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    56. 

  56.     e.preventDefault();
    57. 

  57.     this.selectResult();
    58. 

  58.   }
    59. 

  59. }
    60. 

  60. 

  61. Search.prototype.searchBoxKeyup = function (e) {
    62. 

  62.   if (e.keyCode === 13 || e.keyCode === 9) {
    63. 

  63.     return;
    64. 

  64.   }
    65. 

  65.   
    66. 

  66.   this.search(e.target.value);
    67. 

  67. }
    68. 

  68. 

  69. 

  70. Search.prototype.triggerSearch = function (e) {
    71. 

  71.   if (this.menu.isVisible()) {
    72. 

  72.     this._closeAfterSearch = false;
    73. 

  73.   } else {
    74. 

  74.     this._closeAfterSearch = true;
    75. 

  75.     this.menu.show();
    76. 

  76.   }
    77. 

  77. 

  78.   this.$searchBox.focus();
    79. 

  79.   this.$searchBox.select();
    80. 

  80. }
    81. 

  81. // bit 12 - Set if the result starts with searchString
    82. 

  82. // bits 8-11: 8 - number of chunks multiplied by 2 if cases match, otherwise 1.
    83. 

  83. // bits 1-7: 127 - length of the entry
    84. 

  84. // General scheme: prefer case sensitive matches with fewer chunks, and otherwise
    85. 

  85. // prefer shorter matches.
    86. 

  86. function relevance(result, searchString) {
    87. 

  87.   var relevance = 0;
    88. 

  88.   
    89. 

  89.   relevance = Math.max(0, 8 - result.match.chunks) << 7;
    90. 

  90.   
    91. 

  91.   if (result.match.caseMatch) {
    92. 

  92.     relevance *= 2;
    93. 

  93.   }
    94. 

  94.   
    95. 

  95.   if (result.match.prefix) {
    96. 

  96.     relevance += 2048
    97. 

  97.   }
    98. 

  98.   
    99. 

  99.   relevance += Math.max(0, 255 - result.entry.key.length);
    100. 

  100.   
    101. 

  101.   return relevance;
    102. 

  102. }
    103. 

  103. 

  104. Search.prototype.search = function (searchString) {
    105. 

  105.   var s = Date.now();
    106. 

  106. 

  107.   if (searchString === '') {
    108. 

  108.     this.displayResults([]);
    109. 

  109.     this.hideSearch();
    110. 

  110.     return;
    111. 

  111.   } else {
    112. 

  112.     this.showSearch();
    113. 

  113.   }
    114. 

  114.   
    115. 

  115.   if (searchString.length === 1) {
    116. 

  116.     this.displayResults([]);
    117. 

  117.     return;
    118. 

  118.   }
    119. 

  119.     
    120. 

  120.   var results;
    121. 

  121. 

  122.   if (/^[\d\.]*$/.test(searchString)) {
    123. 

  123.     results = this.biblio.clauses.filter(function (clause) {
    124. 

  124.       return clause.number.substring(0, searchString.length) === searchString;
    125. 

  125.     }).map(function (clause) {
    126. 

  126.       return { entry: clause };
    127. 

  127.     });
    128. 

  128.   } else {
    129. 

  129.     results = [];
    130. 

  130.     
    131. 

  131.     for (var i = 0; i < this.biblio.length; i++) {
    132. 

  132.       var entry = this.biblio[i];
    133. 

  133.       if (!entry.key) {
    134. 

  134.         // biblio entries without a key aren't searchable
    135. 

  135.         continue;
    136. 

  136.       }
    137. 

  137. 

  138.       var match = fuzzysearch(searchString, entry.key);
    139. 

  139.       if (match) {
    140. 

  140.         results.push({ entry: entry, match: match });
    141. 

  141.       }
    142. 

  142.     }
    143. 

  143.   
    144. 

  144.     results.forEach(function (result) {
    145. 

  145.       result.relevance = relevance(result, searchString);
    146. 

  146.     });
    147. 

  147.     
    148. 

  148.     results = results.sort(function (a, b) { return b.relevance - a.relevance });
    149. 

  149. 

  150.   }
    151. 

  151. 

  152.   if (results.length > 50) {
    153. 

  153.     results = results.slice(0, 50);
    154. 

  154.   }
    155. 

  155.   
    156. 

  156.   this.displayResults(results);
    157. 

  157. }
    158. 

  158. Search.prototype.hideSearch = function () {
    159. 

  159.   this.$search.classList.remove('active');
    160. 

  160. }
    161. 

  161. 

  162. Search.prototype.showSearch = function () {
    163. 

  163.   this.$search.classList.add('active');
    164. 

  164. }
    165. 

  165. 

  166. Search.prototype.selectResult = function () {
    167. 

  167.   var $first = this.$searchResults.querySelector('li:first-child a');
    168. 

  168. 

  169.   if ($first) {
    170. 

  170.     document.location = $first.getAttribute('href');
    171. 

  171.   }
    172. 

  172.   
    173. 

  173.   this.$searchBox.value = '';
    174. 

  174.   this.$searchBox.blur();
    175. 

  175.   this.displayResults([]);
    176. 

  176.   this.hideSearch();
    177. 

  177. 

  178.   if (this._closeAfterSearch) {
    179. 

  179.     this.menu.hide();
    180. 

  180.   }
    181. 

  181. }
    182. 

  182. 

  183. Search.prototype.displayResults = function (results) {
    184. 

  184.   if (results.length > 0) {
    185. 

  185.     this.$searchResults.classList.remove('no-results');
    186. 

  186.     
    187. 

  187.     var html = '<ul>';
    188. 

  188. 

  189.     results.forEach(function (result) {
    190. 

  190.       var entry = result.entry;
    191. 

  191.       var id = entry.id;
    192. 

  192.       var cssClass = '';
    193. 

  193.       var text = '';
    194. 

  194. 

  195.       if (entry.type === 'clause') {
    196. 

  196.         var number = entry.number ? entry.number + ' ' : '';
    197. 

  197.         text = number + entry.key;
    198. 

  198.         cssClass = 'clause';
    199. 

  199.         id = entry.id;
    200. 

  200.       } else if (entry.type === 'production') {
    201. 

  201.         text = entry.key;
    202. 

  202.         cssClass = 'prod';
    203. 

  203.         id = entry.id;  
    204. 

  204.       } else if (entry.type === 'op') {
    205. 

  205.         text = entry.key;
    206. 

  206.         cssClass = 'op';
    207. 

  207.         id = entry.id || entry.refId;
    208. 

  208.       } else if (entry.type === 'term') {
    209. 

  209.         text = entry.key;
    210. 

  210.         cssClass = 'term';
    211. 

  211.         id = entry.id || entry.refId;
    212. 

  212.       }
    213. 

  213. 

  214.       if (text) {
    215. 

  215.         html += '<li class=menu-search-result-' + cssClass + '><a href="#' + id + '">' + text + '</a></li>'
    216. 

  216.       }
    217. 

  217.     });
    218. 

  218. 

  219.     html += '</ul>'
    220. 

  220. 

  221.     this.$searchResults.innerHTML = html;
    222. 

  222.   } else {
    223. 

  223.     this.$searchResults.innerHTML = '';
    224. 

  224.     this.$searchResults.classList.add('no-results');
    225. 

  225.   }
    226. 

  226. }
    227. 

  227. 

  228. 

  229. function Menu() {
    230. 

  230.   this.$toggle = document.getElementById('menu-toggle');
    231. 

  231.   this.$menu = document.getElementById('menu');
    232. 

  232.   this.$toc = document.querySelector('menu-toc > ol');
    233. 

  233.   this.$pins = document.querySelector('#menu-pins');
    234. 

  234.   this.$pinList = document.getElementById('menu-pins-list');
    235. 

  235.   this.$toc = document.querySelector('#menu-toc > ol');
    236. 

  236.   this.$specContainer = document.getElementById('spec-container');
    237. 

  237.   this.search = new Search(this);
    238. 

  238.   
    239. 

  239.   this._pinnedIds = {}; 
    240. 

  240.   this.loadPinEntries();
    241. 

  241. 

  242.   // toggle menu
    243. 

  243.   this.$toggle.addEventListener('click', this.toggle.bind(this));
    244. 

  244. 

  245.   // keydown events for pinned clauses
    246. 

  246.   document.addEventListener('keydown', this.documentKeydown.bind(this));
    247. 

  247. 

  248.   // toc expansion
    249. 

  249.   var tocItems = this.$menu.querySelectorAll('#menu-toc li');
    250. 

  250.   for (var i = 0; i < tocItems.length; i++) {
    251. 

  251.     var $item = tocItems[i];
    252. 

  252.     $item.addEventListener('click', function($item, event) {
    253. 

  253.       $item.classList.toggle('active');
    254. 

  254.       event.stopPropagation();
    255. 

  255.     }.bind(null, $item));
    256. 

  256.   }
    257. 

  257. 

  258.   // close toc on toc item selection
    259. 

  259.   var tocLinks = this.$menu.querySelectorAll('#menu-toc li > a');
    260. 

  260.   for (var i = 0; i < tocLinks.length; i++) {
    261. 

  261.     var $link = tocLinks[i];
    262. 

  262.     $link.addEventListener('click', function(event) {
    263. 

  263.       this.toggle();
    264. 

  264.       event.stopPropagation();
    265. 

  265.     }.bind(this));
    266. 

  266.   }
    267. 

  267. 

  268.   // update active clause on scroll
    269. 

  269.   window.addEventListener('scroll', debounce(this.updateActiveClause.bind(this)));
    270. 

  270.   this.updateActiveClause();
    271. 

  271. 

  272.   // prevent menu scrolling from scrolling the body
    273. 

  273.   this.$toc.addEventListener('wheel', function (e) {
    274. 

  274.     var target = e.currentTarget;
    275. 

  275.     var offTop = e.deltaY < 0 && target.scrollTop === 0;
    276. 

  276.     if (offTop) {
    277. 

  277.       e.preventDefault();
    278. 

  278.     }
    279. 

  279.     var offBottom = e.deltaY > 0
    280. 

  280.                     && target.offsetHeight + target.scrollTop >= target.scrollHeight;
    281. 

  281. 

  282.     if (offBottom) {
    283. 

  283. 		  e.preventDefault();
    284. 

  284. 	  }
    285. 

  285.   })
    286. 

  286. }
    287. 

  287. 

  288. Menu.prototype.documentKeydown = function (e) {
    289. 

  289.   e.stopPropagation();
    290. 

  290.   if (e.keyCode === 80) {
    291. 

  291.     this.togglePinEntry();
    292. 

  292.   } else if (e.keyCode > 48 && e.keyCode < 58) {
    293. 

  293.     this.selectPin(e.keyCode - 49);
    294. 

  294.   }
    295. 

  295. }
    296. 

  296. 

  297. Menu.prototype.updateActiveClause = function () {
    298. 

  298.   this.setActiveClause(findActiveClause(this.$specContainer))
    299. 

  299. }
    300. 

  300. 

  301. Menu.prototype.setActiveClause = function (clause) {
    302. 

  302.   this.$activeClause = clause;
    303. 

  303.   this.revealInToc(this.$activeClause);
    304. 

  304. }
    305. 

  305. 

  306. Menu.prototype.revealInToc = function (path) {
    307. 

  307.   var current = this.$toc.querySelectorAll('li.revealed');
    308. 

  308.   for (var i = 0; i < current.length; i++) {
    309. 

  309.     current[i].classList.remove('revealed');
    310. 

  310.     current[i].classList.remove('revealed-leaf');
    311. 

  311.   }
    312. 

  312.   
    313. 

  313.   var current = this.$toc;
    314. 

  314.   var index = 0;
    315. 

  315.   while (index < path.length) {
    316. 

  316.     var children = current.children;
    317. 

  317.     for (var i = 0; i < children.length; i++) {
    318. 

  318.       if ('#' + path[index].id === children[i].children[1].getAttribute('href') ) {
    319. 

  319.         children[i].classList.add('revealed');
    320. 

  320.         if (index === path.length - 1) {
    321. 

  321.           children[i].classList.add('revealed-leaf');
    322. 

  322.           var rect = children[i].getBoundingClientRect();
    323. 

  323.           this.$toc.getBoundingClientRect().top
    324. 

  324.           var tocRect = this.$toc.getBoundingClientRect();
    325. 

  325.           if (rect.top + 10 > tocRect.bottom) {
    326. 

  326.             this.$toc.scrollTop = this.$toc.scrollTop + (rect.top - tocRect.bottom) + (rect.bottom - rect.top);
    327. 

  327.           } else if (rect.top < tocRect.top) {
    328. 

  328.             this.$toc.scrollTop = this.$toc.scrollTop - (tocRect.top - rect.top);
    329. 

  329.           }
    330. 

  330.         }
    331. 

  331.         current = children[i].querySelector('ol');
    332. 

  332.         index++;
    333. 

  333.         break;
    334. 

  334.       }      
    335. 

  335.     }
    336. 

  336.     
    337. 

  337.   }
    338. 

  338. }
    339. 

  339. 

  340. function findActiveClause(root, path) {
    341. 

  341.   var clauses = new ClauseWalker(root);
    342. 

  342.   var $clause;
    343. 

  343.   var found = false;
    344. 

  344.   var path = path || [];
    345. 

  345.   
    346. 

  346.   while ($clause = clauses.nextNode()) {
    347. 

  347.     var rect = $clause.getBoundingClientRect();
    348. 

  348.     var $header = $clause.children[0];
    349. 

  349.     var marginTop = parseInt(getComputedStyle($header)["margin-top"]);
    350. 

  350.     
    351. 

  351.     if ((rect.top - marginTop) <= 0 && rect.bottom > 0) {
    352. 

  352.       found = true;
    353. 

  353.       return findActiveClause($clause, path.concat($clause)) || path;
    354. 

  354.     }
    355. 

  355.   }
    356. 

  356.   
    357. 

  357.   return path;
    358. 

  358. }
    359. 

  359. 

  360. function ClauseWalker(root) {
    361. 

  361.   var previous;
    362. 

  362.   var treeWalker = document.createTreeWalker(
    363. 

  363.     root,
    364. 

  364.     NodeFilter.SHOW_ELEMENT,
    365. 

  365.     {
    366. 

  366.       acceptNode: function (node) {
    367. 

  367.         if (previous === node.parentNode) {
    368. 

  368.           return NodeFilter.FILTER_REJECT;
    369. 

  369.         } else {
    370. 

  370.           previous = node;
    371. 

