[3733] | 1 | <?php |
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| 2 | /** |
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| 3 | * Class for parsing RRule and getting us the dates |
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| 4 | * |
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| 5 | * @package awl |
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| 6 | * @subpackage caldav |
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| 7 | * @author Andrew McMillan <andrew@catalyst.net.nz> |
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| 8 | * @copyright Catalyst .Net Ltd |
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| 9 | * @license http://gnu.org/copyleft/gpl.html GNU GPL v2 |
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| 10 | */ |
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| 11 | |
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| 12 | $ical_weekdays = array( 'SU' => 0, 'MO' => 1, 'TU' => 2, 'WE' => 3, 'TH' => 4, 'FR' => 5, 'SA' => 6 ); |
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| 13 | |
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| 14 | /** |
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| 15 | * A Class for handling dates in iCalendar format. We do make the simplifying assumption |
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| 16 | * that all date handling in here is normalised to GMT. One day we might provide some |
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| 17 | * functions to do that, but for now it is done externally. |
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| 18 | * |
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| 19 | * @package awl |
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| 20 | */ |
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| 21 | class iCalDate { |
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| 22 | /**#@+ |
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| 23 | * @access private |
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| 24 | */ |
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| 25 | |
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| 26 | /** Text version */ |
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| 27 | var $_text; |
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| 28 | |
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| 29 | /** Epoch version */ |
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| 30 | var $_epoch; |
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| 31 | |
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| 32 | /** Fragmented parts */ |
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| 33 | var $_yy; |
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| 34 | var $_mo; |
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| 35 | var $_dd; |
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| 36 | var $_hh; |
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| 37 | var $_mi; |
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| 38 | var $_ss; |
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| 39 | var $_tz; |
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| 40 | |
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| 41 | /** Which day of the week does the week start on */ |
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| 42 | var $_wkst; |
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| 43 | |
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| 44 | /**#@-*/ |
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| 45 | |
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| 46 | /** |
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| 47 | * The constructor takes either an iCalendar date, a text string formatted as |
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| 48 | * an iCalendar date, or epoch seconds. |
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| 49 | */ |
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| 50 | function iCalDate( $input ) { |
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| 51 | if ( gettype($input) == 'object' ) { |
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| 52 | $this->_text = $input->_text; |
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| 53 | $this->_epoch = $input->_epoch; |
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| 54 | $this->_yy = $input->_yy; |
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| 55 | $this->_mo = $input->_mo; |
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| 56 | $this->_dd = $input->_dd; |
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| 57 | $this->_hh = $input->_hh; |
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| 58 | $this->_mi = $input->_mi; |
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| 59 | $this->_ss = $input->_ss; |
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| 60 | $this->_tz = $input->_tz; |
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| 61 | return; |
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| 62 | } |
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| 63 | |
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| 64 | $this->_wkst = 1; // Monday |
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| 65 | if ( preg_match( '/^\d{8}[T ]\d{6}$/', $input ) ) { |
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| 66 | $this->SetLocalDate($input); |
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| 67 | } |
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| 68 | else if ( preg_match( '/^\d{8}[T ]\d{6}Z$/', $input ) ) { |
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| 69 | $this->SetGMTDate($input); |
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| 70 | } |
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| 71 | else if ( intval($input) == 0 ) { |
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| 72 | $this->SetLocalDate(strtotime($input)); |
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| 73 | return; |
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| 74 | } |
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| 75 | else { |
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| 76 | $this->SetEpochDate($input); |
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| 77 | } |
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| 78 | } |
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| 79 | |
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| 80 | |
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| 81 | /** |
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| 82 | * Set the date from a text string |
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| 83 | */ |
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| 84 | function SetGMTDate( $input ) { |
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| 85 | $this->_text = $input; |
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| 86 | $this->_PartsFromText(); |
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| 87 | $this->_GMTEpochFromParts(); |
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| 88 | } |
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| 89 | |
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| 90 | |
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| 91 | /** |
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| 92 | * Set the date from a text string |
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| 93 | */ |
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| 94 | function SetLocalDate( $input ) { |
