refactor: update the variable interfaces. (#8388)

core/interfaces/i_variable_map.ts

@@ -4,8 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import {IVariableModel} from './i_variable_model.js';
-import {State} from '../serialization/variables.js';
+import type {IVariableModel, IVariableState} from './i_variable_model.js';
 
 /**
  * Variable maps are container objects responsible for storing and managing the
@@ -14,7 +13,7 @@ import {State} from '../serialization/variables.js';
  * Any of these methods may define invariants about which names and types are
  * legal, and throw if they are not met.
  */
-export interface IVariableMap<T extends IVariableModel, U extends State> {
+export interface IVariableMap<T extends IVariableModel<IVariableState>> {
   /* Returns the variable corresponding to the given ID, or null if none. */
   getVariableById(id: string): T | null;
 
@@ -46,6 +45,9 @@ export interface IVariableMap<T extends IVariableModel, U extends State> {
    */
   createVariable(name: string, id?: string, type?: string | null): T;
 
+  /* Adds a variable to this variable map. */
+  addVariable(variable: T): void;
+
   /**
    * Changes the name of the given variable to the name provided and returns the
    * renamed variable.
@@ -60,13 +62,4 @@ export interface IVariableMap<T extends IVariableModel, U extends State> {
 
   /* Removes all variables from this variable map. */
   clear(): void;
-
-  /* Returns an object representing the serialized state of the variable. */
-  saveVariable(variable: T): U;
-
-  /**
-   * Creates a variable in this variable map corresponding to the given state
-   * (produced by a call to `saveVariable`).
-   */
-  loadVariable(state: U): T;
 }

core/interfaces/i_variable_model.ts

@@ -4,8 +4,10 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import type {Workspace} from '../workspace.js';
+
 /* Representation of a variable. */
-export interface IVariableModel {
+export interface IVariableModel<T extends IVariableState> {
   /* Returns the unique ID of this variable. */
   getId(): string;
 
@@ -23,4 +25,33 @@ export interface IVariableModel {
 
   /* Sets the type of this variable. */
   setType(type: string): this;
+
+  getWorkspace(): Workspace;
+
+  /* Serializes this variable */
+  save(): T;
+}
+
+export interface IVariableModelStatic<T extends IVariableState> {
+  new (
+    workspace: Workspace,
+    name: string,
+    type?: string,
+    id?: string,
+  ): IVariableModel<T>;
+
+  /**
+   * Creates a new IVariableModel corresponding to the given state on the
+   * specified workspace. This method must be static in your implementation.
+   */
+  load(state: T, workspace: Workspace): IVariableModel<T>;
+}
+
+/**
+ * Represents the state of a given variable.
+ */
+export interface IVariableState {
+  name: string;
+  id: string;
+  type?: string;
 }

core/registry.ts

@@ -24,6 +24,12 @@ import type {IPaster} from './interfaces/i_paster.js';
 import type {ICopyData, ICopyable} from './interfaces/i_copyable.js';
 import type {IConnectionPreviewer} from './interfaces/i_connection_previewer.js';
 import type {IDragger} from './interfaces/i_dragger.js';
+import type {
+  IVariableModel,
+  IVariableModelStatic,
+  IVariableState,
+} from './interfaces/i_variable_model.js';
+import type {IVariableMap} from './interfaces/i_variable_map.js';
 
 /**
  * A map of maps. With the keys being the type and name of the class we are
@@ -109,6 +115,14 @@ export class Type<_T> {
 
   /** @internal */
   static PASTER = new Type<IPaster<ICopyData, ICopyable<ICopyData>>>('paster');
+
+  static VARIABLE_MODEL = new Type<IVariableModelStatic<IVariableState>>(
+    'variableModel',
+  );
+
+  static VARIABLE_MAP = new Type<IVariableMap<IVariableModel<IVariableState>>>(
+    'variableMap',
+  );
 }
 
