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<?php |
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namespace Bdf\Prime\Query\Closure\Parser; |
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use Bdf\Prime\Query\Closure\Filter\AndFilter; |
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use Bdf\Prime\Query\Closure\Filter\AtomicFilter; |
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use Bdf\Prime\Query\Closure\Filter\OrFilter; |
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use Bdf\Prime\Query\Closure\Value\ConstantValue; |
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use Exception; |
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use PhpParser\Node; |
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use RuntimeException; |
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use function count; |
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/** |
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* Parse a boolean expression |
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* |
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* Handle: |
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* - binary operations (e.g. $entity->foo >= 1) |
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* - function call (e.g. in_array($entity->foo, [1, 2, 3])) |
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* - unary boolean expression (e.g. !$entity->foo) |
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* - And expression (e.g. $entity->foo > 5 && $entity->bar < 42) |
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* - Or expression (e.g. $entity->foo || $entity->bar > 42) |
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*/ |
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final class BooleanExpressionParser |
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{ |
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private const OPERATORS_MAPPING = [ |
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'==' => '=', |
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'===' => '=', |
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'!==' => '!=', |
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]; |
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private EntityAccessorParser $entityAccessorParser; |
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private FunctionCallParser $functionCallParser; |
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private ValueParser $valueParser; |
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/** |
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* @param EntityAccessorParser $entityAccessorParser |
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* @param FunctionCallParser $functionCallParser |
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* @param ValueParser $valueParser |
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*/ |
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public function __construct(EntityAccessorParser $entityAccessorParser, FunctionCallParser $functionCallParser, ValueParser $valueParser) |
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{ |
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$this->entityAccessorParser = $entityAccessorParser; |
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$this->functionCallParser = $functionCallParser; |
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$this->valueParser = $valueParser; |
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} |
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/** |
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* @param Node\Expr $expr |
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* @return AndFilter |
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*/ |
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public function parse(Node\Expr $expr): AndFilter |
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{ |
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if ($expr instanceof Node\Expr\BinaryOp\BooleanAnd) { |
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return new AndFilter($this->parse($expr->left), $this->parse($expr->right)); |
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} |
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if ($expr instanceof Node\Expr\BinaryOp\BooleanOr) { |
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return new AndFilter($this->parseOrExpression($expr)); |
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} |
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if ($expr instanceof Node\Expr\BinaryOp) { |
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return new AndFilter($this->parseBinaryOperation($expr)); |
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} |
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if ($expr instanceof Node\Expr\FuncCall) { |
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return new AndFilter($this->functionCallParser->parse($expr)); |
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} |
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try { |
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return new AndFilter($this->parseUnaryBooleanExpression($expr)); |
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} catch (Exception $e) { |
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throw new RuntimeException('Unsupported expression ' . $expr->getType() . ' in filters. Supported expressions are: binary operations, function calls getter for a boolean, and not expression.'); |
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} |
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} |
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private function parseBinaryOperation(Node\Expr\BinaryOp $expr): AtomicFilter |
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{ |
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return new AtomicFilter( |
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$this->entityAccessorParser->parse($expr->left), |
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self::OPERATORS_MAPPING[$expr->getOperatorSigil()] ?? $expr->getOperatorSigil(), |
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$this->valueParser->parse($expr->right), |
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); |
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} |
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private function parseUnaryBooleanExpression(Node\Expr $expr): AtomicFilter |
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{ |
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if ($expr instanceof Node\Expr\BooleanNot) { |
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$expr = $expr->expr; |
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$value = false; |
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} else { |
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$value = true; |
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} |
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// Simple boolean expression |
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return new AtomicFilter( |
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$this->entityAccessorParser->parse($expr), |
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'=', |
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new ConstantValue($value), |
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); |
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} |
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private function parseOrExpression(Node\Expr\BinaryOp\BooleanOr $expr): OrFilter |
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{ |
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$left = $this->parse($expr->left); |
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$right = $this->parse($expr->right); |
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$filters = []; |
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if (count($left) === 1 && $left[0] instanceof OrFilter) { |
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$filters = $left[0]->filters; |
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} else { |
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$filters[] = $left; |
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} |
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if (count($right) === 1 && $right[0] instanceof OrFilter) { |
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$filters = [...$filters, ...$right[0]->filters]; |
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} else { |
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$filters[] = $right; |
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} |
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return new OrFilter($filters); |
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} |
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} |
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b2pweb /
bdf-prime
