"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * @file @see https://github.com/parshap/truncate-utf8-bytes
 */
function isHighSurrogate(codePoint) {
    return codePoint >= 0xd800 && codePoint <= 0xdbff;
}
function isLowSurrogate(codePoint) {
    return codePoint >= 0xdc00 && codePoint <= 0xdfff;
}
// Truncate string by size in bytes
function truncate(getLength, string, byteLength) {
    if (typeof string !== 'string') {
        throw new Error('Input must be string');
    }
    var charLength = string.length;
    var curByteLength = 0;
    var codePoint;
    var segment;
    for (var i = 0; i < charLength; i += 1) {
        codePoint = string.charCodeAt(i);
        segment = string[i];
        if (isHighSurrogate(codePoint) &&
            isLowSurrogate(string.charCodeAt(i + 1))) {
            i += 1;
            segment += string[i];
        }
        curByteLength += getLength(segment);
        if (curByteLength === byteLength) {
            return string.slice(0, i + 1);
        }
        else if (curByteLength > byteLength) {
            return string.slice(0, i - segment.length + 1);
        }
    }
    return string;
}
var getLength = Buffer.byteLength.bind(Buffer);
var fromStringToTruncatedUtf8 = truncate.bind(undefined, getLength);
exports.fromStringToTruncatedUtf8 = fromStringToTruncatedUtf8;
//# sourceMappingURL=fromStringToTruncatedUtf8.js.map