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* Draw wrapped text (#193) * Implemented PDFPage.drawWrappedText * Improve the function documentation. * Fix off-by-one error. * Implemented maxWidth in drawText. Also improved the performance and added support for multiple word break characters. * Fixed Regex DoS attack * Fixed new-lines * Ensure at least one breaking character is given * Fixed linting issues * Allow empty string as word breaking character * Refactor text wrapping code * Add unit test for breakTextIntoLines * Update tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| import fontkit from '@pdf-lib/fontkit'; | ||
| import { FontNames } from '@pdf-lib/standard-fonts'; | ||
| import fs from 'fs'; | ||
|
|
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| import { CustomFontEmbedder, StandardFontEmbedder } from 'src/core'; | ||
| import { breakTextIntoLines } from 'src/utils'; | ||
|
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| const font = StandardFontEmbedder.for(FontNames.Helvetica); | ||
|
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| const textSize = 24; | ||
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| const computeTextWidth = (text: string) => | ||
| font.widthOfTextAtSize(text, textSize); | ||
|
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| describe(`breakTextIntoLines`, () => { | ||
| it(`handles empty wordBreaks arrays`, () => { | ||
| const input = 'foobar-quxbaz'; | ||
| const expected = ['foobar-quxbaz']; | ||
| const actual = breakTextIntoLines(input, [], 21, computeTextWidth); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
|
|
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| it(`handles trailing newlines`, () => { | ||
| const input = 'foo\n'; | ||
| const expected = ['foo']; | ||
| const actual = breakTextIntoLines(input, [], 21, computeTextWidth); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
|
|
||
| it(`handles trailing carriage returns`, () => { | ||
| const input = 'foo\r'; | ||
| const expected = ['foo']; | ||
| const actual = breakTextIntoLines(input, [], 21, computeTextWidth); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
|
|
||
| it(`always breaks lines when EOLs are encountered`, () => { | ||
| const input = 'foo\nbar-qux\rbaz\n'; | ||
| const expected = ['foo', 'bar-qux', 'baz']; | ||
| const actual = breakTextIntoLines(input, [], 90000, computeTextWidth); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
|
|
||
| it(`breaks at the last possible 'wordBreak' before exceeding 'maxWidth' (1)`, () => { | ||
| const input = | ||
| 'Lorem Test ipsum dolor sit amet, consectetur adipiscing\nelit'; | ||
| const expected = [ | ||
| 'Lorem T', | ||
| 'est ipsu', | ||
| 'm dolor s', | ||
| 'it amet, c', | ||
| 'onsectet', | ||
| 'ur adipis', | ||
| 'cing', | ||
| 'elit', | ||
| ]; | ||
| const actual = breakTextIntoLines( | ||
| input, | ||
| ['', 'Test'], | ||
| 100, | ||
| computeTextWidth, | ||
| ); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
|
|
||
| it(`breaks at the last possible 'wordBreak' before exceeding 'maxWidth' (2)`, () => { | ||
| const input = 'Foo%bar%baz'; | ||
| const expected = ['Foo%', 'bar%baz']; | ||
| const actual = breakTextIntoLines(input, ['%'], 100, computeTextWidth); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
|
|
||
| it(`handles non-ascii code points and empty breaks`, async () => { | ||
| const sourceHansBytes = fs.readFileSync( | ||
| 'assets/fonts/source_hans_jp/SourceHanSerifJP-Regular.otf', | ||
| ); | ||
| const sourceHansFont = await CustomFontEmbedder.for( | ||
| fontkit, | ||
| sourceHansBytes, | ||
| ); | ||
|
|
||
| const input = | ||
| '遅未亮惑職界転藤柔索名午納，問通桑転加料演載満経信回込町者訟窃。'; | ||
| const expected = [ | ||
| '遅未亮惑職', | ||
| '界転藤柔索', | ||
| '名午納，問', | ||
| '通桑転加料', | ||
| '演載満経信', | ||
| '回込町者訟', | ||
| '窃。', | ||
| ]; | ||
| const actual = breakTextIntoLines(input, [''], 125, (text: string) => | ||
| sourceHansFont.widthOfTextAtSize(text, 24), | ||
| ); | ||
| expect(actual).toEqual(expected); | ||
| }); | ||
| }); |