/// <summary>
/// Trims the start of the given string, but makes sure the _charIndex and _lineIndex
/// members are adapted suitably.
/// </summary>
/// <param name="source">String to trim. Must not be null.</param>
private void TrimStart(ref string source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
var match = Regex.Match(source, @"^(\s+)");
if (match.Captures.Count > 0)
{
var wsString = match.Captures[0].Value;
// correct line count
var nlCount = wsString.Count(c => c == '\n'); // TODO win/lin correct? Env.NL is a String...
_scannerState.AdvanceLineIndex(nlCount);
if (nlCount > 0)
{
_scannerState.CharIndex = 0;
}
// correct char count in one line
int lioNewLine = wsString.LastIndexOf(Environment.NewLine, StringComparison.Ordinal);
if (lioNewLine >= 0)
{
var lastWS = wsString.Substring(lioNewLine + Environment.NewLine.Length);
var count = lastWS.Length;
_scannerState.AdvanceCharIndex(count);
}
else
{
_scannerState.AdvanceCharIndex(wsString.Length);
}
source = source.Substring(wsString.Length);
}
}
