private static string FormatMessage(TokenType[] tokenTypes, int offset)
{
if (tokenTypes.Length == 0)
{
return string.Format("Expected (unkonwn) at character {0}.", offset);
}
if (tokenTypes.Length == 1)
{
return string.Format("Expected {0} at character {1}.", tokenTypes[0], offset);
}
var tokenTypeList = string.Join(", ", tokenTypes.Take(tokenTypes.Length - 1).Select(t => t.ToString())) + " or " + tokenTypes[tokenTypes.Length - 1];
return string.Format("Expected {0} at character {1}.", tokenTypeList, offset);
}