  371.         }
    372. 

  372.         if (node.nodeName === 'EMU-CLAUSE' || node.nodeName === 'EMU-INTRO' || node.nodeName === 'EMU-ANNEX') {
    373. 

  373.           return NodeFilter.FILTER_ACCEPT;
    374. 

  374.         } else {
    375. 

  375.           return NodeFilter.FILTER_SKIP;
    376. 

  376.         }
    377. 

  377.       }
    378. 

  378.     },
    379. 

  379.     false
    380. 

  380.     );
    381. 

  381.   
    382. 

  382.   return treeWalker;
    383. 

  383. }
    384. 

  384. 

  385. Menu.prototype.toggle = function () {
    386. 

  386.   this.$menu.classList.toggle('active');
    387. 

  387. }
    388. 

  388. 

  389. Menu.prototype.show = function () {
    390. 

  390.   this.$menu.classList.add('active');
    391. 

  391. }
    392. 

  392. 

  393. Menu.prototype.hide = function () {
    394. 

  394.   this.$menu.classList.remove('active');
    395. 

  395. }
    396. 

  396. 

  397. Menu.prototype.isVisible = function() {
    398. 

  398.   return this.$menu.classList.contains('active');
    399. 

  399. }
    400. 

  400. 

  401. Menu.prototype.showPins = function () {
    402. 

  402.   this.$pins.classList.add('active');
    403. 

  403. }
    404. 

  404. 

  405. Menu.prototype.hidePins = function () {
    406. 

  406.   this.$pins.classList.remove('active');
    407. 

  407. }
    408. 

  408. 

  409. Menu.prototype.addPinEntry = function (id) {
    410. 

  410.   var entry = this.search.biblio.byId[id];
    411. 

  411.   if (!entry) {
    412. 

  412.     // id was deleted after pin (or something) so remove it
    413. 

  413.     delete this._pinnedIds[id];
    414. 

  414.     this.persistPinEntries();
    415. 

  415.     return;
    416. 

  416.   }
    417. 

  417. 

  418.   if (entry.type === 'clause') {
    419. 

  419.     var prefix;
    420. 

  420.     if (entry.number) {
    421. 

  421.       prefix = entry.number + ' ';
    422. 

  422.     } else {
    423. 

  423.       prefix = '';
    424. 

  424.     }
    425. 

  425.     this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + prefix + entry.titleHTML + '</a></li>';
    426. 

  426.   } else {
    427. 

  427.     this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + entry.key + '</a></li>';
    428. 

  428.   }
    429. 

  429. 

  430.   if (Object.keys(this._pinnedIds).length === 0) {
    431. 

  431.     this.showPins();
    432. 

  432.   }
    433. 

  433.   this._pinnedIds[id] = true;
    434. 

  434.   this.persistPinEntries();
    435. 

  435. }
    436. 

  436. 

  437. Menu.prototype.removePinEntry = function (id) {
    438. 

  438.   var item = this.$pinList.querySelector('a[href="#' + id + '"]').parentNode;
    439. 

  439.   this.$pinList.removeChild(item);
    440. 

  440.   delete this._pinnedIds[id];
    441. 

  441.   if (Object.keys(this._pinnedIds).length === 0) {
    442. 

  442.     this.hidePins();
    443. 

  443.   }
    444. 

  444. 

  445.   this.persistPinEntries();
    446. 

  446. }
    447. 

  447. 

  448. Menu.prototype.persistPinEntries = function () {
    449. 

  449.   try {
    450. 

  450.     if (!window.localStorage) return;
    451. 

  451.   } catch (e) {
    452. 

  452.     return;
    453. 

  453.   }
    454. 

  454. 

  455.   localStorage.pinEntries = JSON.stringify(Object.keys(this._pinnedIds));
    456. 

  456. }
    457. 

  457. 

  458. Menu.prototype.loadPinEntries = function () {
    459. 

  459.   try {
    460. 

  460.     if (!window.localStorage) return;
    461. 

  461.   } catch (e) {
    462. 

  462.     return;
    463. 

  463.   }
    464. 

  464.   
    465. 

  465.   var pinsString = window.localStorage.pinEntries;
    466. 

  466.   if (!pinsString) return;
    467. 

  467.   var pins = JSON.parse(pinsString);
    468. 

  468.   for(var i = 0; i < pins.length; i++) {
    469. 

  469.     this.addPinEntry(pins[i]);
    470. 

  470.   }
    471. 

  471. }
    472. 

  472. 

  473. Menu.prototype.togglePinEntry = function (id) {
    474. 

  474.   if (!id) {
    475. 

  475.     id = this.$activeClause[this.$activeClause.length - 1].id;
    476. 

  476.   }
    477. 

  477. 

  478.   if (this._pinnedIds[id]) {
    479. 

  479.     this.removePinEntry(id);
    480. 

  480.   } else {
    481. 

  481.     this.addPinEntry(id);
    482. 

  482.   }
    483. 

  483. }
    484. 

  484. 

  485. Menu.prototype.selectPin = function (num) {
    486. 

  486.   document.location = this.$pinList.children[num].children[0].href;
    487. 

  487. }
    488. 

  488. 

  489. var menu;
    490. 

  490. function init() {
    491. 

  491.   menu = new Menu();
    492. 

  492.   var $container = document.getElementById('spec-container');
    493. 

  493.   $container.addEventListener('mouseover', debounce(function (e) {
    494. 

  494.     Toolbox.activateIfMouseOver(e);
    495. 

  495.   }));
    496. 

  496. }
    497. 

  497. 

  498. document.addEventListener('DOMContentLoaded', init);
    499. 

  499. 

  500. function debounce(fn, opts) {
    501. 

  501.   opts = opts || {};
    502. 

  502.   var timeout;
    503. 

  503.   return function(e) {
    504. 

  504.     if (opts.stopPropagation) {
    505. 

  505.       e.stopPropagation();
    506. 

  506.     }
    507. 

  507.     var args = arguments;
    508. 

  508.     if (timeout) {
    509. 

  509.       clearTimeout(timeout);
    510. 

  510.     }
    511. 

  511.     timeout = setTimeout(function() {
    512. 

  512.       timeout = null;
    513. 

  513.       fn.apply(this, args);
    514. 

  514.     }.bind(this), 150);
    515. 

  515.   }
    516. 

  516. }
    517. 

  517. 

  518. var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX'];
    519. 

  519. function findLocalReferences ($elem) {
    520. 

  520.   var name = $elem.innerHTML;
    521. 

  521.   var references = [];
    522. 

  522. 

  523.   var parentClause = $elem.parentNode;
    524. 

  524.   while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) {
    525. 

  525.     parentClause = parentClause.parentNode;
    526. 

  526.   }
    527. 

  527. 

  528.   if(!parentClause) return;
    529. 

  529. 

  530.   var vars = parentClause.querySelectorAll('var');
    531. 

  531. 

  532.   for (var i = 0; i < vars.length; i++) {
    533. 

  533.     var $var = vars[i];
    534. 

  534. 

  535.     if ($var.innerHTML === name) {
    536. 

  536.       references.push($var);
    537. 

  537.     }
    538. 

  538.   }
    539. 

  539. 

  540.   return references;
    541. 

  541. }
    542. 

  542. 

  543. function toggleFindLocalReferences($elem) {
    544. 

  544.   var references = findLocalReferences($elem);
    545. 

  545.   if ($elem.classList.contains('referenced')) {
    546. 

  546.     references.forEach(function ($reference) {
    547. 

  547.       $reference.classList.remove('referenced');
    548. 

  548.     });
    549. 

  549.   } else {
    550. 

  550.     references.forEach(function ($reference) {
    551. 

  551.       $reference.classList.add('referenced');
    552. 

  552.     });
    553. 

  553.   }
    554. 

  554. }
    555. 

  555. 

  556. function installFindLocalReferences () {
    557. 

  557.   document.addEventListener('click', function (e) {
    558. 

  558.     if (e.target.nodeName === 'VAR') {
    559. 

  559.       toggleFindLocalReferences(e.target);
    560. 

  560.     }
    561. 

  561.   });
    562. 

  562. }
    563. 

  563. 

  564. document.addEventListener('DOMContentLoaded', installFindLocalReferences);
    565. 

  565. 

  566. 

  567. 

  568. 

  569. // The following license applies to the fuzzysearch function
    570. 

  570. // The MIT License (MIT)
    571. 

  571. // Copyright © 2015 Nicolas Bevacqua
    572. 

  572. // Copyright © 2016 Brian Terlson
    573. 

  573. // Permission is hereby granted, free of charge, to any person obtaining a copy of
    574. 

  574. // this software and associated documentation files (the "Software"), to deal in
    575. 

  575. // the Software without restriction, including without limitation the rights to
    576. 

  576. // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
    577. 

  577. // the Software, and to permit persons to whom the Software is furnished to do so,
    578. 

  578. // subject to the following conditions:
    579. 

  579. 

  580. // The above copyright notice and this permission notice shall be included in all
    581. 

  581. // copies or substantial portions of the Software.
    582. 

  582. 

  583. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    584. 

  584. // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
    585. 

  585. // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
    586. 

  586. // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
    587. 

  587. // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
    588. 

  588. // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    589. 

  589. function fuzzysearch (searchString, haystack, caseInsensitive) {
    590. 

  590.   var tlen = haystack.length;
    591. 

  591.   var qlen = searchString.length;
    592. 

  592.   var chunks = 1;
    593. 

  593.   var finding = false;
    594. 

  594.   var prefix = true;
    595. 

  595.   
    596. 

  596.   if (qlen > tlen) {
    597. 

  597.     return false;
    598. 

  598.   }
    599. 

  599.   
    600. 

  600.   if (qlen === tlen) {
    601. 

  601.     if (searchString === haystack) {
    602. 

  602.       return { caseMatch: true, chunks: 1, prefix: true };
    603. 

  603.     } else if (searchString.toLowerCase() === haystack.toLowerCase()) {
    604. 

  604.       return { caseMatch: false, chunks: 1, prefix: true };
    605. 

  605.     } else {
    606. 

  606.       return false;
    607. 

  607.     }
    608. 

  608.   }
    609. 

  609.   
    610. 

  610.   outer: for (var i = 0, j = 0; i < qlen; i++) {
    611. 

  611.     var nch = searchString[i];
    612. 

  612.     while (j < tlen) {
    613. 

  613.       var targetChar = haystack[j++];
    614. 

  614.       if (targetChar === nch) {
    615. 

  615.         finding = true;
    616. 

  616.         continue outer;
    617. 

  617.       }
    618. 

  618.       if (finding) {
    619. 

  619.         chunks++;
    620. 

  620.         finding = false;
    621. 

  621.       }
    622. 

  622.     }
    623. 

  623.     
    624. 

  624.     if (caseInsensitive) { return false }
    625. 

  625.     
    626. 

  626.     return fuzzysearch(searchString.toLowerCase(), haystack.toLowerCase(), true);
    627. 

  627.   }
    628. 

  628.   
    629. 

  629.   return { caseMatch: !caseInsensitive, chunks: chunks, prefix: j <= qlen };
    630. 

  630. }
    631. 

  631. 

  632. var Toolbox = {
    633. 

  633.   init: function () {
    634. 

  634.     this.$container = document.createElement('div');
    635. 

  635.     this.$container.classList.add('toolbox');
    636. 

  636.     this.$permalink = document.createElement('a');
    637. 

  637.     this.$permalink.textContent = 'Permalink';
    638. 

  638.     this.$pinLink = document.createElement('a');
    639. 

  639.     this.$pinLink.textContent = 'Pin';
    640. 

  640.     this.$pinLink.setAttribute('href', '#');
    641. 

  641.     this.$pinLink.addEventListener('click', function (e) {
    642. 

  642.       e.preventDefault();
    643. 

  643.       e.stopPropagation();
    644. 

  644.       menu.togglePinEntry(this.entry.id);
    645. 

  645.     }.bind(this));
    646. 

  646. 

  647.     this.$refsLink = document.createElement('a');
    648. 

  648.     this.$refsLink.setAttribute('href', '#');
    649. 

  649.     this.$refsLink.addEventListener('click', function (e) {
    650. 

  650.       e.preventDefault();
    651. 

  651.       e.stopPropagation();
    652. 

  652.       referencePane.showReferencesFor(this.entry);
    653. 

  653.     }.bind(this));
    654. 

  654.     this.$container.appendChild(this.$permalink);
    655. 

  655.     this.$container.appendChild(this.$pinLink);
    656. 

  656.     this.$container.appendChild(this.$refsLink);
    657. 

  657.     document.body.appendChild(this.$container);
    658. 

  658.   },
    659. 

  659. 

  660.   activate: function (el, entry, target) {
    661. 

  661.     if (el === this._activeEl) return;
    662. 

  662.     this.active = true;
    663. 

  663.     this.entry = entry;
    664. 

  664.     this.$container.classList.add('active');
    665. 

  665.     this.top = el.offsetTop - this.$container.offsetHeight - 10;
    666. 

  666.     this.left = el.offsetLeft;
    667. 

  667.     this.$container.setAttribute('style', 'left: ' + this.left + 'px; top: ' + this.top + 'px');
    668. 

  668.     this.updatePermalink();
    669. 

  669.     this.updateReferences();
    670. 

  670.     this._activeEl = el;
    671. 

  671.     if (this.top < document.body.scrollTop && el === target) {
    672. 

  672.       // don't scroll unless it's a small thing (< 200px)
    673. 

  673.       this.$container.scrollIntoView();
    674. 

  674.     }
    675. 

  675.   },
    676. 

  676. 

  677.   updatePermalink: function () {
    678. 

  678.     this.$permalink.setAttribute('href', '#' + this.entry.id);
    679. 

  679.   },
    680. 

  680. 

  681.   updateReferences: function () {
    682. 

  682.     this.$refsLink.textContent = 'References (' + this.entry.referencingIds.length + ')';
    683. 

  683.   },
    684. 

  684. 

  685.   activateIfMouseOver: function (e) {
    686. 

  686.     var ref = this.findReferenceUnder(e.target);
    687. 

  687.     if (ref && (!this.active || e.pageY > this._activeEl.offsetTop)) {
    688. 

  688.       var entry = menu.search.biblio.byId[ref.id];
    689. 

  689.       this.activate(ref.element, entry, e.target);
    690. 

  690.     } else if (this.active && ((e.pageY < this.top) || e.pageY > (this._activeEl.offsetTop + this._activeEl.offsetHeight))) {
    691. 

