Refactored out TextPatcher and JsonOT and replaced with new ChainPad

www/common/text-cursor.js

@@ -0,0 +1,25 @@
+define([
+], function () {
+    var module = { exports: {} };
+    var transformCursor = function (cursor, op) {
+        if (!op) { return cursor; }
+        var pos = op.offset;
+        var remove = op.toRemove;
+        var insert = op.toInsert.length;
+        if (typeof cursor === 'undefined') { return; }
+        if (typeof remove === 'number' && pos < cursor) {
+            cursor -= Math.min(remove, cursor - pos);
+        }
+        if (typeof insert === 'number' && pos < cursor) {
+            cursor += insert;
+        }
+        return cursor;
+    };
+    module.exports.transformCursor = function (cursor, ops) {
+        if (Array.isArray(ops)) {
+            for (var i = ops.length - 1; i >= 0; i--) { transformCursor(cursor, ops[i]); }
+            return;
+        }
+        transformCursor(ops);
+    };
+});