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<?php |
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namespace Netdudes\DataSourceryBundle\UQL; |
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use Netdudes\DataSourceryBundle\DataSource\Configuration\Field; |
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use Netdudes\DataSourceryBundle\DataSource\Configuration\FieldInterface; |
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use Netdudes\DataSourceryBundle\DataSource\DataSourceInterface; |
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use Netdudes\DataSourceryBundle\Extension\UqlExtensionContainer; |
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use Netdudes\DataSourceryBundle\Query\Filter; |
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use Netdudes\DataSourceryBundle\Query\FilterCondition; |
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use Netdudes\DataSourceryBundle\Query\FilterConditionFactory; |
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use Netdudes\DataSourceryBundle\UQL\AST\ASTArray; |
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use Netdudes\DataSourceryBundle\UQL\AST\ASTAssertion; |
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use Netdudes\DataSourceryBundle\UQL\AST\ASTFunctionCall; |
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use Netdudes\DataSourceryBundle\UQL\AST\ASTGroup; |
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use Netdudes\DataSourceryBundle\UQL\Exception\UQLInterpreterException; |
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/** |
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* Class Interpreter |
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* |
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* The Interpreter transforms the generic Abstract Syntax Tree into Filters |
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*/ |
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class Interpreter |
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{ |
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/** |
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* @var UqlExtensionContainer |
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*/ |
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private $extensionContainer; |
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/** |
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* @var DataSourceInterface |
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*/ |
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private $dataSource; |
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/** |
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* @var array |
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*/ |
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private $dataSourceElements; |
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/** |
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* @var bool |
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*/ |
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private $caseSensitive; |
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/** |
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* @var FilterConditionFactory |
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*/ |
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private $filterConditionFactory; |
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/** |
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* Constructor needs the columns descriptor to figure out appropriate filtering methods |
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* and translate identifiers. |
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* |
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* @param UqlExtensionContainer $extensionContainer |
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* @param DataSourceInterface $dataSource |
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* @param FilterConditionFactory $filterConditionFactory |
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* @param bool $caseSensitive |
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*/ |
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public function __construct( |
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UqlExtensionContainer $extensionContainer, |
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DataSourceInterface $dataSource, |
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FilterConditionFactory $filterConditionFactory, |
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$caseSensitive = true |
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) { |
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$this->extensionContainer = $extensionContainer; |
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$this->dataSource = $dataSource; |
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$this->filterConditionFactory = $filterConditionFactory; |
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$this->caseSensitive = $caseSensitive; |
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// Cache an array of data sources (name => object pairs) for reference during the interpretation |
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$this->dataSourceElements = array_combine( |
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array_map( |
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function (FieldInterface $element) use ($caseSensitive) { |
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return $caseSensitive ? $element->getUniqueName() : strtolower($element->getUniqueName()); |
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}, |
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$this->dataSource->getFields() |
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), |
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$this->dataSource->getFields() |
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); |
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} |
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/** |
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* Helper method: matches filtering operators to valid UQL operators |
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* in order to do Filter to UQL transformations |
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* |
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* @param $method |
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* |
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* @throws Exception\UQLInterpreterException |
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* @return |
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*/ |
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public static function methodToUQLOperator($method) |
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{ |
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$translationMap = [ |
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FilterCondition::METHOD_STRING_EQ => "=", |
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FilterCondition::METHOD_STRING_LIKE => "~", |
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FilterCondition::METHOD_STRING_NEQ => "!=", |
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FilterCondition::METHOD_NUMERIC_GT => ">", |
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FilterCondition::METHOD_NUMERIC_GTE => ">=", |
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FilterCondition::METHOD_NUMERIC_EQ => "=", |
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FilterCondition::METHOD_NUMERIC_LTE => "<=", |
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FilterCondition::METHOD_NUMERIC_LT => "<", |
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FilterCondition::METHOD_NUMERIC_NEQ => "!=", |
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FilterCondition::METHOD_IN => "IN", |
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FilterCondition::METHOD_BOOLEAN => "is", |
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FilterCondition::METHOD_IS_NULL => "is null", |
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FilterCondition::METHOD_DATETIME_GT => "after", |
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FilterCondition::METHOD_DATETIME_GTE => "after or at", |
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FilterCondition::METHOD_DATETIME_EQ => "at", |
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FilterCondition::METHOD_DATETIME_LTE => "before or at", |
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FilterCondition::METHOD_DATETIME_LT => "before", |
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FilterCondition::METHOD_DATETIME_NEQ => "not at", |
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]; |
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if (isset($translationMap[$method])) { |
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return $translationMap[$method]; |
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} |
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throw new UQLInterpreterException("Can't translate filtering method '$method'' into a valid UQL operator"); |
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} |
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/** |
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* Generate the filter objects corresponding to a UQL string. |
