From 556338a9c6964d110c1351a402b425c71c2571fa Mon Sep 17 00:00:00 2001
From: Wu Cheng-Han
Date: Sat, 11 Jul 2015 12:43:08 +0800
Subject: Added support of operational transformation

---
 public/vendor/ot/ajax-adapter.js | 116 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100755 public/vendor/ot/ajax-adapter.js

(limited to 'public/vendor/ot/ajax-adapter.js')

diff --git a/public/vendor/ot/ajax-adapter.js b/public/vendor/ot/ajax-adapter.js
new file mode 100755
index 00000000..51ea9eab
--- /dev/null
+++ b/public/vendor/ot/ajax-adapter.js
@@ -0,0 +1,116 @@
+/*global ot, $ */
+
+ot.AjaxAdapter = (function () {
+  'use strict';
+
+  function AjaxAdapter (path, ownUserName, revision) {
+    if (path[path.length - 1] !== '/') { path += '/'; }
+    this.path = path;
+    this.ownUserName = ownUserName;
+    this.majorRevision = revision.major || 0;
+    this.minorRevision = revision.minor || 0;
+    this.poll();
+  }
+
+  AjaxAdapter.prototype.renderRevisionPath = function () {
+    return 'revision/' + this.majorRevision + '-' + this.minorRevision;
+  };
+
+  AjaxAdapter.prototype.handleResponse = function (data) {
+    var i;
+    var operations = data.operations;
+    for (i = 0; i < operations.length; i++) {
+      if (operations[i].user === this.ownUserName) {
+        this.trigger('ack');
+      } else {
+        this.trigger('operation', operations[i].operation);
+      }
+    }
+    if (operations.length > 0) {
+      this.majorRevision += operations.length;
+      this.minorRevision = 0;
+    }
+
+    var events = data.events;
+    if (events) {
+      for (i = 0; i < events.length; i++) {
+        var user = events[i].user;
+        if (user === this.ownUserName) { continue; }
+        switch (events[i].event) {
+          case 'joined':    this.trigger('set_name', user, user); break;
+          case 'left':      this.trigger('client_left', user); break;
+          case 'selection': this.trigger('selection', user, events[i].selection); break;
+        }
+      }
+      this.minorRevision += events.length;
+    }
+
+    var users = data.users;
+    if (users) {
+      delete users[this.ownUserName];
+      this.trigger('clients', users);
+    }
+
+    if (data.revision) {
+      this.majorRevision = data.revision.major;
+      this.minorRevision = data.revision.minor;
+    }
+  };
+
+  AjaxAdapter.prototype.poll = function () {
+    var self = this;
+    $.ajax({
+      url: this.path + this.renderRevisionPath(),
+      type: 'GET',
+      dataType: 'json',
+      timeout: 5000,
+      success: function (data) {
+        self.handleResponse(data);
+        self.poll();
+      },
+      error: function () {
+        setTimeout(function () { self.poll(); }, 500);
+      }
+    });
+  };
+
+  AjaxAdapter.prototype.sendOperation = function (revision, operation, selection) {
+    if (revision !== this.majorRevision) { throw new Error("Revision numbers out of sync"); }
+    var self = this;
+    $.ajax({
+      url: this.path + this.renderRevisionPath(),
+      type: 'POST',
+      data: JSON.stringify({ operation: operation, selection: selection }),
+      contentType: 'application/json',
+      processData: false,
+      success: function (data) {},
+      error: function () {
+        setTimeout(function () { self.sendOperation(revision, operation, selection); }, 500);
+      }
+    });
+  };
+
+  AjaxAdapter.prototype.sendSelection = function (obj) {
+    $.ajax({
+      url: this.path + this.renderRevisionPath() + '/selection',
+      type: 'POST',
+      data: JSON.stringify(obj),
+      contentType: 'application/json',
+      processData: false,
+      timeout: 1000
+    });
+  };
+
+  AjaxAdapter.prototype.registerCallbacks = function (cb) {
+    this.callbacks = cb;
+  };
+
+  AjaxAdapter.prototype.trigger = function (event) {
+    var args = Array.prototype.slice.call(arguments, 1);
+    var action = this.callbacks && this.callbacks[event];
+    if (action) { action.apply(this, args); }
+  };
+
+  return AjaxAdapter;
+
+})();
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