| <?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 = 'p|div|blockquote|pre|code|h\d|script|ol|ul'; |
| |
| // Elements that should not have <p> and <br /> tags within them. |
| var $skip_elements = 'p|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; |
| |
| // Whether to reduce more than two consecutive empty lines to a maximum of two |
| var $reduce_empty_lines = FALSE; |
| |
| /** |
| * Nothing to do here... |
| * |
| */ |
| function CI_Typography() |
| { |
| } |
| |
| /** |
| * Main Processing Function |
| * |
| */ |
| function convert($str) |
| { |
| if ($str == '') |
| { |
| return ''; |
| } |
| |
| // Standardize Newlines to make matching easier |
| if (strpos($str, "\r") !== FALSE) |
| { |
| $str = str_replace(array("\r\n", "\r"), "\n", $str); |
| } |
| |
| // Reduce line breaks. If there are more than two consecutive linebreaks |
| // we'll compress them down to a maximum of two since there's no benefit to more. |
| if ($this->reduce_empty_lines == TRUE) |
| { |
| $str = preg_replace("/\n\n+/", "\n\n", $str); |
| } |
| |
| // Do we allow JavaScript event handlers? If not, we strip them from within all tags |
| if ($this->allow_js_event_handlers == FALSE) |
| { |
| $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); |
| } |
| } |
| |
| // 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->ignore_elements.")#i", "{@TAG}\\1\\2", $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); |
| } |
| |
| // 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.')#' => '<$1', |
| |
| // Replace the temporary markers we added earlier |
| '/\{@TAG\}/' => '<', |
| '/\{@DQ\}/' => '"', |
| '/\{@SQ\}/' => "'" |
| |
| ); |
| |
| // Do we need to reduce empty lines? |
| if ($this->reduce_empty_lines == 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 |
| $table['#<p></p>#'] = '<p> </p>'; |
| } |
| |
| return preg_replace(array_keys($table), $table, $str); |
| |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Format Characters |
| * |
| * This function mainly converts double and single quotes |
| * to curly entities, but it also converts em-dashes, |
| * double spaces, and ampersands |
| */ |
| function format_characters($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) /' => '$1 ', |
| |
| // ampersands, if not a character entity |
| '/&(?!#?[a-zA-Z0-9]{2,};)/' => '&' |
| ); |
| } |
| |
| return preg_replace(array_keys($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 $str; |
| } |
| |
| $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; |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Reduce empty lines |
| * |
| * Sets a flag that tells the parser to reduce any instances of more than |
| * two consecutive linebreaks down to two |
| * |
| */ |
| function reduce_empty_lines($val = FALSE) |
| { |
| $this->reduce_empty_lines = ($val === FALSE) ? FALSE : TRUE; |
| } |
| } |
| // END Typography Class |
| |
| /* End of file Typography.php */ |
| /* Location: ./system/libraries/Typography.php */ |