275 lines
12 KiB
TypeScript
275 lines
12 KiB
TypeScript
import assert from 'assert';
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import { getAttrRefInExpression, StorageSchema } from '../types';
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import { EXPRESSION_PREFIX } from '../types/Demand';
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import { EntityDict } from '../types/Entity';
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import { getRelevantIds } from './filter';
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import { judgeRelation } from './relation';
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type SelectionRewriter<ED extends EntityDict> = (schema: StorageSchema<ED>, entity: keyof ED, selection: ED[keyof ED]['Selection']) => void;
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const SelectionRewriters: SelectionRewriter<any>[] = [];
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export function registerSelectionRewriter<ED extends EntityDict>(rewriter: SelectionRewriter<ED>) {
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SelectionRewriters.push(rewriter);
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}
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function getSelectionRewriters<ED extends EntityDict>() {
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return SelectionRewriters as SelectionRewriter<ED>[];
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}
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type OperationRewriter<ED extends EntityDict> = (schema: StorageSchema<ED>, entity: keyof ED, operate: ED[keyof ED]['Operation']) => void;
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const OperationRewriters: OperationRewriter<any>[] = [];
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export function registerOperationRewriter<ED extends EntityDict>(rewriter: OperationRewriter<ED>) {
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OperationRewriters.push(rewriter);
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}
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function getOperationRewriters<ED extends EntityDict>() {
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return OperationRewriters as OperationRewriter<ED>[];
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}
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/**
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* 对selection进行一些完善，避免编程人员的疏漏
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* @param selection
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*/
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export function reinforceSelection<ED extends EntityDict>(schema: StorageSchema<ED>, entity: keyof ED, selection: ED[keyof ED]['Selection']) {
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const { filter, data, sorter } = selection;
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const checkNode = (projectionNode: ED[keyof ED]['Selection']['data'], attrs: string[]) => {
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attrs.forEach(
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(attr) => {
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if (!projectionNode.hasOwnProperty(attr)) {
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Object.assign(projectionNode, {
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[attr]: 1,
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});
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}
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}
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);
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};
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let relevantIds: string[] = [];
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if (filter) {
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const toBeAssignNode: Record<string, string[]> = {}; // 用来记录在表达式中涉及到的结点
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// filter当中所关联到的属性必须在projection中
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const filterNodeDict: Record<string, ED[keyof ED]['Selection']['data']> = {};
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const checkFilterNode = (entity2: keyof ED, filterNode: ED[keyof ED]['Selection']['filter'], projectionNode: ED[keyof ED]['Selection']['data']) => {
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const necessaryAttrs: string[] = ['id'];
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for (const attr in filterNode) {
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if (attr === '#id') {
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assert(!filterNodeDict[filterNode[attr]!], `projection中结点的id有重复, ${filterNode[attr]}`);
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Object.assign(filterNodeDict, {
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[filterNode[attr]!]: projectionNode,
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});
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if (toBeAssignNode[filterNode[attr]!]) {
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checkNode(projectionNode, toBeAssignNode[filterNode[attr]!]);
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}
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}
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else if (['$and', '$or'].includes(attr)) {
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for (const node of filterNode[attr]!) {
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checkFilterNode(entity2, node, projectionNode);
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}
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}
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else if (attr === '$not') {
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checkFilterNode(entity2, filterNode[attr]!, projectionNode);
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}
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else if (attr === '$text') {
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// 全文检索首先要有fulltext索引，其次要把fulltext的相关属性加到projection里
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const { indexes } = schema[entity2];
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const fulltextIndex = indexes!.find(
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ele => ele.config && ele.config.type === 'fulltext'
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);
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const { attributes } = fulltextIndex!;
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necessaryAttrs.push(...(attributes.map(ele => ele.name as string)));
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}
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else {
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if (attr.toLowerCase().startsWith(EXPRESSION_PREFIX)) {
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const exprResult = getAttrRefInExpression(filterNode[attr]!);
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for (const nodeName in exprResult) {
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if (nodeName === '#current') {
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checkNode(projectionNode, exprResult[nodeName]);
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}
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else if (filterNodeDict[nodeName]) {
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checkNode(filterNodeDict[nodeName], exprResult[nodeName]);
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}
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else {
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if (toBeAssignNode[nodeName]) {
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toBeAssignNode[nodeName].push(...exprResult[nodeName]);
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}
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else {
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Object.assign(toBeAssignNode, {
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[nodeName]: exprResult[nodeName],
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});
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}
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}
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}
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}
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else {
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const rel = judgeRelation(schema, entity2, attr);
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if (rel === 1) {
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necessaryAttrs.push(attr);
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}
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else if (rel === 2) {
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// entity/entityId反指
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necessaryAttrs.push('entity', 'entityId');
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if (!projectionNode[attr]) {
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Object.assign(projectionNode, {
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[attr]: {
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id: 1,
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}
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});
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}
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checkFilterNode(attr, filterNode[attr]!, projectionNode[attr]);
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}
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else if (typeof rel === 'string') {
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necessaryAttrs.push(`${attr}Id`);
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if (!projectionNode[attr]) {
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Object.assign(projectionNode, {
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[attr]: {
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id: 1,
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}
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});
