# HG changeset patch
# User J0anJosep <juanjo.ng.83@gmail.com>
# Date 2022-01-08 11:01:37
# Node ID fdb7183fad7426497de0d1c9b801fc9a73a8de4d
# Parent  dd1a8cf75da80ef86fdbc109f0fd0c482acf6ab5

Cleanup #9725: Replace cmd_helper related functions and remove cmd_helper.h.

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -87,7 +87,6 @@ add_files(
     clear_cmd.cpp
     clear_func.h
     clear_map.h
-    cmd_helper.h
     command.cpp
     command_func.h
     command_type.h
diff --git a/src/bridge_gui.cpp b/src/bridge_gui.cpp
--- a/src/bridge_gui.cpp
+++ b/src/bridge_gui.cpp
@@ -20,7 +20,6 @@
 #include "sortlist_type.h"
 #include "widgets/dropdown_func.h"
 #include "core/geometry_func.hpp"
-#include "cmd_helper.h"
 #include "tunnelbridge_map.h"
 #include "road_gui.h"
 #include "tunnelbridge_cmd.h"
diff --git a/src/cmd_helper.h b/src/cmd_helper.h
deleted file mode 100644
--- a/src/cmd_helper.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * This file is part of OpenTTD.
- * OpenTTD 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.
- * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @file cmd_helper.h Helper functions to extract data from command parameters. */
-
-#ifndef CMD_HELPER_H
-#define CMD_HELPER_H
-
-#include "core/enum_type.hpp"
-#include "core/bitmath_func.hpp"
-
-/**
- * Extracts a given type from a value.
- * @tparam T The type of data we're looking for.
- * @tparam S The offset in the data.
- * @tparam N The amount of bits to read.
- * @tparam U The type of data passed to us.
- * @param v The data to extract the value from.
- */
-template<typename T, uint S, uint N, typename U> static inline T Extract(U v)
-{
-	/* Check if there are enough bits in v */
-	static_assert(N == EnumPropsT<T>::num_bits);
-	static_assert(S + N <= sizeof(U) * 8);
-	static_assert(EnumPropsT<T>::end <= (1 << N));
-	U masked = GB(v, S, N);
-	return IsInsideMM(masked, EnumPropsT<T>::begin, EnumPropsT<T>::end) ? (T)masked : EnumPropsT<T>::invalid;
-}
-
-/**
- * Check if an enum value is inside it's valid values.
- * @tparam T Type of enum.
- * @param v The value to validate
- * @return True if enum is valid.
- */
-template <typename T> static constexpr inline bool IsEnumValid(T v) noexcept
-{
-	return IsInsideMM(v, EnumPropsT<T>::begin, EnumPropsT<T>::end);
-}
-
-#endif /* CMD_HELPER_H */
diff --git a/src/company_cmd.cpp b/src/company_cmd.cpp
--- a/src/company_cmd.cpp
+++ b/src/company_cmd.cpp
@@ -14,7 +14,6 @@
 #include "core/backup_type.hpp"
 #include "town.h"
 #include "news_func.h"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "network/network.h"
 #include "network/network_func.h"
diff --git a/src/gfx_func.h b/src/gfx_func.h
--- a/src/gfx_func.h
+++ b/src/gfx_func.h
@@ -174,6 +174,17 @@ int GetCharacterHeight(FontSize size);
 
 extern DrawPixelInfo *_cur_dpi;
 
+/**
+ * Checks if a Colours value is valid.
+ *
+ * @param colours The value to check
+ * @return true if the given value is a valid Colours.
+ */
+static inline bool IsValidColours(Colours colours)
+{
+	return colours < COLOUR_END;
+}
+
 TextColour GetContrastColour(uint8 background, uint8 threshold = 128);
 
 /**
diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -8,7 +8,6 @@
 /** @file group_cmd.cpp Handling of the engine groups */
 
 #include "stdafx.h"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "train.h"
 #include "vehiclelist.h"
diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -40,7 +40,6 @@
 #include "object_base.h"
 #include "game/game.hpp"
 #include "error.h"
-#include "cmd_helper.h"
 #include "string_func.h"
 #include "industry_cmd.h"
 #include "landscape_cmd.h"
diff --git a/src/misc_cmd.cpp b/src/misc_cmd.cpp
--- a/src/misc_cmd.cpp
+++ b/src/misc_cmd.cpp
@@ -10,7 +10,6 @@
 #include "stdafx.h"
 #include "command_func.h"
 #include "economy_func.h"
-#include "cmd_helper.h"
 #include "window_func.h"
 #include "textbuf_gui.h"
 #include "network/network.h"
diff --git a/src/order_cmd.cpp b/src/order_cmd.cpp
--- a/src/order_cmd.cpp
+++ b/src/order_cmd.cpp
@@ -9,7 +9,6 @@
 
