You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
343 lines
13 KiB
343 lines
13 KiB
1 year ago
|
<?php
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This file is part of CodeIgniter 4 framework.
|
||
|
|
*
|
||
|
|
* (c) CodeIgniter Foundation <admin@codeigniter.com>
|
||
|
|
*
|
||
|
|
* For the full copyright and license information, please view
|
||
|
|
* the LICENSE file that was distributed with this source code.
|
||
|
|
*/
|
||
|
|
|
||
|
|
namespace CodeIgniter\Typography;
|
||
|
|
|
||
|
|
use Config\DocTypes;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Typography Class
|
||
|
|
*
|
||
|
|
* @see \CodeIgniter\Typography\TypographyTest
|
||
|
|
*/
|
||
|
|
class Typography
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* Block level elements that should not be wrapped inside <p> tags
|
||
|
|
*
|
||
|
|
* @var string
|
||
|
|
*/
|
||
|
|
public $blockElements = '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 string
|
||
|
|
*/
|
||
|
|
public $skipElements = 'p|pre|ol|ul|dl|object|table|h\d';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Tags we want the parser to completely ignore when splitting the string.
|
||
|
|
*
|
||
|
|
* @var string
|
||
|
|
*/
|
||
|
|
public $inlineElements = '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 $innerBlockRequired = ['blockquote'];
|
||
|
|
|
||
|
|
/**
|
||
|
|
* the last block element parsed
|
||
|
|
*
|
||
|
|
* @var string
|
||
|
|
*/
|
||
|
|
public $lastBlockElement = '';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* whether or not to protect quotes within { curly braces }
|
||
|
|
*
|
||
|
|
* @var bool
|
||
|
|
*/
|
||
|
|
public $protectBracedQuotes = 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 bool $reduceLinebreaks whether to reduce more then two consecutive newlines to two
|
||
|
|
*/
|
||
|
|
public function autoTypography(string $str, bool $reduceLinebreaks = false): string
|
||
|
|
{
|
||
|
|
if ($str === '') {
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
|
||
|
|
// Standardize Newlines to make matching easier
|
||
|
|
if (strpos($str, "\r") !== false) {
|
||
|
|
$str = str_replace(["\r\n", "\r"], "\n", $str);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reduce line breaks. If there are more than two consecutive linebreaks
|
||
|
|
// we'll compress them down to a maximum of two since there's no benefit to more.
|
||
|
|
if ($reduceLinebreaks === false) {
|
||
|
|
$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
|
||
|
|
$htmlComments = [];
|
||
|
|
if (strpos($str, '<!--') !== false && preg_match_all('#(<!\-\-.*?\-\->)#s', $str, $matches)) {
|
||
|
|
for ($i = 0, $total = count($matches[0]); $i < $total; $i++) {
|
||
|
|
$htmlComments[] = $matches[0][$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) {
|
||
|
|
$str = preg_replace_callback('#<pre.*?>.*?</pre>#si', [$this, 'protectCharacters'], $str);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert quotes within tags to temporary markers.
|
||
|
|
$str = preg_replace_callback('#<.+?>#si', [$this, 'protectCharacters'], $str);
|
||
|
|
|
||
|
|
// Do the same with braces if necessary
|
||
|
|
if ($this->protectBracedQuotes === false) {
|
||
|
|
$str = preg_replace_callback('#\{.+?\}#si', [$this, 'protectCharacters'], $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->inlineElements . ')([ >])#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->blockElements . ').*?>#', $chunks[$i], $match)) {
|
||
|
|
if (preg_match('#' . $this->skipElements . '#', $match[2])) {
|
||
|
|
$process = ($match[1] === '/');
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($match[1] === '') {
|
||
|
|
$this->lastBlockElement = $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 .= $this->formatNewLines($chunks[$i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
// No opening block level tag? Add it if needed.
