Fix MSIE conditionals regex in minify output func
Allows IE conditionals like the following to remain unmodified.
<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
Credit to joebert regex from
http://www.sitepoint.com/forums/showthread.php?696559-Regex-pattern-to-strip-HTML-comments-but-leave-conditonals&s=3eef4ceb0a59b2fdb946fa56220fb6fd&p=4678083&viewfull=1#post4678083
diff --git a/system/core/Output.php b/system/core/Output.php
index ce0500e..b452639 100644
--- a/system/core/Output.php
+++ b/system/core/Output.php
@@ -1,922 +1,922 @@
-<?php
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP 5.2.4 or newer
- *
- * NOTICE OF LICENSE
- *
- * Licensed under the Open Software License version 3.0
- *
- * This source file is subject to the Open Software License (OSL 3.0) that is
- * bundled with this package in the files license.txt / license.rst. It is
- * also available through the world wide web at this URL:
- * http://opensource.org/licenses/OSL-3.0
- * If you did not receive a copy of the license and are unable to obtain it
- * through the world wide web, please send an email to
- * licensing@ellislab.com so we can send you a copy immediately.
- *
- * @package CodeIgniter
- * @author EllisLab Dev Team
- * @copyright Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
- * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
- * @link http://codeigniter.com
- * @since Version 1.0
- * @filesource
- */
-defined('BASEPATH') OR exit('No direct script access allowed');
-
-/**
- * Output Class
- *
- * Responsible for sending final output to the browser.
- *
- * @package CodeIgniter
- * @subpackage Libraries
- * @category Output
- * @author EllisLab Dev Team
- * @link http://codeigniter.com/user_guide/libraries/output.html
- */
-class CI_Output {
-
- /**
- * Final output string
- *
- * @var string
- */
- public $final_output;
-
- /**
- * Cache expiration time
- *
- * @var int
- */
- public $cache_expiration = 0;
-
- /**
- * List of server headers
- *
- * @var array
- */
- public $headers = array();
-
- /**
- * List of mime types
- *
- * @var array
- */
- public $mimes = array();
-
- /**
- * Mime-type for the current page
- *
- * @var string
- */
- protected $mime_type = 'text/html';
-
- /**
- * Enable Profiler flag
- *
- * @var bool
- */
- public $enable_profiler = FALSE;
-
- /**
- * zLib output compression flag
- *
- * @var bool
- */
- protected $_zlib_oc = FALSE;
-
- /**
- * List of profiler sections
- *
- * @var array
- */
- protected $_profiler_sections = array();
-
- /**
- * Parse markers flag
- *
- * Whether or not to parse variables like {elapsed_time} and {memory_usage}.
- *
- * @var bool
- */
- public $parse_exec_vars = TRUE;
-
- /**
- * Class constructor
- *
- * Determines whether zLib output compression will be used.
- *
- * @return void
- */
- public function __construct()
- {
- $this->_zlib_oc = (bool) @ini_get('zlib.output_compression');
-
- // Get mime types for later
- $this->mimes =& get_mimes();
-
- log_message('debug', 'Output Class Initialized');
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Get Output
- *
- * Returns the current output string.
- *
- * @return string
- */
- public function get_output()
- {
- return $this->final_output;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set Output
- *
- * Sets the output string.
- *
- * @param string $output Output data
- * @return CI_Output
- */
- public function set_output($output)
- {
- $this->final_output = $output;
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Append Output
- *
- * Appends data onto the output string.
- *
- * @param string $output Data to append
- * @return CI_Output
- */
- public function append_output($output)
- {
- if (empty($this->final_output))
- {
- $this->final_output = $output;
- }
- else
- {
- $this->final_output .= $output;
- }
-
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set Header
- *
- * Lets you set a server header which will be sent with the final output.
- *
- * Note: If a file is cached, headers will not be sent.
- * @todo We need to figure out how to permit headers to be cached.
- *
- * @param string $header Header
- * @param bool $replace Whether to replace the old header value, if already set
- * @return CI_Output
- */
- public function set_header($header, $replace = TRUE)
- {
- // If zlib.output_compression is enabled it will compress the output,
- // but it will not modify the content-length header to compensate for
- // the reduction, causing the browser to hang waiting for more data.
- // We'll just skip content-length in those cases.
- if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) === 0)
- {
- return $this;
- }
-
- $this->headers[] = array($header, $replace);
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set Content-Type Header
- *
- * @param string $mime_type Extension of the file we're outputting
- * @param string $charset Character set (default: NULL)
- * @return CI_Output
- */
- public function set_content_type($mime_type, $charset = NULL)
- {
- if (strpos($mime_type, '/') === FALSE)
- {
- $extension = ltrim($mime_type, '.');
-
- // Is this extension supported?
- if (isset($this->mimes[$extension]))
- {
- $mime_type =& $this->mimes[$extension];
-
- if (is_array($mime_type))
- {
- $mime_type = current($mime_type);
- }
- }
- }
-
- $this->mime_type = $mime_type;
-
- if (empty($charset))
- {
- $charset = config_item('charset');
- }
-
- $header = 'Content-Type: '.$mime_type
- .(empty($charset) ? NULL : '; charset='.$charset);
-
- $this->headers[] = array($header, TRUE);
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Get Current Content-Type Header
- *
- * @return string 'text/html', if not already set
- */
- public function get_content_type()
- {
- for ($i = 0, $c = count($this->headers); $i < $c; $i++)
- {
- if (sscanf($this->headers[$i][0], 'Content-Type: %[^;]', $content_type) === 1)
- {
- return $content_type;
- }
- }
-
- return 'text/html';
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Get Header
- *
- * @param string $header_name
- * @return string
- */
- public function get_header($header)
- {
- // Combine headers already sent with our batched headers
- $headers = array_merge(
- // We only need [x][0] from our multi-dimensional array
- array_map('array_shift', $this->headers),
- headers_list()
- );
-
- if (empty($headers) OR empty($header))
- {
- return NULL;
- }
-
- for ($i = 0, $c = count($headers); $i < $c; $i++)
- {
- if (strncasecmp($header, $headers[$i], $l = strlen($header)) === 0)
- {
- return trim(substr($headers[$i], $l+1));
- }
- }
-
- return NULL;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set HTTP Status Header
- *
- * As of version 1.7.2, this is an alias for common function
- * set_status_header().
