<?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		Rick Ellis

 * @copyright	Copyright (c) 2006, EllisLab, Inc.

 * @license		http://www.codeignitor.com/user_guide/license.html

 * @link		http://www.codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



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



/**

 * CodeIgniter Typography Helpers

 *

 * @package		CodeIgniter

 * @subpackage	Helpers

 * @category	Helpers

 * @author		Rick Ellis

 * @link		http://www.codeigniter.com/user_guide/helpers/typography_helper.html

 */



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



/**

 * Convert newlines to HTML line breaks except within PRE tags

 *

 * @access	public

 * @param	string

 * @return	string

 */	

function nl2br_except_pre($str)

{

	$ex = explode("pre>",$str);

	$ct = count($ex);

	

	$newstr = "";

	for ($i = 0; $i < $ct; $i++)

	{

		if (($i % 2) == 0)

		{

			$newstr .= nl2br($ex[$i]);

		}

		else

		{

			$newstr .= $ex[$i];

		}

		

		if ($ct - 1 != $i)

			$newstr .= "pre>";

	}

	

	return $newstr;

}

	

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



/**

 * Auto Typography Wrapper Function

 *

 *

 * @access	public

 * @param	string

 * @return	string

 */

function auto_typography($str)

{

	$TYPE = new Auto_typography();

	return $TYPE->convert($str);

}

	

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



/**

 * Auto Typography Class

 *

 *

 * @access		private

 * @category	Helpers

 * @author		Rick Ellis

 * @author		Paul Burdick

 * @link		http://www.codeigniter.com/user_guide/helpers/

 */

class Auto_typography {



	// Block level elements that should not be wrapped inside <p> tags

	var $block_elements = 'div|blockquote|pre|code|h\d|script|ol|un';

	

	// 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';	





	/**

	 * Main Processing Function

	 *

	 */

	function convert($str)

	{

		if ($str == '')

		{

			return '';

		}

		

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

		

		// Standardize Newlines to make matching easier

		$str = preg_replace("/(\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);



		/*

		 * 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);



		// 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 entities, but since these are directional, it does

	 * it based on some rules.  It also converts em-dashes

	 * and a couple other things.

	 */

	function format_characters($str)

	{	

		$table = array(

						' "'		=> " &#8220;",

						'" '		=> "&#8221; ",

						" '"		=> " &#8216;",

						"' "		=> "&#8217; ",

						

						'>"'		=> ">&#8220;",

						'"<'		=> "&#8221;<",

						">'"		=> ">&#8216;",

						"'<"		=> "&#8217;<",



						"\"."		=> "&#8221;.",

						"\","		=> "&#8221;,",

						"\";"		=> "&#8221;;",

						"\":"		=> "&#8221;:",

						"\"!"		=> "&#8221;!",

						"\"?"		=> "&#8221;?",

						

						".  "		=> ".&nbsp; ",

						"?  "		=> "?&nbsp; ",

						"!  "		=> "!&nbsp; ",

						":  "		=> ":&nbsp; ",

					);



		// These deal with quotes within quotes, like:  "'hi here'"

		$start = 0;

		$space = array("\n", "\t", " ");

		

		while(TRUE)

		{

			$current = strpos(substr($str, $start), "\"'");

			

			if ($current === FALSE) break;

			

			$one_before = substr($str, $start+$current-1, 1);

			$one_after = substr($str, $start+$current+2, 1);

			

			if ( ! in_array($one_after, $space, TRUE) && $one_after != "<")

			{

				$str = str_replace(	$one_before."\"'".$one_after,

									$one_before."&#8220;&#8216;".$one_after,

									$str);

			}

			elseif ( ! in_array($one_before, $space, TRUE) && (in_array($one_after, $space, TRUE) OR $one_after == '<'))

			{

				$str = str_replace(	$one_before."\"'".$one_after,

									$one_before."&#8221;&#8217;".$one_after,

									$str);

			}

			

			$start = $start+$current+2;

		}

		

		$start = 0;

		

		while(TRUE)

		{

			$current = strpos(substr($str, $start), "'\"");

			

			if ($current === FALSE) break;

			

			$one_before = substr($str, $start+$current-1, 1);

			$one_after = substr($str, $start+$current+2, 1);

			

			if ( in_array($one_before, $space, TRUE) && ! in_array($one_after, $space, TRUE) && $one_after != "<")

			{

				$str = str_replace(	$one_before."'\"".$one_after,

									$one_before."&#8216;&#8220;".$one_after,

									$str);

			}

			elseif ( ! in_array($one_before, $space, TRUE) && $one_before != ">")

			{

				$str = str_replace(	$one_before."'\"".$one_after,

									$one_before."&#8217;&#8221;".$one_after,

									$str);