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| 95 | $this->_text = $input; |
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| 96 | $this->_PartsFromText(); |
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| 97 | $this->_EpochFromParts(); |
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| 98 | } |
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| 99 | |
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| 100 | |
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| 101 | /** |
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| 102 | * Set the date from an epoch |
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| 103 | */ |
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| 104 | function SetEpochDate( $input ) { |
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| 105 | $this->_epoch = intval($input); |
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| 106 | $this->_TextFromEpoch(); |
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| 107 | $this->_PartsFromText(); |
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| 108 | } |
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| 109 | |
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| 110 | |
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| 111 | /** |
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| 112 | * Given an epoch date, convert it to text |
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| 113 | */ |
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| 114 | function _TextFromEpoch() { |
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| 115 | $this->_text = date('Ymd\THis', $this->_epoch ); |
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| 116 | // dbg_error_log( "RRule", " Text %s from epoch %d", $this->_text, $this->_epoch ); |
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| 117 | } |
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| 118 | |
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| 119 | /** |
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| 120 | * Given a GMT epoch date, convert it to text |
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| 121 | */ |
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| 122 | function _GMTTextFromEpoch() { |
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| 123 | $this->_text = gmdate('Ymd\THis', $this->_epoch ); |
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| 124 | // dbg_error_log( "RRule", " Text %s from epoch %d", $this->_text, $this->_epoch ); |
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| 125 | } |
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| 126 | |
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| 127 | /** |
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| 128 | * Given a text date, convert it to parts |
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| 129 | */ |
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| 130 | function _PartsFromText() { |
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| 131 | $this->_yy = intval(substr($this->_text,0,4)); |
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| 132 | $this->_mo = intval(substr($this->_text,4,2)); |
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| 133 | $this->_dd = intval(substr($this->_text,6,2)); |
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| 134 | $this->_hh = intval(substr($this->_text,9,2)); |
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| 135 | $this->_mi = intval(substr($this->_text,11,2)); |
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| 136 | $this->_ss = intval(substr($this->_text,13,2)); |
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| 137 | } |
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| 138 | |
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| 139 | |
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| 140 | /** |
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| 141 | * Given a GMT text date, convert it to an epoch |
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| 142 | */ |
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| 143 | function _GMTEpochFromParts() { |
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| 144 | $this->_epoch = gmmktime ( $this->_hh, $this->_mi, $this->_ss, $this->_mo, $this->_dd, $this->_yy ); |
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| 145 | // dbg_error_log( "RRule", " Epoch %d from %04d-%02d-%02d %02d:%02d:%02d", $this->_epoch, $this->_yy, $this->_mo, $this->_dd, $this->_hh, $this->_mi, $this->_ss ); |
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| 146 | } |
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| 147 | |
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| 148 | |
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| 149 | /** |
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| 150 | * Given a local text date, convert it to an epoch |
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| 151 | */ |
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| 152 | function _EpochFromParts() { |
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| 153 | $this->_epoch = mktime ( $this->_hh, $this->_mi, $this->_ss, $this->_mo, $this->_dd, $this->_yy ); |
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| 154 | // dbg_error_log( "RRule", " Epoch %d from %04d-%02d-%02d %02d:%02d:%02d", $this->_epoch, $this->_yy, $this->_mo, $this->_dd, $this->_hh, $this->_mi, $this->_ss ); |
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| 155 | } |
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| 156 | |
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| 157 | |
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| 158 | /** |
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| 159 | * Set the day of week used for calculation of week starts |
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| 160 | * |
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| 161 | * @param string $weekstart The day of the week which is the first business day. |
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| 162 | */ |
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| 163 | function SetWeekStart($weekstart) { |
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| 164 | global $ical_weekdays; |
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| 165 | $this->_wkst = $ical_weekdays[$weekstart]; |
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| 166 | } |
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| 167 | |
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| 168 | |
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| 169 | /** |
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| 170 | * Set the day of week used for calculation of week starts |
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| 171 | */ |
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| 172 | function Render( $fmt = 'Y-m-d H:i:s' ) { |
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| 173 | return date( $fmt, $this->_epoch ); |
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| 174 | } |
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| 175 | |
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| 176 | |
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| 177 | /** |
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| 178 | * Render the date as GMT |
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| 179 | */ |
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| 180 | function RenderGMT( $fmt = 'Ymd\THis\Z' ) { |
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| 181 | return gmdate( $fmt, $this->_epoch ); |
