private void Parse()
{
int idx = 0;
StringBuilder text = new StringBuilder();
while (idx < _messageFormat.Length)
{
char c = _messageFormat[idx];
if (c == '{')
{
if (PeekChar(idx) != '{')
{
// a hole starts -> save text before and parse hole
if (text.Length > 0)
{
_token.Add(new MessageTextToken(text.ToString()));
text.Clear();
}
MessageHoleToken hole = ParseHole(ref idx);
_token.Add(hole);
}
else
{
// escaped {
text.Append(c);
idx += 2;
}
}
else if (c == '}' && PeekChar(idx) == '}')
{
// escaped }
text.Append(c);
idx += 2;
}
else
{
text.Append(c);
idx++;
}
}
if (text.Length > 0)
{
_token.Add(new MessageTextToken(text.ToString()));
}
}
private string FormatPositional(List <object> values)
{
var format = new StringBuilder(_messageFormat.Length + 128);
foreach (var token in _token)
{
var text = token switch
{
MessageTextToken textToken => textToken.Text,
MessageHoleToken holeToken => FormatHole(holeToken, holeToken.Index.Filter(x => values.Count > x).Match(x => values[x], () => "?")),
_ => throw new NotImplementedException(),
};
format.Append(text);
}
return(format.ToString());
}
private string FormatNamed(IEnumerable <object> values)
{
var format = new StringBuilder(_messageFormat.Length + 128);
IEnumerator <object> valuesEnumerator = values.GetEnumerator();
foreach (var token in _token)
{
var text = token switch
{
MessageTextToken textToken => textToken.Text,
MessageHoleToken holeToken => FormatHole(holeToken, valuesEnumerator.MoveNext() ? valuesEnumerator.Current : "?"),
_ => throw new NotImplementedException(),
};
format.Append(text);
}
return(format.ToString());
}
private string FormatHole(MessageHoleToken holeToken, object value)
{
return(string.Format($"{{0,{holeToken.Alignment}:{holeToken.Format}}}", value));
}