+// this function parses a string in (strict) RFC 822 format: see the section 5
+// of the RFC for the detailed description, but briefly it's something of the
+// form "Sat, 18 Dec 1999 00:48:30 +0100"
+//
+// this function is "strict" by design - it must reject anything except true
+// RFC822 time specs.
+//
+// TODO a great candidate for using reg exps
+const wxChar *wxDateTime::ParseRfc822Date(const wxChar* date)
+{
+ wxCHECK_MSG( date, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") );
+
+ const wxChar *p = date;
+ const wxChar *comma = wxStrchr(p, _T(','));
+ if ( comma )
+ {
+ // the part before comma is the weekday
+
+ // skip it for now - we don't use but might check that it really
+ // corresponds to the specfied date
+ p = comma + 1;
+
+ if ( *p != _T(' ') )
+ {
+ wxLogDebug(_T("no space after weekday in RFC822 time spec"));
+
+ return (wxChar *)NULL;
+ }
+
+ p++; // skip space
+ }
+
+ // the following 1 or 2 digits are the day number
+ if ( !wxIsdigit(*p) )
+ {
+ wxLogDebug(_T("day number expected in RFC822 time spec, none found"));
+
+ return (wxChar *)NULL;
+ }
+
+ wxDateTime_t day = *p++ - _T('0');
+ if ( wxIsdigit(*p) )
+ {
+ day *= 10;
+ day += *p++ - _T('0');
+ }
+
+ if ( *p++ != _T(' ') )
+ {
+ return (wxChar *)NULL;
+ }
+
+ // the following 3 letters specify the month
+ wxString monName(p, 3);
+ Month mon;
+ if ( monName == _T("Jan") )
+ mon = Jan;
+ else if ( monName == _T("Feb") )
+ mon = Feb;
+ else if ( monName == _T("Mar") )
+ mon = Mar;
+ else if ( monName == _T("Apr") )
+ mon = Apr;
+ else if ( monName == _T("May") )
+ mon = May;
+ else if ( monName == _T("Jun") )
+ mon = Jun;
+ else if ( monName == _T("Jul") )
+ mon = Jul;
+ else if ( monName == _T("Aug") )
+ mon = Aug;
+ else if ( monName == _T("Sep") )
+ mon = Sep;
+ else if ( monName == _T("Oct") )
+ mon = Oct;
+ else if ( monName == _T("Nov") )
+ mon = Nov;
+ else if ( monName == _T("Dec") )
+ mon = Dec;
+ else
+ {
+ wxLogDebug(_T("Invalid RFC 822 month name '%s'"), monName.c_str());
+
+ return (wxChar *)NULL;
+ }
+
+ p += 3;
+
+ if ( *p++ != _T(' ') )
+ {
+ return (wxChar *)NULL;
+ }
+
+ // next is the year
+ if ( !wxIsdigit(*p) )
+ {
+ // no year?
+ return (wxChar *)NULL;
+ }
+
+ int year = *p++ - _T('0');
+
+ if ( !wxIsdigit(*p) )
+ {
+ // should have at least 2 digits in the year
+ return (wxChar *)NULL;
+ }
+
+ year *= 10;
+ year += *p++ - _T('0');
+
+ // is it a 2 digit year (as per original RFC 822) or a 4 digit one?
