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<?php
namespace Cite;
use LogicException;
use MediaWiki\Parser\StripState;
/**
* Encapsulates most of Cite state during parsing. This includes metadata about each ref tag,
* and a rollback stack to correct confusion caused by lost context when `{{#tag` is used.
*
* @license GPL-2.0-or-later
*/
class ReferenceStack {
/**
* Data structure representing all <ref> tags parsed so far, indexed by group name (an empty
* string for the default group) and reference name.
*
* References without a name get a numeric index, starting from 0. Conflicts are avoided by
* disallowing numeric names (e.g. <ref name="1">) in {@see Validator::validateRef}.
*
* @var array<string,array<string|int,ReferenceStackItem>>
*/
private array $refs = [];
/**
* Global, auto-incrementing sequence number for all <ref>, no matter which group, starting
* from 1. Reflects the total number of <ref>.
*/
private int $refSequence = 0;
/**
* @var array<string,int> Auto-incrementing sequence numbers per group, starting from 1.
* Reflects the current number of <ref> in each group.
*/
private array $groupRefSequence = [];
/**
* <ref> call stack
* Used to cleanup out of sequence ref calls created by #tag
* See description of function rollbackRef.
*
* @var (array{0: string, 1: ReferenceStackItem, 2: ?string, 3: array}|false)[] Non-false
* entries are parameters for the {@see rollbackRef} function
*/
private array $refCallStack = [];
private const ACTION_INCREMENT = 'increment';
private const ACTION_NEW = 'new';
/**
* Leave a mark in the stack which matches an invalid ref tag.
*/
public function pushInvalidRef(): void {
$this->refCallStack[] = false;
}
/**
* Populate $this->refs and $this->refCallStack based on input and arguments to <ref>
*
* @param StripState $stripState
* @param ?string $text Content from the <ref> tag
* @param array $argv
* @param string $group
* @param ?string $name
* @param ?string $follow Guaranteed to not be a numeric string
* @param ?string $dir ref direction
* @param ?string $subrefDetails subreference details
*
* @return ?ReferenceStackItem ref to render at the site of usage, or null
* if no footnote marker should be rendered
*/
public function pushRef(
StripState $stripState,
?string $text,
array $argv,
string $group,
?string $name,
?string $follow,
?string $dir,
?string $subrefDetails = null
): ?ReferenceStackItem {
$this->refs[$group] ??= [];
$this->groupRefSequence[$group] ??= 0;
$ref = new ReferenceStackItem();
$ref->count = 1;
$ref->dir = $dir;
$ref->group = $group;
$ref->name = $name ?: null;
$ref->text = $text;
if ( $follow ) {
if ( !isset( $this->refs[$group][$follow] ) ) {
// Mark an incomplete follow="…" as such. This is valid e.g. in the Page:… namespace
// on Wikisource.
$ref->follow = $follow;
$ref->globalId = $this->nextRefSequence();
$this->refs[$group][$ref->globalId] = $ref;
$this->refCallStack[] = [ self::ACTION_NEW, $ref, $text, $argv ];
} elseif ( $text !== null ) {
// We know the parent already, so just perform the follow="…" and bail out
$this->resolveFollow( $group, $follow, $text );
}
// A follow="…" never gets its own footnote marker
return null;
}
if ( $name && isset( $this->refs[$group][$name] ) ) {
// A named <ref> is reused, possibly with more information than before
$ref = &$this->refs[$group][$name];
$ref->count++;
if ( $ref->dir && $dir && $ref->dir !== $dir ) {
$ref->warnings[] = [ 'cite_error_ref_conflicting_dir', $name ];
}
if ( $ref->text === null && $text !== null ) {
// If no text was set before, use this text
$ref->text = $text;
// Use the dir parameter only from the full definition of a named ref tag
$ref->dir = $dir;
} else {
if ( $text !== null
// T205803 different strip markers might hide the same text
&& $stripState->unstripBoth( $text )
!== $stripState->unstripBoth( $ref->text )
) {
// Two <ref> with same group and name, but different content
$ref->warnings[] = [ 'cite_error_references_duplicate_key', $name ];
}
}
$action = self::ACTION_INCREMENT;
} else {
// First occurrence of a named <ref>, or an unnamed <ref>
$ref->globalId = $this->nextRefSequence();
$this->refs[$group][$name ?: $ref->globalId] = &$ref;
$action = self::ACTION_NEW;
}
$ref->numberInGroup ??= ++$this->groupRefSequence[$group];
if ( ( $subrefDetails ?? '' ) !== '' ) {
$parentRef = $ref;
// Turns out this is not a reused parent; undo parts of what happened above
$parentRef->count--;
// Make a clone of the sub-reference before we start manipulating the parent
unset( $ref );
$ref = clone $parentRef;
$parentRef->subrefCount ??= 0;
// FIXME: At the moment it's impossible to reuse sub-references in any way
$ref->count = 1;
$ref->globalId = $this->nextRefSequence();
$ref->name = null;
$ref->hasMainRef = $parentRef;
$ref->subrefIndex = ++$parentRef->subrefCount;
$ref->text = $subrefDetails;
// No need to duplicate errors that are already shown on the parent
$ref->warnings = [];
$this->refs[$group][$ref->globalId] = $ref;
}
$this->refCallStack[] = [ $action, $ref, $text, $argv ];
return $ref;
}
/**
* Undo the changes made by the last $count ref tags. This is used when we discover that the
* last few tags were actually inside of a references tag.
