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/usr/share/syncevolution/xml/scripting/11calendar.xml is in syncevolution-common 1.2.2-1.

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    <!-- define script macros for scripts that are used by both vCalendar 1.0 and iCalendar 2.0 -->

    <macro name="VCALENDAR_INCOMING_SCRIPT"><![CDATA[
      STRING MATCHES[];
      STRING CAT,CN,EM;
      INTEGER i;
      // make sure we have all trailing and leading spaces eliminated
      DESCRIPTION=NORMALIZED(DESCRIPTION);
      SUMMARY=NORMALIZED(SUMMARY);
      // eliminate description that is the same as summary
      if (DESCRIPTION==SUMMARY) DESCRIPTION=EMPTY;
      // calendar or todo
      if (ISEVENT) {
        // VEVENT
        // - handle duration cases
        if (ISDURATION(DURATION)) {
          if (DTEND==EMPTY) DTEND = DTSTART + DURATION;
          if (DTSTART==EMPTY) DTSTART = DTEND - DURATION;
        }
        // - detect alldays in vCalendar 1.0 (0:00-0:00 or 23:59 localtime)
        i = ALLDAYCOUNT(DTSTART,DTEND,TRUE);
        if (ITEMDATATYPE()=="vCalendar10" && i>0) {
          // DTSTART and DTEND represent allday event, make them date-only values
          // - convert start to user zone (or floating) so it represents midnight
          DTSTART = CONVERTTOUSERZONE(DTSTART);
          MAKEALLDAY(DTSTART,DTEND,i);
        }
        else {
          // iCalendar 2.0 - only if DTSTART is a date-only value this really is an allday
          if (ISDATEONLY(DTSTART)) {
            // reshape to make sure we don't have invalid zero-duration alldays (old OCS 9 servers)
            MAKEALLDAY(DTSTART,DTEND,i);
          }
        }

        // Make sure that all EXDATE times are in the same timezone as the start
        // time. Some servers send them as UTC, which is all fine and well, but
        // only if the timezone definition doesn't change. Also, libical does not
        // handle such UTC EXDATEs, so let's convert it while the UTC and
        // time zone definition (hopefully) are in sync.
        if (TIMEZONE(DTSTART) != "UTC" && !ISFLOATING(DTSTART)) {
          i = 0;
          timestamp exdate;
          while (i<SIZE(EXDATES)) {
            exdate = EXDATES[i];
            if (!ISDATEONLY(exdate) &&
                (TIMEZONE(exdate) == "UTC" || ISFLOATING(exdate))) {
              // "unfloat" floating time stamps: not sure whether that occcurs
              // in practice, but it looks as wrong as UTC EXDATEs
              EXDATES[i] = CONVERTTOZONE(exdate,DTSTART,TRUE);
            }
            i=i+1;
          }
        }
        // If vcalendar1.0, rrule is not secondly, minutely, or hourly, we strip time information
        // and only reserve date information
        if (ITEMDATATYPE()=="vCalendar10" && RR_FREQ!="h" && RR_FREQ!="m" && RR_FREQ!="s") {
          timestamp exdate;
          i = 0;
          while (i<SIZE(EXDATES)) {
            exdate = EXDATES[i];
            if (!ISDATEONLY(exdate)) {
              EXDATES[i] = DATEONLY(exdate);
            }
            i=i+1;
          }  
        }

        // Transform absolute alarm time back to relative time (mirrors the code in
        // VCALENDAR_OUTGOING_SCRIPT, see also BMC #11233). This applies to all
        // events, recurring or not, if the "alarmTimeToUTC" workaround is applied.
        // With a peer which cannot distinguish between absolute and relative
        // alarms we better treat all alarms as relative, because that is presented
        // more nicely to the user on the local side.
        if (ITEMDATATYPE()=="vCalendar10" &&
            ALARM_TIME!=EMPTY &&
            !ISDURATION(ALARM_TIME) &&
            SESSIONVAR("alarmTimeToUTC")) { 
            ALARM_TIME = ALARM_TIME - DTSTART;
        }

        // - shape attendees (and make sure ATTENDEES[] is assigned even for empty email addresses)
        i=0;
        while(i<SIZE(ATTENDEES) || i<SIZE(ATTENDEE_CNS)) {
          PARSEEMAILSPEC(ATTENDEES[i], CN, EM);
          ATTENDEES[i] = EM; // pure email address
          // in case we have no specific common name, use the one extracted from the email
          // This catches the vCalendar 1.0 case and eventually ill-formed iCalendar 2.0 as well
          if (ATTENDEE_CNS[i]==EMPTY)
            ATTENDEE_CNS[i]=CN;
          // default participation status to needs-action
          if (ATTENDEE_PARTSTATS[i]==EMPTY)
            ATTENDEE_PARTSTATS[i]=1; // 1=needs action
          i=i+1;
        }
        // - shape organizer
        PARSEEMAILSPEC(ORGANIZER, CN, EM);
        ORGANIZER = EM; // pure email address
        if (ORGANIZER_CN==EMPTY)
          ORGANIZER_CN=CN;
      }
      else {
        // VTODO
        // - make sure we have at least a summary
        if (SUMMARY==EMPTY) SUMMARY=DESCRIPTION; // use description if we don't have a summary
        if (SUMMARY==EMPTY) SUMMARY="unnamed"; // set dummy summary if we still don't have one
        // due shaping for non-iCalendar 2.0
        if (ITEMDATATYPE()=="vCalendar10" && ALLDAYCOUNT(DUE,DUE,TRUE,TRUE)>0) {
          DUE = DATEONLY(DUE);
        }
        if (ITEMDATATYPE()=="vCalendar10") {
          $VCALENDAR_10TO20_PRIORITY_CONVERSION;
        }
      }
      // a workaround for funambol: adding 'action' for 'alarm'
      // if item data type is vCalendar1.0, also add 'action' for 'alarm'.
      // This is a workaround for Mobical.net, which uses vCalendar1.0.
      if (ALARM_TIME!=EMPTY && ALARM_ACTION==EMPTY) {
          ALARM_ACTION = "DISPLAY";
      }
    ]]></macro>