- *
- * @param int $code Status code (default: 200)
- * @param string $text Optional message
- * @return CI_Output
- */
- public function set_status_header($code = 200, $text = '')
- {
- set_status_header($code, $text);
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Enable/disable Profiler
- *
- * @param bool $val TRUE to enable or FALSE to disable
- * @return CI_Output
- */
- public function enable_profiler($val = TRUE)
- {
- $this->enable_profiler = is_bool($val) ? $val : TRUE;
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set Profiler Sections
- *
- * Allows override of default/config settings for
- * Profiler section display.
- *
- * @param array $sections Profiler sections
- * @return CI_Output
- */
- public function set_profiler_sections($sections)
- {
- if (isset($sections['query_toggle_count']))
- {
- $this->_profiler_sections['query_toggle_count'] = (int) $sections['query_toggle_count'];
- unset($sections['query_toggle_count']);
- }
-
- foreach ($sections as $section => $enable)
- {
- $this->_profiler_sections[$section] = ($enable !== FALSE);
- }
-
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set Cache
- *
- * @param int $time Cache expiration time in seconds
- * @return CI_Output
- */
- public function cache($time)
- {
- $this->cache_expiration = is_numeric($time) ? $time : 0;
- return $this;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Display Output
- *
- * Processes sends the sends finalized output data to the browser along
- * with any server headers and profile data. It also stops benchmark
- * timers so the page rendering speed and memory usage can be shown.
- *
- * Note: All "view" data is automatically put into $this->final_output
- * by controller class.
- *
- * @uses CI_Output::$final_output
- * @param string $output Output data override
- * @return void
- */
- public function _display($output = '')
- {
- // Note: We use globals because we can't use $CI =& get_instance()
- // since this function is sometimes called by the caching mechanism,
- // which happens before the CI super object is available.
- global $BM, $CFG;
-
- // Grab the super object if we can.
- if (class_exists('CI_Controller'))
- {
- $CI =& get_instance();
- }
-
- // --------------------------------------------------------------------
-
- // Set the output data
- if ($output === '')
- {
- $output =& $this->final_output;
- }
-
- // --------------------------------------------------------------------
-
- // Is minify requested?
- if ($CFG->item('minify_output') === TRUE)
- {
- $output = $this->minify($output, $this->mime_type);
- }
-
- // --------------------------------------------------------------------
-
- // Do we need to write a cache file? Only if the controller does not have its
- // own _output() method and we are not dealing with a cache file, which we
- // can determine by the existence of the $CI object above
- if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))
- {
- $this->_write_cache($output);
- }
-
- // --------------------------------------------------------------------
-
- // Parse out the elapsed time and memory usage,
- // then swap the pseudo-variables with the data
-
- $elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');
-
- if ($this->parse_exec_vars === TRUE)
- {
- $memory = round(memory_get_usage() / 1024 / 1024, 2).'MB';
-
- $output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output);
- }
-
- // --------------------------------------------------------------------
-
- // Is compression requested?
- if ($CFG->item('compress_output') === TRUE && $this->_zlib_oc === FALSE
- && extension_loaded('zlib')
- && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
- {
- ob_start('ob_gzhandler');
- }
-
- // --------------------------------------------------------------------
-
- // Are there any server headers to send?
- if (count($this->headers) > 0)
- {
- foreach ($this->headers as $header)
- {
- @header($header[0], $header[1]);
- }
- }
-
- // --------------------------------------------------------------------
-
- // Does the $CI object exist?
- // If not we know we are dealing with a cache file so we'll
- // simply echo out the data and exit.
- if ( ! isset($CI))
- {
- echo $output;
- log_message('debug', 'Final output sent to browser');
- log_message('debug', 'Total execution time: '.$elapsed);
- return;
- }
-
- // --------------------------------------------------------------------
-
- // Do we need to generate profile data?
- // If so, load the Profile class and run it.
- if ($this->enable_profiler === TRUE)
- {
- $CI->load->library('profiler');
- if ( ! empty($this->_profiler_sections))
- {
- $CI->profiler->set_sections($this->_profiler_sections);
- }
-
- // If the output data contains closing </body> and </html> tags
- // we will remove them and add them back after we insert the profile data
- $output = preg_replace('|</body>.*?</html>|is', '', $output, -1, $count).$CI->profiler->run();
- if ($count > 0)
- {
- $output .= '</body></html>';
- }
- }
-
- // Does the controller contain a function named _output()?
- // If so send the output there. Otherwise, echo it.
- if (method_exists($CI, '_output'))
- {
- $CI->_output($output);
- }
- else
- {
- echo $output; // Send it to the browser!
- }
-
- log_message('debug', 'Final output sent to browser');
- log_message('debug', 'Total execution time: '.$elapsed);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Write Cache
- *
- * @param string $output Output data to cache
- * @return void
- */
- public function _write_cache($output)
- {
- $CI =& get_instance();
- $path = $CI->config->item('cache_path');
- $cache_path = ($path === '') ? APPPATH.'cache/' : $path;
-
- if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
- {
- log_message('error', 'Unable to write cache file: '.$cache_path);
- return;
- }
-
- $uri = $CI->config->item('base_url').
- $CI->config->item('index_page').
