includes/DateFormatter.php

   1 <?php
   2 /**
   3  * Date formatter, recognises dates in plain text and formats them accoding to user preferences.
   4  *
   5  * @package MediaWiki
   6  * @subpackage Parser
   7  */
   8
   9 /**
  10  * @todo preferences, OutputPage
  11  * @package MediaWiki
  12  * @subpackage Parser
  13  */
  14 class DateFormatter
  15 {
  16         var $mSource, $mTarget;
  17         var $monthNames = '', $rxDM, $rxMD, $rxDMY, $rxYDM, $rxMDY, $rxYMD;
  18
  19         var $regexes, $pDays, $pMonths, $pYears;
  20         var $rules, $xMonths;
  21
  22         const ALL = -1;
  23         const NONE = 0;
  24         const MDY = 1;
  25         const DMY = 2;
  26         const YMD = 3;
  27         const ISO1 = 4;
  28         const LASTPREF = 4;
  29         const ISO2 = 5;
  30         const YDM = 6;
  31         const DM = 7;
  32         const MD = 8;
  33         const LAST = 8;
  34
  35         /**
  36          * @todo document
  37          */
  38         function DateFormatter() {
  39                 global $wgContLang;
  40
  41                 $this->monthNames = $this->getMonthRegex();
  42                 for ( $i=1; $i<=12; $i++ ) {
  43                         $this->xMonths[$wgContLang->lc( $wgContLang->getMonthName( $i ) )] = $i;
  44                         $this->xMonths[$wgContLang->lc( $wgContLang->getMonthAbbreviation( $i ) )] = $i;
  45                 }
  46
  47                 $this->regexTrail = '(?![a-z])/iu';
  48
  49                 # Partial regular expressions
  50                 $this->prxDM = '\[\[(\d{1,2})[ _](' . $this->monthNames . ')]]';
  51                 $this->prxMD = '\[\[(' . $this->monthNames . ')[ _](\d{1,2})]]';
  52                 $this->prxY = '\[\[(\d{1,4}([ _]BC|))]]';
  53                 $this->prxISO1 = '\[\[(-?\d{4})]]-\[\[(\d{2})-(\d{2})]]';
  54                 $this->prxISO2 = '\[\[(-?\d{4})-(\d{2})-(\d{2})]]';
  55
  56                 # Real regular expressions
  57                 $this->regexes[self::DMY] = "/{$this->prxDM} *,? *{$this->prxY}{$this->regexTrail}";
  58                 $this->regexes[self::YDM] = "/{$this->prxY} *,? *{$this->prxDM}{$this->regexTrail}";
  59                 $this->regexes[self::MDY] = "/{$this->prxMD} *,? *{$this->prxY}{$this->regexTrail}";
  60                 $this->regexes[self::YMD] = "/{$this->prxY} *,? *{$this->prxMD}{$this->regexTrail}";
  61                 $this->regexes[self::DM] = "/{$this->prxDM}{$this->regexTrail}";
  62                 $this->regexes[self::MD] = "/{$this->prxMD}{$this->regexTrail}";
  63                 $this->regexes[self::ISO1] = "/{$this->prxISO1}{$this->regexTrail}";
  64                 $this->regexes[self::ISO2] = "/{$this->prxISO2}{$this->regexTrail}";
  65
  66                 # Extraction keys
  67                 # See the comments in replace() for the meaning of the letters
  68                 $this->keys[self::DMY] = 'jFY';
  69                 $this->keys[self::YDM] = 'Y jF';
  70                 $this->keys[self::MDY] = 'FjY';
  71                 $this->keys[self::YMD] = 'Y Fj';
  72                 $this->keys[self::DM] = 'jF';
  73                 $this->keys[self::MD] = 'Fj';
  74                 $this->keys[self::ISO1] = 'ymd'; # y means ISO year
  75                 $this->keys[self::ISO2] = 'ymd';
  76
  77                 # Target date formats
  78                 $this->targets[self::DMY] = '[[F j|j F]] [[Y]]';
  79                 $this->targets[self::YDM] = '[[Y]], [[F j|j F]]';
  80                 $this->targets[self::MDY] = '[[F j]], [[Y]]';
  81                 $this->targets[self::YMD] = '[[Y]] [[F j]]';
  82                 $this->targets[self::DM] = '[[F j|j F]]';
  83                 $this->targets[self::MD] = '[[F j]]';
  84                 $this->targets[self::ISO1] = '[[Y|y]]-[[F j|m-d]]';
  85                 $this->targets[self::ISO2] = '[[y-m-d]]';
  86
  87                 # Rules
  88                 #            pref    source       target
  89                 $this->rules[self::DMY][self::MD]       = self::DM;
  90                 $this->rules[self::ALL][self::MD]       = self::MD;
  91                 $this->rules[self::MDY][self::DM]       = self::MD;
  92                 $this->rules[self::ALL][self::DM]       = self::DM;
  93                 $this->rules[self::NONE][self::ISO2]    = self::ISO1;
  94         }
  95
  96         /**
  97          * @static
  98          */
  99         function &getInstance() {
 100                 global $wgDBname, $wgMemc;
 101                 static $dateFormatter = false;
 102                 if ( !$dateFormatter ) {
 103                         $dateFormatter = $wgMemc->get( "$wgDBname:dateformatter" );
 104                         if ( !$dateFormatter ) {
 105                                 $dateFormatter = new DateFormatter;
 106                                 $wgMemc->set( "$wgDBname:dateformatter", $dateFormatter, 3600 );
 107                         }
 108                 }
 109                 return $dateFormatter;
 110         }
 111
 112         /**
 113          * @param $preference
 114          * @param $text
 115          */
 116         function reformat( $preference, $text ) {
 117                 if ($preference == 'ISO 8601') $preference = 4; # The ISO 8601 option used to be 4
 118                 for ( $i=1; $i<=self::LAST; $i++ ) {
 119                         $this->mSource = $i;
 120                         if ( @$this->rules[$preference][$i] ) {
 121                                 # Specific rules
 122                                 $this->mTarget = $this->rules[$preference][$i];
 123                         } elseif ( @$this->rules[self::ALL][$i] ) {
 124                                 # General rules
 125                                 $this->mTarget = $this->rules[self::ALL][$i];
 126                         } elseif ( $preference ) {
 127                                 # User preference
 128                                 $this->mTarget = $preference;
 129                         } else {
 130                                 # Default
 131                                 $this->mTarget = $i;
 132                         }
 133                         $text = preg_replace_callback( $this->regexes[$i], array( &$this, 'replace' ), $text );
 134                 }
 135                 return $text;
 136         }
 137
 138         /**
 139          * @param $matches
 140          */
 141         function replace( $matches ) {
 142                 # Extract information from $matches
 143                 $bits = array();