    <macro name="VCALENDAR_OUTGOING_SCRIPT"><![CDATA[
      // set UTC time of generation for iCalendar 2.0 DTSTAMP
      DGENERATED = NOW();
      // make sure we have all trailing and leading spaces eliminated
      DESCRIPTION=NORMALIZED(DESCRIPTION);
      SUMMARY=NORMALIZED(SUMMARY);
      if (ISEVENT) {
        // VEVENT
        // - combine attendee email address and common name into single string for vCalendar 1.0
        if (ITEMDATATYPE()=="vCalendar10") {
          i=0;
          while(i<SIZE(ATTENDEES)) {
            ATTENDEES[i] = MAKEEMAILSPEC(ATTENDEE_CNS[i], ATTENDEES[i]);
            i=i+1;
          }
          ORGANIZER = MAKEEMAILSPEC(ORGANIZER_CN, ORGANIZER);
        }
      }
      else {
        // VTODO 
        // interal representation is iCalendar20
        if (ITEMDATATYPE()=="vCalendar10") {
          $VCALENDAR_20TO10_PRIORITY_CONVERSION;
        }
      }
      // make sure we have at least a summary
      if (SUMMARY==EMPTY) SUMMARY=SUBSTR(DESCRIPTION,0,32); // derive from description
      if (SUMMARY==EMPTY) SUMMARY="unnamed"; // in case description is empty as well
      // make sure that we have a DESCRIPTION, because some peers only support that;
      // can be avoided for peers where we are certain (from CtCaps) that they can
      // receive the text as part of the summary
      if (ISAVAILABLE(SUMMARY)!=TRUE && DESCRIPTION==EMPTY) DESCRIPTION=SUMMARY;
      // do NOT send duration (some servers crash when doing so)
      DURATION = UNASSIGNED;
      // shape alarm
      if (ALARM_TIME!=EMPTY) {
        if (ITEMDATATYPE()=="iCalendar20") {
          if (ALARM_ACTION==EMPTY) ALARM_ACTION = "AUDIO";
        }
        else {
          if (ALARM_MSG==EMPTY) ALARM_MSG="alarm";
        }
      }

      // for 'ALARM_TIME', convert duration time to UTC time
      // This workaround is for Mobical.net which can't understand duration time.
      // Also used with phones. The interpretation at least by Nokia
      // is that the absolute alarm time repeats together with the
      // event (BMC #11233). VCALENDAR_INCOMING_SCRIPT has the
      // corresponding transformation back (important for recurring events).
      if (SESSIONVAR("alarmTimeToUTC") && ITEMDATATYPE()=="vCalendar10"
            && ALARM_TIME!=EMPTY && ISDURATION(ALARM_TIME)) {
        TIMESTAMP ts;
        if (ALARM_REL==2)
          ts = DTEND; // relative to end
        else {
          if (ISEVENT)
            ts = DTSTART; // relative to start for events
          else
            ts = DUE; // relative to due for todos
        }

        ALARM_TIME = CONVERTTOUSERZONE(POINTINTIME(ts), TRUE) + ALARM_TIME;
        ALARM_TIME = CONVERTTOZONE(ALARM_TIME, "UTC");
      }
    ]]></macro>

    <!-- Uses the UID/RECURRENCE-ID fields as the only criteria for
         comparing calendar data if the VCALENDAR_COMPARE_UID session
         variable is true, else does a normal comparison of the
         fields. That comparison is based on the datatype definition
         and ignores UID because it is not trusted to be
         preserved and/or implemented by peers.

         In case of a UID match, the DMODIFIED fields are compared
         to determine the older item.
    -->
    <macro name="VCALENDAR_COMPARE_SCRIPT"><![CDATA[
    INTEGER RES;
    if (COMPARISONMODE() != "age" && SESSIONVAR("VCALENDAR_COMPARE_UID") ) {
        if (TARGET.UID == REFERENCE.UID &&
            TARGET.ORIGSTART == REFERENCE.ORIGSTART) {
            RES = 0;
        } else {
            RES = -999;
        }
    } else {
        RES = COMPAREFIELDS();
    }
    return RES;
    ]]></macro>