source: frontend/node_modules/webpack-sources/lib/helpers/getGeneratedSourceInfo.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

/**
 * @typedef {object} GeneratedSourceInfo
 * @property {number=} generatedLine generated line
 * @property {number=} generatedColumn generated column
 * @property {string=} source source
 */

/**
 * @param {string | undefined} source source
 * @returns {GeneratedSourceInfo} source info
 */
const getGeneratedSourceInfo = (source) => {
        if (source === undefined) {
                return {};
        }
        const lastLineStart = source.lastIndexOf("\n");
        if (lastLineStart === -1) {
                return {
                        generatedLine: 1,
                        generatedColumn: source.length,
                        source,
                };
        }
        // Use native indexOf to scan for newlines instead of charCodeAt loops.
        // This is significantly faster on large sources since indexOf uses
        // vectorized/native string scanning.
        let generatedLine = 2;
        let idx = source.indexOf("\n");
        while (idx !== -1 && idx < lastLineStart) {
                generatedLine++;
                idx = source.indexOf("\n", idx + 1);
        }
        return {
                generatedLine,
                generatedColumn: source.length - lastLineStart - 1,
                source,
        };
};

module.exports = getGeneratedSourceInfo;