auto merge of #1773 : sawrubh/servo/issue1749, r=Ms2ger

1 files changed, 45 insertions, 0 deletions

diff --git a/src/components/script/dom/bindings/error.rs b/src/components/script/dom/bindings/error.rs
new file mode 100644
index 00000000000..8ea949b28f6
--- /dev/null
+++ b/src/components/script/dom/bindings/error.rs
@@ -0,0 +1,45 @@
+/* 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 js::jsapi::{JSContext, JSBool};
+use js::jsapi::{JS_IsExceptionPending};
+
+use js::glue::{ReportError};
+
+#[deriving(ToStr)]
+pub enum Error {
+    FailureUnknown,
+    NotFound,
+    HierarchyRequest,
+    InvalidCharacter,
+    NotSupported,
+    InvalidState,
+    NamespaceError
+}
+
+pub type Fallible<T> = Result<T, Error>;
+
+pub type ErrorResult = Fallible<()>;
+
+pub fn throw_method_failed_with_details<T>(cx: *JSContext,
+                                           result: Result<T, Error>,
+                                           interface: &'static str,
+                                           member: &'static str) -> JSBool {
+    assert!(result.is_err());
+    assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
+    let message = format!("Method failed: {}.{}", interface, member);
+    message.with_c_str(|string| {
+        unsafe { ReportError(cx, string) };
+    });
+    return 0;
+}
+
+pub fn throw_not_in_union(cx: *JSContext, names: &'static str) -> JSBool {
+    assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
+    let message = format!("argument could not be converted to any of: {}", names);
+    message.with_c_str(|string| {
+        unsafe { ReportError(cx, string) };
+    });
+    return 0;
+}