public StatementParser(ILangParser parent)
: base(parent)
{
}
/// <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);
}
public MethodParser(ILangParser parser)
: base(parser)
{
}
/// <summary>
/// Parses the time in format 12[:minutes:seconds] am|pm.
/// </summary>
/// <param name="parser"></param>
/// <param name="advance"></param>
/// <param name="expectAt"></param>
/// <returns></returns>
public static TimeSpan ParseTime(ILangParser parser, bool advance, bool expectAt)
{
double minutes = 0;
double seconds = 0;
double hours = DateTime.Now.Hour;
var tokenIt = parser.TokenIt;
if(advance) tokenIt.Advance();
if (expectAt)
{
// 1. Expect 'at"
tokenIt.ExpectIdText("at", true);
}
// Next token could be a Literal time token
// 1. time is a basic datatype
// 2. time could be represented as 9:30 am and could have been
// lexically parsed by a lex plugin.
// NOTE: This plugin(any all other plugins) should NOT
// know or depend on any other plugin.
// However, they can know about tokens / basic types.
if (tokenIt.NextToken.Token.Kind == TokenKind.LiteralTime)
{
var timeVal = (TimeSpan)tokenIt.NextToken.Token.Value;
tokenIt.Advance();
return timeVal;
}
string tokenText = tokenIt.NextToken.Token.Text.ToLower();
if (_aliases.ContainsKey(tokenText))
{
tokenIt.Advance();
return _aliases[tokenText];
}
// 3. Hour part
hours = tokenIt.ExpectNumber(true);
// 4. Time specified without colon: e.g. 1030 pm ?
var next = tokenIt.NextToken.Token.Text;
if ((next == "am" || next == "pm") && tokenText.Length > 2)
{
var time = hours;
// 130 - 930 am|pm
if (time < 1000)
{
hours = Convert.ToDouble(tokenText[0].ToString());
minutes = Convert.ToDouble(tokenText.Substring(1));
}
// 1030 - 1230 am|pm
else
{
hours = Convert.ToDouble(tokenText.Substring(0, 2));
minutes = Convert.ToDouble(tokenText.Substring(2));
}
}
// 5. Time specified with ":" 10:30 pm
else if (next == ":")
{
tokenIt.Advance();
// 6. Minutes part.
minutes = tokenIt.ExpectNumber(true);
if (tokenIt.NextToken.Token == Tokens.Colon)
{
tokenIt.Advance();
seconds = tokenIt.ExpectNumber(true);
}
}
var text = tokenIt.NextToken.Token.Text;
if (text != "am" && text != "pm")
throw tokenIt.BuildSyntaxExpectedException("am/pm");
if (text == "pm" && hours >= 1 && hours <= 11)
hours += 12;
tokenIt.Advance();
return new TimeSpan((int)hours, (int)minutes, (int)seconds);
}
/// <summary>
/// Parses the time in format 12[:minutes:seconds] am|pm.
/// </summary>
/// <param name="parser"></param>
/// <param name="advance"></param>
/// <param name="expectAt"></param>
/// <returns></returns>
public static TimeSpan ParseTime(ILangParser parser, bool advance, bool expectAt)
{
double minutes = 0;
double seconds = 0;
double hours = DateTime.Now.Hour;
var tokenIt = parser.TokenIt;
if (advance)
{
tokenIt.Advance();
}
if (expectAt)
{
// 1. Expect 'at"
tokenIt.ExpectIdText("at", true);
}
// Next token could be a Literal time token
// 1. time is a basic datatype
// 2. time could be represented as 9:30 am and could have been
// lexically parsed by a lex plugin.
// NOTE: This plugin(any all other plugins) should NOT
// know or depend on any other plugin.
// However, they can know about tokens / basic types.
if (tokenIt.NextToken.Token.Kind == TokenKind.LiteralTime)
{
var timeVal = (TimeSpan)tokenIt.NextToken.Token.Value;
tokenIt.Advance();
return(timeVal);
}
string tokenText = tokenIt.NextToken.Token.Text.ToLower();
if (_aliases.ContainsKey(tokenText))
{
tokenIt.Advance();
return(_aliases[tokenText]);
}
// 3. Hour part
hours = tokenIt.ExpectNumber(true);
// 4. Time specified without colon: e.g. 1030 pm ?
var next = tokenIt.NextToken.Token.Text;
if ((next == "am" || next == "pm") && tokenText.Length > 2)
{
var time = hours;
// 130 - 930 am|pm
if (time < 1000)
{
hours = Convert.ToDouble(tokenText[0].ToString());
minutes = Convert.ToDouble(tokenText.Substring(1));
}
// 1030 - 1230 am|pm
else
{
hours = Convert.ToDouble(tokenText.Substring(0, 2));
minutes = Convert.ToDouble(tokenText.Substring(2));
}
}
// 5. Time specified with ":" 10:30 pm
else if (next == ":")
{
tokenIt.Advance();
// 6. Minutes part.
minutes = tokenIt.ExpectNumber(true);
if (tokenIt.NextToken.Token == Tokens.Colon)
{
tokenIt.Advance();
seconds = tokenIt.ExpectNumber(true);
}
}
var text = tokenIt.NextToken.Token.Text;
if (text != "am" && text != "pm")
{
throw tokenIt.BuildSyntaxExpectedException("am/pm");
}
if (text == "pm" && hours >= 1 && hours <= 11)
{
hours += 12;
}
tokenIt.Advance();
return(new TimeSpan((int)hours, (int)minutes, (int)seconds));
}
public AssignmentParser(ILangParser parser)
: base(parser)
{
}
/// <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;
}
