Codefix: Add missing `const` inside script functions. (#12794)

Scripts do not modify items directly, marking them const enforces this.

src/industry.h

@@ -194,6 +194,17 @@ struct Industry : IndustryPool::PoolItem<&_industry_pool> {
 		return std::find_if(std::begin(this->accepted), std::end(this->accepted), [&cargo](const auto &a) { return a.cargo == cargo; });
 	}
 
+	/**
+	 * Get accepted cargo slot for a specific cargo type (const-variant).
+	 * @param cargo CargoID to find.
+	 * @return Iterator pointing to accepted cargo slot if it exists, or the end iterator.
+	 */
+	inline AcceptedCargoes::const_iterator GetCargoAccepted(CargoID cargo) const
+	{
+		if (!IsValidCargoID(cargo)) return std::end(this->accepted);
+		return std::find_if(std::begin(this->accepted), std::end(this->accepted), [&cargo](const auto &a) { return a.cargo == cargo; });
+	}
+
 	/**
 	 * Test if this industry accepts any cargo.
 	 * @return true iff the industry accepts any cargo.

src/script/api/script_cargolist.cpp

@@ -28,7 +28,7 @@ ScriptCargoList_IndustryAccepting::ScriptCargoList_IndustryAccepting(IndustryID
 {
 	if (!ScriptIndustry::IsValidIndustry(industry_id)) return;
 
-	Industry *ind = ::Industry::Get(industry_id);
+	const Industry *ind = ::Industry::Get(industry_id);
 	for (const auto &a : ind->accepted) {
 		if (::IsValidCargoID(a.cargo)) {
 			this->AddItem(a.cargo);
@@ -40,7 +40,7 @@ ScriptCargoList_IndustryProducing::ScriptCargoList_IndustryProducing(IndustryID
 {
 	if (!ScriptIndustry::IsValidIndustry(industry_id)) return;
 
-	Industry *ind = ::Industry::Get(industry_id);
+	const Industry *ind = ::Industry::Get(industry_id);
 	for (const auto &p : ind->produced) {
 		if (::IsValidCargoID(p.cargo)) {
 			this->AddItem(p.cargo);
@@ -52,7 +52,7 @@ ScriptCargoList_StationAccepting::ScriptCargoList_StationAccepting(StationID sta
 {
 	if (!ScriptStation::IsValidStation(station_id)) return;
 
-	Station *st = ::Station::Get(station_id);
+	const Station *st = ::Station::Get(station_id);
 	for (CargoID i = 0; i < NUM_CARGO; i++) {
 		if (HasBit(st->goods[i].status, GoodsEntry::GES_ACCEPTANCE)) this->AddItem(i);
 	}

src/script/api/script_goal.cpp

@@ -71,7 +71,7 @@
 {
 	EnforceDeityMode(false);
 	EnforcePrecondition(false, IsValidGoal(goal_id));
-	Goal *g = Goal::Get(goal_id);
+	const Goal *g = Goal::Get(goal_id);
 	EnforcePrecondition(false, IsValidGoalDestination((ScriptCompany::CompanyID)g->company, type, destination));
 
 	return ScriptObject::Command<CMD_SET_GOAL_DESTINATION>::Do(goal_id, (::GoalType)type, destination);
@@ -113,7 +113,7 @@
 	EnforcePrecondition(false, IsValidGoal(goal_id));
 	EnforceDeityMode(false);
 
-	Goal *g = Goal::Get(goal_id);
+	const Goal *g = Goal::Get(goal_id);
 	return g != nullptr && g->completed;
 }
 

src/script/api/script_industry.cpp

@@ -51,7 +51,7 @@
 
 /* static */ ScriptDate::Date ScriptIndustry::GetConstructionDate(IndustryID industry_id)
 {
-	Industry *i = Industry::GetIfValid(industry_id);
+	const Industry *i = Industry::GetIfValid(industry_id);
 	if (i == nullptr) return ScriptDate::DATE_INVALID;
 	return (ScriptDate::Date)i->construction_date.base();
 }
@@ -71,6 +71,7 @@
 	if (!IsValidIndustry(industry_id)) return CAS_NOT_ACCEPTED;
 	if (!ScriptCargo::IsValidCargo(cargo_id)) return CAS_NOT_ACCEPTED;
 