- $CI->uri->uri_string();
-
- $cache_path .= md5($uri);
-
- if ( ! $fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE))
- {
- log_message('error', 'Unable to write cache file: '.$cache_path);
- return;
- }
-
- $expire = time() + ($this->cache_expiration * 60);
-
- if (flock($fp, LOCK_EX))
- {
- fwrite($fp, $expire.'TS--->'.$output);
- flock($fp, LOCK_UN);
- }
- else
- {
- log_message('error', 'Unable to secure a file lock for file at: '.$cache_path);
- return;
- }
- fclose($fp);
- @chmod($cache_path, FILE_WRITE_MODE);
-
- log_message('debug', 'Cache file written: '.$cache_path);
-
- // Send HTTP cache-control headers to browser to match file cache settings.
- $this->set_cache_header($_SERVER['REQUEST_TIME'], $expire);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Update/serve cached output
- *
- * @uses CI_Config
- * @uses CI_URI
- *
- * @param object &$CFG CI_Config class instance
- * @param object &$URI CI_URI class instance
- * @return bool TRUE on success or FALSE on failure
- */
- public function _display_cache(&$CFG, &$URI)
- {
- $cache_path = ($CFG->item('cache_path') === '') ? APPPATH.'cache/' : $CFG->item('cache_path');
-
- // Build the file path. The file name is an MD5 hash of the full URI
- $uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string;
- $filepath = $cache_path.md5($uri);
-
- if ( ! @file_exists($filepath) OR ! $fp = @fopen($filepath, FOPEN_READ))
- {
- return FALSE;
- }
-
- flock($fp, LOCK_SH);
-
- $cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : '';
-
- flock($fp, LOCK_UN);
- fclose($fp);
-
- // Strip out the embedded timestamp
- if ( ! preg_match('/^(\d+)TS--->/', $cache, $match))
- {
- return FALSE;
- }
-
- $last_modified = filemtime($cache_path);
- $expire = $match[1];
-
- // Has the file expired?
- if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))
- {
- // If so we'll delete it.
- @unlink($filepath);
- log_message('debug', 'Cache file has expired. File deleted.');
- return FALSE;
- }
- else
- {
- // Or else send the HTTP cache control headers.
- $this->set_cache_header($last_modified, $expire);
- }
-
- // Display the cache
- $this->_display(substr($cache, strlen($match[0])));
- log_message('debug', 'Cache file is current. Sending it to browser.');
- return TRUE;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Delete cache
- *
- * @param string $uri URI string
- * @return bool
- */
- public function delete_cache($uri = '')
- {
- $CI =& get_instance();
- $cache_path = $CI->config->item('cache_path');
- if ($cache_path === '')
- {
- $cache_path = APPPATH.'cache/';
- }
-
- if ( ! is_dir($cache_path))
- {
- log_message('error', 'Unable to find cache path: '.$cache_path);
- return FALSE;
- }
-
- if (empty($uri))
- {
- $uri = $CI->uri->uri_string();
- }
-
- $cache_path .= md5($CI->config->item('base_url').$CI->config->item('index_page').$uri);
-
- if ( ! @unlink($cache_path))
- {
- log_message('error', 'Unable to delete cache file for '.$uri);
- return FALSE;
- }
-
- return TRUE;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Set Cache Header
- *
- * Set the HTTP headers to match the server-side file cache settings
- * in order to reduce bandwidth.
- *
- * @param int $last_modified Timestamp of when the page was last modified
- * @param int $expiration Timestamp of when should the requested page expire from cache
- * @return void
- */
- public function set_cache_header($last_modified, $expiration)
- {
- $max_age = $expiration - $_SERVER['REQUEST_TIME'];
-
- if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))
- {
- $this->set_status_header(304);
- exit;
- }
- else
- {
- header('Pragma: public');
- header('Cache-Control: max-age=' . $max_age . ', public');
- header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');
- header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT');
- }
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Minify
- *
- * Reduce excessive size of HTML/CSS/JavaScript content.
- *
- * @param string $output Output to minify
- * @param string $type Output content MIME type
- * @return string Minified output
- */
- public function minify($output, $type = 'text/html')
- {
- switch ($type)
- {
- case 'text/html':
-
- if (($size_before = strlen($output)) === 0)
- {
- return '';
- }
-
- // Find all the <pre>,<code>,<textarea>, and <javascript> tags
- // We'll want to return them to this unprocessed state later.
- preg_match_all('{<pre.+</pre>}msU', $output, $pres_clean);
- preg_match_all('{<code.+</code>}msU', $output, $codes_clean);
- preg_match_all('{<textarea.+</textarea>}msU', $output, $textareas_clean);
- preg_match_all('{<script.+</script>}msU', $output, $javascript_clean);
-
- // Minify the CSS in all the <style> tags.
- preg_match_all('{<style.+</style>}msU', $output, $style_clean);
- foreach ($style_clean[0] as $s)
- {
- $output = str_replace($s, $this->_minify_script_style($s, TRUE), $output);
- }
-
- // Minify the javascript in <script> tags.
- foreach ($javascript_clean[0] as $s)
- {
- $javascript_mini[] = $this->_minify_script_style($s, TRUE);
- }
-
- // Replace multiple spaces with a single space.
- $output = preg_replace('!\s{2,}!', ' ', $output);
-
- // Remove comments (non-MSIE conditionals)
- $output = preg_replace('{\s*<!--[^\[].*-->\s*}msU', '', $output);
-
- // Remove spaces around block-level elements.
- $output = preg_replace('/\s*(<\/?(html|head|title|meta|script|link|style|body|h[1-6]|div|p|br)[^>]*>)\s*/is', '$1', $output);
-
- // Replace mangled <pre> etc. tags with unprocessed ones.
