system/libraries/Typography.php - code-igniter-v3-giggi - Gitiles

 <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
  * An open source application development framework for PHP 4.3.2 or newer
  *
  * @package		CodeIgniter
  * @author		ExpressionEngine Dev Team
  * @copyright	Copyright (c) 2006, EllisLab, Inc.
  * @license		http://codeigniter.com/user_guide/license.html
  * @link		http://codeigniter.com
  * @since		Version 1.0
  * @filesource
  */

 // ------------------------------------------------------------------------

 /**
  * Typography Class
  *
  *
  * @access		private
  * @category	Helpers
  * @author		ExpressionEngine Dev Team
  * @link		http://codeigniter.com/user_guide/helpers/
  */
 class CI_Typography {

 	// Block level elements that should not be wrapped inside <p> tags
 	var $block_elements = 'div|blockquote|pre|code|h\d|script|ol|ul';

 	// Elements that should not have <p> and <br /> tags within them.
 	var $skip_elements	= 'pre|ol|ul';

 	// Tags we want the parser to completely ignore when splitting the string.
 	var $ignore_elements = 'a|b|i|em|strong|span|img|li';

 	// Whether to allow Javascript event handlers to be sumitted inside tags
 	var $allow_js_event_handlers = FALSE;

 	/**
 	 * Main Processing Function
 	 *
 	 */
 	function convert($str)
 	{
 		if ($str == '')
 		{
 			return '';
 		}

 		$str = ' '.$str.' ';

 		// Standardize Newlines to make matching easier
 		if (strpos($str, "\r") !== FALSE)
 		{
 			$str = str_replace(array("\r\n", "\r"), "\n", $str);
 		}

 		/*
 		 * Reduce line breaks
 		 *
 		 * If there are more than two consecutive line
 		 * breaks we'll compress them down to a maximum
 		 * of two since there's no benefit to more.
 		 *
 		 */
 		$str = preg_replace("/\n\n+/", "\n\n", $str);

 		/*
 		 * Do we allow JavaScript event handlers?
 		 *
 		 * If not, we strip them from within all tags
 		 */
 		if ($this->allow_js_event_handlers == FALSE)
 		{
 			$event_handlers = array('[^a-z_\-]on\w*','xmlns');
 			$str = preg_replace("#<([^><]+?)(".implode('|', $event_handlers).")(\s*=\s*[^><]*)([><]*)#i", "<\\1\\4", $str);
  		}

 		/*
 		 * Convert quotes within tags to temporary marker
 		 *
 		 * We don't want quotes converted within
 		 * tags so we'll temporarily convert them to
 		 * {@DQ} and {@SQ}
 		 *
 		 */
 		if (preg_match_all("#\<.+?>#si", $str, $matches))
 		{
 			for ($i = 0; $i < count($matches['0']); $i++)
 			{
 				$str = str_replace($matches['0'][$i],
 									str_replace(array("'",'"'), array('{@SQ}', '{@DQ}'), $matches['0'][$i]),
 									$str);
 			}
 		}

         /*
 		 * Add closing/opening paragraph tags before/after "block" elements
 		 *
 		 * Since block elements (like <blockquotes>, <pre>, etc.) do not get
 		 * wrapped in paragraph tags we will add a closing </p> tag just before
 		 * each block element starts and an opening <p> tag right after the block element
 		 * ends.  Later on we'll do some further clean up.
 		 *
 		 */
 		$str = preg_replace("#(<)(".$this->block_elements.")(.*?>)#", "</p>\\1\\2\\3", $str);
 		$str = preg_replace("#(</)(".$this->block_elements.")(.*?>)#", "\\1\\2\\3<p>", $str);

 		/*
 		 * Convert "ignore" tags to temporary marker
 		 *
 		 * The parser splits out the string at every tag
 		 * it encounters.  Certain inline tags, like image
 		 * tags, links, span tags, etc. will be adversely
 		 * affected if they are split out so we'll convert
 		 * the opening < temporarily to: {@TAG}
 		 *
 		 */
 		$str = preg_replace("#<(/*)(".$this->ignore_elements.")#i", "{@TAG}\\1\\2", $str);

