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'use strict';
/**
* Dynamic highlighting while reading an article
*
* @author Thiemo Kreuz
*/
( function () {
/**
* Checks if the ID uses a composite format that does not only consist of a sequential number.
*
* @param {string} id
* @return {boolean}
*/
function isNamedReference( id ) {
// Note: This assumes IDs start with the prefix; this is guaranteed by the parser function
return /^cite_ref-\D/.test( id );
}
/**
* @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 ) {
// We assume the first node we find here is the "↑ " text node
let textNode = $backlinkWrapper[ 0 ].firstChild;
const accessibilityLabel = mw.msg( 'cite_references_link_accessibility_back_label' );
const $upArrowLink = $( '<a>' )
.addClass( 'mw-cite-up-arrow-backlink' )
.attr( 'aria-label', accessibilityLabel )
.attr( 'title', accessibilityLabel );
if ( !textNode ) {
return $upArrowLink;
}
// Skip custom HTML wrappers, but abort when it's our own a11y label (see T384204)
while ( textNode.firstChild && textNode.className !== 'cite-accessibility-label' ) {
textNode = textNode.firstChild;
}
if ( textNode.nodeType !== Node.TEXT_NODE || textNode.data.trim() === '' ) {
return $upArrowLink;
}
const 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.
const $backlinkWrapper = $backlink.closest( '.mw-cite-backlink, li' );
let $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( ( $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 () {
const 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.
const $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 );
}
} );
} );
}() );