mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-28 10:11:45 +00:00
1254 lines
41 KiB
PHP
1254 lines
41 KiB
PHP
<?php
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namespace MediaWiki\Extension\DiscussionTools;
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use Config;
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use DateInterval;
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use DateTime;
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use DateTimeImmutable;
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use DateTimeZone;
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use Language;
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use MediaWiki\MediaWikiServices;
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use MWException;
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use Title;
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use Wikimedia\IPUtils;
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use Wikimedia\Parsoid\DOM\Element;
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use Wikimedia\Parsoid\DOM\Node;
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use Wikimedia\Parsoid\DOM\Text;
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// TODO clean up static vs non-static
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// TODO consider making timestamp parsing not a returned function
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class CommentParser {
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private const SIGNATURE_SCAN_LIMIT = 100;
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/** @var Element */
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private $rootNode;
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/** @var Title */
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private $title;
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/** @var ThreadItem[] */
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private $threadItems;
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/** @var CommentItem[] */
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private $commentItems;
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/** @var ThreadItem[][] */
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private $threadItemsByName;
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/** @var ThreadItem[] */
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private $threadItemsById;
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/** @var HeadingItem[] */
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private $threads;
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/** @var Config */
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private $config;
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/** @var Language */
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private $language;
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private $dateFormat;
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private $digits;
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/** @var string[][] */
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private $contLangMessages;
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private $localTimezone;
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private $timezones;
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/**
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* @param Element $rootNode Root node of content to parse
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* @param Title $title Title of the page being parsed
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* @param Language $language Content language
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* @param Config $config
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* @param array $data
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*/
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public function __construct(
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Element $rootNode, Title $title, Language $language, Config $config, array $data = []
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) {
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$this->rootNode = $rootNode;
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$this->config = $config;
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$this->language = $language;
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$this->title = $title;
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if ( !$data ) {
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// TODO: Instead of passing data used for mocking, mock the methods that fetch the data.
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$data = Data::getLocalData( null, $config, $language );
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}
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$this->dateFormat = $data['dateFormat'];
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$this->digits = $data['digits'];
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$this->contLangMessages = $data['contLangMessages'];
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$this->localTimezone = $data['localTimezone'];
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$this->timezones = $data['timezones'];
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}
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/**
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* @param Element $rootNode
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* @param Title $title
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* @return CommentParser
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*/
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public static function newFromGlobalState( Element $rootNode, Title $title ): CommentParser {
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return new static(
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$rootNode,
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$title,
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MediaWikiServices::getInstance()->getContentLanguage(),
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MediaWikiServices::getInstance()->getMainConfig()
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);
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}
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/**
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* Return the next leaf node in the tree order that is likely a part of a discussion comment,
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* rather than some boring "separator" element.
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*
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* Currently, this can return a Text node with content other than whitespace, or an Element node
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* that is a "void element" or "text element", except some special cases that we treat as comment
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* separators (isCommentSeparator()).
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*
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* @param Node $node Node to start searching at. This node's children are ignored.
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* @return Node
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*/
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private function nextInterestingLeafNode( Node $node ): Node {
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$rootNode = $this->rootNode;
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$treeWalker = new TreeWalker(
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$rootNode,
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NodeFilter::SHOW_ELEMENT | NodeFilter::SHOW_TEXT,
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static function ( $n ) use ( $node, $rootNode ) {
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// Ignore this node and its descendants
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// (unless it's the root node, this is a special case for "fakeHeading" handling)
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if ( $node !== $rootNode && ( $n === $node || $n->parentNode === $node ) ) {
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return NodeFilter::FILTER_REJECT;
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}
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// Ignore some elements usually used as separators or headers (and their descendants)
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if ( CommentUtils::isCommentSeparator( $n ) ) {
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return NodeFilter::FILTER_REJECT;
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}
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// Ignore nodes with no rendering that mess up our indentation detection
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if ( CommentUtils::isRenderingTransparentNode( $n ) ) {
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return NodeFilter::FILTER_REJECT;
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}
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if ( CommentUtils::isCommentContent( $n ) ) {
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return NodeFilter::FILTER_ACCEPT;
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}
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return NodeFilter::FILTER_SKIP;
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}
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);
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$treeWalker->currentNode = $node;
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$treeWalker->nextNode();
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if ( !$treeWalker->currentNode ) {
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throw new MWException( 'nextInterestingLeafNode not found' );
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}
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return $treeWalker->currentNode;
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}
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/**
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* @param string[] $values Values to match
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* @return string Regular expression
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*/
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private static function regexpAlternateGroup( array $values ): string {
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return '(' . implode( '|', array_map( static function ( string $x ) {
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return preg_quote( $x, '/' );
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}, $values ) ) . ')';
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}
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/**
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* Get text of localisation messages in content language.
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*
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* @param string $contLangVariant Content language variant
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* @param string[] $messages Message keys
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* @return string[] Message values
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*/
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private function getMessages( string $contLangVariant, array $messages ): array {
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return array_map( function ( string $key ) use ( $contLangVariant ) {
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return $this->contLangMessages[$contLangVariant][$key];
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}, $messages );
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}
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/**
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* Get a regexp that matches timestamps generated using the given date format.
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*
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* This only supports format characters that are used by the default date format in any of
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* MediaWiki's languages, namely: D, d, F, G, H, i, j, l, M, n, Y, xg, xkY (and escape characters),
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* and only dates when MediaWiki existed, let's say 2000 onwards (Thai dates before 1941 are
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* complicated).
