_blocks = preg_split('@\\s+@', $this->_blocks);
$this->_descendList = preg_split('@\\s+@', $this->_descendList);
$this->_alterList = preg_split('@\\s+@', $this->_alterList);
$this->_inlines = preg_split('@\\s+@', $this->_inlines);
$this->_unique = md5(__FILE__);
}
/**
* Create wrapper P and BR elements in HTML depending on newlines. Useful when
* users use newlines to signal line and paragraph breaks. In all cases output
* should be well-formed markup.
*
* In DIV, LI, TD, and TH elements, Ps are only added when their would be at
* least two of them.
*
* @param string $html snippet
* @return string|false output or false if parse error occurred
*/
public function process($html) {
// normalize whitespace
$html = str_replace(array("\r\n", "\r"), "\n", $html);
// allows preserving entities untouched
$html = str_replace('&', $this->_unique . 'AMP', $html);
$this->_doc = new DOMDocument();
// parse to DOM, suppressing loadHTML warnings
// http://www.php.net/manual/en/domdocument.loadhtml.php#95463
libxml_use_internal_errors(true);
// Do not load entities. May be unnecessary, better safe than sorry
$disable_load_entities = libxml_disable_entity_loader(true);
if (!$this->_doc->loadHTML("{$html}"
. "")) {
libxml_disable_entity_loader($disable_load_entities);
return false;
}
libxml_disable_entity_loader($disable_load_entities);
$this->_xpath = new DOMXPath($this->_doc);
// start processing recursively at the BODY element
$nodeList = $this->_xpath->query('//body[1]');
$this->addParagraphs($nodeList->item(0));
// serialize back to HTML
$html = $this->_doc->saveHTML();
// Note: we create elements, which will later be converted to paragraphs
// split AUTOPs into multiples at /\n\n+/
$html = preg_replace('/(' . $this->_unique . 'NL){2,}/', '', $html);
$html = str_replace(array($this->_unique . 'BR', $this->_unique . 'NL', '
'),
'
',
$html);
$html = str_replace('
', '', $html);
// re-parse so we can handle new AUTOP elements
// Do not load entities. May be unnecessary, better safe than sorry
$disable_load_entities = libxml_disable_entity_loader(true);
if (!$this->_doc->loadHTML($html)) {
libxml_disable_entity_loader($disable_load_entities);
return false;
}
libxml_disable_entity_loader($disable_load_entities);
// must re-create XPath object after DOM load
$this->_xpath = new DOMXPath($this->_doc);
// strip AUTOPs that only have comments/whitespace
foreach ($this->_xpath->query('//autop') as $autop) {
/* @var DOMElement $autop */
$hasContent = false;
if (trim($autop->textContent) !== '') {
$hasContent = true;
} else {
foreach ($autop->childNodes as $node) {
if ($node->nodeType === XML_ELEMENT_NODE) {
$hasContent = true;
break;
}
}
}
if (!$hasContent) {
// mark to be later replaced w/ preg_replace (faster than moving nodes out)
$autop->setAttribute("r", "1");
}
}
// If a DIV contains a single AUTOP, remove it
foreach ($this->_xpath->query('//div') as $el) {
/* @var DOMElement $el */
$autops = $this->_xpath->query('./autop', $el);
if ($autops->length === 1) {
$firstAutop = $autops->item(0);
/* @var DOMElement $firstAutop */
$firstAutop->setAttribute("r", "1");
}
}
$html = $this->_doc->saveHTML();
// trim to the contents of BODY
$bodyStart = strpos($html, '');
$bodyEnd = strpos($html, '', $bodyStart + 6);
$html = substr($html, $bodyStart + 6, $bodyEnd - $bodyStart - 6);
// strip AUTOPs that should be removed
$html = preg_replace('@(.*?)@', '\\1', $html);
// commit to converting AUTOPs to Ps
$html = str_replace('', "\n", $html);
$html = str_replace('
', "\n", $html);
$html = str_replace('
', '
', $html);
$html = str_replace($this->_unique . 'AMP', '&', $html);
return $html;
}
/**
* Add P and BR elements as necessary
*
* @param DOMElement $el DOM element
* @return void
*/
protected function addParagraphs(DOMElement $el) {
// no need to call recursively, just queue up
$elsToProcess = array($el);
$inlinesToProcess = array();
while ($el = array_shift($elsToProcess)) {
// if true, we can alter all child nodes, if not, we'll just call
// addParagraphs on each element in the descendInto list
$alterInline = in_array($el->nodeName, $this->_alterList);
// inside affected elements, we want to trim leading whitespace from
// the first text node
$ltrimFirstTextNode = true;
// should we open a new AUTOP element to move inline elements into?
