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/* eslint-env browser, jquery */
/**
* md-toc.js v1.0.2
* https://github.com/yijian166/md-toc.js
*/
(function (window) {
function Toc (id, options) {
this.el = document.getElementById(id)
if (!this.el) return
this.options = options || {}
this.tocLevel = parseInt(options.level) || 0
this.tocClass = options['class'] || 'toc'
this.ulClass = options['ulClass']
this.tocTop = parseInt(options.top) || 0
this.elChilds = this.el.children
this.process = options['process']
if (!this.elChilds.length) return
this._init()
}
Toc.prototype._init = function () {
this._collectTitleElements()
this._createTocContent()
this._showToc()
}
Toc.prototype._collectTitleElements = function () {
this._elTitlesNames = []
this.elTitleElements = []
for (var i = 1; i < 6; i++) {
if (this.el.getElementsByTagName('h' + i).length) {
this._elTitlesNames.push('h' + i)
}
}
this._elTitlesNames.length = this._elTitlesNames.length > this.tocLevel ? this.tocLevel : this._elTitlesNames.length
for (var j = 0; j < this.elChilds.length; j++) {
this._elChildName = this.elChilds[j].tagName.toLowerCase()
if (this._elTitlesNames.toString().match(this._elChildName)) {
this.elTitleElements.push(this.elChilds[j])
}
}
}
Toc.prototype._createTocContent = function recursiveToc(level = 0, titleElements = [], titleNames = [], ulClass = undefined, index = 0) {
// Inititalize our elements from the toc object
// which is only available on level 0
if (level === 0) {
titleElements = this.elTitleElements
titleNames = this._elTitlesNames
ulClass = this.ulClass
}
// No need to do anything for an empty ToC
if (!titleElements.length) return
var content = '<ul'
if (ulClass) {
content += ' class="' + ulClass + '"'
}
content += '>\n'
var iterTag = titleNames[level]
var recurse = false
var openTag = false
for (var element; element = titleElements.shift();) {
var elementTag = element.tagName.toLowerCase()
// We only care about tags on our level to add them as list item
if (elementTag == iterTag) {
// Let's do some cleaning
var elementTitle = element.textContent.replace(/"/g, '"')
var elementText = (typeof this.process === 'function' ? this.process(element) : element.innerHTML).replace(/<(?:.|\n)*?>/gm, '')
var id = element.getAttribute('id')
if (!id) {
element.setAttribute('id', 'tip' + ++index)
id = '#tip' + index
} else {
id = '#' + id
}
if (openTag) {
content += '</li>\n'
openTag = false
}
content += '<li><a href="' + id + '" title="'+ elementTitle +'">' + elementText + '</a>'
// Reset recursion. We need it for the next subsections
recurse = false
openTag = true
// Check if the current element has a lower level than ours, if so, we have to go down the rabbithole!
} else if (!recurse && titleNames.indexOf(elementTag.toLowerCase()) > level) {
recurse = true
if (!openTag) {
content += '<li class="invisable-node">'
openTag = true
}
// This element is for the lower lever, we have to re-add it before we send the list down there.
titleElements.unshift(element)
// Let's call ourself and get to the next level
content += recursiveToc(level + 1, titleElements, titleNames, ulClass, index)
} else {
// When we end up here, met a higher level element
// This is not our business so back into the list with the element and let's end this loop
titleElements.unshift(element)
break
}
}
if (openTag) {
content += '</li>\n'
}
content += '</ul>\n'
// Set ToC content of the level 0 everything else pass things to the upper level!
if (level === 0) {
this.tocContent = content
} else {
return content
}
}
Toc.prototype._showToc = function () {
this.toc = document.createElement('div')
this.toc.innerHTML = this.tocContent
this.toc.setAttribute('class', this.tocClass)
if (!this.options.targetId) {
this.el.appendChild(this.toc)
} else {
document.getElementById(this.options.targetId).appendChild(this.toc)
}
var self = this
if (this.tocTop > -1) {
window.onscroll = function () {
var t = document.documentElement.scrollTop || document.body.scrollTop
if (t < self.tocTop) {
self.toc.setAttribute('style', 'position:absolute;top:' + self.tocTop + 'px;')
} else {
self.toc.setAttribute('style', 'position:fixed;top:10px;')
}
}
}
}
window.Toc = Toc
})(window)
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