html-truncate-ts/dist/esm/truncate.js

TypeScript library for truncating HTML strings while preserving HTML tags and structure

import { removeImageTag, dumpCloseTag, getTag, getEndPosition, } from './truncate.helpers.js';
import { EMPTY_OBJECT, EMPTY_STRING, DEFAULT_TRUNCATE_SYMBOL, HTML_TAG_REGEX, URL_REGEX, SELF_CLOSE_REGEX, } from './truncate.const.js';
export const truncate = (string, maxLength, options) => {
    const DEFAULT_SLOP = 10 > maxLength ? maxLength : 10;
    const items = [];
    let total = 0;
    let content = EMPTY_STRING;
    let matches;
    let result;
    let index;
    let tag;
    let selfClose;
    options = options || EMPTY_OBJECT;
    options.ellipsis =
        undefined !== options.ellipsis ? options.ellipsis : DEFAULT_TRUNCATE_SYMBOL;
    options.truncateLastWord =
        undefined !== options.truncateLastWord ? options.truncateLastWord : true;
    options.slop = undefined !== options.slop ? options.slop : DEFAULT_SLOP;
    while ((matches = HTML_TAG_REGEX.exec(string))) {
        result = matches[0];
        index = matches.index;
        if (total + index > maxLength) {
            content += string.substring(0, getEndPosition(string, maxLength, total, index, options));
            break;
        }
        else {
            total += index;
            content += string.substring(0, index);
        }
        if ('/' === result[1]) {
            items.pop();
            selfClose = null;
        }
        else {
            selfClose = SELF_CLOSE_REGEX.exec(result);
            if (!selfClose) {
                tag = getTag(result);
                items.push(tag);
            }
        }
        if (selfClose) {
            content += selfClose[0];
        }
        else {
            content += result;
        }
        string = string.substring(index + result.length);
    }
    if (total >= maxLength) {
    }
    else {
        matches = URL_REGEX.exec(string);
        if (!matches || matches.index >= maxLength) {
            content += string.substring(0, getEndPosition(string, maxLength, total, undefined, options));
        }
        else {
            while (matches) {
                result = matches[0];
                index = matches.index;
                content += string.substring(0, index + result.length - total);
                string = string.substring(index + result.length);
                matches = URL_REGEX.exec(string);
            }
        }
    }
    if (string.length > maxLength - total && options.ellipsis) {
        content += options.ellipsis;
    }
    content += dumpCloseTag(items);
    if (!options.keepImageTag) {
        content = removeImageTag(content);
    }
    return content;
};
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