|
||
|
|
if (! preg_match('/^\s*<(?:' . $this->blockElements . ')/i', $str)) {
|
||
|
|
$str = preg_replace('/^(.*?)<(' . $this->blockElements . ')/i', '<p>$1</p><$2', $str);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert quotes, elipsis, em-dashes, non-breaking spaces, and ampersands
|
||
|
|
$str = $this->formatCharacters($str);
|
||
|
|
|
||
|
|
foreach ($htmlComments as $i => $htmlComment) {
|
||
|
|
// 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', $htmlComment, $str);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Final clean up
|
||
|
|
$table = [
|
||
|
|
// 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->blockElements . ')#' => '<$1',
|
||
|
|
// Clean up stray non-breaking spaces preceeding block elements
|
||
|
|
'#( \s*)+<(' . $this->blockElements . ')#' => ' <$2',
|
||
|
|
// Replace the temporary markers we added earlier
|
||
|
|
'/\{@TAG\}/' => '<',
|
||
|
|
'/\{@DQ\}/' => '"',
|
||
|
|
'/\{@SQ\}/' => "'",
|
||
|
|
'/\{@DD\}/' => '--',
|
||
|
|
'/\{@NBS\}/' => ' ',
|
||
|
|
// An unintended consequence of the _format_newlines function is that
|
||
|
|
// some of the newlines get truncated, resulting in <p> tags
|
||
|
|
// starting immediately after <block> tags on the same line.
|
||
|
|
// This forces a newline after such occurrences, which looks much nicer.
|
||
|
|
"/><p>\n/" => ">\n<p>",
|
||
|
|
// Similarly, there might be cases where a closing </block> will follow
|
||
|
|
// a closing </p> tag, so we'll correct it by adding a newline in between
|
||
|
|
'#</p></#' => "</p>\n</",
|
||
|
|
];
|
||
|
|
|
||
|
|
// Do we need to reduce empty lines?
|
||
|
|
if ($reduceLinebreaks === 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
|
||
|
|
*/
|
||
|
|
public function formatCharacters(string $str): string
|
||
|
|
{
|
||
|
|
static $table;
|
||
|
|
|
||
|
|
if (! isset($table)) {
|
||
|
|
$table = [
|
||
|
|
// nested smart quotes, opening and closing
|
||
|
|
// note that rules for grammar (English) allow only for two levels deep
|
||
|
|
// and that single quotes are _supposed_ to always be on the outside
|
||
|
|
// but we'll accommodate both
|
||
|
|
// Note that in all cases, whitespace is the primary determining factor
|
||
|
|
// on which direction to curl, with non-word characters like punctuation
|
||
|
|
// being a secondary factor only after whitespace is addressed.
|
||
|
|
'/\'"(\s|$)/' => '’”$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>
|
||
|
|
*/
|
||
|
|
protected function formatNewLines(string $str): string
|
||
|
|
{
|
||
|
|
if ($str === '' || (strpos($str, "\n") === false && ! in_array($this->lastBlockElement, $this->innerBlockRequired, true))) {
|
||
|
|
return $str;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert two consecutive newlines to paragraphs
|
||
|
|
$str = str_replace("\n\n", "</p>\n\n<p>", $str);
|
||
|
|
|
||
|
|
// Convert single spaces to <br> tags
|
||
|
|
$br = '<br' . _solidus() . '>';
|
||
|
|
$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
|
||
|
|
*/
|
||
|
|
protected function protectCharacters(array $match): string
|
||
|
|
{
|
||
|
|
return str_replace(["'", '"', '--', ' '], ['{@SQ}', '{@DQ}', '{@DD}', '{@NBS}'], $match[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Convert newlines to HTML line breaks except within PRE tags
|
||
|
|
*/
|
||
|
|
public function nl2brExceptPre(string $str): string
|
||
|
|
{
|
||
|
|
$newstr = '';
|
||
|
|
$docTypes = new DocTypes();
|
||
|
|
|
||
|
|
for ($ex = explode('pre>', $str), $ct = count($ex), $i = 0; $i < $ct; $i++) {
|
||
|
|
$xhtml = ! ($docTypes->html5 ?? false);
|
||
|
|
$newstr .= (($i % 2) === 0) ? nl2br($ex[$i], $xhtml) : $ex[$i];
|
||
|
|
|
||
|
|
if ($ct - 1 !== $i) {
|
||
|
|
$newstr .= 'pre>';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return $newstr;
|
||
|
|
}
|
||
|
|
}
|