  691.       this.deactivate();
    692. 

  692.     }
    693. 

  693.   },
    694. 

  694. 

  695.   findReferenceUnder: function (el) {
    696. 

  696.     while (el) {
    697. 

  697.       var parent = el.parentNode;
    698. 

  698.       if (el.nodeName === 'H1' && parent.nodeName.match(/EMU-CLAUSE|EMU-ANNEX|EMU-INTRO/) && parent.id) {
    699. 

  699.         return { element: el, id: parent.id };
    700. 

  700.       } else if (el.nodeName.match(/EMU-(?!CLAUSE|XREF|ANNEX|INTRO)|DFN/) &&
    701. 

  701.                 el.id && el.id[0] !== '_') {
    702. 

  702.         if (el.nodeName === 'EMU-FIGURE' || el.nodeName === 'EMU-TABLE' || el.nodeName === 'EMU-EXAMPLE') {
    703. 

  703.           // return the figcaption element
    704. 

  704.           return { element: el.children[0].children[0], id: el.id };
    705. 

  705.         } else if (el.nodeName === 'EMU-PRODUCTION') {
    706. 

  706.           // return the LHS non-terminal element
    707. 

  707.           return { element: el.children[0], id: el.id };
    708. 

  708.         } else {
    709. 

  709.           return { element: el, id: el.id };
    710. 

  710.         }
    711. 

  711.       }
    712. 

  712.       el = parent;
    713. 

  713.     }
    714. 

  714.   },
    715. 

  715. 

  716.   deactivate: function () {
    717. 

  717.     this.$container.classList.remove('active');
    718. 

  718.     this._activeEl = null;
    719. 

  719.     this.activeElBounds = null;
    720. 

  720.     this.active = false;
    721. 

  721.   }
    722. 

  722. }
    723. 

  723. 

  724. var referencePane = {
    725. 

  725.   init: function() {
    726. 

  726.     this.$container = document.createElement('div');
    727. 

  727.     this.$container.setAttribute('id', 'references-pane-container');
    728. 

  728. 

  729.     var $spacer = document.createElement('div');
    730. 

  730.     $spacer.setAttribute('id', 'references-pane-spacer');
    731. 

  731. 

  732.     this.$pane = document.createElement('div');
    733. 

  733.     this.$pane.setAttribute('id', 'references-pane');
    734. 

  734. 

  735.     this.$container.appendChild($spacer);
    736. 

  736.     this.$container.appendChild(this.$pane);
    737. 

  737. 

  738.     this.$header = document.createElement('div');
    739. 

  739.     this.$header.classList.add('menu-pane-header');
    740. 

  740.     this.$header.textContent = 'References to ';
    741. 

  741.     this.$headerRefId = document.createElement('a');
    742. 

  742.     this.$header.appendChild(this.$headerRefId);
    743. 

  743.     this.$closeButton = document.createElement('span');
    744. 

  744.     this.$closeButton.setAttribute('id', 'references-pane-close');
    745. 

  745.     this.$closeButton.addEventListener('click', function (e) {
    746. 

  746.       this.deactivate();
    747. 

  747.     }.bind(this));
    748. 

  748.     this.$header.appendChild(this.$closeButton);
    749. 

  749. 

  750.     this.$pane.appendChild(this.$header);
    751. 

  751.     var tableContainer = document.createElement('div');
    752. 

  752.     tableContainer.setAttribute('id', 'references-pane-table-container');
    753. 

  753. 

  754.     this.$table = document.createElement('table');
    755. 

  755.     this.$table.setAttribute('id', 'references-pane-table');
    756. 

  756. 

  757.     this.$tableBody = this.$table.createTBody();
    758. 

  758. 

  759.     tableContainer.appendChild(this.$table);
    760. 

  760.     this.$pane.appendChild(tableContainer);
    761. 

  761. 

  762.     menu.$specContainer.appendChild(this.$container);
    763. 

  763.   },
    764. 

  764. 

  765.   activate: function () {
    766. 

  766.     this.$container.classList.add('active');
    767. 

  767.   },
    768. 

  768. 

  769.   deactivate: function () {
    770. 

  770.     this.$container.classList.remove('active');
    771. 

  771.   },
    772. 

  772. 

  773.   showReferencesFor(entry) {
    774. 

  774.     this.activate();
    775. 

  775.     var newBody = document.createElement('tbody');
    776. 

  776.     var previousId;
    777. 

  777.     var previousCell;
    778. 

  778.     var dupCount = 0;
    779. 

  779.     this.$headerRefId.textContent = '#' + entry.id;
    780. 

  780.     this.$headerRefId.setAttribute('href', '#' + entry.id);
    781. 

  781.     entry.referencingIds.map(function (id) {
    782. 

  782.       var target = document.getElementById(id);
    783. 

  783.       var cid = findParentClauseId(target);
    784. 

  784.       var clause = menu.search.biblio.byId[cid];
    785. 

  785.       var dupCount = 0;
    786. 

  786.       return { id: id, clause: clause }
    787. 

  787.     }).sort(function (a, b) {
    788. 

  788.       return sortByClauseNumber(a.clause, b.clause);
    789. 

  789.     }).forEach(function (record, i) {
    790. 

  790.       if (previousId === record.clause.id) {
    791. 

  791.         previousCell.innerHTML += ' (<a href="#' + record.id + '">' + (dupCount + 2) + '</a>)';
    792. 

  792.         dupCount++;
    793. 

  793.       } else {
    794. 

  794.         var row = newBody.insertRow();
    795. 

  795.         var cell = row.insertCell();
    796. 

  796.         cell.innerHTML = record.clause.number;
    797. 

  797.         cell = row.insertCell();
    798. 

  798.         cell.innerHTML = '<a href="#' + record.id + '">' + record.clause.titleHTML + '</a>';
    799. 

  799.         previousCell = cell;
    800. 

  800.         previousId = record.clause.id;
    801. 

  801.         dupCount = 0;
    802. 

  802.       }
    803. 

  803.     }, this);
    804. 

  804.     this.$table.removeChild(this.$tableBody);
    805. 

  805.     this.$tableBody = newBody;
    806. 

  806.     this.$table.appendChild(this.$tableBody);
    807. 

  807.   }
    808. 

  808. }
    809. 

  809. function findParentClauseId(node) {
    810. 

  810.   while (node && node.nodeName !== 'EMU-CLAUSE' && node.nodeName !== 'EMU-INTRO' && node.nodeName !== 'EMU-ANNEX') {
    811. 

  811.     node = node.parentNode;
    812. 

  812.   }
    813. 

  813.   if (!node) return null;
    814. 

  814.   return node.getAttribute('id');
    815. 

  815. }
    816. 

  816. 

  817. function sortByClauseNumber(c1, c2) {
    818. 

  818.   var c1c = c1.number.split('.');
    819. 

  819.   var c2c = c2.number.split('.');
    820. 

  820. 

  821.   for (var i = 0; i < c1c.length; i++) {
    822. 

  822.     if (i >= c2c.length) {
    823. 

  823.       return 1;
    824. 

  824.     }
    825. 

  825.     
    826. 

  826.     var c1 = c1c[i];
    827. 

  827.     var c2 = c2c[i];
    828. 

  828.     var c1cn = Number(c1);
    829. 

  829.     var c2cn = Number(c2);
    830. 

  830. 

  831.     if (Number.isNaN(c1cn) && Number.isNaN(c2cn)) {
    832. 

  832.       if (c1 > c2) {
    833. 

  833.         return 1;
    834. 

  834.       } else if (c1 < c2) {
    835. 

  835.         return -1;
    836. 

  836.       }
    837. 

  837.     } else if (!Number.isNaN(c1cn) && Number.isNaN(c2cn)) {
    838. 

  838.       return -1;
    839. 

  839.     } else if (Number.isNaN(c1cn) && !Number.isNaN(c2cn)) {
    840. 

  840.       return 1;
    841. 

  841.     } else if(c1cn > c2cn) {
    842. 

  842.       return 1;
    843. 

  843.     } else if (c1cn < c2cn) {
    844. 

  844.       return -1;
    845. 

  845.     }
    846. 

  846.   }
    847. 

  847. 

  848.   if (c1c.length === c2c.length) {
    849. 

  849.     return 0;
    850. 

  850.   }
    851. 

  851.   return -1;
    852. 

  852. }
    853. 

  853. 

  854. document.addEventListener('DOMContentLoaded', function () {
    855. 

  855.   Toolbox.init();
    856. 

  856.   referencePane.init();
    857. 

  857. })
    858. 

  858. var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX'];
    859. 

  859. function findLocalReferences ($elem) {
    860. 

  860.   var name = $elem.innerHTML;
    861. 

  861.   var references = [];
    862. 

  862. 

  863.   var parentClause = $elem.parentNode;
    864. 

  864.   while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) {
    865. 

  865.     parentClause = parentClause.parentNode;
    866. 

  866.   }
    867. 

  867. 

  868.   if(!parentClause) return;
    869. 

  869. 

  870.   var vars = parentClause.querySelectorAll('var');
    871. 

  871. 

  872.   for (var i = 0; i < vars.length; i++) {
    873. 

  873.     var $var = vars[i];
    874. 

  874. 

  875.     if ($var.innerHTML === name) {
    876. 

  876.       references.push($var);
    877. 

  877.     }
    878. 

  878.   }
    879. 

  879. 

  880.   return references;
    881. 

  881. }
    882. 

  882. 

  883. function toggleFindLocalReferences($elem) {
    884. 

  884.   var references = findLocalReferences($elem);
    885. 

  885.   if ($elem.classList.contains('referenced')) {
    886. 

  886.     references.forEach(function ($reference) {
    887. 

  887.       $reference.classList.remove('referenced');
    888. 

  888.     });
    889. 

  889.   } else {
    890. 

  890.     references.forEach(function ($reference) {
    891. 

  891.       $reference.classList.add('referenced');
    892. 

  892.     });
    893. 

  893.   }
    894. 

  894. }
    895. 

  895. 

  896. function installFindLocalReferences () {
    897. 

  897.   document.addEventListener('click', function (e) {
    898. 

  898.     if (e.target.nodeName === 'VAR') {
    899. 

  899.       toggleFindLocalReferences(e.target);
    900. 

  900.     }
    901. 

  901.   });
    902. 

  902. }
    903. 

  903. 

  904. document.addEventListener('DOMContentLoaded', installFindLocalReferences);
    905. 

  905. </script><style>body {
    906. 

  906.   display: flex;
    907. 

  907.   font-size: 18px;
    908. 

  908.   line-height: 1.5;
    909. 

  909.   font-family: Cambria, Palatino Linotype, Palatino, Liberation Serif, serif;
    910. 

  910.   padding: 0;
    911. 

  911.   margin: 0;
    912. 

  912.   color: #111;
    913. 

  913. }
    914. 

  914. 

  915. #spec-container {
    916. 

  916.   padding: 0 20px;
    917. 

  917.   flex-grow: 1;
    918. 

  918.   flex-basis: 66%;
    919. 

  919.   box-sizing: border-box;
    920. 

  920.   overflow: hidden;
    921. 

  921. }
    922. 

  922. 

  923. body.oldtoc {
    924. 

  924.   margin: 0 auto;
    925. 

  925. }
    926. 

  926. 

  927. a {
    928. 

  928.     text-decoration: none;
    929. 

  929.     color: #206ca7;
    930. 

  930. }
    931. 

  931. 

  932. a:visited {
    933. 

  933.   color: #206ca7;
    934. 

  934. }
    935. 

  935. 

  936. a:hover {
    937. 

  937.     text-decoration: underline;
    938. 

  938.     color: #239dee;
    939. 

  939. }
    940. 

  940. 

  941. 

  942. code {
    943. 

  943.     font-weight: bold;
    944. 

  944.     font-family: Consolas, Monaco, monospace;
    945. 

  945.     white-space: pre;
    946. 

  946. }
    947. 

  947. 

  948. pre code {
    949. 

  949.   font-weight: inherit;
    950. 

  950. }
    951. 

  951. 

  952. pre code.hljs {
    953. 

  953.   background-color: #fff;
    954. 

  954.   margin: 0;
    955. 

  955.   padding: 0;
    956. 

  956. }
    957. 

  957. 

  958. ol.toc {
    959. 

  959.     list-style: none;
    960. 

  960.     padding-left: 0;
    961. 

  961. }
    962. 

  962. 

  963. ol.toc ol.toc {
    964. 

  964.     padding-left: 2ex;
    965. 

  965.     list-style: none;
    966. 

  966. }
    967. 

  967. 

  968. var {
    969. 

  969.   color: #2aa198;
    970. 

  970.   transition: background-color 0.25s ease;
    971. 

  971.   cursor: pointer;
    972. 

  972. }
    973. 

  973. 

  974. var.referenced {
    975. 

  975.   background-color: #ffff33;
    976. 

  976. }
    977. 

  977. 

  978. emu-const {
    979. 

  979.   font-family: sans-serif;
    980. 

  980. }
    981. 

  981. 

  982. emu-val {
    983. 

  983.   font-weight: bold;
    984. 

  984. }
    985. 

  985. emu-alg ol, emu-alg ol ol ol ol {
    986. 

  986.     list-style-type: decimal;
    987. 

  987. }
    988. 

  988. 

  989. emu-alg ol ol, emu-alg ol ol ol ol ol {
    990. 

  990.     list-style-type: lower-alpha;
    991. 

  991. }
    992. 

  992. 

  993. emu-alg ol ol ol, ol ol ol ol ol ol {
    994. 

  994.     list-style-type: lower-roman;
    995. 

  995. }
    996. 

  996. 

  997. emu-eqn {
    998. 

  998.   display: block;
    999. 

  999.   margin-left: 4em;
    1000. 

  1000. }
    1001. 

  1001. 

  1002. emu-eqn.inline {
    1003. 

  1003.   display: inline;
    1004. 

  1004.   margin: 0;
    1005. 

  1005. }
    1006. 

  1006. 

  1007. emu-eqn div:first-child {
    1008. 

  1008.   margin-left: -2em;
    1009. 

  1009. }
    1010. 

  1010. 

  1011. emu-note {
    1012. 

  1012.     margin: 1em 0;
    1013. 

  1013.     color: #666;
    1014. 

  1014.     border-left: 5px solid #ccc;
    1015. 

  1015.     display: flex;
    1016. 

  1016.     flex-direction: row;
    1017. 

  1017. }
    1018. 

  1018. 

