amis/src/utils/tpl.ts

一种MIS页面生成工具

export interface Enginer {
    test: (tpl: string) => boolean;
    compile: (tpl: string, data: object, ...rest: Array<any>) => string;
}

const enginers: {
    [propName: string]: Enginer;
} = {};

export function reigsterTplEnginer(name: string, enginer: Enginer) {
    enginers[name] = enginer;
}

export function filter(tpl: string, data: object = {}, ...rest: Array<any>): string {
    if (!tpl || typeof tpl !== 'string') {
        return '';
    }

    let keys = Object.keys(enginers);
    for (let i = 0, len = keys.length; i < len; i++) {
        let enginer = enginers[keys[i]];
        if (enginer.test(tpl)) {
            return enginer.compile(tpl, data, ...rest);
        }
    }

    return tpl;
}

export function evalExpression(expression: string, data?: object): boolean {
    if (!expression || typeof expression !== 'string') {
        return false;
    }

    /* jshint evil:true */
    try {
        let debug = false;
        const idx = expression.indexOf('debugger');
        if (~idx) {
            debug = true;
            expression = expression.replace(/debugger;?/, '');
        }

        const fn = new Function('data', `with(data) {${debug ? 'debugger;' : ''}return !!(${expression});}`);
        data = data || {};
        return fn.call(data, data);
    } catch (e) {
        console.warn(e);
        return false;
    }
}

export function evalJS(js: string, data: object): any {
    /* jshint evil:true */
    try {
        const fn = new Function('data', `with(data) {${~js.indexOf('return') ? '' : 'return '}${js};}`);
        data = data || {};
        return fn.call(data, data);
    } catch (e) {
        console.warn(e);
        return null;
    }
}