HackMD/public/vendor/ot/editor-client.js

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JavaScript
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/*global ot */
ot.EditorClient = (function () {
'use strict';
var Client = ot.Client;
var Selection = ot.Selection;
var UndoManager = ot.UndoManager;
var TextOperation = ot.TextOperation;
var WrappedOperation = ot.WrappedOperation;
function SelfMeta (selectionBefore, selectionAfter) {
this.selectionBefore = selectionBefore;
this.selectionAfter = selectionAfter;
}
SelfMeta.prototype.invert = function () {
return new SelfMeta(this.selectionAfter, this.selectionBefore);
};
SelfMeta.prototype.compose = function (other) {
return new SelfMeta(this.selectionBefore, other.selectionAfter);
};
SelfMeta.prototype.transform = function (operation) {
return new SelfMeta(
(this.selectionBefore ? this.selectionBefore.transform(operation) : null),
(this.selectionAfter ? this.selectionAfter.transform(operation) : null)
);
};
function OtherMeta (clientId, selection) {
this.clientId = clientId;
this.selection = selection;
}
OtherMeta.fromJSON = function (obj) {
return new OtherMeta(
obj.clientId,
obj.selection && Selection.fromJSON(obj.selection)
);
};
OtherMeta.prototype.transform = function (operation) {
return new OtherMeta(
this.clientId,
this.selection && this.selection.transform(operation)
);
};
function OtherClient (id, listEl, editorAdapter, name, color, selection) {
this.id = id;
this.listEl = listEl;
this.editorAdapter = editorAdapter;
this.name = name;
this.color = color;
this.li = document.createElement('li');
if (name) {
this.li.textContent = name;
this.listEl.appendChild(this.li);
}
if(!color)
this.setColor(name ? hueFromName(name) : Math.random());
else
this.setForceColor(color);
if (selection) { this.updateSelection(selection); }
}
OtherClient.prototype.setColor = function (hue) {
this.hue = hue;
this.color = hsl2hex(hue, 0.75, 0.5);
this.lightColor = hsl2hex(hue, 0.5, 0.9);
if (this.li) { this.li.style.color = this.color; }
};
OtherClient.prototype.setForceColor = function (color) {
this.hue = null;
this.color = color;
this.lightColor = color;
if (this.li) { this.li.style.color = this.color; }
};
OtherClient.prototype.setName = function (name) {
if (this.name === name) { return; }
this.name = name;
this.li.textContent = name;
if (!this.li.parentNode) {
this.listEl.appendChild(this.li);
}
this.setColor(hueFromName(name));
};
OtherClient.prototype.updateSelection = function (selection) {
this.removeSelection();
this.selection = selection;
this.mark = this.editorAdapter.setOtherSelection(
selection,
selection.position === selection.selectionEnd ? this.color : this.lightColor,
this.id
);
};
OtherClient.prototype.remove = function () {
if (this.li) { removeElement(this.li); }
this.removeSelection();
};
OtherClient.prototype.removeSelection = function () {
if (this.mark) {
this.mark.clear();
this.mark = null;
}
};
function EditorClient (revision, clients, serverAdapter, editorAdapter) {
Client.call(this, revision);
this.serverAdapter = serverAdapter;
this.editorAdapter = editorAdapter;
this.undoManager = new UndoManager();
this.initializeClientList();
this.initializeClients(clients);
var self = this;
this.editorAdapter.registerCallbacks({
change: function (operation, inverse) { self.onChange(operation, inverse); },
selectionChange: function () { self.onSelectionChange(); },
blur: function () { self.onBlur(); }
});
this.editorAdapter.registerUndo(function () { self.undo(); });
this.editorAdapter.registerRedo(function () { self.redo(); });
this.serverAdapter.registerCallbacks({
client_left: function (clientId) { self.onClientLeft(clientId); },
set_name: function (clientId, name) { self.getClientObject(clientId).setName(name); },
set_color: function (clientId, color) { self.getClientObject(clientId).setForceColor(color); },
ack: function (revision) { self.serverAck(revision); },
operation: function (revision, operation) {
self.applyServer(revision, TextOperation.fromJSON(operation));
},
operations: function (head, operations) {
self.applyOperations(head, operations);
},
selection: function (clientId, selection) {
if (selection) {
self.getClientObject(clientId).updateSelection(
self.transformSelection(Selection.fromJSON(selection))
);
} else {
self.getClientObject(clientId).removeSelection();
}
},
clients: function (clients) {
var clientId;
for (clientId in self.clients) {
if (self.clients.hasOwnProperty(clientId) && !clients.hasOwnProperty(clientId)) {
self.onClientLeft(clientId);
}
}
for (clientId in clients) {
if (clients.hasOwnProperty(clientId)) {
var clientObject = self.getClientObject(clientId);
if (clients[clientId].name) {
clientObject.setName(clients[clientId].name);
}
var selection = clients[clientId].selection;
if (selection) {
