src/plugins/ImportPlugin.js

/**
 * @file 导入插件
 * @author exodia(d_xinxin@163.com)
 */

import BasePlugin from './BasePlugin';
import u from '../util';

const ANONY_PREFIX = '^uioc-';
const CACHE = Symbol('cache');

/**
 * @private
 */
export default class ImportPlugin extends BasePlugin {

    static has(obj) {
        return u.isObject(obj) && typeof obj.$import === 'string';
    }

    static transformConfig(ioc, config) {
        // 解析构造函数参数
        let argConfigs = config.args;
        let id = null;
        let deps = argConfigs.reduce(
            (result, argConfig, index) => {
                if (ImportPlugin.has(argConfig)) {
                    // 给匿名组件配置生成一个 ioc 构件id
                    id = ImportPlugin.createAnonymousConfig(ioc, argConfig, `${config.id}-$arg.${index}.`);
                    argConfigs[index] = {$ref: id};
                    result.push(id);
                }
                return result;
            },
            []
        );

        // 解析属性
        let props = config.properties;
        for (let k in props) {
            if (ImportPlugin.has(props[k])) {
                id = ImportPlugin.createAnonymousConfig(ioc, props[k], `${config.id}-$prop.${k}.`);
                props[k] = {$ref: id};
                deps.push(id);
            }
        }

        return deps
    }

    static createAnonymousConfig(ioc, config = {}, idPrefix) {
        let importId = config.$import;
        if (!ioc.hasComponent(importId)) {
            throw new Error(`$import ${importId} component, but it is not exist, please check!!`);
        }

        let refConfig = ioc.getComponentConfig(importId);
        config.id = (idPrefix.indexOf(ANONY_PREFIX) !== -1 ? '' : ANONY_PREFIX) + idPrefix;
        config.$import = undefined;
        ioc.addComponent(config.id, {...refConfig, ...config});

        return config.id;
    }

    get name() {
        return 'import';
    }

    constructor() {
        super();
        this[CACHE] = Object.create(null);
    }

    /**
     * @override
     */
    onGetComponent(ioc, id, config) {
        if (this[CACHE][id]) {
            return config;
        }

        this[CACHE][id] = ImportPlugin.transformConfig(ioc, config);

        return config;
    }
}