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<?php |
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namespace Ahc\Json; |
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/** |
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* JSON comment stripper. |
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* |
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* @author Jitendra Adhikari <[email protected]> |
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*/ |
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class Comment |
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{ |
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/** @var int The current index being scanned */ |
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protected $index = -1; |
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/** @var bool If current char is within a string */ |
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protected $inStr = false; |
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/** @var int Lines of comments 0 = no comment, 1 = single line, 2 = multi lines */ |
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protected $comment = 0; |
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/** |
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* Strip comments from JSON string. |
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* |
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* @param string $json |
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* |
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* @return string The comment stripped JSON. |
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*/ |
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public function strip($json) |
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{ |
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if (!\preg_match('%\/(\/|\*)%', $json)) { |
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return $json; |
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} |
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$this->reset(); |
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return $this->doStrip($json); |
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} |
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protected function reset() |
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{ |
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$this->index = -1; |
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$this->inStr = false; |
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$this->comment = 0; |
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} |
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protected function doStrip($json) |
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{ |
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$return = ''; |
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while (isset($json[++$this->index])) { |
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list($prev, $char, $next) = $this->getSegments($json); |
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if ($this->inStringOrCommentEnd($prev, $char, $char . $next)) { |
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$return .= $char; |
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continue; |
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} |
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$wasSingle = 1 === $this->comment; |
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if ($this->hasCommentEnded($char, $char . $next) && $wasSingle) { |
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$return = \rtrim($return) . $char; |
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} |
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$this->index += $char . $next === '*/' ? 1 : 0; |
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} |
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return $return; |
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} |
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protected function getSegments($json) |
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{ |
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return [ |
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isset($json[$this->index - 1]) ? $json[$this->index - 1] : '', |
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$json[$this->index], |
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isset($json[$this->index + 1]) ? $json[$this->index + 1] : '', |
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]; |
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} |
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protected function inStringOrCommentEnd($prev, $char, $charnext) |
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{ |
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return $this->inString($char, $prev) || $this->inCommentEnd($charnext); |
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} |
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protected function inString($char, $prev) |
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{ |
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if (0 === $this->comment && $char === '"' && $prev !== '\\') { |
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$this->inStr = !$this->inStr; |
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} |
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return $this->inStr; |
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} |
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protected function inCommentEnd($charnext) |
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{ |
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if (!$this->inStr && 0 === $this->comment) { |
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$this->comment = $charnext === '//' ? 1 : ($charnext === '/*' ? 2 : 0); |
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} |
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return 0 === $this->comment; |
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} |
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protected function hasCommentEnded($char, $charnext) |
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{ |
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$singleEnded = $this->comment === 1 && $char == "\n"; |
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$multiEnded = $this->comment === 2 && $charnext == '*/'; |
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if ($singleEnded || $multiEnded) { |
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$this->comment = 0; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Strip comments and decode JSON string. |
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* |
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* @param string $json |
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* @param bool|bool $assoc |
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* @param int|int $depth |
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* @param int|int $options |
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* |
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* @see http://php.net/json_decode [JSON decode native function] |
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* |
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* @throws \RuntimeException When decode fails. |
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* |
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* @return mixed |
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*/ |
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public function decode($json, $assoc = false, $depth = 512, $options = 0) |
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{ |
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$decoded = \json_decode($this->strip($json), $assoc, $depth, $options); |
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if (\JSON_ERROR_NONE !== $err = \json_last_error()) { |
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$msg = 'JSON decode failed'; |
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if (\function_exists('json_last_error_msg')) { |
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$msg .= ': ' . \json_last_error_msg(); |
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} |
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throw new \RuntimeException($msg, $err); |
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} |
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return $decoded; |
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} |
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/** |
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* Static alias of decode(). |
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*/ |
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public static function parse($json, $assoc = false, $depth = 512, $options = 0) |
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{ |
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static $parser; |
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if (!$parser) { |
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$parser = new static; |
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} |
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return $parser->decode($json, $assoc, $depth, $options); |
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} |
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} |
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adhocore /
php-json-comment
