$tokens */ public function __construct(array $tokens, int $index = 0) { if ($tokens === []) { $index = 0; } parent::__construct($tokens, $index); } /** * @param int[] $types */ public function isNextTokenTypes(array $types) : bool { foreach ($types as $type) { if ($this->isNextTokenType($type)) { return \true; } } return \false; } public function isTokenTypeOnPosition(int $tokenType, int $position) : bool { $tokens = $this->getTokens(); $token = $tokens[$position] ?? null; if ($token === null) { return \false; } return $token[1] === $tokenType; } public function isNextTokenType(int $tokenType) : bool { if ($this->nextTokenType() === null) { return \false; } return $this->nextTokenType() === $tokenType; } public function printFromTo(int $from, int $to) : string { if ($to < $from) { throw new ShouldNotHappenException('Arguments are flipped'); } $tokens = $this->getTokens(); $content = ''; foreach ($tokens as $key => $token) { if ($key < $from) { continue; } if ($key >= $to) { continue; } $content .= $token[0]; } return $content; } public function currentPosition() : int { return $this->currentTokenIndex(); } public function count() : int { return \count($this->getTokens()); } /** * @return array */ public function partialTokens(int $start, int $end) : array { return \array_slice($this->getTokens(), $start, $end); } public function containsTokenType(int $type) : bool { foreach ($this->getTokens() as $token) { if ($token[1] === $type) { return \true; } } return \false; } private function nextTokenType() : ?int { $tokens = $this->getTokens(); // does next token exist? $nextIndex = $this->currentPosition() + 1; if (!isset($tokens[$nextIndex])) { return null; } $this->pushSavePoint(); $this->next(); $nextTokenType = $this->currentTokenType(); $this->rollback(); return $nextTokenType; } }