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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::bindings::js::Rootable;
use dom::domexception::{DOMException, DOMErrorName};
use util::str::DOMString;
use js::jsapi::{JSContext, JSObject};
use js::jsapi::{JS_IsExceptionPending, JS_SetPendingException, JS_ReportPendingException};
use js::jsapi::{JS_ReportErrorNumber, JSErrorFormatString, JSEXN_TYPEERR, JSEXN_RANGEERR};
use js::jsapi::{JS_SaveFrameChain, JS_RestoreFrameChain};
use js::rust::with_compartment;
use libc;
use std::ffi::CString;
use std::ptr;
/// DOM exceptions that can be thrown by a native DOM method.
#[derive(Debug, Clone)]
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,
/// TypeError JavaScript Error
Type(DOMString),
/// RangeError JavaScript Error
Range(DOMString),
/// 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 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::Type(message) => {
assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
throw_type_error(cx, &message);
return;
},
Error::Range(message) => {
assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
throw_range_error(cx, &message);
return;
},
Error::JSFailed => {
assert!(unsafe { JS_IsExceptionPending(cx) } == 1);
return;
}
};
assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
let exception = DOMException::new(global, code).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) {
assert!(unsafe { JS_IsExceptionPending(cx) } == 0);
let error = format!("argument could not be converted to any of: {}", names);
throw_type_error(cx, &error);
}
/// Format string used to throw javascript errors.
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 mut TYPE_ERROR_FORMAT_STRING: JSErrorFormatString = JSErrorFormatString {
format: &ERROR_FORMAT_STRING_STRING as *const libc::c_char,
argCount: 1,
exnType: JSEXN_TYPEERR as i16,
};
/// Format string struct used to throw `RangeError`s.
static mut RANGE_ERROR_FORMAT_STRING: JSErrorFormatString = JSErrorFormatString {
format: &ERROR_FORMAT_STRING_STRING as *const libc::c_char,
argCount: 1,
exnType: JSEXN_RANGEERR as i16,
};
/// Callback used to throw javascript errors.
/// See throw_js_error for info about error_number.
unsafe extern fn get_error_message(_user_ref: *mut libc::c_void,
_locale: *const libc::c_char,
error_number: libc::c_uint) -> *const JSErrorFormatString
{
match error_number as i32 {
JSEXN_TYPEERR => &TYPE_ERROR_FORMAT_STRING as *const JSErrorFormatString,
JSEXN_RANGEERR => &RANGE_ERROR_FORMAT_STRING as *const JSErrorFormatString,
_ => panic!("Bad js error number given to get_error_message: {}", error_number)
}
}
/// Helper fn to throw a javascript error with the given message and number.
/// Reuse the jsapi error codes to distinguish the error_number
/// passed back to the get_error_message callback.
/// c_uint is u32, so this cast is safe, as is casting to/from i32 from there.
fn throw_js_error(cx: *mut JSContext, error: &str, error_number: u32) {
let error = CString::new(error).unwrap();
unsafe {
JS_ReportErrorNumber(cx,
Some(get_error_message as
unsafe extern "C" fn(*mut libc::c_void, *const libc::c_char,
libc::c_uint) -> *const JSErrorFormatString),
ptr::null_mut(), error_number, error.as_ptr());
}
}
/// Throw a `TypeError` with the given message.
pub fn throw_type_error(cx: *mut JSContext, error: &str) {
throw_js_error(cx, error, JSEXN_TYPEERR as u32);
}
/// Throw a `RangeError` with the given message.
pub fn throw_range_error(cx: *mut JSContext, error: &str) {
throw_js_error(cx, error, JSEXN_RANGEERR as u32);
}
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