public function interpretSource(O\Expression $expression)
{
$isQueryScope = false;
$queryableQueryResolver = new O\DynamicExpressionWalker([O\TraversalExpression::getType() => function (O\TraversalExpression $expression, O\ExpressionWalker $self) use(&$isQueryScope) {
$expression = $expression->updateValue($self->walk($expression->getValue()));
if ($isQueryScope) {
return $expression;
} else {
return $self->walk(O\Expression::value($expression->evaluate($this->evaluationContext)));
}
}, O\ValueExpression::getType() => function (O\ValueExpression $expression) use(&$isQueryScope) {
if ($expression->getValue() instanceof IQueryable) {
$isQueryScope = true;
}
return $expression;
}]);
$expression = $queryableQueryResolver->walk($expression);
if ($isQueryScope) {
$this->scopeInterpreter->interpretScope($expression);
$this->interpretation->interpretQueryScope($this->getId('source-scope'), $this->scopeInterpreter->getInterpretation());
} else {
$this->interpretation->interpretArrayOrIterator($this->getId('source-iterator'), $expression->evaluate($this->evaluationContext));
}
}
public function tryComputeResults(O\Expression $queryExpression, &$results)
{
if (isset($this->storage[$queryExpression])) {
$results = $this->storage[$queryExpression];
return true;
}
$foundApplicableResults = false;
//Searches the query expression tree and checks if any parent expressions have saved results
//If so, the expression tree is updated with a Traversable implementation with the saved results
$applicableScopeFinder = function (O\Expression $expression, O\ExpressionWalker $self) use(&$foundApplicableResults) {
if (isset($this->storage[$expression])) {
$foundApplicableResults = true;
return O\Expression::value($this->newTraversable($this->storage[$expression]));
}
if ($expression instanceof O\ValueExpression) {
return $expression;
}
/** @var $expression O\TraversalExpression */
return $expression->updateValue($self->walk($expression->getValue()));
};
$traversalWalker = new O\DynamicExpressionWalker([O\TraversalExpression::getType() => $applicableScopeFinder, O\ValueExpression::getType() => $applicableScopeFinder]);
$remainingQueryExpression = $traversalWalker->walk($queryExpression);
//If found applicable results, execute the updated expression tree against the Traversable
//implementation to compute the result of the query.
$results = $foundApplicableResults ? $remainingQueryExpression->evaluate() : null;
return $foundApplicableResults;
}
protected final function interpretSourceAsScope(O\TraversalExpression $expression)
{
$this->scopeInterpreter->interpretScope($expression->getValue());
}