MediaWiki:Common.js
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/* MediaWiki:Common.js — grantha.io
*
* Responsibilities:
* 1. Transliteration engine (Devanāgarī → IAST / Kannada / Tamil).
* 2. Tag all transliteratable text nodes once per page load.
* 3. Apply the script stored in localStorage('grantha_reader_script')
* so every page opens in the user's preferred script automatically.
* 4. Listen for the 'gr-script-change' CustomEvent dispatched by the
* ReaderToolbar dropdown and re-apply the new script immediately.
* 5. TOC active-item highlight via MutationObserver (unchanged).
*
* The script-switcher bar/buttons previously built here are removed —
* the ReaderToolbar extension now owns the dropdown UI.
*
* localStorage key shared with ReaderToolbar: 'grantha_reader_script'
*/
( function () {
var LS_SCRIPT_KEY = 'grantha_reader_script';
var currentScript = 'deva';
// ── IAST transliteration ────────────────────────────────────────
function devanagariToIAST( text ) {
var CONSONANTS = {
'क':'k','ख':'kh','ग':'g','घ':'gh','ङ':'ṅ',
'च':'c','छ':'ch','ज':'j','झ':'jh','ञ':'ñ',
'ट':'ṭ','ठ':'ṭh','ड':'ḍ','ढ':'ḍh','ण':'ṇ',
'त':'t','थ':'th','द':'d','ध':'dh','न':'n',
'प':'p','फ':'ph','ब':'b','भ':'bh','म':'m',
'य':'y','र':'r','ल':'l','ळ':'ḷ','व':'v',
'श':'ś','ष':'ṣ','स':'s','ह':'h'
};
var DIACRITICS = {
'ा':'ā','ि':'i','ी':'ī','ु':'u','ू':'ū',
'ृ':'ṛ','ॄ':'ṝ','े':'e','ै':'ai','ो':'o','ौ':'au'
};
var VOWELS = {
'अ':'a','आ':'ā','इ':'i','ई':'ī','उ':'u','ऊ':'ū',
'ऋ':'ṛ','ॠ':'ṝ','ए':'e','ऐ':'ai','ओ':'o','औ':'au','ऽ':"'"
};
var MISC = {
'ं':'ṃ','ः':'ḥ','ँ':'m̐','ॐ':'oṃ',
'०':'0','१':'1','२':'2','३':'3','४':'4',
'५':'5','६':'6','७':'7','८':'8','९':'9'
};
var HALANTA = '्';
var chars = Array.from( text );
var result = '';
var i = 0;
while ( i < chars.length ) {
var ch = chars[ i ];
var next = chars[ i + 1 ];
if ( CONSONANTS[ ch ] ) {
var base = CONSONANTS[ ch ];
if ( next === HALANTA ) { result += base; i += 2; }
else if ( DIACRITICS[ next ] ) { result += base + DIACRITICS[ next ]; i += 2; }
else if ( next === 'ं' || next === 'ः' ) { result += base + 'a' + MISC[ next ]; i += 2; }
else { result += base + 'a'; i++; }
} else if ( VOWELS[ ch ] ) { result += VOWELS[ ch ]; i++; }
else if ( DIACRITICS[ ch ] ) { result += DIACRITICS[ ch ]; i++; }
else if ( MISC[ ch ] ) { result += MISC[ ch ]; i++; }
else { result += ch; i++; }
}
return result;
}
// ── Character maps for Kannada / Tamil ─────────────────────────
var SCRIPT_MAP = {
kn: {
'अ':'ಅ','आ':'ಆ','इ':'ಇ','ई':'ಈ','उ':'ಉ','ऊ':'ಊ','ऋ':'ಋ',
'ए':'ಏ','ऐ':'ಐ','ओ':'ಓ','औ':'ಔ','ऽ':'ಽ',
'क':'ಕ','ख':'ಖ','ग':'ಗ','घ':'ಘ','ङ':'ಙ',
'च':'ಚ','छ':'ಛ','ज':'ಜ','झ':'ಝ','ञ':'ಞ',
'ट':'ಟ','ठ':'ಠ','ड':'ಡ','ढ':'ಢ','ण':'ಣ',
'त':'ತ','थ':'ಥ','द':'ದ','ध':'ಧ','न':'ನ',
'प':'ಪ','फ':'ಫ','ब':'ಬ','भ':'ಭ','म':'ಮ',
'य':'ಯ','र':'ರ','ल':'ಲ','व':'ವ',
'श':'ಶ','ष':'ಷ','स':'ಸ','ह':'ಹ',
'ा':'ಾ','ि':'ಿ','ी':'ೀ','ु':'ು','ू':'ೂ',
'ृ':'ೃ','े':'ೇ','ै':'ೈ','ो':'ೋ','ौ':'ೌ',
'ं':'ಂ','ः':'ಃ','्':'್',
'०':'೦','१':'೧','२':'೨','३':'೩','४':'೪',
'५':'೫','६':'೬','७':'೭','८':'೮','९':'೯'
},
ta: {
'अ':'அ','आ':'ஆ','इ':'இ','ई':'ஈ','उ':'உ','ऊ':'ஊ',
'ऋ':'ரு','ॠ':'ரூ',
'ए':'ஏ','ऐ':'ஐ','ओ':'ஓ','औ':'ஔ',
'क':'க','ख':'க','ग':'க','घ':'க','ङ':'ங',
'च':'ச','छ':'ச','ज':'ஜ','झ':'ஜ','ञ':'ஞ',
'ट':'ட','ठ':'ட','ड':'ட','ढ':'ட','ण':'ண',
'त':'த','थ':'த','द':'த','ध':'த','न':'ந',
'प':'ப','फ':'ப','ब':'ப','भ':'ப','म':'ம',
'य':'ய','र':'ர','ल':'ல','ळ':'ழ','व':'வ',