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*
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* @param string $contLangVariant Content language variant
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* @param string $format Date format
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* @param string $digitsRegexp Regular expression matching a single localised digit, e.g. '[0-9]'
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* @param array $tzAbbrs Associative array mapping localised timezone abbreviations to
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* IANA abbreviations, for the local timezone, e.g. [ 'EDT' => 'EDT', 'EST' => 'EST' ]
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* @return string Regular expression
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*/
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private function getTimestampRegexp(
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string $contLangVariant, string $format, string $digitsRegexp, array $tzAbbrs
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): string {
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$formatLength = strlen( $format );
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$s = '';
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// Adapted from Language::sprintfDate()
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for ( $p = 0; $p < $formatLength; $p++ ) {
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$num = false;
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$code = $format[ $p ];
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if ( $code === 'x' && $p < $formatLength - 1 ) {
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$code .= $format[++$p];
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}
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if ( $code === 'xk' && $p < $formatLength - 1 ) {
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$code .= $format[++$p];
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}
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switch ( $code ) {
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case 'xx':
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$s .= 'x';
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break;
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case 'xg':
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$s .= self::regexpAlternateGroup(
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$this->getMessages( $contLangVariant, Language::MONTH_GENITIVE_MESSAGES )
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);
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break;
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case 'd':
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$num = '2';
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break;
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case 'D':
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$s .= self::regexpAlternateGroup(
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$this->getMessages( $contLangVariant, Language::WEEKDAY_ABBREVIATED_MESSAGES )
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);
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break;
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case 'j':
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$num = '1,2';
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break;
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case 'l':
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$s .= self::regexpAlternateGroup(
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$this->getMessages( $contLangVariant, Language::WEEKDAY_MESSAGES )
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);
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break;
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case 'F':
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$s .= self::regexpAlternateGroup(
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$this->getMessages( $contLangVariant, Language::MONTH_MESSAGES )
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);
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break;
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case 'M':
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$s .= self::regexpAlternateGroup(
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$this->getMessages( $contLangVariant, Language::MONTH_ABBREVIATED_MESSAGES )
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);
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break;
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case 'n':
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$num = '1,2';
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break;
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case 'Y':
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$num = '4';
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break;
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case 'xkY':
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$num = '4';
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break;
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case 'G':
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$num = '1,2';
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break;
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case 'H':
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$num = '2';
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break;
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case 'i':
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$num = '2';
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break;
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case '\\':
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// Backslash escaping
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if ( $p < $formatLength - 1 ) {
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$s .= preg_quote( $format[++$p], '/' );
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} else {
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$s .= preg_quote( '\\', '/' );
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}
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break;
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case '"':
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// Quoted literal
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if ( $p < $formatLength - 1 ) {
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$endQuote = strpos( $format, '"', $p + 1 );
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if ( $endQuote === false ) {
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// No terminating quote, assume literal "
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$s .= '"';
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} else {
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$s .= preg_quote( substr( $format, $p + 1, $endQuote - $p - 1 ), '/' );
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$p = $endQuote;
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}
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} else {
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// Quote at end of string, assume literal "
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$s .= '"';
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}
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break;
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default:
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$s .= preg_quote( $format[$p], '/' );
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}
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if ( $num !== false ) {
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$s .= '(' . $digitsRegexp . '{' . $num . '})';
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}
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}
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$tzRegexp = self::regexpAlternateGroup( array_keys( $tzAbbrs ) );
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// Hard-coded parentheses and space like in Parser::pstPass2
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// Ignore some invisible Unicode characters that often sneak into copy-pasted timestamps (T245784)
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// \uNNNN syntax can only be used from PHP 7.3
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return '/' . $s . '[\\x{200E}\\x{200F}]? [\\x{200E}\\x{200F}]?\\(' . $tzRegexp . '\\)/u';
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}
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/**
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* Get a function that parses timestamps generated using the given date format, based on the result
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* of matching the regexp returned by getTimestampRegexp()
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*
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* @param string $contLangVariant Content language variant
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* @param string $format Date format, as used by MediaWiki
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* @param string[]|null $digits Localised digits from 0 to 9, e.g. `[ '0', '1', ..., '9' ]`
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* @param string $localTimezone Local timezone IANA name, e.g. `America/New_York`
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* @param array $tzAbbrs Map of localised timezone abbreviations to IANA abbreviations
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* for the local timezone, e.g. [ 'EDT' => 'EDT', 'EST' => 'EST' ]
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* @return callable Parser function
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*/
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private function getTimestampParser(
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string $contLangVariant, string $format, ?array $digits, string $localTimezone, array $tzAbbrs
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): callable {
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$untransformDigits = static function ( string $text ) use ( $digits ) {
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if ( !$digits ) {
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return $text;
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}
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return preg_replace_callback(
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'/[' . implode( '', $digits ) . ']/u',
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static function ( array $m ) use ( $digits ) {
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return (string)array_search( $m[0], $digits );
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},
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$text
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);
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};
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$formatLength = strlen( $format );
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$matchingGroups = [];
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for ( $p = 0; $p < $formatLength; $p++ ) {
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$code = $format[$p];
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if ( $code === 'x' && $p < $formatLength - 1 ) {
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$code .= $format[++$p];
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}
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if ( $code === 'xk' && $p < $formatLength - 1 ) {
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$code .= $format[++$p];
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}
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switch ( $code ) {
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case 'xx':
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break;
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case 'xg':
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case 'd':
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case 'j':
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case 'D':
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case 'l':
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case 'F':
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case 'M':
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case 'n':
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case 'Y':
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case 'xkY':
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case 'G':
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case 'H':
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case 'i':
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$matchingGroups[] = $code;
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break;
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case '\\':
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// Backslash escaping
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if ( $p < $formatLength - 1 ) {
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$p++;
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}
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break;
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case '"':
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// Quoted literal
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if ( $p < $formatLength - 1 ) {
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$endQuote = strpos( $format, '"', $p + 1 );
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if ( $endQuote !== false ) {
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$p = $endQuote;
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}
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}
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break;
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default:
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break;
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}
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}
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return function ( array $match ) use (
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$matchingGroups, $untransformDigits, $localTimezone, $tzAbbrs, $contLangVariant
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) {
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if ( is_array( $match[0] ) ) {
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// Strip PREG_OFFSET_CAPTURE data
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unset( $match['offset'] );
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$match = array_map( static function ( array $tuple ) {
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return $tuple[0];
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}, $match );
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}
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$year = 0;
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$monthIdx = 0;
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$day = 0;
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$hour = 0;
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$minute = 0;
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foreach ( $matchingGroups as $i => $code ) {
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$text = $match[$i + 1];
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switch ( $code ) {
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case 'xg':
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$monthIdx = array_search(
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$text,
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$this->getMessages( $contLangVariant, Language::MONTH_GENITIVE_MESSAGES )
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);
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break;
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case 'd':
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case 'j':
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$day = intval( $untransformDigits( $text ) );
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break;
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case 'D':
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case 'l':
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// Day of the week - unused
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break;
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case 'F':
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$monthIdx = array_search(
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$text,
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$this->getMessages( $contLangVariant, Language::MONTH_MESSAGES )
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);
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break;
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case 'M':
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$monthIdx = array_search(
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$text,
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$this->getMessages( $contLangVariant, Language::MONTH_ABBREVIATED_MESSAGES )
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);
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break;
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case 'n':
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$monthIdx = intval( $untransformDigits( $text ) ) - 1;
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break;
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case 'Y':
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$year = intval( $untransformDigits( $text ) );
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break;
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case 'xkY':
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// Thai year
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$year = intval( $untransformDigits( $text ) ) - 543;
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break;
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case 'G':
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case 'H':
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$hour = intval( $untransformDigits( $text ) );
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break;
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case 'i':
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$minute = intval( $untransformDigits( $text ) );
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break;
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default:
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// TODO throw NotImplementedException or whatever it's called
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throw new MWException( 'Not implemented' );
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}
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}
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// The last matching group is the timezone abbreviation
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$tzAbbr = $tzAbbrs[ end( $match ) ];
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// Most of the time, the timezone abbreviation is not necessary to parse the date, since we
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// can assume all times are in the wiki's local timezone.
