1 files changed, 74 insertions, 0 deletions
diff --git a/js/src/shell/jsshell.cpp b/js/src/shell/jsshell.cpp
new file mode 100644
index 0000000000..7f8e53b9a4
--- /dev/null
+++ b/js/src/shell/jsshell.cpp
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+// jsshell.cpp - Utilities for the JS shell
+
+#include "shell/jsshell.h"
+
+#include "jsapi.h"
+#include "jsfriendapi.h"
+
+#include "vm/StringBuffer.h"
+
+using namespace JS;
+
+namespace js {
+namespace shell {
+
+bool
+GenerateInterfaceHelp(JSContext* cx, HandleObject obj, const char* name)
+{
+    AutoIdVector idv(cx);
+    if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY | JSITER_HIDDEN, &idv))
+        return false;
+
+    StringBuffer buf(cx);
+    if (!buf.append(' '))
+        return false;
+
+    for (size_t i = 0; i < idv.length(); i++) {
+        RootedValue v(cx);
+        RootedId id(cx, idv[i]);
+        if (!JS_GetPropertyById(cx, obj, id, &v))
+            return false;
+        if (!v.isObject())
+            continue;
+        bool hasHelp = false;
+        RootedObject prop(cx, &v.toObject());
+        if (!JS_GetProperty(cx, prop, "usage", &v))
+            return false;
+        if (v.isString())
+            hasHelp = true;
+        if (!JS_GetProperty(cx, prop, "help", &v))
+            return false;
+        if (v.isString())
+            hasHelp = true;
+        if (hasHelp) {
+            if (!buf.append(' ') ||
+                !buf.append(name, strlen(name)) ||
+                !buf.append('.') ||
+                !buf.append(JSID_TO_FLAT_STRING(id)))
+            {
+                return false;
+            }
+        }
+    }
+
+    RootedString s(cx, buf.finishString());
+    if (!s || !JS_DefineProperty(cx, obj, "help", s, 0))
+        return false;
+
+    if (!buf.append(name, strlen(name)) || !buf.append(" - interface object", 20))
+        return false;
+    s = buf.finishString();
+    if (!s || !JS_DefineProperty(cx, obj, "usage", s, 0))
+        return false;
+
+    return true;
+}
+
+} // namespace shell
+} // namespace js