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2     //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/dt8.inc,v 1.2 2006/04/14 07:54:49 dashley Exp $
3     //--------------------------------------------------------------------------------------------------------------
4     //dt8.inc--FboPrime Functions Manipulating DT8 Data Type
5     //Copyright (C) 2006 David T. Ashley
6     //
7     //This program is free software; you can redistribute it and/or
8     //modify it under the terms of the GNU General Public License
9     //as published by the Free Software Foundation; either version 2
10     //of the License, or (at your option) any later version.
11     //
12     //This program is distributed in the hope that it will be useful,
13     //but WITHOUT ANY WARRANTY; without even the implied warranty of
15     //GNU General Public License for more details.
16     //
17     //You should have received a copy of the GNU General Public License
18     //along with this program; if not, write to the Free Software
19     //Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20     //-------------------------------------------------------------------------------------------------
21     //Copyright 2006 David T. Ashley
22     //-------------------------------------------------------------------------------------------------
23     //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
24     //PUBLIC LICENSE, Version 3, full license text below.
25     //-------------------------------------------------------------------------------------------------
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700     //-------------------------------------------------------------------------------------------------
701     //********************************************************************************
702     //This contains functions that deal with the DT8 data type (calenadar dates in
703     //the form "YYYYMMDD", for example "20060415".
704     //--------------------------------------------------------------------------------------------------------------
705     require_once("config.inc");
706     require_once("confighard.inc");
707     require_once("datefunc.inc");
708     //--------------------------------------------------------------------------------------------------------------
709     //
710     //Returns (1) if the DT8 is valid, or (0) otherwise. Additionally, if valid, the components
711     //are returned as integers, otherwise the page load date is returned. Here, "valid" is defined as:
712     // a)Right type.
713     // b)Syntactically valid.
714     // c)Date is within minimums and maximums of calendaring logic.
715     // d)Date is consistent with number of months in year and number of days in affected month.
716     //
717     //Parameters:
718     // dt8 : Value to examine.
719     // valid : (Output) 1 if valid, 0 otherwise.
720     // components : (Output) Defined only if valid,
721     // [0] Year, integer.
722     // [1] Month
723     // [2] Day
724     //
725     function DT8_extract_components($dt8, &$valid, &$components)
726     {
727     global $GLOBAL_stime_year;
728     global $GLOBAL_stime_month;
729     global $GLOBAL_stime_day;
731     //Define the output array to be today's date, just in case the parse fails.
732     $components = array ($GLOBAL_stime_year, $GLOBAL_stime_month, $GLOBAL_stime_day);
734     //Similarly, define $valid to be 0 so that a return creates an invalid flag.
735     $valid = 0;
737     if (!is_string($dt8)) //Must be right type.
738     return;
740     if (strlen($dt8) != 8) //Must be right length.
741     return;
743     //Extract characters.
744     $c0 = SubStr($dt8, 0, 1);
745     $c1 = SubStr($dt8, 1, 1);
746     $c2 = SubStr($dt8, 2, 1);
747     $c3 = SubStr($dt8, 3, 1);
748     $c4 = SubStr($dt8, 4, 1);
749     $c5 = SubStr($dt8, 5, 1);
750     $c6 = SubStr($dt8, 6, 1);
751     $c7 = SubStr($dt8, 7, 1);
753     //Check the character sets. Conditions below are necessary but not sufficient.
754     //
755     if (strpos("2" , $c0) === FALSE) //Thousands of year must be 2.
756     return;
757     if (strpos("0" , $c1) === FALSE) //Hundreds of year must be 0.
758     return;
759     if (strpos("0123456789" , $c2) === FALSE) //Tens of year may be any digit.
760     return;
761     if (strpos("0123456789" , $c3) === FALSE) //Ones of year may be any digit.
762     return;
763     if (strpos("01" , $c4) === FALSE) //Tens of month must be 0 or 1.
764     return;
765     if (strpos("0123456789" , $c5) === FALSE) //Ones of month may be any digit.
766     return;
767     if (strpos("0123" , $c6) === FALSE) //Tens of day must be 0-3.
768     return;
769     if (strpos("0123456789" , $c7) === FALSE) //Ones of day may be any digit.
770     return;
772     //Grab the values.
773     $val0 = strpos("0123456789", $c0);
774     $val1 = strpos("0123456789", $c1);
775     $val2 = strpos("0123456789", $c2);
776     $val3 = strpos("0123456789", $c3);
777     $val4 = strpos("0123456789", $c4);
778     $val5 = strpos("0123456789", $c5);
779     $val6 = strpos("0123456789", $c6);
780     $val7 = strpos("0123456789", $c7);
782     //Calculate the integers representing year, month, and day.
783     $year_int = $val0 * 1000 + $val1 * 100 + $val2 * 10 + $val3;
784     $month_int = $val4 * 10 + $val5;
785     $day_int = $val6 * 10 + $val7;
787     //Confine year.
788     if (($year_int < CONFIGHARD_DATEFUNC_MINYEAR) || ($year_int >= CONFIGHARD_DATEFUNC_MAXYEAR))
789     return;
791     //Confine month.
792     if (($month_int < 1) || ($month_int > 12))
793     return;
795     //Figure out how many days are supposed to be in that month, anyway.
796     $ndays = DATEFUNC_year_month_days($year_int, $month_int);
798     //Confine days.
799     if (($day_int < 1) || ($day_int > $ndays))
800     return;
802     //We have a confirmed good date. Return the info.
803     $valid = 1;
804     $components[0] = $year_int;
805     $components[1] = $month_int;
806     $components[2] = $day_int;
807     }
808     //
809     //--------------------------------------------------------------------------------------------------------------
810     //
811     //Makes a DT8 from components of integer year, integer month, and integer day.
812     //
813     function DT8_make_from_ints($year, $month, $day)
814     {
815     return(sprintf("%04d", $year) . sprintf("%02d", $month) . sprintf("%02d", $day));
816     }
817     //
818     //--------------------------------------------------------------------------------------------------------------
819     //End of $RCSfile: dt8.inc,v $.
820     //--------------------------------------------------------------------------------------------------------------
821     ?>

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