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| 182 | } |
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| 183 | |
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| 184 | |
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| 185 | /** |
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| 186 | * No of days in a month 1(Jan) - 12(Dec) |
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| 187 | */ |
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| 188 | function DaysInMonth( $mo=false, $yy=false ) { |
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| 189 | if ( $mo === false ) $mo = $this->_mo; |
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| 190 | switch( $mo ) { |
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| 191 | case 1: // January |
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| 192 | case 3: // March |
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| 193 | case 5: // May |
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| 194 | case 7: // July |
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| 195 | case 8: // August |
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| 196 | case 10: // October |
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| 197 | case 12: // December |
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| 198 | return 31; |
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| 199 | break; |
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| 200 | |
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| 201 | case 4: // April |
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| 202 | case 6: // June |
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| 203 | case 9: // September |
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| 204 | case 11: // November |
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| 205 | return 30; |
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| 206 | break; |
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| 207 | |
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| 208 | case 2: // February |
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| 209 | if ( $yy === false ) $yy = $this->_yy; |
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| 210 | if ( (($yy % 4) == 0) && ((($yy % 100) != 0) || (($yy % 400) == 0) ) ) return 29; |
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| 211 | return 28; |
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| 212 | break; |
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| 213 | |
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| 214 | default: |
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| 215 | dbg_error_log( "ERROR"," Invalid month of '%s' passed to DaysInMonth", $mo ); |
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| 216 | break; |
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| 217 | |
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| 218 | } |
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| 219 | } |
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| 220 | |
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| 221 | |
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| 222 | /** |
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| 223 | * Set the day in the month to what we have been given |
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| 224 | */ |
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| 225 | function SetMonthDay( $dd ) { |
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| 226 | if ( $dd == $this->_dd ) return; // Shortcut |
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| 227 | $dd = min($dd,$this->DaysInMonth()); |
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| 228 | $this->_dd = $dd; |
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| 229 | $this->_EpochFromParts(); |
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| 230 | $this->_TextFromEpoch(); |
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| 231 | } |
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| 232 | |
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| 233 | |
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| 234 | /** |
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| 235 | * Add some number of months to a date |
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| 236 | */ |
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| 237 | function AddMonths( $mo ) { |
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| 238 | // dbg_error_log( "RRule", " Adding %d months to %s", $mo, $this->_text ); |
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| 239 | $this->_mo += $mo; |
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| 240 | while ( $this->_mo < 1 ) { |
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| 241 | $this->_mo += 12; |
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| 242 | $this->_yy--; |
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| 243 | } |
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| 244 | while ( $this->_mo > 12 ) { |
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| 245 | $this->_mo -= 12; |
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| 246 | $this->_yy++; |
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| 247 | } |
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| 248 | |
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| 249 | if ( ($this->_dd > 28 && $this->_mo == 2) || $this->_dd > 30 ) { |
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| 250 | // Ensure the day of month is still reasonable and coerce to last day of month if needed |
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| 251 | $dim = $this->DaysInMonth(); |
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| 252 | if ( $this->_dd > $dim ) { |
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| 253 | $this->_dd = $dim; |
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| 254 | } |
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| 255 | } |
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| 256 | $this->_EpochFromParts(); |
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| 257 | $this->_TextFromEpoch(); |
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| 258 | // dbg_error_log( "RRule", " Added %d months and got %s", $mo, $this->_text ); |
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| 259 | } |
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| 260 | |
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| 261 | |
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| 262 | /** |
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| 263 | * Add some integer number of days to a date |
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| 264 | */ |
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| 265 | function AddDays( $dd ) { |
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| 266 | $at_start = $this->_text; |
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| 267 | $this->_dd += $dd; |
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| 268 | while ( 1 > $this->_dd ) { |
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| 269 | $this->_mo--; |
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| 270 | if ( $this->_mo < 1 ) { |
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| 271 | $this->_mo += 12; |
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| 272 | $this->_yy--; |
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| 273 | } |
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| 274 | $this->_dd += $this->DaysInMonth(); |
