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<?php |
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declare(strict_types=1); |
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namespace Spiral\Stempler\Lexer; |
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/** |
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* Creates local buffers over byte/token stream. Able to replay some tokens. |
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* |
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* @implements \IteratorAggregate<array-key, Byte|Token|null> |
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*/ |
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final class Buffer implements \IteratorAggregate |
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{ |
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/** @var Byte[]|Token[] */ |
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private array $buffer = []; |
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/** @var Byte[]|Token[] */ |
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private array $replay = []; |
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255 |
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public function __construct( |
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/** @internal */ |
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private readonly \Generator $generator, |
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private int $offset = 0, |
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) { |
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255 |
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} |
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/** |
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* Delegate generation to the nested generator and collect |
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* generated token/char stream. |
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* |
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* @return \Generator<array-key, Byte|Token|null> |
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*/ |
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public function getIterator(): \Traversable |
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{ |
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while ($n = $this->next()) { |
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yield $n; |
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} |
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} |
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public function getOffset(): int |
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{ |
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return $this->offset; |
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} |
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public function next(): Byte|Token|null |
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{ |
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if ($this->replay !== []) { |
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$n = \array_shift($this->replay); |
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} else { |
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$n = $this->generator->current(); |
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if ($n === null) { |
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return null; |
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} |
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$this->generator->next(); |
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$this->buffer[] = $n; |
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} |
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if ($n !== null && $n->offset !== null) { |
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$this->offset = $n->offset; |
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} |
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return $n; |
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} |
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/** |
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* Get all the string content until first token. |
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*/ |
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public function nextBytes(): string |
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{ |
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$result = ''; |
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while ($n = $this->next()) { |
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if ($n instanceof Byte) { |
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$result .= $n->char; |
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} else { |
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break; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Get next generator value without advancing the position. |
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*/ |
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1 |
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public function lookahead(): Byte|Token|null |
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{ |
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if ($this->replay !== []) { |
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return $this->replay[0]; |
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} |
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$n = $this->next(); |
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if ($n !== null) { |
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\array_unshift($this->replay, $n); |
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} |
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return $n; |
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} |
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/** |
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* Get next byte(s) value if any. |
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* |
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* @param int $size Size of lookup string. |
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*/ |
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public function lookaheadByte(int $size = 1): string |
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{ |
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$result = ''; |
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$replay = []; |
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for ($i = 0; $i < $size; $i++) { |
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$n = $this->next(); |
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if ($n !== null) { |
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$replay[] = $n; |
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} |
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if (!$n instanceof Byte) { |
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break; |
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} |
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$result .= $n->char; |
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} |
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foreach (\array_reverse($replay) as $n) { |
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\array_unshift($this->replay, $n); |
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} |
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return $result; |
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} |
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/** |
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* Replay all the byte and token stream after given offset. |
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*/ |
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95 |
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public function replay(int $offset): void |
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{ |
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foreach ($this->buffer as $n) { |
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if ($n->offset > $offset) { |
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$this->replay[] = $n; |
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} |
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} |
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} |
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2 |
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public function cleanReplay(): void |
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{ |
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2 |
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$this->replay = []; |
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} |
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} |
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spiral /
framework