+ if ( wxIsdigit(*p) )
+ {
+ year *= 10;
+ year += *p++ - _T('0');
+
+ if ( !wxIsdigit(*p) )
+ {
+ // no 3 digit years please
+ return (wxChar *)NULL;
+ }
+
+ year *= 10;
+ year += *p++ - _T('0');
+ }
+
+ if ( *p++ != _T(' ') )
+ {
+ return (wxChar *)NULL;
+ }
+
+ // time is in the format hh:mm:ss and seconds are optional
+ if ( !wxIsdigit(*p) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ wxDateTime_t hour = *p++ - _T('0');
+
+ if ( !wxIsdigit(*p) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ hour *= 10;
+ hour += *p++ - _T('0');
+
+ if ( *p++ != _T(':') )
+ {
+ return (wxChar *)NULL;
+ }
+
+ if ( !wxIsdigit(*p) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ wxDateTime_t min = *p++ - _T('0');
+
+ if ( !wxIsdigit(*p) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ min *= 10;
+ min += *p++ - _T('0');
+
+ wxDateTime_t sec = 0;
+ if ( *p++ == _T(':') )
+ {
+ if ( !wxIsdigit(*p) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ sec = *p++ - _T('0');
+
+ if ( !wxIsdigit(*p) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ sec *= 10;
+ sec += *p++ - _T('0');
+ }
+
+ if ( *p++ != _T(' ') )
+ {
+ return (wxChar *)NULL;
+ }
+
+ // and now the interesting part: the timezone
+ int offset;
+ if ( *p == _T('-') || *p == _T('+') )
+ {
+ // the explicit offset given: it has the form of hhmm
+ bool plus = *p++ == _T('+');
+
+ if ( !wxIsdigit(*p) || !wxIsdigit(*(p + 1)) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ // hours
+ offset = 60*(10*(*p - _T('0')) + (*(p + 1) - _T('0')));
+
+ p += 2;
+
+ if ( !wxIsdigit(*p) || !wxIsdigit(*(p + 1)) )
+ {
+ return (wxChar *)NULL;
+ }
+
+ // minutes
+ offset += 10*(*p - _T('0')) + (*(p + 1) - _T('0'));
+
+ if ( !plus )
+ {
+ offset = -offset;
+ }
+
+ p += 2;
+ }
+ else
+ {
+ // the symbolic timezone given: may be either military timezone or one
+ // of standard abbreviations
+ if ( !*(p + 1) )
+ {
+ // military: Z = UTC, J unused, A = -1, ..., Y = +12
+ static const int offsets[26] =
+ {
+ //A B C D E F G H I J K L M
+ -1, -2, -3, -4, -5, -6, -7, -8, -9, 0, -10, -11, -12,
+ //N O P R Q S T U V W Z Y Z
+ +1, +2, +3, +4, +5, +6, +7, +8, +9, +10, +11, +12, 0
+ };
+
+ if ( *p < _T('A') || *p > _T('Z') || *p == _T('J') )
+ {
+ wxLogDebug(_T("Invalid militaty timezone '%c'"), *p);
+
+ return (wxChar *)NULL;
+ }
+
+ offset = offsets[*p++ - _T('A')];
+ }
+ else
+ {
+ // abbreviation
+ wxString tz = p;
+ if ( tz == _T("UT") || tz == _T("UTC") || tz == _T("GMT") )
+ offset = 0;
+ else if ( tz == _T("AST") )
+ offset = AST - GMT0;
+ else if ( tz == _T("ADT") )
+ offset = ADT - GMT0;
+ else if ( tz == _T("EST") )
+ offset = EST - GMT0;
+ else if ( tz == _T("EDT") )
+ offset = EDT - GMT0;
+ else if ( tz == _T("CST") )
+ offset = CST - GMT0;
+ else if ( tz == _T("CDT") )
+ offset = CDT - GMT0;
+ else if ( tz == _T("MST") )
+ offset = MST - GMT0;
+ else if ( tz == _T("MDT") )
+ offset = MDT - GMT0;
+ else if ( tz == _T("PST") )
+ offset = PST - GMT0;
+ else if ( tz == _T("PDT") )
+ offset = PDT - GMT0;
+ else
+ {
+ wxLogDebug(_T("Unknown RFC 822 timezone '%s'"), p);
+
+ return (wxChar *)NULL;
+ }
+
+ p += tz.length();
+ }
+
+ // make it minutes
+ offset *= 60;
+ }
+
+ // the spec was correct
+ Set(day, mon, year, hour, min, sec);
+ MakeTimezone(60*offset);
+
+ return p;
+}
+
+const wxChar *wxDateTime::ParseFormat(const wxChar *date, const wxChar *format)
+{
+ wxCHECK_MSG( date && format, (wxChar *)NULL,
+ _T("NULL pointer in wxDateTime::Parse") );
+
+ // there is a public domain version of getdate.y, but it only works for
+ // English...
+ wxFAIL_MSG(_T("TODO"));
+
+ return (wxChar *)NULL;
+}
+
+const wxChar *wxDateTime::ParseDateTime(const wxChar *date)
+{
+ wxCHECK_MSG( date, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") );
+
+ // find a public domain version of strptime() somewhere?
