chainscript/lib/utils/readFromPDF.js

Client for chainscript.io

'use strict';

exports.__esModule = true;
exports['default'] = readFromPDF;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _fs = require('fs');

var _fs2 = _interopRequireDefault(_fs);

function readFromPDF(input) {
  return new Promise(function (resolve, reject) {
    var reader = typeof input === 'string' ? _fs2['default'].createReadStream(input) : input;

    var buffer = new Buffer([]);

    reader.on('error', reject);

    reader.on('data', function (data) {
      return buffer = Buffer.concat([buffer, data]);
    });

    reader.on('end', function () {
      var start = buffer.indexOf('\n% Chainscript: ');

      if (start < 0) {
        resolve(null);
      }

      start += 16;
      var end = buffer.indexOf('\n', start);
      var str = buffer.slice(start, end).toString();

      try {
        resolve(JSON.parse(str));
      } catch (err) {
        reject(err);
      }
    });
  });
}

module.exports = exports['default'];