Funivan\PhpTokenizer\Collection

Complexity

Total Complexity

59

Size/Duplication

Total Lines	502
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	3

Test Coverage

Coverage

100%

Importance

Changes

0

35 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	6	2
A	__clone()	0	7	2
A	__toString()	0	3	1
A	createFromString()	0	4	1
A	count()	0	3	1
A	prepend()	0	4	1
A	append()	0	4	1
B	addAfter()	0	21	5
A	setItems()	0	11	3
A	slice()	0	4	1
A	extractItems()	0	4	1
A	rewind()	0	4	1
A	getLast()	0	4	2
A	getFirst()	0	4	2
A	getNext()	0	4	1
A	getPrevious()	0	4	1
A	current()	0	3	1
A	key()	0	3	1
A	next()	0	3	1
A	valid()	0	3	1
A	offsetSet()	0	17	4
A	offsetExists()	0	3	1
A	offsetUnset()	0	3	1
A	offsetGet()	0	3	2
A	getTokens()	0	3	1
A	each()	0	14	3
A	remove()	0	6	2
A	find()	0	4	1
A	refresh()	0	10	1
A	extractByTokens()	0	15	4
A	storeContentHash()	0	4	1
A	isChanged()	0	3	1
A	getContentHash()	0	3	1
A	assemble()	0	12	3
A	cleanCollection()	0	10	3

<?php

  declare(strict_types=1);

  namespace Funivan\PhpTokenizer;

  use Funivan\PhpTokenizer\Exception\Exception;
  use Funivan\PhpTokenizer\Query\Query;

  /**
   *
   */
  class Collection implements \Iterator, \ArrayAccess, \Countable {

    /**
     * @var int
     */
    protected $position = 0;

    /**
     * Array of objects
     *
     * @var array
     */
    protected $items = [];


    /**
     * @var string
     */
    protected $initialContentHash;


    /**
     * @param array $items
     */
    public function __construct(array $items = []) {
      if (!empty($items)) {
        $this->setItems($items);
      }
      $this->storeContentHash();
    }


    /**
     *
     */
    public function __clone() {
      $items = [];
      foreach ($this->items as $item) {
        $items[] = $item;
      }
      $this->setItems($items);
    }


    /**
     * Extract each value from token
     *
     * @return string
     */
    public function __toString() {
      return $this->assemble();
    }


    /**
     *
     * @param string $string
     * @return Collection
     * @throws Exception
     */
    public static function createFromString($string) : Collection {
      $tokens = Helper::getTokensFromString($string);
      return new Collection($tokens);
    }


    /**
     * Return number of items in this collection
     *
     * @return int
     */
    public function count() {
      return count($this->items);
    }


    /**
     * Add one item to begin of collection
     * This item is accessible via `$collection->getFirst();`
     *
     * @param $item
     * @return $this
     */
    public function prepend(Token $item) : self {
      array_unshift($this->items, $item);
      return $this;
    }


    /**
     * Add one item to the end of collection
     * This item is accessible via `$collection->getLast();`
     *
     * @param $item
     * @return $this
     */
    public function append(Token $item) : self {
      $this->items[] = $item;
      return $this;
    }


    /**
     * @param int $index
     * @param array $items
     * @return $this
     * @throws \InvalidArgumentException
     */
    public function addAfter($index, $items) : self {
      if (!is_array($items)) {
        throw new \InvalidArgumentException('You can add after only array of items');
      }

      foreach ($items as $item) {
        if (!($item instanceof Token)) {
          throw new \InvalidArgumentException('Expect array of tokens. Token[]');
        }
      }

      if (!is_int($index)) {
        throw new \InvalidArgumentException('Invalid type of index. Must be integer');
      }

      $offset = $index + 1;
      $firstPart = array_slice($this->items, 0, $offset);
      $secondPart = array_slice($this->items, $offset);
      $this->items = array_merge($firstPart, $items, $secondPart);
      return $this;
    }


    /**
     * Truncate current list of items and add new
     *
     * @param array $items
     * @return $this
     */
    public function setItems(array $items) : self {
      foreach ($items as $item) {
        if (!($item instanceof Token)) {
          throw new \InvalidArgumentException('Expect array of tokens. Token[]');
        }
      }

      $this->items = $items;
      $this->rewind();
      return $this;
    }


    /**
     * Remove part of items from collection
     * Works as array_slice
     *
     *
     * @param int $offset
     * @param int|null $length
     * @return $this
     */
    public function slice(int $offset, int $length = null) : self {
      $this->items = array_slice($this->items, $offset, $length);
      return $this;
    }


    /**
     * Take part of items and return new collection
     * Works as array_slice
     * At this point items in 2 collection is same
     *
     * @param int $offset
     * @param null $length
     * @return Collection
     */
    public function extractItems(int $offset, $length = null) : Collection {
      $items = array_slice($this->items, $offset, $length);
      return new Collection($items);
    }


    /**
     * Rewind current collection
     */
    public function rewind() {
      $this->position = 0;
      $this->items = array_values($this->items);
    }


    /**
     * Return last item from collection
     *
     * @return Token|null
     */
    public function getLast() {
      $lastToken = end($this->items);
      return ($lastToken !== false) ? $lastToken : null;
    }


