356 lines
12 KiB
JavaScript
356 lines
12 KiB
JavaScript
/* eslint-env browser, jquery */
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import { preventXSS, escapeAttrValue } from './render'
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import { md } from './extra'
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/**
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* The reveal.js markdown plugin. Handles parsing of
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* markdown inside of presentations as well as loading
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* of external markdown documents.
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*/
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(function (root, factory) {
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if (typeof exports === 'object') {
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module.exports = factory()
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} else {
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// Browser globals (root is window)
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root.RevealMarkdown = factory()
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root.RevealMarkdown.initialize()
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}
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}(this, function () {
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const DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$'
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const DEFAULT_NOTES_SEPARATOR = '^note:'
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const DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\.element\\s*?(.+?)$'
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const DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\.slide:\\s*?(\\S.+?)$'
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const SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__'
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/**
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* Retrieves the markdown contents of a slide section
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* element. Normalizes leading tabs/whitespace.
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*/
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function getMarkdownFromSlide (section) {
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const template = section.querySelector('script')
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// strip leading whitespace so it isn't evaluated as code
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let text = (template || section).textContent
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// restore script end tags
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text = text.replace(new RegExp(SCRIPT_END_PLACEHOLDER, 'g'), '</script>')
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const leadingWs = text.match(/^\n?(\s*)/)[1].length
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const leadingTabs = text.match(/^\n?(\t*)/)[1].length
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if (leadingTabs > 0) {
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text = text.replace(new RegExp('\\n?\\t{' + leadingTabs + '}', 'g'), '\n')
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} else if (leadingWs > 1) {
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text = text.replace(new RegExp('\\n? {' + leadingWs + '}', 'g'), '\n')
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}
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return text
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}
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/**
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* Given a markdown slide section element, this will
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* return all arguments that aren't related to markdown
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* parsing. Used to forward any other user-defined arguments
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* to the output markdown slide.
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*/
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function getForwardedAttributes (section) {
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const attributes = section.attributes
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const result = []
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for (let i = 0, len = attributes.length; i < len; i++) {
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const name = attributes[i].name
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const value = attributes[i].value
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// disregard attributes that are used for markdown loading/parsing
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if (/data-(markdown|separator|vertical|notes)/gi.test(name)) continue
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if (value) {
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result.push(name + '="' + value + '"')
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} else {
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result.push(name)
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}
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}
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return result.join(' ')
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}
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/**
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* Inspects the given options and fills out default
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* values for what's not defined.
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*/
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function getSlidifyOptions (options) {
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options = options || {}
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options.separator = options.separator || DEFAULT_SLIDE_SEPARATOR
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options.notesSeparator = options.notesSeparator || DEFAULT_NOTES_SEPARATOR
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options.attributes = options.attributes || ''
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return options
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}
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/**
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* Helper function for constructing a markdown slide.
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*/
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function createMarkdownSlide (content, options) {
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options = getSlidifyOptions(options)
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const notesMatch = content.split(new RegExp(options.notesSeparator, 'mgi'))
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if (notesMatch.length === 2) {
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content = notesMatch[0] + '<aside class="notes" data-markdown>' + notesMatch[1].trim() + '</aside>'
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}
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// prevent script end tags in the content from interfering
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// with parsing
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content = content.replace(/<\/script>/gi, SCRIPT_END_PLACEHOLDER)
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return '<script type="text/template">' + content + '</script>'
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}
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/**
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* Parses a data string into multiple slides based
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* on the passed in separator arguments.