 144                 $key = $this->keys[$this->mSource];
 145                 for ( $p=0; $p < strlen($key); $p++ ) {
 146                         if ( $key{$p} != ' ' ) {
 147                                 $bits[$key{$p}] = $matches[$p+1];
 148                         }
 149                 }
 150
 151                 $format = $this->targets[$this->mTarget];
 152
 153                 # Construct new date
 154                 $text = '';
 155                 $fail = false;
 156
 157                 for ( $p=0; $p < strlen( $format ); $p++ ) {
 158                         $char = $format{$p};
 159                         switch ( $char ) {
 160                                 case 'd': # ISO day of month
 161                                         if ( !isset($bits['d']) ) {
 162                                                 $text .= sprintf( '%02d', $bits['j'] );
 163                                         } else {
 164                                                 $text .= $bits['d'];
 165                                         }
 166                                         break;
 167                                 case 'm': # ISO month
 168                                         if ( !isset($bits['m']) ) {
 169                                                 $m = $this->makeIsoMonth( $bits['F'] );
 170                                                 if ( !$m || $m == '00' ) {
 171                                                         $fail = true;
 172                                                 } else {
 173                                                         $text .= $m;
 174                                                 }
 175                                         } else {
 176                                                 $text .= $bits['m'];
 177                                         }
 178                                         break;
 179                                 case 'y': # ISO year
 180                                         if ( !isset( $bits['y'] ) ) {
 181                                                 $text .= $this->makeIsoYear( $bits['Y'] );
 182                                         } else {
 183                                                 $text .= $bits['y'];
 184                                         }
 185                                         break;
 186                                 case 'j': # ordinary day of month
 187                                         if ( !isset($bits['j']) ) {
 188                                                 $text .= intval( $bits['d'] );
 189                                         } else {
 190                                                 $text .= $bits['j'];
 191                                         }
 192                                         break;
 193                                 case 'F': # long month
 194                                         if ( !isset( $bits['F'] ) ) {
 195                                                 $m = intval($bits['m']);
 196                                                 if ( $m > 12 || $m < 1 ) {
 197                                                         $fail = true;
 198                                                 } else {
 199                                                         global $wgContLang;
 200                                                         $text .= $wgContLang->getMonthName( $m );
 201                                                 }
 202                                         } else {
 203                                                 $text .= ucfirst( $bits['F'] );
 204                                         }
 205                                         break;
 206                                 case 'Y': # ordinary (optional BC) year
 207                                         if ( !isset( $bits['Y'] ) ) {
 208                                                 $text .= $this->makeNormalYear( $bits['y'] );
 209                                         } else {
 210                                                 $text .= $bits['Y'];
 211                                         }
 212                                         break;
 213                                 default:
 214                                         $text .= $char;
 215                         }
 216                 }
 217                 if ( $fail ) {
 218                         $text = $matches[0];
 219                 }
 220                 return $text;
 221         }
 222
 223         /**
 224          * @todo document
 225          */
 226         function getMonthRegex() {
 227                 global $wgContLang;
 228                 $names = array();
 229                 for( $i = 1; $i <= 12; $i++ ) {
 230                         $names[] = $wgContLang->getMonthName( $i );
 231                         $names[] = $wgContLang->getMonthAbbreviation( $i );
 232                 }
 233                 return implode( '|', $names );
 234         }
 235
 236         /**
 237          * Makes an ISO month, e.g. 02, from a month name
 238          * @param $monthName String: month name
 239          * @return string ISO month name
 240          */
 241         function makeIsoMonth( $monthName ) {
 242                 global $wgContLang;
 243
 244                 $n = $this->xMonths[$wgContLang->lc( $monthName )];
 245                 return sprintf( '%02d', $n );
 246         }
 247
 248         /**
 249          * @todo document
 250          * @param $year String: Year name
 251          * @return string ISO year name
 252          */
 253         function makeIsoYear( $year ) {
 254                 # Assumes the year is in a nice format, as enforced by the regex
 255                 if ( substr( $year, -2 ) == 'BC' ) {
 256                         $num = intval(substr( $year, 0, -3 )) - 1;
 257                         # PHP bug note: sprintf( "%04d", -1 ) fails poorly
 258                         $text = sprintf( '-%04d', $num );
 259
 260                 } else {
 261                         $text = sprintf( '%04d', $year );
 262                 }
 263                 return $text;
 264         }
 265
 266         /**
 267          * @todo document
 268          */
 269         function makeNormalYear( $iso ) {
 270                 if ( $iso{0} == '-' ) {
 271                         $text = (intval( substr( $iso, 1 ) ) + 1) . ' BC';
 272                 } else {
 273                         $text = intval( $iso );
 274                 }
 275                 return $text;
 276         }
 277 }
 278
 279 ?>