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@foliojs-fork/linebreak
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An implementation of the Unicode Line Breaking Algorithm (UAX #14)
Line breaking, also known as word wrapping, is the process of breaking a section of text into lines such that it will fit in the available width of a page, window or other display area. The Unicode Line Breaking Algorithm performs part of this process. Given an input text, it produces a set of positions called "break opportunities" that are appropriate points to begin a new line. The selection of actual line break positions from the set of break opportunities is not covered by the Unicode Line Breaking Algorithm, but is in the domain of higher level software with knowledge of the available width and the display size of the text.
This is a JavaScript implementation of the Unicode Line Breaking Algorithm for Node.js (and browsers I guess). Currently supports Unicode version 13. It is used by PDFKit for line wrapping text in PDF documents, but since the algorithm knows nothing about the actual visual appearance or layout of text, it could be used for other things as well.
Because on original repo is not possible release new version on npm see foliojs/linebreak#24. This fork is same as original repo and is maintained up-to-date. This forks contains these changes:
You can install via npm
npm install @foliojs-fork/linebreak
var LineBreaker = require('linebreak');
var lorem = 'lorem ipsum...';
var breaker = new LineBreaker(lorem);
var last = 0;
var bk;
while (bk = breaker.nextBreak()) {
// get the string between the last break and this one
var word = lorem.slice(last, bk.position);
console.log(word);
// you can also check bk.required to see if this was a required break...
if (bk.required) {
console.log('\n\n');
}
last = bk.position;
}
In order to use the library, you shouldn't need to know this, but if you're interested in contributing or fixing bugs, these things might be of interest.
The src/classes.js
file is automatically generated from LineBreak.txt
in the Unicode
database by src/generate_data.js
. It should be rare that you need to run this, but
you may if, for instance, you want to change the Unicode version.
You can run the tests using npm test
. They are written using mocha
, and generated from
LineBreakTest.txt
from the Unicode database, which is included in the repository for performance
reasons while running them. About 50 of the over 7600 tests are currently skipped due to
implementation differences. It appears that some of the tests may be wrong or use different
tailoring from the spec.
MIT
FAQs
An implementation of the Unicode Line Breaking Algorithm (UAX #14)
The npm package @foliojs-fork/linebreak receives a total of 737,159 weekly downloads. As such, @foliojs-fork/linebreak popularity was classified as popular.
We found that @foliojs-fork/linebreak demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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