<?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);

 // Hackily rewrite strings with XPath expressions that are
 // likely to throw off our dumb parser (for Prototype 1.6.1).
 $content = str_replace('"/*"', '"/"+"*"', $content);
 $content = preg_replace('@([\'"])(\\.?//?)\\*@', '1ドル2ドル1ドル+1ドル*', $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 = '';
 $content = Minify_CSS_UriRewriter::rewrite(
 $content
 ,$options['currentDir']
 ,isset($options['docRoot']) ? $options['docRoot'] : $_SERVER['DOCUMENT_ROOT']
 ,isset($options['symlinks']) ? $options['symlinks'] : array()
 );
 $content = "/* Minify_CSS_UriRewriter::\$debugText\n\n" 
 . Minify_CSS_UriRewriter::$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 $inComment was the parser in a comment at the
 * beginning of the line?
 *
 * @return bool
 */
 private static function _eolInComment($line, $inComment)
 {
 // crude way to avoid things like // */
 $line = preg_replace('~//.*?(\\*/|/\\*).*~', '', $line);

 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;
 }
}