Code coverage report for imgly-sdk-html5/src/js/lib/image-dimensions.js

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/*
 * Photo Editor SDK - photoeditorsdk.com
 * Copyright (c) 2013-2015 9elements GmbH
 *
 * Released under Attribution-NonCommercial 3.0 Unported
 * http://creativecommons.org/licenses/by-nc/3.0/
 *
 * For commercial use, please contact us at contact@9elements.com
 */
 
/**
 * Parses the dimensions string and provides calculation functions
 * @class
 * @alias ImglyKit.ImageDimensions
 * @param {string} dimensions
 * @private
 */
'use strict';
 
Object.defineProperty(exports, '__esModule', {
  value: true
});
// istanbul ignore next
 
var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; Eif ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { Eif (protoProps) defineProperties(Constructor.prototype, protoProps); Iif (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
 
// istanbul ignore next
 
function _classCallCheck(instance, Constructor) { Iif (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
 
var ImageDimensions = (function () {
  function ImageDimensions(dimensions) {
    _classCallCheck(this, ImageDimensions);
 
    /**
     * The available dimension modifiers
     * @type {Object}
     * @private
     */
    this._modifiers = {
      FIXED: '!'
    };
 
    /**
     * @type {string}
     * @private
     */
    this._dimensionsString = dimensions;
 
    /**
     * An object that represents the parsed dimensions string
     * @type {Object}
     */
    this._rules = this._parse();
 
    this._validateRules();
  }
 
  /**
   * Parses the dimensions string
   * @private
   */
 
  _createClass(ImageDimensions, [{
    key: '_parse',
    value: function _parse() {
      if (typeof this._dimensionsString === 'undefined' || this._dimensionsString === null) {
        return null;
      }
 
      var match = this._dimensionsString.match(/^([0-9]+)?x([0-9]+)?([\!])?$/i);
      if (!match) {
        throw new Error('Invalid size option: ' + this._dimensionsString);
      }
 
      return {
        x: isNaN(match[1]) ? null : parseInt(match[1], 10),
        y: isNaN(match[2]) ? null : parseInt(match[2], 10),
        modifier: match[3]
      };
    }
 
    /**
     * Validates the rules
     * @private
     */
  }, {
    key: '_validateRules',
    value: function _validateRules() {
      if (this._rules === null) return;
 
      var xAvailable = this._rules.x !== null;
      var yAvailable = this._rules.y !== null;
 
      if (this._rules.modifier === this._modifiers.FIXED && !(xAvailable && yAvailable)) {
        throw new Error('Both `x` and `y` have to be set when using the fixed (!) modifier.');
      }
 
      if (!xAvailable && !yAvailable) {
        throw new Error('Neither `x` nor `y` are given.');
      }
    }
 
    /**
     * Calculates the final dimensions using the dimensions string and the
     * given initial dimensions
     * @param  {Vector2} initialDimensions
     * @return {Vector2}
     */
  }, {
    key: 'calculateFinalDimensions',
    value: function calculateFinalDimensions(initialDimensions) {
      var dimensions = initialDimensions.clone(),
          ratio;
 
      if (this._rules === null) return dimensions;
 
      /* istanbul ignore else */
      if (this._rules.modifier === this._modifiers.FIXED) {
        // Fixed dimensions
        dimensions.set(this._rules.x, this._rules.y);
      } else if (this._rules.x !== null && this._rules.y !== null) {
        // Both x and y given, resize to fit
        ratio = Math.min(this._rules.x / dimensions.x, this._rules.y / dimensions.y);
        dimensions.multiply(ratio);
      } else if (this._rules.x !== null) {
        // Fixed x, y by ratio
        ratio = initialDimensions.y / initialDimensions.x;
        dimensions.x = this._rules.x;
        dimensions.y = dimensions.x * ratio;
      } else Eif (this._rules.y !== null) {
        // Fixed y, x by ratio
        ratio = initialDimensions.x / initialDimensions.y;
        dimensions.y = this._rules.y;
        dimensions.x = dimensions.y * ratio;
      }
 
      return dimensions;
    }
  }]);
 
  return ImageDimensions;
})();
 
exports['default'] = ImageDimensions;
module.exports = exports['default'];
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