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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Storage;
use MediaWiki\Content\Content;
use MediaWiki\Revision\MutableRevisionSlots;
use MediaWiki\Revision\RevisionAccessException;
use MediaWiki\Revision\RevisionSlots;
use MediaWiki\Revision\SlotRecord;
/**
* Value object representing a modification of revision slots.
*
* @since 1.32
*/
class RevisionSlotsUpdate {
/**
* @var SlotRecord[] modified slots, using the slot role as the key.
*/
private $modifiedSlots = [];
/**
* @var bool[] removed roles, stored in the keys of the array.
*/
private $removedRoles = [];
/**
* Constructs a RevisionSlotsUpdate representing the update that turned $parentSlots
* into $newSlots. If $parentSlots is not given, $newSlots is assumed to come from a
* page's first revision.
*
* @param RevisionSlots $newSlots
* @param RevisionSlots|null $parentSlots
*
* @return RevisionSlotsUpdate
*/
public static function newFromRevisionSlots(
RevisionSlots $newSlots,
?RevisionSlots $parentSlots = null
) {
$modified = $newSlots->getSlots();
$removed = [];
if ( $parentSlots ) {
foreach ( $parentSlots->getSlots() as $role => $slot ) {
if ( !isset( $modified[$role] ) ) {
$removed[] = $role;
} elseif ( $slot->hasSameContent( $modified[$role] ) ) {
// Unset slots that had the same content in the parent revision from $modified.
unset( $modified[$role] );
}
}
}
return new RevisionSlotsUpdate( $modified, $removed );
}
/**
* Constructs a RevisionSlotsUpdate representing the update of $parentSlots
* when changing $newContent. If a slot has the same content in $newContent
* as in $parentSlots, that slot is considered inherited and thus omitted from
* the resulting RevisionSlotsUpdate.
*
* In contrast to newFromRevisionSlots(), slots in $parentSlots that are not present
* in $newContent are not considered removed. They are instead assumed to be inherited.
*
* @param Content[] $newContent The new content, using slot roles as array keys.
* @param RevisionSlots|null $parentSlots
*
* @return RevisionSlotsUpdate
*/
public static function newFromContent( array $newContent, ?RevisionSlots $parentSlots = null ) {
$modified = [];
foreach ( $newContent as $role => $content ) {
$slot = SlotRecord::newUnsaved( $role, $content );
if ( $parentSlots
&& $parentSlots->hasSlot( $role )
&& $slot->hasSameContent( $parentSlots->getSlot( $role ) )
) {
// Skip slots that had the same content in the parent revision from $modified.
continue;
}
$modified[$role] = $slot;
}
return new RevisionSlotsUpdate( $modified );
}
/**
* @param SlotRecord[] $modifiedSlots
* @param string[] $removedRoles
*/
public function __construct( array $modifiedSlots = [], array $removedRoles = [] ) {
foreach ( $modifiedSlots as $slot ) {
$this->modifySlot( $slot );
}
foreach ( $removedRoles as $role ) {
$this->removeSlot( $role );
}
}
/**
* Returns a list of modified slot roles, that is, roles modified by calling modifySlot(),
* and not later removed by calling removeSlot().
*
* Note that slots in modified roles may still be inherited slots. This is for instance
* the case when the RevisionSlotsUpdate objects represents some kind of rollback
* operation, in which slots that existed in an earlier revision are restored in
* a new revision.
*
* @return string[]
*/
public function getModifiedRoles() {
return array_keys( $this->modifiedSlots );
}
/**
* Returns a list of removed slot roles, that is, roles removed by calling removeSlot(),
* and not later re-introduced by calling modifySlot().
*
* @return string[]
*/
public function getRemovedRoles() {
return array_keys( $this->removedRoles );
}
/**
* Returns a list of all slot roles that modified or removed.
