410 行
无行尾
12 KiB
PHP
410 行
无行尾
12 KiB
PHP
<?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.')#' => '<$1',
|
|
|
|
// Clean up stray non-breaking spaces preceeding block elements
|
|
'#( \s*)+<('.$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 */ |