isaacscript-common/src/classes/callbacks/PreRoomEntitySpawnFilter.ts

Helper functions and features for IsaacScript mods.

import type {
  EntityType,
  GridEntityXMLType,
} from "isaac-typescript-definitions";
import { ModCallback } from "isaac-typescript-definitions";
import type { ModCallbackCustom } from "../../enums/ModCallbackCustom";
import type { FireArgs, OptionalArgs } from "../private/CustomCallback";
import { CustomCallback } from "../private/CustomCallback";

type T = ModCallbackCustom.PRE_ROOM_ENTITY_SPAWN_FILTER;

export class PreRoomEntitySpawnFilter extends CustomCallback<T> {
  constructor() {
    super();

    this.callbacksUsed = [
      // 71
      [ModCallback.PRE_ROOM_ENTITY_SPAWN, this.preRoomEntitySpawn],
    ];
  }

  protected override shouldFire = (
    fireArgs: FireArgs<T>,
    optionalArgs: OptionalArgs<T>,
  ): boolean => {
    const [entityTypeOrGridEntityXMLType, variant, subType] = fireArgs;
    const [
      callbackEntityTypeOrGridEntityXMLType,
      callbackVariant,
      callbackSubType,
    ] = optionalArgs;

    return (
      (callbackEntityTypeOrGridEntityXMLType === undefined
        || callbackEntityTypeOrGridEntityXMLType
          === entityTypeOrGridEntityXMLType)
      && (callbackVariant === undefined || callbackVariant === variant)
      && (callbackSubType === undefined || callbackSubType === subType)
    );
  };

  // ModCallback.PRE_ROOM_ENTITY_SPAWN (71)
  private readonly preRoomEntitySpawn = (
    entityTypeOrGridEntityXMLType: EntityType | GridEntityXMLType,
    variant: int,
    subType: int,
    gridIndex: int,
    initSeed: Seed,
  ) =>
    this.fire(
      entityTypeOrGridEntityXMLType,
      variant,
      subType,
      gridIndex,
      initSeed,
    );
}