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ListTrait.php
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ListTrait.php
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<?php
/**
* @copyright Copyright (c) 2015 Nobuo Kihara
* @license https://github.com/softark/creole/blob/master/LICENSE
* @link https://github.com/softark/creole#readme
*/
namespace softark\creole\block;
/**
* Adds the list blocks
*/
trait ListTrait
{
/**
* @var int the current depth of the nested lists
*/
private $_listDepth = 1;
/**
* @var array the types of the nested lists
*/
private $_nestedListTypes = [];
/**
* Identify a line as the beginning of an ordered list.
* It should start with '#', with leading white spaces permitted.
*/
protected function identifyOl($line)
{
return preg_match('/^\s*#{' . $this->_listDepth . '}[^#]+/', $line);
}
/**
* Identify a line as the beginning of an unordered list.
* It should start with '*', with leading white spaces permitted.
*/
protected function identifyUl($line)
{
return preg_match('/^\s*\*{' . $this->_listDepth . '}[^\*]+/', $line);
}
/**
* check if a line is an item that belongs to a parent list
* @param $line
* @return bool true if the line is an item of a parent list
*/
protected function isParentItem($line)
{
if ($this->_listDepth === 1 || ($marker = $line[0]) !== '*' && $marker !== '#') {
return false;
}
$depthMax = $this->_listDepth - 1;
if (preg_match('/^(#{1,' . $depthMax . '})[^#]+/', $line, $matches)) {
return $this->_nestedListTypes[strlen($matches[1])] === 'ol';
}
if (preg_match('/^(\*{1,' . $depthMax . '})[^\*]+/', $line, $matches)) {
return $this->_nestedListTypes[strlen($matches[1])] === 'ul';
}
return false;
}
/**
* check if a line is an item that belongs to a sibling list
* @param $line
* @return bool true if the line is an item of a sibling list
*/
protected function isSiblingItem($line)
{
$siblingMarker = $this->_nestedListTypes[$this->_listDepth] == 'ol' ? '*' : '#';
if ($line[0] !== $siblingMarker) {
return false;
}
return
($siblingMarker === '#' && preg_match('/^#{' . $this->_listDepth . '}[^#]+/', $line)) ||
($siblingMarker === '*' && preg_match('/^\*{' . $this->_listDepth . '}[^\*]+/', $line));
}
/**
* Consume lines for an ordered list
*/
protected function consumeOl($lines, $current)
{
// consume until newline
$block = [
'list',
'list' => 'ol',
'items' => [],
];
return $this->consumeList($lines, $current, $block, 'ol');
}
/**
* Consume lines for an unordered list
*/
protected function consumeUl($lines, $current)
{
// consume until newline
$block = [
'list',
'list' => 'ul',
'items' => [],
];
return $this->consumeList($lines, $current, $block, 'ul');
}
private function consumeList($lines, $current, $block, $type)
{
$this->_nestedListTypes[$this->_listDepth] = $type;
$item = 0;
$pattern = $type === 'ul' ? '/^\*{' . $this->_listDepth . '}([^\*]+.*|)$/' : '/^#{' . $this->_listDepth . '}([^#]+.*|)$/';
for ($i = $current, $count = count($lines); $i < $count; $i++) {
$line = ltrim($lines[$i]);
// A list ends with a blank new line, other block elements, a parent item, or a sibling list.
if ($line === '' ||
$this->identifyHeadline($line) ||
$this->identifyHr($line) ||
$this->identifyTable($line) ||
$this->identifyCode($line) ||
$this->isParentItem($line) ||
$this->isSiblingItem($line)
) {
// list ended
$i--;
break;
}
if (preg_match($pattern, $line)) {
// match list marker on the beginning of the line ... the next item begins
$line = ltrim(substr($line, $this->_listDepth));
$block['items'][++$item][] = $line;
} else {
// child list?
$this->_listDepth++;
if ($this->identifyOl($line)) {
list($childBlock, $i) = $this->consumeOl($lines, $i);
$block['items'][$item][] = $childBlock;
} elseif ($this->identifyUl($line)) {
list($childBlock, $i) = $this->consumeUl($lines, $i);
$block['items'][$item][] = $childBlock;
} else {
// the continuing content of the current item
$line = ltrim($line);
$block['items'][$item][] = $line;
}
$this->_listDepth--;
}
}
foreach ($block['items'] as $itemId => $itemLines) {
$content = [];
$texts = [];
foreach ($itemLines as $line) {
if (!isset($line['list'])) {
$texts[] = $line;
} else {
// child list
if (!empty($texts)) {
// text before child list
$content = array_merge($content, $this->parseInline(implode("\n", $texts)));
$texts = [];
}
$content[] = $line;
}
}
if (!empty($texts)) {
$content = array_merge($content, $this->parseInline(implode("\n", $texts)));
}
$block['items'][$itemId] = $content;
}
return [$block, $i];
}
/**
* Renders a list
*/
protected function renderList($block)
{
$type = $block['list'];
$output = "<$type>\n";
foreach ($block['items'] as $item => $itemLines) {
$output .= '<li>' . $this->renderAbsy($itemLines) . "</li>\n";
}
return $output . "</$type>\n";
}
abstract protected function parseInline($text);
abstract protected function renderAbsy($absy);
abstract protected function identifyHeadline($line);
abstract protected function identifyHr($line);
abstract protected function identifyTable($line);
abstract protected function identifyCode($line);
}