mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Cite
synced 2024-11-24 15:04:02 +00:00
115 lines
3.3 KiB
JavaScript
115 lines
3.3 KiB
JavaScript
'use strict';
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/**
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* Dynamic highlighting while reading an article
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*
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* @author Thiemo Kreuz
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*/
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( function () {
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/**
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* Checks if the ID uses a composite format that does not only consist of a sequential number.
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*
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* @param {string} id
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* @return {boolean}
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*/
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function isNamedReference( id ) {
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// Note: This assumes IDs start with the prefix; this is guaranteed by the parser function
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return /^cite_ref-\D/.test( id );
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}
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/**
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* @param {string} id
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* @param {jQuery} $content
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* @return {boolean}
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*/
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function isReusedNamedReference( id, $content ) {
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if ( !isNamedReference( id ) ) {
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return false;
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}
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// Either the ID is already a reuse, or at least one reuse exists somewhere else on the page
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return id.slice( -2 ) !== '-0' ||
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$content.find( '.references a[href="#' + $.escapeSelector( id.slice( 0, -1 ) ) + '1"]' ).length;
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}
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/**
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* @param {jQuery} $backlinkWrapper
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* @return {jQuery}
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*/
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function makeUpArrowLink( $backlinkWrapper ) {
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let textNode = $backlinkWrapper[ 0 ].firstChild;
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const accessibilityLabel = mw.msg( 'cite_references_link_accessibility_back_label' );
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const $upArrowLink = $( '<a>' )
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.addClass( 'mw-cite-up-arrow-backlink' )
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.attr( 'aria-label', accessibilityLabel )
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.attr( 'title', accessibilityLabel );
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if ( !textNode ) {
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return $upArrowLink;
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}
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// Skip additional, custom HTML wrappers, if any.
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while ( textNode.firstChild ) {
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textNode = textNode.firstChild;
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}
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if ( textNode.nodeType !== Node.TEXT_NODE || textNode.data.trim() === '' ) {
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return $upArrowLink;
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}
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const upArrow = textNode.data.trim();
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// The text node typically contains "↑ ", and we need to keep the space.
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textNode.data = textNode.data.replace( upArrow, '' );
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// Create a plain text and a clickable "↑". CSS :target selectors make sure only
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// one is visible at a time.
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$backlinkWrapper.prepend(
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$( '<span>' )
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.addClass( 'mw-cite-up-arrow' )
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.text( upArrow ),
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$upArrowLink
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.text( upArrow )
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);
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return $upArrowLink;
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}
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/**
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* @param {jQuery} $backlink
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*/
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function updateUpArrowLink( $backlink ) {
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// It's convenient to stop at the class name, but it's not guaranteed to be there.
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const $backlinkWrapper = $backlink.closest( '.mw-cite-backlink, li' );
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let $upArrowLink = $backlinkWrapper.find( '.mw-cite-up-arrow-backlink' );
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if ( !$upArrowLink.length && $backlinkWrapper.length ) {
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$upArrowLink = makeUpArrowLink( $backlinkWrapper );
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}
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$upArrowLink.attr( 'href', $backlink.attr( 'href' ) );
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}
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mw.hook( 'wikipage.content' ).add( ( $content ) => {
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// We are going to use the ID in the code below, so better be sure one is there.
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$content.find( '.reference[id] > a' ).on( 'click', function () {
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const id = $( this ).parent().attr( 'id' );
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$content.find( '.mw-cite-targeted-backlink' ).removeClass( 'mw-cite-targeted-backlink' );
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// Bail out if there is not at least a second backlink ("cite_references_link_many").
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if ( !isReusedNamedReference( id, $content ) ) {
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return;
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}
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// The :not() skips the duplicate link created below. Relevant when double clicking.
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const $backlink = $content.find( '.references a[href="#' + $.escapeSelector( id ) + '"]:not(.mw-cite-up-arrow-backlink)' )
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.first()
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.addClass( 'mw-cite-targeted-backlink' );
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if ( $backlink.length ) {
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updateUpArrowLink( $backlink );
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}
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} );
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} );
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}() );
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