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https://github.com/servo/servo.git
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780 lines
26 KiB
Rust
780 lines
26 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Conversions of Rust values to and from `JSVal`.
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//!
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//! | IDL type | Argument type | Return type |
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//! |-------------------------|-----------------|----------------|
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//! | any | `JSVal` |
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//! | boolean | `bool` |
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//! | byte | `i8` |
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//! | octet | `u8` |
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//! | short | `i16` |
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//! | unsigned short | `u16` |
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//! | long | `i32` |
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//! | unsigned long | `u32` |
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//! | long long | `i64` |
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//! | unsigned long long | `u64` |
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//! | unrestricted float | `f32` |
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//! | float | `Finite<f32>` |
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//! | unrestricted double | `f64` |
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//! | double | `Finite<f64>` |
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//! | DOMString | `DOMString` |
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//! | USVString | `USVString` |
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//! | ByteString | `ByteString` |
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//! | object | `*mut JSObject` |
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//! | interface types | `&T` | `Root<T>` |
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//! | dictionary types | `&T` | *unsupported* |
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//! | enumeration types | `T` |
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//! | callback function types | `Rc<T>` |
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//! | nullable types | `Option<T>` |
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//! | sequences | `Vec<T>` |
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//! | union types | `T` |
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use core::nonzero::NonZero;
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use dom::bindings::codegen::PrototypeList;
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use dom::bindings::error::throw_type_error;
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use dom::bindings::js::Root;
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use dom::bindings::num::Finite;
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use dom::bindings::str::{ByteString, USVString};
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use dom::bindings::utils::{DOMClass, Reflectable, Reflector};
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use js;
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use js::glue::{GetProxyPrivate, IsWrapper, RUST_JS_NumberValue};
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use js::glue::{RUST_JSID_IS_STRING, RUST_JSID_TO_STRING, UnwrapObject};
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use js::jsapi::{HandleId, HandleObject, HandleValue, JS_GetClass};
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use js::jsapi::{JSClass, JSContext, JSObject, JSString, MutableHandleValue};
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use js::jsapi::{JS_GetLatin1StringCharsAndLength, JS_GetReservedSlot};
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use js::jsapi::{JS_GetTwoByteStringCharsAndLength, JS_NewStringCopyN};
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use js::jsapi::{JS_NewUCStringCopyN, JS_StringHasLatin1Chars, JS_WrapValue};
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use js::jsval::{BooleanValue, Int32Value, NullValue, UInt32Value, UndefinedValue};
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use js::jsval::{JSVal, ObjectOrNullValue, ObjectValue, StringValue};
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use js::rust::{ToBoolean, ToNumber, ToString, ToUint16};
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use js::rust::{ToInt32, ToUint32};
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use js::rust::{ToInt64, ToUint64};
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use libc;
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use num::Float;
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use num::traits::{Bounded, Zero};
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use std::borrow::ToOwned;
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use std::rc::Rc;
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use std::{char, ptr, slice};
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use util::str::DOMString;
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trait As<O>: Copy {
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fn cast(self) -> O;
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}
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macro_rules! impl_as {
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($I:ty, $O:ty) => (
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impl As<$O> for $I {
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fn cast(self) -> $O {
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self as $O
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}
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}
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)
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}
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impl_as!(f64, u8);
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impl_as!(f64, u16);
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impl_as!(f64, u32);
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impl_as!(f64, u64);
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impl_as!(f64, i8);
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impl_as!(f64, i16);
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impl_as!(f64, i32);
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impl_as!(f64, i64);
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impl_as!(u8, f64);
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impl_as!(u16, f64);
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impl_as!(u32, f64);
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impl_as!(u64, f64);
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impl_as!(i8, f64);
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impl_as!(i16, f64);
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impl_as!(i32, f64);
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impl_as!(i64, f64);
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impl_as!(i32, i8);
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impl_as!(i32, u8);
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impl_as!(i32, i16);
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impl_as!(u16, u16);
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impl_as!(i32, i32);
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impl_as!(u32, u32);
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impl_as!(i64, i64);
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impl_as!(u64, u64);
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/// A trait to retrieve the constants necessary to check if a `JSObject`
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/// implements a given interface.
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pub trait IDLInterface {
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/// Returns the prototype ID.
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fn get_prototype_id() -> PrototypeList::ID;
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/// Returns the prototype depth, i.e., the number of interfaces this
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/// interface inherits from.
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fn get_prototype_depth() -> usize;
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}
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/// A trait to convert Rust types to `JSVal`s.
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pub trait ToJSValConvertible {
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/// Convert `self` to a `JSVal`. JSAPI failure causes a task failure.
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fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue);
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}
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/// A trait to convert `JSVal`s to Rust types.
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pub trait FromJSValConvertible: Sized {
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/// Optional configurable behaviour switch; use () for no configuration.
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type Config;
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/// Convert `val` to type `Self`.
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/// Optional configuration of type `T` can be passed as the `option`
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/// argument.
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/// If it returns `Err(())`, a JSAPI exception is pending.