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| 275 | } |
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| 276 | while ( ($dim = $this->DaysInMonth($this->_mo)) < $this->_dd ) { |
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| 277 | $this->_dd -= $dim; |
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| 278 | $this->_mo++; |
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| 279 | if ( $this->_mo > 12 ) { |
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| 280 | $this->_mo -= 12; |
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| 281 | $this->_yy++; |
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| 282 | } |
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| 283 | } |
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| 284 | $this->_EpochFromParts(); |
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| 285 | $this->_TextFromEpoch(); |
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| 286 | // dbg_error_log( "RRule", " Added %d days to %s and got %s", $dd, $at_start, $this->_text ); |
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| 287 | } |
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| 288 | |
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| 289 | |
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| 290 | /** |
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| 291 | * Add duration |
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| 292 | */ |
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| 293 | function AddDuration( $duration ) { |
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| 294 | if ( strstr($duration,'T') === false ) $duration .= 'T'; |
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| 295 | list( $sign, $days, $time ) = preg_split( '/[PT]/', $duration ); |
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| 296 | $sign = ( $sign == "-" ? -1 : 1); |
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| 297 | // dbg_error_log( "RRule", " Adding duration to '%s' of sign: %d, days: %s, time: %s", $this->_text, $sign, $days, $time ); |
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| 298 | if ( preg_match( '/(\d+)(D|W)/', $days, $matches ) ) { |
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| 299 | $days = intval($matches[1]); |
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| 300 | if ( $matches[2] == 'W' ) $days *= 7; |
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| 301 | $this->AddDays( $days * $sign ); |
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| 302 | } |
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| 303 | $hh = 0; $mi = 0; $ss = 0; |
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| 304 | if ( preg_match( '/(\d+)(H)/', $time, $matches ) ) $hh = $matches[1]; |
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| 305 | if ( preg_match( '/(\d+)(M)/', $time, $matches ) ) $mi = $matches[1]; |
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| 306 | if ( preg_match( '/(\d+)(S)/', $time, $matches ) ) $ss = $matches[1]; |
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| 307 | |
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| 308 | // dbg_error_log( "RRule", " Adding %02d:%02d:%02d * %d to %02d:%02d:%02d", $hh, $mi, $ss, $sign, $this->_hh, $this->_mi, $this->_ss ); |
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| 309 | $this->_hh += ($hh * $sign); |
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| 310 | $this->_mi += ($mi * $sign); |
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| 311 | $this->_ss += ($ss * $sign); |
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| 312 | |
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| 313 | if ( $this->_ss < 0 ) { $this->_mi -= (intval(abs($this->_ss/60))+1); $this->_ss += ((intval(abs($this->_mi/60))+1) * 60); } |
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| 314 | if ( $this->_ss > 59) { $this->_mi += (intval(abs($this->_ss/60))+1); $this->_ss -= ((intval(abs($this->_mi/60))+1) * 60); } |
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| 315 | if ( $this->_mi < 0 ) { $this->_hh -= (intval(abs($this->_mi/60))+1); $this->_mi += ((intval(abs($this->_mi/60))+1) * 60); } |
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| 316 | if ( $this->_mi > 59) { $this->_hh += (intval(abs($this->_mi/60))+1); $this->_mi -= ((intval(abs($this->_mi/60))+1) * 60); } |
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| 317 | if ( $this->_hh < 0 ) { $this->AddDays( -1 * (intval(abs($this->_hh/24))+1) ); $this->_hh += ((intval(abs($this->_hh/24))+1)*24); } |
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| 318 | if ( $this->_hh > 23) { $this->AddDays( (intval(abs($this->_hh/24))+1) ); $this->_hh -= ((intval(abs($this->_hh/24))+1)*24); } |
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| 319 | |
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| 320 | $this->_EpochFromParts(); |
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| 321 | $this->_TextFromEpoch(); |
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| 322 | } |
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| 323 | |
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| 324 | |
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| 325 | /** |
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| 326 | * Produce an iCalendar format DURATION for the difference between this an another iCalDate |
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| 327 | * |
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| 328 | * @param date $from The start of the period |
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| 329 | * @return string The date difference, as an iCalendar duration format |
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| 330 | */ |
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| 331 | function DateDifference( $from ) { |
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| 332 | if ( !is_object($from) ) { |
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| 333 | $from = new iCalDate($from); |
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| 334 | } |
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| 335 | if ( $from->_epoch < $this->_epoch ) { |
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| 336 | /** One way to simplify is to always go for positive differences */ |
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| 337 | return( "-". $from->DateDifference( $self ) ); |
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| 338 | } |
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| 339 | // if ( $from->_yy == $this->_yy && $from->_mo == $this->_mo ) { |
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| 340 | /** Also somewhat simpler if we can use seconds */ |
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| 341 | $diff = $from->_epoch - $this->_epoch; |
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| 342 | $result = ""; |
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| 343 | if ( $diff >= 86400) { |
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| 344 | $result = intval($diff / 86400); |
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| 345 | $diff = $diff % 86400; |
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| 346 | if ( $diff == 0 && (($result % 7) == 0) ) { |
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| 347 | // Duration is an integer number of weeks. |
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| 348 | $result .= intval($result / 7) . "W"; |
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| 349 | return $result; |
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| 350 | } |