*
* @return string[]
*/
public function getTouchedRoles() {
return array_merge( $this->getModifiedRoles(), $this->getRemovedRoles() );
}
/**
* Sets the given slot to be modified.
* If a slot with the same role is already present, it is replaced.
*
* The roles used with modifySlot() will be returned from getModifiedRoles(),
* unless overwritten with removeSlot().
*/
public function modifySlot( SlotRecord $slot ) {
$role = $slot->getRole();
// XXX: We should perhaps require this to be an unsaved slot!
unset( $this->removedRoles[$role] );
$this->modifiedSlots[$role] = $slot;
}
/**
* Sets the content for the slot with the given role to be modified.
* If a slot with the same role is already present, it is replaced.
*
* @param string $role
* @param Content $content
*/
public function modifyContent( $role, Content $content ) {
$slot = SlotRecord::newUnsaved( $role, $content );
$this->modifySlot( $slot );
}
/**
* Remove the slot for the given role, discontinue the corresponding stream.
*
* The roles used with removeSlot() will be returned from getRemovedSlots(),
* unless overwritten with modifySlot().
*
* @param string $role
*/
public function removeSlot( $role ) {
unset( $this->modifiedSlots[$role] );
$this->removedRoles[$role] = true;
}
/**
* Returns the SlotRecord associated with the given role, if the slot with that role
* was modified (and not again removed).
*
* @note If the SlotRecord returned by this method returns a non-inherited slot,
* the content of that slot may or may not already have PST applied. Methods
* that take a RevisionSlotsUpdate as a parameter should specify whether they
* expect PST to already have been applied to all slots. Inherited slots
* should never have PST applied again.
*
* @param string $role The role name of the desired slot
*
* @throws RevisionAccessException if the slot does not exist or was removed.
* @return SlotRecord
*/
public function getModifiedSlot( $role ) {
if ( isset( $this->modifiedSlots[$role] ) ) {
return $this->modifiedSlots[$role];
} else {
throw new RevisionAccessException(
'No such slot: {role}',
[ 'role' => $role ]
);
}
}
/**
* Returns whether getModifiedSlot() will return a SlotRecord for the given role.
*
* Will return true for the role names returned by getModifiedRoles(), false otherwise.
*
* @param string $role The role name of the desired slot
*
* @return bool
*/
public function isModifiedSlot( $role ) {
return isset( $this->modifiedSlots[$role] );
}
/**
* Returns whether the given role is to be removed from the page.
*
* Will return true for the role names returned by getRemovedRoles(), false otherwise.
*
* @param string $role The role name of the desired slot
*
* @return bool
*/
public function isRemovedSlot( $role ) {
return isset( $this->removedRoles[$role] );
}
/**
* Returns true if $other represents the same update - that is,
* if all methods defined by RevisionSlotsUpdate when called on $this or $other
* will yield the same result when called with the same parameters.
*
* SlotRecords for the same role are compared based on their model and content.
*
* @param RevisionSlotsUpdate $other
* @return bool
*/
public function hasSameUpdates( RevisionSlotsUpdate $other ) {
// NOTE: use != not !==, since the order of entries is not significant!
if ( $this->getModifiedRoles() != $other->getModifiedRoles() ) {
return false;
}
if ( $this->getRemovedRoles() != $other->getRemovedRoles() ) {
return false;
}
foreach ( $this->getModifiedRoles() as $role ) {
$s = $this->getModifiedSlot( $role );
$t = $other->getModifiedSlot( $role );
if ( !$s->hasSameContent( $t ) ) {
return false;
}
}
return true;
}
/**
* Applies this update to the given MutableRevisionSlots, setting all modified slots,
* and removing all removed roles.
*/
public function apply( MutableRevisionSlots $slots ) {
foreach ( $this->getModifiedRoles() as $role ) {
$slots->setSlot( $this->getModifiedSlot( $role ) );
}
foreach ( $this->getRemovedRoles() as $role ) {
$slots->removeSlot( $role );
}
}
}