# All files / src/utils vttcue.js

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    10x
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     /**
     * Copyright 2013 vtt.js Contributors
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    export default (function () {
      Eif (typeof window !== 'undefined' && window.VTTCue) {
        return window.VTTCue;
      }

      let autoKeyword = 'auto';
      let directionSetting = {
        '': true,
        lr: true,
        rl: true
      };
      let alignSetting = {
        start: true,
        middle: true,
        end: true,
        left: true,
        right: true
      };

      function findDirectionSetting (value) {
        if (typeof value !== 'string') {
          return false;
        }

        let dir = directionSetting[value.toLowerCase()];
        return dir ? value.toLowerCase() : false;
      }

      function findAlignSetting (value) {
        if (typeof value !== 'string') {
          return false;
        }

        let align = alignSetting[value.toLowerCase()];
        return align ? value.toLowerCase() : false;
      }

      function extend (obj) {
        let i = 1;
        for (; i < arguments.length; i++) {
          let cobj = arguments[i];
          for (let p in cobj) {
            obj[p] = cobj[p];
          }
        }

        return obj;
      }

      function VTTCue (startTime, endTime, text) {
        let cue = this;
        let isIE8 = (function () {
          if (typeof navigator === 'undefined') {
            return;
          }

          return (/MSIE\s8\.0/).test(navigator.userAgent);
        })();
        let baseObj = {};

        if (isIE8) {
          cue = document.createElement('custom');
        } else {
          baseObj.enumerable = true;
        }

        /**
         * Shim implementation specific properties. These properties are not in
         * the spec.
         */

        // Lets us know when the VTTCue's data has changed in such a way that we need
        // to recompute its display state. This lets us compute its display state
        // lazily.
        cue.hasBeenReset = false;

        /**
         * VTTCue and TextTrackCue properties
         * http://dev.w3.org/html5/webvtt/#vttcue-interface
         */

        let _id = '';
        let _pauseOnExit = false;
        let _startTime = startTime;
        let _endTime = endTime;
        let _text = text;
        let _region = null;
        let _vertical = '';
        let _snapToLines = true;
        let _line = 'auto';
        let _lineAlign = 'start';
        let _position = 50;
        let _positionAlign = 'middle';
        let _size = 50;
        let _align = 'middle';

        Object.defineProperty(cue, 'id', extend({}, baseObj, {
          get: function () {
            return _id;
          },
          set: function (value) {
            _id = '' + value;
          }
        }));

        Object.defineProperty(cue, 'pauseOnExit', extend({}, baseObj, {
          get: function () {
            return _pauseOnExit;
          },
          set: function (value) {
            _pauseOnExit = !!value;
          }
        }));

        Object.defineProperty(cue, 'startTime', extend({}, baseObj, {
          get: function () {
            return _startTime;
          },
          set: function (value) {
            if (typeof value !== 'number') {
              throw new TypeError('Start time must be set to a number.');
            }

            _startTime = value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'endTime', extend({}, baseObj, {
          get: function () {
            return _endTime;
          },
          set: function (value) {
            if (typeof value !== 'number') {
              throw new TypeError('End time must be set to a number.');
            }

            _endTime = value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'text', extend({}, baseObj, {
          get: function () {
            return _text;
          },
          set: function (value) {
            _text = '' + value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'region', extend({}, baseObj, {
          get: function () {
            return _region;
          },
          set: function (value) {
            _region = value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'vertical', extend({}, baseObj, {
          get: function () {
            return _vertical;
          },
          set: function (value) {
            let setting = findDirectionSetting(value);
            // Have to check for false because the setting an be an empty string.
            if (setting === false) {
              throw new SyntaxError('An invalid or illegal string was specified.');
            }

            _vertical = setting;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'snapToLines', extend({}, baseObj, {
          get: function () {
            return _snapToLines;
          },
          set: function (value) {
            _snapToLines = !!value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'line', extend({}, baseObj, {
          get: function () {
            return _line;
          },
          set: function (value) {
            if (typeof value !== 'number' && value !== autoKeyword) {
              throw new SyntaxError('An invalid number or illegal string was specified.');
            }

            _line = value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'lineAlign', extend({}, baseObj, {
          get: function () {
            return _lineAlign;
          },
          set: function (value) {
            let setting = findAlignSetting(value);
            if (!setting) {
              throw new SyntaxError('An invalid or illegal string was specified.');
            }

            _lineAlign = setting;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'position', extend({}, baseObj, {
          get: function () {
            return _position;
          },
          set: function (value) {
            if (value < 0 || value > 100) {
              throw new Error('Position must be between 0 and 100.');
            }

            _position = value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'positionAlign', extend({}, baseObj, {
          get: function () {
            return _positionAlign;
          },
          set: function (value) {
            let setting = findAlignSetting(value);
            if (!setting) {
              throw new SyntaxError('An invalid or illegal string was specified.');
            }

            _positionAlign = setting;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'size', extend({}, baseObj, {
          get: function () {
            return _size;
          },
          set: function (value) {
            if (value < 0 || value > 100) {
              throw new Error('Size must be between 0 and 100.');
            }

            _size = value;
            this.hasBeenReset = true;
          }
        }));

        Object.defineProperty(cue, 'align', extend({}, baseObj, {
          get: function () {
            return _align;
          },
          set: function (value) {
            let setting = findAlignSetting(value);
            if (!setting) {
              throw new SyntaxError('An invalid or illegal string was specified.');
            }

            _align = setting;
            this.hasBeenReset = true;
          }
        }));

        /**
         * Other <track> spec defined properties
         */

        // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#text-track-cue-display-state
        cue.displayState = undefined;

        if (isIE8) {
          return cue;
        }
      }

      /**
       * VTTCue methods
       */

      VTTCue.prototype.getCueAsHTML = function () {
        // Assume WebVTT.convertCueToDOMTree is on the global.
        let WebVTT = window.WebVTT;
        return WebVTT.convertCueToDOMTree(window, this.text);
      };

      return VTTCue;
    })();