mirror of
https://github.com/hedgedoc/hedgedoc.git
synced 2024-12-27 10:11:18 +00:00
355 lines
12 KiB
JavaScript
355 lines
12 KiB
JavaScript
/* eslint-env browser, jquery */
|
|
|
|
import { preventXSS } from './render'
|
|
import { md } from './extra'
|
|
|
|
/**
|
|
* The reveal.js markdown plugin. Handles parsing of
|
|
* markdown inside of presentations as well as loading
|
|
* of external markdown documents.
|
|
*/
|
|
(function (root, factory) {
|
|
if (typeof exports === 'object') {
|
|
module.exports = factory()
|
|
} else {
|
|
// Browser globals (root is window)
|
|
root.RevealMarkdown = factory()
|
|
root.RevealMarkdown.initialize()
|
|
}
|
|
}(this, function () {
|
|
var DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$'
|
|
var DEFAULT_NOTES_SEPARATOR = '^note:'
|
|
var DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR = '\\.element\\s*?(.+?)$'
|
|
var DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR = '\\.slide:\\s*?(\\S.+?)$'
|
|
|
|
var SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__'
|
|
|
|
/**
|
|
* Retrieves the markdown contents of a slide section
|
|
* element. Normalizes leading tabs/whitespace.
|
|
*/
|
|
function getMarkdownFromSlide (section) {
|
|
var template = section.querySelector('script')
|
|
|
|
// strip leading whitespace so it isn't evaluated as code
|
|
var text = (template || section).textContent
|
|
|
|
// restore script end tags
|
|
text = text.replace(new RegExp(SCRIPT_END_PLACEHOLDER, 'g'), '</script>')
|
|
|
|
var leadingWs = text.match(/^\n?(\s*)/)[1].length
|
|
var leadingTabs = text.match(/^\n?(\t*)/)[1].length
|
|
|
|
if (leadingTabs > 0) {
|
|
text = text.replace(new RegExp('\\n?\\t{' + leadingTabs + '}', 'g'), '\n')
|
|
} else if (leadingWs > 1) {
|
|
text = text.replace(new RegExp('\\n? {' + leadingWs + '}', 'g'), '\n')
|
|
}
|
|
|
|
return text
|
|
}
|
|
|
|
/**
|
|
* Given a markdown slide section element, this will
|
|
* return all arguments that aren't related to markdown
|
|
* parsing. Used to forward any other user-defined arguments
|
|
* to the output markdown slide.
|
|
*/
|
|
function getForwardedAttributes (section) {
|
|
var attributes = section.attributes
|
|
var result = []
|
|
|
|
for (var i = 0, len = attributes.length; i < len; i++) {
|
|
var name = attributes[i].name
|
|
var value = attributes[i].value
|
|
|
|
// disregard attributes that are used for markdown loading/parsing
|
|
if (/data-(markdown|separator|vertical|notes)/gi.test(name)) continue
|
|
|
|
if (value) {
|
|
result.push(name + '="' + value + '"')
|
|
} else {
|
|
result.push(name)
|
|
}
|
|
}
|
|
|
|
return result.join(' ')
|
|
}
|
|
|
|
/**
|
|
* Inspects the given options and fills out default
|
|
* values for what's not defined.
|
|
*/
|
|
function getSlidifyOptions (options) {
|
|
options = options || {}
|
|
options.separator = options.separator || DEFAULT_SLIDE_SEPARATOR
|
|
options.notesSeparator = options.notesSeparator || DEFAULT_NOTES_SEPARATOR
|
|
options.attributes = options.attributes || ''
|
|
|
|
return options
|
|
}
|
|
|
|
/**
|
|
* Helper function for constructing a markdown slide.
|
|
*/
|
|
function createMarkdownSlide (content, options) {
|
|
options = getSlidifyOptions(options)
|
|
|
|
var notesMatch = content.split(new RegExp(options.notesSeparator, 'mgi'))
|
|
|
|
if (notesMatch.length === 2) {
|
|
content = notesMatch[0] + '<aside class="notes" data-markdown>' + notesMatch[1].trim() + '</aside>'
|
|
}
|
|
|
|
// prevent script end tags in the content from interfering
|
|
// with parsing
|
|
content = content.replace(/<\/script>/g, SCRIPT_END_PLACEHOLDER)
|
|
|
|
return '<script type="text/template">' + content + '</script>'
|
|
}
|
|
|
|
/**
|
|
* Parses a data string into multiple slides based
|
|
* on the passed in separator arguments.
