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<?php |
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/** |
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* This file is part of Railt package. |
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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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declare(strict_types=1); |
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namespace Railt\SDL\Frontend; |
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use Laminas\Code\Exception\InvalidArgumentException; |
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use Laminas\Code\Generator\Exception\RuntimeException; |
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use Laminas\Code\Generator\ValueGenerator; |
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use Phplrt\Compiler\Analyzer; |
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use Phplrt\Compiler\Compiler; |
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use Phplrt\Contracts\Grammar\RuleInterface; |
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use Phplrt\Source\Exception\NotFoundException; |
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use Phplrt\Source\Exception\NotReadableException; |
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use Phplrt\Source\File; |
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/** |
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* Class Generator |
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*/ |
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class Generator |
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{ |
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/** |
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* @var string |
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*/ |
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private const GRAMMAR_PATHNAME = __DIR__ . '/../../resources/grammar/grammar.pp2'; |
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/** |
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* @var string |
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*/ |
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private const GRAMMAR_TEMPLATE_PATHNAME = __DIR__ . '/../../resources/templates/grammar.tpl.php'; |
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/** |
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* @var Analyzer |
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*/ |
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private Analyzer $analyzer; |
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/** |
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* Generator constructor. |
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* |
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* @throws NotFoundException |
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* @throws NotReadableException |
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* @throws \Throwable |
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*/ |
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public function __construct() |
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{ |
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$this->analyzer = $this->bootAnalyzer(); |
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} |
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/** |
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* @return Analyzer |
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* @throws NotFoundException |
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* @throws NotReadableException |
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* @throws \Throwable |
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*/ |
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private function bootAnalyzer(): Analyzer |
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{ |
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$compiler = new Compiler(); |
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$compiler->load(File::fromPathname(self::GRAMMAR_PATHNAME)); |
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return $compiler->getAnalyzer(); |
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} |
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/** |
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* @return void |
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* @throws RuntimeException |
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* @throws InvalidArgumentException |
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*/ |
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public function generateAndSave(): void |
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{ |
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\file_put_contents(__DIR__ . '/grammar.php', $this->generate()); |
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} |
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/** |
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* @return string |
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* @throws RuntimeException |
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* @throws InvalidArgumentException |
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*/ |
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public function generate(): string |
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{ |
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return $this->render(self::GRAMMAR_TEMPLATE_PATHNAME, [ |
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'initial' => $this->value($this->analyzer->initial), |
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'lexemes' => $this->value($this->analyzer->tokens[Analyzer::STATE_DEFAULT]), |
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'skips' => $this->value($this->analyzer->skip), |
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'grammar' => $this->getRulesString(), |
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'reducers' => $this->getReducersString(), |
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]); |
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} |
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/** |
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* @param string $pathname |
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* @param array $variables |
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* @return string |
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*/ |
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private function render(string $pathname, array $variables = []): string |
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{ |
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\extract($variables, \EXTR_OVERWRITE); |
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return require $pathname; |
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} |
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/** |
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* @param mixed $value |
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* @param int $depth |
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* @return string |
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* @throws InvalidArgumentException |
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* @throws RuntimeException |
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*/ |
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private function value($value, int $depth = 1): string |
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{ |
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$generator = new ValueGenerator($value); |
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$generator->setArrayDepth($depth); |
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return $generator->generate(); |
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} |
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/** |
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* @return string |
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* @throws RuntimeException |
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*/ |
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private function getRulesString(): string |
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{ |
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$result = []; |
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foreach ($this->analyzer->rules as $index => $rule) { |
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$value = \vsprintf('new \\%s(%s)', [ |
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\get_class($rule), |
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\implode(', ', $this->getRuleArguments($rule)), |
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]); |
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$result[] = $this->value($index) . ' => ' . $value; |
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} |
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return $this->formatArray($result); |
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} |
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/** |
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* @param RuleInterface $rule |
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* @return array |
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* @throws RuntimeException |
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*/ |
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private function getRuleArguments(RuleInterface $rule): array |
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{ |
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$result = []; |
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foreach ($rule->getConstructorArguments() as $arg) { |
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$result[] = $this->value($arg, 2); |
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} |
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return $result; |
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} |
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/** |
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* @param array $result |
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* @return string |
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*/ |
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private function formatArray(array $result): string |
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{ |
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return \vsprintf('[%s%s%s]', [ |
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"\n ", |
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\implode(",\n ", $result), |
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"\n ", |
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]); |
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} |
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/** |
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* @return string |
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* @throws RuntimeException |
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*/ |
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private function getReducersString(): string |
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{ |
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$result = []; |
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foreach ($this->analyzer->reducers as $state => $rule) { |
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$lines = \explode("\n", $rule); |
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foreach ($lines as $index => &$line) { |
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$line = $line ? \str_repeat(' ', $index ? 8 : 12) . $line : ''; |
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} |
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$template = " => static function (\$children) {\n%s\n }"; |
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$result[] = $this->value($state) . \vsprintf($template, [ |
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\implode("\n", $lines), |
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]); |
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} |
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return $this->formatArray($result); |
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} |
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} |
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railt /
sdl
