@pdfme/pdf-lib/dist/esm/__tests__/core/structures/PDFContentStream.spec.js

Create and modify PDF files with JavaScript

import pako from 'pako';
import { mergeIntoTypedArray, moveText, PDFContentStream, PDFContext, PDFDict, PDFName, PDFNumber, PDFOperator, PDFOperatorNames as Ops, PDFString, popGraphicsState, pushGraphicsState, toCharCode, typedArrayFor, } from '../../../src/index';
describe(`PDFContentStream`, () => {
    const context = PDFContext.create();
    const dict = PDFDict.withContext(context);
    const operators = [
        PDFOperator.of(Ops.BeginText),
        PDFOperator.of(Ops.SetFontAndSize, [PDFName.of('F1'), PDFNumber.of(24)]),
        PDFOperator.of(Ops.MoveText, [PDFNumber.of(100), PDFNumber.of(100)]),
        PDFOperator.of(Ops.ShowText, [PDFString.of('Hello World and stuff!')]),
        PDFOperator.of(Ops.EndText),
    ];
    it(`can be constructed from PDFContentStream.of(...)`, () => {
        expect(PDFContentStream.of(dict, operators, false)).toBeInstanceOf(PDFContentStream);
    });
    it(`allows operators to be pushed to the end of the stream`, () => {
        const stream = PDFContentStream.of(dict, [pushGraphicsState()], false);
        stream.push(moveText(21, 99), popGraphicsState());
        expect(String(stream)).toEqual('<<\n/Length 13\n>>\n' +
            'stream\n' +
            'q\n' +
            '21 99 Td\n' +
            'Q\n' +
            '\nendstream');
    });
    it(`can be cloned`, () => {
        const original = PDFContentStream.of(dict, operators, false);
        const clone = original.clone();
        expect(clone).not.toBe(original);
        expect(String(clone)).toBe(String(original));
    });
    it(`can be converted to a string`, () => {
        expect(String(PDFContentStream.of(dict, operators, false))).toEqual('<<\n/Length 55\n>>\n' +
            'stream\n' +
            'BT\n' +
            '/F1 24 Tf\n' +
            '100 100 Td\n' +
            '(Hello World and stuff!) Tj\n' +
            'ET\n' +
            '\nendstream');
    });
    it(`can provide its size in bytes`, () => {
        expect(PDFContentStream.of(dict, operators, false).sizeInBytes()).toBe(89);
    });
    it(`can be serialized`, () => {
        const stream = PDFContentStream.of(dict, operators, false);
        const buffer = new Uint8Array(stream.sizeInBytes() + 3).fill(toCharCode(' '));
        expect(stream.copyBytesInto(buffer, 2)).toBe(89);
        expect(buffer).toEqual(typedArrayFor('  <<\n/Length 55\n>>\n' +
            'stream\n' +
            'BT\n' +
            '/F1 24 Tf\n' +
            '100 100 Td\n' +
            '(Hello World and stuff!) Tj\n' +
            'ET\n' +
            '\nendstream '));
    });
    it(`can be serialized when encoded`, () => {
        const contents = 'BT\n' +
            '/F1 24 Tf\n' +
            '100 100 Td\n' +
            '(Hello World and stuff!) Tj\n' +
            'ET\n';
        const encodedContents = pako.deflate(contents);
        const stream = PDFContentStream.of(dict, operators, true);
        const buffer = new Uint8Array(stream.sizeInBytes() + 3).fill(toCharCode(' '));
        expect(stream.copyBytesInto(buffer, 2)).toBe(115);
        expect(buffer).toEqual(mergeIntoTypedArray('  <<\n/Length 60\n/Filter /FlateDecode\n>>\n', 'stream\n', encodedContents, '\nendstream '));
    });
});
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