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/*
* @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
*
* @author Julius Härtl <jus@bitgrid.net>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
import { Extension, Plugin } from 'tiptap'
import { Decoration, DecorationSet } from 'prosemirror-view'
const contrastRatio = (value) => {
const hexCode = value.charAt(0) === '#'
? value.substr(1, 6)
: value
const hexR = parseInt(hexCode.substr(0, 2), 16)
const hexG = parseInt(hexCode.substr(2, 2), 16)
const hexB = parseInt(hexCode.substr(4, 2), 16)
return (hexR + hexG + hexB) / (255 * 3)
}
function updateBlameMap(map, transform, id) {
const result = []; const mapping = transform.mapping
for (let i = 0; i < map.length; i++) {
const span = map[i]
const from = mapping.map(span.from, 1); const to = mapping.map(span.to, -1)
if (from < to) result.push(new Span(from, to, span.commit))
}
for (let i = 0; i < mapping.maps.length; i++) {
const map = mapping.maps[i]; const after = mapping.slice(i + 1)
map.forEach((_s, _e, start, end) => {
insertIntoBlameMap(result, after.map(start, 1), after.map(end, -1), id)
})
}
return result
}
function insertIntoBlameMap(map, from, to, commit) {
if (from >= to) {
return
}
let pos = 0
let next
for (; pos < map.length; pos++) {
next = map[pos]
if (next.commit === commit) {
if (next.to >= from) break
} else if (next.to > from) { // Different commit, not before
if (next.from < from) { // Sticks out to the left (loop below will handle right side)
const left = new Span(next.from, from, next.commit)
if (next.to > to) map.splice(pos++, 0, left)
else map[pos++] = left
}
break
}
}
// eslint-ignore
while ((next = map[pos])) {
if (next.commit === commit) {
if (next.from > to) break
from = Math.min(from, next.from)
to = Math.max(to, next.to)
map.splice(pos, 1)
} else {
if (next.from >= to) break
if (next.to > to) {
map[pos] = new Span(to, next.to, next.commit)
break
} else {
map.splice(pos, 1)
}
}
}
map.splice(pos, 0, new Span(from, to, commit))
}
class TrackState {
constructor(blameMap, commits, uncommittedSteps, uncommittedMaps) {
// The blame map is a data structure that lists a sequence of
// document ranges, along with the commit that inserted them. This
// can be used to, for example, highlight the part of the document
// that was inserted by a commit.
this.blameMap = blameMap
// The commit history, as an array of objects.
this.commits = commits
// Inverted steps and their maps corresponding to the changes that
// have been made since the last commit.
this.uncommittedSteps = uncommittedSteps
this.uncommittedMaps = uncommittedMaps
}
// Apply a transform to this state
applyTransform(transform) {
// Invert the steps in the transaction, to be able to save them in
// the next commit
const inverted
= transform.steps.map((step, i) => step.invert(transform.docs[i]))
const newBlame = updateBlameMap(this.blameMap, transform, this.commits.length)
// Create a new state—since these are part of the editor state, a
// persistent data structure, they must not be mutated.
return new TrackState(newBlame, this.commits,
this.uncommittedSteps.concat(inverted),
this.uncommittedMaps.concat(transform.mapping.maps))
}
// When a transaction is marked as a commit, this is used to put any
// uncommitted steps into a new commit.
applyCommit(message, time, author) {
if (this.uncommittedSteps.length === 0) return this
const commit = new Commit(message, time, this.uncommittedSteps, this.uncommittedMaps, author)
return new TrackState(this.blameMap, this.commits.concat(commit), [], [])
}
}
class Span {
constructor(from, to, commit) {
this.from = from; this.to = to; this.commit = commit
}
}
class Commit {
constructor(message, time, steps, maps, author) {
this.message = message
this.time = time
this.steps = steps
this.maps = maps
this.author = author
}
}
class UserColor extends Extension {
get name() {
return 'users'
}
get defaultOptions() {
return {
clientID: 0,
color: (clientID) => {
return '#' + Math.floor((Math.abs(Math.sin(clientID) * 16777215)) % 16777215).toString(16) + 'aa'
},
name: (clientID) => {
return null
},
}
}
get plugins() {
return [
new Plugin({
clientID: this.options.clientID,
color: this.options.color,
name: this.options.name,
state: {
init(_, instance) {
return {
tracked: new TrackState([new Span(0, instance.doc.content.size, null)], [], [], []),
deco: DecorationSet.empty,
}
},
apply(tr, instance, oldState, state) {
let { tracked, decos } = instance
let tState = this.getState(oldState).tracked
if (tr.docChanged) {
tracked = tracked.applyTransform(tr)
const clientID = tr.getMeta('clientID') ? tr.getMeta('clientID') : this.spec.clientID
tracked = tracked.applyCommit(clientID, new Date(tr.time), {
clientID,
color: this.spec.color(clientID),
name: this.spec.name(clientID),
})
tState = tracked
}
decos = tState.blameMap
.filter(span => typeof tState.commits[span.commit] !== 'undefined')
.map(span => {
const commit = tState.commits[span.commit]
return Decoration.inline(span.from, span.to, {
class: 'author-annotation',
style: 'background-color: ' + commit.author.color + '; color:' + (contrastRatio(commit.author.color) > 0.4 ? '#fff' : '#000'),
title: commit.author.name,
})
})
return { tracked, deco: DecorationSet.create(state.doc, decos) }
},
},
props: {
decorations(state) {
return this.getState(state).deco
},
},
}),
]
}
}
export default UserColor
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