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/* 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/. */
//! Utilities to throw exceptions from Rust bindings.
use dom::bindings::codegen::PrototypeList::proto_id_to_name;
use dom::bindings::conversions::ToJSValConvertible;
use dom::bindings::global::GlobalRef;
use dom::domexception::{DOMErrorName, DOMException};
use js::error::{throw_range_error, throw_type_error};
use js::jsapi::JSAutoCompartment;
use js::jsapi::{JSContext, JSObject, RootedValue};
use js::jsapi::{JS_IsExceptionPending, JS_ReportPendingException, JS_SetPendingException};
use js::jsapi::{JS_RestoreFrameChain, JS_SaveFrameChain};
use js::jsval::UndefinedValue;
/// DOM exceptions that can be thrown by a native DOM method.
#[derive(Debug, Clone, HeapSizeOf)]
pub enum Error {
/// IndexSizeError DOMException
IndexSize,
/// NotFoundError DOMException
NotFound,
/// HierarchyRequestError DOMException
HierarchyRequest,
/// WrongDocumentError DOMException
WrongDocument,
/// InvalidCharacterError DOMException
InvalidCharacter,
/// NotSupportedError DOMException
NotSupported,
/// InUseAttributeError DOMException
InUseAttribute,
/// InvalidStateError DOMException
InvalidState,
/// SyntaxError DOMException
Syntax,
/// NamespaceError DOMException
Namespace,
/// InvalidAccessError DOMException
InvalidAccess,
/// SecurityError DOMException
Security,
/// NetworkError DOMException
Network,
/// AbortError DOMException
Abort,
/// TimeoutError DOMException
Timeout,
/// InvalidNodeTypeError DOMException
InvalidNodeType,
/// DataCloneError DOMException
DataClone,
/// NoModificationAllowedError DOMException
NoModificationAllowed,
/// QuotaExceededError DOMException
QuotaExceeded,
/// TypeMismatchError DOMException
TypeMismatch,
/// TypeError JavaScript Error
Type(String),
/// RangeError JavaScript Error
Range(String),
/// A JavaScript exception is already pending.
JSFailed,
}
/// The return type for IDL operations that can throw DOM exceptions.
pub type Fallible<T> = Result<T, Error>;
/// The return type for IDL operations that can throw DOM exceptions and
/// return `()`.
pub type ErrorResult = Fallible<()>;
/// Set a pending exception for the given `result` on `cx`.
pub unsafe fn throw_dom_exception(cx: *mut JSContext, global: GlobalRef, result: Error) {
let code = match result {
Error::IndexSize => DOMErrorName::IndexSizeError,
Error::NotFound => DOMErrorName::NotFoundError,
Error::HierarchyRequest => DOMErrorName::HierarchyRequestError,
Error::WrongDocument => DOMErrorName::WrongDocumentError,
Error::InvalidCharacter => DOMErrorName::InvalidCharacterError,
Error::NotSupported => DOMErrorName::NotSupportedError,
Error::InUseAttribute => DOMErrorName::InUseAttributeError,
Error::InvalidState => DOMErrorName::InvalidStateError,
Error::Syntax => DOMErrorName::SyntaxError,
Error::Namespace => DOMErrorName::NamespaceError,
Error::InvalidAccess => DOMErrorName::InvalidAccessError,
Error::Security => DOMErrorName::SecurityError,
Error::Network => DOMErrorName::NetworkError,
Error::Abort => DOMErrorName::AbortError,
Error::Timeout => DOMErrorName::TimeoutError,
Error::InvalidNodeType => DOMErrorName::InvalidNodeTypeError,
Error::DataClone => DOMErrorName::DataCloneError,
Error::NoModificationAllowed => DOMErrorName::NoModificationAllowedError,
Error::QuotaExceeded => DOMErrorName::QuotaExceededError,
Error::TypeMismatch => DOMErrorName::TypeMismatchError,
Error::Type(message) => {
assert!(!JS_IsExceptionPending(cx));
throw_type_error(cx, &message);
return;
},
Error::Range(message) => {
assert!(!JS_IsExceptionPending(cx));
throw_range_error(cx, &message);
return;
},
Error::JSFailed => {
assert!(JS_IsExceptionPending(cx));
return;
}
};
assert!(!JS_IsExceptionPending(cx));
let exception = DOMException::new(global, code);
let mut thrown = RootedValue::new(cx, UndefinedValue());
exception.to_jsval(cx, thrown.handle_mut());
JS_SetPendingException(cx, thrown.handle());
}
/// Report a pending exception, thereby clearing it.
pub fn report_pending_exception(cx: *mut JSContext, obj: *mut JSObject) {
unsafe {
if JS_IsExceptionPending(cx) {
let saved = JS_SaveFrameChain(cx);
{
let _ac = JSAutoCompartment::new(cx, obj);
JS_ReportPendingException(cx);
}
if saved {
JS_RestoreFrameChain(cx);
}
}
}
}
/// Throw an exception to signal that a `JSVal` can not be converted to any of
/// the types in an IDL union type.
pub unsafe fn throw_not_in_union(cx: *mut JSContext, names: &'static str) {
assert!(!JS_IsExceptionPending(cx));
let error = format!("argument could not be converted to any of: {}", names);
throw_type_error(cx, &error);
}
/// Throw an exception to signal that a `JSObject` can not be converted to a
/// given DOM type.
pub unsafe fn throw_invalid_this(cx: *mut JSContext, proto_id: u16) {
debug_assert!(!JS_IsExceptionPending(cx));
let error = format!("\"this\" object does not implement interface {}.",
proto_id_to_name(proto_id));
throw_type_error(cx, &error);
}
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