pdf.js/src/shared/compatibility.js
Jonas Jenwald 9e262ae7fa Enable the ESLint prefer-const rule globally (PR 11450 follow-up)
Please find additional details about the ESLint rule at https://eslint.org/docs/rules/prefer-const

With the recent introduction of Prettier this sort of mass enabling of ESLint rules becomes a lot easier, since the code will be automatically reformatted as necessary to account for e.g. changed line lengths.

Note that this patch is generated automatically, by using the ESLint `--fix` argument, and will thus require some additional clean-up (which is done separately).
2020-01-25 00:20:22 +01:00

353 lines
10 KiB
JavaScript

/* Copyright 2017 Mozilla Foundation
*
* 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.
*/
/* eslint no-var: error */
// Skip compatibility checks for modern builds and if we already ran the module.
if (
(typeof PDFJSDev === "undefined" || !PDFJSDev.test("SKIP_BABEL")) &&
(typeof globalThis === "undefined" || !globalThis._pdfjsCompatibilityChecked)
) {
// Provides support for globalThis in legacy browsers.
// Support: IE11/Edge, Opera
if (typeof globalThis === "undefined" || globalThis.Math !== Math) {
// eslint-disable-next-line no-global-assign
globalThis = require("core-js/es/global-this");
}
globalThis._pdfjsCompatibilityChecked = true;
const { isNodeJS } = require("./is_node.js");
const hasDOM = typeof window === "object" && typeof document === "object";
const userAgent =
(typeof navigator !== "undefined" && navigator.userAgent) || "";
const isIE = /Trident/.test(userAgent);
// Support: Node.js
(function checkNodeBtoa() {
if (globalThis.btoa || !isNodeJS) {
return;
}
globalThis.btoa = function(chars) {
// eslint-disable-next-line no-undef
return Buffer.from(chars, "binary").toString("base64");
};
})();
// Support: Node.js
(function checkNodeAtob() {
if (globalThis.atob || !isNodeJS) {
return;
}
globalThis.atob = function(input) {
// eslint-disable-next-line no-undef
return Buffer.from(input, "base64").toString("binary");
};
})();
// Provides support for ChildNode.remove in legacy browsers.
// Support: IE.
(function checkChildNodeRemove() {
if (!hasDOM) {
return;
}
if (typeof Element.prototype.remove !== "undefined") {
return;
}
Element.prototype.remove = function() {
if (this.parentNode) {
// eslint-disable-next-line mozilla/avoid-removeChild
this.parentNode.removeChild(this);
}
};
})();
// Provides support for DOMTokenList.prototype.{add, remove}, with more than
// one parameter, in legacy browsers.
// Support: IE
(function checkDOMTokenListAddRemove() {
if (!hasDOM || isNodeJS) {
return;
}
const div = document.createElement("div");
div.classList.add("testOne", "testTwo");
if (
div.classList.contains("testOne") === true &&
div.classList.contains("testTwo") === true
) {
return;
}
const OriginalDOMTokenListAdd = DOMTokenList.prototype.add;
const OriginalDOMTokenListRemove = DOMTokenList.prototype.remove;
DOMTokenList.prototype.add = function(...tokens) {
for (const token of tokens) {
OriginalDOMTokenListAdd.call(this, token);
}
};
DOMTokenList.prototype.remove = function(...tokens) {
for (const token of tokens) {
OriginalDOMTokenListRemove.call(this, token);
}
};
})();
// Provides support for DOMTokenList.prototype.toggle, with the optional
// "force" parameter, in legacy browsers.
// Support: IE
(function checkDOMTokenListToggle() {
if (!hasDOM || isNodeJS) {
return;
}
const div = document.createElement("div");
if (div.classList.toggle("test", 0) === false) {
return;
}
DOMTokenList.prototype.toggle = function(token) {
const force =
arguments.length > 1 ? !!arguments[1] : !this.contains(token);
return this[force ? "add" : "remove"](token), force;
};
})();
// Provides support for window.history.{pushState, replaceState}, with the
// `url` parameter set to `undefined`, without breaking the document URL.
// Support: IE
(function checkWindowHistoryPushStateReplaceState() {
if (!hasDOM || !isIE) {
return;
}
const OriginalPushState = window.history.pushState;
const OriginalReplaceState = window.history.replaceState;
window.history.pushState = function(state, title, url) {
const args = url === undefined ? [state, title] : [state, title, url];
OriginalPushState.apply(this, args);
};
window.history.replaceState = function(state, title, url) {
const args = url === undefined ? [state, title] : [state, title, url];
OriginalReplaceState.apply(this, args);
};
})();
// Provides support for String.prototype.startsWith in legacy browsers.
// Support: IE, Chrome<41
(function checkStringStartsWith() {
if (String.prototype.startsWith) {
return;
}
require("core-js/es/string/starts-with.js");
})();
// Provides support for String.prototype.endsWith in legacy browsers.
// Support: IE, Chrome<41