|
|
*/
|
|
function slidify (markdown, options) {
|
|
options = getSlidifyOptions(options)
|
|
|
|
var separatorRegex = new RegExp(options.separator + (options.verticalSeparator ? '|' + options.verticalSeparator : ''), 'mg')
|
|
var horizontalSeparatorRegex = new RegExp(options.separator)
|
|
|
|
var matches
|
|
var lastIndex = 0
|
|
var isHorizontal
|
|
var wasHorizontal = true
|
|
var content
|
|
var sectionStack = []
|
|
|
|
// iterate until all blocks between separators are stacked up
|
|
while ((matches = separatorRegex.exec(markdown)) !== null) {
|
|
// determine direction (horizontal by default)
|
|
isHorizontal = horizontalSeparatorRegex.test(matches[0])
|
|
|
|
if (!isHorizontal && wasHorizontal) {
|
|
// create vertical stack
|
|
sectionStack.push([])
|
|
}
|
|
|
|
// pluck slide content from markdown input
|
|
content = markdown.substring(lastIndex, matches.index)
|
|
|
|
if (isHorizontal && wasHorizontal) {
|
|
// add to horizontal stack
|
|
sectionStack.push(content)
|
|
} else {
|
|
// add to vertical stack
|
|
sectionStack[sectionStack.length - 1].push(content)
|
|
}
|
|
|
|
lastIndex = separatorRegex.lastIndex
|
|
wasHorizontal = isHorizontal
|
|
}
|
|
|
|
// add the remaining slide
|
|
(wasHorizontal ? sectionStack : sectionStack[sectionStack.length - 1]).push(markdown.substring(lastIndex))
|
|
|
|
var markdownSections = ''
|
|
|
|
// flatten the hierarchical stack, and insert <section data-markdown> tags
|
|
for (var i = 0, len = sectionStack.length; i < len; i++) {
|
|
// vertical
|
|
if (sectionStack[i] instanceof Array) {
|
|
markdownSections += '<section ' + options.attributes + '>'
|
|
|
|
sectionStack[i].forEach(function (child) {
|
|
markdownSections += '<section data-markdown>' + createMarkdownSlide(child, options) + '</section>'
|
|
})
|
|
|
|
markdownSections += '</section>'
|
|
} else {
|
|
markdownSections += '<section ' + options.attributes + ' data-markdown>' + createMarkdownSlide(sectionStack[i], options) + '</section>'
|
|
}
|
|
}
|
|
|
|
return markdownSections
|
|
}
|
|
|
|
/**
|
|
* Parses any current data-markdown slides, splits
|
|
* multi-slide markdown into separate sections and
|
|
* handles loading of external markdown.
|
|
*/
|
|
function processSlides () {
|
|
var sections = document.querySelectorAll('[data-markdown]')
|
|
var section
|
|
|
|
for (var i = 0, len = sections.length; i < len; i++) {
|
|
section = sections[i]
|
|
|
|
if (section.getAttribute('data-markdown').length) {
|
|
var xhr = new XMLHttpRequest()
|
|
var url = section.getAttribute('data-markdown')
|
|
|
|
var datacharset = section.getAttribute('data-charset')
|
|
|
|
// see https://developer.mozilla.org/en-US/docs/Web/API/element.getAttribute#Notes
|
|
if (datacharset !== null && datacharset !== '') {
|
|
xhr.overrideMimeType('text/html; charset=' + datacharset)
|
|
}
|
|
|
|
xhr.onreadystatechange = function () {
|
|
if (xhr.readyState === 4) {
|
|
// file protocol yields status code 0 (useful for local debug, mobile applications etc.)
|
|
if ((xhr.status >= 200 && xhr.status < 300) || xhr.status === 0) {
|
|
section.outerHTML = slidify(xhr.responseText, {
|
|
separator: section.getAttribute('data-separator'),
|
|
verticalSeparator: section.getAttribute('data-separator-vertical'),
|
|
notesSeparator: section.getAttribute('data-separator-notes'),
|
|
attributes: getForwardedAttributes(section)
|
|
})
|
|
} else {
|
|
section.outerHTML = '<section data-state="alert">' +
|
|
'ERROR: The attempt to fetch ' + url + ' failed with HTTP status ' + xhr.status + '.' +
|
|
'Check your browser\'s JavaScript console for more details.' +
|
|
'<p>Remember that you need to serve the presentation HTML from a HTTP server.</p>' +
|
|
'</section>'
|
|
}
|
|
}
|
|
}
|
|
|
|
xhr.open('GET', url, false)
|
|
|
|
try {
|
|
xhr.send()
|
|
} catch (e) {
|
|
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)
|
|
}
|
|
} else if (section.getAttribute('data-separator') || section.getAttribute('data-separator-vertical') || section.getAttribute('data-separator-notes')) {
|
|
section.outerHTML = slidify(getMarkdownFromSlide(section), {
|
|
separator: section.getAttribute('data-separator'),
|
|
verticalSeparator: section.getAttribute('data-separator-vertical'),
|
|
notesSeparator: section.getAttribute('data-separator-notes'),
|
|
attributes: getForwardedAttributes(section)
|
|
})
|
|
} else {
|
|
section.innerHTML = createMarkdownSlide(getMarkdownFromSlide(section))
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if a node value has the attributes pattern.
