text: /*
   This file is part of web3.js.
  
   web3.js is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
  
   web3.js is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.
  
   You should have received a copy of the GNU Lesser General Public License
   along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
   */
  /**
   * @file givenProvider.js
   * @author Fabian Vogelsteller <fabian@ethereum.org>
   * @date 2017
   */
  
  "use strict";
  
  var givenProvider = null;
  
  // ADD GIVEN PROVIDER
  /* jshint ignore:start */
  var global;
  try {
    global = Function('return this')();
  } catch (e) {
    global = window;
  }
  
  // EIP-1193: window.ethereum
  if (typeof global.ethereum !== 'undefined') {
      givenProvider = global.ethereum;
  
  // Legacy web3.currentProvider
  } else if(typeof global.web3 !== 'undefined' && global.web3.currentProvider) {
  
      if(global.web3.currentProvider.sendAsync) {
          global.web3.currentProvider.send = global.web3.currentProvider.sendAsync;
          delete global.web3.currentProvider.sendAsync;
      }
  
      // if connection is 'ipcProviderWrapper', add subscription support
      if(!global.web3.currentProvider.on &&
          global.web3.currentProvider.connection &&
          global.web3.currentProvider.connection.constructor.name === 'ipcProviderWrapper') {
  
          global.web3.currentProvider.on = function (type, callback) {
  
              if(typeof callback !== 'function')
                  throw new Error('The second parameter callback must be a function.');
  
              switch(type){
                  case 'data':
                      this.connection.on('data', function(data) {
                          var result = '';
  
                          data = data.toString();
  
                          try {
                              result = JSON.parse(data);
                          } catch(e) {
                              return callback(new Error('Couldn\'t parse response data'+ data));
                          }
  
                          // notification
                          if(!result.id && result.method.indexOf('_subscription') !== -1) {
                              callback(null, result);
                          }
  
                      });
                      break;
  
                  default:
                      this.connection.on(type, callback);
                      break;
              }
          };
      }
  
      givenProvider = global.web3.currentProvider;
  }
  /* jshint ignore:end */
  
  
  module.exports = givenProvider;
  