-
- if ( ! empty($pres_clean))
- {
- preg_match_all('{<pre.+</pre>}msU', $output, $pres_messed);
- $output = str_replace($pres_messed[0], $pres_clean[0], $output);
- }
-
- if ( ! empty($codes_clean))
- {
- preg_match_all('{<code.+</code>}msU', $output, $codes_messed);
- $output = str_replace($codes_messed[0], $codes_clean[0], $output);
- }
-
- if ( ! empty($codes_clean))
- {
- preg_match_all('{<textarea.+</textarea>}msU', $output, $textareas_messed);
- $output = str_replace($textareas_messed[0], $textareas_clean[0], $output);
- }
-
- if (isset($javascript_mini))
- {
- preg_match_all('{<script.+</script>}msU', $output, $javascript_messed);
- $output = str_replace($javascript_messed[0], $javascript_mini, $output);
- }
-
- $size_removed = $size_before - strlen($output);
- $savings_percent = round(($size_removed / $size_before * 100));
-
- log_message('debug', 'Minifier shaved '.($size_removed / 1000).'KB ('.$savings_percent.'%) off final HTML output.');
-
- break;
-
- case 'text/css':
- case 'text/javascript':
-
- $output = $this->_minify_script_style($output);
-
- break;
-
- default: break;
- }
-
- return $output;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Minify Style and Script
- *
- * Reduce excessive size of CSS/JavaScript content. To remove spaces this
- * script walks the string as an array and determines if the pointer is inside
- * a string created by single quotes or double quotes. spaces inside those
- * strings are not stripped. Opening and closing tags are severed from
- * the string initially and saved without stripping whitespace to preserve
- * the tags and any associated properties if tags are present
- *
- * Minification logic/workflow is similar to methods used by Douglas Crockford
- * in JSMIN. http://www.crockford.com/javascript/jsmin.html
- *
- * KNOWN ISSUE: ending a line with a closing parenthesis ')' and no semicolon
- * where there should be one will break the Javascript. New lines after a
- * closing parenthesis are not recognized by the script. For best results
- * be sure to terminate lines with a semicolon when appropriate.
- *
- * @param string $output Output to minify
- * @param bool $has_tags Specify if the output has style or script tags
- * @return string Minified output
- */
- protected function _minify_script_style($output, $has_tags = FALSE)
- {
- // We only need this if there are tags in the file
- if ($has_tags === TRUE)
- {
- // Remove opening tag and save for later
- $pos = strpos($output, '>') + 1;
- $open_tag = substr($output, 0, $pos);
- $output = substr_replace($output, '', 0, $pos);
-
- // Remove closing tag and save it for later
- $end_pos = strlen($output);
- $pos = strpos($output, '</');
- $closing_tag = substr($output, $pos, $end_pos);
- $output = substr_replace($output, '', $pos);
- }
-
- // Remove CSS comments
- $output = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!i', '', $output);
-
- // Remove spaces around curly brackets, colons,
- // semi-colons, parenthesis, commas
- $output = preg_replace('!\s*(:|;|,|}|{|\(|\))\s*!i', '$1', $output);
-
- // Replace tabs with spaces
- // Replace carriage returns & multiple new lines with single new line
- // and trim any leading or trailing whitespace
- $output = trim(preg_replace(array('/\t+/', '/\r/', '/\n+/'), array(' ', "\n", "\n"), $output));
-
- // Remove spaces when safe to do so.
- $in_string = $in_dstring = $prev = FALSE;
- $array_output = str_split($output);
- foreach ($array_output as $key => $value)
- {
- if ($in_string === FALSE && $in_dstring === FALSE)
- {
- if ($value === ' ')
- {
- // Get the next element in the array for comparisons
- $next = $array_output[$key + 1];
-
- // Strip spaces preceded/followed by a non-ASCII character
- // or not preceded/followed by an alphanumeric
- // or not preceded/followed \ $ and _
- if ((preg_match('/^[\x20-\x7f]*$/D', $next) OR preg_match('/^[\x20-\x7f]*$/D', $prev))
- && ( ! ctype_alnum($next) OR ! ctype_alnum($prev))
- && ! in_array($next, array('\\', '_', '$'), TRUE)
- && ! in_array($prev, array('\\', '_', '$'), TRUE)
- )
- {
- unset($array_output[$key]);
- }
- }
- else
- {
- // Save this value as previous for the next iteration
- // if it is not a blank space
- $prev = $value;
- }
- }
-
- if ($value === "'")
- {
- $in_string = ! $in_string;
- }
- elseif ($value === '"')
- {
- $in_dstring = ! $in_dstring;
- }
- }
-
- // Put the string back together after spaces have been stripped
- $output = implode($array_output);
-
- // Remove new line characters unless previous or next character is
- // printable or Non-ASCII
- preg_match_all('/[\n]/', $output, $lf, PREG_OFFSET_CAPTURE);
- $removed_lf = 0;
- foreach ($lf as $feed_position)
- {
- foreach ($feed_position as $position)
- {
- $position = $position[1] - $removed_lf;
- $next = $output[$position + 1];
- $prev = $output[$position - 1];
- if ( ! ctype_print($next) && ! ctype_print($prev)
- && ! preg_match('/^[\x20-\x7f]*$/D', $next)
- && ! preg_match('/^[\x20-\x7f]*$/D', $prev)
- )
- {
- $output = substr_replace($output, '', $position, 1);
- $removed_lf++;
- }
- }
- }
-
- // Put the opening and closing tags back if applicable
- return isset($open_tag)
- ? $open_tag.$output.$closing_tag
- : $output;
- }
-
-}
-
-/* End of file Output.php */
+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.2.4 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst. It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package CodeIgniter
+ * @author EllisLab Dev Team
+ * @copyright Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
+ * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link http://codeigniter.com
+ * @since Version 1.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * Output Class
+ *
+ * Responsible for sending final output to the browser.
