d188b66af6
The existing Node.js-specific polyfills depend on the `node-canvas` package, which has unfortunately (repeatedly) shown to cause trouble for many users. We attempted to improve the situation by listing the relevant packages as `optionalDependencies`, but that didn't seem to really fix the problem. With this patch the library should be able to load in Node.js-environments even if polyfilling fails, and any errors will instead occur during rendering. Obviously this is *not* a proper solution, since it basically moves the problem to another part of the code-base. However for certain "simpler" use-cases, such as e.g. text-extraction, these changes should hopefully improve general usability of the PDF.js library in Node.js-environments. *Please note:* For most PDF documents rendering should still work though, since `DOMMatrix` is *currently* only used with Patterns and `Path2D` only with Type3-fonts and Patterns.
110 lines
2.8 KiB
JavaScript
110 lines
2.8 KiB
JavaScript
/* Copyright 2020 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* globals __non_webpack_require__ */
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import {
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BaseCanvasFactory,
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BaseCMapReaderFactory,
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BaseFilterFactory,
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BaseStandardFontDataFactory,
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} from "./base_factory.js";
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import { isNodeJS, warn } from "../shared/util.js";
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
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throw new Error(
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'Module "./node_utils.js" shall not be used with MOZCENTRAL builds.'
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);
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}
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if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("SKIP_BABEL")) {
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(function checkDOMMatrix() {
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if (globalThis.DOMMatrix || !isNodeJS) {
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return;
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}
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try {
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globalThis.DOMMatrix = __non_webpack_require__("canvas").DOMMatrix;
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} catch (ex) {
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warn(`Cannot polyfill \`DOMMatrix\`, rendering may be broken: "${ex}".`);
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}
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})();
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(function checkPath2D() {
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if (globalThis.Path2D || !isNodeJS) {
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return;
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}
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try {
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const { CanvasRenderingContext2D } = __non_webpack_require__("canvas");
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const { polyfillPath2D } = __non_webpack_require__("path2d-polyfill");
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globalThis.CanvasRenderingContext2D = CanvasRenderingContext2D;
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polyfillPath2D(globalThis);
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} catch (ex) {
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warn(`Cannot polyfill \`Path2D\`, rendering may be broken: "${ex}".`);
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}
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})();
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}
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const fetchData = function (url) {
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return new Promise((resolve, reject) => {
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const fs = __non_webpack_require__("fs");
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fs.readFile(url, (error, data) => {
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if (error || !data) {
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reject(new Error(error));
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return;
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}
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resolve(new Uint8Array(data));
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});
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});
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};
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class NodeFilterFactory extends BaseFilterFactory {}
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class NodeCanvasFactory extends BaseCanvasFactory {
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/**
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* @ignore
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*/
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_createCanvas(width, height) {
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const Canvas = __non_webpack_require__("canvas");
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return Canvas.createCanvas(width, height);
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}
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}
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class NodeCMapReaderFactory extends BaseCMapReaderFactory {
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/**
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* @ignore
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*/
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_fetchData(url, compressionType) {
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return fetchData(url).then(data => {
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return { cMapData: data, compressionType };
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});
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}
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}
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class NodeStandardFontDataFactory extends BaseStandardFontDataFactory {
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/**
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* @ignore
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*/
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_fetchData(url) {
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return fetchData(url);
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}
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}
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export {
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NodeCanvasFactory,
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NodeCMapReaderFactory,
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NodeFilterFactory,
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NodeStandardFontDataFactory,
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};
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