(function checkStringEndsWith() {
if (String.prototype.endsWith) {
return;
}
require("core-js/es/string/ends-with.js");
})();
// Provides support for String.prototype.includes in legacy browsers.
// Support: IE, Chrome<41
(function checkStringIncludes() {
if (String.prototype.includes) {
return;
}
require("core-js/es/string/includes.js");
})();
// Provides support for Array.prototype.includes in legacy browsers.
// Support: IE, Chrome<47
(function checkArrayIncludes() {
if (Array.prototype.includes) {
return;
}
require("core-js/es/array/includes.js");
})();
// Provides support for Array.from in legacy browsers.
// Support: IE
(function checkArrayFrom() {
if (Array.from) {
return;
}
require("core-js/es/array/from.js");
})();
// Provides support for Object.assign in legacy browsers.
// Support: IE
(function checkObjectAssign() {
if (Object.assign) {
return;
}
require("core-js/es/object/assign.js");
})();
// Provides support for Math.log2 in legacy browsers.
// Support: IE, Chrome<38
(function checkMathLog2() {
if (Math.log2) {
return;
}
Math.log2 = require("core-js/es/math/log2.js");
})();
// Provides support for Number.isNaN in legacy browsers.
// Support: IE.
(function checkNumberIsNaN() {
if (Number.isNaN) {
return;
}
Number.isNaN = require("core-js/es/number/is-nan.js");
})();
// Provides support for Number.isInteger in legacy browsers.
// Support: IE, Chrome<34
(function checkNumberIsInteger() {
if (Number.isInteger) {
return;
}
Number.isInteger = require("core-js/es/number/is-integer.js");
})();
// Support: IE, Safari<11, Chrome<63
(function checkPromise() {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
// The current image decoders are synchronous, hence `Promise` shouldn't
// need to be polyfilled for the IMAGE_DECODERS build target.
return;
}
if (globalThis.Promise && globalThis.Promise.allSettled) {
return;
}
globalThis.Promise = require("core-js/es/promise/index.js");
})();
// Support: IE
(function checkURL() {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
// The current image decoders don't use the `URL` constructor, so it
// doesn't need to be polyfilled for the IMAGE_DECODERS build target.
return;
}
if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("GENERIC")) {
// The `URL` constructor is assumed to be available in the extension
// builds.
return;
}
globalThis.URL = require("core-js/web/url.js");
})();
// Support: IE, Node.js
(function checkReadableStream() {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
// The current image decoders are synchronous, hence `ReadableStream`
// shouldn't need to be polyfilled for the IMAGE_DECODERS build target.
return;
}
let isReadableStreamSupported = false;
if (typeof ReadableStream !== "undefined") {
// MS Edge may say it has ReadableStream but they are not up to spec yet.
try {
// eslint-disable-next-line no-new
new ReadableStream({
start(controller) {
controller.close();
},
});
isReadableStreamSupported = true;
} catch (e) {
// The ReadableStream constructor cannot be used.
}
}
if (isReadableStreamSupported) {
return;
}
globalThis.ReadableStream = require("web-streams-polyfill/dist/ponyfill.js").ReadableStream;
})();
// Support: IE<11, Safari<8, Chrome<36
(function checkWeakMap() {
if (globalThis.WeakMap) {
return;
}
globalThis.WeakMap = require("core-js/es/weak-map/index.js");
})();
// Support: IE11
(function checkWeakSet() {
if (globalThis.WeakSet) {
return;
}
globalThis.WeakSet = require("core-js/es/weak-set/index.js");
})();
// Provides support for String.codePointAt in legacy browsers.
// Support: IE11.
(function checkStringCodePointAt() {
if (String.prototype.codePointAt) {
return;
}
require("core-js/es/string/code-point-at.js");
})();
// Provides support for String.fromCodePoint in legacy browsers.
// Support: IE11.
(function checkStringFromCodePoint() {
if (String.fromCodePoint) {
return;
}
String.fromCodePoint = require("core-js/es/string/from-code-point.js");
})();
// Support: IE
(function checkSymbol() {
if (globalThis.Symbol) {
return;
}
require("core-js/es/symbol/index.js");
})();
// Provides support for String.prototype.padStart in legacy browsers.
// Support: IE, Chrome<57
(function checkStringPadStart() {
if (String.prototype.padStart) {
return;
}
require("core-js/es/string/pad-start.js");
})();
// Provides support for String.prototype.padEnd in legacy browsers.
// Support: IE, Chrome<57
(function checkStringPadEnd() {
if (String.prototype.padEnd) {
return;
}
require("core-js/es/string/pad-end.js");
})();
// Provides support for Object.values in legacy browsers.
// Support: IE, Chrome<54
(function checkObjectValues() {
if (Object.values) {
return;
}
Object.values = require("core-js/es/object/values.js");
})();
}