mirror of
https://github.com/google/blockly.git
synced 2026-01-08 17:40:09 +01:00
96935c2502
* fix: remove duplicate serialization hook implementations * feat: add backwards compatibility to field serialization * feat: add support for serializing old mutator hooks * fix: build * fix: refactor field changes into helpers * fix: typo * fix: removing xmlns * tests: add tests for serialization and deserialization of mutator hooks * fix: switch to early returns
680 lines
21 KiB
JavaScript
680 lines
21 KiB
JavaScript
/**
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* @license
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* Copyright 2021 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 Handles serializing blocks to plain JavaScript objects only
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* containing state.
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*/
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'use strict';
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goog.module('Blockly.serialization.blocks');
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goog.module.declareLegacyNamespace();
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const {BadConnectionCheck, MissingBlockType, MissingConnection, RealChildOfShadow} = goog.require('Blockly.serialization.exceptions');
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// eslint-disable-next-line no-unused-vars
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const Block = goog.requireType('Blockly.Block');
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// eslint-disable-next-line no-unused-vars
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const Connection = goog.requireType('Blockly.Connection');
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const Events = goog.require('Blockly.Events');
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// eslint-disable-next-line no-unused-vars
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const {ISerializer} = goog.requireType('Blockly.serialization.ISerializer');
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const Size = goog.require('Blockly.utils.Size');
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// eslint-disable-next-line no-unused-vars
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const Workspace = goog.requireType('Blockly.Workspace');
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const Xml = goog.require('Blockly.Xml');
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const inputTypes = goog.require('Blockly.inputTypes');
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const priorities = goog.require('Blockly.serialization.priorities');
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const serializationRegistry = goog.require('Blockly.serialization.registry');
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// TODO: Remove this once lint is fixed.
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/* eslint-disable no-use-before-define */
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/**
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* Represents the state of a connection.
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* @typedef {{
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* shadow: (!State|undefined),
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* block: (!State|undefined)
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* }}
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*/
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var ConnectionState;
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exports.ConnectionState = ConnectionState;
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/**
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* Represents the state of a given block.
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* @typedef {{
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* type: string,
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* id: (string|undefined),
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* x: (number|undefined),
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* y: (number|undefined),
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* collapsed: (boolean|undefined),
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* enabled: (boolean|undefined),
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* editable: (boolean|undefined),
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* deletable: (boolean|undefined),
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* movable: (boolean|undefined),
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* inline: (boolean|undefined),
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* data: (string|undefined),
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* extra-state: (*|undefined),
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* icons: (!Object<string, *>|undefined),
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* fields: (!Object<string, *>|undefined),
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* inputs: (!Object<string, !ConnectionState>|undefined),
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* next: (!ConnectionState|undefined)
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* }}
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*/
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var State;
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exports.State = State;
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/**
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* Returns the state of the given block as a plain JavaScript object.
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* @param {!Block} block The block to serialize.
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* @param {{addCoordinates: (boolean|undefined), addInputBlocks:
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* (boolean|undefined), addNextBlocks: (boolean|undefined)}=} param1
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* addCoordinates: If true, the coordinates of the block are added to the
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* serialized state. False by default.
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* addinputBlocks: If true, children of the block which are connected to
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* inputs will be serialized. True by default.
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* addNextBlocks: If true, children of the block which are connected to the
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* block's next connection (if it exists) will be serialized.
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* True by default.
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* @return {?State} The serialized state of the block, or null if the block
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* could not be serialied (eg it was an insertion marker).
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*/
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const save = function(
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block,
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{
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addCoordinates = false,
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addInputBlocks = true,
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addNextBlocks = true
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} = {}
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) {
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if (block.isInsertionMarker()) {
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return null;
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}
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const state = {
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'type': block.type,
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'id': block.id
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};
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if (addCoordinates) {
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saveCoords(block, state);
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}
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saveAttributes(block, state);
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saveExtraState(block, state);
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saveIcons(block, state);
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saveFields(block, state);
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if (addInputBlocks) {
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saveInputBlocks(block, state);
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}
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if (addNextBlocks) {
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saveNextBlocks(block, state);
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}
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return state;
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};
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exports.save = save;
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/**
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* Adds attributes to the given state object based on the state of the block.
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* Eg collapsed, disabled, inline, etc.
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* @param {!Block} block The block to base the attributes on.
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* @param {!State} state The state object to append to.
