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use std::{char, ffi, ptr, slice};
use js::conversions::latin1_to_string;
pub use js::conversions::{
ConversionBehavior, ConversionResult, FromJSValConvertible, ToJSValConvertible,
};
use js::error::throw_type_error;
use js::glue::{GetProxyReservedSlot, IsWrapper, JS_GetReservedSlot, UnwrapObjectDynamic};
use js::jsapi::{
Heap, IsWindowProxy, JSContext, JSObject, JSString, JS_DeprecatedStringHasLatin1Chars,
JS_GetLatin1StringCharsAndLength, JS_GetTwoByteStringCharsAndLength, JS_IsExceptionPending,
JS_NewStringCopyN,
};
use js::jsval::{ObjectValue, StringValue, UndefinedValue};
use js::rust::wrappers::{IsArrayObject, JS_GetProperty, JS_HasProperty};
use js::rust::{
get_object_class, is_dom_class, is_dom_object, maybe_wrap_value, HandleId, HandleObject,
HandleValue, MutableHandleValue, ToString,
};
use num_traits::Float;
use servo_config::opts;
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::num::Finite;
use crate::dom::bindings::reflector::{DomObject, Reflector};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::{ByteString, DOMString, USVString};
use crate::dom::bindings::trace::{JSTraceable, RootedTraceableBox};
use crate::dom::bindings::utils::DOMClass;
use crate::dom::filelist::FileList;
use crate::dom::htmlcollection::HTMLCollection;
use crate::dom::htmlformcontrolscollection::HTMLFormControlsCollection;
use crate::dom::htmloptionscollection::HTMLOptionsCollection;
use crate::dom::nodelist::NodeList;
use crate::dom::windowproxy::WindowProxy;
pub trait IDLInterface {
fn derives(_: &'static DOMClass) -> bool;
}
pub trait DerivedFrom<T: Castable>: Castable {}
impl<T: Float + ToJSValConvertible> ToJSValConvertible for Finite<T> {
#[inline]
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
let value = **self;
value.to_jsval(cx, rval);
}
}
impl<T: Float + FromJSValConvertible<Config = ()>> FromJSValConvertible for Finite<T> {
type Config = ();
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
option: (),
) -> Result<ConversionResult<Finite<T>>, ()> {
let result = match FromJSValConvertible::from_jsval(cx, value, option)? {
ConversionResult::Success(v) => v,
ConversionResult::Failure(error) => {
throw_type_error(cx, &error);
return Err(());
},
};
match Finite::new(result) {
Some(v) => Ok(ConversionResult::Success(v)),
None => {
throw_type_error(cx, "this argument is not a finite floating-point value");
Err(())
},
}
}
}
impl<T: DomObject + IDLInterface> FromJSValConvertible for DomRoot<T> {
type Config = ();
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
_config: Self::Config,
) -> Result<ConversionResult<DomRoot<T>>, ()> {
Ok(match root_from_handlevalue(value, cx) {
Ok(result) => ConversionResult::Success(result),
Err(()) => ConversionResult::Failure("value is not an object".into()),
})
}
}
impl<T: ToJSValConvertible + JSTraceable> ToJSValConvertible for RootedTraceableBox<T> {
#[inline]
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
let value = &**self;
value.to_jsval(cx, rval);
}
}
impl<T> FromJSValConvertible for RootedTraceableBox<Heap<T>>
where
T: FromJSValConvertible + js::rust::GCMethods + Copy,
Heap<T>: JSTraceable + Default,
{
type Config = T::Config;
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
config: Self::Config,
) -> Result<ConversionResult<Self>, ()> {
T::from_jsval(cx, value, config).map(|result| match result {
ConversionResult::Success(inner) => {
ConversionResult::Success(RootedTraceableBox::from_box(Heap::boxed(inner)))
},
ConversionResult::Failure(msg) => ConversionResult::Failure(msg),
})
}
}
