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