penteract/lib/index.js

The native Node.js bindings to the Tesseract OCR project.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.recognize = exports.fromFile = undefined;

var _promise = require('babel-runtime/core-js/promise');

var _promise2 = _interopRequireDefault(_promise);

var _penteract = require('../build/Release/penteract');

var _penteract2 = _interopRequireDefault(_penteract);

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

const DEFAULT_LANG = 'eng';
const LANG_DELIMITER = '+';

const handleOptions = ({
  lang = DEFAULT_LANG
} = {}) => {

  if (Array.isArray(lang)) {
    lang = lang.join(LANG_DELIMITER);
  }

  return {
    lang
  };
};

const makePromise = method => {
  return (arg, options) => new _promise2.default((resolve, reject) => {
    options = handleOptions(options);

    _penteract2.default[method](arg, options.lang, (err, text) => {
      if (err) {
        const error = new Error(text);
        error.code = err;
        return reject(error);
      }

      resolve(text.trim());
    });
  });
};

const fromFile = exports.fromFile = makePromise('fromFile');
const recognize = exports.recognize = makePromise('recognize');