1 files changed, 69 insertions, 0 deletions
diff --git a/toolkit/components/promiseworker/worker/GeneratePromiseWorkerScript.py b/toolkit/components/promiseworker/worker/GeneratePromiseWorkerScript.py
new file mode 100644
index 0000000000..49ffe4aa05
--- /dev/null
+++ b/toolkit/components/promiseworker/worker/GeneratePromiseWorkerScript.py
@@ -0,0 +1,69 @@
+# 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/.
+
+import re
+
+begin_script_only_re = re.compile("^// #BEGIN_SCRIPT_ONLY")
+end_script_only_re = re.compile("^// #END_SCRIPT_ONLY")
+export_re = re.compile("^// #EXPORT (.+)")
+
+
+def process_file(template_js, kind):
+    lines = []
+    is_script_only = False
+    exports = []
+
+    with open(template_js, "r") as f:
+        for line in f:
+            if kind == "module":
+                if is_script_only:
+                    m = end_script_only_re.match(line)
+                    if m:
+                        is_script_only = False
+
+                    # NOTE: Put an empty line to keep the line number same.
+                    lines.append("\n")
+                    continue
+                else:
+                    m = begin_script_only_re.match(line)
+                    if m:
+                        is_script_only = True
+                        lines.append("\n")
+                        continue
+            else:
+                m = end_script_only_re.match(line)
+                if m:
+                    lines.append("\n")
+                    continue
+
+                m = begin_script_only_re.match(line)
+                if m:
+                    lines.append("\n")
+                    continue
+
+            m = export_re.match(line)
+            if m:
+                name = m.group(1)
+
+                if kind == "script":
+                    lines.append(f"exports.{name} = {name};\n")
+                else:
+                    exports.append(name)
+                    lines.append("\n")
+                continue
+
+            lines.append(line)
+
+    if kind == "module":
+        lines.append("export const PromiseWorker = { " + ", ".join(exports) + " };\n")
+
+    return "".join(lines)
+
+
+def generate_script(output, template_js):
+    output.write(process_file(template_js, "script"))
+
+
+def generate_module(output, template_js):
+    output.write(process_file(template_js, "module"))