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Output
+ * @author EllisLab Dev Team
+ * @link http://codeigniter.com/user_guide/libraries/output.html
+ */
+class CI_Output {
+
+ /**
+ * Final output string
+ *
+ * @var string
+ */
+ public $final_output;
+
+ /**
+ * Cache expiration time
+ *
+ * @var int
+ */
+ public $cache_expiration = 0;
+
+ /**
+ * List of server headers
+ *
+ * @var array
+ */
+ public $headers = array();
+
+ /**
+ * List of mime types
+ *
+ * @var array
+ */
+ public $mimes = array();
+
+ /**
+ * Mime-type for the current page
+ *
+ * @var string
+ */
+ protected $mime_type = 'text/html';
+
+ /**
+ * Enable Profiler flag
+ *
+ * @var bool
+ */
+ public $enable_profiler = FALSE;
+
+ /**
+ * zLib output compression flag
+ *
+ * @var bool
+ */
+ protected $_zlib_oc = FALSE;
+
+ /**
+ * List of profiler sections
+ *
+ * @var array
+ */
+ protected $_profiler_sections = array();
+
+ /**
+ * Parse markers flag
+ *
+ * Whether or not to parse variables like {elapsed_time} and {memory_usage}.
+ *
+ * @var bool
+ */
+ public $parse_exec_vars = TRUE;
+
+ /**
+ * Class constructor
+ *
+ * Determines whether zLib output compression will be used.
+ *
+ * @return void
+ */
+ public function __construct()
+ {
+ $this->_zlib_oc = (bool) @ini_get('zlib.output_compression');
+
+ // Get mime types for later
+ $this->mimes =& get_mimes();
+
+ log_message('debug', 'Output Class Initialized');
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Get Output
+ *
+ * Returns the current output string.
+ *
+ * @return string
+ */
+ public function get_output()
+ {
+ return $this->final_output;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Output
+ *
+ * Sets the output string.
+ *
+ * @param string $output Output data
+ * @return CI_Output
+ */
+ public function set_output($output)
+ {
+ $this->final_output = $output;
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Append Output
+ *
+ * Appends data onto the output string.
+ *
+ * @param string $output Data to append
+ * @return CI_Output
+ */
+ public function append_output($output)
+ {
+ if (empty($this->final_output))
+ {
+ $this->final_output = $output;
+ }
+ else
+ {
+ $this->final_output .= $output;
+ }
+
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Header
+ *
+ * Lets you set a server header which will be sent with the final output.
+ *
+ * Note: If a file is cached, headers will not be sent.
+ * @todo We need to figure out how to permit headers to be cached.
+ *
+ * @param string $header Header
+ * @param bool $replace Whether to replace the old header value, if already set
+ * @return CI_Output
+ */
+ public function set_header($header, $replace = TRUE)
+ {
+ // If zlib.output_compression is enabled it will compress the output,
+ // but it will not modify the content-length header to compensate for
+ // the reduction, causing the browser to hang waiting for more data.
+ // We'll just skip content-length in those cases.
+ if ($this->_zlib_oc && strncasecmp($header, 'content-length', 14) === 0)
+ {
+ return $this;
+ }
+
+ $this->headers[] = array($header, $replace);
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Content-Type Header
+ *
+ * @param string $mime_type Extension of the file we're outputting
+ * @param string $charset Character set (default: NULL)
+ * @return CI_Output
+ */
+ public function set_content_type($mime_type, $charset = NULL)
+ {
+ if (strpos($mime_type, '/') === FALSE)
+ {
+ $extension = ltrim($mime_type, '.');
+
+ // Is this extension supported?
+ if (isset($this->mimes[$extension]))
+ {
+ $mime_type =& $this->mimes[$extension];
+
+ if (is_array($mime_type))
+ {
+ $mime_type = current($mime_type);
+ }
+ }
+ }
+
+ $this->mime_type = $mime_type;
+
+ if (empty($charset))
+ {
+ $charset = config_item('charset');
+ }
+
+ $header = 'Content-Type: '.$mime_type
+ .(empty($charset) ? NULL : '; charset='.$charset);
+
+ $this->headers[] = array($header, TRUE);
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Get Current Content-Type Header
+ *
+ * @return string 'text/html', if not already set
+ */
+ public function get_content_type()
+ {
+ for ($i = 0, $c = count($this->headers); $i < $c; $i++)
+ {
+ if (sscanf($this->headers[$i][0], 'Content-Type: %[^;]', $content_type) === 1)
+ {
+ return $content_type;
+ }
+ }
+
+ return 'text/html';
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Get Header
+ *
+ * @param string $header_name
+ * @return string
+ */
+ public function get_header($header)
+ {
+ // Combine headers already sent with our batched headers
+ $headers = array_merge(
+ // We only need [x][0] from our multi-dimensional array
+ array_map('array_shift', $this->headers),
+ headers_list()
+ );
+
+ if (empty($headers) OR empty($header))
+ {
+ return NULL;
+ }
+
+ for ($i = 0, $c = count($headers); $i < $c; $i++)
+ {
+ if (strncasecmp($header, $headers[$i], $l = strlen($header)) === 0)
+ {
+ return trim(substr($headers[$i], $l+1));
+ }
+ }
+
+ return NULL;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set HTTP Status Header
+ *
+ * As of version 1.7.2, this is an alias for common function
+ * set_status_header().
+ *
+ * @param int $code Status code (default: 200)
+ * @param string $text Optional message
+ * @return CI_Output
+ */
+ public function set_status_header($code = 200, $text = '')
+ {
+ set_status_header($code, $text);
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Enable/disable Profiler
+ *
+ * @param bool $val TRUE to enable or FALSE to disable
+ * @return CI_Output
+ */
+ public function enable_profiler($val = TRUE)
+ {
+ $this->enable_profiler = is_bool($val) ? $val : TRUE;
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Profiler Sections
+ *
+ * Allows override of default/config settings for
+ * Profiler section display.