 		/*
 		 * Split the string at every tag
 		 *
 		 * This creates an array with this prototype:
 		 *
 		 *	[array]
 		 *	{
 		 *		[0] = <opening tag>
 		 *		[1] = Content contained between the tags
 		 *		[2] = <closing tag>
 		 *		Etc...
 		 *	}
 		 *
 		 */
 		$chunks = preg_split('/(<(?:[^<>]+(?:"[^"]*"|\'[^\']*\')?)+>)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);

 		/*
 		 * Build our finalized string
 		 *
 		 * We'll cycle through the array, skipping tags,
 		 * and processing the contained text
 		 *
 		 */
 		$str = '';
 		$process = TRUE;
 		foreach ($chunks as $chunk)
 		{
 			/*
 			 * Are we dealing with a tag?
 			 *
 			 * If so, we'll skip the processing for this cycle.
 			 * Well also set the "process" flag which allows us
 			 * to skip <pre> tags and a few other things.
 			 *
 			 */
 			if (preg_match("#<(/*)(".$this->block_elements.").*?\>#", $chunk, $match))
 			{
 				if (preg_match("#".$this->skip_elements."#", $match['2']))
 				{
 					$process =  ($match['1'] == '/') ? TRUE : FALSE;
 				}

 				$str .= $chunk;
 				continue;
 			}

 			if ($process == FALSE)
 			{
 				$str .= $chunk;
 				continue;
 			}

 			//  Convert Newlines into <p> and <br /> tags
 			$str .= $this->format_newlines($chunk);
 		}

 		// FINAL CLEAN UP
 		// IMPORTANT:  DO NOT ALTER THE ORDER OF THE ITEMS BELOW!

 		/*
 		 * Clean up paragraph tags before/after "block" elements
 		 *
 		 * Earlier we added <p></p> tags before/after block level elements.
 		 * Then, we added paragraph tags around double line breaks.  This
 		 * potentially created incorrectly formatted paragraphs so we'll
 		 * clean it up here.
 		 *
 		 */
 		$str = preg_replace("#<p>({@TAG}.*?)(".$this->block_elements.")(.*?>)#", "\\1\\2\\3", $str);
 		$str = preg_replace("#({@TAG}/.*?)(".$this->block_elements.")(.*?>)</p>#", "\\1\\2\\3", $str);

 		// Convert Quotes and other characters
 		$str = $this->format_characters($str);

 		// Fix an artifact that happens during the paragraph replacement
 		$str = preg_replace('#(<p>\n*</p>)#', '', $str);

 		// If the user submitted their own paragraph tags with class data
 		// in them we will retain them instead of using our tags.
 		$str = preg_replace('#(<p.*?>)<p>#', "\\1", $str);  // <?php BBEdit syntax coloring fix

 		// Final clean up
 		$str = str_replace(
 							array(
 									'</p></p>',
 									'</p><p>',
 									'<p> ',
 									' </p>',
 									'{@TAG}',
 									'{@DQ}',
 									'{@SQ}',
 									'<p></p>'
 								),
 							array(
 									'</p>',
 									'<p>',
 									'<p>',
 									'</p>',
 									'<',
 									'"',
 									"'",
 									''
 								),
 							$str
 						);

 		return $str;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Format Characters
 	 *
 	 * This function mainly converts double and single quotes
 	 * to curly entities, but it also converts em-dashes,
 	 * double spaces, and ampersands
 	 */
 	function format_characters($str)
 	{
 		static $table;

 		if ( ! isset($table))
 		{
 	        $table = array(
 							// nested smart quotes, opening and closing
 							// note that rules for grammar (English) allow only for two levels deep
 							// and that single quotes are _supposed_ to always be on the outside
 							// but we'll accommodate both
 							'/(^|\W|\s)\'"/'				=> '$1&#8216;&#8220;',
 							'/\'"(\s|\W|$)/'				=> '&#8217;&#8221;$1',
 							'/(^|\W|\s)"\'/'				=> '$1&#8220;&#8216;',
 							'/"\'(\s|\W|$)/'				=> '&#8221;&#8217;$1',

