// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System.Globalization
{
    /// <summary>
    /// Contains valid formats for Numbers recognized by the Number
    /// class' parsing code.
    /// </summary>
    [Flags]
    public enum NumberStyles
    {
        None = 0x00000000,
 
        /// <summary>
        /// Bit flag indicating that leading whitespace is allowed. Character values
        /// 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, and 0x0020 are considered to be
        /// whitespace.
        /// </summary>
        AllowLeadingWhite = 0x00000001,
 
        /// <summary>
        /// Bitflag indicating trailing whitespace is allowed.
        /// </summary>
        AllowTrailingWhite = 0x00000002,
 
        /// <summary>
        /// Can the number start with a sign char specified by
        /// NumberFormatInfo.PositiveSign and NumberFormatInfo.NegativeSign
        /// </summary>
        AllowLeadingSign = 0x00000004,
 
        /// <summary>
        /// Allow the number to end with a sign char
        /// </summary>
        AllowTrailingSign = 0x00000008,
 
        /// <summary>
        /// Allow the number to be enclosed in parens
        /// </summary>
        AllowParentheses = 0x00000010,
 
        AllowDecimalPoint = 0x00000020,
 
        AllowThousands = 0x00000040,
 
        AllowExponent = 0x00000080,
 
        AllowCurrencySymbol = 0x00000100,
 
        AllowHexSpecifier = 0x00000200,
 
        /// <summary>
        /// Indicates that the numeric string represents a binary value. Valid binary values include the numeric digits 0 and 1.
        /// Strings that are parsed using this style do not employ a prefix; "0b" cannot be used. A string that is parsed with
        /// the <see cref="AllowBinarySpecifier"/> style will always be interpreted as a binary value. The only flags that can
        /// be combined with <see cref="AllowBinarySpecifier"/> are <see cref="AllowLeadingWhite"/> and <see cref="AllowTrailingWhite"/>.
        /// The <see cref="NumberStyles"/> enumeration includes a composite style, <see cref="BinaryNumber"/>, that consists of
        /// these three flags.
        /// </summary>
        AllowBinarySpecifier = 0x00000400,
 
        Integer = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign,
 
        HexNumber = AllowLeadingWhite | AllowTrailingWhite | AllowHexSpecifier,
 
        /// <summary>Indicates that the <see cref="AllowLeadingWhite"/>, <see cref="AllowTrailingWhite"/>, and <see cref="AllowBinarySpecifier"/> styles are used. This is a composite number style.</summary>
        BinaryNumber = AllowLeadingWhite | AllowTrailingWhite | AllowBinarySpecifier,
 
        Number = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign |
                   AllowDecimalPoint | AllowThousands,
 
        Float = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign |
                   AllowDecimalPoint | AllowExponent,
 
        Currency = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign |
                   AllowParentheses | AllowDecimalPoint | AllowThousands | AllowCurrencySymbol,
 
        Any = AllowLeadingWhite | AllowTrailingWhite | AllowLeadingSign | AllowTrailingSign |
                   AllowParentheses | AllowDecimalPoint | AllowThousands | AllowCurrencySymbol | AllowExponent,
    }
}