8651ca366f
- Create merge.worker.js and alternate-merge.worker.js for offloading PDF merge operations to background threads - Migrate merge and alternate-merge logic to use Web Worker architecture for improved performance - Move flatten tool from singlePdfLoadTools to multiFileTools configuration - Update merge and alternate-merge tool subtitles to indicate bookmark preservation - Refactor alternate-merge.ts to use Web Worker instead of pdf-lib for interleaving operations - Refactor merge.ts to use Web Worker for standard merge operations - Update fileHandler.ts to recognize flatten as a multi-file tool requiring process button handling - Simplify form-creator.ts and flatten.ts implementations with Web Worker integration - Update UI state management to support Web Worker-based PDF processing - Improve performance by moving computationally intensive PDF operations off the main thread
71 lines
2.2 KiB
JavaScript
71 lines
2.2 KiB
JavaScript
self.importScripts('/coherentpdf.browser.min.js');
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self.onmessage = function (e) {
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const { command, files, jobs } = e.data;
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if (command === 'merge') {
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mergePDFs(files, jobs);
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}
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};
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function mergePDFs(files, jobs) {
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try {
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const loadedPdfs = {};
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const pdfsToMerge = [];
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const rangesToMerge = [];
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for (const file of files) {
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const uint8Array = new Uint8Array(file.data);
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const pdfDoc = coherentpdf.fromMemory(uint8Array, "");
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loadedPdfs[file.name] = pdfDoc;
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}
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for (const job of jobs) {
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const sourcePdf = loadedPdfs[job.fileName];
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if (!sourcePdf) continue;
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let range;
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if (job.rangeType === 'all') {
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range = coherentpdf.all(sourcePdf);
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} else if (job.rangeType === 'specific') {
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if (coherentpdf.validatePagespec(job.rangeString)) {
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range = coherentpdf.parsePagespec(sourcePdf, job.rangeString);
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} else {
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range = coherentpdf.all(sourcePdf);
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}
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} else if (job.rangeType === 'single') {
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const pageNum = job.pageIndex + 1;
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range = coherentpdf.range(pageNum, pageNum);
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} else if (job.rangeType === 'range') {
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range = coherentpdf.range(job.startPage, job.endPage);
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}
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pdfsToMerge.push(sourcePdf);
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rangesToMerge.push(range);
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}
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if (pdfsToMerge.length === 0) {
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throw new Error('No valid files or pages to merge.');
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}
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const mergedPdf = coherentpdf.mergeSame(pdfsToMerge, true, true, rangesToMerge);
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const mergedPdfBytes = coherentpdf.toMemory(mergedPdf, false, true);
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const buffer = mergedPdfBytes.buffer;
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coherentpdf.deletePdf(mergedPdf);
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Object.values(loadedPdfs).forEach(pdf => coherentpdf.deletePdf(pdf));
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self.postMessage({
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status: 'success',
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pdfBytes: buffer
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}, [buffer]);
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} catch (error) {
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self.postMessage({
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status: 'error',
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message: error.message || 'Unknown error during merge'
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});
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}
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}
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