 							// single quote smart quotes
 							'/\'(\s|\W|$)/'					=> '&#8217;$1',
 							'/(^|\W|\s)\'/'					=> '$1&#8216;',

 							// double quote smart quotes
 							'/"(\s|\W|$)/'					=> '&#8221;$1',
 							'/(^|\W|\s)"/'					=> '$1&#8220;',

 							// apostrophes
 							"/(\w)'(\w)/"       	    	=> '$1&#8217;$2',

 							// Em dash and ellipses dots
 							'/\s?\-\-\s?/'					=> '&#8212;',
 							'/\w\.{3}/'						=> '&#8230;',

 							// double space after sentences
 							'/(\W)\s{2}/'					=> '$1&nbsp; ',

 							// ampersands, if not a character entity
 							'/&(?!#?[a-zA-Z0-9]{2,};)/'		=> '&amp;'
 	        			);
 		}

 		return preg_replace(array_keys($table), $table, $str);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Format Newlines
 	 *
 	 * Converts newline characters into either <p> tags or <br />
 	 *
 	 */
 	function format_newlines($str)
 	{
 		if ($str == '')
 		{
 			return $str;
 		}

 		if (strpos($str, "\n") === FALSE)
 		{
 			return '<p>'.$str.'</p>';
 		}

 		$str = str_replace("\n\n", "</p>\n\n<p>", $str);
 		$str = preg_replace("/([^\n])(\n)([^\n])/", "\\1<br />\\2\\3", $str);

 		return '<p>'.$str.'</p>';
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Allow JavaScript Event Handlers?
 	 *
 	 * For security reasons, by default we disallow JS event handlers
 	 *
 	 */
 	function allow_js_event_handlers($val = FALSE)
 	{
 		$this->allow_js_event_handlers = ($val === FALSE) ? FALSE : TRUE;
 	}


 }
 // END Typography Class

 /* End of file Typography.php */
 /* Location: ./system/libraries/Typography.php */
	<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
	/**
	* CodeIgniter
	*
	* An open source application development framework for PHP 4.3.2 or newer
	*
	* @package CodeIgniter
	* @author ExpressionEngine Dev Team
	* @copyright Copyright (c) 2006, EllisLab, Inc.
	* @license http://codeigniter.com/user_guide/license.html
	* @link http://codeigniter.com
	* @since Version 1.0
	* @filesource
	*/

	// ------------------------------------------------------------------------

	/**
	* Typography Class
	*
	*
	* @access private
	* @category Helpers
	* @author ExpressionEngine Dev Team
	* @link http://codeigniter.com/user_guide/helpers/
	*/
	class CI_Typography {

	// Block level elements that should not be wrapped inside <p> tags
	var $block_elements = 'div\|blockquote\|pre\|code\|h\d\|script\|ol\|ul';

	// Elements that should not have <p> and <br /> tags within them.
	var $skip_elements = 'pre\|ol\|ul';

	// Tags we want the parser to completely ignore when splitting the string.
	var $ignore_elements = 'a\|b\|i\|em\|strong\|span\|img\|li';

	// Whether to allow Javascript event handlers to be sumitted inside tags
	var $allow_js_event_handlers = FALSE;

	/**
	* Main Processing Function
	*
	*/
	function convert($str)
	{
	if ($str == '')
	{
	return '';
	}

	$str = ' '.$str.' ';

	// Standardize Newlines to make matching easier
	if (strpos($str, "\r") !== FALSE)
	{
	$str = str_replace(array("\r\n", "\r"), "\n", $str);
	}

