Файл: Main Website Files/system/libraries/Typography.php
Строк: 477
<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2015, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link http://codeigniter.com
* @since Version 1.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Typography Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Helpers
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/typography.html
*/
class CI_Typography {
/**
* Block level elements that should not be wrapped inside <p> tags
*
* @var string
*/
public $block_elements = 'address|blockquote|div|dl|fieldset|form|hd|hr|noscript|object|ol|p|pre|script|table|ul';
/**
* Elements that should not have <p> and <br /> tags within them.
*
* @var string
*/
public $skip_elements = 'p|pre|ol|ul|dl|object|table|hd';
/**
* Tags we want the parser to completely ignore when splitting the string.
*
* @var string
*/
public $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 array
*/
public $inner_block_required = array('blockquote');
/**
* the last block element parsed
*
* @var string
*/
public $last_block_element = '';
/**
* whether or not to protect quotes within { curly braces }
*
* @var bool
*/
public $protect_braced_quotes = FALSE;
/**
* Auto Typography
*
* This function converts text, making it typographically correct:
* - Converts double spaces into paragraphs.
* - Converts single line breaks into <br /> tags
* - Converts single and double quotes into correctly facing curly quote entities.
* - Converts three dots into ellipsis.
* - Converts double dashes into em-dashes.
* - Converts two spaces into entities
*
* @param string
* @param bool whether to reduce more then two consecutive newlines to two
* @return string
*/
public function auto_typography($str, $reduce_linebreaks = FALSE)
{
if ($str === '')
{
return '';
}
// Standardize Newlines to make matching easier
if (strpos($str, "r") !== FALSE)
{
$str = str_replace(array("rn", "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("/nn+/", "nn", $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 && 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 = '';
$process = TRUE;
for ($i = 0, $c = count($chunks) - 1; $i <= $c; $i++)
{
// Are we dealing with a tag? If so, we'll skip the processing for this cycle.
// Well also set the "process" flag which allows us to skip <pre> tags and a few other things.
if (preg_match('#<(/*)('.$this->block_elements.').*?>#', $chunks[$i], $match))
{
if (preg_match('#'.$this->skip_elements.'#', $match[2]))
{
$process = ($match[1] === '/');
}
if ($match[1] === '')
{
$this->last_block_element = $match[2];
}
$str .= $chunks[$i];
continue;
}
if ($process === FALSE)
{
$str .= $chunks[$i];
continue;
}
// Force a newline to make sure end tags get processed by _format_newlines()
if ($i === $c)
{
$chunks[$i] .= "n";
}
// Convert Newlines into <p> and <br /> tags
$str .= $this->_format_newlines($chunks[$i]);
}
// No opening block level tag? Add it if needed.
if ( ! preg_match('/^s*<(?:'.$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, $str);
}
// --------------------------------------------------------------------
/**
* Format Characters
*
* This function mainly converts double and single quotes
* to curly entities, but it also converts em-dashes,
* double spaces, and ampersands
*
* @param string
* @return string
*/
public function format_characters($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, $str);
}
// --------------------------------------------------------------------
/**
* Format Newlines
*
* Converts newline characters into either <p> tags or <br />
*
* @param string
* @return string
*/
protected function _format_newlines($str)
{
if ($str === '' OR (strpos($str, "n") === FALSE && ! in_array($this->last_block_element, $this->inner_block_required)))
{
return $str;
}
// Convert two consecutive newlines to paragraphs
$str = str_replace("nn", "</p>nn<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
return preg_replace('/<p></p>(.*)/', '\1', $str, 1);
}
// ------------------------------------------------------------------------
/**
* Protect Characters
*
* Protects special characters from being formatted later
* We don't want quotes converted within tags so we'll temporarily convert them to {@DQ} and {@SQ}
* and we don't want double dashes converted to emdash entities, so they are marked with {@DD}
* likewise double spaces are converted to {@NBS} to prevent entity conversion
*
* @param array
* @return string
*/
protected function _protect_characters($match)
{
return str_replace(array("'",'"','--',' '), array('{@SQ}', '{@DQ}', '{@DD}', '{@NBS}'), $match[0]);
}
// --------------------------------------------------------------------
/**
* Convert newlines to HTML line breaks except within PRE tags
*
* @param string
* @return string
*/
public function nl2br_except_pre($str)
{
$newstr = '';
for ($ex = explode('pre>', $str), $ct = count($ex), $i = 0; $i < $ct; $i++)
{
$newstr .= (($i % 2) === 0) ? nl2br($ex[$i]) : $ex[$i];
if ($ct - 1 !== $i)
{
$newstr .= 'pre>';
}
}
return $newstr;
}
}