cjke-strings/lib/limitWidth.js

a set of Chinese Japanese Korean and Emoji strings helpers

import { everything } from './base.js';
import { readFirstCompleteChar } from './firstCompleteChar.js';
function returnValue(original, length, width) {
    const result = Number.isFinite(length) ? original.slice(0, length) : original;
    const remaining = Number.isFinite(length) ? original.slice(length) : '';
    return {
        result,
        width,
        remaining,
        toString() {
            return result;
        },
        [Symbol.toPrimitive]() {
            return result;
        },
    };
}
export function limitWidth(original, limit, supports = everything) {
    let width = 0;
    let str = original;
    while (str.length > 0) {
        const item = readFirstCompleteChar(str, supports);
        const nextWidth = width + item.width;
        if (nextWidth > limit) {
            return returnValue(original, original.length - str.length, width);
        }
        width += item.width;
        if (width === limit) {
            return returnValue(original, original.length - str.length + item.length, width);
        }
        str = str.slice(item.length);
    }
    return returnValue(original, Number.POSITIVE_INFINITY, width);
}
export function chunkText(text, width, supports = everything) {
    const result = [];
    while (text.length > 0) {
        const item = limitWidth(text, width, supports);
        result.push(item.toString());
        text = item.remaining;
    }
    return result;
}
export function boxText(text, width, supports = everything) {
    const lines = text.split('\n');
    const result = [];
    for (const line of lines) {
        result.push(...chunkText(line, width, supports));
    }
    return result;
}
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