+	/* Not const because IndustryTemporarilyRefusesCargo tests a callback which needs a non-const object. */
 	Industry *i = ::Industry::Get(industry_id);
 
 	if (!i->IsCargoAccepted(cargo_id)) return CAS_NOT_ACCEPTED;
@@ -84,7 +85,7 @@
 	if (!IsValidIndustry(industry_id)) return -1;
 	if (!ScriptCargo::IsValidCargo(cargo_id)) return -1;
 
-	Industry *i = ::Industry::Get(industry_id);
+	const Industry *i = ::Industry::Get(industry_id);
 
 	auto it = i->GetCargoAccepted(cargo_id);
 	if (it == std::end(i->accepted)) return -1;
@@ -97,7 +98,7 @@
 	if (!IsValidIndustry(industry_id)) return -1;
 	if (!ScriptCargo::IsValidCargo(cargo_id)) return -1;
 
-	Industry *i = ::Industry::Get(industry_id);
+	const Industry *i = ::Industry::Get(industry_id);
 
 	auto it = i->GetCargoProduced(cargo_id);
 	if (it == std::end(i->produced)) return -1;
@@ -110,7 +111,7 @@
 	if (!IsValidIndustry(industry_id)) return -1;
 	if (!ScriptCargo::IsValidCargo(cargo_id)) return -1;
 
-	Industry *i = ::Industry::Get(industry_id);
+	const Industry *i = ::Industry::Get(industry_id);
 
 	auto it = i->GetCargoProduced(cargo_id);
 	if (it == std::end(i->produced)) return -1;
@@ -123,7 +124,7 @@
 	if (!IsValidIndustry(industry_id)) return -1;
 	if (!ScriptCargo::IsValidCargo(cargo_id)) return -1;
 
-	Industry *i = ::Industry::Get(industry_id);
+	const Industry *i = ::Industry::Get(industry_id);
 
 	auto it = i->GetCargoProduced(cargo_id);
 	if (it == std::end(i->produced)) return -1;
@@ -142,7 +143,7 @@
 {
 	if (!IsValidIndustry(industry_id)) return -1;
 
-	Industry *ind = ::Industry::Get(industry_id);
+	const Industry *ind = ::Industry::Get(industry_id);
 	return ind->stations_near.size();
 }
 
@@ -220,14 +221,14 @@
 
 /* static */ SQInteger ScriptIndustry::GetLastProductionYear(IndustryID industry_id)
 {
-	Industry *i = Industry::GetIfValid(industry_id);
+	const Industry *i = Industry::GetIfValid(industry_id);
 	if (i == nullptr) return 0;
 	return i->last_prod_year.base();
 }
 
 /* static */ ScriptDate::Date ScriptIndustry::GetCargoLastAcceptedDate(IndustryID industry_id, CargoID cargo_type)
 {
-	Industry *i = Industry::GetIfValid(industry_id);
+	const Industry *i = Industry::GetIfValid(industry_id);
 	if (i == nullptr) return ScriptDate::DATE_INVALID;
 
 	if (!::IsValidCargoID(cargo_type)) {
@@ -242,7 +243,7 @@
 
 /* static */ SQInteger ScriptIndustry::GetControlFlags(IndustryID industry_id)
 {
-	Industry *i = Industry::GetIfValid(industry_id);
+	const Industry *i = Industry::GetIfValid(industry_id);
 	if (i == nullptr) return 0;
 	return i->ctlflags;
 }
@@ -297,7 +298,7 @@
 
