public function testOptimizeOptionalEmpty()
{
$optimizer = new slRegularExpressionOptimizer();
$regexp = new slRegularExpressionOptional(new slRegularExpressionEmpty());
$optimizer->optimize($regexp);
$this->assertEquals(new slRegularExpressionEmpty(), $regexp);
}
/**
* Get regular expressions for learned schema
*
* Get an array of type -> regular expression associations for the learned
* schema.
*
* @return array(slSchemaElement)
*/
public function getTypes()
{
if ($this->typesMerged) {
return $this->elements;
}
$this->elements = $this->typeMerger->groupTypes($this->elements);
$optimizer = new slRegularExpressionOptimizer();
// Ensure the regular expressions in all elements are up to date
foreach ($this->elements as $type => $element) {
$regularExpression = $this->convertRegularExpression($element->type->automaton);
$regularExpression = $this->filterStartEndMarkers($regularExpression);
// If the element has been empty at least once, make the whole
// subpattern optional
if ($element->type->empty) {
$regularExpression = new slRegularExpressionOptional($regularExpression);
}
// Second optimizing step
$optimizer->optimize($regularExpression);
// Apply type mapping from type merger recursively to regular
// expression.
$element->type->regularExpression = $regularExpression;
}
$this->typesMerged = true;
return $this->elements;
}
