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<?php
define("DF_ALL", -1);
define("DF_NONE", 0);
define("DF_MDY", 1);
define("DF_DMY", 2);
define("DF_YMD", 3);
define("DF_ISO1", 4);
define("DF_LASTPREF", 4);
define("DF_ISO2", 5);
define("DF_YDM", 6);
define("DF_DM", 7);
define("DF_MD", 8);
define("DF_LAST", 8);
# To do: preferences, OutputPage
class DateFormatter
{
var $mSource, $mTarget;
var $monthNames = '', $rxDM, $rxMD, $rxDMY, $rxYDM, $rxMDY, $rxYMD;
var $regexes, $pDays, $pMonths, $pYears;
var $rules, $xMonths;
function DateFormatter()
{
global $wgMonthNamesEn, $wgInputEncoding;
$this->monthNames = $this->getMonthRegex();
for ( $i=1; $i<=12; $i++ ) {
$this->xMonths[strtolower( $wgMonthNamesEn[$i-1] )] = $i;
}
# Attempt at UTF-8 support, untested at the moment
if ( $wgInputEncoding == 'UTF-8' ) {
$this->regexTrail = '(?![a-z])/iu';
} else {
$this->regexTrail = '(?![a-z])/i';
}
# Partial regular expressions
$this->prxDM = '\[\[(\d{1,2})[ _](' . $this->monthNames . ')]]';
$this->prxMD = '\[\[(' . $this->monthNames . ')[ _](\d{1,2})]]';
$this->prxY = '\[\[(\d{1,4}([ _]BC|))]]';
$this->prxISO1 = '\[\[(-?\d{4})]]-\[\[(\d{2})-(\d{2})]]';
$this->prxISO2 = '\[\[(-?\d{4})-(\d{2})-(\d{2})]]';
# Real regular expressions
$this->regexes[DF_DMY] = "/{$this->prxDM} *,? *{$this->prxY}{$this->regexTrail}";
$this->regexes[DF_YDM] = "/{$this->prxY} *,? *{$this->prxDM}{$this->regexTrail}";
$this->regexes[DF_MDY] = "/{$this->prxMD} *,? *{$this->prxY}{$this->regexTrail}";
$this->regexes[DF_YMD] = "/{$this->prxY} *,? *{$this->prxMD}{$this->regexTrail}";
$this->regexes[DF_DM] = "/{$this->prxDM}{$this->regexTrail}";
$this->regexes[DF_MD] = "/{$this->prxMD}{$this->regexTrail}";
$this->regexes[DF_ISO1] = "/{$this->prxISO1}{$this->regexTrail}";
$this->regexes[DF_ISO2] = "/{$this->prxISO2}{$this->regexTrail}";
# Extraction keys
# See the comments in replace() for the meaning of the letters
$this->keys[DF_DMY] = 'jFY';
$this->keys[DF_YDM] = 'Y jF';
$this->keys[DF_MDY] = 'FjY';
$this->keys[DF_YMD] = 'Y Fj';
$this->keys[DF_DM] = 'jF';
$this->keys[DF_MD] = 'Fj';
$this->keys[DF_ISO1] = 'ymd'; # y means ISO year
$this->keys[DF_ISO2] = 'ymd';
# Target date formats
$this->targets[DF_DMY] = '[[F j|j F]] [[Y]]';
$this->targets[DF_YDM] = '[[Y]], [[F j|j F]]';
$this->targets[DF_MDY] = '[[F j]], [[Y]]';
$this->targets[DF_YMD] = '[[Y]] [[F j]]';
$this->targets[DF_DM] = '[[F j|j F]]';
$this->targets[DF_MD] = '[[F j]]';
$this->targets[DF_ISO1] = '[[Y|y]]-[[F j|m-d]]';
$this->targets[DF_ISO2] = '[[y-m-d]]';
# Rules
# pref source target
$this->rules[DF_DMY][DF_MD] = DF_DM;
$this->rules[DF_ALL][DF_MD] = DF_MD;
$this->rules[DF_MDY][DF_DM] = DF_MD;
$this->rules[DF_ALL][DF_DM] = DF_DM;
$this->rules[DF_NONE][DF_ISO2] = DF_ISO1;
}
function reformat( $preference, $text )
{
for ( $i=1; $i<=DF_LAST; $i++ ) {