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*/
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const saveAttributes = function(block, state) {
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if (block.isCollapsed()) {
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state['collapsed'] = true;
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}
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if (!block.isEnabled()) {
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state['enabled'] = false;
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}
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if (block.inputsInline !== undefined &&
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block.inputsInline !== block.inputsInlineDefault) {
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state['inline'] = block.inputsInline;
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}
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// Data is a nullable string, so we don't need to worry about falsy values.
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if (block.data) {
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state['data'] = block.data;
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}
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};
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/**
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* Adds the coordinates of the given block to the given state object.
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* @param {!Block} block The block to base the coordinates on
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* @param {!State} state The state object to append to
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*/
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const saveCoords = function(block, state) {
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const workspace = block.workspace;
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const xy = block.getRelativeToSurfaceXY();
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state['x'] = Math.round(workspace.RTL ? workspace.getWidth() - xy.x : xy.x);
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state['y'] = Math.round(xy.y);
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};
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/**
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* Adds any extra state the block may provide to the given state object.
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* @param {!Block} block The block to serialize the extra state of.
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* @param {!State} state The state object to append to.
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*/
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const saveExtraState = function(block, state) {
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if (block.saveExtraState) {
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const extraState = block.saveExtraState();
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if (extraState !== null) {
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state['extraState'] = extraState;
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}
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} else if (block.mutationToDom) {
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const extraState = block.mutationToDom();
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if (extraState !== null) {
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state['extraState'] = Xml.domToText(extraState).replace(
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' xmlns="https://developers.google.com/blockly/xml"', '');
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}
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}
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};
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/**
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* Adds the state of all of the icons on the block to the given state object.
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* @param {!Block} block The block to serialize the icon state of.
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* @param {!State} state The state object to append to.
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*/
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const saveIcons = function(block, state) {
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// TODO(#2105): Remove this logic and put it in the icon.
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if (block.getCommentText()) {
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state['icons'] = {
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'comment': {
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'text': block.getCommentText(),
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'pinned': block.commentModel.pinned,
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'height': Math.round(block.commentModel.size.height),
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'width': Math.round(block.commentModel.size.width),
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}
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};
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}
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};
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/**
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* Adds the state of all of the fields on the block to the given state object.
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* @param {!Block} block The block to serialize the field state of.
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* @param {!State} state The state object to append to.
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*/
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const saveFields = function(block, state) {
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let hasFieldState = false;
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const fields = Object.create(null);
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for (let i = 0; i < block.inputList.length; i++) {
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const input = block.inputList[i];
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for (let j = 0; j < input.fieldRow.length; j++) {
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const field = input.fieldRow[j];
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if (field.isSerializable()) {
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hasFieldState = true;
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fields[field.name] = field.saveState();
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}
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}
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}
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if (hasFieldState) {
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state['fields'] = fields;
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}
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};
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/**
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* Adds the state of all of the child blocks of the given block (which are
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* connected to inputs) to the given state object.
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* @param {!Block} block The block to serialize the input blocks of.
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* @param {!State} state The state object to append to.
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*/
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const saveInputBlocks = function(block, state) {
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const inputs = Object.create(null);
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for (let i = 0; i < block.inputList.length; i++) {
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const input = block.inputList[i];
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if (input.type === inputTypes.DUMMY) {
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continue;
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}
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const connectionState =
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saveConnection(/** @type {!Connection} */ (input.connection));
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if (connectionState) {
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inputs[input.name] = connectionState;
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}
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}
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if (Object.keys(inputs).length) {
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state['inputs'] = inputs;
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}
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};
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/**
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* Adds the state of all of the next blocks of the given block to the given
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* state object.
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* @param {!Block} block The block to serialize the next blocks of.
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* @param {!State} state The state object to append to.
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*/
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const saveNextBlocks = function(block, state) {
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if (!block.nextConnection) {
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return;
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}
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const connectionState = saveConnection(block.nextConnection);
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if (connectionState) {
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state['next'] = connectionState;
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}
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};
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/**
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* Returns the state of the given connection (ie the state of any connected
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* shadow or real blocks).
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* @param {!Connection} connection The connection to serialize the connected
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* blocks of.
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* @return {?ConnectionState} An object containing the state of any connected
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* shadow block, or any connected real block.