self.clients[clientId].updateSelection(
self.transformSelection(Selection.fromJSON(selection))
);
} else {
self.clients[clientId].removeSelection();
}
}
}
},
reconnect: function () { self.serverReconnect(); }
});
}
inherit(EditorClient, Client);
EditorClient.prototype.addClient = function (clientId, clientObj) {
this.clients[clientId] = new OtherClient(
clientId,
this.clientListEl,
this.editorAdapter,
clientObj.name || clientId,
clientObj.color || null,
clientObj.selection ? Selection.fromJSON(clientObj.selection) : null
);
};
EditorClient.prototype.initializeClients = function (clients) {
this.clients = {};
for (var clientId in clients) {
if (clients.hasOwnProperty(clientId)) {
this.addClient(clientId, clients[clientId]);
}
}
};
EditorClient.prototype.getClientObject = function (clientId) {
var client = this.clients[clientId];
if (client) { return client; }
return this.clients[clientId] = new OtherClient(
clientId,
this.clientListEl,
this.editorAdapter
);
};
EditorClient.prototype.onClientLeft = function (clientId) {
//console.log("User disconnected: " + clientId);
var client = this.clients[clientId];
if (!client) { return; }
client.remove();
delete this.clients[clientId];
};
EditorClient.prototype.initializeClientList = function () {
this.clientListEl = document.createElement('ul');
};
EditorClient.prototype.applyUnredo = function (operation) {
this.undoManager.add(operation.invert(this.editorAdapter.getValue()));
this.editorAdapter.applyOperation(operation.wrapped);
this.selection = operation.meta.selectionAfter;
this.editorAdapter.setSelection(this.selection);
this.applyClient(operation.wrapped);
};
EditorClient.prototype.undo = function () {
var self = this;
if (!this.undoManager.canUndo()) { return; }
this.undoManager.performUndo(function (o) { self.applyUnredo(o); });
};
EditorClient.prototype.redo = function () {
var self = this;
if (!this.undoManager.canRedo()) { return; }
this.undoManager.performRedo(function (o) { self.applyUnredo(o); });
};
EditorClient.prototype.onChange = function (textOperation, inverse) {
var selectionBefore = this.selection;
this.updateSelection();
var meta = new SelfMeta(selectionBefore, this.selection);
var operation = new WrappedOperation(textOperation, meta);
var compose = this.undoManager.undoStack.length > 0 &&
inverse.shouldBeComposedWithInverted(last(this.undoManager.undoStack).wrapped);
var inverseMeta = new SelfMeta(this.selection, selectionBefore);
this.undoManager.add(new WrappedOperation(inverse, inverseMeta), compose);
this.applyClient(textOperation);
};
EditorClient.prototype.updateSelection = function () {
this.selection = this.editorAdapter.getSelection();
};
EditorClient.prototype.onSelectionChange = function () {
var oldSelection = this.selection;
this.updateSelection();
if (oldSelection && this.selection.equals(oldSelection)) { return; }
this.sendSelection(this.selection);
};
EditorClient.prototype.onBlur = function () {
this.selection = null;
this.sendSelection(null);
};
EditorClient.prototype.sendSelection = function (selection) {
if (this.state instanceof Client.AwaitingWithBuffer) { return; }
this.serverAdapter.sendSelection(selection);
};
EditorClient.prototype.sendOperation = function (revision, operation) {
this.serverAdapter.sendOperation(revision, operation.toJSON(), this.selection);
};
EditorClient.prototype.getOperations = function (base, head) {
this.serverAdapter.getOperations(base, head);
};
EditorClient.prototype.applyOperation = function (operation) {
this.editorAdapter.applyOperation(operation);
this.updateSelection();
this.undoManager.transform(new WrappedOperation(operation, null));
};
function rgb2hex (r, g, b) {
function digits (n) {
var m = Math.round(255*n).toString(16);
return m.length === 1 ? '0'+m : m;
}
return '#' + digits(r) + digits(g) + digits(b);
}
function hsl2hex (h, s, l) {
if (s === 0) { return rgb2hex(l, l, l); }
var var2 = l < 0.5 ? l * (1+s) : (l+s) - (s*l);
var var1 = 2 * l - var2;
var hue2rgb = function (hue) {
if (hue < 0) { hue += 1; }
if (hue > 1) { hue -= 1; }
if (6*hue < 1) { return var1 + (var2-var1)*6*hue; }
if (2*hue < 1) { return var2; }
if (3*hue < 2) { return var1 + (var2-var1)*6*(2/3 - hue); }
return var1;
};
return rgb2hex(hue2rgb(h+1/3), hue2rgb(h), hue2rgb(h-1/3));
}
function hueFromName (name) {
var a = 1;
for (var i = 0; i < name.length; i++) {
a = 17 * (a+name.charCodeAt(i)) % 360;
}
return a/360;
}
// Set Const.prototype.__proto__ to Super.prototype
function inherit (Const, Super) {
function F () {}
F.prototype = Super.prototype;
Const.prototype = new F();
Const.prototype.constructor = Const;
}
function last (arr) { return arr[arr.length - 1]; }
// Remove an element from the DOM.
function removeElement (el) {
if (el.parentNode) {
el.parentNode.removeChild(el);
}
}
return EditorClient;
}());