1 files changed, 40 insertions, 0 deletions
diff --git a/devtools/client/shared/string-utils.js b/devtools/client/shared/string-utils.js
new file mode 100644
index 0000000000..327d3588c6
--- /dev/null
+++ b/devtools/client/shared/string-utils.js
@@ -0,0 +1,40 @@
+/* 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 {
+  LongStringFront,
+} = require("resource://devtools/client/fronts/string.js");
+
+/**
+ * Fetches the full text of a LongString.
+ *
+ * @param {DevToolsClient} client
+ * @param {object|string} stringGrip: A long string grip. If the param is a simple string,
+ *                                    it will be returned as is.
+ * @return {Promise<String>} The full string content.
+ */
+async function getLongStringFullText(client, stringGrip) {
+  if (typeof stringGrip !== "object" || stringGrip.type !== "longString") {
+    return stringGrip;
+  }
+
+  const { initial, length } = stringGrip;
+  const longStringFront = new LongStringFront(
+    client
+    // this.commands.targetCommand.targetFront
+  );
+  longStringFront.form(stringGrip);
+  // The front has to be managed to be able to call the actor method.
+  longStringFront.manage(longStringFront);
+
+  const response = await longStringFront.substring(initial.length, length);
+  const payload = initial + response;
+
+  longStringFront.destroy();
+
+  return payload;
+}
+
+exports.getLongStringFullText = getLongStringFullText;