110 lines
5.4 KiB
C#
110 lines
5.4 KiB
C#
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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using System;
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using System.Linq;
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using System.Text.RegularExpressions;
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using System.Web;
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namespace ASC.Common.Utils
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{
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public static class HtmlUtil
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{
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private static readonly Regex tagReplacer = new Regex("<[^>]*>", RegexOptions.Multiline | RegexOptions.Compiled);
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private static readonly Regex commentsReplacer = new Regex("<!--(?s).*?-->", RegexOptions.Singleline | RegexOptions.IgnoreCase | RegexOptions.Compiled);
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private static readonly Regex xssReplacer = new Regex(@"<\s*(style|script)[^>]*>(.*?)<\s*/\s*(style|script)>", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled | RegexOptions.Singleline);
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private static readonly Regex Worder = new Regex(@"\S+", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
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public static string GetText(string html, int maxLength = 0, string endBlockTemplate = "...")
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{
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var unformatedText = string.Empty;
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if (!string.IsNullOrEmpty(html))
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{
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html = xssReplacer.Replace(html, string.Empty); //Clean malicious tags. <script> <style>
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if (string.IsNullOrEmpty(html))
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{
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return html;
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}
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unformatedText = tagReplacer.Replace(html, string.Empty);
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if (!string.IsNullOrEmpty(unformatedText))
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{
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// kill comments
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unformatedText = commentsReplacer.Replace(unformatedText, string.Empty);
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unformatedText = unformatedText.Trim();
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if (!string.IsNullOrEmpty(unformatedText))
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{
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if (maxLength == 0 || unformatedText.Length < maxLength)
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{
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return HttpUtility.HtmlDecode(unformatedText);
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}
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//Set maximum length with end block
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maxLength = Math.Max(0, maxLength - endBlockTemplate.Length);
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var startIndex = Math.Max(0, Math.Min(unformatedText.Length - 1, maxLength));
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var countToScan = Math.Max(0, startIndex - 1);
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var lastSpaceIndex = unformatedText.LastIndexOf(' ', startIndex, countToScan);
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unformatedText = lastSpaceIndex > 0 && lastSpaceIndex < unformatedText.Length
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? unformatedText.Remove(lastSpaceIndex)
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: unformatedText.Substring(0, maxLength);
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if (!string.IsNullOrEmpty(endBlockTemplate))
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{
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unformatedText += endBlockTemplate;
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}
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}
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}
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}
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return HttpUtility.HtmlDecode(unformatedText);//TODO:!!!
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}
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public static string ToPlainText(string html)
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{
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return GetText(html);
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}
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/// <summary>
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/// The function highlight all words in htmlText by searchText.
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/// </summary>
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/// <param name="searchText">the space separated string</param>
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/// <param name="htmlText">html for highlight</param>
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/// <param name="withoutLink"></param>
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/// <returns>highlighted html</returns>
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public static string SearchTextHighlight(string searchText, string htmlText, bool withoutLink = false)
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{
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if (string.IsNullOrEmpty(searchText) || string.IsNullOrEmpty(htmlText)) return htmlText;
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var regexpstr = Worder.Matches(searchText).Select(m => m.Value).Distinct().Aggregate((r, n) => r + "|" + n);
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var wordsFinder = new Regex(Regex.Escape(regexpstr), RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Multiline);
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return wordsFinder.Replace(htmlText, m => "<span class='searchTextHighlight" + (withoutLink ? " bold" : string.Empty) + "'>" + m.Value + "</span>");
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}
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}
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} |