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| 351 | $result .= "D"; |
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| 352 | } |
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| 353 | $result = "P".$result."T"; |
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| 354 | if ( $diff >= 3600) { |
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| 355 | $result .= intval($diff / 3600) . "H"; |
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| 356 | $diff = $diff % 3600; |
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| 357 | } |
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| 358 | if ( $diff >= 60) { |
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| 359 | $result .= intval($diff / 60) . "M"; |
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| 360 | $diff = $diff % 60; |
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| 361 | } |
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| 362 | if ( $diff > 0) { |
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| 363 | $result .= intval($diff) . "S"; |
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| 364 | } |
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| 365 | return $result; |
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| 366 | // } |
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| 367 | |
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| 368 | /** |
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| 369 | * From an intense reading of RFC2445 it appears that durations which are not expressible |
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| 370 | * in Weeks/Days/Hours/Minutes/Seconds are invalid. |
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| 371 | * ==> This code is not needed then :-) |
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| 372 | $yy = $from->_yy - $this->_yy; |
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| 373 | $mo = $from->_mo - $this->_mo; |
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| 374 | $dd = $from->_dd - $this->_dd; |
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| 375 | $hh = $from->_hh - $this->_hh; |
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| 376 | $mi = $from->_mi - $this->_mi; |
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| 377 | $ss = $from->_ss - $this->_ss; |
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| 378 | |
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| 379 | if ( $ss < 0 ) { $mi -= 1; $ss += 60; } |
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| 380 | if ( $mi < 0 ) { $hh -= 1; $mi += 60; } |
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| 381 | if ( $hh < 0 ) { $dd -= 1; $hh += 24; } |
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| 382 | if ( $dd < 0 ) { $mo -= 1; $dd += $this->DaysInMonth(); } // Which will use $this->_(mo|yy) - seemingly sensible |
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| 383 | if ( $mo < 0 ) { $yy -= 1; $mo += 12; } |
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| 384 | |
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| 385 | $result = ""; |
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| 386 | if ( $yy > 0) { $result .= $yy."Y"; } |
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| 387 | if ( $mo > 0) { $result .= $mo."M"; } |
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| 388 | if ( $dd > 0) { $result .= $dd."D"; } |
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| 389 | $result .= "T"; |
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| 390 | if ( $hh > 0) { $result .= $hh."H"; } |
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| 391 | if ( $mi > 0) { $result .= $mi."M"; } |
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| 392 | if ( $ss > 0) { $result .= $ss."S"; } |
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| 393 | return $result; |
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| 394 | */ |
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| 395 | } |
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| 396 | |
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| 397 | /** |
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| 398 | * Test to see if our _mo matches something in the list of months we have received. |
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| 399 | * @param string $monthlist A comma-separated list of months. |
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| 400 | * @return boolean Whether this date falls within one of those months. |
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| 401 | */ |
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| 402 | function TestByMonth( $monthlist ) { |
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| 403 | // dbg_error_log( "RRule", " Testing BYMONTH %s against month %d", (isset($monthlist) ? $monthlist : "no month list"), $this->_mo ); |
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| 404 | if ( !isset($monthlist) ) return true; // If BYMONTH is not specified any month is OK |
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| 405 | $months = array_flip(explode( ',',$monthlist )); |
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| 406 | return isset($months[$this->_mo]); |
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| 407 | } |
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| 408 | |
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| 409 | /** |
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| 410 | * Applies any BYDAY to the month to return a set of days |
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| 411 | * @param string $byday The BYDAY rule |
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| 412 | * @return array An array of the day numbers for the month which meet the rule. |
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| 413 | */ |
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| 414 | function GetMonthByDay($byday) { |
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| 415 | // dbg_error_log( "RRule", " Applying BYDAY %s to month", $byday ); |
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| 416 | $days_in_month = $this->DaysInMonth(); |
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| 417 | $dayrules = explode(',',$byday); |
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| 418 | $set = array(); |
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| 419 | $first_dow = (date('w',$this->_epoch) - $this->_dd + 36) % 7; |
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| 420 | foreach( $dayrules AS $k => $v ) { |
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| 421 | $days = $this->MonthDays($first_dow,$days_in_month,$v); |
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| 422 | foreach( $days AS $k2 => $v2 ) { |
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| 423 | $set[$v2] = $v2; |
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| 424 | } |
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| 425 | } |
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| 426 | asort( $set, SORT_NUMERIC ); |
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| 427 | return $set; |
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| 428 | } |
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| 429 | |
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| 430 | /** |
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| 431 | * Applies any BYMONTHDAY to the month to return a set of days |
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| 432 | * @param string $bymonthday The BYMONTHDAY rule |