  1019. emu-note > span.note {
    1020. 

  1020.     flex-basis: 100px;
    1021. 

  1021.     min-width: 100px;
    1022. 

  1022.     flex-grow: 0;
    1023. 

  1023.     flex-shrink: 1;
    1024. 

  1024.     text-transform: uppercase;
    1025. 

  1025.     padding-left: 5px;
    1026. 

  1026. }
    1027. 

  1027. 

  1028. emu-note[type=editor] {
    1029. 

  1029.   border-left-color: #faa;
    1030. 

  1030. }
    1031. 

  1031. 

  1032. emu-note > div.note-contents {
    1033. 

  1033.   flex-grow: 1;
    1034. 

  1034.   flex-shrink: 1;
    1035. 

  1035. }
    1036. 

  1036. 

  1037. emu-note > div.note-contents > p:first-of-type {
    1038. 

  1038.   margin-top: 0;
    1039. 

  1039. }
    1040. 

  1040. 

  1041. emu-note > div.note-contents > p:last-of-type {
    1042. 

  1042.   margin-bottom: 0;
    1043. 

  1043. }
    1044. 

  1044. 

  1045. emu-figure {
    1046. 

  1046.   display: block;
    1047. 

  1047. }
    1048. 

  1048. 

  1049. emu-example {
    1050. 

  1050.   display: block;
    1051. 

  1051.   margin: 1em 3em;
    1052. 

  1052. }
    1053. 

  1053. 

  1054. emu-example figure figcaption {
    1055. 

  1055.   margin-top: 0.5em;
    1056. 

  1056.   text-align: left;
    1057. 

  1057. }
    1058. 

  1058. 

  1059. emu-figure figure,
    1060. 

  1060. emu-example figure,
    1061. 

  1061. emu-table figure {
    1062. 

  1062.   display: flex;
    1063. 

  1063.   flex-direction: column;
    1064. 

  1064.   align-items: center;
    1065. 

  1065. }
    1066. 

  1066. 

  1067. emu-production {
    1068. 

  1068.     display: block;
    1069. 

  1069.     margin-top: 1em;
    1070. 

  1070.     margin-bottom: 1em;
    1071. 

  1071.     margin-left: 5ex;
    1072. 

  1072. }
    1073. 

  1073. 

  1074. emu-grammar.inline, emu-production.inline,
    1075. 

  1075. emu-grammar.inline emu-production emu-rhs, emu-production.inline emu-rhs,
    1076. 

  1076. emu-grammar[collapsed] emu-production emu-rhs, emu-production[collapsed] emu-rhs {
    1077. 

  1077.     display: inline;
    1078. 

  1078.     padding-left: 1ex;
    1079. 

  1079.     margin-left: 0;
    1080. 

  1080. }
    1081. 

  1081. 

  1082. emu-grammar[collapsed] emu-production, emu-production[collapsed] {
    1083. 

  1083.     margin: 0;
    1084. 

  1084. }
    1085. 

  1085. 

  1086. emu-constraints {
    1087. 

  1087.     font-size: .75em;
    1088. 

  1088.     margin-right: 1ex;
    1089. 

  1089. }
    1090. 

  1090. 

  1091. emu-gann {
    1092. 

  1092.     margin-right: 1ex;
    1093. 

  1093. }
    1094. 

  1094. 

  1095. emu-gann emu-t:last-child,
    1096. 

  1096. emu-gann emu-nt:last-child {
    1097. 

  1097.     margin-right: 0;
    1098. 

  1098. }
    1099. 

  1099. 

  1100. emu-geq {
    1101. 

  1101.     margin-left: 1ex;
    1102. 

  1102.     font-weight: bold;
    1103. 

  1103. }
    1104. 

  1104. 

  1105. emu-oneof {
    1106. 

  1106.     font-weight: bold;
    1107. 

  1107.     margin-left: 1ex;
    1108. 

  1108. }
    1109. 

  1109. 

  1110. emu-nt {
    1111. 

  1111.     display: inline-block;
    1112. 

  1112.     font-style: italic;
    1113. 

  1113.     white-space: nowrap;
    1114. 

  1114.     text-indent: 0;
    1115. 

  1115. }
    1116. 

  1116. 

  1117. emu-nt a, emu-nt a:visited {
    1118. 

  1118.   color: #333;
    1119. 

  1119. }
    1120. 

  1120. 

  1121. emu-rhs emu-nt {
    1122. 

  1122.     margin-right: 1ex;
    1123. 

  1123. }
    1124. 

  1124. 

  1125. emu-t {
    1126. 

  1126.     display: inline-block;
    1127. 

  1127.     font-family: monospace;
    1128. 

  1128.     font-weight: bold;
    1129. 

  1129.     white-space: nowrap;
    1130. 

  1130.     text-indent: 0;
    1131. 

  1131. }
    1132. 

  1132. 

  1133. emu-production emu-t {
    1134. 

  1134.     margin-right: 1ex;
    1135. 

  1135. }
    1136. 

  1136. 

  1137. emu-rhs {
    1138. 

  1138.     display: block;
    1139. 

  1139.     padding-left: 75px;
    1140. 

  1140.     text-indent: -25px;
    1141. 

  1141. }
    1142. 

  1142. 

  1143. emu-mods {
    1144. 

  1144.     font-size: .85em;
    1145. 

  1145.     vertical-align: sub;
    1146. 

  1146.     font-style: normal;
    1147. 

  1147.     font-weight: normal;
    1148. 

  1148. }
    1149. 

  1149. 

  1150. emu-production[collapsed] emu-mods {
    1151. 

  1151.   display: none;
    1152. 

  1152. }
    1153. 

  1153. 

  1154. emu-params, emu-opt {
    1155. 

  1155.   margin-right: 1ex;
    1156. 

  1156.   font-family: monospace;
    1157. 

  1157. }
    1158. 

  1158. 

  1159. emu-params, emu-constraints {
    1160. 

  1160.   color: #2aa198;
    1161. 

  1161. }
    1162. 

  1162. 

  1163. emu-opt {
    1164. 

  1164.   color: #b58900;
    1165. 

  1165. }
    1166. 

  1166. 

  1167. emu-gprose {
    1168. 

  1168.     font-size: 0.9em;
    1169. 

  1169.     font-family: Helvetica, Arial, sans-serif;
    1170. 

  1170. }
    1171. 

  1171. 

  1172. h1.shortname {
    1173. 

  1173.   color: #f60;
    1174. 

  1174.   font-size: 1.5em;
    1175. 

  1175.   margin: 0;
    1176. 

  1176. }
    1177. 

  1177. 

  1178. h1.version {
    1179. 

  1179.   color: #f60;
    1180. 

  1180.   font-size: 1.5em;
    1181. 

  1181.   margin: 0;
    1182. 

  1182. }
    1183. 

  1183. 

  1184. h1.title {
    1185. 

  1185.   margin-top: 0;
    1186. 

  1186.   color: #f60;
    1187. 

  1187. }
    1188. 

  1188. 

  1189. h1.first {
    1190. 

  1190.   margin-top: 0;
    1191. 

  1191. }
    1192. 

  1192. 

  1193. h1, h2, h3, h4, h5, h6 {
    1194. 

  1194.     position: relative;
    1195. 

  1195. }
    1196. 

  1196. 

  1197. h1 .secnum {
    1198. 

  1198.   text-decoration: none;
    1199. 

  1199.   margin-right: 10px;
    1200. 

  1200. }
    1201. 

  1201. 

  1202. h1 span.title {
    1203. 

  1203.   order: 2;
    1204. 

  1204. }
    1205. 

  1205. 

  1206. 

  1207. h1 { font-size: 2.67em; margin-top: 2em; margin-bottom: 0; line-height: 1em;}
    1208. 

  1208. h2 { font-size: 2em; }
    1209. 

  1209. h3 { font-size: 1.56em; }
    1210. 

  1210. h4 { font-size: 1.25em; }
    1211. 

  1211. h5 { font-size: 1.11em; }
    1212. 

  1212. h6 { font-size: 1em; }
    1213. 

  1213. 

  1214. h1:hover span.utils {
    1215. 

  1215.   display: block;
    1216. 

  1216. }
    1217. 

  1217. 

  1218. span.utils {
    1219. 

  1219.   font-size: 18px;
    1220. 

  1220.   line-height: 18px;
    1221. 

  1221.   display: none;
    1222. 

  1222.   position: absolute;
    1223. 

  1223.   top: 100%;
    1224. 

  1224.   left: 0;
    1225. 

  1225.   right: 0;
    1226. 

  1226.   font-weight: normal;
    1227. 

  1227. }
    1228. 

  1228. 

  1229. span.utils:before {
    1230. 

  1230.     content: "⤷";
    1231. 

  1231.     display: inline-block;
    1232. 

  1232.     padding: 0 5px;
    1233. 

  1233. }
    1234. 

  1234. 

  1235. span.utils > * {
    1236. 

  1236.   display: inline-block;
    1237. 

  1237.   margin-right: 20px;
    1238. 

  1238. }
    1239. 

  1239. 

  1240. h1 span.utils span.anchor a,
    1241. 

  1241. h2 span.utils span.anchor a,
    1242. 

  1242. h3 span.utils span.anchor a,
    1243. 

  1243. h4 span.utils span.anchor a,
    1244. 

  1244. h5 span.utils span.anchor a,
    1245. 

  1245. h6 span.utils span.anchor a {
    1246. 

  1246.   text-decoration: none;
    1247. 

  1247.   font-variant: small-caps;
    1248. 

  1248. }
    1249. 

  1249. 

  1250. h1 span.utils span.anchor a:hover,
    1251. 

  1251. h2 span.utils span.anchor a:hover,
    1252. 

  1252. h3 span.utils span.anchor a:hover,
    1253. 

  1253. h4 span.utils span.anchor a:hover,
    1254. 

  1254. h5 span.utils span.anchor a:hover,
    1255. 

  1255. h6 span.utils span.anchor a:hover {
    1256. 

  1256.   color: #333;
    1257. 

  1257. }
    1258. 

  1258. 

  1259. emu-intro h1, emu-clause h1, emu-annex h1 { font-size: 2em; }
    1260. 

  1260. emu-intro h2, emu-clause h2, emu-annex h2 { font-size: 1.56em; }
    1261. 

  1261. emu-intro h3, emu-clause h3, emu-annex h3 { font-size: 1.25em; }
    1262. 

  1262. emu-intro h4, emu-clause h4, emu-annex h4 { font-size: 1.11em; }
    1263. 

  1263. emu-intro h5, emu-clause h5, emu-annex h5 { font-size: 1em; }
    1264. 

  1264. emu-intro h6, emu-clause h6, emu-annex h6 { font-size: 0.9em; }
    1265. 

  1265. emu-intro emu-intro h1, emu-clause emu-clause h1, emu-annex emu-annex h1 { font-size: 1.56em; }
    1266. 

  1266. emu-intro emu-intro h2, emu-clause emu-clause h2, emu-annex emu-annex h2 { font-size: 1.25em; }
    1267. 

  1267. emu-intro emu-intro h3, emu-clause emu-clause h3, emu-annex emu-annex h3 { font-size: 1.11em; }
    1268. 

  1268. emu-intro emu-intro h4, emu-clause emu-clause h4, emu-annex emu-annex h4 { font-size: 1em; }
    1269. 

  1269. emu-intro emu-intro h5, emu-clause emu-clause h5, emu-annex emu-annex h5 { font-size: 0.9em; }
    1270. 

  1270. emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex h1 { font-size: 1.25em; }
    1271. 

  1271. emu-intro emu-intro emu-intro h2, emu-clause emu-clause emu-clause h2, emu-annex emu-annex emu-annex h2 { font-size: 1.11em; }
    1272. 

  1272. emu-intro emu-intro emu-intro h3, emu-clause emu-clause emu-clause h3, emu-annex emu-annex emu-annex h3 { font-size: 1em; }
    1273. 

  1273. emu-intro emu-intro emu-intro h4, emu-clause emu-clause emu-clause h4, emu-annex emu-annex emu-annex h4 { font-size: 0.9em; }
    1274. 

  1274. emu-intro emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex emu-annex h1 { font-size: 1.11em; }
    1275. 

  1275. emu-intro emu-intro emu-intro emu-intro h2, emu-clause emu-clause emu-clause emu-clause h2, emu-annex emu-annex emu-annex emu-annex h2 { font-size: 1em; }
    1276. 

  1276. emu-intro emu-intro emu-intro emu-intro h3, emu-clause emu-clause emu-clause emu-clause h3, emu-annex emu-annex emu-annex emu-annex h3 { font-size: 0.9em; }
    1277. 

  1277. emu-intro emu-intro emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex emu-annex emu-annex h1 { font-size: 1em; }
    1278. 

  1278. emu-intro emu-intro emu-intro emu-intro emu-intro h2, emu-clause emu-clause emu-clause emu-clause emu-clause h2, emu-annex emu-annex emu-annex emu-annex emu-annex h2 { font-size: 0.9em; }
    1279. 

  1279. emu-intro emu-intro emu-intro emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex emu-annex emu-annex emu-annex h1 { font-size: 0.9em }
    1280. 

  1280. 

  1281. emu-clause, emu-intro, emu-annex {
    1282. 

  1282.     display: block;
    1283. 

  1283. }
    1284. 

  1284. 

  1285. /* Figures and tables */
    1286. 

  1286. figure { display: block; margin: 1em 0 3em 0; }
    1287. 

  1287. figure object { display: block; margin: 0 auto; }
    1288. 

  1288. figure table.real-table { margin: 0 auto; }
    1289. 

  1289. figure figcaption {
    1290. 

  1290.     display: block;
    1291. 

  1291.     color: #555555;
    1292. 

  1292.     font-weight: bold;
    1293. 

  1293.     text-align: center;
    1294. 

  1294. }
    1295. 

  1295. 

  1296. emu-table table {
    1297. 

  1297.   margin: 0 auto;
    1298. 

  1298. }
    1299. 

  1299. 

  1300. emu-table table, table.real-table {
    1301. 

  1301.     border-collapse: collapse;
    1302. 

  1302. }
    1303. 

  1303. 

  1304. emu-table td, emu-table th, table.real-table td, table.real-table th {
    1305. 

  1305.     border: 1px solid black;
    1306. 

  1306.     padding: 0.4em;
    1307. 

  1307.     vertical-align: baseline;
    1308. 

  1308. }
    1309. 

  1309. emu-table th, emu-table thead td, table.real-table th {
    1310. 

