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Organize Pages

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This commit is contained in:
Felix Kaspar 2023-10-23 14:11:49 +02:00
parent 31b746eb4b
commit 27842a43d2
4 changed files with 131 additions and 0 deletions
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5
functions.js
View File

@ -9,6 +9,7 @@ import { scaleContent as dependantScaleContent} from './public/functions/scaleCo
import { scalePage as dependantScalePage } from './public/functions/scalePage.js';
import { splitPDF as dependantSplitPDF } from './public/functions/splitPDF.js';
import { editMetadata as dependantEditMetadata } from './public/functions/editMetadata.js';
import { organizePages as dependantOrganizePages } from './public/functions/organizePages.js';
export async function extractPages(snapshot, pagesToExtractArray) {
return dependantExtractPages(snapshot, pagesToExtractArray, PDFLib);
@ -41,3 +42,7 @@ export async function splitPDF(snapshot, splitAfterPageArray) {
export async function editMetadata(snapshot, metadata) {
return dependantEditMetadata(snapshot, metadata, PDFLib);
}
export async function organizePages(snapshot, operation, customOrderString) {
return dependantOrganizePages(snapshot, operation, customOrderString, PDFLib);
}

5
public/functions.js
View File

@ -9,6 +9,7 @@ import { scaleContent as dependantScaleContent} from './functions/scaleContent.j
import { scalePage as dependantScalePage } from './functions/scalePage.js';
import { splitPDF as dependantSplitPDF } from './functions/splitPDF.js';
import { editMetadata as dependantEditMetadata} from "./functions/editMetadata.js";
import { organizePages as dependantOrganizePages} from "./functions/organizePages.js";
export async function extractPages(snapshot, pagesToExtractArray) {
return dependantExtractPages(snapshot, pagesToExtractArray, PDFLib);
@ -41,3 +42,7 @@ export async function splitPDF(snapshot, splitAfterPageArray) {
export async function editMetadata(snapshot, metadata) {
return dependantEditMetadata(snapshot, metadata, PDFLib);
}
export async function organizePages(snapshot, operation, customOrderString) {
return dependantOrganizePages(snapshot, operation, customOrderString, PDFLib);
}

115
public/functions/organizePages.js Normal file
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@ -0,0 +1,115 @@
/**
* @typedef {"CUSTOM_PAGE_ORDER"|"REVERSE_ORDER"|"DUPLEX_SORT"|"BOOKLET_SORT"|"ODD_EVEN_SPLIT"|"REMOVE_FIRST"|"REMOVE_LAST"|"REMOVE_FIRST_AND_LAST"} OrderOperation
*/
/**
*
* @param {Uint16Array} snapshot
* @param {OrderOperation} operation
* @param {string} customOrderString
* @param {import('pdf-lib')} PDFLib
* @returns
*/
export async function organizePages(snapshot, operation, customOrderString, PDFLib) {
const pdfDoc = await PDFLib.PDFDocument.load(snapshot);
let subDocument = await PDFLib.PDFDocument.create();
const copiedPages = await subDocument.copyPages(pdfDoc, pdfDoc.getPageIndices());
const pageCount = pdfDoc.getPages().length;
switch (operation) {
case "CUSTOM_PAGE_ORDER":
console.log("Custom Order");
const pageOrderArray = parseCustomPageOrder(customOrderString, pageCount);
console.log(pageOrderArray);
const customOrderedPages = pageOrderArray.map((pageIndex) => copiedPages[pageIndex]);
customOrderedPages.forEach((page) => subDocument.addPage(page));
break;
case "REVERSE_ORDER":
const reversedPages = [];
for (let i = pageCount - 1; i >= 0; i--) {
reversedPages.push(copiedPages[i]);
}
reversedPages.forEach((page) => subDocument.addPage(page));
break;
case 'DUPLEX_SORT': //TODO: Needs to be checked by someone who knows more about duplex printing.
const duplexPages = [];
const half = (pageCount + 1) / 2
for (let i = 1; i <= half; i++) {
duplexPages.push(copiedPages[i - 1]);
if (i <= pageCount - half) {
duplexPages.push(copiedPages[pageCount - i]);
}
}
duplexPages.forEach((page) => subDocument.addPage(page));
break;
case 'BOOKLET_SORT':
const bookletPages = [];
for (let i = 0; i < pageCount / 2; i++) {
bookletPages.push(copiedPages[i]);
bookletPages.push(copiedPages[pageCount - i - 1]);
}
bookletPages.forEach((page) => subDocument.addPage(page));
break;
case 'ODD_EVEN_SPLIT':
const oddPages = [];
const evenPages = [];
for (let i = 0; i < pageCount; i++) {
if (i % 2 === 0) {
evenPages.push(copiedPages[i]);
} else {
oddPages.push(copiedPages[i]);
}
}
oddPages.forEach((page) => subDocument.addPage(page));
evenPages.forEach((page) => subDocument.addPage(page));
break;
case 'REMOVE_FIRST':
pdfDoc.removePage(0);
subDocument = pdfDoc;
break;
case 'REMOVE_LAST':
pdfDoc.removePage(pageCount - 1);
subDocument = pdfDoc;
break;
case 'REMOVE_FIRST_AND_LAST':
pdfDoc.removePage(0);
pdfDoc.removePage(pageCount - 2);
subDocument = pdfDoc;
break;
default:
throw new Error("Operation not supported");
break;
}
return subDocument.save();
};
function parseCustomPageOrder(customOrder, pageCount) {
const pageOrderArray = [];
const ranges = customOrder.split(',');
ranges.forEach((range) => {
if (range.includes('-')) {
const [start, end] = range.split('-').map(Number);
for (let i = start; i <= end; i++) {
pageOrderArray.push(i - 1);
}
} else if (range.includes('n')) {
const [even, odd] = range.split('n').map(Number);
for (let i = 1; i <= pageCount; i++) {
if (i % 2 === 0) {
pageOrderArray.push((i * even) - 1);
} else {
pageOrderArray.push((i * odd) - 1);
}
}
} else {
pageOrderArray.push(Number(range) - 1);
}
});
return pageOrderArray;
}

6
public/traverseOperations.js
View File

@ -103,6 +103,12 @@ export async function * traverseOperations(operations, input, Functions) {
input.buffer = await Functions.editMetadata(input.buffer, operation.values["metadata"]);
});
break;
case "organizePages":
yield* nToN(input, operation, async (input) => {
input.fileName += "_pagesOrganized";
input.buffer = await Functions.organizePages(input.buffer, operation.values["operation"], operation.values["customOrderString"]);
});
break;
default:
throw new Error(`${operation.type} not implemented yet.`);
break;