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<?php |
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namespace BaoPham\TreeParser; |
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class TreeParser |
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{ |
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private $indentation = 2; |
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/** |
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* @var string |
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*/ |
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private $tree; |
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/** |
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* @var int |
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*/ |
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private $initialSpaces; |
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/** |
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* @var array |
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*/ |
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private $structure; |
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/** |
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* @var array |
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*/ |
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private $orderedNodes; |
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/** |
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* TreeParser constructor. |
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* @param string $tree |
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* |
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* <<<TREE |
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* Root |
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* |- Level 1 - Order 1 |
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* |- Level 2 - Order 2 |
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* |- Level 3 - Order 3 |
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* |- Level 3 - Order 4 |
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* |- Level 2 - Order 5 |
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* |- Level 1 - Order 6 |
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* |- Level 2 - Order 7 |
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* |- Level 3 - Order 8 |
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* |- Level 4 - Order 9 |
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* TREE; |
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*/ |
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public function __construct($tree) |
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{ |
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$this->tree = $tree; |
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} |
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public function parse() |
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{ |
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$lines = explode(PHP_EOL, $this->tree); |
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$this->setStructureAndOrderedNodes($lines); |
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$root = $this->structure[TreeNode::ROOT_LEVEL][TreeNode::ROOT_ORDER]; |
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foreach ($this->orderedNodes as $node) { |
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if ($node->isRoot) { |
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continue; |
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} |
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$parent = $this->getParentForNode($node); |
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$parent->children[] = $node; |
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$node->parent = $parent; |
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} |
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return $root; |
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} |
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public function setTree($tree) |
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{ |
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$this->tree = $tree; |
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} |
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public function getTree() |
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{ |
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return $this->tree; |
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} |
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/** |
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* @return array |
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*/ |
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public function getOrderedNodes() |
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{ |
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return $this->orderedNodes; |
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} |
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/** |
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* @return array |
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*/ |
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public function getStructure() |
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{ |
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return $this->structure; |
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} |
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/** |
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* @param int $indentation |
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* @return TreeParser |
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*/ |
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public function setIndentation($indentation) |
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{ |
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$this->indentation = $indentation; |
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return $this; |
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} |
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/** |
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* @param TreeNode $node |
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* @return TreeNode|null |
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*/ |
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public function getParentForNode(TreeNode $node) |
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{ |
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if ($node->level === TreeNode::ROOT_LEVEL) { |
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return null; |
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} |
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$parentLevel = $node->level - 1; |
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$candidates = $this->structure[$parentLevel]; |
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$order = $node->order - 1; |
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while ($order >= TreeNode::ROOT_ORDER) { |
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if (isset($candidates[$order])) { |
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return $candidates[$order]; |
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} |
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--$order; |
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} |
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} |
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/** |
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* @param $line |
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* @return int |
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*/ |
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private function numberOfSpaces($line) |
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{ |
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return strspn($line, ' '); |
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} |
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/** |
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* @param $numberOfSpaces |
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* @return int |
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* @throws InvalidNumberOfSpaces |
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*/ |
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private function spacesToLevel($numberOfSpaces) |
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{ |
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if ($numberOfSpaces === $this->initialSpaces) { |
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return 0; |
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} |
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if (($numberOfSpaces - $this->initialSpaces) % $this->indentation !== 0) { |
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throw new InvalidNumberOfSpaces( |
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"Make sure children's leading spaces being a multiple of {$this->indentation}" |
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); |
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} |
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return (int) ($numberOfSpaces - $this->initialSpaces) / $this->indentation; |
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} |
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private function lineToNode($line) |
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{ |
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$line = trim($line); |
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$line = ltrim($line, '|-'); |
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$line = trim($line); |
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$node = new TreeNode(); |
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$node->name = $line; |
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return $node; |
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} |
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private function setStructureAndOrderedNodes(array $lines) |
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{ |
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$this->orderedNodes = []; |
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$this->initialSpaces = null; |
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$this->structure = []; |
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foreach ($lines as $order => $line) { |
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$node = $this->lineToNode($line); |
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if ($this->initialSpaces === null) { |
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$this->initialSpaces = $this->numberOfSpaces($line); |
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$node->isRoot = true; |
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} |
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$node->order = (int) $order; |
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$node->level = $this->spacesToLevel($this->numberOfSpaces($line)); |
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$this->structure[$node->level][$node->order] = $node; |
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$this->orderedNodes[] = $node; |
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} |
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} |
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} |
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baopham /
php-tree-parser