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: Self::Config) -> Result<Self, ()>;
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}
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/// Behavior for converting out-of-range integers.
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#[derive(PartialEq, Eq)]
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pub enum ConversionBehavior {
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/// Wrap into the integer's range.
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Default,
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/// Throw an exception.
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EnforceRange,
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/// Clamp into the integer's range.
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Clamp
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}
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/// Try to cast the number to a smaller type, but
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/// if it doesn't fit, it will return an error.
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fn enforce_range<D>(cx: *mut JSContext, d: f64) -> Result<D, ()>
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where D: Bounded + As<f64>,
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f64: As<D>
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{
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if d.is_infinite() {
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throw_type_error(cx, "value out of range in an EnforceRange argument");
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return Err(());
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}
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let rounded = d.round();
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if D::min_value().cast() <= rounded && rounded <= D::max_value().cast() {
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Ok(rounded.cast())
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} else {
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throw_type_error(cx, "value out of range in an EnforceRange argument");
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Err(())
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}
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}
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/// Try to cast the number to a smaller type, but if it doesn't fit,
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/// round it to the MAX or MIN of the source type before casting it to
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/// the destination type.
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fn clamp_to<D>(d: f64) -> D
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where D: Bounded + As<f64> + Zero,
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f64: As<D>
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{
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if d.is_nan() {
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D::zero()
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} else if d > D::max_value().cast() {
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D::max_value()
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} else if d < D::min_value().cast() {
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D::min_value()
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} else {
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d.cast()
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}
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}
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impl ToJSValConvertible for () {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(UndefinedValue());
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}
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}
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impl ToJSValConvertible for JSVal {
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fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(*self);
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if unsafe { !JS_WrapValue(cx, rval) } {
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panic!("JS_WrapValue failed.");
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}
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}
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}
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impl ToJSValConvertible for HandleValue {
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fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(self.get());
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if unsafe { !JS_WrapValue(cx, rval) } {
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panic!("JS_WrapValue failed.");
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}
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}
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}
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#[inline]
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fn convert_int_from_jsval<T, M>(cx: *mut JSContext, value: HandleValue,
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option: ConversionBehavior,
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convert_fn: fn(*mut JSContext, HandleValue) -> Result<M, ()>)
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-> Result<T, ()>
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where T: Bounded + Zero + As<f64>,
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M: Zero + As<T>,
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f64: As<T>
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{
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match option {
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ConversionBehavior::Default => Ok(try!(convert_fn(cx, value)).cast()),
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ConversionBehavior::EnforceRange => enforce_range(cx, try!(ToNumber(cx, value))),
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ConversionBehavior::Clamp => Ok(clamp_to(try!(ToNumber(cx, value)))),
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}
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}
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impl ToJSValConvertible for bool {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(BooleanValue(*self));
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}
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}
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impl FromJSValConvertible for bool {
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type Config = ();
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fn from_jsval(_cx: *mut JSContext, val: HandleValue, _option: ()) -> Result<bool, ()> {
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Ok(ToBoolean(val))
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}
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}
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impl ToJSValConvertible for i8 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(Int32Value(*self as i32));
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}
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}
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impl FromJSValConvertible for i8 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<i8, ()> {
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convert_int_from_jsval(cx, val, option, ToInt32)
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}
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}
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impl ToJSValConvertible for u8 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(Int32Value(*self as i32));
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}
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}
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impl FromJSValConvertible for u8 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<u8, ()> {
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convert_int_from_jsval(cx, val, option, ToInt32)
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}
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}
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impl ToJSValConvertible for i16 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(Int32Value(*self as i32));
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}
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}
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impl FromJSValConvertible for i16 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<i16, ()> {
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convert_int_from_jsval(cx, val, option, ToInt32)
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}
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}
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impl ToJSValConvertible for u16 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(Int32Value(*self as i32));
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}
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}
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impl FromJSValConvertible for u16 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<u16, ()> {
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convert_int_from_jsval(cx, val, option, ToUint16)
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}
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}
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impl ToJSValConvertible for i32 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(Int32Value(*self));
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}
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}
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impl FromJSValConvertible for i32 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<i32, ()> {
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convert_int_from_jsval(cx, val, option, ToInt32)
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}
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}
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impl ToJSValConvertible for u32 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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rval.set(UInt32Value(*self));
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}
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}
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impl FromJSValConvertible for u32 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<u32, ()> {
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convert_int_from_jsval(cx, val, option, ToUint32)
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}
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}
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impl ToJSValConvertible for i64 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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unsafe {
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rval.set(RUST_JS_NumberValue(*self as f64));
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}
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}
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}
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impl FromJSValConvertible for i64 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<i64, ()> {
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convert_int_from_jsval(cx, val, option, ToInt64)
