HtmlTrait.php
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<?php
/**
* @copyright Copyright (c) 2014 Carsten Brandt
* @license https://github.com/cebe/markdown/blob/master/LICENSE
* @link https://github.com/cebe/markdown#readme
*/
namespace cebe\markdown\block;
/**
* Adds inline and block HTML support
*/
trait HtmlTrait
{
/**
* @var array HTML elements considered as inline elements.
* @see http://www.w3.org/wiki/HTML/Elements#Text-level_semantics
*/
protected $inlineHtmlElements = [
'a', 'abbr', 'acronym',
'b', 'basefont', 'bdo', 'big', 'br', 'button', 'blink',
'cite', 'code',
'del', 'dfn',
'em',
'font',
'i', 'img', 'ins', 'input', 'iframe',
'kbd',
'label', 'listing',
'map', 'mark',
'nobr',
'object',
'q',
'rp', 'rt', 'ruby',
's', 'samp', 'script', 'select', 'small', 'spacer', 'span', 'strong', 'sub', 'sup',
'tt', 'var',
'u',
'wbr',
'time',
];
/**
* @var array HTML elements known to be self-closing.
*/
protected $selfClosingHtmlElements = [
'br', 'hr', 'img', 'input', 'nobr',
];
/**
* identify a line as the beginning of a HTML block.
*/
protected function identifyHtml($line, $lines, $current)
{
if ($line[0] !== '<' || isset($line[1]) && $line[1] == ' ') {
return false; // no html tag
}
if (strncmp($line, '<!--', 4) === 0) {
return true; // a html comment
}
$gtPos = strpos($lines[$current], '>');
$spacePos = strpos($lines[$current], ' ');
if ($gtPos === false && $spacePos === false) {
return false; // no html tag
} elseif ($spacePos === false) {
$tag = rtrim(substr($line, 1, $gtPos - 1), '/');
} else {
$tag = rtrim(substr($line, 1, min($gtPos, $spacePos) - 1), '/');
}
if (!ctype_alnum($tag) || in_array(strtolower($tag), $this->inlineHtmlElements)) {
return false; // no html tag or inline html tag
}
return true;
}
/**
* Consume lines for an HTML block
*/
protected function consumeHtml($lines, $current)
{
$content = [];
if (strncmp($lines[$current], '<!--', 4) === 0) { // html comment
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = $lines[$i];
$content[] = $line;
if (strpos($line, '-->') !== false) {
break;
}
}
} else {
$tag = rtrim(substr($lines[$current], 1, min(strpos($lines[$current], '>'), strpos($lines[$current] . ' ', ' ')) - 1), '/');
$level = 0;
if (in_array($tag, $this->selfClosingHtmlElements)) {
$level--;
}
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = $lines[$i];
$content[] = $line;
$level += substr_count($line, "<$tag") - substr_count($line, "</$tag>") - substr_count($line, "/>");
if ($level <= 0) {
break;
}
}
}
$block = [
'html',
'content' => implode("\n", $content),
];
return [$block, $i];
}
/**
* Renders an HTML block
*/
protected function renderHtml($block)
{
return $block['content'] . "\n";
}
/**
* Parses an & or a html entity definition.
* @marker &
*/
protected function parseEntity($text)
{
// html entities e.g. © © ©
if (preg_match('/^&#?[\w\d]+;/', $text, $matches)) {
return [['inlineHtml', $matches[0]], strlen($matches[0])];
} else {
return [['text', '&'], 1];
}
}
/**
* renders a html entity.
*/
protected function renderInlineHtml($block)
{
return $block[1];
}
/**
* Parses inline HTML.
* @marker <
*/
protected function parseInlineHtml($text)
{
if (strpos($text, '>') !== false) {
if (preg_match('~^</?(\w+\d?)( .*?)?>~s', $text, $matches)) {
// HTML tags
return [['inlineHtml', $matches[0]], strlen($matches[0])];
} elseif (preg_match('~^<!--.*?-->~s', $text, $matches)) {
// HTML comments
return [['inlineHtml', $matches[0]], strlen($matches[0])];
}
}
return [['text', '<'], 1];
}
/**
* Escapes `>` characters.
* @marker >
*/
protected function parseGt($text)
{
return [['text', '>'], 1];
}
}