    /**
     * Return first item from collection
     * @return Token|null
     */
    public function getFirst() {
      $first = reset($this->items);
      return $first !== false ? $first : null;
    }


    /**
     * Return next item from current
     * Also can return item with position from current + $step
     *
     * @param int $step
     * @return Token
     */
    public function getNext(int $step = 1) : Token {
      $position = ($this->position + $step);
      return $this->items[$position] ?? new Token();
    }


    /**
     * Return previous item
     * Also can return previous from current position + $step
     *
     * @param int $step
     * @return Token
     */
    public function getPrevious(int $step = 1) : Token {
      $position = ($this->position - $step);
      return ($this->items[$position]) ?? new Token();
    }


    /**
     * Return current item in collection
     *
     * @return Token
     */
    public function current() {
      return $this->items[$this->position];
    }


    /**
     * Return current position
     *
     * @return int
     */
    public function key() {
      return $this->position;
    }


    /**
     * Switch to next position
     */
    public function next() {
      ++$this->position;
    }


    /**
     * Check if item exist in current position
     *
     * @return bool
     */
    public function valid() : bool {
      return isset($this->items[$this->position]);
    }


    /**
     * Add item to the end or modify item with given key
     *
     * @param int|null $offset
     * @param Token $item
     * @return $this
     */
    public function offsetSet($offset, $item) {
      if (!($item instanceof Token)) {
        throw new \InvalidArgumentException('Expect Token object');
      }

      if (is_null($offset)) {
        $this->append($item);
        return $this;
      }

      if (!is_int($offset)) {
        throw new \InvalidArgumentException('Invalid type of index. Must be integer');
      }
      $this->items[$offset] = $item;

      return $this;
    }


    /**
     * Check if item with given offset exists
     *
     * @param int $offset
     * @return bool
     */
    public function offsetExists($offset) {
      return isset($this->items[$offset]);
    }


    /**
     * Remove item from collection
     *
     * @param int $offset
     */
    public function offsetUnset($offset) {
      unset($this->items[$offset]);
    }


    /**
     * Get item from collection
     *
     * @param int $offset
     * @return Token|null
     */
    public function offsetGet($offset) {
      return isset($this->items[$offset]) ? $this->items[$offset] : null;
    }


    /**
     * Return array of items connected to this collection
     *
     * Rewrite this method in you class
     *
     * <code>
     * foreach($collection->getTokens() as $item){
     *  echo get_class($item)."\n;
     * }
     * </code>
     * @return Token[]
     */
    public function getTokens() : array {
      return $this->items;
    }


    /**
     * Iterate over objects in collection
     *
     * <code>
     * $collection->each(function($item, $index, $collection){
     *    if ( $index > 0 ) {
     *      $item->remove();
     *    }
     * })
     * </code>
     *
     * @param callable $callback
     * @return $this
     * @throws \InvalidArgumentException
     */
    public function each(callable $callback) : self {

      if (!is_callable($callback)) {
        throw new \InvalidArgumentException('Invalid callback function');
      }

      foreach ($this->getTokens() as $index => $item) {
        call_user_func_array($callback, [$item, $index, $this]);
      }

      $this->rewind();

      return $this;
    }


    /**
     * Remove all tokens in collection
     *
     * @return $this
     */
    public function remove() : self {
      foreach ($this as $token) {
        $token->remove();
      }
      return $this;
    }


    /**
     * @param Query $query
     * @return Collection
     */
    public function find(Query $query) {
      $finder = new TokenFinder($this);
      return $finder->find($query);
    }


    /**
     * Remove all invalid tokens in collection
     * Refresh index.
     *
     * @return Collection
     */
    public function refresh() : self {
      $string = $this->assemble();
      $this->cleanCollection();

      $tokens = Helper::getTokensFromString($string);
      $this->setItems($tokens);

      $this->rewind();
      return $this;
    }


    /**
     * @param Token $tokenStart
     * @param Token $tokenEnd
     * @return Collection
     */
    public function extractByTokens(Token $tokenStart, Token $tokenEnd) : Collection {

      $collection = new Collection();
      $startIndex = $tokenStart->getIndex();
      $endIndex = $tokenEnd->getIndex();

      foreach ($this->getTokens() as $token) {
        if ($token->getIndex() >= $startIndex and $token->getIndex() <= $endIndex) {
          $collection->append($token);
        }
      }


      return $collection;
    }


    /**
     * @return $this
     */
    public function storeContentHash() : self {
      $this->initialContentHash = $this->getContentHash();
      return $this;
    }


    /**
     * @return bool
     */
    public function isChanged() : bool {
      return ($this->getContentHash() !== $this->initialContentHash);
    }


    /**
     * @return string
     */
    private function getContentHash() : string {
      return md5($this->assemble());
    }


    /**
     * @return string
     */
    public function assemble() : string {
      $string = '';
      /** @var Token $token */
      foreach ($this as $token) {
        if (!$token->isValid()) {
          continue;
        }
        $string .= $token->getValue();
      }

      return $string;
    }


    /**
     * Remove invalid tokens from collection
     *
     * @return $this
     */
    protected function cleanCollection() : self {
      foreach ($this as $index => $token) {
        if ($token->isValid()) {
          continue;
        }
        unset($this->items[$index]);
      }

      return $this;
    }

  }