/**
* Convert consecutive line breaks into HTML paragraphs, and optionally
* (enabled by default) converts additional line breaks into HTML line
* breaks.
*
* @param string $value string to be formatted
* @return string formatted string
* @see https://core.trac.wordpress.org/browser/tags/4.4.2/src/wp-includes/formatting.php#L415
*/
protected function autop($value)
{
$preTags = [];
if (trim($value) === '') {
return '';
}
$value .= "\n";
// Skip <pre> tags by replacing them with placeholders and reinserting
// them after processing.
if (strpos($value, '<pre') !== false) {
$parts = explode('</pre>', $value);
$last = array_pop($parts);
$value = '';
$i = 0;
foreach ($parts as $part) {
$start = strpos($part, '<pre');
if ($start === false) {
// malformed HTML
$value .= $part;
continue;
}
$name = "<pre pre-tag-{$i}></pre>";
$preTags[$name] = substr($part, $start) . '</pre>';
$value .= substr($part, 0, $start) . $name;
$i++;
}
$value .= $last;
}
// Replace consecutive <br>s with a double line break for paragraphing
$value = preg_replace('|<br\\s*/?>\\s*<br\\s*/?>|', "\n\n", $value);
// Single line break before, double line break after all block elements
$allBlocks = '(?:' . implode('|', self::$BLOCK_ELEMENTS) . ')';
$value = preg_replace('!(<' . $allBlocks . '[\\s/>])!', "\n\$1", $value);
$value = preg_replace('!(</' . $allBlocks . '>)!', "\$1\n\n", $value);
// Placehold newlines within tags
$value = HTMLSplitHelper::replaceInTags($value, array("\n" => self::NEWLINE_PLACEHOLDER_FLAG));
if (strpos($value, '<option') !== false) {
// collapse line breaks around <option>s
$value = preg_replace('|\\s*<option|', '<option', $value);
$value = preg_replace('|</option>\\s*|', '</option>', $value);
}
if (strpos($value, '</object>') !== false) {
// collapse line breaks within <object>s
$value = preg_replace('|(<object[^>]*>)\\s*|', '$1', $value);
$value = preg_replace('|\\s*</object>|', '</object>', $value);
$value = preg_replace('%\\s*(</?(?:param|embed)[^>]*>)\\s*%', '$1', $value);
}
if (strpos($value, '<source') !== false || strpos($value, '<track') !== false) {
// collapse line breaks within <audio>s and <video>s
$value = preg_replace('%([<\\[](?:audio|video)[^>\\]]*[>\\]])\\s*%', '$1', $value);
$value = preg_replace('%\\s*([<\\[]/(?:audio|video)[>\\]])%', '$1', $value);
$value = preg_replace('%\\s*(<(?:source|track)[^>]*>)\\s*%', '$1', $value);
}
// Remove more than two consecutive line breaks
$value = preg_replace("/\n\n+/", "\n\n", $value);
$valueSplit = preg_split("/\n\\s*\n/", $value, -1, PREG_SPLIT_NO_EMPTY);
$value = '';
foreach ($valueSplit as $p) {
$value .= '<p>' . trim($p, "\n") . "</p>\n";
}
// Remove paragraphs that contain only whitespace
$value = preg_replace('|<p>\\s*</p>|', '', $value);
// Add missing closing <p>s inside <div>, <address>, or <form>
$value = preg_replace('!<p>([^<]+)</(div|address|form)>!', "<p>\$1</p></\$2>", $value);
// Remove <p>s wrapped around block element tags
$value = preg_replace('!<p>\\s*(</?' . $allBlocks . '[^>]*>)\\s*</p>!', '$1', $value);
// Remove <p>s wrapped around <li>s
$value = preg_replace('|<p>(<li.+?)</p>|', '$1', $value);
// Move <p>s inside <blockquote>s
$value = preg_replace('|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $value);
$value = str_replace('</blockquote></p>', '</p></blockquote>', $value);
// Remove <p>s before or after opening or closing block element tags
