mirror of
https://github.com/google/blockly.git
synced 2026-05-12 15:10:11 +02:00
Beka Westberg
76 lines
2.5 KiB
TypeScript
76 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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/**
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* @fileoverview Fields can be created based on a JSON definition. This file
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* contains methods for registering those JSON definitions, and building the
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* fields based on JSON.
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*/
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/**
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* Fields can be created based on a JSON definition. This file
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* contains methods for registering those JSON definitions, and building the
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* fields based on JSON.
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* @namespace Blockly.fieldRegistry
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*/
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import type {Field} from './field';
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import type {IRegistrableField} from './interfaces/i_registrable_field';
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import * as registry from './registry';
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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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* @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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* @alias Blockly.fieldRegistry.register
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*/
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export function register(type: string, fieldClass: IRegistrableField) {
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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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* @param type The field type name as used in the JSON definition.
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* @alias Blockly.fieldRegistry.unregister
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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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* @param options A JSON object with a type and options specific to the field
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* type.
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* @return The new field instance or null if a field wasn't found with the given
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* type name
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* @alias Blockly.fieldRegistry.fromJson
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* @internal
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*/
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export function fromJson(options: AnyDuringMigration): Field|null {
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const fieldObject =
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registry.getObject(registry.Type.FIELD, options['type']) as
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IRegistrableField |
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null;
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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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}
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return fieldObject.fromJson(options);
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}
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