425 lines
14 KiB
PHP
425 lines
14 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2018, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* Typography Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Helpers
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/libraries/typography.html
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*/
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class CI_Typography {
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/**
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* Block level elements that should not be wrapped inside <p> tags
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*
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* @var string
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*/
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public $block_elements = 'address|blockquote|div|dl|fieldset|form|h\d|hr|noscript|object|ol|p|pre|script|table|ul';
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/**
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* Elements that should not have <p> and <br /> tags within them.
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*
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* @var string
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*/
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public $skip_elements = 'p|pre|ol|ul|dl|object|table|h\d';
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/**
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* Tags we want the parser to completely ignore when splitting the string.
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*
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* @var string
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*/
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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';
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/**
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* array of block level elements that require inner content to be within another block level element
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*
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* @var array
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*/
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public $inner_block_required = array('blockquote');
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/**
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* the last block element parsed
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*
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* @var string
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*/
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public $last_block_element = '';
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/**
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* whether or not to protect quotes within { curly braces }
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*
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* @var bool
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*/
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public $protect_braced_quotes = FALSE;
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/**
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* Auto Typography
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*
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* This function converts text, making it typographically correct:
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* - Converts double spaces into paragraphs.
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* - Converts single line breaks into <br /> tags
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* - Converts single and double quotes into correctly facing curly quote entities.
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* - Converts three dots into ellipsis.
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* - Converts double dashes into em-dashes.
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* - Converts two spaces into entities
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*
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* @param string
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* @param bool whether to reduce more then two consecutive newlines to two
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* @return string
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*/
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public function auto_typography($str, $reduce_linebreaks = FALSE)
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{
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if ($str === '')
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{
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return '';
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}
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// Standardize Newlines to make matching easier
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if (strpos($str, "\r") !== FALSE)
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{
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$str = str_replace(array("\r\n", "\r"), "\n", $str);
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}
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// Reduce line breaks. If there are more than two consecutive linebreaks
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// we'll compress them down to a maximum of two since there's no benefit to more.
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if ($reduce_linebreaks === TRUE)
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{
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$str = preg_replace("/\n\n+/", "\n\n", $str);
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}
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// HTML comment tags don't conform to patterns of normal tags, so pull them out separately, only if needed
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$html_comments = array();
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if (strpos($str, '<!--') !== FALSE && preg_match_all('#(<!\-\-.*?\-\->)#s', $str, $matches))
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{
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for ($i = 0, $total = count($matches[0]); $i < $total; $i++)
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{
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$html_comments[] = $matches[0][$i];
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$str = str_replace($matches[0][$i], '{@HC'.$i.'}', $str);
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}
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}
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// match and yank <pre> tags if they exist. It's cheaper to do this separately since most content will
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// not contain <pre> tags, and it keeps the PCRE patterns below simpler and faster
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if (strpos($str, '<pre') !== FALSE)
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{
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$str = preg_replace_callback('#<pre.*?>.*?</pre>#si', array($this, '_protect_characters'), $str);
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}
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// Convert quotes within tags to temporary markers.
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$str = preg_replace_callback('#<.+?>#si', array($this, '_protect_characters'), $str);
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// Do the same with braces if necessary
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if ($this->protect_braced_quotes === TRUE)
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{
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$str = preg_replace_callback('#\{.+?\}#si', array($this, '_protect_characters'), $str);
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}
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// Convert "ignore" tags to temporary marker. The parser splits out the string at every tag
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// it encounters. Certain inline tags, like image tags, links, span tags, etc. will be
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// adversely affected if they are split out so we'll convert the opening bracket < temporarily to: {@TAG}
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$str = preg_replace('#<(/*)('.$this->inline_elements.')([ >])#i', '{@TAG}\\1\\2\\3', $str);
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/* Split the string at every tag. This expression creates an array with this prototype:
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*
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* [array]
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* {
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* [0] = <opening tag>
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* [1] = Content...
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* [2] = <closing tag>
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* Etc...
