1 files changed, 47 insertions, 0 deletions
diff --git a/devtools/shared/fronts/string.js b/devtools/shared/fronts/string.js
new file mode 100644
index 000000000..12036afe4
--- /dev/null
+++ b/devtools/shared/fronts/string.js
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const {DebuggerServer} = require("devtools/server/main");
+const promise = require("promise");
+const {longStringSpec, SimpleStringFront} = require("devtools/shared/specs/string");
+const protocol = require("devtools/shared/protocol");
+
+const LongStringFront = protocol.FrontClassWithSpec(longStringSpec, {
+  initialize: function (client) {
+    protocol.Front.prototype.initialize.call(this, client);
+  },
+
+  destroy: function () {
+    this.initial = null;
+    this.length = null;
+    this.strPromise = null;
+    protocol.Front.prototype.destroy.call(this);
+  },
+
+  form: function (form) {
+    this.actorID = form.actor;
+    this.initial = form.initial;
+    this.length = form.length;
+  },
+
+  string: function () {
+    if (!this.strPromise) {
+      let promiseRest = (thusFar) => {
+        if (thusFar.length === this.length) {
+          return promise.resolve(thusFar);
+        }
+        return this.substring(thusFar.length,
+                              thusFar.length + DebuggerServer.LONG_STRING_READ_LENGTH)
+          .then((next) => promiseRest(thusFar + next));
+      };
+
+      this.strPromise = promiseRest(this.initial);
+    }
+    return this.strPromise;
+  }
+});
+
+exports.LongStringFront = LongStringFront;
+exports.SimpleStringFront = SimpleStringFront;