public unsafe static int StringToInt(string value, int fromBase, int flags, int *parsePos)
{
if ((flags & (IsTight | NoSpace)) == 0)
{
throw new NotImplementedException(flags.ToString());
}
if (value == null)
{
return(0);
}
int chars = 0;
uint result = 0;
int digitValue;
int len = value.Length;
bool negative = false;
if (len == 0)
{
// Mimic broken .net behaviour
throw new ArgumentOutOfRangeException("Empty string");
}
int i = parsePos == null ? 0 : *parsePos;
//Check for a sign
if (value [i] == '-')
{
if (fromBase != 10)
{
throw new ArgumentException("String cannot contain a minus sign if the base is not 10.");
}
if ((flags & TreatAsUnsigned) != 0)
{
throw new OverflowException("Negative number");
}
negative = true;
i++;
}
else if (value [i] == '+')
{
i++;
}
if (fromBase == 16 && i + 1 < len && value [i] == '0' && (value [i + 1] == 'x' || value [i + 1] == 'X'))
{
i += 2;
}
uint max_value;
if ((flags & TreatAsI1) != 0)
{
max_value = Byte.MaxValue;
}
else if ((flags & TreatAsI2) != 0)
{
max_value = UInt16.MaxValue;
}
else
{
max_value = UInt32.MaxValue;
}
while (i < len)
{
char c = value [i];
if (Char.IsNumber(c))
{
digitValue = c - '0';
}
else if (Char.IsLetter(c))
{
digitValue = Char.ToLowerInvariant(c) - 'a' + 10;
}
else
{
if (i == 0)
{
throw new FormatException("Could not find any parsable digits.");
}
if ((flags & IsTight) != 0)
{
throw new FormatException("Additional unparsable characters are at the end of the string.");
}
break;
}
if (digitValue >= fromBase)
{
if (chars > 0)
{
throw new FormatException("Additional unparsable characters are at the end of the string.");
}
throw new FormatException("Could not find any parsable digits.");
}
var res = (uint)fromBase * result + (uint)digitValue;
if (res < result || res > max_value)
{
throw new OverflowException();
}
result = res;
chars++;
++i;
}
if (chars == 0)
{
throw new FormatException("Could not find any parsable digits.");
}
if (parsePos != null)
{
*parsePos = i;
}
return(negative ? -(int)result : (int)result);
}
public static char ToUpperInvariant(this char c)
{
return(Char.ToLowerInvariant(c));
}
public unsafe static long StringToLong(string value, int fromBase, int flags, int *parsePos)
{
if ((flags & (IsTight | NoSpace)) == 0)
{
throw new NotImplementedException(flags.ToString());
}
if (value == null)
{
return(0);
}
int chars = 0;
ulong fromBaseULong = (ulong)fromBase;
ulong digitValue = 0;
ulong result = 0;
int len = value.Length;
bool negative = false;
bool treatAsUnsigned = (flags & ParseNumbers.TreatAsUnsigned) != 0;
if (len == 0)
{
// Mimic broken .net behaviour
throw new ArgumentOutOfRangeException("Empty string");
}
int i = parsePos == null ? 0 : *parsePos;
//Check for a sign
if (value [i] == '-')
{
if (fromBase != 10)
{
throw new ArgumentException("String cannot contain a minus sign if the base is not 10.");
}
if (treatAsUnsigned)
{
throw new OverflowException("Negative number");
}
negative = true;
i++;
}
else if (value [i] == '+')
{
i++;
}
if (fromBase == 16 && i + 1 < len && value [i] == '0' && (value [i + 1] == 'x' || value [i + 1] == 'X'))
{
i += 2;
}
while (i < len)
{
char c = value[i];
if (Char.IsNumber(c))
{
digitValue = (ulong)(c - '0');
}
else if (Char.IsLetter(c))
{
digitValue = (ulong)(Char.ToLowerInvariant(c) - 'a' + 10);
}
else
{
if (i == 0)
{
throw new FormatException("Could not find any parsable digits.");
}
if ((flags & IsTight) != 0)
{
throw new FormatException("Additional unparsable characters are at the end of the string.");
}
break;
}
if (digitValue >= fromBaseULong)
{
if (chars > 0)
{
throw new FormatException("Additional unparsable "
+ "characters are at the end of the string.");
}
else
{
throw new FormatException("Could not find any parsable"