  1310.     background-color: #eeeeee;
    1311. 

  1311. }
    1312. 

  1312. 

  1313. /* Note: the left content edges of table.lightweight-table >tbody >tr >td
    1314. 

  1314.    and div.display line up. */
    1315. 

  1315. table.lightweight-table {
    1316. 

  1316.     border-collapse: collapse;
    1317. 

  1317.     margin: 0 0 0 1.5em;
    1318. 

  1318. }
    1319. 

  1319. table.lightweight-table td, table.lightweight-table th {
    1320. 

  1320.     border: none;
    1321. 

  1321.     padding: 0 0.5em;
    1322. 

  1322.     vertical-align: baseline;
    1323. 

  1323. }
    1324. 

  1324. 

  1325. /* diff styles */
    1326. 

  1326. ins {
    1327. 

  1327.     background-color: #e0f8e0;
    1328. 

  1328.     text-decoration: none;
    1329. 

  1329.     border-bottom: 1px solid #396;
    1330. 

  1330. }
    1331. 

  1331. 

  1332. del {
    1333. 

  1333.     background-color: #fee;
    1334. 

  1334. }
    1335. 

  1335. 

  1336. ins.block, del.block,
    1337. 

  1337. emu-production > ins, emu-production > del,
    1338. 

  1338. emu-grammar > ins, emu-grammar > del {
    1339. 

  1339.   display: block;
    1340. 

  1340. }
    1341. 

  1341. emu-rhs > ins, emu-rhs > del { 
    1342. 

  1342.   display: inline;
    1343. 

  1343. }
    1344. 

  1344. 

  1345. tr.ins > td > ins {
    1346. 

  1346.   border-bottom: none;
    1347. 

  1347. }
    1348. 

  1348. 

  1349. tr.ins > td {
    1350. 

  1350.   background-color: #e0f8e0;
    1351. 

  1351. }
    1352. 

  1352. 

  1353. tr.del > td {
    1354. 

  1354.   background-color: #fee;
    1355. 

  1355. }
    1356. 

  1356. 

  1357. /* Menu Styles */
    1358. 

  1358. #menu-toggle {
    1359. 

  1359.   font-size: 2em;
    1360. 

  1360. 

  1361.   position: fixed;
    1362. 

  1362.   top: 0;
    1363. 

  1363.   left: 0;
    1364. 

  1364.   width: 1.5em;
    1365. 

  1365.   height: 1.5em;
    1366. 

  1366.   z-index: 3;
    1367. 

  1367.   visibility: hidden;
    1368. 

  1368.   color: #1567a2;
    1369. 

  1369.   background-color: #fff;
    1370. 

  1370. 

  1371.   line-height: 1.5em;
    1372. 

  1372.   text-align: center;
    1373. 

  1373.   -webkit-touch-callout: none;
    1374. 

  1374.   -webkit-user-select: none;
    1375. 

  1375.   -khtml-user-select: none;
    1376. 

  1376.   -moz-user-select: none;
    1377. 

  1377.   -ms-user-select: none;
    1378. 

  1378.   user-select: none;;
    1379. 

  1379. 

  1380.   cursor: pointer;
    1381. 

  1381. }
    1382. 

  1382. 

  1383. #menu {
    1384. 

  1384.   display: flex;
    1385. 

  1385.   flex-direction: column;
    1386. 

  1386.   width: 33%; height: 100vh;
    1387. 

  1387.   max-width: 500px;
    1388. 

  1388.   box-sizing: border-box;
    1389. 

  1389.   background-color: #ddd;
    1390. 

  1390.   overflow: hidden;
    1391. 

  1391.   transition: opacity 0.1s linear;
    1392. 

  1392.   padding: 0 5px;
    1393. 

  1393.   position: fixed;
    1394. 

  1394.   left: 0; top: 0;
    1395. 

  1395.   border-right: 2px solid #bbb;
    1396. 

  1396. 

  1397.   z-index: 2;
    1398. 

  1398. }
    1399. 

  1399. 

  1400. #menu-spacer {
    1401. 

  1401.   flex-basis: 33%;
    1402. 

  1402.   max-width: 500px;
    1403. 

  1403.   flex-grow: 0;
    1404. 

  1404.   flex-shrink: 0;
    1405. 

  1405. }
    1406. 

  1406. 

  1407. #menu a {
    1408. 

  1408.   color: #1567a2;
    1409. 

  1409. }
    1410. 

  1410. 

  1411. #menu.active {
    1412. 

  1412.   display: flex;
    1413. 

  1413.   opacity: 1;
    1414. 

  1414.   z-index: 2;
    1415. 

  1415. }
    1416. 

  1416. 

  1417. #menu-pins {
    1418. 

  1418.   flex-grow: 1;
    1419. 

  1419.   display: none;
    1420. 

  1420. }
    1421. 

  1421. 

  1422. #menu-pins.active {
    1423. 

  1423.   display: block;
    1424. 

  1424. }
    1425. 

  1425. 

  1426. #menu-pins-list {
    1427. 

  1427.   margin: 0;
    1428. 

  1428.   padding: 0;
    1429. 

  1429.   counter-reset: pins-counter;
    1430. 

  1430. }
    1431. 

  1431. 

  1432. #menu-pins-list > li:before {
    1433. 

  1433.   content: counter(pins-counter);
    1434. 

  1434.   counter-increment: pins-counter;
    1435. 

  1435.   display: inline-block;
    1436. 

  1436.   width: 25px;
    1437. 

  1437.   text-align: center;
    1438. 

  1438.   border: 1px solid #bbb;
    1439. 

  1439.   padding: 2px;
    1440. 

  1440.   margin: 4px;
    1441. 

  1441.   box-sizing: border-box;
    1442. 

  1442.   line-height: 1em;
    1443. 

  1443.   background-color: #ccc;
    1444. 

  1444.   border-radius: 4px;
    1445. 

  1445. }
    1446. 

  1446. #menu-toc > ol {
    1447. 

  1447.   padding: 0;
    1448. 

  1448.   flex-grow: 1;
    1449. 

  1449. }
    1450. 

  1450. 

  1451. #menu-toc > ol li {
    1452. 

  1452.   padding: 0;
    1453. 

  1453. }
    1454. 

  1454. 

  1455. #menu-toc > ol , #menu-toc > ol ol {
    1456. 

  1456.   list-style-type: none;
    1457. 

  1457.   margin: 0;
    1458. 

  1458.   padding: 0;
    1459. 

  1459. }
    1460. 

  1460. 

  1461. #menu-toc > ol ol {
    1462. 

  1462.   padding-left: 0.75em;
    1463. 

  1463. }
    1464. 

  1464. 

  1465. #menu-toc li {
    1466. 

  1466.   text-overflow: ellipsis;
    1467. 

  1467.   overflow: hidden;
    1468. 

  1468.   white-space: nowrap;
    1469. 

  1469. }
    1470. 

  1470. 

  1471. #menu-toc .item-toggle {
    1472. 

  1472.   display: inline-block;
    1473. 

  1473.   transform: rotate(-45deg) translate(-5px, -5px);
    1474. 

  1474.   transition: transform 0.1s ease;
    1475. 

  1475.   text-align: center;
    1476. 

  1476.   width: 20px;
    1477. 

  1477. 

  1478.   color: #aab;
    1479. 

  1479. 

  1480.   -webkit-touch-callout: none;
    1481. 

  1481.   -webkit-user-select: none;
    1482. 

  1482.   -khtml-user-select: none;
    1483. 

  1483.   -moz-user-select: none;
    1484. 

  1484.   -ms-user-select: none;
    1485. 

  1485.   user-select: none;;
    1486. 

  1486. 

  1487.   cursor: pointer;
    1488. 

  1488. }
    1489. 

  1489. 

  1490. #menu-toc .item-toggle-none {
    1491. 

  1491.   display: inline-block;
    1492. 

  1492.   width: 20px;
    1493. 

  1493. }
    1494. 

  1494. 

  1495. #menu-toc li.active > .item-toggle {
    1496. 

  1496.   transform: rotate(45deg) translate(-5px, -5px);
    1497. 

  1497. }
    1498. 

  1498. 

  1499. #menu-toc li > ol {
    1500. 

  1500.   display: none;
    1501. 

  1501. }
    1502. 

  1502. 

  1503. #menu-toc li.active > ol {
    1504. 

  1504.   display: block;
    1505. 

  1505. }
    1506. 

  1506. 

  1507. #menu-toc li.revealed > a {
    1508. 

  1508.   background-color: #bbb;
    1509. 

  1509.   font-weight: bold;
    1510. 

  1510.   /*
    1511. 

  1511.   background-color: #222;
    1512. 

  1512.   color: #c6d8e4;
    1513. 

  1513.   */
    1514. 

  1514. }
    1515. 

  1515. 

  1516. #menu-toc li.revealed-leaf> a {
    1517. 

  1517.   color: #206ca7;
    1518. 

  1518.   /*
    1519. 

  1519.   background-color: #222;
    1520. 

  1520.   color: #c6d8e4;
    1521. 

  1521.   */
    1522. 

  1522. }
    1523. 

  1523. 

  1524. #menu-toc li.revealed > .item-toggle {
    1525. 

  1525.   transform: rotate(45deg) translate(-5px, -5px);
    1526. 

  1526. }
    1527. 

  1527. 

  1528. #menu-toc li.revealed > ol {
    1529. 

  1529.   display: block;
    1530. 

  1530. }
    1531. 

  1531. 

  1532. #menu-toc li > a {
    1533. 

  1533.   padding: 2px 5px;
    1534. 

  1534. }
    1535. 

  1535. 

  1536. #menu > * {
    1537. 

  1537.   margin-bottom: 5px;
    1538. 

  1538. }
    1539. 

  1539. 

  1540. .menu-pane-header {
    1541. 

  1541.   padding: 0 5px;
    1542. 

  1542.   text-transform: uppercase;
    1543. 

  1543.   background-color: #aaa;
    1544. 

  1544.   color: #335;
    1545. 

  1545.   font-weight: bold;
    1546. 

  1546.   letter-spacing: 2px;
    1547. 

  1547.   flex-grow: 0;
    1548. 

  1548.   flex-shrink: 0;
    1549. 

  1549.   font-size: 0.8em;
    1550. 

  1550. }
    1551. 

  1551. 

  1552. #menu-toc {
    1553. 

  1553.   display: flex;
    1554. 

  1554.   flex-direction: column;
    1555. 

  1555.   width: 100%;
    1556. 

  1556.   overflow: hidden;
    1557. 

  1557.   flex-grow: 1;
    1558. 

  1558. }
    1559. 

  1559. 

  1560. #menu-toc ol.toc {
    1561. 

  1561.   overflow-x: hidden;
    1562. 

  1562.   overflow-y: auto;
    1563. 

  1563. }
    1564. 

  1564. 

  1565. #menu-search {
    1566. 

  1566.   position: relative;
    1567. 

  1567.   flex-grow: 0;
    1568. 

  1568.   flex-shrink: 0;
    1569. 

  1569.   width: 100%;
    1570. 

  1570.   
    1571. 

  1571.   display: flex;
    1572. 

  1572.   flex-direction: column;
    1573. 

  1573.   
    1574. 

  1574.   max-height: 300px;
    1575. 

  1575. }
    1576. 

  1576. 

  1577. #menu-trace-list {
    1578. 

  1578.   display: none;
    1579. 

  1579. }
    1580. 

  1580. 

  1581. #menu-search-box {
    1582. 

  1582.   box-sizing: border-box;
    1583. 

  1583.   display: block;
    1584. 

  1584.   width: 100%;
    1585. 

  1585.   margin: 5px 0 0 0;
    1586. 

  1586.   font-size: 1em;
    1587. 

  1587.   padding: 2px;
    1588. 

  1588.   background-color: #bbb;
    1589. 

  1589.   border: 1px solid #999;
    1590. 

  1590. }
    1591. 

  1591. 

  1592. #menu-search-results {
    1593. 

  1593.   overflow-x: hidden;
    1594. 

  1594.   overflow-y: auto;
    1595. 

  1595. }
    1596. 

  1596. 

  1597. li.menu-search-result-clause:before {
    1598. 

  1598.     content: 'clause';
    1599. 

  1599.     width: 40px;
    1600. 

  1600.     display: inline-block;
    1601. 

  1601.     text-align: right;
    1602. 

  1602.     padding-right: 1ex;
    1603. 

  1603.     color: #666;
    1604. 

  1604.     font-size: 75%;
    1605. 

  1605. }
    1606. 

  1606. li.menu-search-result-op:before {
    1607. 

  1607.     content: 'op';
    1608. 

  1608.     width: 40px;
    1609. 

  1609.     display: inline-block;
    1610. 

  1610.     text-align: right;
    1611. 

  1611.     padding-right: 1ex;
    1612. 

  1612.     color: #666;
    1613. 

  1613.     font-size: 75%;
    1614. 

  1614. }
    1615. 

  1615. 

  1616. li.menu-search-result-prod:before {
    1617. 

  1617.     content: 'prod';
    1618. 

  1618.     width: 40px;
    1619. 

  1619.     display: inline-block;
    1620. 

  1620.     text-align: right;
    1621. 

  1621.     padding-right: 1ex;
    1622. 

  1622.     color: #666;
    1623. 

  1623.     font-size: 75%
    1624. 

  1624. }
    1625. 

  1625. 

  1626. 

  1627. li.menu-search-result-term:before {
    1628. 

  1628.     content: 'term';
    1629. 

  1629.     width: 40px;
    1630. 

  1630.     display: inline-block;
    1631. 

  1631.     text-align: right;
    1632. 

  1632.     padding-right: 1ex;
    1633. 

  1633.     color: #666;
    1634. 

  1634.     font-size: 75%
    1635. 

  1635. }
    1636. 

  1636. 

  1637. #menu-search-results ul {
    1638. 

  1638.   padding: 0 5px;
    1639. 

  1639.   margin: 0;
    1640. 

  1640. }
    1641. 

  1641. 

  1642. #menu-search-results li {
    1643. 

  1643.   white-space: nowrap;
    1644. 

  1644.   text-overflow: ellipsis;
    1645. 

  1645. }
    1646. 

  1646. 

  1647. 

  1648. #menu-trace-list {
    1649. 

  1649.   counter-reset: item;
    1650. 

  1650.   margin: 0 0 0 20px;
    1651. 

  1651.   padding: 0;
    1652. 

  1652. }
    1653. 

  1653. #menu-trace-list li {
    1654. 

