Funivan\PhpTokenizer\QuerySequence\QuerySequence

Complexity

Total Complexity

38

Size/Duplication

Total Lines	312
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	11

Test Coverage

Coverage

93.14%

Importance

Changes

0

18 Methods

Rating	Name	Duplication	Size	Complexity
A	moveToToken()	0	20	4
A	__construct()	0	4	1
A	getCollection()	0	3	1
A	setPosition()	0	4	1
A	getPosition()	0	3	1
A	strict()	0	4	1
A	possible()	0	4	1
A	section()	0	19	3
A	search()	0	8	2
A	move()	0	3	1
A	sequence()	0	8	2
A	checkFromSequence()	0	9	2
C	process()	0	28	7
B	buildStrategyCondition()	0	26	5
A	setValid()	0	7	2
A	getToken()	0	10	2
A	isValid()	0	3	1
A	setSkipWhitespaces()	0	4	1

<?php

  declare(strict_types=1);

  namespace Funivan\PhpTokenizer\QuerySequence;

  use Funivan\PhpTokenizer\Collection;
  use Funivan\PhpTokenizer\Exception\InvalidArgumentException;
  use Funivan\PhpTokenizer\Strategy\Move;
  use Funivan\PhpTokenizer\Strategy\Possible;
  use Funivan\PhpTokenizer\Strategy\QueryStrategy;
  use Funivan\PhpTokenizer\Strategy\Search;
  use Funivan\PhpTokenizer\Strategy\StrategyInterface;
  use Funivan\PhpTokenizer\Strategy\Strict;
  use Funivan\PhpTokenizer\Token;

  /**
   * Start from specific position and check token from this position according to strategies
   */
  class QuerySequence implements QuerySequenceInterface {

    /**
     * @var bool
     */
    private $valid = true;

    /**
     * @var int
     */
    private $position;

    /**
     * @var Collection
     */
    private $collection;

    /**
     * @var
     */
    private $skipWhitespaces = false;


    /**
     * @inheritdoc
     */
    public function __construct(Collection $collection, $initialPosition = 0) {
      $this->collection = $collection;
      $this->position = $initialPosition;
    }


    /**
     * @return Collection
     */
    public function getCollection() {
      return $this->collection;
    }


    /**
     * @param int $position
     * @return QuerySequence
     */
    public function setPosition($position) {
      $this->position = $position;
      return $this;
    }


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


    /**
     * Strict validation of condition
     *
     * @param int|string|Strict $condition
     * @return Token
     */
    public function strict($condition) {
      $query = $this->buildStrategyCondition($condition, Strict::create());
      return $this->process($query);
    }


    /**
     * Check if token possible valid for our condition
     *
     * @param int|string|Possible $condition
     * @return Token
     */
    public function possible($condition) {
      $query = $this->buildStrategyCondition($condition, Possible::create());
      return $this->process($query);
    }


    /**
     * @param string $start
     * @param string $end
     * @return Collection
     */
    public function section($start, $end) {

      $token = $this->strict($start);
      if (!$token->isValid()) {
        # cant find start position
        return new Collection();
      }

      $this->moveToToken($token);

      $section = new \Funivan\PhpTokenizer\Strategy\Section();
      $section->setDelimiters($start, $end);
      $lastToken = $this->process($section);
      if (!$lastToken->isValid()) {
        return new Collection();
      }

      return $this->collection->extractByTokens($token, $lastToken);
    }


    /**
     * By default we search forward
     *
     * @param int|string|Search $condition
     * @param null $direction
     * @return Token
     */
    public function search($condition, $direction = null) {
      $strategy = Search::create();
      if ($direction !== null) {
        $strategy->setDirection($direction);
      }
      $query = $this->buildStrategyCondition($condition, $strategy);
      return $this->process($query);
    }


    /**
     * Relative move
     * +10 move forward 10 tokens
     * -5 move backward 5 tokens
     *
     * @param int $steps
     * @return Token
     */
    public function move($steps) {
      return $this->process(Move::create($steps));
    }


    /**
     * Move to specific position
     *
     * @param Token $token
     * @return Token|null
     */
    public function moveToToken(Token $token) {

      if (!$token->isValid()) {
        $this->setValid(false);
        return new Token();
      }

      $tokenIndex = $token->getIndex();


      foreach ($this->collection as $index => $collectionToken) {
        if ($collectionToken->getIndex() === $tokenIndex) {
          $this->setPosition($index);
          return $collectionToken;
        }
      }

      $this->setValid(false);
      return new Token();
    }


    /**
     * Array may contain Int, String or any StrategyInterface object
     *
     * @param array $conditions
     * @return Collection
     */
    public function sequence(array $conditions) {
      $range = new Collection();
      foreach ($conditions as $value) {
        $range[] = $this->checkFromSequence($value);
      }

      return $range;
    }


    /**
     * @param string|int|StrategyInterface $value
     * @return Token
     */
    private function checkFromSequence($value) {
      if ($value instanceof StrategyInterface) {
        $query = $value;
      } else {
        $query = $this->buildStrategyCondition($value, Strict::create());
      }

      return $this->process($query);
    }


    /**
     * @inheritdoc
     */
    public function process(StrategyInterface $strategy) {

      if ($this->isValid() === false) {
        return new Token();
      }

      $result = $strategy->process($this->collection, $this->getPosition());

      if ($result->isValid() === false) {
        $this->setValid(false);
        return new Token();
      }

      $position = $result->getNexTokenIndex();
      $this->setPosition($position);

      $token = $result->getToken();
      if ($token === null) {
        $token = new Token();
      }

      if ($this->skipWhitespaces and isset($this->collection[$position]) and $this->collection[$position]->getType() === T_WHITESPACE) {
        # skip whitespaces in next check
        $this->setPosition($position + 1);
      }

      return $token;
    }


    /**
     *
     * @param StrategyInterface|string|int $value
     * @param QueryStrategy $defaultStrategy
     * @return QueryStrategy
     */
    private function buildStrategyCondition($value, QueryStrategy $defaultStrategy) {

      if ($value instanceof $defaultStrategy) {
        return $value;
      }

      $query = $defaultStrategy;

      if (is_string($value)) {
        $query->valueIs($value);
        return $query;
      }

      if ($value === null) {
        $query->valueIs([]);
        return $query;
      }

      if (is_int($value)) {
        $query->typeIs($value);
        return $query;
      }


      throw new InvalidArgumentException('Invalid token condition. Expect string or int or StrategyInterface');
    }


    /**
     * @param boolean $valid
     * @return $this
     */
    public function setValid($valid) {
      if (!is_bool($valid)) {
        throw new InvalidArgumentException('Invalid flag. Expect boolean. Given:' . gettype($valid));
      }
      $this->valid = $valid;
      return $this;
    }


    /**
     * @return Token
     */
    public function getToken() {
      $position = $this->getPosition();
      $token = $this->getCollection()->offsetGet($position);

      if ($token !== null) {
        return $token;
      }

      return new Token();
    }


    /**
     * Indicate state of all conditions
     *
     * @return bool
     */
    public function isValid() {
      return ($this->valid === true);
    }


    /**
     * @param boolean $skipWhitespaces
     * @return $this
     */
    public function setSkipWhitespaces($skipWhitespaces) {
      $this->skipWhitespaces = $skipWhitespaces;
      return $this;
    }

  }