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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008 - 2011, 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|h\d';

        // Tags we want the parser to completely ignore when splitting the string.
        var $inline_elements = 'a|abbr|acronym|b|bdo|big|br|button|cite|code|del|dfn|em|i|img|ins|input|label|map|kbd|q|samp|select|small|span|strong|sub|sup|textarea|tt|var';

        // array of block level elements that require inner content to be within another block level element
        var $inner_block_required = array('blockquote');

        // the last block element parsed
        var $last_block_element = '';

        // whether or not to protect quotes within { curly braces }
        var $protect_braced_quotes = FALSE;

        /**
         * 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 reduce more then two consecutive newlines to two
         * @return      string
         */
        function auto_typography($str, $reduce_linebreaks = FALSE)
        {
                if ($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);
                }

                // HTML comment tags don't conform to patterns of normal tags, so pull them out separately, only if needed
                $html_comments = array();
                if (strpos($str, '<!--') !== FALSE)
                {
                        if (preg_match_all("#(<!\-\-.*?\-\->)#s", $str, $matches))
                        {
                                for ($i = 0, $total = count($matches[0]); $i < $total; $i++)
                                {
                                        $html_comments[] = $matches[0][$i];
                                        $str = str_replace($matches[0][$i], '{@HC'.$i.'}', $str);
                                }
                        }
                }

                // match and yank <pre> tags if they exist.  It's cheaper to do this separately since most content will
                // not contain <pre> tags, and it keeps the PCRE patterns below simpler and faster
                if (strpos($str, '<pre') !== FALSE)
                {
                        $str = preg_replace_callback("#<pre.*?>.*?</pre>#si", array($this, '_protect_characters'), $str);
                }

                // Convert quotes within tags to temporary markers.
                $str = preg_replace_callback("#<.+?>#si", array($this, '_protect_characters'), $str);

                // Do the same with braces if necessary
                if ($this->protect_braced_quotes === TRUE)
                {
                        $str = preg_replace_callback("#\{.+?\}#si", array($this, '_protect_characters'), $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;
                $current_chunk = 0;
                $total_chunks = count($chunks);

                foreach ($chunks as $chunk)
                {
                        $current_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;
                                }

                                if ($match[1] == '')
                                {
                                        $this->last_block_element = $match[2];
                                }

                                $str .= $chunk;
                                continue;
                        }

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

                        //  Force a newline to make sure end tags get processed by _format_newlines()
                        if ($current_chunk == $total_chunks)
                        {
                                $chunk .= "\n";
                        }

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

                // No opening block level tag?  Add it if needed.
                if ( ! preg_match("/^\s*<(?:".$this->block_elements.")/i", $str))
                {
                        $str = preg_replace("/^(.*?)<(".$this->block_elements.")/i", '<p>$1</p><$2', $str);
                }

                // Convert quotes, elipsis, em-dashes, non-breaking spaces, and ampersands
                $str = $this->format_characters($str);

                // restore HTML comments
                for ($i = 0, $total = count($html_comments); $i < $total; $i++)
                {
                        // remove surrounding paragraph tags, but only if there's an opening paragraph tag
                        // otherwise HTML comments at the ends of paragraphs will have the closing tag removed
                        // if '<p>{@HC1}' then replace <p>{@HC1}</p> with the comment, else replace only {@HC1} with the comment
                        $str = preg_replace('#(?(?=<p>\{@HC'.$i.'\})<p>\{@HC'.$i.'\}(\s*</p>)|\{@HC'.$i.'\})#s', $html_comments[$i], $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>\W*<p>)+/'        => '<p>',

                                                // Clean up stray paragraph tags that appear before block level elements
                                                '#<p></p><('.$this->block_elements.')#' => '<$1',

                                                // Clean up stray non-breaking spaces preceeding block elements
                                                '#(&nbsp;\s*)+<('.$this->block_elements.')#'    => '  <$2',

                                                // Replace the temporary markers we added earlier
                                                '/\{@TAG\}/'            => '<',
                                                '/\{@DQ\}/'                     => '"',
                                                '/\{@SQ\}/'                     => "'",
                                                '/\{@DD\}/'                     => '--',
                                                '/\{@NBS\}/'            => '  ',

                                                // An unintended consequence of the _format_newlines function is that
                                                // some of the newlines get truncated, resulting in <p> tags
                                                // starting immediately after <block> tags on the same line.
                                                // This forces a newline after such occurrences, which looks much nicer.
                                                "/><p>\n/"                      => ">\n<p>",

                                                // Similarly, there might be cases where a closing </block> will follow
                                                // a closing </p> tag, so we'll correct it by adding a newline in between
                                                "#</p></#"                      => "</p>\n</"
                                                );

                // 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))
                {
                        $table = array(
                                                        // nested smart quotes, opening and closing
                                                        // note that rules for grammar (English) allow only for two levels deep
                                                        // and that single quotes are _supposed_ to always be on the outside
                                                        // but we'll accommodate both
                                                        // Note that in all cases, whitespace is the primary determining factor
                                                        // on which direction to curl, with non-word characters like punctuation
                                                        // being a secondary factor only after whitespace is addressed.
                                                        '/\'"(\s|$)/'                                   => '&#8217;&#8221;$1',
                                                        '/(^|\s|<p>)\'"/'                               => '$1&#8216;&#8220;',
                                                        '/\'"(\W)/'                                             => '&#8217;&#8221;$1',
                                                        '/(\W)\'"/'                                             => '$1&#8216;&#8220;',
                                                        '/"\'(\s|$)/'                                   => '&#8221;&#8217;$1',
                                                        '/(^|\s|<p>)"\'/'                               => '$1&#8220;&#8216;',
                                                        '/"\'(\W)/'                                             => '&#8221;&#8217;$1',
                                                        '/(\W)"\'/'                                             => '$1&#8220;&#8216;',

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

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

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

                                                        // Em dash and ellipses dots
                                                        '/\s?\-\-\s?/'                                  => '&#8212;',
                                                        '/(\w)\.{3}/'                                   => '$1&#8230;',

                                                        // double space after sentences
                                                        '/(\W)  /'                                              => '$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 />
         *
         * @access      public
         * @param       string
         * @return      string
         */
        function _format_newlines($str)
        {
                if ($str == '')
                {
                        return $str;
                }

                if (strpos($str, "\n") === FALSE  && ! in_array($this->last_block_element, $this->inner_block_required))
                {
                        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")
                {
                        // We trim off the right-side new line so that the closing </p> tag
                        // will be positioned immediately following the string, matching
                        // the behavior of the opening <p> tag
                        $str =  '<p>'.rtrim($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;
        }

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

        /**
         * Protect Characters
         *
         * Protects special characters from being formatted later
         * We don't want quotes converted within tags so we'll temporarily convert them to {@DQ} and {@SQ}
         * and we don't want double dashes converted to emdash entities, so they are marked with {@DD}
         * likewise double spaces are converted to {@NBS} to prevent entity conversion
         *
         * @access      public
         * @param       array
         * @return      string
         */
        function _protect_characters($match)
        {
                return str_replace(array("'",'"','--','  '), array('{@SQ}', '{@DQ}', '{@DD}', '{@NBS}'), $match[0]);
        }

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

        /**
         * 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 */