  1654.   display: block;
    1655. 

  1655.   white-space: nowrap;
    1656. 

  1656. }
    1657. 

  1657. 

  1658. #menu-trace-list li .secnum:after {
    1659. 

  1659.   content: " ";
    1660. 

  1660. }
    1661. 

  1661. #menu-trace-list li:before {
    1662. 

  1662.     content: counter(item) " ";
    1663. 

  1663.     background-color: #222;
    1664. 

  1664.     counter-increment: item;
    1665. 

  1665.     color: #999;
    1666. 

  1666.     width: 20px;
    1667. 

  1667.     height: 20px;
    1668. 

  1668.     line-height: 20px;
    1669. 

  1669.     display: inline-block;
    1670. 

  1670.     text-align: center;
    1671. 

  1671.     margin: 2px 4px 2px 0;
    1672. 

  1672. }
    1673. 

  1673. 

  1674. @media (max-width: 1000px) {
    1675. 

  1675.   body {
    1676. 

  1676.     margin: 0;
    1677. 

  1677.     display: block;
    1678. 

  1678.   }
    1679. 

  1679. 

  1680.   #menu {
    1681. 

  1681.     display: none;
    1682. 

  1682.     padding-top: 3em;
    1683. 

  1683.     width: 450px;
    1684. 

  1684.   }
    1685. 

  1685. 

  1686.   #menu.active {
    1687. 

  1687.     position: fixed;
    1688. 

  1688.     height: 100%;
    1689. 

  1689.     left: 0;
    1690. 

  1690.     top: 0;
    1691. 

  1691.     right: 300px;
    1692. 

  1692.   }
    1693. 

  1693. 

  1694.   #menu-toggle {
    1695. 

  1695.     visibility: visible;
    1696. 

  1696.   }
    1697. 

  1697. 

  1698.   #spec-container {
    1699. 

  1699.     padding: 0 5px;
    1700. 

  1700.   }
    1701. 

  1701. 

  1702.   #references-pane-spacer {
    1703. 

  1703.     display: none;
    1704. 

  1704.   }
    1705. 

  1705. }
    1706. 

  1706. 

  1707. @media only screen and (max-width: 800px) {
    1708. 

  1708.   #menu {
    1709. 

  1709.     width: 100%;
    1710. 

  1710.   }
    1711. 

  1711. 

  1712.   h1 .secnum:empty {
    1713. 

  1713.     margin: 0; padding: 0;
    1714. 

  1714.   }
    1715. 

  1715. }
    1716. 

  1716. 

  1717. 

  1718. /* Toolbox */
    1719. 

  1719. .toolbox {
    1720. 

  1720. 	position: absolute;
    1721. 

  1721. 	background: #ddd;
    1722. 

  1722. 	border: 1px solid #aaa;
    1723. 

  1723.   display: none;
    1724. 

  1724.   color: #eee;
    1725. 

  1725.   padding: 5px;
    1726. 

  1726.   border-radius: 3px;
    1727. 

  1727. }
    1728. 

  1728. 

  1729. .toolbox.active {
    1730. 

  1730.   display: inline-block;
    1731. 

  1731. }
    1732. 

  1732. 

  1733. .toolbox a {
    1734. 

  1734.   text-decoration: none;
    1735. 

  1735.   padding: 0 5px;
    1736. 

  1736. }
    1737. 

  1737. 

  1738. .toolbox a:hover {
    1739. 

  1739.   text-decoration: underline;
    1740. 

  1740. }
    1741. 

  1741. 

  1742. .toolbox:after, .toolbox:before {
    1743. 

  1743. 	top: 100%;
    1744. 

  1744. 	left: 15px;
    1745. 

  1745. 	border: solid transparent;
    1746. 

  1746. 	content: " ";
    1747. 

  1747. 	height: 0;
    1748. 

  1748. 	width: 0;
    1749. 

  1749. 	position: absolute;
    1750. 

  1750. 	pointer-events: none;
    1751. 

  1751. }
    1752. 

  1752. 

  1753. .toolbox:after {
    1754. 

  1754. 	border-color: rgba(0, 0, 0, 0);
    1755. 

  1755. 	border-top-color: #ddd;
    1756. 

  1756. 	border-width: 10px;
    1757. 

  1757. 	margin-left: -10px;
    1758. 

  1758. }
    1759. 

  1759. .toolbox:before {
    1760. 

  1760. 	border-color: rgba(204, 204, 204, 0);
    1761. 

  1761. 	border-top-color: #aaa;
    1762. 

  1762. 	border-width: 12px;
    1763. 

  1763. 	margin-left: -12px;
    1764. 

  1764. }
    1765. 

  1765. 

  1766. #references-pane-container {
    1767. 

  1767.   position: fixed;
    1768. 

  1768.   bottom: 0;
    1769. 

  1769.   left: 0;
    1770. 

  1770.   right: 0;
    1771. 

  1771.   height: 250px;
    1772. 

  1772.   display: none;
    1773. 

  1773.   background-color: #ddd;
    1774. 

  1774.   z-index: 1;
    1775. 

  1775. }
    1776. 

  1776. 

  1777. #references-pane-table-container {
    1778. 

  1778.   overflow-x: hidden;
    1779. 

  1779.   overflow-y: auto;
    1780. 

  1780. }
    1781. 

  1781. 

  1782. #references-pane-spacer {
    1783. 

  1783.   flex-basis: 33%;
    1784. 

  1784.   max-width: 500px;
    1785. 

  1785. }
    1786. 

  1786. 

  1787. #references-pane {
    1788. 

  1788.   flex-grow: 1;
    1789. 

  1789.   overflow: hidden;
    1790. 

  1790.   display: flex;
    1791. 

  1791.   flex-direction: column;
    1792. 

  1792. }
    1793. 

  1793. 

  1794. #references-pane-container.active {
    1795. 

  1795.   display: flex;
    1796. 

  1796. }
    1797. 

  1797. 

  1798. #references-pane-close:after {
    1799. 

  1799.   content: '✖';
    1800. 

  1800.   float: right;
    1801. 

  1801.   cursor: pointer;
    1802. 

  1802. }
    1803. 

  1803. 

  1804. #references-pane table tr td:first-child {
    1805. 

  1805.   text-align: right;
    1806. 

  1806.   padding-right: 5px;
    1807. 

  1807. }
    1808. 

  1808. 

  1809. @media print {
    1810. 

  1810.   #menu-toggle {
    1811. 

  1811.     display: none; 
    1812. 

  1812.   }
    1813. 

  1813. }
    1814. 

  1814. </style></head><body><div id="menu-toggle">☰</div><div id="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#introduction" title="Metadata Proposal - ECMAScript">Metadata Proposal - ECMAScript</a></li><li><span class="item-toggle-none"></span><a href="#syntax" title="Syntax"><span class="secnum">1</span> Syntax</a></li><li><span class="item-toggle">◢</span><a href="#abstract-operations" title="Abstract Operations"><span class="secnum">2</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#operations-on-objects" title="Operations on Objects"><span class="secnum">2.1</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#getorcreatemetadatamap" title="GetOrCreateMetadataMap ( O, P, Create )"><span class="secnum">2.1.1</span> GetOrCreateMetadataMap ( O, P, Create )</a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-and-exotic-objects-behaviors" title="Ordinary and Exotic Objects Behaviors"><span class="secnum">3</span> Ordinary and Exotic Objects Behaviors</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots" title="Ordinary Object Internal Methods and Internal Slots"><span class="secnum">3.1</span> Ordinary Object Internal Methods and Internal Slots</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-hasmetadata" title="[[HasMetadata]] ( MetadataKey, P )"><span class="secnum">3.1.1</span> [[HasMetadata]] ( MetadataKey, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinaryhasmetadata" title="OrdinaryHasMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.1.1</span> OrdinaryHasMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-hasownmetadata" title="[[HasOwnMetadata]] ( MetadataKey, P )"><span class="secnum">3.1.2</span> [[HasOwnMetadata]] ( MetadataKey, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinaryhasownmetadata" title="OrdinaryHasOwnMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.2.1</span> OrdinaryHasOwnMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-getmetadata" title="[[GetMetadata]] ( MetadataKey, P )"><span class="secnum">3.1.3</span> [[GetMetadata]] ( MetadataKey, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarygetmetadata" title="OrdinaryGetMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.3.1</span> OrdinaryGetMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-getownmetadata" title="[[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )"><span class="secnum">3.1.4</span> [[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarygetownmetadata" title="OrdinaryGetOwnMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.4.1</span> OrdinaryGetOwnMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-defineownmetadata" title="[[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )"><span class="secnum">3.1.5</span> [[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarydefineownmetadata" title="OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )"><span class="secnum">3.1.5.1</span> OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-metadatakeys" title="[[MetadataKeys]] ( P )"><span class="secnum">3.1.6</span> [[MetadataKeys]] ( P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarymetadatakeys" title="OrdinaryMetadataKeys ( O, P )"><span class="secnum">3.1.6.1</span> OrdinaryMetadataKeys ( O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-ownmetadatakeys" title="[[OwnMetadataKeys]] ( P )"><span class="secnum">3.1.7</span> [[OwnMetadataKeys]] ( P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinaryownmetadatakeys" title="OrdinaryOwnMetadataKeys ( O, P )"><span class="secnum">3.1.7.1</span> OrdinaryOwnMetadataKeys ( O, P )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#ordinary-object-internal-methods-and-internal-slots-deletemetadata" title="[[DeleteMetadata]]( MetadataKey, P )"><span class="secnum">3.1.8</span> [[DeleteMetadata]]( MetadataKey, P )</a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#reflection" title="Reflection"><span class="secnum">4</span> Reflection</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#reflect" title="The Reflect Object"><span class="secnum">4.1</span> The Reflect Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#reflect-metadatadecoratorfunctions" title="Metadata Decorator Functions"><span class="secnum">4.1.1</span> Metadata Decorator Functions</a></li><li><span class="item-toggle-none"></span><a href="#reflect.metadata" title="Reflect.metadata ( metadataKey, metadataValue )"><span class="secnum">4.1.2</span> Reflect.metadata ( metadataKey, metadataValue )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.definemetadata" title="Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )"><span class="secnum">4.1.3</span> Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.hasmetadata" title="Reflect.hasMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.4</span> Reflect.hasMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.hasownmetadata" title="Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.5</span> Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getmetadata" title="Reflect.getMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.6</span> Reflect.getMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getownmetadata" title="Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.7</span> Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getmetadatakeys" title="Reflect.getMetadataKeys ( target [, propertyKey] )"><span class="secnum">4.1.8</span> Reflect.getMetadataKeys ( target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getownmetadatakeys" title="Reflect.getOwnMetadataKeys ( target [, propertyKey] )"><span class="secnum">4.1.9</span> Reflect.getOwnMetadataKeys ( target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.deletemetadata" title="Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.10</span> Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )</a></li></ol></li></ol></li></ol></div></div><div id="spec-container">
    1815. 

  1815. 

  1816. <emu-intro id="introduction">
    1817. 

  1817.   <h1 class="first">Metadata Proposal - ECMAScript</h1>
    1818. 

  1818.   <emu-note><span class="note">Note</span><div class="note-contents">A shim for this API can be found here:  <a href="https://github.com/rbuckton/ReflectDecorators">https://github.com/rbuckton/ReflectDecorators</a></div></emu-note>
    1819. 

  1819.   <p>Proposal to add Metadata to ECMAScript.</p>
    1820. 

  1820. </emu-intro>
    1821. 

  1821. 

  1822. <emu-clause id="syntax">
    1823. 

  1823.   <h1><span class="secnum">1</span>Syntax</h1>
    1824. 

  1824.   <emu-note><span class="note">Note</span><div class="note-contents">This section is non-normative.</div></emu-note>
    1825. 

  1825.   <pre><code class="javascript hljs"><span class="hljs-comment">// define metadata on an object or property</span>
    1826. 

  1826. <span class="hljs-built_in">Reflect</span>.defineMetadata(metadataKey, metadataValue, target);
    1827. 

  1827. <span class="hljs-built_in">Reflect</span>.defineMetadata(metadataKey, metadataValue, target, propertyKey);
    1828. 

  1828. 

  1829. <span class="hljs-comment">// check for presence of a metadata key on the prototype chain of an object or property</span>
    1830. 

  1830. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasMetadata(metadataKey, target);
    1831. 

  1831. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasMetadata(metadataKey, target, propertyKey);
    1832. 

  1832. 

  1833. <span class="hljs-comment">// check for presence of an own metadata key of an object or property</span>
    1834. 

  1834. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasOwnMetadata(metadataKey, target);
    1835. 

  1835. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasOwnMetadata(metadataKey, target, propertyKey);
    1836. 

  1836. 

  1837. <span class="hljs-comment">// get metadata value of a metadata key on the prototype chain of an object or property</span>
    1838. 

  1838. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadata(metadataKey, target);
    1839. 

  1839. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadata(metadataKey, target, propertyKey);
    1840. 

  1840. 

  1841. <span class="hljs-comment">// get metadata value of an own metadata key of an object or property</span>
    1842. 

  1842. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadata(metadataKey, target);
    1843. 

  1843. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadata(metadataKey, target, propertyKey);
    1844. 

  1844. 

  1845. <span class="hljs-comment">// get all metadata keys on the prototype chain of an object or property</span>
    1846. 

  1846. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadataKeys(target);
    1847. 

  1847. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadataKeys(target, propertyKey);
    1848. 

  1848. 

  1849. <span class="hljs-comment">// get all own metadata keys of an object or property</span>
    1850. 

  1850. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadataKeys(target);
    1851. 

  1851. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadataKeys(target, propertyKey);
    1852. 

  1852. 

  1853. <span class="hljs-comment">// delete metadata from an object or property</span>
    1854. 

  1854. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.deleteMetadata(metadataKey, target);
    1855. 

  1855. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.deleteMetadata(metadataKey, target, propertyKey);
    1856. 

  1856. 

  1857. <span class="hljs-comment">// apply metadata via a decorator to a constructor</span>
    1858. 

  1858. @<span class="hljs-built_in">Reflect</span>.metadata(metadataKey, metadataValue)
    1859. 

  1859. <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C</span> </span>{
    1860. 

  1860.   <span class="hljs-comment">// apply metadata via a decorator to a method (property)</span>
    1861. 

  1861.   @<span class="hljs-built_in">Reflect</span>.metadata(metadataKey, metadataValue)
    1862. 

  1862.   method() {
    1863. 

  1863.   }
    1864. 

