ExtensionFunctionsWhitelist.h

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/*
 * Copyright 2017 MapD Technologies, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * @file    ExtensionFunctionsWhitelist.h
 * @author  Alex Suhan <alex@mapd.com>
 * @brief   Supported runtime functions management and retrieval.
 *
 * Copyright (c) 2016 MapD Technologies, Inc.  All rights reserved.
 */

#ifndef QUERYENGINE_EXTENSIONFUNCTIONSWHITELIST_H
#define QUERYENGINE_EXTENSIONFUNCTIONSWHITELIST_H

#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#include "../Shared/sqltypes.h"

enum class ExtArgumentType {
  Int8,
  Int16,
  Int32,
  Int64,
  Float,
  Double,
  Void,
  PInt8,
  PInt16,
  PInt32,
  PInt64,
  PFloat,
  PDouble,
  Bool,
  ArrayInt8,
  ArrayInt16,
  ArrayInt32,
  ArrayInt64,
  ArrayFloat,
  ArrayDouble,
  GeoPoint,
  GeoLineString,
  Cursor,
  GeoPolygon,
  GeoMultiPolygon
};

SQLTypeInfo ext_arg_type_to_type_info(const ExtArgumentType ext_arg_type);

class ExtensionFunction {
 public:
  ExtensionFunction(const std::string& name,
                    const std::vector<ExtArgumentType>& args,
                    const ExtArgumentType ret)
      : name_(name), args_(args), ret_(ret) {}

  const std::string& getName() const { return name_; }

  const std::vector<ExtArgumentType>& getArgs() const { return args_; }

  const ExtArgumentType getRet() const { return ret_; }
  std::string toString() const;

 private:
  const std::string name_;
  const std::vector<ExtArgumentType> args_;
  const ExtArgumentType ret_;
};

class ExtensionFunctionsWhitelist {
 public:
  static void add(const std::string& json_func_sigs);

  static void addUdfs(const std::string& json_func_sigs);

  static void clearRTUdfs();
  static void addRTUdfs(const std::string& json_func_sigs);

  static std::vector<ExtensionFunction>* get(const std::string& name);

  static std::vector<ExtensionFunction>* get_udf(const std::string& name);

  static std::vector<ExtensionFunction> get_ext_funcs(const std::string& name);

  static std::vector<ExtensionFunction> get_ext_funcs(const std::string& name,
                                                      size_t arity);

  static std::vector<ExtensionFunction> get_ext_funcs(const std::string& name,
                                                      size_t arity,
                                                      const SQLTypeInfo& rtype);

  static std::string toString(const std::vector<ExtensionFunction>& ext_funcs,
                              std::string tab = "");
  static std::string toString(const std::vector<SQLTypeInfo>& arg_types);
  static std::string toString(const std::vector<ExtArgumentType>& sig_types);

  static std::vector<std::string> getLLVMDeclarations(
      const std::unordered_set<std::string>& udf_decls);

 private:
  static void addCommon(
      std::unordered_map<std::string, std::vector<ExtensionFunction>>& sigs,
      const std::string& json_func_sigs);

 private:
  // Function overloading not supported, they're uniquely identified by name.
  static std::unordered_map<std::string, std::vector<ExtensionFunction>> functions_;
  static std::unordered_map<std::string, std::vector<ExtensionFunction>> udf_functions_;
  static std::unordered_map<std::string, std::vector<ExtensionFunction>>
      rt_udf_functions_;
};

#endif  // QUERYENGINE_EXTENSIONFUNCTIONSWHITELIST_H