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<?php |
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/** |
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* parser for PHP serialized float number |
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*/ |
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namespace xKerman\Restricted; |
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/** |
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* Parser for PHP serialized float number |
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* |
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* format: http://php.net/manual/en/language.types.float.php |
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*/ |
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class FloatParser implements ParserInterface |
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{ |
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/** |
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* parse given `$source` as PHP serialized float number |
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* |
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* @param Source $source parser input |
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* @return array |
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* @throws UnserializeFailedException |
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*/ |
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public function parse(Source $source) |
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{ |
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$source->consume('d'); |
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$source->consume(':'); |
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$result = ''; |
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if ($source->peek() === 'N') { |
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return $this->parseNan($source); |
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} |
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if ($this->isSign($source->peek())) { |
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$result .= $source->peek(); |
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$source->next(); |
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} |
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if ($source->peek() === 'I') { |
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if ($result === '+') { |
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return $source->triggerError(); |
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} |
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return $this->parseInf($source, ($result === '-')); |
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} |
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list($dnum, $source) = $this->parseDnum($source); |
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$result .= $dnum; |
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list($exponential, $source) = $this->parseExponentialPart($source); |
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$result .= $exponential; |
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$source->consume(';'); |
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return [floatval($result), $source]; |
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} |
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/** |
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* judge if given `$char` is minus|plus sign |
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* |
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* @param string $char target character |
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* @return boolean |
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*/ |
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private function isSign($char) |
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{ |
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return $char === '+' || $char === '-'; |
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} |
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/** |
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* parse given `$source` as NAN |
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* |
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* @param Source $source input |
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* @return array |
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* @throws UnserializeFailedException |
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*/ |
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1 |
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private function parseNan($source) |
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{ |
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$source->consume('N'); |
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1 |
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$source->consume('A'); |
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$source->consume('N'); |
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$source->consume(';'); |
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return [NAN, $source]; |
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} |
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/** |
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* parse given `$source` as INF / -INF |
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* |
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* @param Source $source input |
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* @param boolean $minus target is negative or not |
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* @return array |
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* @throws UnserializeFailedException |
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*/ |
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private function parseInf($source, $minus) |
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{ |
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$source->consume('I'); |
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$source->consume('N'); |
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$source->consume('F'); |
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$source->consume(';'); |
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if ($minus) { |
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return [-INF, $source]; |
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} |
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return [INF, $source]; |
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} |
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/** |
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* parse given `$source` as sequence of DIGIT |
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* |
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* @param Source $source input |
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* @return array |
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* @throws UnserializeFailedException |
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*/ |
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private function parseDigits($source) |
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{ |
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$result = ''; |
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while (ctype_digit($source->peek())) { |
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$result .= $source->peek(); |
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$source->next(); |
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} |
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return [$result, $source]; |
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} |
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/** |
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* parse integer part and fraction part |
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* |
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* @param Source $source input |
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* @return array |
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* @throws UnserializeFailedException |
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*/ |
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private function parseDnum($source) |
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{ |
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list($digits, $source) = $this->parseDigits($source); |
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$result = $digits; |
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$hasIntegerPart = ($digits !== ''); |
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$hasFractionPart = false; |
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if ($source->peek() === '.') { |
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$result .= $source->peek(); |
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$source->next(); |
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list($digits, $source) = $this->parseDigits($source); |
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$result .= $digits; |
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$hasFractionPart = ($digits !== ''); |
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} |
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if (!$hasIntegerPart && !$hasFractionPart) { |
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return $source->triggerError(); |
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} |
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return [$result, $source]; |
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} |
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/** |
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* parse given `$source` as exponentail part |
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* |
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* @param Source $source input |
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* @return array |
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* @throws UnserializeFailedException |
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*/ |
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14 |
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private function parseExponentialPart($source) |
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{ |
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if (strtolower($source->peek()) !== 'e') { |
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8 |
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return ['', $source]; |
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} |
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6 |
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$result = $source->peek(); |
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6 |
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$source->next(); |
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6 |
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$parser = new NumberStringParser(); |
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6 |
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list($exp, $source) = $parser->parse($source); |
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$result .= $exp; |
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return [$result, $source]; |
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} |
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167
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} |
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xKerman /
restricted-unserialize
