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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\UniLex\Example\Brainfuck\Grammar; |
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use Remorhaz\UniLex\Example\Brainfuck\Exception; |
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use Remorhaz\UniLex\Example\Brainfuck\Command\LoopCommand; |
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use Remorhaz\UniLex\Example\Brainfuck\Command\OutputCommand; |
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use Remorhaz\UniLex\Example\Brainfuck\Runtime; |
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use Remorhaz\UniLex\Example\Brainfuck\Command\SetCommandIndexCommand; |
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use Remorhaz\UniLex\Example\Brainfuck\Command\ShiftDataIndexCommand; |
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use Remorhaz\UniLex\Example\Brainfuck\Command\ShiftDataValueCommand; |
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use Remorhaz\UniLex\Grammar\SDD\TranslationSchemeInterface; |
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use Remorhaz\UniLex\Parser\Production; |
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use Remorhaz\UniLex\Parser\Symbol; |
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use Remorhaz\UniLex\Lexer\Token; |
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use Throwable; |
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class TranslationScheme implements TranslationSchemeInterface |
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{ |
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private $runtime; |
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public function __construct(Runtime $runtime) |
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{ |
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$this->runtime = $runtime; |
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} |
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/** |
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* @param Production $production |
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* @throws Exception |
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*/ |
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public function applyProductionActions(Production $production): void |
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{ |
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$hash = "{$production->getHeader()->getSymbolId()}.{$production->getIndex()}"; |
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switch ($hash) { |
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case SymbolType::NT_LOOP . ".0": |
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try { |
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$loopCommand = $production |
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->getSymbol(0) |
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->getAttribute('loop_command'); |
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} catch (Throwable $e) { |
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throw new Exception("Loop start command not found", 0, $e); |
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} |
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if (!$loopCommand instanceof LoopCommand) { |
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throw new Exception("Invalid loop start command"); |
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} |
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$command = new SetCommandIndexCommand($this->runtime, $loopCommand->getIndex()); |
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$this->runtime->addCommand($command); |
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$loopCommand->setEndLoopIndex($command->getIndex()); |
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break; |
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} |
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} |
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public function applySymbolActions(Production $production, int $symbolIndex): void |
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{ |
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} |
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/** |
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* @param Symbol $symbol |
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* @param Token $token |
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* @throws Exception |
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*/ |
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public function applyTokenActions(Symbol $symbol, Token $token): void |
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{ |
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switch ($token->getType()) { |
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case TokenType::NEXT: |
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$command = new ShiftDataIndexCommand($this->runtime, 1); |
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$this->runtime->addCommand($command); |
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break; |
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case TokenType::PREV: |
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$command = new ShiftDataIndexCommand($this->runtime, -1); |
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$this->runtime->addCommand($command); |
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break; |
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case TokenType::INC: |
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$command = new ShiftDataValueCommand($this->runtime, 1); |
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$this->runtime->addCommand($command); |
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break; |
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case TokenType::DEC: |
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$command = new ShiftDataValueCommand($this->runtime, -1); |
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$this->runtime->addCommand($command); |
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break; |
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case TokenType::OUTPUT: |
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$command = new OutputCommand($this->runtime); |
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$this->runtime->addCommand($command); |
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break; |
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case TokenType::LOOP: |
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$command = new LoopCommand($this->runtime); |
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$this->runtime->addCommand($command); |
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try { |
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$symbol->setAttribute('loop_command', $command); |
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} catch (Throwable $e) { |
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throw new Exception("Failed to setup loop calculation"); |
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} |
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break; |
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} |
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} |
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} |
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remorhaz /
php-unilex
