map-resolver

Let you pass a map and return a resolver to resolve for value later

Installation

$ npm install map-resolver

API

const mapResolver = require('map-resolver');
const map = {
    '@': () => req.body,
    ':': () => req.params,
    '?': () => req.query,
    '*': () => process.env,
    '#': () => req.cookies
};
const resolve = mapResolver(map);
const id = resolve('@', 'id');    //  id = req.body.id
const name = resolve(':0');    //  id = req.params[0]
const sid = resolve('?session.id');    //  sid = req.query.session.id

mapResolver(map)

• map must be an filled object
• key should be a string, used as a flag, tells resolver which function to call
• value must be a function that returns an object, array or undefined
• return resolver: (string[, string]) => any A function you call to resolve with flag and id for value.

resolver(flag[, id][, useDotNotation = true])

• flag must be a string and matches flags in the map
• id is an optional string tells resolver what to resolve
• useDotNotation is an optional boolean indicates if id should be treat as dot notation

Example

const mapResolver = require('map-resolver');

var req = {};
const constants = {
    'maxThread': 3
};

const map = {
    '...': () => req.body,
    ':': () => req.params,
    '?': () => req.query,
    '*': () => process.env,
    '#': () => req.cookies,
    '定': () => constants,
};

const resolve = mapResolver(map);


req = {
    body: {
        'app.name': 'MP'
    },
    params: ['express', 'middleware'],
    query: {
        session: {
            id: '123'
        }
    }
};

process.env.YEAR = '2017';

console.log(resolve('...app.name', null, false));   //  'MP'
console.log(resolve(':1'));                         //  middleware
console.log(resolve('?session.id', null, true));    //  '123'
console.log(resolve('*', 'YEAR'));                  //  '2017'
console.log(resolve('#', 'id'));                    //  undefined;
console.log(resolve('定maxThread'));                //  3

MIT Licensed