XPathCompileException.cs

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using System.Runtime.Serialization;
using System.Text;
 
namespace System.Xml.Xsl.XPath;
 
[Serializable]
internal sealed class XPathCompileException : XslLoadException
{
    private enum TrimType
    {
        Left,
        Right,
        Middle
    }
 
    public string queryString;
 
    public int startChar;
 
    public int endChar;
 
    internal XPathCompileException(string queryString, int startChar, int endChar, string resId, params string[] args)
        : base(resId, args)
    {
        this.queryString = queryString;
        this.startChar = startChar;
        this.endChar = endChar;
    }
 
    internal XPathCompileException(string resId, params string[] args)
        : base(resId, args)
    {
    }
 
    internal XPathCompileException(SerializationInfo info, StreamingContext context)
        : base(info, context)
    {
        queryString = (string)info.GetValue("QueryString", typeof(string));
        startChar = (int)info.GetValue("StartChar", typeof(int));
        endChar = (int)info.GetValue("EndChar", typeof(int));
    }
 
    public override void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        base.GetObjectData(info, context);
        info.AddValue("QueryString", queryString);
        info.AddValue("StartChar", startChar);
        info.AddValue("EndChar", endChar);
    }
 
    private static void AppendTrimmed(StringBuilder sb, string value, int startIndex, int count, TrimType trimType)
    {
        if (count <= 32)
        {
            sb.Append(value, startIndex, count);
            return;
        }
        switch (trimType)
        {
        case TrimType.Left:
            sb.Append("...");
            sb.Append(value, startIndex + count - 32, 32);
            break;
        case TrimType.Right:
            sb.Append(value, startIndex, 32);
            sb.Append("...");
            break;
        case TrimType.Middle:
            sb.Append(value, startIndex, 16);
            sb.Append("...");
            sb.Append(value, startIndex + count - 16, 16);
            break;
        }
    }
 
    internal string MarkOutError()
    {
        if (queryString == null || queryString.Trim(' ').Length == 0)
        {
            return null;
        }
        int num = endChar - startChar;
        StringBuilder stringBuilder = new StringBuilder();
        AppendTrimmed(stringBuilder, queryString, 0, startChar, TrimType.Left);
        if (num > 0)
        {
            stringBuilder.Append(" -->");
            AppendTrimmed(stringBuilder, queryString, startChar, num, TrimType.Middle);
        }
        stringBuilder.Append("<-- ");
        AppendTrimmed(stringBuilder, queryString, endChar, queryString.Length - endChar, TrimType.Right);
        return stringBuilder.ToString();
    }
 
    internal override string FormatDetailedMessage()
    {
        string text = Message;
        string text2 = MarkOutError();
        if (text2 != null && text2.Length > 0)
        {
            if (text.Length > 0)
            {
                text += Environment.NewLine;
            }
            text += text2;
        }
        return text;
    }
}