/// <summary>
/// Whether or not this uri plugin can handle the current token.
/// </summary>
/// <param name="current"></param>
/// <returns></returns>
public override bool CanHandle(Token current)
{
_time = TimeSpan.MinValue;
_endPos = -1;
// Case 1: noon, "afternoon, midnight
if (_aliases.ContainsKey(current.Text))
{
_time = CloneTime(_aliases[current.Text]);
return(true);
}
// Check 1: Make sure it's a number.
if (current.Kind != TokenKind.LiteralNumber)
{
return(false);
}
var nextToken = _lexer.PeekToken();
var nextTokenText = nextToken.Token.Text.ToLower();
// Check 2: End token?
if (nextToken.Token == ComLib.Lang.Core.Tokens.EndToken)
{
return(false);
}
// Check 3: Time format is 9:30 am or 930 am
// So if next token is not ':' then it has to be "am" or "pm"
if (nextTokenText != ComLib.Lang.Core.Tokens.Colon.Text &&
nextTokenText != "am" && nextTokenText != "pm")
{
return(false);
}
var text = Lexer.State.CurrentChar + _lexer.Scanner.PeekMaxChars(10);
// 1. Check for am/pm ( required )
var isAm = true;
var ndxAmOrPm = text.IndexOf("am", StringComparison.InvariantCultureIgnoreCase);
if (ndxAmOrPm == -1)
{
ndxAmOrPm = text.IndexOf("pm", StringComparison.InvariantCultureIgnoreCase);
if (ndxAmOrPm > -1)
{
isAm = false;
}
}
// Case 3: No am/pm designator so not applicable
if (ndxAmOrPm == -1)
{
return(false);
}
// Case 4: 830pm
if (text.IndexOf(":") < 0)
{
text = current.Text + text.Substring(0, ndxAmOrPm + 2);
_time = DateTimeTypeHelper.ParseTimeWithoutColons(current.Text, isAm);
_endPos = _lexer.State.Pos + ndxAmOrPm + 1;
return(true);
}
// Note: the longest time string can only be 9 chars e.g. :30:45 am
text = current.Text + text.Substring(0, ndxAmOrPm + 2);
var result = DateTimeTypeHelper.ParseTime(text);
// Was not a valid time string. maybe some other plguin can handle it.
if (!result.Item2)
{
return(false);
}
_endPos = _lexer.State.Pos + ndxAmOrPm + 1;
_time = result.Item1;
return(true);
}