 #include "stdafx.h"
 #include "debug.h"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "company_func.h"
 #include "news_func.h"
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -8,7 +8,6 @@
 /** @file rail_cmd.cpp Handling of rail tiles. */
 
 #include "stdafx.h"
-#include "cmd_helper.h"
 #include "viewport_func.h"
 #include "command_func.h"
 #include "depot_base.h"
@@ -966,7 +965,7 @@ CommandCost CmdRemoveRailroadTrack(DoCom
 CommandCost CmdBuildTrainDepot(DoCommandFlag flags, TileIndex tile, RailType railtype, DiagDirection dir)
 {
 	/* check railtype and valid direction for depot (0 through 3), 4 in total */
-	if (!ValParamRailtype(railtype) || !IsEnumValid(dir)) return CMD_ERROR;
+	if (!ValParamRailtype(railtype) || !IsValidDiagDirection(dir)) return CMD_ERROR;
 
 	Slope tileh = GetTileSlope(tile);
 
diff --git a/src/road_cmd.cpp b/src/road_cmd.cpp
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -8,7 +8,6 @@
 /** @file road_cmd.cpp Commands related to road tiles. */
 
 #include "stdafx.h"
-#include "cmd_helper.h"
 #include "road.h"
 #include "road_internal.h"
 #include "viewport_func.h"
@@ -638,7 +637,7 @@ CommandCost CmdBuildRoad(DoCommandFlag f
 	}
 
 	/* do not allow building 'zero' road bits, code wouldn't handle it */
-	if (pieces == ROAD_NONE || !IsEnumValid(pieces) || !IsEnumValid(toggle_drd)) return CMD_ERROR;
+	if (pieces == ROAD_NONE || !IsValidRoadBits(pieces) || !IsValidDisallowedRoadDirections(toggle_drd)) return CMD_ERROR;
 	if (!ValParamRoadType(rt)) return CMD_ERROR;
 
 	Slope tileh = GetTileSlope(tile);
@@ -979,7 +978,7 @@ CommandCost CmdBuildLongRoad(DoCommandFl
 {
 	if (end_tile >= MapSize()) return CMD_ERROR;
 
-	if (!ValParamRoadType(rt) || !IsEnumValid(axis) || !IsEnumValid(drd)) return CMD_ERROR;
+	if (!ValParamRoadType(rt) || !IsValidAxis(axis) || !IsValidDisallowedRoadDirections(drd)) return CMD_ERROR;
 
 	/* Only drag in X or Y direction dictated by the direction variable */
 	if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return CMD_ERROR; // x-axis
@@ -1075,7 +1074,7 @@ std::tuple<CommandCost, Money> CmdRemove
 	CommandCost cost(EXPENSES_CONSTRUCTION);
 
 	if (end_tile >= MapSize()) return { CMD_ERROR, 0 };
-	if (!ValParamRoadType(rt) || !IsEnumValid(axis)) return { CMD_ERROR, 0 };
+	if (!ValParamRoadType(rt) || !IsValidAxis(axis)) return { CMD_ERROR, 0 };
 
 	/* Only drag in X or Y direction dictated by the direction variable */
 	if (axis == AXIS_X && TileY(start_tile) != TileY(end_tile)) return { CMD_ERROR, 0 }; // x-axis
@@ -1140,7 +1139,7 @@ std::tuple<CommandCost, Money> CmdRemove
  */
 CommandCost CmdBuildRoadDepot(DoCommandFlag flags, TileIndex tile, RoadType rt, DiagDirection dir)
 {
-	if (!ValParamRoadType(rt) || !IsEnumValid(dir)) return CMD_ERROR;
+	if (!ValParamRoadType(rt) || !IsValidDiagDirection(dir)) return CMD_ERROR;
 
 	CommandCost cost(EXPENSES_CONSTRUCTION);
 
diff --git a/src/road_map.h b/src/road_map.h
--- a/src/road_map.h
+++ b/src/road_map.h
@@ -283,6 +283,17 @@ static inline bool HasTownOwnedRoad(Tile
 }
 
