diff options
Diffstat (limited to 'system/libraries/Typography.php')
| -rw-r--r-- | system/libraries/Typography.php | 154 |
1 files changed, 83 insertions, 71 deletions
diff --git a/system/libraries/Typography.php b/system/libraries/Typography.php index 0f0a8b7a2..d8b295e7b 100644 --- a/system/libraries/Typography.php +++ b/system/libraries/Typography.php @@ -28,22 +28,22 @@ 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 $protect_braced_quotes = FALSE; - + /** * Nothing to do here... * @@ -56,11 +56,11 @@ class CI_Typography { * Auto Typography * * This function converts text, making it typographically correct: - * - Converts double spaces into paragraphs. - * - Converts single line breaks into <br /> tags - * - Converts single and double quotes into correctly facing curly quote entities. - * - Converts three dots into ellipsis. - * - Converts double dashes into em-dashes. + * - Converts double spaces into paragraphs. + * - Converts single line breaks into <br /> tags + * - Converts single and double quotes into correctly facing curly quote entities. + * - Converts three dots into ellipsis. + * - Converts double dashes into em-dashes. * - Converts two spaces into entities * * @access public @@ -78,15 +78,15 @@ class CI_Typography { // Standardize Newlines to make matching easier if (strpos($str, "\r") !== FALSE) { - $str = str_replace(array("\r\n", "\r"), "\n", $str); + $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 $html_comments = array(); @@ -101,50 +101,50 @@ class CI_Typography { } } } - + // match and yank <pre> tags if they exist. It's cheaper to do this separately since most content will // not contain <pre> tags, and it keeps the PCRE patterns below simpler and faster if (strpos($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); + $str = preg_replace_callback("#\{.+?\}#si", array($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 + + // 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... - // } + // + // [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 + + // 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)) @@ -153,7 +153,7 @@ class CI_Typography { { $process = ($match[1] == '/') ? TRUE : FALSE; } - + if ($match[1] == '') { $this->last_block_element = $match[2]; @@ -162,32 +162,32 @@ class CI_Typography { $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"; + $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++) { @@ -196,18 +196,18 @@ class CI_Typography { // 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 - + '/(<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.')#' => '<$1', @@ -219,10 +219,19 @@ class CI_Typography { '/\{@DQ\}/' => '"', '/\{@SQ\}/' => "'", '/\{@DD\}/' => '--', - '/\{@NBS\}/' => ' ' + '/\{@NBS\}/' => ' ', + + // An unintended consequence of the _format_newlines function is that + // some of the newlines get truncated, resulting in <p> tags + // starting immediately after <block> tags on the same line. + // This forces a newline after such occurrences, which looks much nicer. + "/><p>\n/" => ">\n<p>", + // Similarly, there might be cases where a closing </block> will follow + // a closing </p> tag, so we'll correct it by adding a newline in between + "#</p></#" => "</p>\n</" ); - + // Do we need to reduce empty lines? if ($reduce_linebreaks === TRUE) { @@ -234,13 +243,13 @@ class CI_Typography { // otherwise most browsers won't treat them as true paragraphs $table['#<p></p>#'] = '<p> </p>'; } - + return preg_replace(array_keys($table), $table, $str); } - + // -------------------------------------------------------------------- - + /** * Format Characters * @@ -255,10 +264,10 @@ class CI_Typography { function format_characters($str) { static $table; - + if ( ! isset($table)) { - $table = array( + $table = array( // nested smart quotes, opening and closing // note that rules for grammar (English) allow only for two levels deep // and that single quotes are _supposed_ to always be on the outside @@ -304,7 +313,7 @@ class CI_Typography { return preg_replace(array_keys($table), $table, $str); } - + // -------------------------------------------------------------------- /** @@ -315,47 +324,50 @@ class CI_Typography { * @access public * @param string * @return string - */ + */ function _format_newlines($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") { - $str = '<p>'.$str.'</p>'; + // 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 $str; } - + // ------------------------------------------------------------------------ - + /** * Protect Characters * * Protects special characters from being formatted later * We don't want quotes converted within tags so we'll temporarily convert them to {@DQ} and {@SQ} - * and we don't want double dashes converted to emdash entities, so they are marked with {@DD} - * likewise double spaces are converted to {@NBS} to prevent entity conversion + * and we don't want double dashes converted to emdash entities, so they are marked with {@DD} + * likewise double spaces are converted to {@NBS} to prevent entity conversion * * @access public * @param array @@ -367,19 +379,19 @@ class CI_Typography { } // -------------------------------------------------------------------- - + /** * Convert newlines to HTML line breaks except within PRE tags * * @access public * @param string * @return string - */ + */ function nl2br_except_pre($str) { $ex = explode("pre>",$str); $ct = count($ex); - + $newstr = ""; for ($i = 0; $i < $ct; $i++) { @@ -391,14 +403,14 @@ class CI_Typography { { $newstr .= $ex[$i]; } - + if ($ct - 1 != $i) $newstr .= "pre>"; } - + return $newstr; } - + } // END Typography Class |