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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::conversions::ToJSValConvertible;
use dom::bindings::global::GlobalRef;
use dom::domexception::DOMException;
use js::jsapi::{JSContext, JSBool, JSObject};
use js::jsapi::{JS_IsExceptionPending, JS_SetPendingException, JS_ReportPendingException};
use js::jsapi::{JS_ReportErrorNumber, JSErrorFormatString, JSEXN_TYPEERR};
use js::jsapi::{JS_SaveFrameChain, JS_RestoreFrameChain};
use js::glue::{ReportError};
use js::rust::with_compartment;
use libc;
use std::ptr;
/// DOM exceptions that can be thrown by a native DOM method.
#[deriving(Show)]
pub enum Error {
IndexSize,
FailureUnknown,
NotFound,
HierarchyRequest,
InvalidCharacter,
NotSupported,
InvalidState,
Syntax,
NamespaceError,
InvalidAccess,
Security,
Network,
Abort,
Timeout
}
/// 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 DOM exception for the given `result` on `cx`.
pub fn throw_dom_exception(cx: *mut JSContext, global: &GlobalRef,
result: Error) {
assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
let exception = DOMException::new_from_error(global, result).root();
let thrown = exception.to_jsval(cx);
unsafe {
JS_SetPendingException(cx, thrown);
}
}
/// Report a pending exception, thereby clearing it.
pub fn report_pending_exception(cx: *mut JSContext, obj: *mut JSObject) {
unsafe {
if JS_IsExceptionPending(cx) != 0 {
let saved = JS_SaveFrameChain(cx);
with_compartment(cx, obj, || {
JS_ReportPendingException(cx);
});
if saved != 0 {
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 fn throw_not_in_union(cx: *mut 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;
}
/// Format string used to throw `TypeError`s.
static ERROR_FORMAT_STRING_STRING: [libc::c_char, ..4] = [
'{' as libc::c_char,
'0' as libc::c_char,
'}' as libc::c_char,
0 as libc::c_char,
];
/// Format string struct used to throw `TypeError`s.
static ERROR_FORMAT_STRING: JSErrorFormatString = JSErrorFormatString {
format: &ERROR_FORMAT_STRING_STRING as *const libc::c_char,
argCount: 1,
exnType: JSEXN_TYPEERR as i16,
};
/// Callback used to throw `TypeError`s.
extern fn get_error_message(_user_ref: *mut libc::c_void,
_locale: *const libc::c_char,
error_number: libc::c_uint) -> *const JSErrorFormatString
{
assert_eq!(error_number, 0);
&ERROR_FORMAT_STRING as *const JSErrorFormatString
}
/// Throw a `TypeError` with the given message.
pub fn throw_type_error(cx: *mut JSContext, error: &str) {
let error = error.to_c_str();
unsafe {
JS_ReportErrorNumber(cx, Some(get_error_message), ptr::mut_null(), 0, error.as_ptr());
}
}
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