@wiris/mathtype-html-integration-devkit/src/polyfills.js

Allows to integrate MathType Web into any JavaScript HTML WYSIWYG rich text editor.

/* eslint-disable */
var polyfills;
export default polyfills;

// Polyfills.
/*! http://mths.be/codepointat v0.1.0 by @mathias */
if (!String.prototype.codePointAt) {
  (function () {
    "use strict"; // needed to support `apply`/`call` with `undefined`/`null`
    var codePointAt = function (position) {
      if (this == null) {
        throw TypeError();
      }
      var string = String(this);
      var size = string.length;
      // `ToInteger`
      var index = position ? Number(position) : 0;
      if (index != index) {
        // better `isNaN`
        index = 0;
      }
      // Account for out-of-bounds indices:
      if (index < 0 || index >= size) {
        return undefined;
      }
      // Get the first code unit
      var first = string.charCodeAt(index);
      var second;
      if (
        // check if it’s the start of a surrogate pair
        first >= 0xd800 &&
        first <= 0xdbff && // high surrogate
        size > index + 1 // there is a next code unit
      ) {
        second = string.charCodeAt(index + 1);
        if (second >= 0xdc00 && second <= 0xdfff) {
          // low surrogate
          // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
          return (first - 0xd800) * 0x400 + second - 0xdc00 + 0x10000;
        }
      }
      return first;
    };
    if (Object.defineProperty) {
      Object.defineProperty(String.prototype, "codePointAt", {
        value: codePointAt,
        configurable: true,
        writable: true,
      });
    } else {
      String.prototype.codePointAt = codePointAt;
    }
  })();
}

// Object.assign polyfill.
if (typeof Object.assign != "function") {
  // Must be writable: true, enumerable: false, configurable: true
  Object.defineProperty(Object, "assign", {
    value: function assign(target, varArgs) {
      // .length of function is 2
      "use strict";
      if (target == null) {
        // TypeError if undefined or null
        throw new TypeError("Cannot convert undefined or null to object");
      }

      var to = Object(target);

      for (var index = 1; index < arguments.length; index++) {
        var nextSource = arguments[index];

        if (nextSource != null) {
          // Skip over if undefined or null
          for (var nextKey in nextSource) {
            // Avoid bugs when hasOwnProperty is shadowed
            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
              to[nextKey] = nextSource[nextKey];
            }
          }
        }
      }
      return to;
    },
    writable: true,
    configurable: true,
  });
}

// https://tc39.github.io/ecma262/#sec-array.prototype.includes
if (!Array.prototype.includes) {
  Object.defineProperty(Array.prototype, "includes", {
    value: function (searchElement, fromIndex) {
      if (this == null) {
        throw new TypeError('"this" s null or is not defined');
      }

      // 1. Let O be ? ToObject(this value).
      var o = Object(this);

      // 2. Let len be ? ToLength(? Get(O, "length")).
      var len = o.length >>> 0;

      // 3. if len is 0, return false.
      if (len === 0) {
        return false;
      }

      // 4. Let n be ? ToInteger(fromIndex).
      //    (if fromIndex is undefinedo, this step generates the value 0.)
      var n = fromIndex | 0;

      // 5. if n ≥ 0, then
      //  a. Let k be n.
      // 6. Else n < 0,
      //  a. Let k be len + n.
      //  b. if k < 0, let k be 0.
      var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

      function sameValueZero(x, y) {
        return x === y || (typeof x === "number" && typeof y === "number" && isNaN(x) && isNaN(y));
      }

      // 7. Repeat while k < len
      while (k < len) {
        // a. let element k be the result of ? Get(O, ! ToString(k)).
        // b. if SameValueZero(searchElement, elementK) is true, return true.
        if (sameValueZero(o[k], searchElement)) {
          return true;
        }
        // c. Increase k by 1.
        k++;
      }

      // 8. Return false
      return false;
    },
  });
}

if (!String.prototype.includes) {
  String.prototype.includes = function (search, start) {
    "use strict";

    if (search instanceof RegExp) {
      throw TypeError("first argument must not be a RegExp");
    }
    if (start === undefined) {
      start = 0;
    }
    return this.indexOf(search, start) !== -1;
  };
}

if (!String.prototype.startsWith) {
  Object.defineProperty(String.prototype, "startsWith", {
    value: function (search, rawPos) {
      var pos = rawPos > 0 ? rawPos | 0 : 0;
      return this.substring(pos, pos + search.length) === search;
    },
  });
}