CloudMusic/FNZCM/FNZCM.BlazorWasm/UI/Components/HighLightKeyword.razor

@inherits FnzComponentBase
@code {
    [Parameter, Required] public string Text { get; set; }
    [Parameter, Required] public IReadOnlyCollection<string> Keywords { get; set; }
}

@if (string.IsNullOrEmpty(Text) == false)
{
    var lowerText = Text.ToLower();
    for (var index = 0; index < Text.Length; ++index)
    {
        bool match = false;

        foreach (var kw in Keywords.Where(p => string.IsNullOrEmpty(p) == false).OrderByDescending(p => p.Length))
        {
            match = true;
            var lowerKw = kw.ToLower();
            for (var ki = 0; ki < kw.Length; ++ki)
            {
                if (index + ki >= Text.Length || lowerText[index + ki] != lowerKw[ki])
                {
                    match = false;
                    break;
                }
            }

            if (match)
            {
                <span class="text-danger">@Text.Substring(index,kw.Length)</span>
                index += kw.Length - 1;
                break;
            }
        }

        if (index < Text.Length && match == false)
        {
            <span>@Text[index]</span>
        }
    }
}