			}

			

			$start = $start+$current+2;

		}

		

		// Are there quotes within a word, as in:  ("something")

		if (preg_match_all("/(.)\"(\S+?)\"(.)/", $str, $matches))

		{

			for ($i=0, $s=sizeof($matches['0']); $i < $s; ++$i)

			{

				if ( ! in_array($matches['1'][$i], $space, TRUE) && ! in_array($matches['3'][$i], $space, TRUE))

				{

					$str = str_replace(	$matches['0'][$i],

										$matches['1'][$i]."&#8220;".$matches['2'][$i]."&#8221;".$matches['3'][$i],

										$str);

				}

			}

		}

		

		if (preg_match_all("/(.)\'(\S+?)\'(.)/", $str, $matches))

		{

			for ($i=0, $s=sizeof($matches['0']); $i < $s; ++$i)

			{

				if ( ! in_array($matches['1'][$i], $space, TRUE) && ! in_array($matches['3'][$i], $space, TRUE))

				{

					$str = str_replace(	$matches['0'][$i],

										$matches['1'][$i]."&#8216;".$matches['2'][$i]."&#8217;".$matches['3'][$i],

										$str);

				}

			}

		}

		

		// How about one apostrophe, as in Rick's

		$start = 0;

		

		while(TRUE)

		{

			$current = strpos(substr($str, $start), "'");

			

			if ($current === FALSE) break;

			

			$one_before = substr($str, $start+$current-1, 1);

			$one_after = substr($str, $start+$current+1, 1);

			

			if ( ! in_array($one_before, $space, TRUE) && ! in_array($one_after, $space, TRUE))

			{

				$str = str_replace(	$one_before."'".$one_after,

									$one_before."&#8217;".$one_after,

									$str);

			}

			

			$start = $start+$current+2;

		}



		// Em-dashes

		$start = 0;

		while(TRUE)

		{

			$current = strpos(substr($str, $start), "--");

			

			if ($current === FALSE) break;

			

			$one_before = substr($str, $start+$current-1, 1);

			$one_after = substr($str, $start+$current+2, 1);

			$two_before = substr($str, $start+$current-2, 1);

			$two_after = substr($str, $start+$current+3, 1);

			

			if (( ! in_array($one_before, $space, TRUE) && ! in_array($one_after, $space, TRUE))

				OR

				( ! in_array($two_before, $space, TRUE) && ! in_array($two_after, $space, TRUE) && $one_before == ' ' && $one_after == ' ')

				)

			{

				$str = str_replace(	$two_before.$one_before."--".$one_after.$two_after,

									$two_before.trim($one_before)."&#8212;".trim($one_after).$two_after,

									$str);

			}

			

			$start = $start+$current+2;

		}

		

		// Ellipsis

		$str = preg_replace("#(\w)\.\.\.(\s|<br />|</p>)#", "\\1&#8230;\\2", $str);

		$str = preg_replace("#(\s|<br />|</p>)\.\.\.(\w)#", "\\1&#8230;\\2", $str);

		

		// Run the translation array we defined above		

		$str = str_replace(array_keys($table), array_values($table), $str);

		

		// If there are any stray double quotes we'll catch them here

		

		$start = 0;

		

		while(TRUE)

		{

			$current = strpos(substr($str, $start), '"');

			

			if ($current === FALSE) break;

			

			$one_before = substr($str, $start+$current-1, 1);

			$one_after = substr($str, $start+$current+1, 1);

			

			if ( ! in_array($one_after, $space, TRUE))

			{

				$str = str_replace(	$one_before.'"'.$one_after,

									$one_before."&#8220;".$one_after,

									$str);

			}

			elseif( ! in_array($one_before, $space, TRUE))

			{

				$str = str_replace(	$one_before."'".$one_after,

									$one_before."&#8221;".$one_after,

									$str);

			}

			

			$start = $start+$current+2;

		}

		

		$start = 0;

		

		while(TRUE)

		{

			$current = strpos(substr($str, $start), "'");

			

			if ($current === FALSE) break;

			

			$one_before = substr($str, $start+$current-1, 1);

			$one_after = substr($str, $start+$current+1, 1);

			

			if ( ! in_array($one_after, $space, TRUE))

			{

				$str = str_replace(	$one_before."'".$one_after,

									$one_before."&#8216;".$one_after,

									$str);

			}

			elseif( ! in_array($one_before, $space, TRUE))

			{

				$str = str_replace(	$one_before."'".$one_after,

									$one_before."&#8217;".$one_after,

									$str);

			}

			

			$start = $start+$current+2;

		}

		

		return $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>';

	}	

}





?>