+ *
+ * @param array $sections Profiler sections
+ * @return CI_Output
+ */
+ public function set_profiler_sections($sections)
+ {
+ if (isset($sections['query_toggle_count']))
+ {
+ $this->_profiler_sections['query_toggle_count'] = (int) $sections['query_toggle_count'];
+ unset($sections['query_toggle_count']);
+ }
+
+ foreach ($sections as $section => $enable)
+ {
+ $this->_profiler_sections[$section] = ($enable !== FALSE);
+ }
+
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Cache
+ *
+ * @param int $time Cache expiration time in seconds
+ * @return CI_Output
+ */
+ public function cache($time)
+ {
+ $this->cache_expiration = is_numeric($time) ? $time : 0;
+ return $this;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Display Output
+ *
+ * Processes sends the sends finalized output data to the browser along
+ * with any server headers and profile data. It also stops benchmark
+ * timers so the page rendering speed and memory usage can be shown.
+ *
+ * Note: All "view" data is automatically put into $this->final_output
+ * by controller class.
+ *
+ * @uses CI_Output::$final_output
+ * @param string $output Output data override
+ * @return void
+ */
+ public function _display($output = '')
+ {
+ // Note: We use globals because we can't use $CI =& get_instance()
+ // since this function is sometimes called by the caching mechanism,
+ // which happens before the CI super object is available.
+ global $BM, $CFG;
+
+ // Grab the super object if we can.
+ if (class_exists('CI_Controller'))
+ {
+ $CI =& get_instance();
+ }
+
+ // --------------------------------------------------------------------
+
+ // Set the output data
+ if ($output === '')
+ {
+ $output =& $this->final_output;
+ }
+
+ // --------------------------------------------------------------------
+
+ // Is minify requested?
+ if ($CFG->item('minify_output') === TRUE)
+ {
+ $output = $this->minify($output, $this->mime_type);
+ }
+
+ // --------------------------------------------------------------------
+
+ // Do we need to write a cache file? Only if the controller does not have its
+ // own _output() method and we are not dealing with a cache file, which we
+ // can determine by the existence of the $CI object above
+ if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))
+ {
+ $this->_write_cache($output);
+ }
+
+ // --------------------------------------------------------------------
+
+ // Parse out the elapsed time and memory usage,
+ // then swap the pseudo-variables with the data
+
+ $elapsed = $BM->elapsed_time('total_execution_time_start', 'total_execution_time_end');
+
+ if ($this->parse_exec_vars === TRUE)
+ {
+ $memory = round(memory_get_usage() / 1024 / 1024, 2).'MB';
+
+ $output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output);
+ }
+
+ // --------------------------------------------------------------------
+
+ // Is compression requested?
+ if ($CFG->item('compress_output') === TRUE && $this->_zlib_oc === FALSE
+ && extension_loaded('zlib')
+ && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE)
+ {
+ ob_start('ob_gzhandler');
+ }
+
+ // --------------------------------------------------------------------
+
+ // Are there any server headers to send?
+ if (count($this->headers) > 0)
+ {
+ foreach ($this->headers as $header)
+ {
+ @header($header[0], $header[1]);
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ // Does the $CI object exist?
+ // If not we know we are dealing with a cache file so we'll
+ // simply echo out the data and exit.
+ if ( ! isset($CI))
+ {
+ echo $output;
+ log_message('debug', 'Final output sent to browser');
+ log_message('debug', 'Total execution time: '.$elapsed);
+ return;
+ }
+
+ // --------------------------------------------------------------------
+
+ // Do we need to generate profile data?
+ // If so, load the Profile class and run it.
+ if ($this->enable_profiler === TRUE)
+ {
+ $CI->load->library('profiler');
+ if ( ! empty($this->_profiler_sections))
+ {
+ $CI->profiler->set_sections($this->_profiler_sections);
+ }
+
+ // If the output data contains closing </body> and </html> tags
+ // we will remove them and add them back after we insert the profile data
+ $output = preg_replace('|</body>.*?</html>|is', '', $output, -1, $count).$CI->profiler->run();
+ if ($count > 0)
+ {
+ $output .= '</body></html>';
+ }
+ }
+
+ // Does the controller contain a function named _output()?
+ // If so send the output there. Otherwise, echo it.
+ if (method_exists($CI, '_output'))
+ {
+ $CI->_output($output);
+ }
+ else
+ {
+ echo $output; // Send it to the browser!
+ }
+
+ log_message('debug', 'Final output sent to browser');
+ log_message('debug', 'Total execution time: '.$elapsed);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Write Cache
+ *
+ * @param string $output Output data to cache
+ * @return void
+ */
+ public function _write_cache($output)
+ {
+ $CI =& get_instance();
+ $path = $CI->config->item('cache_path');
+ $cache_path = ($path === '') ? APPPATH.'cache/' : $path;
+
+ if ( ! is_dir($cache_path) OR ! is_really_writable($cache_path))
+ {
+ log_message('error', 'Unable to write cache file: '.$cache_path);
+ return;
+ }
+
+ $uri = $CI->config->item('base_url').
+ $CI->config->item('index_page').
+ $CI->uri->uri_string();
+
+ $cache_path .= md5($uri);
+
+ if ( ! $fp = @fopen($cache_path, FOPEN_WRITE_CREATE_DESTRUCTIVE))
+ {
+ log_message('error', 'Unable to write cache file: '.$cache_path);
+ return;
+ }
+
+ $expire = time() + ($this->cache_expiration * 60);
+
+ if (flock($fp, LOCK_EX))
+ {
+ fwrite($fp, $expire.'TS--->'.$output);
+ flock($fp, LOCK_UN);
+ }
+ else
+ {
+ log_message('error', 'Unable to secure a file lock for file at: '.$cache_path);
+ return;
+ }
+ fclose($fp);
+ @chmod($cache_path, FILE_WRITE_MODE);
+
+ log_message('debug', 'Cache file written: '.$cache_path);
+
+ // Send HTTP cache-control headers to browser to match file cache settings.