$openP = true;
$autop = null;
// after BR, ignore a newline
$isFollowingBr = false;
$node = $el->firstChild;
while (null !== $node) {
if ($alterInline) {
if ($openP) {
$openP = false;
// create a P to move inline content into (this may be removed later)
$autop = $el->insertBefore($this->_doc->createElement('autop'), $node);
}
}
$isElement = ($node->nodeType === XML_ELEMENT_NODE);
if ($isElement) {
$isBlock = in_array($node->nodeName, $this->_blocks);
} else {
$isBlock = false;
}
if ($alterInline) {
$isText = ($node->nodeType === XML_TEXT_NODE);
$isLastInline = (! $node->nextSibling
|| ($node->nextSibling->nodeType === XML_ELEMENT_NODE
&& in_array($node->nextSibling->nodeName, $this->_blocks)));
if ($isElement) {
$isFollowingBr = ($node->nodeName === 'br');
}
if ($isText) {
$nodeText = $node->nodeValue;
if ($ltrimFirstTextNode) {
$nodeText = ltrim($nodeText);
$ltrimFirstTextNode = false;
}
if ($isFollowingBr && preg_match('@^[ \\t]*\\n[ \\t]*@', $nodeText, $m)) {
// if a user ends a line with
, don't add a second BR
$nodeText = substr($nodeText, strlen($m[0]));
}
if ($isLastInline) {
$nodeText = rtrim($nodeText);
}
$nodeText = str_replace("\n", $this->_unique . 'NL', $nodeText);
$tmpNode = $node;
$node = $node->nextSibling; // move loop to next node
// alter node in place, then move into AUTOP
$tmpNode->nodeValue = $nodeText;
$autop->appendChild($tmpNode);
continue;
}
}
if ($isBlock || ! $node->nextSibling) {
if ($isBlock) {
if (in_array($node->nodeName, $this->_descendList)) {
$elsToProcess[] = $node;
//$this->addParagraphs($node);
}
}
$openP = true;
$ltrimFirstTextNode = true;
}
if ($alterInline) {
if (! $isBlock) {
$tmpNode = $node;
if ($isElement && false !== strpos($tmpNode->textContent, "\n")) {
$inlinesToProcess[] = $tmpNode;
}
$node = $node->nextSibling;
$autop->appendChild($tmpNode);
continue;
}
}
$node = $node->nextSibling;
}
}
// handle inline nodes
// no need to recurse, just queue up
while ($el = array_shift($inlinesToProcess)) {
$ignoreLeadingNewline = false;
foreach ($el->childNodes as $node) {
if ($node->nodeType === XML_ELEMENT_NODE) {
if ($node->nodeValue === 'BR') {
$ignoreLeadingNewline = true;
} else {
$ignoreLeadingNewline = false;
if (false !== strpos($node->textContent, "\n")) {
$inlinesToProcess[] = $node;
}
}
continue;
} elseif ($node->nodeType === XML_TEXT_NODE) {
$text = $node->nodeValue;
if ($text[0] === "\n" && $ignoreLeadingNewline) {
$text = substr($text, 1);
$ignoreLeadingNewline = false;
}
$node->nodeValue = str_replace("\n", $this->_unique . 'BR', $text);
}
}
}
}
}