*/
class Markdown extends Parser
{
// include block element parsing using traits
use block\CodeTrait;
use block\HeadlineTrait;
use block\HtmlTrait {
parseInlineHtml as private;
}
use block\ListTrait {
// Check Ul List before headline
identifyUl as protected identifyBUl;
consumeUl as protected consumeBUl;
}
use block\QuoteTrait;
use block\RuleTrait {
// Check Hr before checking lists
identifyHr as protected identifyAHr;
consumeHr as protected consumeAHr;
}
// include inline element parsing using traits
use inline\CodeTrait;
use inline\EmphStrongTrait;
use inline\LinkTrait;
/**
* @var boolean whether to format markup according to HTML5 spec.
* Defaults to `false` which means that markup is formatted as HTML4.
*/
public $html5 = false;
/**
* @var array these are "escapeable" characters. When using one of these prefixed with a
* backslash, the character will be outputted without the backslash and is not interpreted
* as markdown.
*/
protected $escapeCharacters = [
'\\', // backslash
'`', // backtick
'*', // asterisk
'_', // underscore
'{', '}', // curly braces
'[', ']', // square brackets
'(', ')', // parentheses
'#', // hash mark
'+', // plus sign
'-', // minus sign (hyphen)
'.', // dot
'!', // exclamation mark
'<', '>',
];
/**
* @inheritDoc
*/
protected function prepare()
{
// reset references
$this->references = [];
}
/**
* Consume lines for a paragraph
*
* Allow headlines and code to break paragraphs
*/
protected function consumeParagraph($lines, $current)
{
// consume until newline
$content = [];
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = $lines[$i];
// a list may break a paragraph when it is inside of a list
if (isset($this->context[1]) && $this->context[1] === 'list' && !ctype_alpha($line[0]) && (
$this->identifyUl($line, $lines, $i) || $this->identifyOl($line, $lines, $i))) {
break;
}
if ($line === '' || ltrim($line) === '' || $this->identifyHeadline($line, $lines, $i)) {
break;
} elseif ($line[0] === "\t" || $line[0] === " " && strncmp($line, ' ', 4) === 0) {
// possible beginning of a code block
// but check for continued inline HTML
// e.g. 
if (preg_match('~<\w+([^>]+)$~s', implode("\n", $content))) {
$content[] = $line;
} else {
break;
}
} else {
$content[] = $line;
}
}
$block = [
'paragraph',
'content' => $this->parseInline(implode("\n", $content)),
];
return [$block, --$i];
}
/**
* @inheritdocs
*
* Parses a newline indicated by two spaces on the end of a markdown line.
*/
protected function renderText($text)
{
return str_replace(" \n", $this->html5 ? "
\n" : "
\n", $text[1]);
}
}