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| 433 | * @return array An array of the day numbers for the month which meet the rule. |
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| 434 | */ |
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| 435 | function GetMonthByMonthDay($bymonthday) { |
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| 436 | // dbg_error_log( "RRule", " Applying BYMONTHDAY %s to month", $bymonthday ); |
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| 437 | $days_in_month = $this->DaysInMonth(); |
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| 438 | $dayrules = explode(',',$bymonthday); |
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| 439 | $set = array(); |
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| 440 | foreach( $dayrules AS $k => $v ) { |
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| 441 | $v = intval($v); |
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| 442 | if ( $v > 0 && $v <= $days_in_month ) $set[$v] = $v; |
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| 443 | } |
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| 444 | asort( $set, SORT_NUMERIC ); |
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| 445 | return $set; |
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| 446 | } |
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| 447 | |
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| 448 | |
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| 449 | /** |
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| 450 | * Applies any BYDAY to the week to return a set of days |
---|
| 451 | * @param string $byday The BYDAY rule |
---|
| 452 | * @param string $increasing When we are moving by months, we want any day of the week, but when by day we only want to increase. Default false. |
---|
| 453 | * @return array An array of the day numbers for the week which meet the rule. |
---|
| 454 | */ |
---|
| 455 | function GetWeekByDay($byday, $increasing = false) { |
---|
| 456 | global $ical_weekdays; |
---|
| 457 | // dbg_error_log( "RRule", " Applying BYDAY %s to week", $byday ); |
---|
| 458 | $days = explode(',',$byday); |
---|
| 459 | $dow = date('w',$this->_epoch); |
---|
| 460 | $set = array(); |
---|
| 461 | foreach( $days AS $k => $v ) { |
---|
| 462 | $daynum = $ical_weekdays[$v]; |
---|
| 463 | $dd = $this->_dd - $dow + $daynum; |
---|
| 464 | if ( $daynum < $this->_wkst ) $dd += 7; |
---|
| 465 | if ( $dd > $this->_dd || !$increasing ) $set[$dd] = $dd; |
---|
| 466 | } |
---|
| 467 | asort( $set, SORT_NUMERIC ); |
---|
| 468 | |
---|
| 469 | return $set; |
---|
| 470 | } |
---|
| 471 | |
---|
| 472 | |
---|
| 473 | /** |
---|
| 474 | * Test if $this is greater than the date parameter |
---|
| 475 | * @param string $lesser The other date, as a local time string |
---|
| 476 | * @return boolean True if $this > $lesser |
---|
| 477 | */ |
---|
| 478 | function GreaterThan($lesser) { |
---|
| 479 | if ( is_object($lesser) ) { |
---|
| 480 | // dbg_error_log( "RRule", " Comparing %s with %s", $this->_text, $lesser->_text ); |
---|
| 481 | return ( $this->_text > $lesser->_text ); |
---|
| 482 | } |
---|
| 483 | // dbg_error_log( "RRule", " Comparing %s with %s", $this->_text, $lesser ); |
---|
| 484 | return ( $this->_text > $lesser ); // These sorts of dates are designed that way... |
---|
| 485 | } |
---|
| 486 | |
---|
| 487 | |
---|
| 488 | /** |
---|
| 489 | * Test if $this is less than the date parameter |
---|
| 490 | * @param string $greater The other date, as a local time string |
---|
| 491 | * @return boolean True if $this < $greater |
---|
| 492 | */ |
---|
| 493 | function LessThan($greater) { |
---|
| 494 | if ( is_object($greater) ) { |
---|
| 495 | // dbg_error_log( "RRule", " Comparing %s with %s", $this->_text, $greater->_text ); |
---|
| 496 | return ( $this->_text < $greater->_text ); |
---|
| 497 | } |
---|
| 498 | // dbg_error_log( "RRule", " Comparing %s with %s", $this->_text, $greater ); |
---|
| 499 | return ( $this->_text < $greater ); // These sorts of dates are designed that way... |
---|
| 500 | } |
---|
| 501 | |
---|
| 502 | |
---|
| 503 | /** |
---|
| 504 | * Given a MonthDays string like "1MO", "-2WE" return an integer day of the month. |
---|
| 505 | * |
---|
| 506 | * @param string $dow_first The day of week of the first of the month. |
---|
| 507 | * @param string $days_in_month The number of days in the month. |
---|
| 508 | * @param string $dayspec The specification for a month day (or days) which we parse. |
---|
| 509 | * |
---|
| 510 | * @return array An array of the day numbers for the month which meet the rule. |
---|
| 511 | */ |
---|
| 512 | function &MonthDays($dow_first, $days_in_month, $dayspec) { |
---|
| 513 | global $ical_weekdays; |
---|
| 514 | // dbg_error_log( "RRule", "MonthDays: Getting days for '%s'. %d days starting on a %d", $dayspec, $days_in_month, $dow_first ); |
---|
| 515 | $set = array(); |
---|
| 516 | preg_match( '/([0-9-]*)(MO|TU|WE|TH|FR|SA|SU)/', $dayspec, $matches); |
---|
| 517 | $numeric = intval($matches[1]); |
---|
| 518 | $dow = $ical_weekdays[$matches[2]]; |
---|
| 519 | |
---|
| 520 | $first_matching_day = 1 + ($dow - $dow_first); |
---|
| 521 | while ( $first_matching_day < 1 ) $first_matching_day += 7; |
---|
| 522 | |
---|
| 523 | // dbg_error_log( "RRule", " MonthDays: Looking at %d for first match on (%s/%s), %d for numeric", $first_matching_day, $matches[1], $matches[2], $numeric ); |
---|
| 524 | |
---|
| 525 | while( $first_matching_day <= $days_in_month ) { |
---|
| 526 | $set[] = $first_matching_day; |
---|
| 527 | $first_matching_day += 7; |
---|
| 528 | } |
---|
| 529 | |
---|
| 530 | if ( $numeric != 0 ) { |
---|
| 531 | if ( $numeric < 0 ) { |
---|
| 532 | $numeric += count($set); |
---|
| 533 | } |
---|
| 534 | else { |
---|
| 535 | $numeric--; |
---|
| 536 | } |
---|
| 537 | $answer = $set[$numeric]; |
---|
| 538 | $set = array( $answer => $answer ); |
---|
| 539 | } |
---|
| 540 | else { |
---|
| 541 | $answers = $set; |
---|
| 542 | $set = array(); |
---|
| 543 | foreach( $answers AS $k => $v ) { |
---|
| 544 | $set[$v] = $v; |
---|
| 545 | } |
---|
| 546 | } |
---|
| 547 | |
---|
| 548 | // dbg_log_array( "RRule", 'MonthDays', $set, false ); |
---|
| 549 | |
---|
| 550 | return $set; |
---|
| 551 | } |
---|
| 552 | |
---|
| 553 | |
---|
| 554 | /** |
---|
| 555 | * Given set position descriptions like '1', '3', '11', '-3' or '-1' and a set, |
---|
| 556 | * return the subset matching the list of set positions. |
---|
| 557 | * |
---|
| 558 | * @param string $bysplist The list of set positions. |
---|
| 559 | * @param string $set The set of days that we will apply the positions to. |
---|
| 560 | * |
---|
| 561 | * @return array The subset which matches. |
---|
| 562 | */ |
---|
| 563 | function &ApplyBySetPos($bysplist, $set) { |
---|
| 564 | // dbg_error_log( "RRule", " ApplyBySetPos: Applying set position '%s' to set of %d days", $bysplist, count($set) ); |
---|
| 565 | $subset = array(); |
---|
| 566 | sort( $set, SORT_NUMERIC ); |
---|
| 567 | $max = count($set); |
---|
| 568 | $positions = explode( '[^0-9-]', $bysplist ); |
---|
| 569 | foreach( $positions AS $k => $v ) { |
---|
| 570 | if ( $v < 0 ) { |
---|
| 571 | $v += $max; |
---|
| 572 | } |
---|
| 573 | else { |
---|
| 574 | $v--; |
---|
| 575 | } |
---|
| 576 | $subset[$set[$v]] = $set[$v]; |
---|
| 577 | } |
---|
| 578 | return $subset; |
---|
| 579 | } |
---|
| 580 | } |
---|
| 581 | |
---|
| 582 | |
---|
| 583 | |
---|
| 584 | /** |
---|
| 585 | * A Class for handling Events on a calendar which repeat |
---|
| 586 | * |
---|