'श':'ஶ','ष':'ஷ','स':'ஸ','ह':'ஹ',
'ा':'ா','ि':'ி','ी':'ீ','ु':'ு','ू':'ூ',
'ृ':'ு','ॄ':'ூ',
'े':'ே','ै':'ை','ो':'ோ','ौ':'ௌ',
'ं':'ம்','ः':':','ँ':'ம்','्':'்','ॐ':'ௐ','ऽ':'ௗ',
'०':'0','१':'1','२':'2','३':'3','४':'4',
'५':'5','६':'6','७':'7','८':'8','९':'9'
}
};
var PRE = [
[ /ङ्क/g, 'ंक' ], [ /ङ्ख/g, 'ंख' ], [ /ङ्ग/g, 'ंग' ], [ /ङ्घ/g, 'ंघ' ],
[ /ञ्च/g, 'ंच' ], [ /ञ्ज/g, 'ंज' ], [ /ण्ट/g, 'ंट' ], [ /ण्ड/g, 'ंड' ],
[ /न्त/g, 'ंत' ], [ /न्द/g, 'ंद' ], [ /म्ब/g, 'ंब' ], [ /म्भ/g, 'ंभ' ]
];
function transliterateText( text, script ) {
if ( script === 'en' ) return devanagariToIAST( text );
var map = SCRIPT_MAP[ script ];
if ( !map ) return text;
var t = text;
PRE.forEach( function ( p ) { t = t.replace( p[ 0 ], p[ 1 ] ); } );
return Array.from( t ).map( function ( ch ) {
return map[ ch ] !== undefined ? map[ ch ] : ch;
} ).join( '' );
}
// ── Tag all transliteratable text nodes once per page ───────────
// Wraps each text node in a <span data-deva="original"> so that
// applyScript() can flip the content without touching innerHTML.
// Covers both .mw-parser-output AND the TOC sidebar so that script
// switching is truly global across content and navigation.
var translatableSpans = [];
function tagTextNodes() {
// Walk only .mw-parser-output — the main article content.
//
// We deliberately EXCLUDE .vector-toc (the sidebar TOC):
// Vector 2022 has its own MutationObserver on the TOC that rebuilds
// list items when text nodes change. If we transliterate TOC text nodes,
// Vector re-reads the changed text, tries to match it to a heading anchor,
// fails (because anchors use the original Devanagari), and renders
// "unknown title" for those entries. Keeping the TOC in Devanagari
// preserves correct anchor navigation regardless of script selection.
var content = document.querySelector( '.mw-parser-output' );
if ( !content ) return;
var walker = document.createTreeWalker( content, NodeFilter.SHOW_TEXT );
var nodes = [];
while ( walker.nextNode() ) nodes.push( walker.currentNode );
nodes.forEach( function ( node ) {
var p = node.parentNode;
if ( !p ) return;
if ( p.hasAttribute && p.hasAttribute( 'data-deva' ) ) return;
if ( p.closest ) {
if ( p.closest( '.gr-controls' ) ||
p.closest( '.mw-editsection' ) ) return;
}
var orig = node.textContent;
if ( !orig.trim() ) return;
var span = document.createElement( 'span' );
span.setAttribute( 'data-deva', orig );
span.textContent = orig;
p.replaceChild( span, node );
translatableSpans.push( span );
} );
}
// ── Apply a script to all tagged spans ─────────────────────────
function applyScript( script ) {
currentScript = script;
translatableSpans.forEach( function ( span ) {
if ( !span.parentNode ) return; // detached node
var orig = span.getAttribute( 'data-deva' );
if ( !orig ) return;
span.textContent = ( script === 'deva' )
? orig
: transliterateText( orig, script );
} );
}
// ── TOC active-item highlight + lazy TOC tagging ───────────────
// ── TOC active-item highlight + lazy TOC tagging ───────────────
// ── TOC active-item highlight ───────────────────────────────────
// Watches class changes on TOC list items and colours the active
// link orange. We do NOT transliterate TOC text nodes — doing so
// triggers Vector's own TOC observer which rebuilds items using the
// new text as anchor text, failing to match the original heading
// IDs and showing "unknown title".