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* }
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*/
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$chunks = preg_split('/(<(?:[^<>]+(?:"[^"]*"|\'[^\']*\')?)+>)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);
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// Build our finalized string. We cycle through the array, skipping tags, and processing the contained text
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$str = '';
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$process = TRUE;
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for ($i = 0, $c = count($chunks) - 1; $i <= $c; $i++)
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{
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// Are we dealing with a tag? If so, we'll skip the processing for this cycle.
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// Well also set the "process" flag which allows us to skip <pre> tags and a few other things.
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if (preg_match('#<(/*)('.$this->block_elements.').*?>#', $chunks[$i], $match))
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{
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if (preg_match('#'.$this->skip_elements.'#', $match[2]))
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{
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$process = ($match[1] === '/');
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}
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if ($match[1] === '')
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{
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$this->last_block_element = $match[2];
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}
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$str .= $chunks[$i];
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continue;
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}
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if ($process === FALSE)
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{
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$str .= $chunks[$i];
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continue;
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}
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// Force a newline to make sure end tags get processed by _format_newlines()
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if ($i === $c)
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{
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$chunks[$i] .= "\n";
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}
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// Convert Newlines into <p> and <br /> tags
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$str .= $this->_format_newlines($chunks[$i]);
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}
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// No opening block level tag? Add it if needed.
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if ( ! preg_match('/^\s*<(?:'.$this->block_elements.')/i', $str))
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{
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$str = preg_replace('/^(.*?)<('.$this->block_elements.')/i', '<p>$1</p><$2', $str);
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}
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// Convert quotes, elipsis, em-dashes, non-breaking spaces, and ampersands
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$str = $this->format_characters($str);
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// restore HTML comments
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for ($i = 0, $total = count($html_comments); $i < $total; $i++)
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{
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// remove surrounding paragraph tags, but only if there's an opening paragraph tag
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// otherwise HTML comments at the ends of paragraphs will have the closing tag removed
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// if '<p>{@HC1}' then replace <p>{@HC1}</p> with the comment, else replace only {@HC1} with the comment
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$str = preg_replace('#(?(?=<p>\{@HC'.$i.'\})<p>\{@HC'.$i.'\}(\s*</p>)|\{@HC'.$i.'\})#s', $html_comments[$i], $str);
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}
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// Final clean up
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$table = array(
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// If the user submitted their own paragraph tags within the text
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// we will retain them instead of using our tags.
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'/(<p[^>*?]>)<p>/' => '$1', // <?php BBEdit syntax coloring bug fix
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// Reduce multiple instances of opening/closing paragraph tags to a single one
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'#(</p>)+#' => '</p>',
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'/(<p>\W*<p>)+/' => '<p>',
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// Clean up stray paragraph tags that appear before block level elements
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'#<p></p><('.$this->block_elements.')#' => '<$1',
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// Clean up stray non-breaking spaces preceding block elements
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'#( \s*)+<('.$this->block_elements.')#' => ' <$2',
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// Replace the temporary markers we added earlier
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'/\{@TAG\}/' => '<',
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'/\{@DQ\}/' => '"',
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'/\{@SQ\}/' => "'",
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'/\{@DD\}/' => '--',
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'/\{@NBS\}/' => ' ',
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// An unintended consequence of the _format_newlines function is that
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// some of the newlines get truncated, resulting in <p> tags
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// starting immediately after <block> tags on the same line.
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// This forces a newline after such occurrences, which looks much nicer.
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"/><p>\n/" => ">\n<p>",
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// Similarly, there might be cases where a closing </block> will follow
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// a closing </p> tag, so we'll correct it by adding a newline in between
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'#</p></#' => "</p>\n</"
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);
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// Do we need to reduce empty lines?
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if ($reduce_linebreaks === TRUE)
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{
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$table['#<p>\n*</p>#'] = '';
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}
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else
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{
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// If we have empty paragraph tags we add a non-breaking space
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// otherwise most browsers won't treat them as true paragraphs
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$table['#<p></p>#'] = '<p> </p>';
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}
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return preg_replace(array_keys($table), $table, $str);
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}
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// --------------------------------------------------------------------
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/**
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* Format Characters
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*
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* This function mainly converts double and single quotes
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* to curly entities, but it also converts em-dashes,
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* double spaces, and ampersands
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*
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* @param string
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* @return string
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*/
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public function format_characters($str)
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{
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static $table;
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if ( ! isset($table))
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{
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$table = array(
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// nested smart quotes, opening and closing
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// note that rules for grammar (English) allow only for two levels deep
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// and that single quotes are _supposed_ to always be on the outside
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// but we'll accommodate both
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// Note that in all cases, whitespace is the primary determining factor
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// on which direction to curl, with non-word characters like punctuation
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// being a secondary factor only after whitespace is addressed.