| 587 | * Here's the spec, from RFC2445: |
---|
| 588 | * |
---|
| 589 | recur = "FREQ"=freq *( |
---|
| 590 | |
---|
| 591 | ; either UNTIL or COUNT may appear in a 'recur', |
---|
| 592 | ; but UNTIL and COUNT MUST NOT occur in the same 'recur' |
---|
| 593 | |
---|
| 594 | ( ";" "UNTIL" "=" enddate ) / |
---|
| 595 | ( ";" "COUNT" "=" 1*DIGIT ) / |
---|
| 596 | |
---|
| 597 | ; the rest of these keywords are optional, |
---|
| 598 | ; but MUST NOT occur more than once |
---|
| 599 | |
---|
| 600 | ( ";" "INTERVAL" "=" 1*DIGIT ) / |
---|
| 601 | ( ";" "BYSECOND" "=" byseclist ) / |
---|
| 602 | ( ";" "BYMINUTE" "=" byminlist ) / |
---|
| 603 | ( ";" "BYHOUR" "=" byhrlist ) / |
---|
| 604 | ( ";" "BYDAY" "=" bywdaylist ) / |
---|
| 605 | ( ";" "BYMONTHDAY" "=" bymodaylist ) / |
---|
| 606 | ( ";" "BYYEARDAY" "=" byyrdaylist ) / |
---|
| 607 | ( ";" "BYWEEKNO" "=" bywknolist ) / |
---|
| 608 | ( ";" "BYMONTH" "=" bymolist ) / |
---|
| 609 | ( ";" "BYSETPOS" "=" bysplist ) / |
---|
| 610 | ( ";" "WKST" "=" weekday ) / |
---|
| 611 | ( ";" x-name "=" text ) |
---|
| 612 | ) |
---|
| 613 | |
---|
| 614 | freq = "SECONDLY" / "MINUTELY" / "HOURLY" / "DAILY" |
---|
| 615 | / "WEEKLY" / "MONTHLY" / "YEARLY" |
---|
| 616 | |
---|
| 617 | enddate = date |
---|
| 618 | enddate =/ date-time ;An UTC value |
---|
| 619 | |
---|
| 620 | byseclist = seconds / ( seconds *("," seconds) ) |
---|
| 621 | |
---|
| 622 | seconds = 1DIGIT / 2DIGIT ;0 to 59 |
---|
| 623 | |
---|
| 624 | byminlist = minutes / ( minutes *("," minutes) ) |
---|
| 625 | |
---|
| 626 | minutes = 1DIGIT / 2DIGIT ;0 to 59 |
---|
| 627 | |
---|
| 628 | byhrlist = hour / ( hour *("," hour) ) |
---|
| 629 | |
---|
| 630 | hour = 1DIGIT / 2DIGIT ;0 to 23 |
---|
| 631 | |
---|
| 632 | bywdaylist = weekdaynum / ( weekdaynum *("," weekdaynum) ) |
---|
| 633 | |
---|
| 634 | weekdaynum = [([plus] ordwk / minus ordwk)] weekday |
---|
| 635 | |
---|
| 636 | plus = "+" |
---|
| 637 | |
---|
| 638 | minus = "-" |
---|
| 639 | |
---|
| 640 | ordwk = 1DIGIT / 2DIGIT ;1 to 53 |
---|
| 641 | |
---|
| 642 | weekday = "SU" / "MO" / "TU" / "WE" / "TH" / "FR" / "SA" |
---|
| 643 | ;Corresponding to SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, |
---|
| 644 | ;FRIDAY, SATURDAY and SUNDAY days of the week. |
---|
| 645 | |
---|
| 646 | bymodaylist = monthdaynum / ( monthdaynum *("," monthdaynum) ) |
---|
| 647 | |
---|
| 648 | monthdaynum = ([plus] ordmoday) / (minus ordmoday) |
---|
| 649 | |
---|
| 650 | ordmoday = 1DIGIT / 2DIGIT ;1 to 31 |
---|
| 651 | |
---|
| 652 | byyrdaylist = yeardaynum / ( yeardaynum *("," yeardaynum) ) |
---|
| 653 | |
---|
| 654 | yeardaynum = ([plus] ordyrday) / (minus ordyrday) |
---|
| 655 | |
---|
| 656 | ordyrday = 1DIGIT / 2DIGIT / 3DIGIT ;1 to 366 |
---|
| 657 | |
---|
| 658 | bywknolist = weeknum / ( weeknum *("," weeknum) ) |
---|
| 659 | |
---|
| 660 | weeknum = ([plus] ordwk) / (minus ordwk) |
---|
| 661 | |
---|
| 662 | bymolist = monthnum / ( monthnum *("," monthnum) ) |
---|
| 663 | |
---|
| 664 | monthnum = 1DIGIT / 2DIGIT ;1 to 12 |
---|
| 665 | |
---|
| 666 | bysplist = setposday / ( setposday *("," setposday) ) |
---|
| 667 | |
---|
| 668 | setposday = yeardaynum |
---|
| 669 | * |
---|
| 670 | * At this point we are going to restrict ourselves to parts of the RRULE specification |
---|
| 671 | * seen in the wild. And by "in the wild" I don't include within people's timezone |
---|
| 672 | * definitions. We always convert time zones to canonical names and assume the lower |
---|
| 673 | * level libraries can do a better job with them than we can. |
---|
| 674 | * |
---|
| 675 | * We will concentrate on: |
---|
| 676 | * FREQ=(YEARLY|MONTHLY|WEEKLY|DAILY) |
---|
| 677 | * UNTIL= |
---|
| 678 | * COUNT= |
---|
| 679 | * INTERVAL= |
---|
| 680 | * BYDAY= |
---|
| 681 | * BYMONTHDAY= |
---|
| 682 | * BYSETPOS= |
---|
| 683 | * WKST= |
---|
| 684 | * BYYEARDAY= |
---|
| 685 | * BYWEEKNO= |
---|
| 686 | * BYMONTH= |
---|
| 687 | * |
---|
| 688 | * |
---|
| 689 | * @package awl |
---|
| 690 | */ |
---|
| 691 | class RRule { |
---|
| 692 | /**#@+ |
---|
| 693 | * @access private |
---|
| 694 | */ |
---|
| 695 | |
---|
| 696 | /** The first instance */ |
---|
| 697 | var $_first; |
---|
| 698 | |
---|
| 699 | /** The current instance pointer */ |
---|
| 700 | var $_current; |
---|
| 701 | |
---|
| 702 | /** An array of all the dates so far */ |
---|
| 703 | var $_dates; |
---|
| 704 | |
---|
| 705 | /** Whether we have calculated any of the dates */ |
---|
| 706 | var $_started; |
---|
| 707 | |
---|
| 708 | /** Whether we have calculated all of the dates */ |
---|
| 709 | var $_finished; |
---|
| 710 | |
---|
| 711 | /** The rule, in all it's glory */ |
---|
| 712 | var $_rule; |
---|
| 713 | |
---|
| 714 | /** The rule, in all it's parts */ |
---|
| 715 | var $_part; |
---|
| 716 | |
---|
| 717 | /**#@-*/ |
---|
| 718 | |
---|
| 719 | /** |
---|
| 720 | * The constructor takes a start date and an RRULE definition. Both of these |
---|
| 721 | * follow the iCalendar standard. |
---|
| 722 | */ |
---|
| 723 | function RRule( $start, $rrule ) { |
---|
| 724 | $this->_first = new iCalDate($start); |
---|
| 725 | $this->_finished = false; |
---|
| 726 | $this->_started = false; |
---|
| 727 | $this->_dates = array(); |
---|
| 728 | $this->_current = -1; |
---|
| 729 | |
---|
| 730 | $this->_rule = preg_replace( '/\s/m', '', $rrule); |
---|
| 731 | if ( substr($this->_rule, 0, 6) == 'RRULE:' ) { |
---|
| 732 | $this->_rule = substr($this->_rule, 6); |
---|
| 733 | } |
---|
| 734 | |
---|
| 735 | dbg_error_log( "RRule", " new RRule: Start: %s, RRULE: %s", $start->Render(), $this->_rule ); |
---|
| 736 | |
---|
| 737 | $parts = explode(';',$this->_rule); |
---|
| 738 | $this->_part = array( 'INTERVAL' => 1 ); |
---|
| 739 | foreach( $parts AS $k => $v ) { |
---|
| 740 | list( $type, $value ) = explode( '=', $v, 2); |
---|
| 741 | // dbg_error_log( "RRule", " Parts of %s explode into %s and %s", $v, $type, $value ); |
---|
| 742 | $this->_part[$type] = $value; |
---|
| 743 | } |
---|
| 744 | |
---|
| 745 | // A little bit of validation |
---|
| 746 | if ( !isset($this->_part['FREQ']) ) { |
---|
| 747 | dbg_error_log( "ERROR", " RRULE MUST have FREQ=value (%s)", $rrule ); |
---|
| 748 | } |
---|
| 749 | if ( isset($this->_part['COUNT']) && isset($this->_part['UNTIL']) ) { |
---|
| 750 | dbg_error_log( "ERROR", " RRULE MUST NOT have both COUNT=value and UNTIL=value (%s)", $rrule ); |
---|
| 751 | } |
---|
| 752 | if ( isset($this->_part['COUNT']) && intval($this->_part['COUNT']) < 1 ) { |
---|
| 753 | dbg_error_log( "ERROR", " RRULE MUST NOT have both COUNT=value and UNTIL=value (%s)", $rrule ); |
---|
| 754 | } |
---|
| 755 | if ( !preg_match( '/(YEAR|MONTH|WEEK|DAI)LY/', $this->_part['FREQ']) ) { |
---|
| 756 | dbg_error_log( "ERROR", " RRULE Only FREQ=(YEARLY|MONTHLY|WEEKLY|DAILY) are supported at present (%s)", $rrule ); |
---|
| 757 | } |
---|
| 758 | if ( $this->_part['FREQ'] == "YEARLY" ) { |
---|
| 759 | $this->_part['INTERVAL'] *= 12; |
---|
| 760 | $this->_part['FREQ'] = "MONTHLY"; |
---|
| 761 | } |
---|
| 762 | } |
---|
| 763 | |
---|
| 764 | |
---|
| 765 | /** |
---|
| 766 | * Processes the array of $relative_days to $base and removes any |
---|
| 767 | * which are not within the scope of our rule. |
---|
| 768 | */ |
---|
| 769 | function WithinScope( $base, $relative_days ) { |
---|
| 770 | |
---|
| 771 | $ok_days = array(); |
---|
| 772 | |
---|
| 773 | $ptr = $this->_current; |
---|
| 774 | |
---|
| 775 | // dbg_error_log( "RRule", " WithinScope: Processing list of %d days relative to %s", count($relative_days), $base->Render() ); |
---|
| 776 | foreach( $relative_days AS $day => $v ) { |