+ " digits.");
}
}
if (result <= base16MaxOverflowFreeValue)
{
result = result * (ulong)fromBaseULong + digitValue;
}
else
{
// decompose 64 bit operation into 32 bit operations so we can check for overflows
ulong a = (result >> 32) * fromBaseULong;
ulong b = (result & uint.MaxValue) * fromBaseULong + digitValue;
if (((b >> 32) + a) > uint.MaxValue)
{
throw new OverflowException();
}
result = (a << 32) + b;
}
chars++;
++i;
}
if (chars == 0)
{
throw new FormatException("Could not find any parsable digits.");
}
if (parsePos != null)
{
*parsePos = i;
}
if (treatAsUnsigned)
{
return((long)result);
}
if (!negative)
{
if (fromBase == 10 && result > ((ulong)long.MaxValue))
{
throw new OverflowException();
}
return((long)result);
}
if (result <= (ulong)long.MaxValue)
{
return(-((long)result));
}
if (result > longMinValue)
{
throw new OverflowException();
}
// Avoids overflow of -result when result > long.MaxValue
return(long.MinValue + (long)(longMinValue - result));
}
/// <summary> /// Converts the specified string to camel case (except for words that are entirely in uppercase, which are considered to be acronyms). /// </summary> /// <param name="String">The string to convert to camel case.</param> /// <returns>The specified string converted to camel case</returns> public static String ToCamelCase(this String String) => Char.ToLowerInvariant(String[0]) + String.ToPascalCase().Substring(1);
public static string LowerFirstChar(this string name)
{
return(Char.ToLowerInvariant(name[0]) + name.Substring(1));
}
public static Char ToLowerInvariant(this Char c)
{
return(Char.ToLowerInvariant(c));
}
/// <summary> /// Converts the value of a Unicode character to its lowercase equivalent using the casing rules of the invariant culture. /// </summary> /// <param name="char">The Unicode character to convert.</param> /// <returns>The lowercase equivalent of the <paramref name="char"/> parameter, or the unchanged value of <paramref name="char"/>, if <paramref name="char"/> is already lowercase or not alphabetic.</returns> public static Char ToLowerInvariant(this Char @char) => Char.ToLowerInvariant(@char);
public static long StringToLong(string value, int fromBase, int flags)
{
if ((flags & IsTight) == 0)
{
throw new NotImplementedException();
}
if (value == null)
{
return(0);
}
int chars = 0;
int digitValue = -1;
long result = 0;
int i = 0;
int len = value.Length;
bool negative = false;
if (len == 0)
{
// Mimic broken .net behaviour
throw new ArgumentOutOfRangeException("Empty string");
}
//Check for a sign
if (value [i] == '-')
{
if (fromBase != 10)
{
throw new ArgumentException("String cannot contain a minus sign if the base is not 10.");
}
if ((flags & TreatAsUnsigned) != 0)
{
throw new OverflowException("Negative number");
}
negative = true;
i++;
}
else if (value [i] == '+')
{
i++;
}
if (fromBase == 16 && i + 1 < len && value [i] == '0' && (value [i + 1] == 'x' || value [i + 1] == 'X'))
{
i += 2;
}
while (i < len)
{
char c = value[i++];
if (Char.IsNumber(c))
{
digitValue = c - '0';
}
else if (Char.IsLetter(c))
{
digitValue = Char.ToLowerInvariant(c) - 'a' + 10;
}
else
{
if (chars > 0)
{
throw new FormatException("Additional unparsable "
+ "characters are at the end of the string.");
}
else
{
throw new FormatException("Could not find any parsable"
+ " digits.");
}
}
if (digitValue >= fromBase)
{
if (chars > 0)
{
throw new FormatException("Additional unparsable "
+ "characters are at the end of the string.");
}
else
{
throw new FormatException("Could not find any parsable"
+ " digits.");
}
}
result = fromBase * result + digitValue;
chars++;
}
if (chars == 0)
{
throw new FormatException("Could not find any parsable digits.");
}
return(negative ? -result : result);
}