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}
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checkFilterNode(rel, filterNode[attr]!, projectionNode[attr]);
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}
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else if (rel instanceof Array) {
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// 现在filter中还不支持一对多的语义，先放着吧
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}
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}
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}
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checkNode(projectionNode, necessaryAttrs);
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}
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};
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checkFilterNode(entity, filter, data);
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relevantIds = getRelevantIds(filter);
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}
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// sorter感觉现在取不取影响不大，前端的list直接获取返回的ids了，先不管之
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if (sorter) {
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}
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const toBeAssignNode2: Record<string, string[]> = {}; // 用来记录在表达式中涉及到的结点
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const projectionNodeDict: Record<string, ED[keyof ED]['Selection']['data']> = {};
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const checkProjectionNode = (entity2: keyof ED, projectionNode: ED[keyof ED]['Selection']['data']) => {
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const necessaryAttrs: string[] = ['id', '$$createAt$$']; // 有的页面依赖于其它页面取数据，有时两个页面的filter的差异会导致有一个加createAt，有一个不加，此时可能产生前台取数据不完整的异常。先统一加上
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for (const attr in projectionNode) {
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if (attr === '#id') {
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assert(!projectionNodeDict[projectionNode[attr]!], `projection中结点的id有重复, ${projectionNode[attr]}`);
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Object.assign(projectionNodeDict, {
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[projectionNode[attr]!]: projectionNode,
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});
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if (toBeAssignNode2[projectionNode[attr]!]) {
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checkNode(projectionNode, toBeAssignNode2[projectionNode[attr]!]);
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}
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}
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else {
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if (attr.toLowerCase().startsWith(EXPRESSION_PREFIX)) {
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const exprResult = getAttrRefInExpression(projectionNode[attr]!);
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for (const nodeName in exprResult) {
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if (nodeName === '#current') {
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checkNode(projectionNode, exprResult[nodeName]);
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}
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else if (projectionNodeDict[nodeName]) {
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checkNode(projectionNodeDict[nodeName], exprResult[nodeName]);
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}
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else {
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if (toBeAssignNode2[nodeName]) {
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toBeAssignNode2[nodeName].push(...exprResult[nodeName]);
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}
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else {
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Object.assign(toBeAssignNode2, {
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[nodeName]: exprResult[nodeName],
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});
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}
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}
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}
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}
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else {
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const rel = judgeRelation(schema, entity2, attr);
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if (rel === 1) {
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necessaryAttrs.push(attr);
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}
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else if (rel === 2) {
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// entity/entityId反指
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necessaryAttrs.push('entity', 'entityId');
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checkProjectionNode(attr, projectionNode[attr]);
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}
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else if (typeof rel === 'string') {
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necessaryAttrs.push(`${attr}Id`);
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checkProjectionNode(rel, projectionNode[attr]);
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}
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else if (rel instanceof Array && !attr.endsWith('$$aggr')) {
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const { data } = projectionNode[attr];
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if (rel[1]) {
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checkNode(data, [rel[1]]);
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}
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else {
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checkNode(data, ['entity', 'entityId']);
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}
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reinforceSelection(schema, rel[0], projectionNode[attr]);
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}
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}
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}
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checkNode(projectionNode, necessaryAttrs);
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}
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// 如果对象中指向一对多的Modi，此时加上指向Modi的projection
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if (schema[entity2].toModi) {
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Object.assign(projectionNode, {
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modi$entity: {
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$entity: 'modi',
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data: {
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id: 1,
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targetEntity: 1,
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entity: 1,
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entityId: 1,
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action: 1,
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iState: 1,
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data: 1,
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filter: 1,
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},
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filter: {
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iState: 'active',
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},
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}
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});
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}
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};
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checkProjectionNode(entity, data);
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if (!sorter && relevantIds.length === 0) {
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// 如果没有sorter，就给予一个按createAt逆序的sorter
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Object.assign(selection, {
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sorter: [
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{
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$attr: {
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$$createAt$$: 1,
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},
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$direction: 'desc',
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}
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]
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});
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Object.assign(data, {
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$$createAt$$: 1,
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});
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}
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SelectionRewriters.forEach(
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ele => ele(schema, entity, selection)
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);
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}
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/**
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* 对operation进行一些完善，作为operation算子的注入点
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* @param schema
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* @param entity
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* @param selection
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*/
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export function reinforceOperation<ED extends EntityDict>(schema: StorageSchema<ED>, entity: keyof ED, operation: ED[keyof ED]['Operation']) {
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OperationRewriters.forEach(
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ele => ele(schema, entity, operation)
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);
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} |