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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\UniLex\RegExp\Grammar; |
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use Remorhaz\UniLex\Exception; |
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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 TokenTranslationScheme |
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{ |
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private $symbol; |
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private $token; |
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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 applyActions(Symbol $symbol, Token $token): void |
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{ |
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$this->setContext($symbol, $token); |
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switch ($symbol->getSymbolId()) { |
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case SymbolType::T_DIGIT_ZERO: |
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case SymbolType::T_DIGIT_OCT: |
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$this |
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->copyTokenAttribute('s.code', TokenAttribute::CODE) |
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->copyTokenAttribute('s.oct_digit', TokenAttribute::DIGIT) |
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->copyTokenAttribute('s.dec_digit', TokenAttribute::DIGIT) |
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->copyTokenAttribute('s.hex_digit', TokenAttribute::DIGIT); |
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break; |
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case SymbolType::T_DIGIT_DEC: |
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$this |
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->copyTokenAttribute('s.code', TokenAttribute::CODE) |
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->copyTokenAttribute('s.dec_digit', TokenAttribute::DIGIT) |
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->copyTokenAttribute('s.hex_digit', TokenAttribute::DIGIT); |
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break; |
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case SymbolType::T_SMALL_C: |
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case SymbolType::T_OTHER_HEX_LETTER: |
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$this |
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->copyTokenAttribute('s.code', TokenAttribute::CODE) |
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->copyTokenAttribute('s.hex_digit', TokenAttribute::DIGIT); |
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break; |
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case SymbolType::T_COMMA: |
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case SymbolType::T_HYPHEN: |
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case SymbolType::T_CAPITAL_P: |
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case SymbolType::T_RIGHT_SQUARE_BRACKET: |
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case SymbolType::T_SMALL_O: |
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case SymbolType::T_SMALL_P: |
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case SymbolType::T_SMALL_U: |
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case SymbolType::T_SMALL_X: |
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case SymbolType::T_RIGHT_CURLY_BRACKET: |
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case SymbolType::T_CTL_ASCII: |
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case SymbolType::T_PRINTABLE_ASCII_OTHER: |
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case SymbolType::T_NOT_ASCII: |
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case SymbolType::T_DOLLAR: |
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case SymbolType::T_LEFT_BRACKET: |
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case SymbolType::T_RIGHT_BRACKET: |
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case SymbolType::T_STAR: |
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case SymbolType::T_PLUS: |
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case SymbolType::T_QUESTION: |
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case SymbolType::T_LEFT_SQUARE_BRACKET: |
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case SymbolType::T_BACKSLASH: |
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case SymbolType::T_CIRCUMFLEX: |
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case SymbolType::T_LEFT_CURLY_BRACKET: |
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case SymbolType::T_VERTICAL_LINE: |
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case SymbolType::T_DOT: |
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case SymbolType::T_OTHER_ASCII_LETTER: |
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$this |
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->copyTokenAttribute('s.code', TokenAttribute::CODE); |
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break; |
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} |
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} |
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/** |
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* @param string $symbolAttr |
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* @param string $tokenAttr |
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* @return $this |
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* @throws Exception |
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*/ |
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private function copyTokenAttribute(string $symbolAttr, string $tokenAttr) |
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{ |
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try { |
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$value = $this |
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->getToken() |
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->getAttribute($tokenAttr); |
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$this |
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->getSymbol() |
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->setAttribute($symbolAttr, $value); |
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} catch (Throwable $e) { |
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$symbolText = "{$this->getSymbol()->getSymbolId()}.{$symbolAttr}"; |
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$tokenText = "{$this->getToken()->getType()}.{$tokenAttr}"; |
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throw new Exception("Failed to synthesize attribute {$symbolText} from token {$tokenText}", 0, $e); |
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} |
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return $this; |
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} |
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private function setContext(Symbol $symbol, Token $token): void |
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{ |
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$this->symbol = $symbol; |
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$this->token = $token; |
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} |
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/** |
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* @return Symbol |
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* @throws Exception |
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*/ |
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private function getSymbol(): Symbol |
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{ |
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if (!isset($this->symbol)) { |
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throw new Exception("No symbol defined in token translation scheme"); |
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} |
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return $this->symbol; |
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} |
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/** |
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* @return Token |
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* @throws Exception |
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*/ |
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private function getToken(): Token |
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{ |
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if (!isset($this->token)) { |
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throw new Exception("No token defined in token translation scheme"); |
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} |
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return $this->token; |
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} |
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} |
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remorhaz /
php-unilex
