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Replace *most* cases of var with let/const in the examples/ folder

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These changes were done automatically, by using the `gulp lint --fix` command, in preparation for the next patch.
This commit is contained in:
Jonas Jenwald 2021-03-12 17:08:17 +01:00
parent 56fd01bf8d
commit 276fa4ad8f
15 changed files with 196 additions and 194 deletions
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43
examples/node/pdf2svg.js
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@ -5,26 +5,27 @@
// Node tool to dump SVG output into a file.
//
var fs = require("fs");
var util = require("util");
var path = require("path");
var stream = require("stream");
const fs = require("fs");
const util = require("util");
const path = require("path");
const stream = require("stream");
// HACK few hacks to let PDF.js be loaded not as a module in global space.
require("./domstubs.js").setStubs(global);
// Run `gulp dist-install` to generate 'pdfjs-dist' npm package files.
var pdfjsLib = require("pdfjs-dist/legacy/build/pdf.js");
const pdfjsLib = require("pdfjs-dist/legacy/build/pdf.js");
// Some PDFs need external cmaps.
var CMAP_URL = "../../node_modules/pdfjs-dist/cmaps/";
var CMAP_PACKED = true;
const CMAP_URL = "../../node_modules/pdfjs-dist/cmaps/";
const CMAP_PACKED = true;
// Loading file from file system into typed array
var pdfPath = process.argv[2] || "../../web/compressed.tracemonkey-pldi-09.pdf";
var data = new Uint8Array(fs.readFileSync(pdfPath));
const pdfPath =
process.argv[2] || "../../web/compressed.tracemonkey-pldi-09.pdf";
const data = new Uint8Array(fs.readFileSync(pdfPath));
var outputDirectory = "./svgdump";
const outputDirectory = "./svgdump";
try {
// Note: This creates a directory only one level deep. If you want to create
@ -38,7 +39,7 @@ try {
// Dumps svg outputs to a folder called svgdump
function getFilePathForPage(pageNum) {
var name = path.basename(pdfPath, path.extname(pdfPath));
const name = path.basename(pdfPath, path.extname(pdfPath));
return path.join(outputDirectory, name + "-" + pageNum + ".svg");
}
@ -59,7 +60,7 @@ function ReadableSVGStream(options) {
util.inherits(ReadableSVGStream, stream.Readable);
// Implements https://nodejs.org/api/stream.html#stream_readable_read_size_1
ReadableSVGStream.prototype._read = function () {
var chunk;
let chunk;
while ((chunk = this.serializer.getNext()) !== null) {
if (!this.push(chunk)) {
return;
@ -70,10 +71,10 @@ ReadableSVGStream.prototype._read = function () {
// Streams the SVG element to the given file path.
function writeSvgToFile(svgElement, filePath) {
var readableSvgStream = new ReadableSVGStream({
let readableSvgStream = new ReadableSVGStream({
svgElement,
});
var writableStream = fs.createWriteStream(filePath);
const writableStream = fs.createWriteStream(filePath);
return new Promise(function (resolve, reject) {
readableSvgStream.once("error", reject);
writableStream.once("error", reject);
@ -88,7 +89,7 @@ function writeSvgToFile(svgElement, filePath) {
// Will be using promises to load document, pages and misc data instead of
// callback.
var loadingTask = pdfjsLib.getDocument({
const loadingTask = pdfjsLib.getDocument({
data,
cMapUrl: CMAP_URL,
cMapPacked: CMAP_PACKED,
@ -96,21 +97,21 @@ var loadingTask = pdfjsLib.getDocument({
});
loadingTask.promise
.then(function (doc) {
var numPages = doc.numPages;
const numPages = doc.numPages;
console.log("# Document Loaded");
console.log("Number of Pages: " + numPages);
console.log();
var lastPromise = Promise.resolve(); // will be used to chain promises
var loadPage = function (pageNum) {
let lastPromise = Promise.resolve(); // will be used to chain promises
const loadPage = function (pageNum) {
return doc.getPage(pageNum).then(function (page) {
console.log("# Page " + pageNum);
var viewport = page.getViewport({ scale: 1.0 });
const viewport = page.getViewport({ scale: 1.0 });
console.log("Size: " + viewport.width + "x" + viewport.height);
console.log();
return page.getOperatorList().then(function (opList) {
var svgGfx = new pdfjsLib.SVGGraphics(page.commonObjs, page.objs);
const svgGfx = new pdfjsLib.SVGGraphics(page.commonObjs, page.objs);
svgGfx.embedFonts = true;
return svgGfx.getSVG(opList, viewport).then(function (svg) {
return writeSvgToFile(svg, getFilePathForPage(pageNum)).then(
@ -126,7 +127,7 @@ loadingTask.promise
});
};
for (var i = 1; i <= numPages; i++) {
for (let i = 1; i <= numPages; i++) {
lastPromise = lastPromise.then(loadPage.bind(null, i));
}
return lastPromise;