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$date = new DateTime();
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// setTimezone must be called before setDate/setTime
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$date->setTimezone( new DateTimeZone( $localTimezone ) );
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$date->setDate( $year, $monthIdx + 1, $day );
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$date->setTime( $hour, $minute, 0 );
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// But during the "fall back" at the end of DST, some times will happen twice.
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// Since the timezone abbreviation disambiguates the DST/non-DST times, we can detect
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// when PHP chose the wrong one, and then try the other one. It appears that PHP always
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// uses the later (non-DST) hour, but that behavior isn't documented, so we account for both.
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if ( $date->format( 'T' ) !== $tzAbbr ) {
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$altDate = clone $date;
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if ( $date->format( 'I' ) ) {
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// Parsed time is DST, try non-DST by advancing one hour
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$altDate->add( new DateInterval( 'PT1H' ) );
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} else {
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// Parsed time is non-DST, try DST by going back one hour
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$altDate->sub( new DateInterval( 'PT1H' ) );
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}
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if ( $altDate->format( 'T' ) === $tzAbbr ) {
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$date = $altDate;
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$discussionToolsWarning = 'Timestamp has timezone abbreviation for the wrong time';
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} else {
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$discussionToolsWarning = 'Ambiguous time at DST switchover was parsed';
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}
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}
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// Now set the timezone back to UTC for formatting
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$date->setTimezone( new DateTimeZone( 'UTC' ) );
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$date = DateTimeImmutable::createFromMutable( $date );
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if ( isset( $discussionToolsWarning ) ) {
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// @phan-suppress-next-line PhanUndeclaredProperty
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$date->discussionToolsWarning = $discussionToolsWarning;
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}
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return $date;
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};
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}
|
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|
|
/**
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* Get a regexp that matches timestamps in the local date format, for each language variant.
|
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*
|
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* This calls getTimestampRegexp() with predefined data for the current wiki.
|
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*
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* @return string[] Regular expressions
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*/
|
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public function getLocalTimestampRegexps(): array {
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$langConv = MediaWikiServices::getInstance()->getLanguageConverterFactory()
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->getLanguageConverter( $this->language );
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return array_map( function ( $contLangVariant ) {
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return $this->getTimestampRegexp(
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$contLangVariant,
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$this->dateFormat[$contLangVariant],
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'[' . implode( '', $this->digits[$contLangVariant] ) . ']',
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$this->timezones[$contLangVariant]
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);
|
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}, $langConv->getVariants() );
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}
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|
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/**
|
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* Get a function that parses timestamps in the local date format, for each language variant,
|
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* based on the result of matching the regexp returned by getLocalTimestampRegexp().
|
|
*
|
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* This calls getTimestampParser() with predefined data for the current wiki.
|
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*
|
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* @return callable[] Parser functions
|
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*/
|
|
private function getLocalTimestampParsers(): array {
|
|
$langConv = MediaWikiServices::getInstance()->getLanguageConverterFactory()
|
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->getLanguageConverter( $this->language );
|
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return array_map( function ( $contLangVariant ) {
|
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return $this->getTimestampParser(
|
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$contLangVariant,
|
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$this->dateFormat[$contLangVariant],
|
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$this->digits[$contLangVariant],
|
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$this->localTimezone,
|
|
$this->timezones[$contLangVariant]
|
|
);
|
|
}, $langConv->getVariants() );
|
|
}
|
|
|
|
/**
|
|
* Given a link node (`<a>`), if it's a link to a user-related page, return their username.
|
|
*
|
|
* @param Element $link
|
|
* @return string|null Username, or null
|
|
*/
|
|
private function getUsernameFromLink( Element $link ): ?string {
|
|
$username = null;
|
|
|
|
// Selflink: use title of current page
|
|
if ( strstr( $link->getAttribute( 'class' ) ?: '', 'mw-selflink' ) !== false ) {
|
|
$title = $this->title;
|
|
} else {
|
|
$title = CommentUtils::getTitleFromUrl( $link->getAttribute( 'href' ) ?? '' );
|
|
}
|
|
if ( !$title ) {
|
|
return null;
|
|
}
|
|
if ( $title->getNamespace() === NS_USER || $title->getNamespace() === NS_USER_TALK ) {
|
|
$username = $title->getText();
|
|
if ( strpos( $username, '/' ) !== false ) {
|
|
return null;
|
|
}
|
|
} elseif ( $title->isSpecial( 'Contributions' ) ) {
|
|
$parts = explode( '/', $title->getText(), 2 );
|
|
if ( !isset( $parts[1] ) ) {
|
|
return null;
|
|
}
|
|
// Normalize the username: users may link to their contributions with an unnormalized name
|
|
$userpage = Title::makeTitleSafe( NS_USER, $parts[1] );
|
|
if ( !$userpage ) {
|
|
return null;
|
|
}
|
|
$username = $userpage->getText();
|
|
}
|
|
if ( !$username ) {
|
|
return null;
|
|
}
|
|
if ( IPUtils::isIPv6( $username ) ) {
|
|
// Bot-generated links "Preceding unsigned comment added by" have non-standard case
|
|
$username = strtoupper( $username );
|
|
}
|
|
return $username;
|
|
}
|
|
|
|
/**
|
|
* Find a user signature preceding a timestamp.