 /**

core/serialization/variables.ts

@@ -7,20 +7,13 @@
 // Former goog.module ID: Blockly.serialization.variables
 
 import type {ISerializer} from '../interfaces/i_serializer.js';
+import type {IVariableState} from '../interfaces/i_variable_model.js';
 import type {Workspace} from '../workspace.js';
 
 import * as priorities from './priorities.js';
+import * as registry from '../registry.js';
 import * as serializationRegistry from './registry.js';
 
-/**
- * Represents the state of a given variable.
- */
-export interface State {
-  name: string;
-  id: string;
-  type: string | undefined;
-}
-
 /**
  * Serializer for saving and loading variable state.
  */
@@ -40,23 +33,9 @@ export class VariableSerializer implements ISerializer {
    * @returns The state of the workspace's variables, or null if there are no
    *     variables.
    */
-  save(workspace: Workspace): State[] | null {
-    const variableStates = [];
-    for (const variable of workspace.getAllVariables()) {
-      const state = {
-        'name': variable.name,
-        'id': variable.getId(),
-      };
-      if (variable.type) {
-        (state as AnyDuringMigration)['type'] = variable.type;
-      }
-      variableStates.push(state);
-    }
-    // AnyDuringMigration because:  Type '{ name: string; id: string; }[] |
-    // null' is not assignable to type 'State[] | null'.
-    return (
-      variableStates.length ? variableStates : null
-    ) as AnyDuringMigration;
+  save(workspace: Workspace): IVariableState[] | null {
+    const variableStates = workspace.getAllVariables().map((v) => v.save());
+    return variableStates.length ? variableStates : null;
   }
 
   /**
@@ -66,14 +45,14 @@ export class VariableSerializer implements ISerializer {
    * @param state The state of the variables to deserialize.
    * @param workspace The workspace to deserialize into.
    */
-  load(state: State[], workspace: Workspace) {
-    for (const varState of state) {
-      workspace.createVariable(
-        varState['name'],
-        varState['type'],
-        varState['id'],
-      );
-    }
+  load(state: IVariableState[], workspace: Workspace) {
+    const VariableModel = registry.getObject(
+      registry.Type.VARIABLE_MODEL,
+      registry.DEFAULT,
+    );
+    state.forEach((s) => {
+      VariableModel?.load(s, workspace);
+    });
   }
 
   /**

core/variable_model.ts

@@ -15,8 +15,9 @@
 import './events/events_var_create.js';
 
 import * as idGenerator from './utils/idgenerator.js';
+import * as registry from './registry.js';
 import type {Workspace} from './workspace.js';
-import {IVariableModel} from './interfaces/i_variable_model.js';
+import {IVariableModel, IVariableState} from './interfaces/i_variable_model.js';
 
 /**
  * Class for a variable model.
@@ -24,7 +25,7 @@ import {IVariableModel} from './interfaces/i_variable_model.js';
  *
  * @see {Blockly.FieldVariable}
  */
-export class VariableModel implements IVariableModel {
+export class VariableModel implements IVariableModel<IVariableState> {
   type: string;
   private readonly id_: string;
 
@@ -95,6 +96,30 @@ export class VariableModel implements IVariableModel {
     return this;
   }
 
+  getWorkspace(): Workspace {
+    return this.workspace;
+  }
+
+  save(): IVariableState {
+    const state: IVariableState = {
+      'name': this.getName(),
+      'id': this.getId(),
+    };
+    const type = this.getType();
+    if (type) {
+      state['type'] = type;
+    }
+
+    return state;
+  }
+
+  static load(state: IVariableState, workspace: Workspace) {
+    // TODO(adodson): Once VariableMap implements IVariableMap, directly
+    // construct a variable, retrieve the variable map from the workspace,
+    // add the variable to that variable map, and fire a VAR_CREATE event.
+    workspace.createVariable(state['name'], state['type'], state['id']);
+  }
+
   /**
    * A custom compare function for the VariableModel objects.
    *
@@ -108,3 +133,9 @@ export class VariableModel implements IVariableModel {
     return var1.name.localeCompare(var2.name, undefined, {sensitivity: 'base'});
   }
 }
+
+registry.register(
+  registry.Type.VARIABLE_MODEL,
+  registry.DEFAULT,
+  VariableModel,
+);