merge合并2个json文件

功能

import { expect } from "chai";
import { createMerge } from "./merge";
import { equals } from "ramda";
// 定义合并数组时，判断数组项目是否合并
const merge = createMerge((a, b) => {return equals(a, b);
});
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import { uniq, keys, dissoc } from "ramda";
import {getType,isNullOrUndefined,isObject,isArray,isString
} from "../util";
export function createMerge(isSame: (a, b) => boolean) {return function merge<T = any>(...sources: T[]) {if (sources.length === 1) {return sources[0];}return sources.reduce((acc, curr) => mergeHelper(acc, curr, isSame), {});};
}function mergeHelper(a, b, isSame) {if (a === b) {return b;}const typeA = getType(a);switch (typeA) {case "array":return mergeArray(a, b, isSame);case "object":return mergeObject(a, b, isSame);case "undefined":return b;case "null":return b;default:if (a === b) {return b;}return mergeDefault(a, b, isSame);}
}
function mergeArray(a: any[], b: any, isSame) {const bType = getType(b);switch (bType) {case "array":// 对比a和b的每一个项目，查看项目的键值是否有相等的const rowLength = a.length;const colLength = b.length;for (let i = 0; i < rowLength; i++) {for (let j = 0; j < colLength; j++) {const equalKeys = getEqualKey(a[i], b[j], isSame);const itema = a[i];const itemb = b[j];if (isString(itema) && isString(itemb)) {if (itema === itemb) {} else if (itema.startsWith(itemb)) {a[i] = itema;delete b[j];break;} else if (itemb.startsWith(itema)) {a[i] = itemb;delete b[j];break;}}if (equalKeys.length > 0) {const result = mergeHelper(itema, itemb, isSame);a[i] = result;delete b[j];break;}}}a = a.filter(res => check(res));b = b.filter(res => check(res));return uniq(a.concat(b));case "null":case "undefined":return a;default:return [...a, b];}
}
function mergeObject(a: object, b: any, isSame) {const bType = getType(b);switch (bType) {case "array":return uniq([a, ...b]);case "object":let result = {};const allKeys = uniq(keys(a).concat(keys(b as object)));if (allKeys.length > 0) {for (let i = 0; i < allKeys.length; i++) {const key: string = allKeys[i];const _keys = key + "s";// a[key] b[keys] `${key}s`if (a[key] && b[_keys]) {a[_keys] = [a[key]];a = dissoc(key, a);}if (b[key] && a[_keys]) {a = dissoc(_keys, a);result = dissoc(_keys, a);}const source = a[key];const target = b[key];if (!isNullOrUndefined(source) || !isNullOrUndefined(target)) {const res = mergeHelper(source, target, isSame);result[key] = res;}}}return result;default:return b;}
}function check(a) {if (isNullOrUndefined(a)) return false;if (isObject(a) || isArray(a)) {return keys(a).length > 0;}return true;
}
function getEqualKey(a, b, isSame): any[] {try {const key = uniq(keys(a).concat(keys(b)));return key.filter(key => {try {const res = isSame([key, toString(a[key])], [key, toString(b[key])]);return res;} catch (e) {return false;}});} catch (e) {return [];}
}function toString(a) {const t = getType(a);switch (t) {case "null":case "undefined":return false;case "string":return a;case "number":return `${a}`;case "boolean":return `${a}`;case "object":return keys(a).map(key => `${key as string}:${toString(a[key])}`).join("\n");default:return a.toString();}
}function mergeDefault(a: string | number | RegExp | boolean, b: any, isSame) {const bType = getType(b);switch (bType) {case "array":return uniq([a, ...b]);case "null":case "undefined":return a;case "string":if ((b as string).startsWith(a as string)) {return b;}if ((a as string).startsWith(b as string)) {return a;}return b;default:return b;}
}
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