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* Bootstrap Table of Contents v0.4.1 (http://afeld.github.io/bootstrap-toc/)
* Copyright 2015 Aidan Feldman
* Licensed under MIT (https://github.com/afeld/bootstrap-toc/blob/gh-pages/LICENSE.md) */
(function() {
'use strict';
window.Toc = {
helpers: {
// return all matching elements in the set, or their descendants
findOrFilter: function($el, selector) {
// http://danielnouri.org/notes/2011/03/14/a-jquery-find-that-also-finds-the-root-element/
// http://stackoverflow.com/a/12731439/358804
var $descendants = $el.find(selector);
return $el.filter(selector).add($descendants).filter(':not([data-toc-skip])');
},
generateUniqueIdBase: function(el) {
var text = $(el).text();
var anchor = text.trim().toLowerCase().replace(/[^A-Za-z0-9]+/g, '-');
return anchor || el.tagName.toLowerCase();
},
generateUniqueId: function(el) {
var anchorBase = this.generateUniqueIdBase(el);
for (var i = 0; ; i++) {
var anchor = anchorBase;
if (i > 0) {
// add suffix
anchor += '-' + i;
}
// check if ID already exists
if (!document.getElementById(anchor)) {
return anchor;
}
}
},
generateAnchor: function(el) {
if (el.id) {
return el.id;
} else {
var anchor = this.generateUniqueId(el);
el.id = anchor;
return anchor;
}
},
createNavList: function() {
return $('<ul class="nav"></ul>');
},
createChildNavList: function($parent) {
var $childList = this.createNavList();
$parent.append($childList);
return $childList;
},
generateNavEl: function(anchor, text) {
var $a = $('<a></a>');
$a.attr('href', '#' + anchor);
$a.text(text);
var $li = $('<li></li>');
$li.append($a);
return $li;
},
generateNavItem: function(headingEl) {
var anchor = this.generateAnchor(headingEl);
var $heading = $(headingEl);
var text = $heading.data('toc-text') || $heading.text();
return this.generateNavEl(anchor, text);
},
// Find the first heading level (`<h1>`, then `<h2>`, etc.) that has more than one element. Defaults to 1 (for `<h1>`).
getTopLevel: function($scope) {
for (var i = 1; i <= 6; i++) {
var $headings = this.findOrFilter($scope, 'h' + i);
if ($headings.length > 1) {
return i;
}
}
return 1;
},
// returns the elements for the top level, and the next below it
getHeadings: function($scope, topLevel) {
var topSelector = 'h' + topLevel;
var secondaryLevel = topLevel + 1;
var secondarySelector = 'h' + secondaryLevel;
return this.findOrFilter($scope, topSelector + ',' + secondarySelector);
},
getNavLevel: function(el) {
return parseInt(el.tagName.charAt(1), 10);
},
populateNav: function($topContext, topLevel, $headings) {
var $context = $topContext;
var $prevNav;
var helpers = this;
$headings.each(function(i, el) {
var $newNav = helpers.generateNavItem(el);
var navLevel = helpers.getNavLevel(el);
// determine the proper $context
if (navLevel === topLevel) {
// use top level
$context = $topContext;
} else if ($prevNav && $context === $topContext) {
// create a new level of the tree and switch to it
$context = helpers.createChildNavList($prevNav);
} // else use the current $context
$context.append($newNav);
$prevNav = $newNav;
});
},
parseOps: function(arg) {
var opts;
if (arg.jquery) {
opts = {
$nav: arg
};
} else {
opts = arg;
}
opts.$scope = opts.$scope || $(document.body);
return opts;
}
},
// accepts a jQuery object, or an options object
init: function(opts) {
opts = this.helpers.parseOps(opts);
// ensure that the data attribute is in place for styling
opts.$nav.attr('data-toggle', 'toc');
var $topContext = this.helpers.createChildNavList(opts.$nav);
var topLevel = this.helpers.getTopLevel(opts.$scope);
var $headings = this.helpers.getHeadings(opts.$scope, topLevel);
this.helpers.populateNav($topContext, topLevel, $headings);
}
};
$(function() {
$('nav[data-toggle="toc"]').each(function(i, el) {
var $nav = $(el);
Toc.init($nav);
});
});
})();
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