1 files changed, 56 insertions, 0 deletions
diff --git a/tools/ts/build_nsresult.js b/tools/ts/build_nsresult.js
new file mode 100644
index 0000000000..6926d87bf2
--- /dev/null
+++ b/tools/ts/build_nsresult.js
@@ -0,0 +1,56 @@
+/* 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";
+
+/**
+ * Build: <objdir>/dist/@types/lib.gecko.nsresult.d.ts,
+ *
+ * from:  <srcdir>/js/xpconnect/src/xpc.msg and
+ *        <srcdir>/tools/ts/error_list.json,
+ *        generated manually for now.
+ */
+
+const fs = require("fs");
+const peggy = require("peggy");
+
+const HEADER = `/**
+ * NOTE: Do not modify this file by hand.
+ * Content was generated from xpc.msg and error_list.json.
+ */
+`;
+
+const XPC_MSG_GRAMMAR = `
+  File = Header @( Comment / Definition / NL )*
+  Header = '/*' (!'*/' .)* '*/' NL
+  Comment = '/*' @$(!'*/' !NL .)* '*/' NL
+  Definition = 'XPC_MSG_DEF(' @$[A-Z0-9_]+ [ ]* ', "' @$[^"]+ '")' NL
+  NL = @$[ ]* '\\n'
+`;
+
+function main(lib_dts, xpc_msg, errors_json) {
+  let parser = peggy.generate(XPC_MSG_GRAMMAR);
+
+  let messages = parser.parse(fs.readFileSync(xpc_msg, "utf8"));
+  let errors = JSON.parse(fs.readFileSync(errors_json, "utf8"));
+
+  let lines = messages.map(line => {
+    if (!Array.isArray(line)) {
+      return line ? `  // ${line.trim()}` : "";
+    }
+    let [name, msg] = line;
+    return `\n  /** ${msg} */\n  ${name}: 0x${errors[name].toString(16)};`;
+  });
+
+  let dts = [
+    HEADER,
+    "interface nsIXPCComponents_Results {",
+    lines.join("\n").replaceAll("\n\n\n", "\n\n"),
+    "}\n",
+  ].join("\n");
+
+  console.log(`[INFO] ${lib_dts} (${dts.length.toLocaleString()} bytes)`);
+  fs.writeFileSync(lib_dts, dts);
+}
+
+main(...process.argv.slice(2));