+ $this->set_cache_header($_SERVER['REQUEST_TIME'], $expire);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Update/serve cached output
+ *
+ * @uses CI_Config
+ * @uses CI_URI
+ *
+ * @param object &$CFG CI_Config class instance
+ * @param object &$URI CI_URI class instance
+ * @return bool TRUE on success or FALSE on failure
+ */
+ public function _display_cache(&$CFG, &$URI)
+ {
+ $cache_path = ($CFG->item('cache_path') === '') ? APPPATH.'cache/' : $CFG->item('cache_path');
+
+ // Build the file path. The file name is an MD5 hash of the full URI
+ $uri = $CFG->item('base_url').$CFG->item('index_page').$URI->uri_string;
+ $filepath = $cache_path.md5($uri);
+
+ if ( ! @file_exists($filepath) OR ! $fp = @fopen($filepath, FOPEN_READ))
+ {
+ return FALSE;
+ }
+
+ flock($fp, LOCK_SH);
+
+ $cache = (filesize($filepath) > 0) ? fread($fp, filesize($filepath)) : '';
+
+ flock($fp, LOCK_UN);
+ fclose($fp);
+
+ // Strip out the embedded timestamp
+ if ( ! preg_match('/^(\d+)TS--->/', $cache, $match))
+ {
+ return FALSE;
+ }
+
+ $last_modified = filemtime($cache_path);
+ $expire = $match[1];
+
+ // Has the file expired?
+ if ($_SERVER['REQUEST_TIME'] >= $expire && is_really_writable($cache_path))
+ {
+ // If so we'll delete it.
+ @unlink($filepath);
+ log_message('debug', 'Cache file has expired. File deleted.');
+ return FALSE;
+ }
+ else
+ {
+ // Or else send the HTTP cache control headers.
+ $this->set_cache_header($last_modified, $expire);
+ }
+
+ // Display the cache
+ $this->_display(substr($cache, strlen($match[0])));
+ log_message('debug', 'Cache file is current. Sending it to browser.');
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Delete cache
+ *
+ * @param string $uri URI string
+ * @return bool
+ */
+ public function delete_cache($uri = '')
+ {
+ $CI =& get_instance();
+ $cache_path = $CI->config->item('cache_path');
+ if ($cache_path === '')
+ {
+ $cache_path = APPPATH.'cache/';
+ }
+
+ if ( ! is_dir($cache_path))
+ {
+ log_message('error', 'Unable to find cache path: '.$cache_path);
+ return FALSE;
+ }
+
+ if (empty($uri))
+ {
+ $uri = $CI->uri->uri_string();
+ }
+
+ $cache_path .= md5($CI->config->item('base_url').$CI->config->item('index_page').$uri);
+
+ if ( ! @unlink($cache_path))
+ {
+ log_message('error', 'Unable to delete cache file for '.$uri);
+ return FALSE;
+ }
+
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Cache Header
+ *
+ * Set the HTTP headers to match the server-side file cache settings
+ * in order to reduce bandwidth.
+ *
+ * @param int $last_modified Timestamp of when the page was last modified
+ * @param int $expiration Timestamp of when should the requested page expire from cache
+ * @return void
+ */
+ public function set_cache_header($last_modified, $expiration)
+ {
+ $max_age = $expiration - $_SERVER['REQUEST_TIME'];
+
+ if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $last_modified <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']))
+ {
+ $this->set_status_header(304);
+ exit;
+ }
+ else
+ {
+ header('Pragma: public');
+ header('Cache-Control: max-age=' . $max_age . ', public');
+ header('Expires: '.gmdate('D, d M Y H:i:s', $expiration).' GMT');
+ header('Last-modified: '.gmdate('D, d M Y H:i:s', $last_modified).' GMT');
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Minify
+ *
+ * Reduce excessive size of HTML/CSS/JavaScript content.
+ *
+ * @param string $output Output to minify
+ * @param string $type Output content MIME type
+ * @return string Minified output
+ */
+ public function minify($output, $type = 'text/html')
+ {
+ switch ($type)
+ {
+ case 'text/html':
+
+ if (($size_before = strlen($output)) === 0)
+ {
+ return '';
+ }
+
+ // Find all the <pre>,<code>,<textarea>, and <javascript> tags
+ // We'll want to return them to this unprocessed state later.
+ preg_match_all('{<pre.+</pre>}msU', $output, $pres_clean);
+ preg_match_all('{<code.+</code>}msU', $output, $codes_clean);
+ preg_match_all('{<textarea.+</textarea>}msU', $output, $textareas_clean);
+ preg_match_all('{<script.+</script>}msU', $output, $javascript_clean);
+
+ // Minify the CSS in all the <style> tags.
+ preg_match_all('{<style.+</style>}msU', $output, $style_clean);
+ foreach ($style_clean[0] as $s)
+ {
+ $output = str_replace($s, $this->_minify_script_style($s, TRUE), $output);
+ }
+
+ // Minify the javascript in <script> tags.
+ foreach ($javascript_clean[0] as $s)
+ {
+ $javascript_mini[] = $this->_minify_script_style($s, TRUE);
+ }
+
+ // Replace multiple spaces with a single space.
+ $output = preg_replace('!\s{2,}!', ' ', $output);
+
+ // Remove comments (non-MSIE conditionals)
+ $output = preg_replace('{\s*<!--[^\[<>].*(?<!!)-->\s*}msU', '', $output);
+
+ // Remove spaces around block-level elements.
+ $output = preg_replace('/\s*(<\/?(html|head|title|meta|script|link|style|body|h[1-6]|div|p|br)[^>]*>)\s*/is', '$1', $output);
+
+ // Replace mangled <pre> etc. tags with unprocessed ones.
