RNMEvaluator.js

/**
 *
 * @providesModule RNMEvaluator
 * @flow
 */
'use strict';

var {
    DeviceEventEmitter,
    NativeModules: {
        RNMEvaluator
    }
} = require('react-native');

var execute = (data, executor) => {
    var {name, args, callId} = data,
        cb = res => {
            if (res instanceof Promise) {
                res.then(result => RNMEvaluator.functionCallCompleted(callId, null, {_value: result}));
                return;
            }
            if (res instanceof Error) {
                RNMEvaluator.functionCallCompleted(callId, `Function ${name} raised an error ${res.message}:${res.stack}`, null);
            } else {
                RNMEvaluator.functionCallCompleted(callId, null, {_value: res});
            }
        }, func, err;

    try {
        func = eval(name);
    } catch (e) {
        err = e;
    }

    if (err) {
        return RNMEvaluator.functionCallCompleted(callId, `Error finding a function ${err.message}`, null);
    }

    if (!func) {
        return RNMEvaluator.functionCallCompleted(callId, `Function ${name} cannot be found`, null);
    }

    if (typeof func !== 'function') {
        return RNMEvaluator.functionCallCompleted(callId, `${name} is not a function`, null);
    }

    try {
        executor(func).apply(null, args.concat(cb))
    } catch (e) {
        RNMEvaluator.functionCallCompleted(callId, `Function ${name} raised an error ${e.message}:${e.stack}`, null);
    }
}

// TODO: move to AppEventEmitter once App events are supported on android.
DeviceEventEmitter.addListener('RNMEvaluator.callAsyncFunction',
    data => execute(data, f => f));

DeviceEventEmitter.addListener('RNMEvaluator.callSyncFunction',
    data => execute(data, f => (...args) => args.pop()(f.apply(null, args))));

exports.emit = (name, res) => {
    RNMEvaluator.emit(name, {_value: res});
};