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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 < 7; 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 () {
this._elTitleElementsLen = this.elTitleElements.length
if (!this._elTitleElementsLen) return
this.tocContent = ''
this._tempLists = []
for (var i = 0; i < this._elTitleElementsLen; i++) {
var j = i + 1
this._elTitleElement = this.elTitleElements[i]
this._elTitleElementName = this._elTitleElement.tagName
this._elTitleElementTitle = this._elTitleElement.textContent.replace(/"/g, '"')
this._elTitleElementText = (typeof this.process === 'function' ? this.process(this._elTitleElement) : this._elTitleElement.innerHTML).replace(/<(?:.|\n)*?>/gm, '')
var id = this._elTitleElement.getAttribute('id')
if (!id) {
this._elTitleElement.setAttribute('id', 'tip' + i)
id = '#tip' + i
} else {
id = '#' + id
}
this.tocContent += '<li><a href="' + id + '" title="'+ this._elTitleElementTitle +'">' + this._elTitleElementText + '</a>'
if (j !== this._elTitleElementsLen) {
this._elNextTitleElementName = this.elTitleElements[j].tagName
if (this._elTitleElementName !== this._elNextTitleElementName) {
var checkColse = false
var y = 1
for (var t = this._tempLists.length - 1; t >= 0; t--) {
if (this._tempLists[t].tagName === this._elNextTitleElementName) {
checkColse = true
break
}
y++
}
if (checkColse) {
this.tocContent += new Array(y + 1).join('</li></ul>')
this._tempLists.length = this._tempLists.length - y
} else {
this._tempLists.push(this._elTitleElement)
if (this.ulClass) { this.tocContent += '<ul class="' + this.ulClass + '">' } else { this.tocContent += '<ul>' }
}
} else {
this.tocContent += '</li>'
}
} else {
if (this._tempLists.length) {
this.tocContent += new Array(this._tempLists.length + 1).join('</li></ul>')
} else {
this.tocContent += '</li>'
}
}
}
if (this.ulClass) { this.tocContent = '<ul class="' + this.ulClass + '">' + this.tocContent + '</ul>' } else { this.tocContent = '<ul>' + this.tocContent + '</ul>' }
}
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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