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<?php |
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namespace Cerbero\JsonParser\Tokens; |
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use Cerbero\JsonParser\Decoders\ConfigurableDecoder; |
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use Cerbero\JsonParser\Exceptions\SyntaxException; |
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use Cerbero\JsonParser\Tokens\CompoundBegin; |
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use Cerbero\JsonParser\Tokens\CompoundEnd; |
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use Cerbero\JsonParser\Tokens\Token; |
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use Cerbero\JsonParser\ValueObjects\Config; |
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use Cerbero\JsonParser\ValueObjects\State; |
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use Generator; |
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use IteratorAggregate; |
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use Traversable; |
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/** |
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* The JSON parser. |
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* |
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* @implements IteratorAggregate<string|int, mixed> |
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*/ |
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final class Parser implements IteratorAggregate |
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{ |
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/** |
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* The decoder handling potential errors. |
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* |
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* @var ConfigurableDecoder |
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*/ |
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private ConfigurableDecoder $decoder; |
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/** |
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* Whether the parser is fast-forwarding. |
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* |
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* @var bool |
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*/ |
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private bool $isFastForwarding = false; |
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/** |
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* Instantiate the class. |
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* |
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* @param Generator<int, Token> $tokens |
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* @param Config $config |
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*/ |
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342 |
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public function __construct(private Generator $tokens, private Config $config) |
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{ |
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$this->decoder = new ConfigurableDecoder($config); |
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} |
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/** |
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* Retrieve the JSON fragments |
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* |
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* @return Traversable<string|int, mixed> |
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*/ |
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public function getIterator(): Traversable |
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{ |
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$state = new State($this->config->pointers, fn () => new self($this->lazyLoad(), clone $this->config)); |
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foreach ($this->tokens as $token) { |
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if ($this->isFastForwarding) { |
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continue; |
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} elseif (!$token->matches($state->expectedToken)) { |
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throw new SyntaxException($token); |
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} |
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$state->mutateByToken($token); |
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if (!$token->endsChunk() || $state->tree()->isDeep()) { |
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continue; |
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} |
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if ($state->hasBuffer()) { |
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/** @var string|int $key */ |
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$key = $this->decoder->decode($state->key()); |
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$value = $this->decoder->decode($state->value()); |
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yield $key => $state->callPointer($value, $key); |
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$value instanceof self && $value->fastForward(); |
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} |
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if ($state->canStopParsing()) { |
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break; |
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} |
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} |
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} |
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/** |
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* Retrieve the generator to lazy load the current compound |
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* |
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* @return Generator<int, Token> |
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*/ |
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public function lazyLoad(): Generator |
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{ |
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$depth = 0; |
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do { |
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yield $token = $this->tokens->current(); |
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if ($token instanceof CompoundBegin) { |
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$depth++; |
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} elseif ($token instanceof CompoundEnd) { |
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$depth--; |
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} |
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$depth > 0 && $this->tokens->next(); |
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} while ($depth > 0); |
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} |
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/** |
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* Eager load the current compound into an array |
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* |
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* @return array<string|int, mixed> |
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*/ |
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public function toArray(): array |
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{ |
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$array = []; |
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foreach ($this as $key => $value) { |
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$array[$key] = $value instanceof self ? $value->toArray() : $value; |
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} |
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return $array; |
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} |
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/** |
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* Fast-forward the parser |
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* |
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* @return void |
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*/ |
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public function fastForward(): void |
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{ |
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if (!$this->tokens->valid()) { |
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return; |
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} |
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$this->isFastForwarding = true; |
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foreach ($this as $value) { |
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$value instanceof self && $value->fastForward(); |
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} |
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} |
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} |
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cerbero90 /
json-parser
