Operators.cs

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namespace System.Data;
 
internal sealed class Operators
{
    private static readonly int[] s_priority = new int[44]
    {
        0, 20, 20, 9, 12, 11, 11, 13, 13, 13,
        13, 13, 13, 10, 11, 16, 16, 19, 19, 18,
        17, 21, 8, 7, 6, 9, 8, 7, 2, 22,
        23, 23, 24, 24, 24, 24, 24, 24, 24, 24,
        24, 24, 24, 24
    };
 
    private static readonly string[] s_looks = new string[40]
    {
        "", "-", "+", "Not", "BetweenAnd", "In", "Between", "=", ">", "<",
        ">=", "<=", "<>", "Is", "Like", "+", "-", "*", "/", "\\",
        "Mod", "**", "&", "|", "^", "~", "And", "Or", "Proc", "Iff",
        ".", ".", "Null", "True", "False", "Date", "GenUniqueId()", "GenGuid()", "Guid {..}", "Is Not"
    };
 
    internal static bool IsArithmetical(int op)
    {
        if (op != 15 && op != 16 && op != 17 && op != 18)
        {
            return op == 20;
        }
        return true;
    }
 
    internal static bool IsLogical(int op)
    {
        if (op != 26 && op != 27 && op != 3 && op != 13)
        {
            return op == 39;
        }
        return true;
    }
 
    internal static bool IsRelational(int op)
    {
        if (7 <= op)
        {
            return op <= 12;
        }
        return false;
    }
 
    internal static int Priority(int op)
    {
        if (op > s_priority.Length)
        {
            return 24;
        }
        return s_priority[op];
    }
 
    internal static string ToString(int op)
    {
        if (op <= s_looks.Length)
        {
            return s_looks[op];
        }
        return "Unknown op";
    }
}