*/'
: '/*';
$pos = strpos($line, $search);
if (false === $pos) {
return $inComment;
} else {
if ($pos == 0
|| ($inComment
? substr($line, $pos, 3)
: substr($line, $pos-1, 3)) != '*/*')
{
$inComment = ! $inComment;
}
$line = substr($line, $pos + 2);
}
}
return $inComment;
}
/**
* Prepend a comment (or note) to the given line
*
* @param string $line current line of code
*
* @param string $note content of note/comment
*
* @param bool $inComment was the parser in a comment at the
* beginning of the line?
*
* @param int $padTo minimum width of comment
*
* @return string
*/
private static function _addNote($line, $note, $inComment, $padTo)
{
return $inComment
? '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' *| ' . $line
: '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' */ ' . $line;
}
}
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