|
|
* If yes, extract it and add that value as one or several attributes
|
|
* the the terget element.
|
|
*
|
|
* You need Cache Killer on Chrome to see the effect on any FOM transformation
|
|
* directly on refresh (F5)
|
|
* http://stackoverflow.com/questions/5690269/disabling-chrome-cache-for-website-development/7000899#answer-11786277
|
|
*/
|
|
function addAttributeInElement (node, elementTarget, separator) {
|
|
var mardownClassesInElementsRegex = new RegExp(separator, 'mg')
|
|
var mardownClassRegex = new RegExp('([^"= ]+?)="([^"=]+?)"', 'mg')
|
|
var nodeValue = node.nodeValue
|
|
var matches
|
|
var matchesClass
|
|
if ((matches = mardownClassesInElementsRegex.exec(nodeValue))) {
|
|
var classes = matches[1]
|
|
nodeValue = nodeValue.substring(0, matches.index) + nodeValue.substring(mardownClassesInElementsRegex.lastIndex)
|
|
node.nodeValue = nodeValue
|
|
while ((matchesClass = mardownClassRegex.exec(classes))) {
|
|
var name = matchesClass[1]
|
|
var value = matchesClass[2]
|
|
if (name.substr(0, 5) === 'data-' || window.whiteListAttr.indexOf(name) !== -1) { elementTarget.setAttribute(name, window.filterXSS.escapeAttrValue(value)) }
|
|
}
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
/**
|
|
* Add attributes to the parent element of a text node,
|
|
* or the element of an attribute node.
|
|
*/
|
|
function addAttributes (section, element, previousElement, separatorElementAttributes, separatorSectionAttributes) {
|
|
if (element != null && element.childNodes !== undefined && element.childNodes.length > 0) {
|
|
var previousParentElement = element
|
|
for (var i = 0; i < element.childNodes.length; i++) {
|
|
var childElement = element.childNodes[i]
|
|
if (i > 0) {
|
|
let j = i - 1
|
|
while (j >= 0) {
|
|
var aPreviousChildElement = element.childNodes[j]
|
|
if (typeof aPreviousChildElement.setAttribute === 'function' && aPreviousChildElement.tagName !== 'BR') {
|
|
previousParentElement = aPreviousChildElement
|
|
break
|
|
}
|
|
j = j - 1
|
|
}
|
|
}
|
|
var parentSection = section
|
|
if (childElement.nodeName === 'section') {
|
|
parentSection = childElement
|
|
previousParentElement = childElement
|
|
}
|
|
if (typeof childElement.setAttribute === 'function' || childElement.nodeType === Node.COMMENT_NODE) {
|
|
addAttributes(parentSection, childElement, previousParentElement, separatorElementAttributes, separatorSectionAttributes)
|
|
}
|
|
}
|
|
}
|
|
|
|
if (element.nodeType === Node.COMMENT_NODE) {
|
|
if (addAttributeInElement(element, previousElement, separatorElementAttributes) === false) {
|
|
addAttributeInElement(element, section, separatorSectionAttributes)
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Converts any current data-markdown slides in the
|
|
* DOM to HTML.
|
|
*/
|
|
function convertSlides () {
|
|
var sections = document.querySelectorAll('[data-markdown]')
|
|
|
|
for (var i = 0, len = sections.length; i < len; i++) {
|
|
var section = sections[i]
|
|
|
|
// Only parse the same slide once
|
|
if (!section.getAttribute('data-markdown-parsed')) {
|
|
section.setAttribute('data-markdown-parsed', true)
|
|
|
|
var notes = section.querySelector('aside.notes')
|
|
var markdown = getMarkdownFromSlide(section)
|
|
markdown = markdown.replace(/</g, '<').replace(/>/g, '>')
|
|
var rendered = md.render(markdown)
|
|
rendered = preventXSS(rendered)
|
|
var result = window.postProcess(rendered)
|
|
section.innerHTML = result[0].outerHTML
|
|
addAttributes(section, section, null, section.getAttribute('data-element-attributes') ||
|
|
section.parentNode.getAttribute('data-element-attributes') ||
|
|
DEFAULT_ELEMENT_ATTRIBUTES_SEPARATOR,
|
|
section.getAttribute('data-attributes') ||
|
|
section.parentNode.getAttribute('data-attributes') ||
|
|
DEFAULT_SLIDE_ATTRIBUTES_SEPARATOR)
|
|
|
|
// If there were notes, we need to re-add them after
|
|
// having overwritten the section's HTML
|
|
if (notes) {
|
|
section.appendChild(notes)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// API
|
|
return {
|
|
initialize: function () {
|
|
processSlides()
|
|
convertSlides()
|
|
},
|
|
// TODO: Do these belong in the API?
|
|
processSlides: processSlides,
|
|
convertSlides: convertSlides,
|
|
slidify: slidify
|
|
}
|
|
}))
|