Groundwork for world content service and content filtering

common/repositories/criteria/content_filter_criteria.h

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+/**
+ * EQEmulator: Everquest Server Emulator
+ * Copyright (C) 2001-2020 EQEmulator Development Team (https://github.com/EQEmu/Server)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY except by those people which sell it, which
+ * are required to give you total support for your newly bought product;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef EQEMU_CONTENT_FILTER_CRITERIA_H
+#define EQEMU_CONTENT_FILTER_CRITERIA_H
+
+#include <string>
+#include "../../content/world_content_service.h"
+#include "../../string_util.h"
+
+namespace ContentFilterCriteria {
+	static std::string apply()
+	{
+		std::string criteria;
+
+		criteria += fmt::format(
+			" AND (min_expansion >= {} OR min_expansion = 0)",
+			content_service.GetCurrentExpansion()
+		);
+
+		criteria += fmt::format(
+			" AND (max_expansion <= {} OR max_expansion = 0)",
+			content_service.GetCurrentExpansion()
+		);
+
+		std::vector<std::string> flags = content_service.GetContentFlags();
+		for (auto &flag: flags) {
+			flag = "'" + flag + "'";
+		}
+
+		criteria += fmt::format(
+			" AND (content_flags IS NULL OR content_flags IN ({}))",
+			implode(", ", flags)
+		);
+
+		return std::string(criteria);
+	};
+}
+
+#endif //EQEMU_CONTENT_FILTER_CRITERIA_H