locutus/rust/str/lines.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.lines = lines;
function lines(str) {
    //      discuss at: https://locutus.io/rust/lines/
    // parity verified: Rust 1.85
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Splits on \n or \r\n, but does not treat a lone \r as a line ending.
    //       example 1: lines('foo\nbar\n')
    //       returns 1: ['foo', 'bar']
    //       example 2: lines('foo\r\nbar\n\nbaz\r')
    //       returns 2: ['foo', 'bar', '', 'baz\r']
    //       example 3: lines('')
    //       returns 3: []
    const source = String(str);
    if (source === '') {
        return [];
    }
    const out = [];
    let start = 0;
    for (let i = 0; i < source.length; i += 1) {
        if (source[i] !== '\n') {
            continue;
        }
        const end = i > start && source[i - 1] === '\r' ? i - 1 : i;
        out.push(source.slice(start, end));
        start = i + 1;
    }
    if (start < source.length) {
        out.push(source.slice(start));
    }
    return out;
}