XmlComplianceUtil.cs

Go to the documentation of this file.

using System.Text;
 
namespace System.Xml;
 
internal static class XmlComplianceUtil
{
    public static string NonCDataNormalize(string value)
    {
        int length = value.Length;
        if (length <= 0)
        {
            return string.Empty;
        }
        int num = 0;
        StringBuilder stringBuilder = null;
        while (XmlCharType.IsWhiteSpace(value[num]))
        {
            num++;
            if (num == length)
            {
                return " ";
            }
        }
        int num2 = num;
        while (num2 < length)
        {
            if (!XmlCharType.IsWhiteSpace(value[num2]))
            {
                num2++;
                continue;
            }
            int i;
            for (i = num2 + 1; i < length && XmlCharType.IsWhiteSpace(value[i]); i++)
            {
            }
            if (i == length)
            {
                if (stringBuilder == null)
                {
                    return value.Substring(num, num2 - num);
                }
                stringBuilder.Append(value, num, num2 - num);
                return stringBuilder.ToString();
            }
            if (i > num2 + 1 || value[num2] != ' ')
            {
                if (stringBuilder == null)
                {
                    stringBuilder = new StringBuilder(length);
                }
                stringBuilder.Append(value, num, num2 - num);
                stringBuilder.Append(' ');
                num = i;
                num2 = i;
            }
            else
            {
                num2++;
            }
        }
        if (stringBuilder != null)
        {
            if (num < num2)
            {
                stringBuilder.Append(value, num, num2 - num);
            }
            return stringBuilder.ToString();
        }
        if (num > 0)
        {
            return value.Substring(num, length - num);
        }
        return value;
    }
 
    public static string CDataNormalize(string value)
    {
        int length = value.Length;
        if (length <= 0)
        {
            return string.Empty;
        }
        int num = 0;
        int num2 = 0;
        StringBuilder stringBuilder = null;
        while (num < length)
        {
            char c = value[num];
            switch (c)
            {
            default:
                num++;
                break;
            case '\t':
            case '\n':
            case '\r':
                if (stringBuilder == null)
                {
                    stringBuilder = new StringBuilder(length);
                }
                if (num2 < num)
                {
                    stringBuilder.Append(value, num2, num - num2);
                }
                stringBuilder.Append(' ');
                num = ((c != '\r' || num + 1 >= length || value[num + 1] != '\n') ? (num + 1) : (num + 2));
                num2 = num;
                break;
            }
        }
        if (stringBuilder == null)
        {
            return value;
        }
        if (num > num2)
        {
            stringBuilder.Append(value, num2, num - num2);
        }
        return stringBuilder.ToString();
    }
 
    public static bool IsValidLanguageID(char[] value, int startPos, int length)
    {
        int num = length;
        if (num < 2)
        {
            return false;
        }
        bool flag = false;
        int num2 = startPos;
        char c = value[num2];
        if (XmlCharType.IsLetter(c))
        {
            if (XmlCharType.IsLetter(value[++num2]))
            {
                if (num == 2)
                {
                    return true;
                }
                num--;
                num2++;
            }
            else if ('I' != c && 'i' != c && 'X' != c && 'x' != c)
            {
                return false;
            }
            if (value[num2] != '-')
            {
                return false;
            }
            num -= 2;
            while (num-- > 0)
            {
                c = value[++num2];
                if (XmlCharType.IsLetter(c))
                {
                    flag = true;
                    continue;
                }
                if (c == '-' && flag)
                {
                    flag = false;
                    continue;
                }
                return false;
            }
            if (flag)
            {
                return true;
            }
        }
        return false;
    }
}