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<?php |
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namespace Cerbero\JsonParser\Tokens; |
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use Cerbero\JsonParser\Exceptions\SyntaxException; |
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use Cerbero\JsonParser\Sources\Source; |
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use Cerbero\JsonParser\Tokens\Token; |
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use Cerbero\JsonParser\Tokens\Tokenizer; |
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use Cerbero\JsonParser\Tokens\Tokens; |
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use Cerbero\JsonParser\ValueObjects\Progress; |
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use IteratorAggregate; |
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use Traversable; |
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use function strlen; |
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/** |
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* The JSON lexer. |
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* |
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* @implements IteratorAggregate<int, Token> |
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*/ |
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final class Lexer implements IteratorAggregate |
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{ |
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/** |
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* The parsing progress. |
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* |
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* @var Progress |
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*/ |
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private Progress $progress; |
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/** |
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* The current position. |
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* |
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* @var int |
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*/ |
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private int $position = 1; |
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/** |
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* Instantiate the class. |
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* |
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* @param Source $source |
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*/ |
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public function __construct(private Source $source) |
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{ |
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$this->progress = new Progress(); |
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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 \Generator<int, Token> |
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*/ |
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330 |
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public function getIterator(): Traversable |
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{ |
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$buffer = ''; |
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$inString = $isEscaping = false; |
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foreach ($this->source as $chunk) { |
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for ($i = 0, $size = strlen($chunk); $i < $size; $i++, $this->position++) { |
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$character = $chunk[$i]; |
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$inString = ($character == '"') != $inString || $isEscaping; |
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$isEscaping = $character == '\\' && !$isEscaping; |
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$shouldBuffer = $inString || !isset(Tokens::BOUNDARIES[$character]); |
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if ($shouldBuffer && $buffer == '' && !isset(Tokens::TYPES[$character])) { |
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throw new SyntaxException($character); |
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} |
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if ($shouldBuffer) { |
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$buffer .= $character; |
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continue; |
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} |
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if ($buffer != '') { |
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yield Tokenizer::instance()->toToken($buffer); |
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$buffer = ''; |
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} |
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if (isset(Tokens::DELIMITERS[$character])) { |
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yield Tokenizer::instance()->toToken($character); |
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} |
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} |
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} |
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} |
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/** |
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* Retrieve the current position |
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* |
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* @return int |
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*/ |
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public function position(): int |
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{ |
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return $this->position; |
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} |
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/** |
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* Retrieve the parsing progress |
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* |
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* @return Progress |
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*/ |
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public function progress(): Progress |
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{ |
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return $this->progress->setCurrent($this->position)->setTotal($this->source->size()); |
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} |
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} |
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cerbero90 /
json-parser