|
|
*
|
|
* The signature includes the timestamp node.
|
|
*
|
|
* A signature must contain at least one link to the user's userpage, discussion page or
|
|
* contributions (and may contain other links). The link may be nested in other elements.
|
|
*
|
|
* This function returns a two-element array. The first element is an array of sibling nodes
|
|
* comprising the signature, in reverse order (with $timestampNode or its parent node as the last
|
|
* element). The second element is the username (null for unsigned comments).
|
|
*
|
|
* @param Text $timestampNode
|
|
* @param Node|null $until Node to stop searching at
|
|
* @return array [ nodes, username ]
|
|
*/
|
|
private function findSignature( Text $timestampNode, ?Node $until = null ): array {
|
|
$sigUsername = null;
|
|
$length = 0;
|
|
$lastLinkNode = $timestampNode;
|
|
|
|
CommentUtils::linearWalkBackwards(
|
|
$timestampNode,
|
|
function ( string $event, Node $node ) use (
|
|
&$sigUsername, &$lastLinkNode, &$length,
|
|
$until, $timestampNode
|
|
) {
|
|
if ( $event === 'enter' && $node === $until ) {
|
|
return true;
|
|
}
|
|
if ( $length >= self::SIGNATURE_SCAN_LIMIT ) {
|
|
return true;
|
|
}
|
|
if ( CommentUtils::isBlockElement( $node ) ) {
|
|
// Don't allow reaching into preceding paragraphs
|
|
return true;
|
|
}
|
|
|
|
if ( $event === 'leave' && $node !== $timestampNode ) {
|
|
$length += $node instanceof Text ? mb_strlen( $node->textContent ?? '' ) : 0;
|
|
}
|
|
|
|
// Find the closest link before timestamp that links to the user's user page.
|
|
//
|
|
// Support timestamps being linked to the diff introducing the comment:
|
|
// if the timestamp node is the only child of a link node, use the link node instead
|
|
//
|
|
// Handle links nested in formatting elements.
|
|
if ( $event === 'leave' && $node instanceof Element && strtolower( $node->nodeName ) === 'a' ) {
|
|
$username = $this->getUsernameFromLink( $node );
|
|
if ( $username ) {
|
|
// Accept the first link to the user namespace, then only accept links to that user
|
|
if ( $sigUsername === null ) {
|
|
$sigUsername = $username;
|
|
}
|
|
if ( $username === $sigUsername ) {
|
|
$lastLinkNode = $node;
|
|
}
|
|
}
|
|
// Keep looking if a node with links wasn't a link to a user page
|
|
// "Doc James (talk · contribs · email)"
|
|
}
|
|
}
|
|
);
|
|
|
|
$range = new ImmutableRange(
|
|
$lastLinkNode->parentNode,
|
|
CommentUtils::childIndexOf( $lastLinkNode ),
|
|
$timestampNode->parentNode,
|
|
CommentUtils::childIndexOf( $timestampNode ) + 1
|
|
);
|
|
|
|
// Expand the range so that it covers sibling nodes.
|
|
// This will include any wrapping formatting elements as part of the signature.
|
|
//
|
|
// Helpful accidental feature: users whose signature is not detected in full (due to
|
|
// text formatting) can just wrap it in a <span> to fix that.
|
|
// "Ten Pound Hammer • (What did I screw up now?)"
|
|
// "« Saper // dyskusja »"
|
|
//
|
|
// TODO Not sure if this is actually good, might be better to just use the range...
|
|
$sigNodes = array_reverse( CommentUtils::getCoveredSiblings( $range ) );
|
|
|
|
return [ $sigNodes, $sigUsername ];
|
|
}
|
|
|
|
/**
|
|
* Callback for TreeWalker that will skip over nodes where we don't want to detect
|
|
* comments (or section headings).
|
|
*
|
|
* @param Node $node
|
|
* @return int Appropriate NodeFilter constant
|
|
*/
|
|
public static function acceptOnlyNodesAllowingComments( Node $node ): int {
|
|
// The table of contents has a heading that gets erroneously detected as a section
|
|
if ( $node instanceof Element && $node->getAttribute( 'id' ) === 'toc' ) {
|
|
return NodeFilter::FILTER_REJECT;
|
|
}
|
|
// Don't detect comments within quotes (T275881)
|
|
if ( $node instanceof Element && (
|
|
strtolower( $node->tagName ) === 'blockquote' ||
|
|
strtolower( $node->tagName ) === 'cite' ||
|
|
strtolower( $node->tagName ) === 'q'
|
|
) ) {
|
|
return NodeFilter::FILTER_REJECT;
|
|
}
|
|
// Don't detect comments within headings (but don't reject the headings themselves)
|
|
if ( ( $par = $node->parentNode ) instanceof Element && preg_match( '/^h([1-6])$/i', $par->tagName ) ) {
|
|
return NodeFilter::FILTER_REJECT;
|
|
}
|
|
return NodeFilter::FILTER_ACCEPT;
|
|
}
|
|
|
|
/**
|
|
* Find a timestamps in a given text node
|
|
*
|
|
* @param Text $node
|
|
* @param string[] $timestampRegexps
|
|
* @return array|null Array with the following keys:
|
|
* - int 'offset' Length of extra text preceding the node that was used for matching (in bytes)
|
|
* - int 'parserIndex' Which of the regexps matched
|
|
* - array 'matchData' Regexp match data, which specifies the location of the match,
|
|
* and which can be parsed using getLocalTimestampParsers() (offsets are in bytes)
|
|
*/
|
|
public function findTimestamp( Text $node, array $timestampRegexps ): ?array {
|
|
$nodeText = '';
|
|
$offset = 0;
|
|
|
|
while ( $node ) {
|
|
$nodeText = $node->nodeValue . $nodeText;
|
|
|
|
// In Parsoid HTML, entities are represented as a 'mw:Entity' node, rather than normal HTML
|
|
// entities. On Arabic Wikipedia, the "UTC" timezone name contains some non-breaking spaces,
|
|
// which apparently are often turned into entities by buggy editing tools. To handle
|
|
// this, we must piece together the text, so that our regexp can match those timestamps.