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*/
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function slidify (markdown, options) {
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options = getSlidifyOptions(options)
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const separatorRegex = new RegExp(options.separator + (options.verticalSeparator ? '|' + options.verticalSeparator : ''), 'mg')
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const horizontalSeparatorRegex = new RegExp(options.separator)
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let matches
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let lastIndex = 0
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let isHorizontal
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let wasHorizontal = true
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let content
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const sectionStack = []
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// iterate until all blocks between separators are stacked up
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while ((matches = separatorRegex.exec(markdown)) !== null) {
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// determine direction (horizontal by default)
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isHorizontal = horizontalSeparatorRegex.test(matches[0])
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if (!isHorizontal && wasHorizontal) {
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// create vertical stack
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sectionStack.push([])
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}
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// pluck slide content from markdown input
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content = markdown.substring(lastIndex, matches.index)
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if (isHorizontal && wasHorizontal) {
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// add to horizontal stack
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sectionStack.push(content)
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} else {
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// add to vertical stack
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sectionStack[sectionStack.length - 1].push(content)
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}
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lastIndex = separatorRegex.lastIndex
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wasHorizontal = isHorizontal
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}
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// add the remaining slide
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(wasHorizontal ? sectionStack : sectionStack[sectionStack.length - 1]).push(markdown.substring(lastIndex))
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let markdownSections = ''
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// flatten the hierarchical stack, and insert <section data-markdown> tags
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for (let i = 0, len = sectionStack.length; i < len; i++) {
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// vertical
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if (sectionStack[i] instanceof Array) {
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markdownSections += '<section ' + options.attributes + '>'
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sectionStack[i].forEach(function (child) {
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markdownSections += '<section data-markdown>' + createMarkdownSlide(child, options) + '</section>'
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})
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markdownSections += '</section>'
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} else {
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markdownSections += '<section ' + options.attributes + ' data-markdown>' + createMarkdownSlide(sectionStack[i], options) + '</section>'
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}
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}
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return markdownSections
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}
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/**
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* Parses any current data-markdown slides, splits
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* multi-slide markdown into separate sections and
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* handles loading of external markdown.
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*/
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function processSlides () {
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const sections = document.querySelectorAll('[data-markdown]')
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let section
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for (let i = 0, len = sections.length; i < len; i++) {
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section = sections[i]
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if (section.getAttribute('data-markdown').length) {
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const xhr = new XMLHttpRequest()
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const url = section.getAttribute('data-markdown')
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const datacharset = section.getAttribute('data-charset')
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// see https://developer.mozilla.org/en-US/docs/Web/API/element.getAttribute#Notes
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if (datacharset !== null && datacharset !== '') {
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xhr.overrideMimeType('text/html; charset=' + datacharset)
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}
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xhr.onreadystatechange = function () {
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if (xhr.readyState === 4) {
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// file protocol yields status code 0 (useful for local debug, mobile applications etc.)
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if ((xhr.status >= 200 && xhr.status < 300) || xhr.status === 0) {
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section.outerHTML = slidify(xhr.responseText, {
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separator: section.getAttribute('data-separator'),
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verticalSeparator: section.getAttribute('data-separator-vertical'),
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notesSeparator: section.getAttribute('data-separator-notes'),
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attributes: getForwardedAttributes(section)
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})
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} else {
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section.outerHTML = '<section data-state="alert">' +
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'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
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'Check your browser\'s JavaScript console for more details.' +
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'<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>' +
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'</section>'
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}
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}
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}
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xhr.open('GET', url, false)
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try {
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xhr.send()
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} catch (e) {
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alert('Failed to get the Markdown file ' + url + '. Make sure that the presentation and the file are served by a HTTP server and the file can be found there. ' + e)
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}
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} else if (section.getAttribute('data-separator') || section.getAttribute('data-separator-vertical') || section.getAttribute('data-separator-notes')) {
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section.outerHTML = slidify(getMarkdownFromSlide(section), {
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separator: section.getAttribute('data-separator'),
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verticalSeparator: section.getAttribute('data-separator-vertical'),
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notesSeparator: section.getAttribute('data-separator-notes'),
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attributes: getForwardedAttributes(section)
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})
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} else {
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section.innerHTML = createMarkdownSlide(getMarkdownFromSlide(section))
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}
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}
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}
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/**
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* Check if a node value has the attributes pattern.
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* If yes, extract it and add that value as one or several attributes
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* the the terget element.
