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<?php |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js) |
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* - (c) John MacFarlane |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Block\Parser; |
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use League\CommonMark\Block\Element\ListBlock; |
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use League\CommonMark\Block\Element\ListData; |
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use League\CommonMark\Block\Element\ListItem; |
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use League\CommonMark\ContextInterface; |
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use League\CommonMark\Cursor; |
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use League\CommonMark\Util\RegexHelper; |
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class ListParser extends AbstractBlockParser |
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{ |
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/** |
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* @param ContextInterface $context |
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* @param Cursor $cursor |
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* |
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* @return bool |
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*/ |
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public function parse(ContextInterface $context, Cursor $cursor) |
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{ |
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if ($cursor->isIndented() && !($context->getContainer() instanceof ListBlock)) { |
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return false; |
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} |
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$tmpCursor = clone $cursor; |
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$indent = $tmpCursor->advanceToFirstNonSpace(); |
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$rest = $tmpCursor->getRemainder(); |
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$data = new ListData(); |
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$data->markerOffset = $cursor->getIndent(); |
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if ($matches = RegexHelper::matchAll('/^[*+-]/', $rest)) { |
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$data->type = ListBlock::TYPE_UNORDERED; |
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$data->delimiter = null; |
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$data->bulletChar = $matches[0][0]; |
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} elseif ($matches = RegexHelper::matchAll('/^(\d{1,9})([.)])/', $rest)) { |
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$data->type = ListBlock::TYPE_ORDERED; |
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$data->start = intval($matches[1]); |
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$data->delimiter = $matches[2]; |
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$data->bulletChar = null; |
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} else { |
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return false; |
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} |
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$markerLength = strlen($matches[0]); |
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// Make sure we have spaces after |
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$nextChar = $tmpCursor->peek($markerLength); |
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if (!($nextChar === null || $nextChar === "\t" || $nextChar === ' ')) { |
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return false; |
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} |
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// We've got a match! Advance offset and calculate padding |
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$cursor->advanceToFirstNonSpace(); // to start of marker |
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$cursor->advanceBy($markerLength, true); // to end of marker |
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$data->padding = $this->calculateListMarkerPadding($cursor, $markerLength, $data); |
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// add the list if needed |
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$container = $context->getContainer(); |
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if (!$container || !($context->getContainer() instanceof ListBlock) || !$data->equals($container->getListData())) { |
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$context->addBlock(new ListBlock($data)); |
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} |
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// add the list item |
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$context->addBlock(new ListItem($data)); |
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return true; |
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} |
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/** |
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* @param Cursor $cursor |
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* @param int $markerLength |
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* |
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* @return int |
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*/ |
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private function calculateListMarkerPadding(Cursor $cursor, $markerLength) |
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{ |
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$start = $cursor->saveState(); |
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$spacesStartCol = $cursor->getColumn(); |
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$spacesStartOffset = $cursor->getPosition(); |
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do { |
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$cursor->advanceBy(1, true); |
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$nextChar = $cursor->getCharacter(); |
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} while ($cursor->getColumn() - $spacesStartCol < 5 && ($nextChar === ' ' || $nextChar === "\t")); |
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$blankItem = $cursor->peek() === null; |
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$spacesAfterMarker = $cursor->getColumn() - $spacesStartCol; |
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if ($spacesAfterMarker >= 5 || $spacesAfterMarker < 1 || $blankItem) { |
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$cursor->restoreState($start); |
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if ($cursor->peek() === ' ') { |
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$cursor->advanceBy(1, true); |
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} |
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return $markerLength + 1; |
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} else { |
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return $markerLength + $spacesAfterMarker; |
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} |
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} |
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} |
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.