*
* @param int $count Number of <ref> tags already parsed and replaced with strip-markers before
* we realized we are actually inside {{#tag:references|…}}.
* @return array{0: ?string, 1: array}[] Refs to restore under the correct context, as a list
* of [ $text, $argv ]
*/
public function rollbackRefs( int $count ): array {
$redoStack = [];
while ( $count-- && $this->refCallStack ) {
$call = array_pop( $this->refCallStack );
if ( $call ) {
/** @var ReferenceStackItem $ref */
$ref = $call[1];
if ( $ref->hasMainRef ) {
// Must drop the sub-ref completely; undoing and redoing the main re-creates it
$this->rollbackRef( self::ACTION_NEW, $ref, null, [] );
$call[1] = $ref->hasMainRef;
}
// @phan-suppress-next-line PhanParamTooFewUnpack
$redoStack[] = $this->rollbackRef( ...$call );
}
}
// Drop unused rollbacks, this group is finished.
$this->refCallStack = [];
return array_reverse( $redoStack );
}
/**
* Partially undoes the effect of calls to stack()
*
* The option to define <ref> within <references> makes the
* behavior of <ref> context dependent. This is normally fine
* but certain operations (especially #tag) lead to out-of-order
* parser evaluation with the <ref> tags being processed before
* their containing <reference> element is read. This leads to
* stack corruption that this function works to fix.
*
* This function is not a total rollback since some internal
* counters remain incremented. Doing so prevents accidentally
* corrupting certain links.
*
* @param string $action
* @param ReferenceStackItem $ref
* @param ?string $text
* @param array $argv
* @return array{0: ?string, 1: array} [ $text, $argv ] Ref redo item.
*/
private function rollbackRef(
string $action,
ReferenceStackItem $ref,
?string $text,
array $argv
): array {
switch ( $action ) {
case self::ACTION_NEW:
// Rollback the addition of new elements to the stack
$group = $ref->group;
$i = array_search( $ref, $this->refs[$group], true );
unset( $this->refs[$group][$i] );
if ( !$this->refs[$group] ) {
$this->popGroup( $group );
} elseif ( isset( $this->groupRefSequence[$group] ) ) {
$this->groupRefSequence[$group]--;
}
break;
case self::ACTION_INCREMENT:
// Rollback increase in named ref occurrences
$ref->count--;
break;
default:
throw new LogicException( "Unknown call stack action \"$action\"" );
}
return [ $text, $argv ];
}
/**
* Clear state for a single group.
*
* @param string $group
*
* @return array<string|int,ReferenceStackItem> The references from the removed group
*/
public function popGroup( string $group ): array {
$refs = $this->getGroupRefs( $group );
unset( $this->refs[$group] );
unset( $this->groupRefSequence[$group] );
return $refs;
}
/**
* Returns true if the group exists and contains references.
*/
public function hasGroup( string $group ): bool {
return (bool)( $this->refs[$group] ?? null );
}
public function isKnown( ?string $group, ?string $name ): bool {
return $name && isset( $this->refs[$group ?? Cite::DEFAULT_GROUP][$name] );
}
/**
* @return string[] List of group names that contain at least one reference
*/
public function getGroups(): array {
$groups = [];
foreach ( $this->refs as $group => $refs ) {
if ( $refs ) {
$groups[] = $group;
}
}
return $groups;
}
/**
* Return all references for a group.
*
* @param string $group
*
* @return array<string|int,ReferenceStackItem>
*/
public function getGroupRefs( string $group ): array {
return $this->refs[$group] ?? [];
}
private function resolveFollow( string $group, string $follow, string $text ): void {
$previousRef =& $this->refs[$group][$follow];
$previousRef->text ??= '';
$previousRef->text .= " $text";
}
public function listDefinedRef( string $group, string $name, ?string $text ): ReferenceStackItem {
$ref =& $this->refs[$group][$name];
$ref ??= new ReferenceStackItem();
if ( $ref->text === null ) {
$ref->text = $text;
} elseif ( $text !== null && $ref->text !== $text ) {
// Two <ref> with same group and name, but different content
$ref->warnings[] = [ 'cite_error_references_duplicate_key', $name ];
}
return $ref;
}
private function nextRefSequence(): int {
return ++$this->refSequence;
}
}