102 lines
2.2 KiB
C#
102 lines
2.2 KiB
C#
using System.Globalization;
|
|
|
|
namespace System.Windows
|
|
{
|
|
/// <summary>
|
|
/// Helper class for parsing serialized data structures from the System.Windows namespace.
|
|
/// </summary>
|
|
internal class NumericListTokenizer
|
|
{
|
|
private readonly string _str;
|
|
private readonly char _separator;
|
|
private int _position;
|
|
|
|
private enum Symbol
|
|
{
|
|
Token,
|
|
Separator,
|
|
Whitspace,
|
|
EndOfLine
|
|
}
|
|
|
|
public NumericListTokenizer (string str, IFormatProvider formatProvider)
|
|
{
|
|
_str = str ?? throw new ArgumentNullException (nameof(str));
|
|
_separator = GetSeparator (formatProvider ?? throw new ArgumentNullException (nameof(formatProvider)));
|
|
}
|
|
|
|
public static char GetSeparator (IFormatProvider formatProvider)
|
|
{
|
|
// By convention, string representations of target classes always use ';' as a separator
|
|
// if the decimal number separator is ','. Otherwise, the separator is ','.
|
|
return NumberFormatInfo.GetInstance (formatProvider).NumberDecimalSeparator != "," ? ',' : ';';
|
|
}
|
|
|
|
private Symbol GetCurrentSymbol ()
|
|
{
|
|
if (_position >= _str.Length)
|
|
return Symbol.EndOfLine;
|
|
if (_str[_position] == _separator)
|
|
return Symbol.Separator;
|
|
if (char.IsWhiteSpace (_str, _position))
|
|
return Symbol.Whitspace;
|
|
return Symbol.Token;
|
|
}
|
|
|
|
private void SkipAllWhitespaces ()
|
|
{
|
|
while (GetCurrentSymbol () == Symbol.Whitspace)
|
|
{
|
|
_position++;
|
|
}
|
|
}
|
|
|
|
private void SkipNextDelimeter ()
|
|
{
|
|
SkipAllWhitespaces ();
|
|
switch (GetCurrentSymbol ())
|
|
{
|
|
case Symbol.Token:
|
|
return;
|
|
case Symbol.Separator:
|
|
_position++;
|
|
SkipAllWhitespaces ();
|
|
return;
|
|
default:
|
|
throw new InvalidOperationException ("Separator not found");
|
|
}
|
|
}
|
|
|
|
public bool HasNoMoreTokens ()
|
|
{
|
|
SkipAllWhitespaces ();
|
|
return GetCurrentSymbol () == Symbol.EndOfLine;
|
|
}
|
|
|
|
public string GetNextToken ()
|
|
{
|
|
var length = 0;
|
|
if (_position == 0)
|
|
{
|
|
SkipAllWhitespaces ();
|
|
}
|
|
else
|
|
{
|
|
SkipNextDelimeter ();
|
|
}
|
|
|
|
while (GetCurrentSymbol () == Symbol.Token)
|
|
{
|
|
_position++;
|
|
length++;
|
|
}
|
|
|
|
if (length == 0)
|
|
{
|
|
throw new InvalidOperationException ("Next token not found");
|
|
}
|
|
|
|
return _str.Substring (_position - length, length);
|
|
}
|
|
}
|
|
} |