28 lines
1.0 KiB
C#
28 lines
1.0 KiB
C#
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using System.Net;
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using System.Text.RegularExpressions;
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using Microsoft.AspNetCore.Html;
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namespace JobsMedical.Web.Services;
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/// <summary>Wraps query terms in <mark> for result highlighting (HTML-safe).</summary>
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public static class SearchHighlight
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{
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public static HtmlString Mark(string? text, string? query)
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{
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if (string.IsNullOrEmpty(text)) return HtmlString.Empty;
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var encoded = WebUtility.HtmlEncode(text);
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if (string.IsNullOrWhiteSpace(query)) return new HtmlString(encoded);
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var terms = query.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
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.Where(t => t.Length >= 2)
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.Select(t => Regex.Escape(WebUtility.HtmlEncode(t)))
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.Distinct()
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.ToList();
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if (terms.Count == 0) return new HtmlString(encoded);
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var pattern = string.Join("|", terms);
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var marked = Regex.Replace(encoded, pattern, m => $"<mark>{m.Value}</mark>", RegexOptions.IgnoreCase);
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return new HtmlString(marked);
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}
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}
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