$value = preg_replace('!<p>\\s*(</?' . $allBlocks . '[^>]*>)!', '$1', $value);
$value = preg_replace('!(</?' . $allBlocks . '[^>]*>)\\s*</p>!', '$1', $value);
if ($this->convertBr) {
// Preserve newlines in <script> and <style>
$value = preg_replace_callback('/<(script|style).*?<\\/\\1>/s', function ($matches) {
return str_replace("\n", "<!-- preserveNewline -->", $matches[0]);
}, $value);
// Normalize <br />s
$value = str_replace(array('<br>', '<br/>'), '<br />', $value);
// Replace newlines that don't follow a <br /> with <br />
$value = preg_replace('|(?<!<br />)\\s*\\n|', "<br />\n", $value);
// Restore preserved newlines
$value = str_replace('<!-- preserveNewline -->', "\n", $value);
}
// Remove <br />s after opening or closing block tags
$value = preg_replace('!(</?' . $allBlocks . '[^>]*>)\\s*<br />!', '$1', $value);
// Remove <br />s before certain opening or closing tags
$value = preg_replace('!<br />(\\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $value);
$value = preg_replace('|\\n</p>$|', '</p>', $value);
if (!empty($preTags)) {
// Restore <pre>s
$value = str_replace(array_keys($preTags), array_values($preTags), $value);
}
// Restore newlines
if (strpos($value, self::NEWLINE_PLACEHOLDER_FLAG) !== false) {
$value = str_replace(self::NEWLINE_PLACEHOLDER_FLAG, "\n", $value);
}
return trim($value);
}
/**
* Performs formatting conversions and replacements on a string. Extracted
* from WordPress' `wptexturize()`.
*
* @param string $value string to be formatted
* @return string formatted string
* @see https://core.trac.wordpress.org/browser/tags/4.4.2/src/wp-includes/formatting.php#L41
*/
protected function texturize($value)
{
$noTexturizeTagStack = [];
preg_match_all('@\\[/?([^<>&/\\[\\]\\x00-\\x20=]++)@', $value, $tagNames);
$tagNames = $tagNames[1];
$valueSplit = HTMLSplitHelper::splitHtml($value, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
foreach ($valueSplit as &$chunk) {
if ($chunk[0] === '<') {
if (substr($chunk, 0, 4 === '<!--')) {
// HTML comment
continue;
} else {
// HTML element
$chunk = preg_replace(self::AMPERSAND_ENTITY_PATTERN, '&', $chunk);
$this->pushPopElement($chunk, $noTexturizeTagStack);
}
} elseif (trim($chunk) === '') {
// newline between delimiters
continue;
} elseif (empty($noTexturizeTagStack)) {
$chunk = strtr($chunk, $this->staticTranslations);
if (strpos($chunk, "'") !== false) {
$chunk = preg_replace(array_keys($this->dynamicTranslations['singleQuotes']), array_values($this->dynamicTranslations['singleQuotes']), $chunk);
$chunk = $this->texturizePrimes($chunk, "'", $this->prime, $this->leftSingleQuote, $this->rightSingleQuote);
}
if (strpos($chunk, '"') !== false) {
$chunk = preg_replace(array_keys($this->dynamicTranslations['doubleQuotes']), array_values($this->dynamicTranslations['doubleQuotes']), $chunk);
$chunk = $this->texturizePrimes($chunk, '"', $this->doublePrime, $this->leftDoubleQuote, $this->rightDoubleQuote);
}
if (strpos($chunk, '-') !== false) {
$chunk = preg_replace(array_keys($this->dynamicTranslations['dashes']), array_values($this->dynamicTranslations['dashes']), $chunk);
}
if (preg_match('/(?<=\\d)x\\d/', $chunk) === 1) {
$chunk = preg_replace('/\\b(\\d(?(?<=0)[\\d\\.,]+|[\\d\\.,]*))x(\\d[\\d\\.,]*)\\b/', '$1×$2', $chunk);
}
$chunk = preg_replace(self::AMPERSAND_ENTITY_PATTERN, '&', $chunk);
}
}
return implode('', $valueSplit);
}