 /**
+ * Checks if a DisallowedRoadDirections is valid.
+ *
+ * @param wc The value to check
+ * @return true if the given value is a valid DisallowedRoadDirections.
+ */
+static inline bool IsValidDisallowedRoadDirections(DisallowedRoadDirections drt)
+{
+	return drt < DRD_END;
+}
+
+/**
  * Gets the disallowed directions
  * @param t the tile to get the directions from
  * @return the disallowed directions
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -10,7 +10,6 @@
 #include "stdafx.h"
 #include "aircraft.h"
 #include "bridge_map.h"
-#include "cmd_helper.h"
 #include "viewport_func.h"
 #include "viewport_kdtree.h"
 #include "command_func.h"
@@ -1257,7 +1256,7 @@ CommandCost CmdBuildRailStation(DoComman
 	CommandCost ret = CheckIfAuthorityAllowsNewStation(tile_org, flags);
 	if (ret.Failed()) return ret;
 
-	if (!ValParamRailtype(rt) || !IsEnumValid(axis)) return CMD_ERROR;
+	if (!ValParamRailtype(rt) || !IsValidAxis(axis)) return CMD_ERROR;
 
 	/* Check if the given station class is valid */
 	if ((uint)spec_class >= StationClass::GetClassCount() || spec_class == STAT_CLASS_WAYP) return CMD_ERROR;
@@ -1818,7 +1817,7 @@ static CommandCost FindJoiningRoadStop(S
  */
 CommandCost CmdBuildRoadStop(DoCommandFlag flags, TileIndex tile, uint8 width, uint8 length, RoadStopType stop_type, bool is_drive_through, DiagDirection ddir, RoadType rt, StationID station_to_join, bool adjacent)
 {
-	if (!ValParamRoadType(rt) || !IsEnumValid(ddir) || stop_type >= ROADSTOP_END) return CMD_ERROR;
+	if (!ValParamRoadType(rt) || !IsValidDiagDirection(ddir) || stop_type >= ROADSTOP_END) return CMD_ERROR;
 	bool reuse = (station_to_join != NEW_STATION);
 	if (!reuse) station_to_join = INVALID_STATION;
 	bool distant_join = (station_to_join != INVALID_STATION);
diff --git a/src/story.cpp b/src/story.cpp
--- a/src/story.cpp
+++ b/src/story.cpp
@@ -10,7 +10,6 @@
 #include "stdafx.h"
 #include "story_base.h"
 #include "core/pool_func.hpp"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "company_base.h"
 #include "company_func.h"
@@ -144,7 +143,9 @@ void StoryPageButtonData::SetVehicleType
 /** Get the button background colour. */
 Colours StoryPageButtonData::GetColour() const
 {
-	return Extract<Colours, 0, 8>(this->referenced_id);
+	Colours colour = (Colours)GB(this->referenced_id, 0, 8);
+	if (!IsValidColours(colour)) return INVALID_COLOUR;
+	return colour;
 }
 
 StoryPageButtonFlags StoryPageButtonData::GetFlags() const
@@ -155,7 +156,9 @@ StoryPageButtonFlags StoryPageButtonData
 /** Get the mouse cursor used while waiting for input for the button. */
 StoryPageButtonCursor StoryPageButtonData::GetCursor() const
 {
-	return Extract<StoryPageButtonCursor, 8, 8>(this->referenced_id);
+	StoryPageButtonCursor cursor = (StoryPageButtonCursor)GB(this->referenced_id, 8, 8);
+	if (!IsValidStoryPageButtonCursor(cursor)) return INVALID_SPBC;
+	return cursor;
 }
 
 /** Get the type of vehicles that are accepted by the button */
diff --git a/src/story_base.h b/src/story_base.h
--- a/src/story_base.h
+++ b/src/story_base.h
@@ -113,6 +113,17 @@ enum StoryPageButtonCursor : byte {
 /** Define basic enum properties */
 template <> struct EnumPropsT<StoryPageButtonCursor> : MakeEnumPropsT<StoryPageButtonCursor, byte, SPBC_MOUSE, SPBC_END, INVALID_SPBC, 8> {};
 
+/**
+ * Checks if a StoryPageButtonCursor value is valid.
+ *
+ * @param wc The value to check
+ * @return true if the given value is a valid StoryPageButtonCursor.
+ */
+static inline bool IsValidStoryPageButtonCursor(StoryPageButtonCursor cursor)
+{
+	return cursor < SPBC_END;
+}
+
 /** Helper to construct packed "id" values for button-type StoryPageElement */
 struct StoryPageButtonData {
 	uint32 referenced_id;
diff --git a/src/timetable_cmd.cpp b/src/timetable_cmd.cpp
--- a/src/timetable_cmd.cpp
+++ b/src/timetable_cmd.cpp
@@ -13,7 +13,6 @@
 #include "date_func.h"
 #include "window_func.h"
 #include "vehicle_base.h"
-#include "cmd_helper.h"
 #include "timetable_cmd.h"
 
