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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((string) $numLines); // e.g. 103 lines = 3 digits
$inComment = false;
$i = 0;
$newLines = array();
while (null !== ($line = array_shift($lines))) {
if (('' !== $id) && (0 === $i % 50)) {
if ($inComment) {
array_push($newLines, '', "/* {$id} *|", '');
} else {
array_push($newLines, '', "/* {$id} */", '');
}
}
++$i;
$newLines[] = self::_addNote($line, $i, $inComment, $padTo);
$inComment = self::_eolInComment($line, $inComment);
}
$content = implode("\n", $newLines) . "\n";
// check for desired URI rewriting
if (isset($options['currentDir'])) {
Minify_CSS_UriRewriter::$debugText = '';
$docRoot = isset($options['docRoot']) ? $options['docRoot'] : $_SERVER['DOCUMENT_ROOT'];
$symlinks = isset($options['symlinks']) ? $options['symlinks'] : array();
$content = Minify_CSS_UriRewriter::rewrite($content, $options['currentDir'], $docRoot, $symlinks);
$content = "/* Minify_CSS_UriRewriter::\$debugText\n\n"
. Minify_CSS_UriRewriter::$debugText . "*/\n"
. $content;
}
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 $inComment was the parser in a C-style comment at the
* beginning of the previous line?
*
* @return bool
*/
private static function _eolInComment($line, $inComment)
{
while (strlen($line)) {
if ($inComment) {
// only "*/" can end the comment
$index = self::_find($line, '*/');
if ($index === false) {
return true;
}
// stop comment and keep walking line
$inComment = false;
@$line = (string)substr($line, $index + 2);
continue;
}
// look for "//" and "/*"
$single = self::_find($line, '//');
$multi = self::_find($line, '/*');
if ($multi === false) {
return false;
}
if ($single === false || $multi < $single) {
// start comment and keep walking line
$inComment = true;
@$line = (string)substr($line, $multi + 2);
continue;
}
// a single-line comment preceeded it
return false;
}
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, $padTo)
{
if ($inComment) {
$line = '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' *| ' . $line;
} else {
$line = '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' */ ' . $line;
}
return rtrim($line);
}
/**
* Find a token trying to avoid false positives
*
* @param string $str String containing the token
* @param string $token Token being checked
* @return bool
*/
private static function _find($str, $token)
{
switch ($token) {
case '//':
$fakes = array(
'://' => 1,
'"//' => 1,
'\'//' => 1,
'".//' => 2,
'\'.//' => 2,
);
break;
case '/*':
$fakes = array(
'"/*' => 1,
'\'/*' => 1,
'"//*' => 2,
'\'//*' => 2,
'".//*' => 3,
'\'.//*' => 3,
'*/*' => 1,
'\\/*' => 1,
);
break;
default:
$fakes = array();
}
$index = strpos($str, $token);
$offset = 0;
while ($index !== false) {
foreach ($fakes as $fake => $skip) {
$check = substr($str, $index - $skip, strlen($fake));
if ($check === $fake) {
// move offset and scan again
$offset += $index + strlen($token);
$index = strpos($str, $token, $offset);
break;
}
}
// legitimate find
return $index;
}
return $index;
}
}