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*/
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const saveConnection = function(connection) {
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const shadow = connection.getShadowState(true);
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const child = connection.targetBlock();
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if (!shadow && !child) {
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return null;
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}
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const state = Object.create(null);
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if (shadow) {
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state['shadow'] = shadow;
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}
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if (child && !child.isShadow()) {
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state['block'] = save(child);
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}
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return state;
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};
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/**
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* Loads the block represented by the given state into the given workspace.
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* @param {!State} state The state of a block to deserialize into the workspace.
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* @param {!Workspace} workspace The workspace to add the block to.
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* @param {{recordUndo: (boolean|undefined)}=} param1
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* recordUndo: If true, events triggered by this function will be undo-able
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* by the user. False by default.
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* @return {!Block} The block that was just loaded.
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*/
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const load = function(state, workspace, {recordUndo = false} = {}) {
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return loadInternal(state, workspace, {recordUndo});
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};
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exports.load = load;
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/**
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* Loads the block represented by the given state into the given workspace.
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* This is defined internally so that the extra parameters don't clutter our
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* external API.
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* But it is exported so that other places within Blockly can call it directly
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* with the extra paramters.
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* @param {!State} state The state of a block to deserialize into the workspace.
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* @param {!Workspace} workspace The workspace to add the block to.
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* @param {{parentConnection: (!Connection|undefined), isShadow:
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* (boolean|undefined), recordUndo: (boolean|undefined)}=} param1
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* parentConnection: If provided, the system will attempt to connect the
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* block to this connection after it is created. Undefined by default.
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* isShadow: The block will be set to a shadow block after it is created.
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* False by default.
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* recordUndo: If true, events triggered by this function will be undo-able
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* by the user. False by default.
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* @return {!Block} The block that was just loaded.
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*/
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const loadInternal = function(
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state,
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workspace,
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{
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parentConnection = undefined,
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isShadow = false,
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recordUndo = false
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} = {}
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) {
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const prevRecordUndo = Events.getRecordUndo();
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Events.setRecordUndo(recordUndo);
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const existingGroup = Events.getGroup();
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if (!existingGroup) {
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Events.setGroup(true);
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}
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Events.disable();
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const block = loadPrivate(state, workspace, {parentConnection, isShadow});
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Events.enable();
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Events.fire(new (Events.get(Events.BLOCK_CREATE))(block));
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Events.setGroup(existingGroup);
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Events.setRecordUndo(prevRecordUndo);
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// Adding connections to the connection db is expensive. This defers that
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// operation to decrease load time.
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if (workspace.rendered) {
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setTimeout(() => {
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if (!block.disposed) {
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block.setConnectionTracking(true);
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}
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}, 1);
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}
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return block;
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};
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/** @package */
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exports.loadInternal = loadInternal;
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/**
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* Loads the block represented by the given state into the given workspace.
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* This is defined privately so that it can be called recursively without firing
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* eroneous events. Events (and other things we only want to occur on the top
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* block) are handled by loadInternal.
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* @param {!State} state The state of a block to deserialize into the workspace.
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* @param {!Workspace} workspace The workspace to add the block to.
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* @param {{parentConnection: (!Connection|undefined), isShadow:
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* (boolean|undefined), recordUndo: (boolean|undefined)}=} param1
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* parentConnection: If provided, the system will attempt to connect the
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* block to this connection after it is created. Undefined by default.
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* isShadow: The block will be set to a shadow block after it is created.
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* False by default.
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* @return {!Block} The block that was just loaded.
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*/
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const loadPrivate = function(
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state,
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workspace,
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{
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parentConnection = undefined,
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isShadow = false,
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} = {}
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) {
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if (!state['type']) {
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throw new MissingBlockType(state);
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}
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const block = workspace.newBlock(state['type'], state['id']);
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block.setShadow(isShadow);
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loadCoords(block, state);
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loadAttributes(block, state);
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loadExtraState(block, state);
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tryToConnectParent(parentConnection, block, state);
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loadIcons(block, state);
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loadFields(block, state);
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loadInputBlocks(block, state);
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loadNextBlocks(block, state);
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initBlock(block, workspace.rendered);
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return block;
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};
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/**
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* Applies any coordinate information available on the state object to the
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* block.
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* @param {!Block} block The block to set the position of.
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* @param {!State} state The state object to reference.
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*/
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const loadCoords = function(block, state) {
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const x = state['x'] === undefined ? 10 : state['x'];
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const y = state['y'] === undefined ? 10 : state['y'];
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block.moveBy(x, y);
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};
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/**
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* Applies any attribute information available on the state object to the block.
