'ol',
'attr' => [],
'items' => [],
'loose' => false,
];
return $this->consumeList($lines, $current, $block, 'ol');
}
/**
* Consume lines for an unordered list.
*/
protected function consumeUl($lines, $current): array
{
$block = [
'list',
'list' => 'ul',
'items' => [],
'loose' => false,
];
return $this->consumeList($lines, $current, $block, 'ul');
}
private function consumeList($lines, $current, $block, $type): array
{
$item = 0;
$marker = '';
$mw = 0;
// Consume until end condition...
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = $lines[$i];
$pattern = ($type === 'ol') ?
'/^( {0,3})(\d{1,9})([\.\)])([ \t]+|$)/' :
'/^( {0,3})([\-\+\*])([ \t]+|$)/' ;
// If not the first item, marker indentation must be less than
// width of preceeding marker - otherwise it is a continuation
// of the current item containing a marker for a sub-list item.
if (
preg_match($pattern, $line, $matches)
&& ($i === $current || strlen($matches[1]) < $mw)
) {
if ($i === $current) {
// First item.
// Store the marker for comparison.
$marker = $type === 'ol' ?
$matches[3] : $matches[2] ;
// Set the ol start attribute.
if ($type === 'ol' && $this->keepListStartNumber) {
$start = intval($matches[2]);
if ($start !== 1) {
$block['attr']['start'] = $start;
}
}
} else {
$item++;
$newMarker = $type === 'ol' ?
$matches[3] : $matches[2] ;
// Marker has changed: end of list.
if (strcmp($marker, $newMarker) !== 0) {
--$i;
break;
}
}
$mw = strlen($matches[0]);
$line = substr($line, $mw);
$block['items'][$item][] = $line;
} elseif ($line === '' || ltrim($line) === '') {
// No more lines: end of list.
if (!isset($lines[$i + 1])) {
break;
}
$next = $lines[$i + 1];
$line = substr($line, $mw);
if ($next === '' || ltrim($next) === '') {
// Next line is also blank.
$block['items'][$item][] = $line;
} elseif (strspn($next, " \t") >= $mw) {
// Next line is indented enough to continue this item.
$block['items'][$item][] = $line;
} elseif (preg_match($pattern, $next)) {
// Next line is the next item in this list: loose list.
$block['items'][$item][] = $line;
$block['loose'] = true;
} else {
// next line is not list content.
break;
}
} elseif (
strlen($line) > $mw
&& strspn($line, " \t") >= $mw
) {
// Line is indented enough to continue this item.
$line = substr($line, $mw);
$block['items'][$item][] = $line;
} else {
// Everything else ends the list.
--$i;
break;
}
// If next line is
, end the list.
if (
!empty($lines[$i + 1])
&& method_exists($this, 'identifyHr')
&& $this->identifyHr($lines[$i + 1])
) {
break;
}
}
// Tight list? check it...
if (!$block['loose']) {
foreach ($block['items'] as $itemLines) {
// Empty list item.
if (ltrim($itemLines[0]) === '' && !isset($itemLines[1])) {
continue;
}
// Everything else.
for ($x = 0; $x < count($itemLines); $x++) {
if (
ltrim($itemLines[$x]) === ''
|| $this->detectLineType($itemLines, $x) !== 'paragraph'
) {
// Blank line or non-paragraph block marker detected:
// make the list loose because block parsing is required.
$block['loose'] = true;
break 2;
}
}
}
}
foreach ($block['items'] as $itemId => $itemLines) {
$block['items'][$itemId] = $block['loose'] ?
$this->parseBlocks($itemLines) :
$this->parseInline(implode("\n", $itemLines)) ;
}
return [$block, $i];
}
/**
* Renders a list.
*/
protected function renderList($block): string
{
$type = $block['list'];
$li = $block['loose'] ? "\n" : '';
if (!empty($block['attr'])) {
$output = "<$type "
. $this->generateHtmlAttributes($block['attr'])
. ">\n";
} else {
$output = "<$type>\n";
}
foreach ($block['items'] as $item => $itemLines) {
$output .= $li . $this->renderAbsy($itemLines). "\n";
}
return $output . "\n";
}
/**
* Return HTML attributes string from [attrName => attrValue] list.
*
* @param array $attributes - The attribute name-value pairs.
* @return string
*/
private function generateHtmlAttributes($attributes): string
{
foreach ($attributes as $name => $value) {
$attributes[$name] = "$name=\"$value\"";
}
return implode(' ', $attributes);
}
abstract protected function parseBlocks($lines);
abstract protected function parseInline($text);
abstract protected function renderAbsy($absy);
abstract protected function detectLineType($lines, $current);
}