|
|
if (
|
|
( $previousSibling = $node->previousSibling ) &&
|
|
$previousSibling instanceof Element &&
|
|
$previousSibling->getAttribute( 'typeof' ) === 'mw:Entity'
|
|
) {
|
|
$nodeText = $previousSibling->firstChild->nodeValue . $nodeText;
|
|
$offset += strlen( $previousSibling->firstChild->nodeValue ?? '' );
|
|
|
|
// If the entity is preceded by more text, do this again
|
|
if (
|
|
$previousSibling->previousSibling &&
|
|
$previousSibling->previousSibling instanceof Text
|
|
) {
|
|
$offset += strlen( $previousSibling->previousSibling->nodeValue ?? '' );
|
|
$node = $previousSibling->previousSibling;
|
|
} else {
|
|
$node = null;
|
|
}
|
|
} else {
|
|
$node = null;
|
|
}
|
|
}
|
|
|
|
foreach ( $timestampRegexps as $i => $timestampRegexp ) {
|
|
$matchData = null;
|
|
// Allows us to mimic match.index in #getComments
|
|
if ( preg_match( $timestampRegexp, $nodeText, $matchData, PREG_OFFSET_CAPTURE ) ) {
|
|
return [
|
|
'matchData' => $matchData,
|
|
'offset' => $offset,
|
|
'parserIndex' => $i,
|
|
];
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Get all discussion comments (and headings) within a DOM subtree.
|
|
*
|
|
* This returns a flat list, use getThreads() to get a tree structure starting at section headings.
|
|
*
|
|
* For example, for a MediaWiki discussion like this (we're dealing with HTML DOM here,
|
|
* the wikitext syntax is just for illustration):
|
|
*
|
|
* == A ==
|
|
* B. ~~~~
|
|
* : C.
|
|
* : C. ~~~~
|
|
* :: D. ~~~~
|
|
* ::: E. ~~~~
|
|
* ::: F. ~~~~
|
|
* : G. ~~~~
|
|
* H. ~~~~
|
|
* : I. ~~~~
|
|
*
|
|
* This function would return a structure like:
|
|
*
|
|
* [
|
|
* HeadingItem( { level: 0, range: (h2: A) } ),
|
|
* CommentItem( { level: 1, range: (p: B) } ),
|
|
* CommentItem( { level: 2, range: (li: C, li: C) } ),
|
|
* CommentItem( { level: 3, range: (li: D) } ),
|
|
* CommentItem( { level: 4, range: (li: E) } ),
|
|
* CommentItem( { level: 4, range: (li: F) } ),
|
|
* CommentItem( { level: 2, range: (li: G) } ),
|
|
* CommentItem( { level: 1, range: (p: H) } ),
|
|
* CommentItem( { level: 2, range: (li: I) } )
|
|
* ]
|
|
*
|
|
* @return ThreadItem[] Thread items
|
|
*/
|
|
public function getThreadItems(): array {
|
|
if ( !$this->threadItems ) {
|
|
$this->buildThreads();
|
|
}
|
|
return $this->threadItems;
|
|
}
|
|
|
|
/**
|
|
* Same as getFlatThreadItems, but only returns the CommentItems
|
|
*
|
|
* @return CommentItem[] Comment items
|
|
*/
|
|
public function getCommentItems(): array {
|
|
if ( !$this->commentItems ) {
|
|
$this->buildThreads();
|
|
}
|
|
return $this->commentItems;
|
|
}
|
|
|
|
/**
|
|
* Get all discussion comments (and headings) within a DOM subtree, grouped by item names.
|
|
*
|
|
* @return ThreadItem[][] Array where keys are thread item names, values are nonempty arrays of
|
|
* thread items
|
|
*/
|
|
public function getThreadItemsByName(): array {
|
|
if ( !$this->threadItems ) {
|
|
$this->buildThreads();
|
|
}
|
|
return $this->threadItemsByName;
|
|
}
|
|
|
|
/**
|
|
* Find ThreadItems by their name
|
|
*
|
|
* This will usually return a single-element array, but it may return multiple comments if they're
|
|
* indistinguishable by name. In that case, use their IDs to disambiguate.
|
|
*
|
|
* @param string $name Name
|
|
* @return ThreadItem[] Thread items, empty array if not found
|
|
*/
|
|
public function findCommentsByName( string $name ): array {
|
|
if ( !$this->threadItemsByName ) {
|
|
$this->buildThreads();
|
|
}
|
|
return $this->threadItemsByName[$name] ?? [];
|
|
}
|
|
|
|
/**
|
|
* Find a ThreadItem by its ID
|
|
*
|
|
* @param string $id ID
|
|
* @return ThreadItem|null Thread item, null if not found
|
|
*/
|
|
public function findCommentById( string $id ): ?ThreadItem {
|
|
if ( !$this->threadItemsById ) {
|
|
$this->buildThreads();
|
|
}
|
|
return $this->threadItemsById[$id] ?? null;
|
|
}
|
|
|
|
/**
|
|
* @param Node[] $sigNodes
|
|
* @param array $match
|
|
* @param Text $node
|
|
* @return ImmutableRange
|
|
*/
|
|
private function adjustSigRange( array $sigNodes, array $match, Text $node ): ImmutableRange {
|
|
$firstSigNode = end( $sigNodes );
|
|
$lastSigNode = $sigNodes[0];
|
|
|
|
// TODO Document why this needs to be so complicated
|
|
$lastSigNodeOffsetByteOffset =
|
|
$match['matchData'][0][1] + strlen( $match['matchData'][0][0] ) - $match['offset'];
|
|
$lastSigNodeOffset = $lastSigNode === $node ?