$this->mSource = $i;
if ( @$this->rules[$preference][$i] ) {
# Specific rules
$this->mTarget = $this->rules[$preference][$i];
} elseif ( @$this->rules[DF_ALL][$i] ) {
# General rules
$this->mTarget = $this->rules[DF_ALL][$i];
} elseif ( $preference ) {
# User preference
$this->mTarget = $preference;
} else {
# Default
$this->mTarget = $i;
}
$text = preg_replace_callback( $this->regexes[$i], 'wfMainDateReplace', $text );
}
return $text;
}
function replace( $matches )
{
global $wgMonthNamesEn;
# Extract information from $matches
$bits = array();
$key = $this->keys[$this->mSource];
for ( $p=0; $p < strlen($key); $p++ ) {
if ( $key{$p} != ' ' ) {
$bits[$key{$p}] = $matches[$p+1];
}
}
$format = $this->targets[$this->mTarget];
# Construct new date
$text = '';
$fail = false;
for ( $p=0; $p < strlen( $format ); $p++ ) {
$char = $format{$p};
switch ( $char ) {
case 'd': # ISO day of month
if ( is_null($bits['d']) ) {
$text .= sprintf( '%02d', $bits['j'] );
} else {
$text .= $bits['d'];
}
break;
case 'm': # ISO month
if ( is_null($bits['m']) ) {
$m = $this->makeIsoMonth( $bits['F'] );
if ( !$m || $m == '00' ) {
$fail = true;
} else {
$text .= $m;
}
} else {
$text .= $bits['m'];
}
break;
case 'y': # ISO year
if ( is_null( $bits['y'] ) ) {
$text .= $this->makeIsoYear( $bits['Y'] );
} else {
$text .= $bits['y'];
}
break;
case 'j': # ordinary day of month
if ( is_null($bits['j']) ) {
$text .= IntVal( $bits['d'] );
} else {
$text .= $bits['j'];
}
break;
case 'F': # long month
if ( is_null( $bits['F'] ) ) {
$m = IntVal($bits['m']);
if ( $m > 12 || $m < 1 ) {
$fail = true;
} else {
$text .= $wgMonthNamesEn[$m-1];
}
} else {
$text .= ucfirst( $bits['F'] );
}
break;
case 'Y': # ordinary (optional BC) year
if ( is_null( $bits['Y'] ) ) {
$text .= $this->makeNormalYear( $bits['y'] );
} else {
$text .= $bits['Y'];
}
break;
default:
$text .= $char;
}
}
if ( $fail ) {
$text = $matches[0];
}
return $text;
}
function getMonthRegex()
{
global $wgMonthNamesEn;
return implode( '|', $wgMonthNamesEn );
}
# Makes an ISO month, e.g. 02, from a month name
function makeIsoMonth( $monthName )
{
$n = $this->xMonths[strtolower( $monthName )];
return sprintf( '%02d', $n );
}
function makeIsoYear( $year )
{
# Assumes the year is in a nice format, as enforced by the regex
if ( substr( $year, -2 ) == 'BC' ) {
$num = IntVal(substr( $year, 0, -3 )) - 1;
# PHP bug note: sprintf( "%04d", -1 ) fails poorly
$text = sprintf( '-%04d', $num );
} else {
$text = sprintf( '%04d', $year );
}
return $text;
}
function makeNormalYear( $iso )
{
if ( $iso{0} == '-' ) {
$text = (IntVal( substr( $iso, 1 ) ) - 1) . ' BC';
} else {
$text = IntVal( $iso );
}
return $text;
}
}
function wfMainDateReplace( $matches )
{
global $wgDateFormatter;
return $wgDateFormatter->replace( $matches );
}
?>
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