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<?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) 2008, 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 = 'address|blockquote|div|dl|fieldset|form|h\d|hr|noscript|object|ol|p|pre|script|table|ul';

	// Elements that should not have <p> and <br /> tags within them.

	var $skip_elements	= 'p|pre|ol|ul|dl|object|table';

	// Tags we want the parser to completely ignore when splitting the string.

	var $inline_elements = 'a|abbr|acronym|b|bdo|br|button|cite|code|del|dfn|em|i|img|ins|input|label|map|kbd|samp|select|span|strong|sub|sup|textarea|var';

	// whether or not to protect quotes within { curly braces }

	var $protect_braced_quotes = FALSE;

	/**

	 * Nothing to do here...

	 *

	 */

	function CI_Typography()

	{

	}

	/**

	 * Auto Typography

	 *

	 * This function converts text, making it typographically correct:

	 * 	- Converts double spaces into paragraphs.

	 * 	- Converts single line breaks into <br /> tags

	 * 	- Converts single and double quotes into correctly facing curly quote entities.

	 * 	- Converts three dots into ellipsis.

	 * 	- Converts double dashes into em-dashes.

	 *  - Converts two spaces into entities

	 *

	 * @access	public

	 * @param	string

	 * @param	bool	whether to strip javascript event handlers for security

	 * @param	bool	whether to reduce more then two consecutive newlines to two

	 * @return	string

	 */

	function auto_typography($str, $strip_js_event_handlers = TRUE, $reduce_linebreaks = FALSE)

	{

		if ($str == '')

		{

			return '';

		}

		// 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 linebreaks

		// we'll compress them down to a maximum of two since there's no benefit to more.

		if ($reduce_linebreaks === TRUE)

		{

			$str = preg_replace("/\n\n+/", "\n\n", $str);

		}

		 // Do we allow JavaScript event handlers? If not, we strip them from within all tags

		if ($strip_js_event_handlers === TRUE)

		{

			$str = preg_replace("#<([^><]+?)([^a-z_\-]on\w*|xmlns)(\s*=\s*[^><]*)([><]*)#i", "<\\1\\4", $str);

		}

		// Convert quotes within tags to temporary markers. 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);

			}

		}

		if ($this->protect_braced_quotes === TRUE)

		{

			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);

				}

			}

		}

		// 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 bracket < temporarily to: {@TAG}

		$str = preg_replace("#<(/*)(".$this->inline_elements.")([ >])#i", "{@TAG}\\1\\2\\3", $str);

		// Split the string at every tag.  This expression creates an array with this prototype:

		//

		// 	[array]

		// 	{

		// 		[0] = <opening tag>

		// 		[1] = Content...

		// 		[2] = <closing tag>

		// 		Etc...

		// 	}

		$chunks = preg_split('/(<(?:[^<>]+(?:"[^"]*"|\'[^\']*\')?)+>)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);

		// Build our finalized string.  We cycle through the array, skipping tags, and processing the contained text

		$str = '';

		$process = TRUE;

		$paragraph = FALSE;

		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);

		}

		// is the whole of the content inside a block level element?

		if ( ! preg_match("/^<(?:".$this->block_elements.")/i", $str, $match))

		{

			$str = "<p>{$str}</p>";

		}

		// Convert quotes, elipsis, and em-dashes

		$str = $this->format_characters($str);

		// Final clean up

		$table = array(

						// If the user submitted their own paragraph tags within the text

						// we will retain them instead of using our tags.

						'/(<p.*?>)<p>/'		=> '$1', // <?php BBEdit syntax coloring bug fix

						// Reduce multiple instances of opening/closing paragraph tags to a single one

						'#(</p>)+#'			=> '</p>',

						'/(<p><p>)+/'		=> '<p>',

						// Clean up stray paragraph tags that appear before block level elements

						'#<p></p><('.$this->block_elements.')#'	=> '<$1',

						// Replace the temporary markers we added earlier

						'/\{@TAG\}/'		=> '<',

						'/\{@DQ\}/'			=> '"',

						'/\{@SQ\}/'			=> "'"

						);

		// Do we need to reduce empty lines?

		if ($reduce_linebreaks === TRUE)

		{

			$table['#<p>\n*</p>#'] = '';

		}

		else

		{

			// If we have empty paragraph tags we add a non-breaking space

			// otherwise most browsers won't treat them as true paragraphs

			$table['#<p></p>#'] = '<p>&nbsp;</p>';

		}

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

	}

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

	/**

	 * Format Characters

	 *

	 * This function mainly converts double and single quotes

	 * to curly entities, but it also converts em-dashes,

	 * double spaces, and ampersands

	 *

	 * @access	public

	 * @param	string

	 * @return	string

	 */

	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}/'					=> '$1…',

							// double space after sentences

							'/(\W)  /'						=> '$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 />

	 *

	 * @access	public

	 * @param	string

	 * @return	string

	 */

	function _format_newlines($str)

	{

		if ($str == '')

		{

			return $str;

		}

		if (strpos($str, "\n") === FALSE)

		{

			return $str;

		}

		// Convert two consecutive newlines to paragraphs

		$str = str_replace("\n\n", "</p>\n\n<p>", $str);

		// Convert single spaces to <br /> tags

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

		// Wrap the whole enchilada in enclosing paragraphs

		if ($str != "\n")

		{

			$str =  '<p>'.$str.'</p>';

		}

		// Remove empty paragraphs if they are on the first line, as this

		// is a potential unintended consequence of the previous code

		$str = preg_replace("/<p><\/p>(.*)/", "\\1", $str, 1);

		return $str;

	}

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

	/**

	 * 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;

	}

}

// END Typography Class

/* End of file Typography.php */

/* Location: ./system/libraries/Typography.php */