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<?php declare(strict_types=1); |
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/** |
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* This file is part of the daikon-cqrs/entity project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Daikon\Entity\Path; |
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use Daikon\Interop\Assertion; |
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use JMS\Parser\AbstractParser; |
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use JMS\Parser\SimpleLexer; |
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final class ValuePathParser extends AbstractParser |
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{ |
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private const T_ATTRIBUTE = 1; |
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private const T_POSITION = 2; |
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private const T_COMPONENT_SEP = 3; |
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private const T_PART_SEP = 4; |
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private const TOKEN_REGEX = <<<REGEX |
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/ |
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# type identifier which refers to an attribute |
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([a-zA-Z_]+) |
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# value position |
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|(\d+) |
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# value-path-component separator. the two components of a value-path-part being attribute and position. |
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|(\.) |
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# value-path separator |
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|(\-) |
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/x |
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REGEX; |
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private const TOKEN_MAP = [ |
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0 => 'T_UNKNOWN', |
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1 => 'T_ATTRIBUTE', |
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2 => 'T_POSITION', |
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3 => 'T_PART_SEP' |
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]; |
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public static function create(): ValuePathParser |
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{ |
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$mapToken = function (string $token): array { |
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switch ($token) { |
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case '.': |
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return [ self::T_COMPONENT_SEP, $token ]; |
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case '-': |
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return [ self::T_PART_SEP, $token ]; |
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default: |
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return is_numeric($token) |
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? [ self::T_POSITION, (int)$token ] |
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: [ self::T_ATTRIBUTE, $token ]; |
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} |
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}; |
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$lexer = new SimpleLexer(self::TOKEN_REGEX, self::TOKEN_MAP, $mapToken); |
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return new ValuePathParser($lexer); |
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} |
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/** |
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* @param string $path |
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* @param string $context |
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*/ |
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public function parse($path, $context = null): ValuePath |
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{ |
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return parent::parse($path, $context); |
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} |
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public function parseInternal(): ValuePath |
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{ |
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$valuePathParts = []; |
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while ($valuePathPart = $this->consume()) { |
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$valuePathParts[] = $valuePathPart; |
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} |
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return new ValuePath($valuePathParts); |
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} |
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private function consume(): ?ValuePathPart |
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{ |
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$this->eatSeparator(); |
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$attribute = $this->parseAttribute(); |
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return is_null($attribute) ? null : new ValuePathPart($attribute, $this->parsePosition()); |
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} |
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private function eatSeparator(): void |
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{ |
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if ($this->lexer->isNext(self::T_PART_SEP)) { |
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$this->match(self::T_PART_SEP); |
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} |
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} |
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private function parseAttribute(): ?string |
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{ |
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if (!$this->lexer->isNext(self::T_ATTRIBUTE)) { |
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Assertion::null($this->lexer->next, 'Expecting T_TYPE at the beginning of a new path-part.'); |
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return null; |
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} |
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return $this->match(self::T_ATTRIBUTE); |
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} |
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private function parsePosition(): int |
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{ |
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if ($this->lexer->isNext(self::T_COMPONENT_SEP)) { |
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$this->match(self::T_COMPONENT_SEP); |
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return $this->match(self::T_POSITION); |
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} |
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return -1; |
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} |
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} |
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daikon-cqrs /
entity