pub unsafe fn jsid_to_string(cx: *mut JSContext, id: HandleId) -> Option<DOMString> {
let id_raw = *id;
if id_raw.is_string() {
return Some(jsstring_to_str(cx, id_raw.to_string()));
}
if id_raw.is_int() {
return Some(id_raw.to_int().to_string().into());
}
None
}
impl ToJSValConvertible for USVString {
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
self.0.to_jsval(cx, rval);
}
}
#[derive(Clone, PartialEq)]
pub enum StringificationBehavior {
Default,
Empty,
}
impl ToJSValConvertible for DOMString {
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
(**self).to_jsval(cx, rval);
}
}
impl FromJSValConvertible for DOMString {
type Config = StringificationBehavior;
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
null_behavior: StringificationBehavior,
) -> Result<ConversionResult<DOMString>, ()> {
if null_behavior == StringificationBehavior::Empty && value.get().is_null() {
Ok(ConversionResult::Success(DOMString::new()))
} else {
let jsstr = ToString(cx, value);
if jsstr.is_null() {
debug!("ToString failed");
Err(())
} else {
Ok(ConversionResult::Success(jsstring_to_str(cx, jsstr)))
}
}
}
}
pub unsafe fn jsstring_to_str(cx: *mut JSContext, s: *mut JSString) -> DOMString {
let latin1 = JS_DeprecatedStringHasLatin1Chars(s);
DOMString::from_string(if latin1 {
latin1_to_string(cx, s)
} else {
let mut length = 0;
let chars = JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), s, &mut length);
assert!(!chars.is_null());
let potentially_ill_formed_utf16 = slice::from_raw_parts(chars, length as usize);
let mut s = String::with_capacity(length as usize);
for item in char::decode_utf16(potentially_ill_formed_utf16.iter().cloned()) {
match item {
Ok(c) => s.push(c),
Err(_) => {
macro_rules! message {
() => {
"Found an unpaired surrogate in a DOM string. \
If you see this in real web content, \
please comment on https://github.com/servo/servo/issues/6564"
};
}
if opts::get().debug.replace_surrogates {
error!(message!());
s.push('\u{FFFD}');
} else {
panic!(concat!(
message!(),
" Use `-Z replace-surrogates` \
on the command line to make this non-fatal."
));
}
},
}
}
s
})
}
impl FromJSValConvertible for USVString {
type Config = ();
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
_: (),
) -> Result<ConversionResult<USVString>, ()> {
let jsstr = ToString(cx, value);
if jsstr.is_null() {
debug!("ToString failed");
return Err(());
}
let latin1 = JS_DeprecatedStringHasLatin1Chars(jsstr);
if latin1 {
return Ok(ConversionResult::Success(USVString(String::from(
jsstring_to_str(cx, jsstr),
))));
}
let mut length = 0;
let chars = JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), jsstr, &mut length);
assert!(!chars.is_null());
let char_vec = slice::from_raw_parts(chars as *const u16, length as usize);
Ok(ConversionResult::Success(USVString(
String::from_utf16_lossy(char_vec),
)))
}
}
impl ToJSValConvertible for ByteString {
unsafe fn to_jsval(&self, cx: *mut JSContext, mut rval: MutableHandleValue) {
let jsstr = JS_NewStringCopyN(
cx,
self.as_ptr() as *const libc::c_char,
self.len() as libc::size_t,
);
if jsstr.is_null() {
panic!("JS_NewStringCopyN failed");
}
rval.set(StringValue(&*jsstr));
}
}
impl FromJSValConvertible for ByteString {
type Config = ();
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
_option: (),
) -> Result<ConversionResult<ByteString>, ()> {
let string = ToString(cx, value);
if string.is_null() {
debug!("ToString failed");
return Err(());
}
let latin1 = JS_DeprecatedStringHasLatin1Chars(string);
if latin1 {
let mut length = 0;
let chars = JS_GetLatin1StringCharsAndLength(cx, ptr::null(), string, &mut length);
