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