#include "PolySetCache.h"
#include "PolySetEvaluator.h"
#include "printutils.h"
#include "polyset.h"

/*!
	The task of PolySetEvaluator is to create, keep track of and cache PolySet instances.

	All instances of PolySet which are not strictly temporary should be requested through this
	class.
*/

static bool filter(char c)
{
	return c == ' ' || c == '\n' || c == '\t' || c == '\r';
}

/*!
  Factory method returning a PolySet from the given node. If the
  node is already cached, the cached PolySet will be returned
  otherwise a new PolySet will be created from the node. If cache is
  true, the newly created PolySet will be cached.
 */
shared_ptr<PolySet> PolySetEvaluator::getPolySet(const AbstractNode &node, bool cache)
{
	std::string cacheid = this->tree.getString(node);
	cacheid.erase(std::remove_if(cacheid.begin(), cacheid.end(), filter), cacheid.end());

	if (PolySetCache::instance()->contains(cacheid)) {
// For cache debugging
//		PRINTF("Cache hit: %s", cacheid.substr(0, 40).c_str());
		return PolySetCache::instance()->get(cacheid);
	}

	shared_ptr<PolySet> ps(node.evaluate_polyset(this));
	if (cache) PolySetCache::instance()->insert(cacheid, ps);
	return ps;
}