	/*
	* Reduce line breaks
	*
	* If there are more than two consecutive line
	* breaks we'll compress them down to a maximum
	* of two since there's no benefit to more.
	*
	*/
	$str = preg_replace("/\n\n+/", "\n\n", $str);

	/*
	* Do we allow JavaScript event handlers?
	*
	* If not, we strip them from within all tags
	*/
	if ($this->allow_js_event_handlers == FALSE)
	{
	$event_handlers = array('[^a-z_\-]on\w*','xmlns');
	$str = preg_replace("#<([^><]+?)(".implode('\|', $event_handlers).")(\s=\s[^><])([><])#i", "<\\1\\4", $str);
	}

	/*
	* Convert quotes within tags to temporary marker
	*
	* We don't want quotes converted within
	* tags so we'll temporarily convert them to
	* {@DQ} and {@SQ}
	*
	*/
	if (preg_match_all("#\<.+?>#si", $str, $matches))
	{
	for ($i = 0; $i < count($matches['0']); $i++)
	{
	$str = str_replace($matches['0'][$i],
	str_replace(array("'",'"'), array('{@SQ}', '{@DQ}'), $matches['0'][$i]),
	$str);
	}
	}

	/*
	* Add closing/opening paragraph tags before/after "block" elements
	*
	* Since block elements (like <blockquotes>, <pre>, etc.) do not get
	* wrapped in paragraph tags we will add a closing </p> tag just before
	* each block element starts and an opening <p> tag right after the block element
	* ends. Later on we'll do some further clean up.
	*
	*/
	$str = preg_replace("#(<)(".$this->block_elements.")(.*?>)#", "</p>\\1\\2\\3", $str);
	$str = preg_replace("#(</)(".$this->block_elements.")(.*?>)#", "\\1\\2\\3<p>", $str);

	/*
	* Convert "ignore" tags to temporary marker
	*
	* The parser splits out the string at every tag
	* it encounters. Certain inline tags, like image
	* tags, links, span tags, etc. will be adversely
	* affected if they are split out so we'll convert
	* the opening < temporarily to: {@TAG}
	*
	*/
	$str = preg_replace("#<(/*)(".$this->ignore_elements.")#i", "{@TAG}\\1\\2", $str);

	/*
	* Split the string at every tag
	*
	* This creates an array with this prototype:
	*
	* [array]
	* {
	* [0] = <opening tag>
	* [1] = Content contained between the tags
	* [2] = <closing tag>
	* Etc...
	* }
	*
	*/
	$chunks = preg_split('/(<(?:[^<>]+(?:"[^"]"\|\'[^\']\')?)+>)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE\|PREG_SPLIT_NO_EMPTY);

	/*
	* Build our finalized string
	*
	* We'll cycle through the array, skipping tags,
	* and processing the contained text
	*
	*/
	$str = '';
	$process = TRUE;
	foreach ($chunks as $chunk)
	{
	/*
	* Are we dealing with a tag?
	*
	* If so, we'll skip the processing for this cycle.
	* Well also set the "process" flag which allows us
	* to skip <pre> tags and a few other things.
	*
	*/
	if (preg_match("#<(/)(".$this->block_elements.").?\>#", $chunk, $match))
	{
	if (preg_match("#".$this->skip_elements."#", $match['2']))
	{
	$process = ($match['1'] == '/') ? TRUE : FALSE;
	}

	$str .= $chunk;
	continue;
	}

	if ($process == FALSE)
	{
	$str .= $chunk;
	continue;
	}

	// Convert Newlines into <p> and <br /> tags
	$str .= $this->format_newlines($chunk);
	}

	// FINAL CLEAN UP
	// IMPORTANT: DO NOT ALTER THE ORDER OF THE ITEMS BELOW!

