zentiment.js

var AWS = require('aws-sdk')
function Zentiment(config){
  this.results = {};
  this.region = config.region?config.region:'';
  this.accessKeyId = config.accessKeyId?config.accessKeyId:'';
  this.secretAccessKey = config.secretAccessKey?config.secretAccessKey:'';
  this.text = '';
  this.textParts = [];
  this.comprehend = null;
}
Zentiment.prototype.init = function(){
  let z = this;
  this.comprehend = new AWS.Comprehend({
    region:z.region,
    accessKeyId:z.accessKeyId,
    secretAccessKey:z.secretAccessKey
  });
};

Zentiment.prototype.detectSentiment = function(str,cb){
  let z = this;
  z.text = String(str);
  z.textParts = z.text.match( /[^\.!\?]+[\.!\?]+/g );
  let LangInfo = {
    'LanguageCode':'',
    'Score':0
  };
  let params = {
    TextList: [
      z.text,
    ]
  };
  z.comprehend.batchDetectDominantLanguage(params, function(err, data) {
    if (err) console.log(err, err.stack); // an error occurred

    data.ResultList[0].Languages.forEach(function(langobj){
      if(langobj.Score > LangInfo.Score){
        LangInfo.Score = langobj.Score;
        LangInfo.LanguageCode = langobj.LanguageCode;
      }
    });
    console.log('LangInfo',LangInfo);
    params.TextList = [z.text];
    params.LanguageCode = LangInfo.LanguageCode;
    z.comprehend.batchDetectSentiment(params, function(err, data) {
      if (err) console.log(err, err.stack); // an error occurred
      else     console.log(data.ResultList);           // successful response
      if(cb){//callback?
        cb(data);
      }
    });
  });

};
exports.z = Zentiment;


/*
var Zentiment = require('./zentiment').z;
let z = new Zentiment({
  region:'',
  accessKeyId:'',
  secretAccessKey:''
});
let cb = function(data){
  console.log('callback');
  console.log(data.ResultList);
};
var letter = 'Hungry hungry hippo.';
z.init();
z.detectSentiment(letter,cb);
*/