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* @param {!Block} block The block to set the attributes of.
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* @param {!State} state The state object to reference.
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*/
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const loadAttributes = function(block, state) {
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if (state['collapsed']) {
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block.setCollapsed(true);
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}
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if (state['enabled'] === false) {
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block.setEnabled(false);
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}
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if (state['inline'] !== undefined) {
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block.setInputsInline(state['inline']);
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}
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if (state['data'] !== undefined) {
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block.data = state['data'];
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}
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};
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/**
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* Applies any extra state information available on the state object to the
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* block.
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* @param {!Block} block The block to set the extra state of.
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* @param {!State} state The state object to reference.
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*/
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const loadExtraState = function(block, state) {
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if (!state['extraState']) {
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return;
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}
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if (block.loadExtraState) {
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block.loadExtraState(state['extraState']);
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} else {
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block.domToMutation(Xml.textToDom(state['extraState']));
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}
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};
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/**
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* Attempts to connect the block to the parent connection, if it exists.
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* @param {(!Connection|undefined)} parentConnection The parent connnection to
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* try to connect the block to.
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* @param {!Block} child The block to try to conecnt to the parent.
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* @param {!State} state The state which defines the given block
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*/
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const tryToConnectParent = function(parentConnection, child, state) {
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if (!parentConnection) {
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return;
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}
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if (parentConnection.getSourceBlock().isShadow() && !child.isShadow()) {
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throw new RealChildOfShadow(state);
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}
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let connected = false;
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let childConnection;
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if (parentConnection.type == inputTypes.VALUE) {
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childConnection = child.outputConnection;
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if (!childConnection) {
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throw new MissingConnection('output', child, state);
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}
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connected = parentConnection.connect(childConnection);
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} else { // Statement type.
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childConnection = child.previousConnection;
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if (!childConnection) {
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throw new MissingConnection('previous', child, state);
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}
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connected = parentConnection.connect(childConnection);
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}
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if (!connected) {
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const checker = child.workspace.connectionChecker;
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throw new BadConnectionCheck(
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checker.getErrorMessage(
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checker.canConnectWithReason(
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childConnection, parentConnection, false),
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childConnection,
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parentConnection),
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parentConnection.type == inputTypes.VALUE ?
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'output connection' : 'previous connection',
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child,
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state);
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}
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};
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/**
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* Applies icon state to the icons on the block, based on the given state
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* object.
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* @param {!Block} block The block to set the icon state of.
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* @param {!State} state The state object to reference.
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*/
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const loadIcons = function(block, state) {
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if (!state['icons']) {
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return;
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}
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// TODO(#2105): Remove this logic and put it in the icon.
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const comment = state['icons']['comment'];
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if (comment) {
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block.setCommentText(comment['text']);
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block.commentModel.pinned = comment['pinned'];
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block.commentModel.size = new Size(comment['width'], comment['height']);
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if (comment['pinned'] && block.getCommentIcon && !block.isInFlyout) {
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// Give the block a chance to be positioned and rendered before showing.
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setTimeout(() => block.getCommentIcon().setVisible(true), 1);
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}
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}
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};
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/**
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* Applies any field information available on the state object to the block.
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* @param {!Block} block The block to set the field state of.
|
|
* @param {!State} state The state object to reference.
|
|
*/
|
|
const loadFields = function(block, state) {
|
|
if (!state['fields']) {
|
|
return;
|
|
}
|
|
const keys = Object.keys(state['fields']);
|
|
for (let i = 0; i < keys.length; i++) {
|
|
const fieldName = keys[i];
|
|
const fieldState = state['fields'][fieldName];
|
|
const field = block.getField(fieldName);
|
|
if (!field) {
|
|
console.warn(
|
|
`Ignoring non-existant field ${fieldName} in block ${block.type}`);
|
|
continue;
|
|
}
|
|
field.loadState(fieldState);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Creates any child blocks (attached to inputs) defined by the given state
|
|
* and attaches them to the given block.
|
|
* @param {!Block} block The block to attach input blocks to.
|
|
* @param {!State} state The state object to reference.
|
|
*/
|
|
const loadInputBlocks = function(block, state) {
|
|
if (!state['inputs']) {
|
|
return;
|
|
}
|
|
const keys = Object.keys(state['inputs']);
|
|
for (let i = 0; i < keys.length; i++) {
|
|
const inputName = keys[i];
|
|
const input = block.getInput(inputName);
|
|
if (!input || !input.connection) {
|
|
throw new MissingConnection(inputName, block, state);
|
|
}
|
|
loadConnection(input.connection, state['inputs'][inputName]);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Creates any next blocks defined by the given state and attaches them to the
|
|
* given block.