|
|
mb_strlen( substr( $node->nodeValue ?? '', 0, $lastSigNodeOffsetByteOffset ) ) :
|
|
CommentUtils::childIndexOf( $lastSigNode ) + 1;
|
|
$sigRange = new ImmutableRange(
|
|
$firstSigNode->parentNode,
|
|
CommentUtils::childIndexOf( $firstSigNode ),
|
|
$lastSigNode === $node ? $node : $lastSigNode->parentNode,
|
|
$lastSigNodeOffset
|
|
);
|
|
|
|
return $sigRange;
|
|
}
|
|
|
|
private function buildThreadItems(): void {
|
|
$timestampRegexps = $this->getLocalTimestampRegexps();
|
|
$commentItems = [];
|
|
$threadItems = [];
|
|
$dfParsers = $this->getLocalTimestampParsers();
|
|
|
|
// Placeholder heading in case there are comments in the 0th section
|
|
$range = new ImmutableRange( $this->rootNode, 0, $this->rootNode, 0 );
|
|
$fakeHeading = new HeadingItem( $range, 99, true );
|
|
$fakeHeading->setRootNode( $this->rootNode );
|
|
|
|
$curComment = $fakeHeading;
|
|
$curCommentEnd = $range->endContainer;
|
|
|
|
$treeWalker = new TreeWalker(
|
|
$this->rootNode,
|
|
NodeFilter::SHOW_ELEMENT | NodeFilter::SHOW_TEXT,
|
|
[ self::class, 'acceptOnlyNodesAllowingComments' ]
|
|
);
|
|
$lastSigNode = null;
|
|
while ( $node = $treeWalker->nextNode() ) {
|
|
if ( $node instanceof Element && preg_match( '/^h([1-6])$/i', $node->tagName, $match ) ) {
|
|
$headingNodeAndOffset = CommentUtils::getHeadlineNodeAndOffset( $node );
|
|
$headingNode = $headingNodeAndOffset['node'];
|
|
$startOffset = $headingNodeAndOffset['offset'];
|
|
$range = new ImmutableRange(
|
|
$headingNode, $startOffset, $headingNode, $headingNode->childNodes->length
|
|
);
|
|
$curComment = new HeadingItem( $range, (int)( $match[ 1 ] ) );
|
|
$curComment->setRootNode( $this->rootNode );
|
|
$threadItems[] = $curComment;
|
|
$curCommentEnd = $node;
|
|
} elseif ( $node instanceof Text && ( $match = $this->findTimestamp( $node, $timestampRegexps ) ) ) {
|
|
$warnings = [];
|
|
$foundSignature = $this->findSignature( $node, $lastSigNode );
|
|
$author = $foundSignature[1];
|
|
$lastSigNode = $foundSignature[0][0];
|
|
|
|
if ( !$author ) {
|
|
// Ignore timestamps for which we couldn't find a signature. It's probably not a real
|
|
// comment, but just a false match due to a copypasted timestamp.
|
|
continue;
|
|
}
|
|
|
|
$sigRanges = [];
|
|
$sigRanges[] = $this->adjustSigRange( $foundSignature[0], $match, $node );
|
|
|
|
// Everything from the last comment up to here is the next comment
|
|
$startNode = $this->nextInterestingLeafNode( $curCommentEnd );
|
|
$endNode = $lastSigNode;
|
|
|
|
// Skip to the end of the "paragraph". This only looks at tag names and can be fooled by CSS, but
|
|
// avoiding that would be more difficult and slower.
|
|
//
|
|
// If this skips over another potential signature, also skip it in the main TreeWalker loop, to
|
|
// avoid generating multiple comments when there is more than one signature on a single "line".
|
|
// Often this is done when someone edits their comment later and wants to add a note about that.
|
|
// (Or when another person corrects a typo, or strikes out a comment, etc.) Multiple comments
|
|
// within one paragraph/list-item result in a confusing double "Reply" button, and we also have
|
|
// no way to indicate which one you're replying to (this might matter in the future for
|
|
// notifications or something).
|
|
CommentUtils::linearWalk(
|
|
$lastSigNode,
|
|
function ( string $event, Node $n ) use (
|
|
&$endNode, &$sigRanges,
|
|
$treeWalker, $timestampRegexps, $node
|
|
) {
|
|
if ( CommentUtils::isBlockElement( $n ) ) {
|
|
// Stop when entering or leaving a block node
|
|
return true;
|
|
}
|
|
if (
|
|
$event === 'leave' &&
|
|
$n instanceof Text && $n !== $node &&
|
|
( $match2 = $this->findTimestamp( $n, $timestampRegexps ) )
|
|
) {
|
|
// If this skips over another potential signature, also skip it in the main TreeWalker loop
|
|
$treeWalker->currentNode = $n;
|
|
// …and add it as another signature to this comment (regardless of the author and timestamp)
|
|
$foundSignature2 = $this->findSignature( $n, $node );
|
|
if ( $foundSignature2[1] ) {
|
|
$sigRanges[] = $this->adjustSigRange( $foundSignature2[0], $match2, $n );
|
|
}
|
|
}
|
|
if ( $event === 'leave' ) {
|
|
// Take the last complete node which we skipped past
|
|
$endNode = $n;
|
|
}
|
|
}
|
|
);
|
|
|
|
$length = ( $endNode->nodeType === XML_TEXT_NODE ) ?
|
|
mb_strlen( rtrim( $endNode->nodeValue, "\t\n\f\r " ) ) :
|
|
// PHP bug: childNodes can be null for comment nodes
|
|
// (it should always be a NodeList, even if the node can't have children)
|
|
( $endNode->childNodes ? $endNode->childNodes->length : 0 );
|
|
$range = new ImmutableRange(
|
|
$startNode->parentNode,
|
|
CommentUtils::childIndexOf( $startNode ),
|
|
$endNode,
|
|
$length
|
|
);
|
|
|
|
$startLevel = CommentUtils::getIndentLevel( $startNode, $this->rootNode ) + 1;
|
|
$endLevel = CommentUtils::getIndentLevel( $node, $this->rootNode ) + 1;
|
|
if ( $startLevel !== $endLevel ) {
|
|
$warnings[] = 'Comment starts and ends with different indentation';
|
|
}
|
|
// Should this use the indent level of $startNode or $node?
