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<?php declare(strict_types=1); |
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/** |
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* @license http://opensource.org/licenses/mit-license.php MIT |
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* @link https://github.com/nicoSWD |
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* @author Nicolas Oelgart <[email protected]> |
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*/ |
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namespace nicoSWD\Rule\Compiler; |
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use nicoSWD\Rule\Compiler\Exception\MissingOperatorException; |
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use nicoSWD\Rule\Parser\Exception\ParserException; |
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use nicoSWD\Rule\TokenStream\Token\BaseToken; |
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use nicoSWD\Rule\TokenStream\Token\TokenAnd; |
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use nicoSWD\Rule\TokenStream\Token\TokenOpeningParenthesis; |
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class StandardCompiler implements CompilerInterface |
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{ |
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const BOOL_TRUE = '1'; |
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const BOOL_FALSE = '0'; |
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const LOGICAL_AND = '&'; |
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const LOGICAL_OR = '|'; |
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const OPENING_PARENTHESIS = '('; |
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const CLOSING_PARENTHESIS = ')'; |
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/** @var string */ |
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private $output = ''; |
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/** @var int */ |
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private $openParenthesis = 0; |
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/** @var int */ |
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private $closedParenthesis = 0; |
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public function getCompiledRule(): string |
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{ |
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if ($this->isIncompleteCondition()) { |
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throw new ParserException('Incomplete condition'); |
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} elseif (!$this->numParenthesesMatch()) { |
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throw new ParserException('Missing closing parenthesis'); |
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} |
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return $this->output; |
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} |
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private function openParenthesis(): void |
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{ |
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$this->openParenthesis++; |
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$this->output .= self::OPENING_PARENTHESIS; |
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} |
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private function closeParenthesis(): void |
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{ |
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if ($this->openParenthesis < 1) { |
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throw new ParserException('Missing opening parenthesis'); |
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} |
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$this->closedParenthesis++; |
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$this->output .= self::CLOSING_PARENTHESIS; |
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} |
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public function addParentheses(BaseToken $token): void |
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{ |
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if ($token instanceof TokenOpeningParenthesis) { |
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if (!$this->expectOpeningParenthesis()) { |
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throw ParserException::unexpectedToken($token); |
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} |
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$this->openParenthesis(); |
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} else { |
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$this->closeParenthesis(); |
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} |
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} |
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public function addLogical(BaseToken $token): void |
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{ |
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$lastChar = $this->getLastChar(); |
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if ($lastChar === self::LOGICAL_AND || $lastChar === self::LOGICAL_OR) { |
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throw ParserException::unexpectedToken($token); |
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} |
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if ($token instanceof TokenAnd) { |
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$this->output .= self::LOGICAL_AND; |
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} else { |
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$this->output .= self::LOGICAL_OR; |
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} |
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} |
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public function addBoolean(bool $bool): void |
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{ |
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$lastChar = $this->getLastChar(); |
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if ($lastChar === self::BOOL_TRUE || $lastChar === self::BOOL_FALSE) { |
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throw new MissingOperatorException(); |
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} |
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$this->output .= $bool ? self::BOOL_TRUE : self::BOOL_FALSE; |
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} |
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private function numParenthesesMatch(): bool |
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{ |
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return $this->openParenthesis === $this->closedParenthesis; |
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} |
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private function isIncompleteCondition(): bool |
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{ |
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$lastChar = $this->getLastChar(); |
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return ( |
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$lastChar === self::LOGICAL_AND || |
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$lastChar === self::LOGICAL_OR |
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); |
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} |
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private function expectOpeningParenthesis(): bool |
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{ |
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$lastChar = $this->getLastChar(); |
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return ( |
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$lastChar === '' || |
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$lastChar === self::LOGICAL_AND || |
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$lastChar === self::LOGICAL_OR || |
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$lastChar === self::OPENING_PARENTHESIS |
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); |
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} |
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private function getLastChar(): string |
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{ |
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return substr($this->output, -1); |
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} |
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} |
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nicoSWD /
php-rule-parser