 #include "table/strings.h"
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -14,7 +14,6 @@
 #include "landscape.h"
 #include "viewport_func.h"
 #include "viewport_kdtree.h"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "industry.h"
 #include "station_base.h"
diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -14,7 +14,6 @@
 #include "stdafx.h"
 #include "newgrf_object.h"
 #include "viewport_func.h"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "town.h"
 #include "train.h"
diff --git a/src/vehicle_cmd.cpp b/src/vehicle_cmd.cpp
--- a/src/vehicle_cmd.cpp
+++ b/src/vehicle_cmd.cpp
@@ -11,7 +11,6 @@
 #include "roadveh.h"
 #include "news_func.h"
 #include "airport.h"
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "company_func.h"
 #include "train.h"
diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -8,7 +8,6 @@
 /** @file water_cmd.cpp Handling of water tiles. */
 
 #include "stdafx.h"
-#include "cmd_helper.h"
 #include "landscape.h"
 #include "viewport_func.h"
 #include "command_func.h"
@@ -100,7 +99,7 @@ static void MarkCanalsAndRiversAroundDir
  */
 CommandCost CmdBuildShipDepot(DoCommandFlag flags, TileIndex tile, Axis axis)
 {
-	if (!IsEnumValid(axis)) return CMD_ERROR;
+	if (!IsValidAxis(axis)) return CMD_ERROR;
 	TileIndex tile2 = tile + (axis == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));
 
 	if (!HasTileWaterGround(tile) || !HasTileWaterGround(tile2)) {
@@ -439,7 +438,7 @@ bool RiverModifyDesertZone(TileIndex til
  */
 CommandCost CmdBuildCanal(DoCommandFlag flags, TileIndex tile, TileIndex start_tile, WaterClass wc, bool diagonal)
 {
-	if (start_tile >= MapSize() || !IsEnumValid(wc)) return CMD_ERROR;
+	if (start_tile >= MapSize() || !IsValidWaterClass(wc)) return CMD_ERROR;
 
 	/* Outside of the editor you can only build canals, not oceans */
 	if (wc != WATER_CLASS_CANAL && _game_mode != GM_EDITOR) return CMD_ERROR;
diff --git a/src/water_map.h b/src/water_map.h
--- a/src/water_map.h
+++ b/src/water_map.h
@@ -53,6 +53,17 @@ enum WaterClass : byte {
 /** Helper information for extract tool. */
 template <> struct EnumPropsT<WaterClass> : MakeEnumPropsT<WaterClass, byte, WATER_CLASS_SEA, WATER_CLASS_INVALID, WATER_CLASS_INVALID, 2> {};
 
+/**
+ * Checks if a water class is valid.
+ *
+ * @param wc The value to check
+ * @return true if the given value is a valid water class.
+ */
+static inline bool IsValidWaterClass(WaterClass wc)
+{
+	return wc < WATER_CLASS_INVALID;
+}
+
 /** Sections of the water depot. */
 enum DepotPart {
 	DEPOT_PART_NORTH = 0, ///< Northern part of a depot.
diff --git a/src/waypoint_cmd.cpp b/src/waypoint_cmd.cpp
--- a/src/waypoint_cmd.cpp
+++ b/src/waypoint_cmd.cpp
@@ -9,7 +9,6 @@
 
 #include "stdafx.h"
 
-#include "cmd_helper.h"
 #include "command_func.h"
 #include "landscape.h"
 #include "bridge_map.h"
@@ -175,7 +174,7 @@ extern CommandCost CanExpandRailStation(
  */
 CommandCost CmdBuildRailWaypoint(DoCommandFlag flags, TileIndex start_tile, Axis axis, byte width, byte height, StationClassID spec_class, byte spec_index, StationID station_to_join, bool adjacent)
 {
-	if (!IsEnumValid(axis)) return CMD_ERROR;
+	if (!IsValidAxis(axis)) return CMD_ERROR;
 	/* Check if the given station class is valid */
 	if (spec_class != STAT_CLASS_WAYP) return CMD_ERROR;
 	if (spec_index >= StationClass::Get(spec_class)->GetSpecCount()) return CMD_ERROR;