|
|
$level = min( $startLevel, $endLevel );
|
|
|
|
$dateTime = $dfParsers[ $match['parserIndex'] ]( $match['matchData'] );
|
|
if ( isset( $dateTime->discussionToolsWarning ) ) {
|
|
$warnings[] = $dateTime->discussionToolsWarning;
|
|
}
|
|
|
|
$curComment = new CommentItem(
|
|
$level,
|
|
$range,
|
|
$sigRanges,
|
|
$dateTime,
|
|
$author
|
|
);
|
|
$curComment->setRootNode( $this->rootNode );
|
|
if ( $warnings ) {
|
|
$curComment->addWarnings( $warnings );
|
|
}
|
|
$commentItems[] = $curComment;
|
|
$threadItems[] = $curComment;
|
|
$curCommentEnd = $curComment->getRange()->endContainer;
|
|
}
|
|
}
|
|
|
|
// Insert the fake placeholder heading if there are any comments in the 0th section
|
|
// (before the first real heading)
|
|
if ( count( $threadItems ) && !( $threadItems[ 0 ] instanceof HeadingItem ) ) {
|
|
array_unshift( $threadItems, $fakeHeading );
|
|
}
|
|
|
|
$this->commentItems = $commentItems;
|
|
$this->threadItems = $threadItems;
|
|
}
|
|
|
|
/**
|
|
* Group discussion comments into threads and associate replies to original messages.
|
|
*
|
|
* Each thread must begin with a heading. Original messages in the thread are treated as replies to
|
|
* its heading. Other replies are associated based on the order and indentation level.
|
|
*
|
|
* Note that the objects in `comments` are extended in-place with the additional data.
|
|
*
|
|
* For example, for a MediaWiki discussion like this (we're dealing with HTML DOM here,
|
|
* the wikitext syntax is just for illustration):
|
|
*
|
|
* == A ==
|
|
* B. ~~~~
|
|
* : C.
|
|
* : C. ~~~~
|
|
* :: D. ~~~~
|
|
* ::: E. ~~~~
|
|
* ::: F. ~~~~
|
|
* : G. ~~~~
|
|
* H. ~~~~
|
|
* : I. ~~~~
|
|
*
|
|
* This function would return a structure like:
|
|
*
|
|
* [
|
|
* HeadingItem( { level: 0, range: (h2: A), replies: [
|
|
* CommentItem( { level: 1, range: (p: B), replies: [
|
|
* CommentItem( { level: 2, range: (li: C, li: C), replies: [
|
|
* CommentItem( { level: 3, range: (li: D), replies: [
|
|
* CommentItem( { level: 4, range: (li: E), replies: [] },
|
|
* CommentItem( { level: 4, range: (li: F), replies: [] },
|
|
* ] },
|
|
* ] },
|
|
* CommentItem( { level: 2, range: (li: G), replies: [] },
|
|
* ] },
|
|
* CommentItem( { level: 1, range: (p: H), replies: [
|
|
* CommentItem( { level: 2, range: (li: I), replies: [] },
|
|
* ] },
|
|
* ] } )
|
|
* ]
|
|
*
|
|
* @return HeadingItem[] Tree structure of comments, top-level items are the headings.
|
|
*/
|
|
public function getThreads(): array {
|
|
if ( !$this->threads ) {
|
|
$this->buildThreads();
|
|
}
|
|
return $this->threads;
|
|
}
|
|
|
|
/**
|
|
* Truncate user generated parts of IDs so full ID always fits within a database field of length 255
|
|
*
|
|
* @param string $text Text
|
|
* @return string Truncated text
|
|
*/
|
|
private function truncateForId( string $text ): string {
|
|
return $this->language->truncateForDatabase( $text, 80, '' );
|
|
}
|
|
|
|
/**
|
|
* Given a thread item, return an identifier for it that is unique within the page.
|
|
*
|
|
* @param ThreadItem $threadItem
|
|
* @return string
|
|
*/
|
|
private function computeId( ThreadItem $threadItem ): string {
|
|
// When changing the algorithm below, copy the old version into computeLegacyId()
|
|
// for compatibility with cached data.
|
|
|
|
$id = null;
|
|
|
|
if ( $threadItem instanceof HeadingItem && $threadItem->isPlaceholderHeading() ) {
|
|
// The range points to the root note, using it like below results in silly values
|
|
$id = 'h-';
|
|
} elseif ( $threadItem instanceof HeadingItem ) {
|
|
$headline = CommentUtils::getHeadlineNodeAndOffset( $threadItem->getRange()->startContainer )['node'];
|
|
$id = 'h-' . $this->truncateForId( $headline->getAttribute( 'id' ) ?? '' );
|
|
} elseif ( $threadItem instanceof CommentItem ) {
|
|
$id = 'c-' . $this->truncateForId( str_replace( ' ', '_', $threadItem->getAuthor() ) ) .
|
|
'-' . $threadItem->getTimestampString();
|
|
} else {
|
|
throw new MWException( 'Unknown ThreadItem type' );
|
|
}
|
|
|
|
// If there would be multiple comments with the same ID (i.e. the user left multiple comments
|
|
// in one edit, or within a minute), add the parent ID to disambiguate them.
|
|
$threadItemParent = $threadItem->getParent();
|
|
if ( $threadItemParent instanceof HeadingItem && !$threadItemParent->isPlaceholderHeading() ) {
|
|
$headline = CommentUtils::getHeadlineNodeAndOffset( $threadItemParent->getRange()->startContainer )['node'];
|
|
$id .= '-' . $this->truncateForId( $headline->getAttribute( 'id' ) ?? '' );
|
|
} elseif ( $threadItemParent instanceof CommentItem ) {
|
|
$id .= '-' . $this->truncateForId( str_replace( ' ', '_', $threadItemParent->getAuthor() ) ) .
|
|
'-' . $threadItemParent->getTimestampString();
|
|
}
|
|
|
|
if ( $threadItem instanceof HeadingItem ) {
|
|
// To avoid old threads re-appearing on popular pages when someone uses a vague title
|
|
// (e.g. dozens of threads titled "question" on [[Wikipedia:Help desk]]: https://w.wiki/fbN),
|
|
// include the oldest timestamp in the thread (i.e. date the thread was started) in the
|
|
// heading ID.