|
|
* @param {!Block} block The block to attach next blocks to.
|
|
* @param {!State} state The state object to reference.
|
|
*/
|
|
const loadNextBlocks = function(block, state) {
|
|
if (!state['next']) {
|
|
return;
|
|
}
|
|
if (!block.nextConnection) {
|
|
throw new MissingConnection('next', block, state);
|
|
}
|
|
loadConnection(block.nextConnection, state['next']);
|
|
};
|
|
|
|
/**
|
|
* Applies the state defined by connectionState to the given connection, ie
|
|
* assigns shadows and attaches child blocks.
|
|
* @param {!Connection} connection The connection to serialize the
|
|
* connected blocks of.
|
|
* @param {!ConnectionState} connectionState The object containing the state of
|
|
* any connected shadow block, or any connected real block.
|
|
*/
|
|
const loadConnection = function(connection, connectionState) {
|
|
if (connectionState['shadow']) {
|
|
connection.setShadowState(connectionState['shadow']);
|
|
}
|
|
if (connectionState['block']) {
|
|
loadPrivate(
|
|
connectionState['block'],
|
|
connection.getSourceBlock().workspace,
|
|
{parentConnection: connection});
|
|
}
|
|
};
|
|
|
|
// TODO(#5146): Remove this from the serialization system.
|
|
/**
|
|
* Initializes the give block, eg init the model, inits the svg, renders, etc.
|
|
* @param {!Block} block The block to initialize.
|
|
* @param {boolean} rendered Whether the block is a rendered or headless block.
|
|
*/
|
|
const initBlock = function(block, rendered) {
|
|
if (rendered) {
|
|
// Adding connections to the connection db is expensive. This defers that
|
|
// operation to decrease load time.
|
|
block.setConnectionTracking(false);
|
|
|
|
block.initSvg();
|
|
block.render(false);
|
|
} else {
|
|
block.initModel();
|
|
}
|
|
};
|
|
|
|
// Aliases to disambiguate saving/loading within the serializer.
|
|
const saveBlock = save;
|
|
const loadBlock = load;
|
|
|
|
/**
|
|
* Serializer for saving and loading block state.
|
|
* @implements {ISerializer}
|
|
*/
|
|
class BlockSerializer {
|
|
constructor() {
|
|
/**
|
|
* The priority for deserializing blocks.
|
|
* @type {number}
|
|
*/
|
|
this.priority = priorities.BLOCKS;
|
|
}
|
|
|
|
/**
|
|
* Serializes the blocks of the given workspace.
|
|
* @param {!Workspace} workspace The workspace to save the blocks of.
|
|
* @return {?{languageVersion: number, blocks:!Array<!State>}} The state of
|
|
* the workspace's blocks, or null if there are no blocks.
|
|
*/
|
|
save(workspace) {
|
|
const blockState = [];
|
|
for (const block of workspace.getTopBlocks(false)) {
|
|
const state = saveBlock(block, {addCoordinates: true});
|
|
if (state) {
|
|
blockState.push(state);
|
|
}
|
|
}
|
|
if (blockState.length) {
|
|
return {
|
|
'languageVersion': 0, // Currently unused.
|
|
'blocks': blockState
|
|
};
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Deserializes the blocks defined by the given state into the given
|
|
* workspace.
|
|
* @param {{languageVersion: number, blocks:!Array<!State>}} state The state
|
|
* of the blocks to deserialize.
|
|
* @param {!Workspace} workspace The workspace to deserialize into.
|
|
*/
|
|
load(state, workspace) {
|
|
const blockStates = state['blocks'];
|
|
for (const state of blockStates) {
|
|
loadBlock(state, workspace, {recordUndo: Events.getRecordUndo()});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Disposes of any blocks that exist on the workspace.
|
|
* @param {!Workspace} workspace The workspace to clear the blocks of.
|
|
*/
|
|
clear(workspace) {
|
|
// Cannot use workspace.clear() because that also removes variables.
|
|
for (const block of workspace.getTopBlocks(false)) {
|
|
block.dispose(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
serializationRegistry.register('blocks', new BlockSerializer());
|