assert!(!chars.is_null());
let char_slice = slice::from_raw_parts(chars as *mut u8, length as usize);
return Ok(ConversionResult::Success(ByteString::new(
char_slice.to_vec(),
)));
}
let mut length = 0;
let chars = JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), string, &mut length);
let char_vec = slice::from_raw_parts(chars, length as usize);
if char_vec.iter().any(|&c| c > 0xFF) {
throw_type_error(cx, "Invalid ByteString");
Err(())
} else {
Ok(ConversionResult::Success(ByteString::new(
char_vec.iter().map(|&c| c as u8).collect(),
)))
}
}
}
impl ToJSValConvertible for Reflector {
unsafe fn to_jsval(&self, cx: *mut JSContext, mut rval: MutableHandleValue) {
let obj = self.get_jsobject().get();
assert!(!obj.is_null());
rval.set(ObjectValue(obj));
maybe_wrap_value(cx, rval);
}
}
pub fn is_dom_proxy(obj: *mut JSObject) -> bool {
use js::glue::IsProxyHandlerFamily;
unsafe {
let clasp = get_object_class(obj);
((*clasp).flags & js::JSCLASS_IS_PROXY) != 0 && IsProxyHandlerFamily(obj)
}
}
pub const DOM_OBJECT_SLOT: u32 = 0;
pub unsafe fn private_from_object(obj: *mut JSObject) -> *const libc::c_void {
let mut value = UndefinedValue();
if is_dom_object(obj) {
JS_GetReservedSlot(obj, DOM_OBJECT_SLOT, &mut value);
} else {
debug_assert!(is_dom_proxy(obj));
GetProxyReservedSlot(obj, 0, &mut value);
};
if value.is_undefined() {
ptr::null()
} else {
value.to_private()
}
}
pub unsafe fn get_dom_class(obj: *mut JSObject) -> Result<&'static DOMClass, ()> {
use js::glue::GetProxyHandlerExtra;
use crate::dom::bindings::utils::DOMJSClass;
let clasp = get_object_class(obj);
if is_dom_class(&*clasp) {
trace!("plain old dom object");
let domjsclass: *const DOMJSClass = clasp as *const DOMJSClass;
return Ok(&(&*domjsclass).dom_class);
}
if is_dom_proxy(obj) {
trace!("proxy dom object");
let dom_class: *const DOMClass = GetProxyHandlerExtra(obj) as *const DOMClass;
return Ok(&*dom_class);
}
trace!("not a dom object");
Err(())
}
pub(crate) enum PrototypeCheck {
Derive(fn(&'static DOMClass) -> bool),
Depth { depth: usize, proto_id: u16 },
}
#[inline]
pub(crate) unsafe fn private_from_proto_check(
mut obj: *mut JSObject,
cx: *mut JSContext,
proto_check: PrototypeCheck,
) -> Result<*const libc::c_void, ()> {
let dom_class = get_dom_class(obj).or_else(|_| {
if IsWrapper(obj) {
trace!("found wrapper");
obj = UnwrapObjectDynamic(obj, cx, false);
if obj.is_null() {
trace!("unwrapping security wrapper failed");
Err(())
} else {
assert!(!IsWrapper(obj));
trace!("unwrapped successfully");
get_dom_class(obj)
}
} else {
trace!("not a dom wrapper");
Err(())
}
})?;
let prototype_matches = match proto_check {
PrototypeCheck::Derive(f) => (f)(dom_class),
PrototypeCheck::Depth { depth, proto_id } => {
dom_class.interface_chain[depth] as u16 == proto_id
},
};
if prototype_matches {
trace!("good prototype");
Ok(private_from_object(obj))
} else {
trace!("bad prototype");
Err(())
}
}
#[inline]
unsafe fn private_from_proto_check_static(
obj: *mut JSObject,
proto_check: fn(&'static DOMClass) -> bool,
) -> Result<*const libc::c_void, ()> {
let dom_class = get_dom_class(obj).map_err(|_| ())?;
if proto_check(dom_class) {
trace!("good prototype");
Ok(private_from_object(obj))
} else {
trace!("bad prototype");
Err(())
}
}
pub fn native_from_object<T>(obj: *mut JSObject, cx: *mut JSContext) -> Result<*const T, ()>
where
T: DomObject + IDLInterface,
{
unsafe {
private_from_proto_check(obj, cx, PrototypeCheck::Derive(T::derives))
.map(|ptr| ptr as *const T)
}
}
pub fn native_from_object_static<T>(obj: *mut JSObject) -> Result<*const T, ()>
where