|
|
$oldestComment = $this->getThreadStartComment( $threadItem );
|
|
if ( $oldestComment ) {
|
|
$id .= '-' . $oldestComment->getTimestampString();
|
|
}
|
|
}
|
|
|
|
if ( isset( $this->threadItemsById[$id] ) ) {
|
|
// Well, that's tough
|
|
$threadItem->addWarning( 'Duplicate comment ID' );
|
|
// Finally, disambiguate by adding sequential numbers, to allow replying to both comments
|
|
$number = 1;
|
|
while ( isset( $this->threadItemsById["$id-$number"] ) ) {
|
|
$number++;
|
|
}
|
|
$id = "$id-$number";
|
|
}
|
|
|
|
return $id;
|
|
}
|
|
|
|
/**
|
|
* Given a thread item, return an identifier for it like computeId(), generated according to an
|
|
* older algorithm, so that we can still match IDs from cached data.
|
|
*
|
|
* @param ThreadItem $threadItem
|
|
* @return string|null
|
|
*/
|
|
private function computeLegacyId( ThreadItem $threadItem ): ?string {
|
|
// When we change the algorithm in computeId(), the old version should be copied below
|
|
// for compatibility with cached data.
|
|
|
|
// Currently not needed.
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Given a thread item, return an identifier for it that is consistent across all pages and
|
|
* revisions where this comment might appear.
|
|
*
|
|
* Multiple comments on a page can have the same name; use ID to distinguish them.
|
|
*
|
|
* @param ThreadItem $threadItem
|
|
* @return string
|
|
*/
|
|
private function computeName( ThreadItem $threadItem ): string {
|
|
$name = null;
|
|
|
|
if ( $threadItem instanceof HeadingItem ) {
|
|
$name = 'h-';
|
|
$mainComment = $this->getThreadStartComment( $threadItem );
|
|
} elseif ( $threadItem instanceof CommentItem ) {
|
|
$name = 'c-';
|
|
$mainComment = $threadItem;
|
|
} else {
|
|
throw new MWException( 'Unknown ThreadItem type' );
|
|
}
|
|
|
|
if ( $mainComment ) {
|
|
$name .= $this->truncateForId( str_replace( ' ', '_', $mainComment->getAuthor() ) ) .
|
|
'-' . $mainComment->getTimestampString();
|
|
}
|
|
|
|
return $name;
|
|
}
|
|
|
|
private function buildThreads(): void {
|
|
if ( !$this->threadItems ) {
|
|
$this->buildThreadItems();
|
|
}
|
|
|
|
$threads = [];
|
|
$replies = [];
|
|
$this->threadItemsById = [];
|
|
$this->threadItemsByName = [];
|
|
|
|
foreach ( $this->threadItems as $threadItem ) {
|
|
if ( count( $replies ) < $threadItem->getLevel() ) {
|
|
// Someone skipped an indentation level (or several). Pretend that the previous reply
|
|
// covers multiple indentation levels, so that following comments get connected to it.
|
|
$threadItem->addWarning( 'Comment skips indentation level' );
|
|
while ( count( $replies ) < $threadItem->getLevel() ) {
|
|
$replies[] = end( $replies );
|
|
}
|
|
}
|
|
|
|
if ( $threadItem instanceof HeadingItem ) {
|
|
// New root (thread)
|
|
$threads[] = $threadItem;
|
|
// Attach as a sub-thread to preceding higher-level heading.
|
|
// Any replies will appear in the tree twice, under the main-thread and the sub-thread.
|
|
$maybeParent = count( $threads ) > 1 ? $threads[ count( $threads ) - 2 ] : null;
|
|
while ( $maybeParent && $maybeParent->getHeadingLevel() >= $threadItem->getHeadingLevel() ) {
|
|
$maybeParent = $maybeParent->getParent();
|
|
}
|
|
if ( $maybeParent ) {
|
|
$threadItem->setParent( $maybeParent );
|
|
$maybeParent->addReply( $threadItem );
|
|
}
|
|
} elseif ( isset( $replies[ $threadItem->getLevel() - 1 ] ) ) {
|
|
// Add as a reply to the closest less-nested comment
|
|
$threadItem->setParent( $replies[ $threadItem->getLevel() - 1 ] );
|
|
$threadItem->getParent()->addReply( $threadItem );
|
|
} else {
|
|
$threadItem->addWarning( 'Comment could not be connected to a thread' );
|
|
}
|
|
|
|
$replies[ $threadItem->getLevel() ] = $threadItem;
|
|
// Cut off more deeply nested replies
|
|
array_splice( $replies, $threadItem->getLevel() + 1 );
|
|
}
|
|
|
|
$this->threads = $threads;
|
|
|
|
foreach ( $this->threadItems as $threadItem ) {
|
|
$name = $this->computeName( $threadItem );
|
|
$threadItem->setName( $name );
|
|
$this->threadItemsByName[$name][] = $threadItem;
|
|
|
|
// Set the IDs used to refer to comments and headings.
|
|
// This has to be a separate pass because we don't have the list of replies before
|
|
// this point.
|
|
$id = $this->computeId( $threadItem );
|
|
$threadItem->setId( $id );
|
|
$this->threadItemsById[$id] = $threadItem;
|
|
$legacyId = $this->computeLegacyId( $threadItem );
|
|
$threadItem->setLegacyId( $legacyId );
|
|
if ( $legacyId ) {
|
|
$this->threadItemsById[$legacyId] = $threadItem;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param ThreadItem $threadItem
|
|
* @return CommentItem|null
|
|
*/
|
|
private function getThreadStartComment( ThreadItem $threadItem ): ?CommentItem {
|
|
$oldest = null;
|
|
if ( $threadItem instanceof CommentItem ) {
|
|
$oldest = $threadItem;
|
|
}
|
|
// Check all replies. This can't just use the first comment because threads are often summarized
|
|
// at the top when the discussion is closed.
|
|
foreach ( $threadItem->getReplies() as $comment ) {
|
|
// Don't include sub-threads to avoid changing the ID when threads are "merged".
|
|
if ( $comment instanceof CommentItem ) {
|
|
$oldestInReplies = $this->getThreadStartComment( $comment );
|
|
if ( !$oldest || $oldestInReplies->getTimestamp() < $oldest->getTimestamp() ) {
|
|
$oldest = $oldestInReplies;
|
|
}
|
|
}
|
|
}
|
|
return $oldest;
|
|
}
|
|
}
|