+ wxFAIL_MSG(_T("TODO"));
+
+ return (wxChar *)NULL;
+}
+
+const wxChar *wxDateTime::ParseDate(const wxChar *date)
+{
+ // this is a simplified version of ParseDateTime() which understands only
+ // "today" (for wxDate compatibility) and digits only otherwise (and not
+ // all esoteric constructions ParseDateTime() knows about)
+
+ wxCHECK_MSG( date, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") );
+
+ const wxChar *p = date;
+ while ( wxIsspace(*p) )
+ p++;
+
+ wxString today = _T("today");
+ size_t len = today.length();
+ if ( wxString(p, len).CmpNoCase(today) == 0 )
+ {
+ // nothing can follow this, so stop here
+ p += len;
+
+ *this = Today();
+
+ return p;
+ }
+
+ // what do we have?
+ bool haveDay = FALSE, // the months day?
+ haveWDay = FALSE, // the day of week?
+ haveMon = FALSE, // the month?
+ haveYear = FALSE; // the year?
+
+ // and the value of the items we have (init them to get rid of warnings)
+ WeekDay wday = Inv_WeekDay;
+ wxDateTime_t day = 0;
+ wxDateTime::Month mon = Inv_Month;
+ int year = 0;
+
+ // tokenize the string
+ wxStringTokenizer tok(p, _T(",/-\t "));
+ while ( tok.HasMoreTokens() )
+ {
+ wxString token = tok.GetNextToken();
+
+ // is it a number?
+ unsigned long val;
+ if ( token.ToULong(&val) )
+ {
+ // guess what this number is
+
+ bool isDay = FALSE,
+ isMonth = FALSE,
+ // only years are counted from 0
+ isYear = (val == 0) || (val > 31);
+ if ( !isYear )
+ {
+ // may be the month or month day or the year, assume the
+ // month day by default and fallback to month if the range
+ // allow it or to the year if our assumption doesn't work
+ if ( haveDay )
+ {
+ // we already have the day, so may only be a month or year
+ if ( val > 12 )
+ {
+ isYear = TRUE;
+ }
+ else
+ {
+ isMonth = TRUE;
+ }
+ }
+ else // it may be day
+ {
+ isDay = TRUE;
+
+ // check the range
+ if ( haveMon )
+ {
+ if ( val > GetNumOfDaysInMonth(haveYear ? year
+ : Inv_Year,
+ mon) )
+ {
+ // oops, it can't be a day finally
+ isDay = FALSE;
+
+ if ( val > 12 )
+ {
+ isYear = TRUE;
+ }
+ else
+ {
+ isMonth = TRUE;
+ }
+ }
+ }
+ }
+ }
+
+ // remember that we have this and stop the scan if it's the second
+ // time we find this, except for the day logic (see there)
+ if ( isYear )
+ {
+ if ( haveYear )
+ {
+ break;
+ }
+
+ haveYear = TRUE;
+
+ // no roll over - 99 means 99, not 1999 for us
+ year = val;
+ }
+ else if ( isMonth )
+ {
+ if ( haveMon )
+ {
+ break;
+ }
+
+ haveMon = TRUE;
+
+ mon = (wxDateTime::Month)val;
+ }
+ else
+ {
+ wxASSERT_MSG( isDay, _T("logic error") );
+
+ if ( haveDay )
+ {
+ // may be were mistaken when we found it for the first
+ // time? may be it was a month or year instead?
+ //
+ // this ability to "backtrack" allows us to correctly parse
+ // both things like 01/13 and 13/01 - but, of course, we
+ // still can't resolve the ambiguity in 01/02 (it will be
+ // Feb 1 for us, not Jan 2 as americans might expect!)