function watchTocActive() {
var toc = document.querySelector( '.vector-toc' );
if ( !toc || toc._grObserved ) return;
toc._grObserved = true;
if ( !window.MutationObserver ) return;
function attachHighlight( li ) {
observer.observe( li, { attributes: true, attributeFilter: [ 'class' ] } );
}
var observer = new MutationObserver( function ( mutations ) {
mutations.forEach( function ( m ) {
// New list items added (lazy render) → attach highlight to them
if ( m.type === 'childList' ) {
m.addedNodes.forEach( function ( n ) {
if ( n.nodeType !== 1 ) return;
if ( n.classList.contains( 'vector-toc-list-item' ) ) {
attachHighlight( n );
}
n.querySelectorAll && n.querySelectorAll( '.vector-toc-list-item' )
.forEach( attachHighlight );
} );
return;
}
// Class change → scroll active item into view if needed.
// Colour is handled entirely by CSS — no inline style manipulation
// which could conflict with Vector's own stylesheet.
if ( m.attributeName !== 'class' ) return;
var li = m.target;
if ( !li.classList.contains( 'vector-toc-list-item-active' ) ) return;
var container = document.querySelector( '.vector-sticky-pinned-container' );
if ( !container ) return;
var liRect = li.getBoundingClientRect();
var cRect = container.getBoundingClientRect();
var isAbove = liRect.top < cRect.top + 8;
var isBelow = liRect.bottom > cRect.bottom - 8;
if ( isAbove || isBelow ) {
li.scrollIntoView({ block: 'nearest', behavior: 'smooth' });
}
} );
} );
// Observe existing list items for class changes
toc.querySelectorAll( '.vector-toc-list-item' ).forEach( attachHighlight );
// Watch for new items (lazy TOC population)
observer.observe( toc, { childList: true, subtree: true } );
// On initial load: scroll to already-active item (colour handled by CSS)
setTimeout( function () {
var active = toc.querySelector( '.vector-toc-list-item-active' );
if ( active ) active.scrollIntoView({ block: 'nearest', behavior: 'auto' });
}, 400 );
}
// ── Init ──────────────────────────────────────────────────────
function init() {
var content = document.querySelector( '.mw-parser-output' );
var alreadyTagged = content && content.querySelector( '[data-deva]' );
if ( !alreadyTagged ) {
translatableSpans = [];
tagTextNodes();
}
// Apply the globally persisted script preference immediately
var saved = ( function () {
try { return localStorage.getItem( LS_SCRIPT_KEY ); } catch ( e ) { return null; }
}() );
if ( saved && saved !== 'deva' ) {
applyScript( saved );
} else {
currentScript = 'deva';
}
// watchTocActive handles both highlight colouring AND lazy TOC tagging
watchTocActive();
}
// ── React to toolbar dropdown changes on the same page ─────────
// The ReaderToolbar dispatches 'gr-script-change' when the user
// picks a new script. We just call applyScript() — no need to
// touch localStorage again (the toolbar already wrote it).
window.addEventListener( 'gr-script-change', function ( e ) {
var script = e && e.detail && e.detail.script;
if ( script ) applyScript( script );
} );
// ── MediaWiki hook (SPA-style navigation support) ───────────────
if ( window.mw ) {
mw.hook( 'wikipage.content' ).add( function () {
setTimeout( function () {
var content = document.querySelector( '.mw-parser-output' );
var alreadyTagged = content && content.querySelector( '[data-deva]' );
if ( !alreadyTagged ) {
translatableSpans = [];
tagTextNodes();
}
// Re-apply current script to newly loaded content
if ( currentScript !== 'deva' ) {
applyScript( currentScript );
}
watchTocActive();
}, 150 );
} );
}
// ── Fallback for non-MW environments ───────────────────────────
if ( document.readyState === 'loading' ) {
document.addEventListener( 'DOMContentLoaded', init );
} else {
init();
}
}() );