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* |
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* @param string $uql |
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* |
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* @return Filter |
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*/ |
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public function interpret($uql) |
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{ |
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if (empty(trim($uql))) { |
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return new Filter(); |
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} |
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$parser = new Parser(); |
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$AST = $parser->parse($uql); |
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return $this->buildFilter($AST); |
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} |
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/** |
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* Transforms a subtree of the AST into a concrete filter definition. |
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* This function recursively builds all sub-trees. |
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* |
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* @param ASTGroup|ASTAssertion|mixed $astSubtree |
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* |
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* TODO: make private |
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* |
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* @return Filter|FilterCondition |
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* @throws \Exception |
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*/ |
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public function buildFilter($astSubtree) |
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{ |
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if ($astSubtree instanceof ASTGroup) { |
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return $this->buildFilterFromASTGroup($astSubtree); |
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} |
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if ($astSubtree instanceof ASTAssertion) { |
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$filterCondition = $this->buildFilterConditionFromASTAssertion($astSubtree); |
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// Single filter. Wrap into dummy filter collection for consistency. |
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$filter = new Filter(); |
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$filter[] = $filterCondition; |
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return $filter; |
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} |
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throw new UQLInterpreterException('Unexpected Abstract Syntax Tree element'); |
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} |
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/** |
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* Translate <operator> tokens into Filter Methods. |
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* |
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* @param string $token |
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* @param FieldInterface $dataSourceElement |
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* |
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* @throws Exception\UQLInterpreterException |
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* @return mixed |
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*/ |
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public function translateOperator($token, FieldInterface $dataSourceElement) |
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{ |
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$translationTable = [ |
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"T_OP_LT" => [ |
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FilterCondition::METHOD_NUMERIC_LT, |
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FilterCondition::METHOD_DATETIME_LT, |
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], |
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"T_OP_LTE" => [ |
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FilterCondition::METHOD_NUMERIC_LTE, |
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FilterCondition::METHOD_DATETIME_LTE, |
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], |
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"T_OP_EQ" => [ |
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FilterCondition::METHOD_NUMERIC_EQ, |
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FilterCondition::METHOD_STRING_EQ, |
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FilterCondition::METHOD_DATETIME_EQ, |
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FilterCondition::METHOD_BOOLEAN, |
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], |
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"T_OP_GTE" => [ |
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FilterCondition::METHOD_NUMERIC_GTE, |
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FilterCondition::METHOD_DATETIME_GTE, |
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], |
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"T_OP_GT" => [ |
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FilterCondition::METHOD_NUMERIC_GT, |
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FilterCondition::METHOD_DATETIME_GT, |
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], |
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"T_OP_NEQ" => [ |
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FilterCondition::METHOD_NUMERIC_NEQ, |
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FilterCondition::METHOD_STRING_NEQ, |
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], |
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"T_OP_LIKE" => [ |
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FilterCondition::METHOD_STRING_LIKE, |
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], |
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"T_OP_IN" => [ |
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FilterCondition::METHOD_IN, |
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], |
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]; |
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if (!isset($translationTable[$token])) { |
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throw new UQLInterpreterException('Unable to translate token ' . $token . ' to a valid filtering method. Unknown token.'); |
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} |
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$possibleMethods = $translationTable[$token]; |
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// See if any of the methods is the default of the data type |
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$dataType = $dataSourceElement->getDataType(); |
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foreach ($possibleMethods as $possibleMethod) { |
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if ($possibleMethod === $dataType->getDefaultFilterMethod()) { |
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return $possibleMethod; |
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} |
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} |
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// Else, just accept the first one in the available methods |
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foreach ($possibleMethods as $possibleMethod) { |
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if (in_array($possibleMethod, $dataType->getAvailableFilterMethods())) { |
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return $possibleMethod; |
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} |
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} |
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throw new UQLInterpreterException('Unable to translate token ' . $token . ' to a valid filtering method. No methods are valid for the data type "' . $dataType->getName() . '" for data element "' . $dataSourceElement->getUniqueName() . '"'); |
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} |
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/** |
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* Translate Lexer <logic> tokens into Filter Condition Types. |
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* |
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* @param $token |
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* |
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* @return string |
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* @throws \Exception |
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*/ |
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private function translateLogic($token) |
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{ |
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$translationTable = [ |
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"T_LOGIC_AND" => Filter::CONDITION_TYPE_AND, |
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"T_LOGIC_OR" => Filter::CONDITION_TYPE_OR, |
