node-wolfram/dist/index.js

Extremely minimal WolframAlpha API wrapper for Node.js.

(function() {
  var Client, request, url, xml2js;

  request = require('request');

  xml2js = require('xml2js');

  url = require('url');

  Client = (function() {
    function Client(appId) {
      this.appId = appId;
      this.baseURL = url.parse("http://api.wolframalpha.com/v2/query");
    }

    Client.prototype.makeQueryURL = function(query) {
      var key, value;
      this.baseURL.query = {
        appid: this.appId
      };
      if (query instanceof Object) {
        for (key in query) {
          value = query[key];
          this.baseURL.query[key] = value;
        }
      } else {
        this.baseURL.query.input = query;
      }
      return url.format(this.baseURL);
    };

    Client.prototype.query = function(query, callback) {
      var queryURL;
      if (this.appId == null) {
        throw new Error("Cannot query without appId.");
      }
      queryURL = this.makeQueryURL(query);
      return request(queryURL, function(err, response, body) {
        if ((err != null) || response.statusCode !== 200) {
          return callback(err, null);
        }
        return xml2js.parseString(body, function(err, result) {
          if (err != null) {
            return callback(err, result);
          } else if (result.queryresult.$.error) {
            return callback(result.queryresult.error, result);
          } else {
            return callback(null, result);
          }
        });
      });
    };

    return Client;

  })();

  module.exports = Client;

}).call(this);