+
+ if ( ! empty($pres_clean))
+ {
+ preg_match_all('{<pre.+</pre>}msU', $output, $pres_messed);
+ $output = str_replace($pres_messed[0], $pres_clean[0], $output);
+ }
+
+ if ( ! empty($codes_clean))
+ {
+ preg_match_all('{<code.+</code>}msU', $output, $codes_messed);
+ $output = str_replace($codes_messed[0], $codes_clean[0], $output);
+ }
+
+ if ( ! empty($codes_clean))
+ {
+ preg_match_all('{<textarea.+</textarea>}msU', $output, $textareas_messed);
+ $output = str_replace($textareas_messed[0], $textareas_clean[0], $output);
+ }
+
+ if (isset($javascript_mini))
+ {
+ preg_match_all('{<script.+</script>}msU', $output, $javascript_messed);
+ $output = str_replace($javascript_messed[0], $javascript_mini, $output);
+ }
+
+ $size_removed = $size_before - strlen($output);
+ $savings_percent = round(($size_removed / $size_before * 100));
+
+ log_message('debug', 'Minifier shaved '.($size_removed / 1000).'KB ('.$savings_percent.'%) off final HTML output.');
+
+ break;
+
+ case 'text/css':
+ case 'text/javascript':
+
+ $output = $this->_minify_script_style($output);
+
+ break;
+
+ default: break;
+ }
+
+ return $output;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Minify Style and Script
+ *
+ * Reduce excessive size of CSS/JavaScript content. To remove spaces this
+ * script walks the string as an array and determines if the pointer is inside
+ * a string created by single quotes or double quotes. spaces inside those
+ * strings are not stripped. Opening and closing tags are severed from
+ * the string initially and saved without stripping whitespace to preserve
+ * the tags and any associated properties if tags are present
+ *
+ * Minification logic/workflow is similar to methods used by Douglas Crockford
+ * in JSMIN. http://www.crockford.com/javascript/jsmin.html
+ *
+ * KNOWN ISSUE: ending a line with a closing parenthesis ')' and no semicolon
+ * where there should be one will break the Javascript. New lines after a
+ * closing parenthesis are not recognized by the script. For best results
+ * be sure to terminate lines with a semicolon when appropriate.
+ *
+ * @param string $output Output to minify
+ * @param bool $has_tags Specify if the output has style or script tags
+ * @return string Minified output
+ */
+ protected function _minify_script_style($output, $has_tags = FALSE)
+ {
+ // We only need this if there are tags in the file
+ if ($has_tags === TRUE)
+ {
+ // Remove opening tag and save for later
+ $pos = strpos($output, '>') + 1;
+ $open_tag = substr($output, 0, $pos);
+ $output = substr_replace($output, '', 0, $pos);
+
+ // Remove closing tag and save it for later
+ $end_pos = strlen($output);
+ $pos = strpos($output, '</');
+ $closing_tag = substr($output, $pos, $end_pos);
+ $output = substr_replace($output, '', $pos);
+ }
+
+ // Remove CSS comments
+ $output = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!i', '', $output);
+
+ // Remove spaces around curly brackets, colons,
+ // semi-colons, parenthesis, commas
+ $output = preg_replace('!\s*(:|;|,|}|{|\(|\))\s*!i', '$1', $output);
+
+ // Replace tabs with spaces
+ // Replace carriage returns & multiple new lines with single new line
+ // and trim any leading or trailing whitespace
+ $output = trim(preg_replace(array('/\t+/', '/\r/', '/\n+/'), array(' ', "\n", "\n"), $output));
+
+ // Remove spaces when safe to do so.
+ $in_string = $in_dstring = $prev = FALSE;
+ $array_output = str_split($output);
+ foreach ($array_output as $key => $value)
+ {
+ if ($in_string === FALSE && $in_dstring === FALSE)
+ {
+ if ($value === ' ')
+ {
+ // Get the next element in the array for comparisons
+ $next = $array_output[$key + 1];
+
+ // Strip spaces preceded/followed by a non-ASCII character
+ // or not preceded/followed by an alphanumeric
+ // or not preceded/followed \ $ and _
+ if ((preg_match('/^[\x20-\x7f]*$/D', $next) OR preg_match('/^[\x20-\x7f]*$/D', $prev))
+ && ( ! ctype_alnum($next) OR ! ctype_alnum($prev))
+ && ! in_array($next, array('\\', '_', '$'), TRUE)
+ && ! in_array($prev, array('\\', '_', '$'), TRUE)
+ )
+ {
+ unset($array_output[$key]);
+ }
+ }
+ else
+ {
+ // Save this value as previous for the next iteration
+ // if it is not a blank space
+ $prev = $value;
+ }
+ }
+
+ if ($value === "'")
+ {
+ $in_string = ! $in_string;
+ }
+ elseif ($value === '"')
+ {
+ $in_dstring = ! $in_dstring;
+ }
+ }
+
+ // Put the string back together after spaces have been stripped
+ $output = implode($array_output);
+
+ // Remove new line characters unless previous or next character is
+ // printable or Non-ASCII
+ preg_match_all('/[\n]/', $output, $lf, PREG_OFFSET_CAPTURE);
+ $removed_lf = 0;
+ foreach ($lf as $feed_position)
+ {
+ foreach ($feed_position as $position)
+ {
+ $position = $position[1] - $removed_lf;
+ $next = $output[$position + 1];
+ $prev = $output[$position - 1];
+ if ( ! ctype_print($next) && ! ctype_print($prev)
+ && ! preg_match('/^[\x20-\x7f]*$/D', $next)
+ && ! preg_match('/^[\x20-\x7f]*$/D', $prev)
+ )
+ {
+ $output = substr_replace($output, '', $position, 1);
+ $removed_lf++;
+ }
+ }
+ }
+
+ // Put the opening and closing tags back if applicable
+ return isset($open_tag)
+ ? $open_tag.$output.$closing_tag
+ : $output;
+ }
+
+}
+
+/* End of file Output.php */
/* Location: ./system/core/Output.php */
\ No newline at end of file