  1864. }
    1865. 

  1865. 

  1866. <span class="hljs-comment">// Design-time type annotations</span>
    1867. 

  1867. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Type</span>(<span class="hljs-params">type</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">Reflect</span>.metadata(<span class="hljs-string">"design:type"</span>, type); }
    1868. 

  1868. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ParamTypes</span>(<span class="hljs-params">...types</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">Reflect</span>.metadata(<span class="hljs-string">"design:paramtypes"</span>, types); }
    1869. 

  1869. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ReturnType</span>(<span class="hljs-params">type</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">Reflect</span>.metadata(<span class="hljs-string">"design:returntype"</span>, type); }
    1870. 

  1870. 

  1871. <span class="hljs-comment">// Decorator application</span>
    1872. 

  1872. @ParamTypes(<span class="hljs-built_in">String</span>, <span class="hljs-built_in">Number</span>)
    1873. 

  1873. <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C</span> </span>{
    1874. 

  1874.   <span class="hljs-keyword">constructor</span>(text, i) {
    1875. 

  1875.   }
    1876. 

  1876. 

  1877.   @Type(<span class="hljs-built_in">String</span>)
    1878. 

  1878.   get name() { <span class="hljs-keyword">return</span> <span class="hljs-string">"text"</span>; }
    1879. 

  1879. 

  1880.   @Type(<span class="hljs-built_in">Function</span>)
    1881. 

  1881.   @ParamTypes(<span class="hljs-built_in">Number</span>, <span class="hljs-built_in">Number</span>)
    1882. 

  1882.   @ReturnType(<span class="hljs-built_in">Number</span>)
    1883. 

  1883.   add(x, y) {
    1884. 

  1884.     <span class="hljs-keyword">return</span> x + y;
    1885. 

  1885.   }
    1886. 

  1886. }
    1887. 

  1887. 

  1888. <span class="hljs-comment">// Metadata introspection</span>
    1889. 

  1889. <span class="hljs-keyword">let</span> obj = <span class="hljs-keyword">new</span> C(<span class="hljs-string">"a"</span>, <span class="hljs-number">1</span>);
    1890. 

  1890. <span class="hljs-keyword">let</span> paramTypes = <span class="hljs-built_in">Reflect</span>.getMetadata(<span class="hljs-string">"design:paramtypes"</span>, inst, <span class="hljs-string">"add"</span>); <span class="hljs-comment">// [Number, Number]</span></code></pre>
    1891. 

  1891. </emu-clause>
    1892. 

  1892. 

  1893. <emu-clause id="abstract-operations">
    1894. 

  1894.   <h1><span class="secnum">2</span>Abstract Operations</h1>
    1895. 

  1895.   <emu-clause id="operations-on-objects">
    1896. 

  1896.     <h1><span class="secnum">2.1</span>Operations on Objects</h1>
    1897. 

  1897.     <emu-clause id="getorcreatemetadatamap" aoid="GetOrCreateMetadataMap">
    1898. 

  1898.       <h1><span class="secnum">2.1.1</span>GetOrCreateMetadataMap ( O, P, Create )</h1>
    1899. 

  1899.       <p>When the abstract operation GetOrCreateMetadataMap is called with Object <var>O</var>, property key <var>P</var>, and Boolean <var>Create</var> the following steps are taken:</p>
    1900. 

  1900.       <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_0"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>targetMetadata</var> be the value of <var>O</var>'s [[Metadata]] internal slot.</li><li>If <var>targetMetadata</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>Create</var> is <emu-val>false</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Set <var>targetMetadata</var> to be a newly created <emu-val>Map</emu-val> object.</li><li>Set the [[Metadata]] internal slot of <var>O</var> to <var>targetMetadata</var>.</li></ol></li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="Invoke" id="_ref_1"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>targetMetadata</var>, <code>"get"</code>, <var>P</var>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>Create</var> is <emu-val>false</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Set <var>metadataMap</var> to be a newly created <emu-val>Map</emu-val> object.</li><li>Perform ?&nbsp;<emu-xref aoid="Invoke" id="_ref_2"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>targetMetadata</var>, <code>"set"</code>, <var>P</var>, <var>metadataMap</var>).</li></ol></li><li>Return <var>metadataMap</var>.
    1901. 

  1901.       </li></ol></emu-alg>
    1902. 

  1902.     </emu-clause>
    1903. 

  1903.   </emu-clause>
    1904. 

  1904. </emu-clause>
    1905. 

  1905. 

  1906. <emu-clause id="ordinary-and-exotic-objects-behaviors">
    1907. 

  1907.   <h1><span class="secnum">3</span>Ordinary and Exotic Objects Behaviors</h1>
    1908. 

  1908. 

  1909.   <emu-clause id="ordinary-object-internal-methods-and-internal-slots">
    1910. 

  1910.     <h1><span class="secnum">3.1</span>Ordinary Object Internal Methods and Internal Slots</h1>
    1911. 

  1911.     <p>All ordinary objects have an internal slot called [[Metadata]]. The value of this internal slot is either <emu-val>null</emu-val> or a <emu-val>Map</emu-val> object and is used for storing metadata for an object.</p>
    1912. 

  1912.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-hasmetadata">
    1913. 

  1913.       <h1><span class="secnum">3.1.1</span>[[HasMetadata]] ( MetadataKey, P )</h1>
    1914. 

  1914.       <p>When the [[HasMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>
    1915. 

  1915.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryHasMetadata" id="_ref_3"><a href="#ordinaryhasmetadata">OrdinaryHasMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).
    1916. 

  1916.       </li></ol></emu-alg>
    1917. 

  1917.       <emu-clause id="ordinaryhasmetadata" aoid="OrdinaryHasMetadata">
    1918. 

  1918.         <h1><span class="secnum">3.1.1.1</span>OrdinaryHasMetadata ( MetadataKey, O, P )</h1>
    1919. 

  1919.         <p>When the abstract operation OrdinaryHasMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>
    1920. 

  1920.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_4"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>hasOwn</var> be ?&nbsp;<emu-xref aoid="OrdinaryHasOwnMetadata" id="_ref_5"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).</li><li>If <var>hasOwn</var> is <emu-val>true</emu-val>, return <emu-val>true</emu-val>.</li><li>Let <var>parent</var> be ? <var>O</var>.[[GetPrototypeOf]]().</li><li>If <var>parent</var> is not <emu-val>null</emu-val>, Return ? <var>parent</var>.[[HasMetadata]](<var>MetadataKey</var>, <var>P</var>).</li><li>Return <emu-val>false</emu-val>.
    1921. 

  1921.         </li></ol></emu-alg>
    1922. 

  1922.       </emu-clause>
    1923. 

  1923.     </emu-clause>
    1924. 

  1924. 

  1925.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-hasownmetadata">
    1926. 

  1926.       <h1><span class="secnum">3.1.2</span>[[HasOwnMetadata]] ( MetadataKey, P )</h1>
    1927. 

  1927.       <p>When the [[HasOwnMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>
    1928. 

  1928.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryHasOwnMetadata" id="_ref_6"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).
    1929. 

  1929.       </li></ol></emu-alg>
    1930. 

  1930.       <emu-clause id="ordinaryhasownmetadata" aoid="OrdinaryHasOwnMetadata">
    1931. 

  1931.         <h1><span class="secnum">3.1.2.1</span>OrdinaryHasOwnMetadata ( MetadataKey, O, P )</h1>
    1932. 

  1932.         <p>When the abstract operation OrdinaryHasOwnMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>
    1933. 

  1933.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_7"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap" id="_ref_8"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="ToBoolean" id="_ref_9"><a href="https://tc39.github.io/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(? <emu-xref aoid="Invoke" id="_ref_10"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"has"</code>, <var>MetadataKey</var>)).
    1934. 

  1934.         </li></ol></emu-alg>
    1935. 

  1935.       </emu-clause>
    1936. 

  1936.     </emu-clause>
    1937. 

  1937. 

  1938.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-getmetadata">
    1939. 

  1939.       <h1><span class="secnum">3.1.3</span>[[GetMetadata]] ( MetadataKey, P )</h1>
    1940. 

  1940.       <p>When the [[GetMatadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>
    1941. 

  1941.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryGetMetadata" id="_ref_11"><a href="#ordinarygetmetadata">OrdinaryGetMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).
    1942. 

  1942.       </li></ol></emu-alg>
    1943. 

  1943.       <emu-clause id="ordinarygetmetadata" aoid="OrdinaryGetMetadata">
    1944. 

  1944.         <h1><span class="secnum">3.1.3.1</span>OrdinaryGetMetadata ( MetadataKey, O, P )</h1>
    1945. 

  1945.         <p>When the abstract operation OrdinaryGetMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>
    1946. 

  1946.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_12"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>hasOwn</var> be ?&nbsp;<emu-xref aoid="OrdinaryHasOwnMetadata" id="_ref_13"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).</li><li>If <var>hasOwn</var> is <emu-val>true</emu-val>, return ?&nbsp;<emu-xref aoid="OrdinaryGetOwnMetadata" id="_ref_14"><a href="#ordinarygetownmetadata">OrdinaryGetOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).</li><li>Let <var>parent</var> be ? <var>O</var>.[[GetPrototypeOf]]().</li><li>If <var>parent</var> is not <emu-val>null</emu-val>, return ? <var>parent</var>.[[GetMetadata]](<var>MetadataKey</var>, <var>P</var>).</li><li>Return <emu-val>undefined</emu-val>.
    1947. 

  1947.         </li></ol></emu-alg>
    1948. 

  1948.       </emu-clause>
    1949. 

  1949.     </emu-clause>
    1950. 

  1950. 

  1951.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-getownmetadata">
    1952. 

  1952.       <h1><span class="secnum">3.1.4</span>[[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )</h1>
    1953. 

  1953.       <p>When the [[GetOwnMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>
    1954. 

  1954.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryGetOwnMetadata" id="_ref_15"><a href="#ordinarygetownmetadata">OrdinaryGetOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).
    1955. 

  1955.       </li></ol></emu-alg>
    1956. 

  1956.       <emu-clause id="ordinarygetownmetadata" aoid="OrdinaryGetOwnMetadata">
    1957. 

  1957.         <h1><span class="secnum">3.1.4.1</span>OrdinaryGetOwnMetadata ( MetadataKey, O, P )</h1>
    1958. 

  1958.         <p>When the abstract operation OrdinaryGetOwnMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>
    1959. 

  1959.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_16"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap" id="_ref_17"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="Invoke" id="_ref_18"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"get"</code>, <var>MetadataKey</var>).
    1960. 

  1960.         </li></ol></emu-alg>
    1961. 

  1961.       </emu-clause>
    1962. 

  1962.     </emu-clause>
    1963. 

  1963. 

  1964.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-defineownmetadata">
    1965. 

  1965.       <h1><span class="secnum">3.1.5</span>[[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )</h1>
    1966. 

  1966.       <p>When the [[DefineOwnMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataValue</var>, and property key <var>P</var>, the following steps are taken:</p>
    1967. 

  1967.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryDefineOwnMetadata" id="_ref_19"><a href="#ordinarydefineownmetadata">OrdinaryDefineOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>MetadataValue</var>, <var>O</var>, <var>P</var>)
    1968. 

  1968.       </li></ol></emu-alg>
    1969. 

  1969.       <emu-clause id="ordinarydefineownmetadata" aoid="OrdinaryDefineOwnMetadata">
    1970. 

  1970.         <h1><span class="secnum">3.1.5.1</span>OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )</h1>
    1971. 

  1971.         <p>When the abstract operation <emu-xref aoid="OrdinaryDefineOwnProperty" id="_ref_20"><a href="https://tc39.github.io/ecma262/#sec-ordinarydefineownproperty">OrdinaryDefineOwnProperty</a></emu-xref> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataValue</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>
    1972. 

  1972.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_21"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap" id="_ref_22"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>true</emu-val>).</li><li>Return ?&nbsp;<emu-xref aoid="Invoke" id="_ref_23"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"set"</code>, <var>MetadataKey</var>, <var>MetadataValue</var>).
    1973. 

  1973.         </li></ol></emu-alg>
    1974. 

  1974.       </emu-clause>
    1975. 

  1975.     </emu-clause>
    1976. 

  1976. 

  1977.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-metadatakeys">
    1978. 

  1978.       <h1><span class="secnum">3.1.6</span>[[MetadataKeys]] ( P )</h1>
    1979. 

  1979.       <p>When the [[MetadataKeys]] internal method of <var>O</var> is called with property key <var>P</var> the following steps are taken:</p>
    1980. 

  1980.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryMetadataKeys" id="_ref_24"><a href="#ordinarymetadatakeys">OrdinaryMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>).
    1981. 

  1981.       </li></ol></emu-alg>
    1982. 

  1982.       <emu-clause id="ordinarymetadatakeys" aoid="OrdinaryMetadataKeys">
    1983. 

  1983.         <h1><span class="secnum">3.1.6.1</span>OrdinaryMetadataKeys ( O, P )</h1>
    1984. 

  1984.         <p>When the abstract operation OrdinaryMetadataKeys is called with Object <var>O</var> and property key <var>P</var> the following steps are taken:</p>
    1985. 