---|
| 777 | |
---|
| 778 | $test = new iCalDate($base); |
---|
| 779 | $days_in_month = $test->DaysInMonth(); |
---|
| 780 | |
---|
| 781 | // dbg_error_log( "RRule", " WithinScope: Testing for day %d based on %s, with %d days in month", $day, $test->Render(), $days_in_month ); |
---|
| 782 | if ( $day > $days_in_month ) { |
---|
| 783 | $test->SetMonthDay($days_in_month); |
---|
| 784 | $test->AddDays(1); |
---|
| 785 | $day -= $days_in_month; |
---|
| 786 | $test->SetMonthDay($day); |
---|
| 787 | } |
---|
| 788 | else if ( $day < 1 ) { |
---|
| 789 | $test->SetMonthDay(1); |
---|
| 790 | $test->AddDays(-1); |
---|
| 791 | $days_in_month = $test->DaysInMonth(); |
---|
| 792 | $day += $days_in_month; |
---|
| 793 | $test->SetMonthDay($day); |
---|
| 794 | } |
---|
| 795 | else { |
---|
| 796 | $test->SetMonthDay($day); |
---|
| 797 | } |
---|
| 798 | |
---|
| 799 | // dbg_error_log( "RRule", " WithinScope: Testing if %s is within scope", count($relative_days), $test->Render() ); |
---|
| 800 | |
---|
| 801 | if ( isset($this->_part['UNTIL']) && $test->GreaterThan($this->_part['UNTIL']) ) { |
---|
| 802 | $this->_finished = true; |
---|
| 803 | return $ok_days; |
---|
| 804 | } |
---|
| 805 | |
---|
| 806 | // if ( $this->_current >= 0 && $test->LessThan($this->_dates[$this->_current]) ) continue; |
---|
| 807 | |
---|
| 808 | if ( !$test->LessThan($this->_first) ) { |
---|
| 809 | // dbg_error_log( "RRule", " WithinScope: Looks like %s is within scope", $test->Render() ); |
---|
| 810 | $ok_days[$day] = $test; |
---|
| 811 | $ptr++; |
---|
| 812 | } |
---|
| 813 | |
---|
| 814 | if ( isset($this->_part['COUNT']) && $ptr >= $this->_part['COUNT'] ) { |
---|
| 815 | $this->_finished = true; |
---|
| 816 | return $ok_days; |
---|
| 817 | } |
---|
| 818 | |
---|
| 819 | } |
---|
| 820 | |
---|
| 821 | return $ok_days; |
---|
| 822 | } |
---|
| 823 | |
---|
| 824 | |
---|
| 825 | /** |
---|
| 826 | * This is most of the meat of the RRULE processing, where we find the next date. |
---|
| 827 | * We maintain an |
---|
| 828 | */ |
---|
| 829 | function &GetNext( ) { |
---|
| 830 | |
---|
| 831 | if ( $this->_current < 0 ) { |
---|
| 832 | $next = new iCalDate($this->_first); |
---|
| 833 | $this->_current++; |
---|
| 834 | } |
---|
| 835 | else { |
---|
| 836 | $next = new iCalDate($this->_dates[$this->_current]); |
---|
| 837 | $this->_current++; |
---|
| 838 | |
---|
| 839 | /** |
---|
| 840 | * If we have already found some dates we may just be able to return one of those. |
---|
| 841 | */ |
---|
| 842 | if ( isset($this->_dates[$this->_current]) ) { |
---|
| 843 | // dbg_error_log( "RRule", " GetNext: Returning %s, (%d'th)", $this->_dates[$this->_current]->Render(), $this->_current ); |
---|
| 844 | return $this->_dates[$this->_current]; |
---|
| 845 | } |
---|
| 846 | else { |
---|
| 847 | if ( isset($this->_part['COUNT']) && $this->_current >= $this->_part['COUNT'] ) // >= since _current is 0-based and COUNT is 1-based |
---|
| 848 | $this->_finished = true; |
---|
| 849 | } |
---|
| 850 | } |
---|
| 851 | |
---|
| 852 | if ( $this->_finished ) { |
---|
| 853 | $next = null; |
---|
| 854 | return $next; |
---|
| 855 | } |
---|
| 856 | |
---|
| 857 | $days = array(); |
---|
| 858 | if ( isset($this->_part['WKST']) ) $next->SetWeekStart($this->_part['WKST']); |
---|
| 859 | if ( $this->_part['FREQ'] == "MONTHLY" ) { |
---|
| 860 | // dbg_error_log( "RRule", " GetNext: Calculating more dates for MONTHLY rule" ); |
---|
| 861 | $limit = 200; |
---|
| 862 | do { |
---|
| 863 | $limit--; |
---|
| 864 | do { |
---|
| 865 | $limit--; |
---|
| 866 | if ( $this->_started ) { |
---|
| 867 | $next->AddMonths($this->_part['INTERVAL']); |
---|
| 868 | } |
---|
| 869 | else { |
---|
| 870 | $this->_started = true; |
---|
| 871 | } |
---|
| 872 | } |
---|
| 873 | while ( isset($this->_part['BYMONTH']) && $limit > 0 && ! $next->TestByMonth($this->_part['BYMONTH']) ); |
---|
| 874 | |
---|
| 875 | if ( isset($this->_part['BYDAY']) ) { |
---|
| 876 | $days = $next->GetMonthByDay($this->_part['BYDAY']); |
---|
| 877 | } |
---|
| 878 | else if ( isset($this->_part['BYMONTHDAY']) ) { |
---|
| 879 | $days = $next->GetMonthByMonthDay($this->_part['BYMONTHDAY']); |
---|
| 880 | } |
---|
| 881 | else |
---|
| 882 | $days[$next->_dd] = $next->_dd; |
---|
| 883 | |
---|
| 884 | if ( isset($this->_part['BYSETPOS']) ) { |
---|
| 885 | $days = $next->ApplyBySetpos($this->_part['BYSETPOS'], $days); |
---|
| 886 | } |
---|
| 887 | |
---|
| 888 | $days = $this->WithinScope( $next, $days); |
---|
| 889 | } |
---|
| 890 | while( $limit && count($days) < 1 && ! $this->_finished ); |
---|
| 891 | // dbg_error_log( "RRule", " GetNext: Found %d days for MONTHLY rule", count($days) ); |
---|
| 892 | |
---|
| 893 | } |
---|
| 894 | else if ( $this->_part['FREQ'] == "WEEKLY" ) { |
---|
| 895 | // dbg_error_log( "RRule", " GetNext: Calculating more dates for WEEKLY rule" ); |
---|
| 896 | $limit = 200; |
---|
| 897 | do { |
---|
| 898 | $limit--; |
---|
| 899 | if ( $this->_started ) { |
---|
| 900 | $next->AddDays($this->_part['INTERVAL'] * 7); |
---|
| 901 | } |
---|
| 902 | else { |
---|
| 903 | $this->_started = true; |
---|
| 904 | } |
---|
| 905 | |
---|
| 906 | if ( isset($this->_part['BYDAY']) ) { |
---|
| 907 | $days = $next->GetWeekByDay($this->_part['BYDAY'], false ); |
---|
| 908 | } |
---|
| 909 | else |
---|
| 910 | $days[$next->_dd] = $next->_dd; |
---|
| 911 | |
---|
| 912 | if ( isset($this->_part['BYSETPOS']) ) { |
---|
| 913 | $days = $next->ApplyBySetpos($this->_part['BYSETPOS'], $days); |
---|
| 914 | } |
---|
| 915 | |
---|
| 916 | $days = $this->WithinScope( $next, $days); |
---|
| 917 | } |
---|
| 918 | while( $limit && count($days) < 1 && ! $this->_finished ); |
---|
| 919 | |
---|
| 920 | // dbg_error_log( "RRule", " GetNext: Found %d days for WEEKLY rule", count($days) ); |
---|
| 921 | } |
---|
| 922 | else if ( $this->_part['FREQ'] == "DAILY" ) { |
---|
| 923 | // dbg_error_log( "RRule", " GetNext: Calculating more dates for DAILY rule" ); |
---|
| 924 | $limit = 100; |
---|
| 925 | do { |
---|
| 926 | $limit--; |
---|
| 927 | if ( $this->_started ) { |
---|
| 928 | $next->AddDays($this->_part['INTERVAL']); |
---|
| 929 | } |
---|
| 930 | |
---|
| 931 | if ( isset($this->_part['BYDAY']) ) { |
---|
| 932 | $days = $next->GetWeekByDay($this->_part['BYDAY'], $this->_started ); |
---|
| 933 | } |
---|
| 934 | else |
---|
| 935 | $days[$next->_dd] = $next->_dd; |
---|
| 936 | |
---|
| 937 | if ( isset($this->_part['BYSETPOS']) ) { |
---|
| 938 | $days = $next->ApplyBySetpos($this->_part['BYSETPOS'], $days); |
---|
| 939 | } |
---|
| 940 | |
---|
| 941 | $days = $this->WithinScope( $next, $days); |
---|
| 942 | $this->_started = true; |
---|
| 943 | } |
---|
| 944 | while( $limit && count($days) < 1 && ! $this->_finished ); |
---|
| 945 | |
---|
| 946 | // dbg_error_log( "RRule", " GetNext: Found %d days for DAILY rule", count($days) ); |
---|
| 947 | } |
---|
| 948 | |
---|
| 949 | $ptr = $this->_current; |
---|
| 950 | foreach( $days AS $k => $v ) { |
---|
| 951 | $this->_dates[$ptr++] = $v; |
---|
| 952 | } |
---|
| 953 | |
---|
| 954 | if ( isset($this->_dates[$this->_current]) ) { |
---|
| 955 | // dbg_error_log( "RRule", " GetNext: Returning %s, (%d'th)", $this->_dates[$this->_current]->Render(), $this->_current ); |
---|
| 956 | return $this->_dates[$this->_current]; |
---|
| 957 | } |
---|
| 958 | else { |
---|
| 959 | // dbg_error_log( "RRule", " GetNext: Returning null date" ); |
---|
| 960 | $next = null; |
---|
| 961 | return $next; |
---|
| 962 | } |
---|
| 963 | } |
---|
| 964 | |
---|
| 965 | } |
---|
| 966 | |
---|