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*
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* You need Cache Killer on Chrome to see the effect on any FOM transformation
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* directly on refresh (F5)
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* http://stackoverflow.com/questions/5690269/disabling-chrome-cache-for-website-development/7000899#answer-11786277
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*/
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function addAttributeInElement (node, elementTarget, separator) {
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const mardownClassesInElementsRegex = new RegExp(separator, 'mg')
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const mardownClassRegex = /([^"= ]+?)="([^"=]+?)"/mg
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let nodeValue = node.nodeValue
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let matches
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let matchesClass
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if ((matches = mardownClassesInElementsRegex.exec(nodeValue))) {
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const classes = matches[1]
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nodeValue = nodeValue.substring(0, matches.index) + nodeValue.substring(mardownClassesInElementsRegex.lastIndex)
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node.nodeValue = nodeValue
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while ((matchesClass = mardownClassRegex.exec(classes))) {
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const name = matchesClass[1]
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const value = matchesClass[2]
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if (name.substr(0, 5) === 'data-' || window.whiteListAttr.indexOf(name) !== -1) { elementTarget.setAttribute(name, escapeAttrValue(value)) }
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}
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return true
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}
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return false
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}
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/**
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* Add attributes to the parent element of a text node,
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* or the element of an attribute node.
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*/
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function addAttributes (section, element, previousElement, separatorElementAttributes, separatorSectionAttributes) {
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if (element != null && element.childNodes !== undefined && element.childNodes.length > 0) {
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let previousParentElement = element
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for (let i = 0; i < element.childNodes.length; i++) {
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const childElement = element.childNodes[i]
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if (i > 0) {
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let j = i - 1
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while (j >= 0) {
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const aPreviousChildElement = element.childNodes[j]
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if (typeof aPreviousChildElement.setAttribute === 'function' && aPreviousChildElement.tagName !== 'BR') {
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previousParentElement = aPreviousChildElement
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break
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}
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j = j - 1
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}
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}
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let parentSection = section
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if (childElement.nodeName === 'section') {
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parentSection = childElement
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previousParentElement = childElement
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}
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if (typeof childElement.setAttribute === 'function' || childElement.nodeType === Node.COMMENT_NODE) {
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addAttributes(parentSection, childElement, previousParentElement, separatorElementAttributes, separatorSectionAttributes)
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}
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}
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}
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if (element.nodeType === Node.COMMENT_NODE) {
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if (addAttributeInElement(element, previousElement, separatorElementAttributes) === false) {
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addAttributeInElement(element, section, separatorSectionAttributes)
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}
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}
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}
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/**
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* Converts any current data-markdown slides in the
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* DOM to HTML.
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*/
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function convertSlides () {
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const sections = document.querySelectorAll('[data-markdown]')
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for (let i = 0, len = sections.length; i < len; i++) {
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const section = sections[i]
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// Only parse the same slide once
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if (!section.getAttribute('data-markdown-parsed')) {
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section.setAttribute('data-markdown-parsed', true)
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const notes = section.querySelector('aside.notes')
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let markdown = getMarkdownFromSlide(section)
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markdown = markdown.replace(/</g, '<').replace(/>/g, '>')
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let rendered = md.render(markdown)
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rendered = preventXSS(rendered)
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const result = window.postProcess(rendered)
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section.innerHTML = result[0].outerHTML
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addAttributes(section, section, null, section.getAttribute('data-element-attributes') ||
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section.parentNode.getAttribute('data-element-attributes') ||
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DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR,
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section.getAttribute('data-attributes') ||
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section.parentNode.getAttribute('data-attributes') ||
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DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR)
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// If there were notes, we need to re-add them after
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// having overwritten the section's HTML
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if (notes) {
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section.appendChild(notes)
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}
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}
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}
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}
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// API
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return {
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initialize: function () {
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processSlides()
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convertSlides()
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},
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// TODO: Do these belong in the API?
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processSlides: processSlides,
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convertSlides: convertSlides,
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slidify: slidify
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}
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}))
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