internal static Utf16FormatSegment[] Utf16Parse(string format)
{
if (format == null)
{
throw new ArgumentNullException(nameof(format));
}
var list = new List <Utf16FormatSegment>();
int i = 0;
int len = format.Length;
var copyFrom = 0;
while (true)
{
while (i < len)
{
var parserScanResult = FormatParser.ScanFormatString(format, ref i);
if (ParserScanResult.NormalChar == parserScanResult && i < len)
{
// skip normal char
continue;
}
var size = i - copyFrom;
if (ParserScanResult.EscapedChar == parserScanResult)
{
size--;
}
if (size != 0)
{
list.Add(new Utf16FormatSegment(copyFrom, size, Utf16FormatSegment.NotFormatIndex, 0));
}
copyFrom = i;
if (ParserScanResult.BraceOpen == parserScanResult)
{
break;
}
}
if (i >= len)
{
break;
}
// Here it is before `{`.
var indexParse = FormatParser.Parse(format, i);
copyFrom = indexParse.LastIndex; // continue after '}'
i = indexParse.LastIndex;
list.Add(new Utf16FormatSegment(indexParse.LastIndex - indexParse.FormatString.Length - 1, indexParse.FormatString.Length, indexParse.Index, indexParse.Alignment));
}
return(list.ToArray());
}
internal static FormatSegment[] Parse(string format, bool withStandardFormat)
{
var list = new List <FormatSegment>();
var copyFrom = 0;
for (int i = 0; i < format.Length; i++)
{
if (format[i] == '{')
{
// escape.
if (i == format.Length - 1)
{
throw new FormatException("invalid format");
}
if (i != format.Length && format[i + 1] == '{')
{
var size = i - copyFrom;
if (size != 0)
{
list.Add(new FormatSegment(copyFrom, size, false, 0, null, withStandardFormat));
}
i = i + 1; // skip escaped '{'
copyFrom = i;
continue;
}
else
{
var size = i - copyFrom;
if (size != 0)
{
list.Add(new FormatSegment(copyFrom, size, false, 0, null, withStandardFormat));
}
}
// try to find range
var indexParse = FormatParser.Parse(format.AsSpan(i));
list.Add(new FormatSegment(0, 0, true, indexParse.Index, indexParse.FormatString.ToString(), withStandardFormat));
copyFrom = i + indexParse.LastIndex + 1;
i = i + indexParse.LastIndex;
}
else if (format[i] == '}')
{
if (i != format.Length && format[i + 1] == '}')
{
var size = i - copyFrom;
if (size != 0)
{
list.Add(new FormatSegment(copyFrom, size, false, 0, null, withStandardFormat));
}
i = i + 1; // skip escaped '}'
copyFrom = i;
continue;
}
}
}
{
// final string
var copyLength = format.Length - copyFrom;
if (copyLength > 0)
{
list.Add(new FormatSegment(copyFrom, copyLength, false, 0, null, withStandardFormat));
}
}
return(list.ToArray());
}