 /* static */ SQInteger ScriptIndustry::GetProductionLevel(IndustryID industry_id)
 {
-	Industry *i = Industry::GetIfValid(industry_id);
+	const Industry *i = Industry::GetIfValid(industry_id);
 	if (i == nullptr) return 0;
 	return i->prod_level;
 }

src/script/api/script_infrastructure.cpp

@@ -39,7 +39,7 @@
 	company = ScriptCompany::ResolveCompanyID(company);
 	if (company == ScriptCompany::COMPANY_INVALID) return 0;
 
-	::Company *c = ::Company::Get((::CompanyID)company);
+	const ::Company *c = ::Company::Get((::CompanyID)company);
 	switch (infra_type) {
 		case INFRASTRUCTURE_RAIL:
 			return c->infrastructure.GetRailTotal();
@@ -87,7 +87,7 @@
 	company = ScriptCompany::ResolveCompanyID(company);
 	if (company == ScriptCompany::COMPANY_INVALID || !_settings_game.economy.infrastructure_maintenance) return 0;
 
-	::Company *c = ::Company::Get((::CompanyID)company);
+	const ::Company *c = ::Company::Get((::CompanyID)company);
 	switch (infra_type) {
 		case INFRASTRUCTURE_RAIL: {
 			Money cost;

src/script/api/script_order.cpp

@@ -687,11 +687,11 @@ static void _DoCommandReturnSetOrderFlags(class ScriptInstance *instance)
 {
 	if (vehicle_type == ScriptVehicle::VT_AIR) {
 		if (ScriptTile::IsStationTile(origin_tile)) {
-			Station *orig_station = ::Station::GetByTile(origin_tile);
+			const Station *orig_station = ::Station::GetByTile(origin_tile);
 			if (orig_station != nullptr && orig_station->airport.tile != INVALID_TILE) origin_tile = orig_station->airport.tile;
 		}
 		if (ScriptTile::IsStationTile(dest_tile)) {
-			Station *dest_station = ::Station::GetByTile(dest_tile);
+			const Station *dest_station = ::Station::GetByTile(dest_tile);
 			if (dest_station != nullptr && dest_station->airport.tile != INVALID_TILE) dest_tile = dest_station->airport.tile;
 		}
 

src/script/api/script_stationlist.cpp

@@ -32,7 +32,7 @@ ScriptStationList_Vehicle::ScriptStationList_Vehicle(VehicleID vehicle_id)
 {
 	if (!ScriptVehicle::IsPrimaryVehicle(vehicle_id)) return;
 
-	Vehicle *v = ::Vehicle::Get(vehicle_id);
+	const Vehicle *v = ::Vehicle::Get(vehicle_id);
 
 	for (Order *o = v->GetFirstOrder(); o != nullptr; o = o->next) {
 		if (o->IsType(OT_GOTO_STATION)) this->AddItem(o->GetDestination());

src/script/api/script_story_page.cpp

@@ -114,8 +114,8 @@ static inline bool StoryPageElementTypeRequiresText(StoryPageElementType type)
 	EnforceDeityMode(false);
 	EnforcePrecondition(false, IsValidStoryPageElement(story_page_element_id));
 
-	StoryPageElement *pe = StoryPageElement::Get(story_page_element_id);
-	StoryPage *p = StoryPage::Get(pe->page);
+	const StoryPageElement *pe = StoryPageElement::Get(story_page_element_id);
+	const StoryPage *p = StoryPage::Get(pe->page);
 	::StoryPageElementType type = pe->type;
 
 	std::string encoded_text;

src/script/api/script_vehicle.cpp

@@ -462,7 +462,7 @@
 {
 	if (!IsPrimaryVehicle(vehicle_id)) return false;
 
-	Vehicle *v = ::Vehicle::Get(vehicle_id);
+	const Vehicle *v = ::Vehicle::Get(vehicle_id);
 	return v->orders != nullptr && v->orders->GetNumVehicles() > 1;
 }