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"T_LOGIC_XOR" => Filter::CONDITION_TYPE_XOR, |
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]; |
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if (isset($translationTable[$token])) { |
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return $translationTable[$token]; |
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} |
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throw new \Exception('Unable to translate token ' . $token . ' to a valid filter condition type.'); |
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} |
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/** |
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* Trim and clean up the value to be set in the filter. |
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* |
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* @param $value |
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* |
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* @return mixed |
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*/ |
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private function parseValue($value) |
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{ |
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if (is_bool($value)) { |
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return $value ? "1" : "0"; |
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} |
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return trim($value, "\"'"); |
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} |
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/** |
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* @param ASTFunctionCall $functionCall |
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* |
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* @return mixed |
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* @throws Exception\UQLInterpreterException |
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*/ |
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private function callFunction(ASTFunctionCall $functionCall) |
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{ |
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try { |
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return $this->extensionContainer->callFunction($functionCall->getFunctionName(), $functionCall->getArguments()); |
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} catch (\Exception $e) { |
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throw new UQLInterpreterException("The execution of function '" . $functionCall->getFunctionName() . "' failed. Please check the arguments are valid. (" . $e->getMessage() . ")"); |
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} |
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} |
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/** |
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* @param array $elements |
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* |
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* @return array |
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*/ |
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private function parseArray($elements) |
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{ |
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$array = []; |
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foreach ($elements as $element) { |
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$array[] = $this->parseValue($element); |
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} |
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return $array; |
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} |
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/** |
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* @param string $identifier |
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* |
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* @return Field |
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* @throws UQLInterpreterException |
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*/ |
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private function matchDataSourceElement($identifier) |
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{ |
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if (!$this->caseSensitive) { |
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$identifier = strtolower($identifier); |
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} |
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if (!isset($this->dataSourceElements[$identifier])) { |
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throw new UQLInterpreterException('Unknown filtering element "' . $identifier . '"'); |
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} |
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return $this->dataSourceElements[$identifier]; |
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} |
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/** |
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* @param ASTAssertion $astSubtree |
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* |
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* @throws UQLInterpreterException |
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* |
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* @return array|mixed |
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*/ |
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private function getValue(ASTAssertion $astSubtree) |
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{ |
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if ($astSubtree->getValue() instanceof ASTFunctionCall) { |
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return $this->callFunction($astSubtree->getValue()); |
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} |
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if ($astSubtree->getOperator() == 'T_OP_IN') { |
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if (!($astSubtree->getValue() instanceof ASTArray)) { |
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throw new UQLInterpreterException('Only arrays are valid arguments for IN statements'); |
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} |
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return $this->parseArray($astSubtree->getValue()->getElements()); |
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} |
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return $this->parseValue($astSubtree->getValue()); |
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} |
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348
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/** |
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* @param ASTAssertion $astSubtree |
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* |
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* @throws UQLInterpreterException |
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* |
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* @return FilterCondition |
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*/ |
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private function buildFilterConditionFromASTAssertion(ASTAssertion $astSubtree) |
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{ |
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$field = $this->matchDataSourceElement($astSubtree->getIdentifier()); |
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$method = $this->translateOperator($astSubtree->getOperator(), $field); |
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$value = $this->getValue($astSubtree); |
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return $this->filterConditionFactory->create($field, $method, $value); |
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} |
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364
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/** |
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* @param ASTGroup $astSubtree |
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* |
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* @throws UQLInterpreterException |
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* @throws \Exception |
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* |
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* @return Filter |
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*/ |
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private function buildFilterFromASTGroup(ASTGroup $astSubtree) |
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{ |
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$filter = new Filter(); |
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$condition = $this->translateLogic($astSubtree->getLogic()); |
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$filter->setConditionType($condition); |
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|
|
foreach ($astSubtree->getElements() as $element) { |
378
|
|
|
if ($element instanceof ASTGroup) { |
379
|
|
|
$filter[] = $this->buildFilterFromASTGroup($element); |
380
|
|
|
} |
381
|
|
|
if ($element instanceof ASTAssertion) { |
382
|
|
|
$filter[] = $this->buildFilterConditionFromASTAssertion($element); |
383
|
|
|
} |
384
|
|
|
} |
385
|
|
|
|
386
|
|
|
return $filter; |
387
|
|
|
} |
388
|
|
|
} |
389
|
|
|
|