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'/\'"(\s|$)/' => '’”$1',
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'/(^|\s|<p>)\'"/' => '$1‘“',
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'/\'"(\W)/' => '’”$1',
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'/(\W)\'"/' => '$1‘“',
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'/"\'(\s|$)/' => '”’$1',
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'/(^|\s|<p>)"\'/' => '$1“‘',
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'/"\'(\W)/' => '”’$1',
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'/(\W)"\'/' => '$1“‘',
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// single quote smart quotes
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'/\'(\s|$)/' => '’$1',
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'/(^|\s|<p>)\'/' => '$1‘',
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'/\'(\W)/' => '’$1',
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'/(\W)\'/' => '$1‘',
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// double quote smart quotes
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'/"(\s|$)/' => '”$1',
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'/(^|\s|<p>)"/' => '$1“',
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'/"(\W)/' => '”$1',
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'/(\W)"/' => '$1“',
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// apostrophes
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"/(\w)'(\w)/" => '$1’$2',
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// Em dash and ellipses dots
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'/\s?\-\-\s?/' => '—',
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'/(\w)\.{3}/' => '$1…',
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// double space after sentences
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'/(\W) /' => '$1 ',
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// ampersands, if not a character entity
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'/&(?!#?[a-zA-Z0-9]{2,};)/' => '&'
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);
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}
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return preg_replace(array_keys($table), $table, $str);
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}
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// --------------------------------------------------------------------
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/**
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* Format Newlines
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*
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* Converts newline characters into either <p> tags or <br />
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*
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* @param string
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* @return string
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*/
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protected function _format_newlines($str)
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{
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if ($str === '' OR (strpos($str, "\n") === FALSE && ! in_array($this->last_block_element, $this->inner_block_required)))
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{
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return $str;
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}
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// Convert two consecutive newlines to paragraphs
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$str = str_replace("\n\n", "</p>\n\n<p>", $str);
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// Convert single spaces to <br /> tags
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$str = preg_replace("/([^\n])(\n)([^\n])/", '\\1<br />\\2\\3', $str);
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// Wrap the whole enchilada in enclosing paragraphs
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if ($str !== "\n")
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{
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// We trim off the right-side new line so that the closing </p> tag
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// will be positioned immediately following the string, matching
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// the behavior of the opening <p> tag
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$str = '<p>'.rtrim($str).'</p>';
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}
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// Remove empty paragraphs if they are on the first line, as this
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// is a potential unintended consequence of the previous code
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return preg_replace('/<p><\/p>(.*)/', '\\1', $str, 1);
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}
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// ------------------------------------------------------------------------
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/**
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* Protect Characters
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*
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* Protects special characters from being formatted later
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* We don't want quotes converted within tags so we'll temporarily convert them to {@DQ} and {@SQ}
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* and we don't want double dashes converted to emdash entities, so they are marked with {@DD}
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* likewise double spaces are converted to {@NBS} to prevent entity conversion
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*
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* @param array
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* @return string
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*/
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protected function _protect_characters($match)
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{
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return str_replace(array("'",'"','--',' '), array('{@SQ}', '{@DQ}', '{@DD}', '{@NBS}'), $match[0]);
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}
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// --------------------------------------------------------------------
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/**
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* Convert newlines to HTML line breaks except within PRE tags
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*
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* @param string
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* @return string
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*/
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public function nl2br_except_pre($str)
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{
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$newstr = '';
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for ($ex = explode('pre>', $str), $ct = count($ex), $i = 0; $i < $ct; $i++)
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{
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$newstr .= (($i % 2) === 0) ? nl2br($ex[$i]) : $ex[$i];
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if ($ct - 1 !== $i)
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{
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$newstr .= 'pre>';
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}
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}
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return $newstr;
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}
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}
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