/// <summary>
/// Parses the day expression.
/// Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
/// </summary>
/// <returns></returns>
public override Expr Parse()
{
var name = _tokenIt.ExpectId().ToLower();
// 1. Day of week : "monday" or "Monday" etc.
if (_days.ContainsKey(name))
{
return(new ConstantExpr(_days[name]));
}
// 2. DateTime ( today, yesterday, tommorrow )
var dateTime = _dayAliases[name]();
TimeSpan time = TimeSpan.MinValue;
if (_tokenIt.NextToken.Token.Text != "at")
{
return(new ConstantExpr(dateTime));
}
time = TimeExprPlugin.ParseTime(_parser, true, true);
dateTime = new DateTime(dateTime.Year, dateTime.Month, (int)dateTime.Day, time.Hours, time.Minutes, time.Seconds);
return(new ConstantExpr(dateTime));
}
/// <summary>
/// Parses a date.
/// </summary>
/// <param name="parser"></param>
/// <returns></returns>
public static DateTime ParseDate(ILangParser parser)
{
var year = DateTime.Now.Year;
var month = DateTime.Now.Month;
double day = DateTime.Now.Day;
var time = new TimeSpan(0, 0, 0);
var tokenIt = parser.TokenIt;
TokenData n = null;
if (tokenIt.NextToken.Token.Kind == TokenKind.LiteralDate)
{
var parsedDate = (DateTime)tokenIt.NextToken.Token.Value;
year = parsedDate.Year;
month = parsedDate.Month;
day = parsedDate.Day;
}
else
{
// 1. 1st token is definitely month name in long or short form. "oct" or "october".
var monthNameOrAbbr = tokenIt.ExpectId(true, true);
month = _months[monthNameOrAbbr.ToLower()];
// 2. Check for "," after month.
if (tokenIt.NextToken.Token == Tokens.Comma)
{
tokenIt.Advance();
}
// 3. 2nd token is the day 10.
day = tokenIt.ExpectNumber(false);
// 4. Check for "st nd rd th" as in 1st, 2nd, 3rd 4th for the day part.
n = tokenIt.Peek();
var text = n.Token.Text.ToLower();
if (text == "st" || text == "nd" || text == "rd" || text == "th")
{
tokenIt.Advance();
}
// 5. Check for another "," after day part.
n = tokenIt.Peek();
var n2 = tokenIt.Peek(2);
// IMPORTANT: Make sure not to interpret the "," as feb 12, if the the "," is part of a comma in array/map.
if (n.Token == Tokens.Comma && n2.Token.Type == TokenTypes.LiteralNumber)
{
tokenIt.Advance();
}
// 6. Finally check for year
n = tokenIt.Peek();
if (n.Token.Type == TokenTypes.LiteralNumber)
{
year = Convert.ToInt32(n.Token.Text);
tokenIt.Advance();
}
}
// 8. Now check for time.
n = tokenIt.Peek();
if (n.Token.Text == "at")
{
time = TimeExprPlugin.ParseTime(parser, true, true);
}
else
{
tokenIt.Advance();
}
var date = new DateTime(year, month, (int)day, time.Hours, time.Minutes, time.Seconds);
return(date);
}
