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<?php |
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namespace Graze\Morphism\Parse; |
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use LogicException; |
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use RuntimeException; |
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/** |
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* Represents the definition of an check, this is currently only parsed but not added back to any schema. Checks are |
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* added automatically by MySQL, excluding them allows morphism to be backwards compatible with MySQL < 8. |
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*/ |
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class CheckDefinition |
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{ |
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/** @var string|null */ |
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public $name = null; |
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/** @var string */ |
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public $expression; |
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/** |
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* Parses an check definition from $stream |
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* |
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* If the optional preceding CONSTRAINT clause was parsed, you should supply its optional $name. |
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* |
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* @param TokenStream $stream |
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* @param string|null $name name supplied in optional CONSTRAINT clause |
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*/ |
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public function parse(TokenStream $stream, $name = null) |
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{ |
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$this->name = $name; |
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$this->expression = $this->parseExpressionBetweenBrackets($stream); |
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$mark = $stream->getMark(); |
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$token = $stream->nextToken(); |
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// Check for [NOT] ENFORCED |
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if ($token->eq(Token::IDENTIFIER, 'NOT')) { |
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$stream->expect(Token::IDENTIFIER, 'ENFORCED'); |
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$this->expression .= ' NOT ENFORCED'; |
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} elseif ($token->eq(Token::IDENTIFIER, 'ENFORCED')) { |
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$this->expression .= ' ENFORCED'; |
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} else { |
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$stream->rewind($mark); |
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} |
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} |
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/** |
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* Parses an expression between brackets, the next token is expected to be a bracket. |
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* |
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* @param TokenStream $stream |
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* @return string |
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*/ |
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private function parseExpressionBetweenBrackets(TokenStream $stream) |
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{ |
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$stream->expectOpenParen(); |
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$expression = '('; |
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$previousToken = null; |
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$token = null; |
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while (true) { |
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$mark = $stream->getMark(); |
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$previousToken = $token; |
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$token = $stream->nextToken(); |
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if ($token->eq(Token::SYMBOL, '(')) { |
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// Nested expression found. |
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$stream->rewind($mark); |
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if ($previousToken && $previousToken->type != Token::SYMBOL) { |
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$expression .= ' '; |
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} |
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$expression .= $this->parseExpressionBetweenBrackets($stream); |
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} elseif ($token->eq(Token::SYMBOL, ')')) { |
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// Ending bracket found, stop parsing. |
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$expression .= ')'; |
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break; |
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} elseif ($token->isEof()) { |
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throw new RuntimeException("Unexpected end-of-file"); |
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} else { |
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if ($previousToken && $previousToken->type != Token::SYMBOL && $token->type != Token::SYMBOL) { |
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$expression .= ' '; |
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} |
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$expression .= $token->text; |
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} |
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} |
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return $expression; |
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} |
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} |
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graze /
morphism
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