	/*
	* Clean up paragraph tags before/after "block" elements
	*
	* Earlier we added <p></p> tags before/after block level elements.
	* Then, we added paragraph tags around double line breaks. This
	* potentially created incorrectly formatted paragraphs so we'll
	* clean it up here.
	*
	*/
	$str = preg_replace("#<p>({@TAG}.?)(".$this->block_elements.")(.?>)#", "\\1\\2\\3", $str);
	$str = preg_replace("#({@TAG}/.?)(".$this->block_elements.")(.?>)</p>#", "\\1\\2\\3", $str);

	// Convert Quotes and other characters
	$str = $this->format_characters($str);

	// Fix an artifact that happens during the paragraph replacement
	$str = preg_replace('#(<p>\n*</p>)#', '', $str);

	// If the user submitted their own paragraph tags with class data
	// in them we will retain them instead of using our tags.
	$str = preg_replace('#(<p.*?>)<p>#', "\\1", $str); // <?php BBEdit syntax coloring fix

	// Final clean up
	$str = str_replace(
	array(
	'</p></p>',
	'</p><p>',
	'<p> ',
	' </p>',
	'{@TAG}',
	'{@DQ}',
	'{@SQ}',
	'<p></p>'
	),
	array(
	'</p>',
	'<p>',
	'<p>',
	'</p>',
	'<',
	'"',
	"'",
	''
	),
	$str
	);

	return $str;
	}

	// --------------------------------------------------------------------

	/**
	* Format Characters
	*
	* This function mainly converts double and single quotes
	* to curly entities, but it also converts em-dashes,
	* double spaces, and ampersands
	*/
	function format_characters($str)
	{
	static $table;

	if ( ! isset($table))
	{
	$table = array(
	// nested smart quotes, opening and closing
	// note that rules for grammar (English) allow only for two levels deep
	// and that single quotes are _supposed_ to always be on the outside
	// but we'll accommodate both
	'/(^\|\W\|\s)\'"/' => '$1‘“',
	'/\'"(\s\|\W\|$)/' => '’”$1',
	'/(^\|\W\|\s)"\'/' => '$1“‘',
	'/"\'(\s\|\W\|$)/' => '”’$1',

	// single quote smart quotes
	'/\'(\s\|\W\|$)/' => '’$1',
	'/(^\|\W\|\s)\'/' => '$1‘',

	// double quote smart quotes
	'/"(\s\|\W\|$)/' => '”$1',
	'/(^\|\W\|\s)"/' => '$1“',

	// apostrophes
	"/(\w)'(\w)/" => '$1’$2',

	// Em dash and ellipses dots
	'/\s?\-\-\s?/' => '—',
	'/\w\.{3}/' => '…',

	// double space after sentences
	'/(\W)\s{2}/' => '$1  ',

	// ampersands, if not a character entity
	'/&(?!#?[a-zA-Z0-9]{2,};)/' => '&'
	);
	}

	return preg_replace(array_keys($table), $table, $str);
	}

	// --------------------------------------------------------------------

	/**
	* Format Newlines
	*
	* Converts newline characters into either <p> tags or <br />
	*
	*/
	function format_newlines($str)
	{
	if ($str == '')
	{
	return $str;
	}

	if (strpos($str, "\n") === FALSE)
	{
	return '<p>'.$str.'</p>';
	}

	$str = str_replace("\n\n", "</p>\n\n<p>", $str);
	$str = preg_replace("/([^\n])(\n)([^\n])/", "\\1<br />\\2\\3", $str);

	return '<p>'.$str.'</p>';
	}

	// --------------------------------------------------------------------

	/**
	* Allow JavaScript Event Handlers?
	*
	* For security reasons, by default we disallow JS event handlers
	*
	*/
	function allow_js_event_handlers($val = FALSE)
	{
	$this->allow_js_event_handlers = ($val === FALSE) ? FALSE : TRUE;
	}


	}
	// END Typography Class

	/* End of file Typography.php */
	/* Location: ./system/libraries/Typography.php */