  1985.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_25"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>ownKeys</var> be ?&nbsp;<emu-xref aoid="OrdinaryOwnMetadataKeys" id="_ref_26"><a href="#ordinaryownmetadatakeys">OrdinaryOwnMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>).</li><li>Let <var>parent</var> be ? <var>O</var>.[[GetPrototypeOf]]().</li><li>If <var>parent</var> is <emu-val>null</emu-val>, then return <var>ownKeys</var>.</li><li>Let <var>parentKeys</var> be ? <var>O</var>.[[OrdinaryMetadataKeys]](<var>P</var>).</li><li>Let <var>ownKeysLen</var> = ?&nbsp;<emu-xref aoid="Get" id="_ref_27"><a href="https://tc39.github.io/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>ownKeys</var>, "length").</li><li>If <var>ownKeysLen</var> is <emu-val>0</emu-val>, return <var>parentKeys</var>.</li><li>Let <var>parentKeysLen</var> = ?&nbsp;<emu-xref aoid="Get" id="_ref_28"><a href="https://tc39.github.io/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>parentKeys</var>, "length").</li><li>If <var>parentKeysLen</var> is <emu-val>0</emu-val>, return <var>ownKeys</var>.</li><li>Let <var>set</var> be a newly created <emu-val>Set</emu-val> object.</li><li>Let <var>keys</var> be ?&nbsp;<emu-xref aoid="ArrayCreate" id="_ref_29"><a href="https://tc39.github.io/ecma262/#sec-arraycreate">ArrayCreate</a></emu-xref>(0).</li><li>Let <var>k</var> be <emu-val>0</emu-val>.</li><li>For each element <var>key</var> of <var>ownKeys</var><ol><li>Let <var>hasKey</var> be ?&nbsp;<emu-xref aoid="Invoke" id="_ref_30"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, <code>"has"</code>, <var>key</var>).</li><li>If <var>hasKey</var> is <emu-val>false</emu-val>, then<ol><li>Let <var>Pk</var> be !&nbsp;<emu-xref aoid="ToString" id="_ref_31"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Perform ?&nbsp;<emu-xref aoid="Invoke" id="_ref_32"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, "add", <var>key</var>).</li><li>Let <var>defineStatus</var> be <emu-xref aoid="CreateDataProperty" id="_ref_33"><a href="https://tc39.github.io/ecma262/#sec-createdataproperty">CreateDataProperty</a></emu-xref>(<var>keys</var>, <var>Pk</var>, <var>key</var>).</li><li>Assert: <var>defineStatus</var> is <emu-val>true</emu-val>.</li><li>Increase <var>k</var> by <emu-val>1</emu-val>.</li></ol></li></ol></li><li>For each element <var>key</var> of <var>parentKeys</var><ol><li>Let <var>hasKey</var> be ?&nbsp;<emu-xref aoid="Invoke" id="_ref_34"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, <code>"has"</code>, <var>key</var>).</li><li>If <var>hasKey</var> is <emu-val>false</emu-val>, then<ol><li>Let <var>Pk</var> be !&nbsp;<emu-xref aoid="ToString" id="_ref_35"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Perform ?&nbsp;<emu-xref aoid="Invoke" id="_ref_36"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, <code>"add"</code>, <var>key</var>).</li><li>Let <var>defineStatus</var> be <emu-xref aoid="CreateDataProperty" id="_ref_37"><a href="https://tc39.github.io/ecma262/#sec-createdataproperty">CreateDataProperty</a></emu-xref>(<var>keys</var>, <var>Pk</var>, <var>key</var>).</li><li>Assert: <var>defineStatus</var> is <emu-val>true</emu-val>.</li><li>Increase <var>k</var> by <emu-val>1</emu-val>.</li></ol></li></ol></li><li>Perform ?&nbsp;<emu-xref aoid="Set" id="_ref_38"><a href="https://tc39.github.io/ecma262/#sec-set-o-p-v-throw">Set</a></emu-xref>(<var>keys</var>, <code>"length"</code>, <var>k</var>).</li><li>return <var>keys</var>.
    1986. 

  1986.         </li></ol></emu-alg>
    1987. 

  1987.       </emu-clause>
    1988. 

  1988.     </emu-clause>
    1989. 

  1989. 

  1990.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-ownmetadatakeys">
    1991. 

  1991.       <h1><span class="secnum">3.1.7</span>[[OwnMetadataKeys]] ( P )</h1>
    1992. 

  1992.       <p>When the [[OwnMetadataKeys]] internal method of <var>O</var> is called with property key <var>P</var> the following steps are taken:</p>
    1993. 

  1993.       <emu-alg><ol><li>Return <emu-xref aoid="OrdinaryOwnMetadataKeys" id="_ref_39"><a href="#ordinaryownmetadatakeys">OrdinaryOwnMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>).
    1994. 

  1994.       </li></ol></emu-alg>
    1995. 

  1995.       <emu-clause id="ordinaryownmetadatakeys" aoid="OrdinaryOwnMetadataKeys">
    1996. 

  1996.         <h1><span class="secnum">3.1.7.1</span>OrdinaryOwnMetadataKeys ( O, P )</h1>
    1997. 

  1997.         <p>When the abstract operation OrdinaryOwnMetadataKeys is called with Object <var>O</var> and property key <var>P</var> the following steps are taken:</p>
    1998. 

  1998.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_40"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>keys</var> be ?&nbsp;<emu-xref aoid="ArrayCreate" id="_ref_41"><a href="https://tc39.github.io/ecma262/#sec-arraycreate">ArrayCreate</a></emu-xref>(0).</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap" id="_ref_42"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <var>keys</var>.</li><li>Let <var>keysObj</var> be ?&nbsp;<emu-xref aoid="Invoke" id="_ref_43"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"keys"</code>).</li><li>Let <var>iterator</var> be ?&nbsp;<emu-xref aoid="GetIterator" id="_ref_44"><a href="https://tc39.github.io/ecma262/#sec-getiterator">GetIterator</a></emu-xref>(<var>keysObj</var>).</li><li>Let <var>k</var> be <emu-val>0</emu-val>.</li><li>Repeat<ol><li>Let <var>Pk</var> be !&nbsp;<emu-xref aoid="ToString" id="_ref_45"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Let <var>next</var> be ?&nbsp;<emu-xref aoid="IteratorStep" id="_ref_46"><a href="https://tc39.github.io/ecma262/#sec-iteratorstep">IteratorStep</a></emu-xref>(<var>iterator</var>).</li><li>If <var>next</var> is <emu-val>false</emu-val>, then<ol><li>Let <var>setStatus</var> be ?&nbsp;<emu-xref aoid="Set" id="_ref_47"><a href="https://tc39.github.io/ecma262/#sec-set-o-p-v-throw">Set</a></emu-xref>(<var>keys</var>, <code>"length"</code>, <var>k</var>, <var>true</var>).</li><li>Assert: <var>setStatus</var> is <emu-val>true</emu-val>.</li><li>Return <var>keys</var>.</li></ol></li><li>Let <var>nextValue</var> be ?&nbsp;<emu-xref aoid="IteratorValue" id="_ref_48"><a href="https://tc39.github.io/ecma262/#sec-iteratorvalue">IteratorValue</a></emu-xref>(<var>next</var>).</li><li>Let <var>defineStatus</var> be <emu-xref aoid="CreateDataPropertyOrThrow" id="_ref_49"><a href="https://tc39.github.io/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>keys</var>, <var>Pk</var>, <var>nextValue</var>).</li><li>If <var>defineStatus</var> is an <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.github.io/ecma262/#sec-completion-record-specification-type">abrupt completion</a></emu-xref>, return ?&nbsp;<emu-xref aoid="IteratorClose" id="_ref_50"><a href="https://tc39.github.io/ecma262/#sec-iteratorclose">IteratorClose</a></emu-xref>(<var>iterator</var>, <var>defineStatus</var>).</li><li>Increase <var>k</var> by <emu-val>1</emu-val>.
    1999. 

  1999.         </li></ol></li></ol></emu-alg>
    2000. 

  2000.       </emu-clause>
    2001. 

  2001.     </emu-clause>
    2002. 

  2002. 

  2003.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-deletemetadata">
    2004. 

  2004.       <h1><span class="secnum">3.1.8</span>[[DeleteMetadata]]( MetadataKey, P )</h1>
    2005. 

  2005.       <p>When the [[DeleteMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var> the following steps are taken:</p>
    2006. 

  2006.       <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_51"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap" id="_ref_52"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="Invoke" id="_ref_53"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"delete"</code>, <var>MetadataKey</var>).
    2007. 

  2007.       </li></ol></emu-alg>
    2008. 

  2008.     </emu-clause>
    2009. 

  2009.   </emu-clause>
    2010. 

  2010. </emu-clause>
    2011. 

  2011. 

  2012. <emu-clause id="reflection">
    2013. 

  2013.   <h1><span class="secnum">4</span>Reflection</h1>
    2014. 

  2014.   <emu-clause id="reflect">
    2015. 

  2015.     <h1><span class="secnum">4.1</span>The Reflect Object</h1>
    2016. 

  2016.     <p>This section contains amendments to the Reflect object.</p>
    2017. 

  2017.     <emu-clause id="reflect-metadatadecoratorfunctions">
    2018. 

  2018.       <h1><span class="secnum">4.1.1</span>Metadata Decorator Functions</h1>
    2019. 

  2019.       <p>A metadata decorator function is an anonymous built-in function that has [[MetadataKey]] and [[MetadataValue]] internal slots.</p>
    2020. 

  2020.       <p>When a metadata decorator function <var>F</var> is called with arguments <var>target</var> and <var>key</var>, the following steps are taken:</p>
    2021. 

  2021.       <emu-alg><ol><li>Assert: <var>F</var> has a [[MetadataKey]] internal slot whose value is an <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>, or <emu-val>undefined</emu-val>.</li><li>Assert: <var>F</var> has a [[MetadataValue]] internal slot whose value is an <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>, or <emu-val>undefined</emu-val>.</li><li>If <emu-xref aoid="Type" id="_ref_54"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>key</var> is not <emu-val>undefined</emu-val> and <emu-xref aoid="IsPropertyKey" id="_ref_55"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>key</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>metadataKey</var> be the value of <var>F</var>'s [[MetadataKey]] internal slot.</li><li>Let <var>metadataValue</var> be the value of <var>F</var>'s [[MetadataValue]] internal slot.</li><li>Perform ? <var>target</var>.[[DefineMetadata]](<var>metadataKey</var>, <var>metadataValue</var>, <var>target</var>, <var>key</var>).</li><li>Return <emu-val>undefined</emu-val>.
    2022. 

  2022.       </li></ol></emu-alg>
    2023. 

  2023.     </emu-clause>
    2024. 

  2024. 

  2025.     <emu-clause id="reflect.metadata">
    2026. 

  2026.       <h1><span class="secnum">4.1.2</span>Reflect.metadata ( metadataKey, metadataValue )</h1>
    2027. 

  2027.       <p>When the <code>metadata</code> function is called with arguments <var>metadataKey</var> and <var>metadataValue</var>, the following steps are taken:</p>
    2028. 

  2028.       <emu-alg><ol><li>Let <var>decorator</var> be a new built-in function object as defined in Metadata Decorator Functions.</li><li>Set the [[MetadataKey]] internal slot of <var>decorator</var> to <var>metadataKey</var>.</li><li>Set the [[MetadataValue]] internal slot of <var>decorator</var> to <var>metadataValue</var>.</li><li>Return <var>decorator</var>.
    2029. 

  2029.       </li></ol></emu-alg>
    2030. 

  2030.     </emu-clause>
    2031. 

  2031. 

  2032.     <emu-clause id="reflect.definemetadata">
    2033. 

  2033.       <h1><span class="secnum">4.1.3</span>Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )</h1>
    2034. 

  2034.       <p>When the <code>defineMetadata</code> function is called with arguments <var>metadataKey</var>, <var>metadataValue</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>
    2035. 

  2035.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_56"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[DefineMetadata]](<var>metadataKey</var>, <var>metadataValue</var>, <var>propertyKey</var>).
    2036. 

  2036.       </li></ol></emu-alg>
    2037. 

  2037.     </emu-clause>
    2038. 

  2038. 

  2039.     <emu-clause id="reflect.hasmetadata">
    2040. 

  2040.       <h1><span class="secnum">4.1.4</span>Reflect.hasMetadata ( metadataKey, target [, propertyKey] )</h1>
    2041. 

  2041.       <p>When the <code>hasMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>
    2042. 

  2042.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_57"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[HasMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).
    2043. 

  2043.       </li></ol></emu-alg>
    2044. 

  2044.     </emu-clause>
    2045. 

  2045. 

  2046.     <emu-clause id="reflect.hasownmetadata">
    2047. 

  2047.       <h1><span class="secnum">4.1.5</span>Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )</h1>
    2048. 

  2048.       <p>When the <code>hasOwnMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>
    2049. 

  2049.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_58"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[HasOwn]](<var>metadataKey</var>, <var>propertyKey</var>).
    2050. 

  2050.       </li></ol></emu-alg>
    2051. 

  2051.     </emu-clause>
    2052. 

  2052. 

  2053.     <emu-clause id="reflect.getmetadata">
    2054. 

  2054.       <h1><span class="secnum">4.1.6</span>Reflect.getMetadata ( metadataKey, target [, propertyKey] )</h1>
    2055. 

  2055.       <p>When the <code>getMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>
    2056. 

  2056.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_59"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).
    2057. 

  2057.       </li></ol></emu-alg>
    2058. 

  2058.     </emu-clause>
    2059. 

  2059. 

  2060.     <emu-clause id="reflect.getownmetadata">
    2061. 

  2061.       <h1><span class="secnum">4.1.7</span>Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )</h1>
    2062. 

  2062.       <p>When the <code>getOwnMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>
    2063. 

  2063.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_60"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetOwnMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).
    2064. 

  2064.       </li></ol></emu-alg>
    2065. 

  2065.     </emu-clause>
    2066. 

  2066. 

  2067.     <emu-clause id="reflect.getmetadatakeys">
    2068. 

  2068.       <h1><span class="secnum">4.1.8</span>Reflect.getMetadataKeys ( target [, propertyKey] )</h1>
    2069. 

  2069.       <p>When the <code>getMetadataKeys</code> function is called with arguments <var>target</var> and <var>propertyKey</var>, the following steps are taken:</p>
    2070. 

  2070.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_61"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetMetadataKeys]](<var>propertyKey</var>).
    2071. 

  2071.       </li></ol></emu-alg>
    2072. 

  2072.     </emu-clause>
    2073. 

  2073. 

  2074.     <emu-clause id="reflect.getownmetadatakeys">
    2075. 

  2075.       <h1><span class="secnum">4.1.9</span>Reflect.getOwnMetadataKeys ( target [, propertyKey] )</h1>
    2076. 

  2076.       <p>When the <code>getOwnMetadataKeys</code> function is called with arguments <var>target</var> and <var>propertyKey</var>, the following steps are taken:</p>
    2077. 

  2077.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_62"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetOwnMetadataKeys]](<var>propertyKey</var>).
    2078. 

  2078.       </li></ol></emu-alg>
    2079. 

  2079.     </emu-clause>
    2080. 

  2080. 

  2081.     <emu-clause id="reflect.deletemetadata">
    2082. 

  2082.       <h1><span class="secnum">4.1.10</span>Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )</h1>
    2083. 

  2083.       <p>When the <code>deleteMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>
    2084. 

  2084.       <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_63"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[DeleteMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).
    2085. 

  2085.       </li></ol></emu-alg>
    2086. 

  2086.     </emu-clause>
    2087. 

  2087.   </emu-clause>
    2088. 

  2088. </emu-clause></div></body>
    2089.