| <?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 - 2010, 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 $protect_braced_quotes = FALSE; |
| |
| /** |
| * Nothing to do here... |
| * |
| */ |
| function CI_Typography() |
| { |
| } |
| |
| /** |
| * Auto Typography |
| * |
| * This function converts text, making it typographically correct: |
| * - Converts double spaces into paragraphs. |
| * - Converts single line breaks into <br /> tags |
| * - Converts single and double quotes into correctly facing curly quote entities. |
| * - Converts three dots into ellipsis. |
| * - Converts double dashes into em-dashes. |
| * - Converts two spaces into entities |
| * |
| * @access public |
| * @param string |
| * @param bool whether to reduce more then two consecutive newlines to two |
| * @return string |
| */ |
| function auto_typography($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.')#' => '<$1', |
| |
| // Clean up stray non-breaking spaces preceeding block elements |
| '#( \s*)+<('.$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 |
| $table['#<p></p>#'] = '<p> </p>'; |
| } |
| |
| return preg_replace(array_keys($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)) |
| { |
| $table = array( |
| // nested smart quotes, opening and closing |
| // note that rules for grammar (English) allow only for two levels deep |
| // and that single quotes are _supposed_ to always be on the outside |
| // but we'll accommodate both |
| // Note that in all cases, whitespace is the primary determining factor |
| // on which direction to curl, with non-word characters like punctuation |
| // being a secondary factor only after whitespace is addressed. |
| '/\'"(\s|$)/' => '’”$1', |
| '/(^|\s|<p>)\'"/' => '$1‘“', |
| '/\'"(\W)/' => '’”$1', |
| '/(\W)\'"/' => '$1‘“', |
| '/"\'(\s|$)/' => '”’$1', |
| '/(^|\s|<p>)"\'/' => '$1“‘', |
| '/"\'(\W)/' => '”’$1', |
| '/(\W)"\'/' => '$1“‘', |
| |
| // single quote smart quotes |
| '/\'(\s|$)/' => '’$1', |
| '/(^|\s|<p>)\'/' => '$1‘', |
| '/\'(\W)/' => '’$1', |
| '/(\W)\'/' => '$1‘', |
| |
| // double quote smart quotes |
| '/"(\s|$)/' => '”$1', |
| '/(^|\s|<p>)"/' => '$1“', |
| '/"(\W)/' => '”$1', |
| '/(\W)"/' => '$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 && ! 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 */ |