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82 lines
2.5 KiB
TypeScript
82 lines
2.5 KiB
TypeScript
/**
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* @license
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* Copyright 2019 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import * as goog from '../closure/goog/goog.js';
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goog.declareModuleId('Blockly.fieldRegistry');
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import type {Field, FieldProto} from './field.js';
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import * as registry from './registry.js';
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interface RegistryOptions {
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type: string;
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[key: string]: unknown;
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}
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/**
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* Registers a field type.
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* fieldRegistry.fromJson uses this registry to
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* find the appropriate field type.
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*
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* @param type The field type name as used in the JSON definition.
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* @param fieldClass The field class containing a fromJson function that can
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* construct an instance of the field.
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* @throws {Error} if the type name is empty, the field is already registered,
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* or the fieldClass is not an object containing a fromJson function.
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*/
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export function register(type: string, fieldClass: FieldProto) {
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registry.register(registry.Type.FIELD, type, fieldClass);
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}
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/**
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* Unregisters the field registered with the given type.
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*
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* @param type The field type name as used in the JSON definition.
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*/
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export function unregister(type: string) {
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registry.unregister(registry.Type.FIELD, type);
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}
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/**
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* Construct a Field from a JSON arg object.
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* Finds the appropriate registered field by the type name as registered using
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* fieldRegistry.register.
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*
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* @param options A JSON object with a type and options specific to the field
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* type.
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* @returns The new field instance or null if a field wasn't found with the
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* given type name
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* @internal
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*/
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export function fromJson<T>(options: RegistryOptions): Field<T>|null {
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return TEST_ONLY.fromJsonInternal(options);
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}
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/**
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* Private version of fromJson for stubbing in tests.
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*
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* @param options
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*/
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function fromJsonInternal<T>(options: RegistryOptions): Field<T>|null {
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const fieldObject = registry.getObject(registry.Type.FIELD, options.type);
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if (!fieldObject) {
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console.warn(
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'Blockly could not create a field of type ' + options['type'] +
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'. The field is probably not being registered. This could be because' +
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' the file is not loaded, the field does not register itself (Issue' +
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' #1584), or the registration is not being reached.');
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return null;
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} else if (typeof (fieldObject as any).fromJson !== 'function') {
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throw new TypeError('returned Field was not a IRegistrableField');
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} else {
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type fromJson = (options: {}) => Field<T>;
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return (fieldObject as unknown as {fromJson: fromJson}).fromJson(options);
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}
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}
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export const TEST_ONLY = {
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fromJsonInternal,
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};
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