/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
//
// 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');
// 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');
// 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));
var outputDirectory = './svgdump';
try {
// Note: This creates a directory only one level deep. If you want to create
// multiple subdirectories on the fly, use the mkdirp module from npm.
fs.mkdirSync(outputDirectory);
} catch (e) {
if (e.code !== 'EEXIST') {
throw e;
}
}
// Dumps svg outputs to a folder called svgdump
function getFilePathForPage(pageNum) {
var name = path.basename(pdfPath, path.extname(pdfPath));
return path.join(outputDirectory, name + '-' + pageNum + '.svg');
}
/**
* A readable stream which offers a stream representing the serialization of a
* given DOM element (as defined by domstubs.js).
*
* @param {object} options
* @param {DOMElement} options.svgElement The element to serialize
*/
function ReadableSVGStream(options) {
if (!(this instanceof ReadableSVGStream)) {
return new ReadableSVGStream(options);
}
stream.Readable.call(this, options);
this.serializer = options.svgElement.getSerializer();
}
util.inherits(ReadableSVGStream, stream.Readable);
// Implements https://nodejs.org/api/stream.html#stream_readable_read_size_1
ReadableSVGStream.prototype._read = function() {
var chunk;
while ((chunk = this.serializer.getNext()) !== null) {
if (!this.push(chunk)) {
return;
}
}
this.push(null);
};
// Streams the SVG element to the given file path.
function writeSvgToFile(svgElement, filePath) {
var readableSvgStream = new ReadableSVGStream({
svgElement: svgElement,
});
var writableStream = fs.createWriteStream(filePath);
return new Promise(function(resolve, reject) {
readableSvgStream.once('error', reject);
writableStream.once('error', reject);
writableStream.once('finish', resolve);
readableSvgStream.pipe(writableStream);
}).catch(function(err) {
readableSvgStream = null; // Explicitly null because of v8 bug 6512.
writableStream.end();
throw err;
});
}
// Will be using promises to load document, pages and misc data instead of
// callback.
pdfjsLib.getDocument({
data: data,
// Try to export JPEG images directly if they don't need any further processing.
nativeImageDecoderSupport: pdfjsLib.NativeImageDecoding.DISPLAY
}).then(function (doc) {
var 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) {
return doc.getPage(pageNum).then(function (page) {
console.log('# Page ' + pageNum);
var viewport = page.getViewport(1.0 /* scale */);
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);
svgGfx.embedFonts = true;
return svgGfx.getSVG(opList, viewport).then(function (svg) {
return writeSvgToFile(svg, getFilePathForPage(pageNum)).then(function () {
console.log('Page: ' + pageNum);
}, function(err) {
console.log('Error: ' + err);
});
});
});
});
};
for (var i = 1; i <= numPages; i++) {
lastPromise = lastPromise.then(loadPage.bind(null, i));
}
return lastPromise;
}).then(function () {
console.log('# End of Document');
}, function (err) {
console.error('Error: ' + err);
});
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