T: DomObject + IDLInterface,
{
unsafe { private_from_proto_check_static(obj, T::derives).map(|ptr| ptr as *const T) }
}
pub fn root_from_object<T>(obj: *mut JSObject, cx: *mut JSContext) -> Result<DomRoot<T>, ()>
where
T: DomObject + IDLInterface,
{
native_from_object(obj, cx).map(|ptr| unsafe { DomRoot::from_ref(&*ptr) })
}
pub fn root_from_object_static<T>(obj: *mut JSObject) -> Result<DomRoot<T>, ()>
where
T: DomObject + IDLInterface,
{
native_from_object_static(obj).map(|ptr| unsafe { DomRoot::from_ref(&*ptr) })
}
pub fn native_from_handlevalue<T>(v: HandleValue, cx: *mut JSContext) -> Result<*const T, ()>
where
T: DomObject + IDLInterface,
{
if !v.get().is_object() {
return Err(());
}
native_from_object(v.get().to_object(), cx)
}
pub fn root_from_handlevalue<T>(v: HandleValue, cx: *mut JSContext) -> Result<DomRoot<T>, ()>
where
T: DomObject + IDLInterface,
{
if !v.get().is_object() {
return Err(());
}
root_from_object(v.get().to_object(), cx)
}
pub fn root_from_handleobject<T>(obj: HandleObject, cx: *mut JSContext) -> Result<DomRoot<T>, ()>
where
T: DomObject + IDLInterface,
{
root_from_object(obj.get(), cx)
}
impl<T: DomObject> ToJSValConvertible for DomRoot<T> {
unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
self.reflector().to_jsval(cx, rval);
}
}
pub unsafe fn is_array_like(cx: *mut JSContext, value: HandleValue) -> bool {
let mut is_array = false;
assert!(IsArrayObject(cx, value, &mut is_array));
if is_array {
return true;
}
let object: *mut JSObject = match FromJSValConvertible::from_jsval(cx, value, ()).unwrap() {
ConversionResult::Success(object) => object,
_ => return false,
};
if root_from_object::<FileList>(object, cx).is_ok() {
return true;
}
if root_from_object::<HTMLCollection>(object, cx).is_ok() {
return true;
}
if root_from_object::<HTMLFormControlsCollection>(object, cx).is_ok() {
return true;
}
if root_from_object::<HTMLOptionsCollection>(object, cx).is_ok() {
return true;
}
if root_from_object::<NodeList>(object, cx).is_ok() {
return true;
}
false
}
pub unsafe fn get_property_jsval(
cx: *mut JSContext,
object: HandleObject,
name: &str,
mut rval: MutableHandleValue,
) -> Fallible<()> {
rval.set(UndefinedValue());
let cname = match ffi::CString::new(name) {
Ok(cname) => cname,
Err(_) => return Ok(()),
};
let mut found = false;
if JS_HasProperty(cx, object, cname.as_ptr(), &mut found) && found {
JS_GetProperty(cx, object, cname.as_ptr(), rval);
if JS_IsExceptionPending(cx) {
return Err(Error::JSFailed);
}
Ok(())
} else if JS_IsExceptionPending(cx) {
Err(Error::JSFailed)
} else {
Ok(())
}
}
pub unsafe fn get_property<T>(
cx: *mut JSContext,
object: HandleObject,
name: &str,
option: T::Config,
) -> Fallible<Option<T>>
where
T: FromJSValConvertible,
{
debug!("Getting property {}.", name);
rooted!(in(cx) let mut result = UndefinedValue());
get_property_jsval(cx, object, name, result.handle_mut())?;
if result.is_undefined() {
debug!("No property {}.", name);
return Ok(None);
}
debug!("Converting property {}.", name);
match T::from_jsval(cx, result.handle(), option) {
Ok(ConversionResult::Success(value)) => Ok(Some(value)),
Ok(ConversionResult::Failure(_)) => Ok(None),
Err(()) => Err(Error::JSFailed),
}
}
pub unsafe fn windowproxy_from_handlevalue(
v: HandleValue,
_cx: *mut JSContext,
) -> Result<DomRoot<WindowProxy>, ()> {
if !v.get().is_object() {
return Err(());
}
let object = v.get().to_object();
if !IsWindowProxy(object) {
return Err(());
}
let mut value = UndefinedValue();
GetProxyReservedSlot(object, 0, &mut value);
let ptr = value.to_private() as *const WindowProxy;
Ok(DomRoot::from_ref(&*ptr))
}