+ if ( (day <= 12) && !haveMon )
+ {
+ // exchange day and month
+ mon = (wxDateTime::Month)day;
+
+ haveMon = TRUE;
+ }
+ else if ( !haveYear )
+ {
+ // exchange day and year
+ year = day;
+
+ haveYear = TRUE;
+ }
+ }
+
+ haveDay = TRUE;
+
+ day = val;
+ }
+ }
+ else // not a number
+ {
+ mon = GetMonthFromName(token);
+ if ( mon != Inv_Month )
+ {
+ // it's a month
+ if ( haveMon )
+ {
+ break;
+ }
+
+ haveMon = TRUE;
+ }
+ else
+ {
+ wday = GetWeekDayFromName(token);
+ if ( wday != Inv_WeekDay )
+ {
+ // a week day
+ if ( haveWDay )
+ {
+ break;
+ }
+
+ haveWDay = TRUE;
+ }
+ else
+ {
+ // try the ordinals
+ static const wxChar *ordinals[] =
+ {
+ wxTRANSLATE("first"),
+ wxTRANSLATE("second"),
+ wxTRANSLATE("third"),
+ wxTRANSLATE("fourth"),
+ wxTRANSLATE("fifth"),
+ wxTRANSLATE("sixth"),
+ wxTRANSLATE("seventh"),
+ wxTRANSLATE("eighth"),
+ wxTRANSLATE("ninth"),
+ wxTRANSLATE("tenth"),
+ wxTRANSLATE("eleventh"),
+ wxTRANSLATE("twelfth"),
+ wxTRANSLATE("thirteenth"),
+ wxTRANSLATE("fourteenth"),
+ wxTRANSLATE("fifteenth"),
+ wxTRANSLATE("sixteenth"),
+ wxTRANSLATE("seventeenth"),
+ wxTRANSLATE("eighteenth"),
+ wxTRANSLATE("nineteenth"),
+ wxTRANSLATE("twentieth"),
+ // that's enough - otherwise we'd have problems with
+ // composite (or not) ordinals otherwise
+ };
+
+ size_t n;
+ for ( n = 0; n < WXSIZEOF(ordinals); n++ )
+ {
+ if ( token.CmpNoCase(ordinals[n]) == 0 )
+ {
+ break;
+ }
+ }
+
+ if ( n == WXSIZEOF(ordinals) )
+ {
+ // stop here - something unknown
+ break;
+ }
+
+ // it's a day
+ if ( haveDay )
+ {
+ // don't try anything here (as in case of numeric day
+ // above) - the symbolic day spec should always
+ // precede the month/year
+ break;
+ }
+
+ haveDay = TRUE;
+
+ day = n + 1;
+ }
+ }
+ }
+ }
+
+ // either no more tokens or the scan was stopped by something we couldn't
+ // parse - in any case, see if we can construct a date from what we have
+ if ( !haveDay && !haveWDay )
+ {
+ wxLogDebug(_T("no day, no weekday hence no date."));
+
+ return (wxChar *)NULL;
+ }
+
+ if ( haveWDay && (haveMon || haveYear || haveDay) &&
+ !(haveMon && haveMon && haveYear) )
+ {
+ // without adjectives (which we don't support here) the week day only
+ // makes sense completely separately or with the full date
+ // specification (what would "Wed 1999" mean?)
+ return (wxChar *)NULL;
+ }
+
+ if ( !haveMon )
+ {
+ mon = GetCurrentMonth();
+ }
+
+ if ( !haveYear )
+ {
+ year = GetCurrentYear();
+ }
+
+ if ( haveDay )
+ {
+ Set(day, mon, year);
+
+ if ( haveWDay )
+ {
+ // check that it is really the same
+ if ( GetWeekDay() != wday )
+ {
+ // inconsistency detected
+ return (wxChar *)NULL;
+ }
+ }
+ }
+ else // haveWDay
+ {
+ *this = Today();
+
+ SetToWeekDayInSameWeek(wday);
+ }
+
+ // return the pointer to the next char
+ return p + wxStrlen(p) - wxStrlen(tok.GetString());
+}
+
+const wxChar *wxDateTime::ParseTime(const wxChar *time)
+{
+ wxCHECK_MSG( time, (wxChar *)NULL, _T("NULL pointer in wxDateTime::Parse") );
+
+ // this function should be able to parse different time formats as well as
+ // timezones (take the code out from ParseRfc822Date()) and AM/PM.
+ wxFAIL_MSG(_T("TODO"));
+
+ return (wxChar *)NULL;
+}
+
projects / wxWidgets.git / commitdiff