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}
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}
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impl ToJSValConvertible for u64 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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unsafe {
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rval.set(RUST_JS_NumberValue(*self as f64));
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}
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}
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}
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impl FromJSValConvertible for u64 {
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type Config = ConversionBehavior;
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fn from_jsval(cx: *mut JSContext, val: HandleValue, option: ConversionBehavior) -> Result<u64, ()> {
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convert_int_from_jsval(cx, val, option, ToUint64)
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}
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}
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impl ToJSValConvertible for f32 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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unsafe {
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rval.set(RUST_JS_NumberValue(*self as f64));
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}
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}
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}
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impl FromJSValConvertible for f32 {
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type Config = ();
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fn from_jsval(cx: *mut JSContext, val: HandleValue, _option: ()) -> Result<f32, ()> {
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let result = ToNumber(cx, val);
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result.map(|f| f as f32)
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}
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}
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impl ToJSValConvertible for f64 {
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fn to_jsval(&self, _cx: *mut JSContext, rval: MutableHandleValue) {
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unsafe {
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rval.set(RUST_JS_NumberValue(*self));
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}
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}
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}
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impl FromJSValConvertible for f64 {
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type Config = ();
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fn from_jsval(cx: *mut JSContext, val: HandleValue, _option: ()) -> Result<f64, ()> {
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ToNumber(cx, val)
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}
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}
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impl<T: Float + ToJSValConvertible> ToJSValConvertible for Finite<T> {
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#[inline]
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fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
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let value = **self;
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value.to_jsval(cx, rval);
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}
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}
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impl<T: Float + FromJSValConvertible<Config=()>> FromJSValConvertible for Finite<T> {
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type Config = ();
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fn from_jsval(cx: *mut JSContext, value: HandleValue, option: ()) -> Result<Finite<T>, ()> {
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let result = try!(FromJSValConvertible::from_jsval(cx, value, option));
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match Finite::new(result) {
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Some(v) => Ok(v),
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None => {
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throw_type_error(cx, "this argument is not a finite floating-point value");
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Err(())
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},
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}
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}
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}
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impl ToJSValConvertible for str {
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fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
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let mut string_utf16: Vec<u16> = Vec::with_capacity(self.len());
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unsafe {
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string_utf16.extend(self.utf16_units());
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let jsstr = JS_NewUCStringCopyN(cx, string_utf16.as_ptr(),
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string_utf16.len() as libc::size_t);
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if jsstr.is_null() {
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panic!("JS_NewUCStringCopyN failed");
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}
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rval.set(StringValue(&*jsstr));
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}
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}
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}
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impl ToJSValConvertible for DOMString {
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fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
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(**self).to_jsval(cx, rval);
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}
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}
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/// Behavior for stringification of `JSVal`s.
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#[derive(PartialEq)]
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pub enum StringificationBehavior {
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/// Convert `null` to the string `"null"`.
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Default,
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/// Convert `null` to the empty string.
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Empty,
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}
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/// Convert the given `JSString` to a `DOMString`. Fails if the string does not
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/// contain valid UTF-16.
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pub fn jsstring_to_str(cx: *mut JSContext, s: *mut JSString) -> DOMString {
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let mut length = 0;
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let latin1 = unsafe { JS_StringHasLatin1Chars(s) };
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if latin1 {
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let chars = unsafe {
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JS_GetLatin1StringCharsAndLength(cx, ptr::null(), s, &mut length)
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};
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assert!(!chars.is_null());
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let mut buf = String::with_capacity(length as usize);
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for i in 0..(length as isize) {
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unsafe {
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buf.push(*chars.offset(i) as char);
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}
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}
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buf
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} else {
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let chars = unsafe {
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JS_GetTwoByteStringCharsAndLength(cx, ptr::null(), s, &mut length)
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};
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assert!(!chars.is_null());
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let potentially_ill_formed_utf16 = unsafe {
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slice::from_raw_parts(chars as *const u16, length as usize)
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};
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let mut s = String::with_capacity(length as usize);
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for item in char::decode_utf16(potentially_ill_formed_utf16.iter().cloned()) {
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match item {
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Ok(c) => s.push(c),
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Err(_) => {
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// FIXME: Add more info like document URL in the message?
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macro_rules! message {
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() => {
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"Found an unpaired surrogate in a DOM string. \
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If you see this in real web content, \
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please comment on https://github.com/servo/servo/issues/6564"
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}
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}
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if ::util::opts::get().replace_surrogates {
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error!(message!());
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s.push('\u{FFFD}');
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} else {
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panic!(concat!(message!(), " Use `-Z replace-surrogates` \
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on the command line to make this non-fatal."));
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}
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}
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}
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}
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s
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}
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}
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/// Convert the given `jsid` to a `DOMString`. Fails if the `jsid` is not a
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/// string, or if the string does not contain valid UTF-16.
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pub fn jsid_to_str(cx: *mut JSContext, id: HandleId) -> DOMString {
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unsafe {
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assert!(RUST_JSID_IS_STRING(id));
|
|
jsstring_to_str(cx, RUST_JSID_TO_STRING(id))
|
|
}
|
|
}
|
|
|
|
impl FromJSValConvertible for DOMString {
|
|
type Config = StringificationBehavior;
|
|
fn from_jsval(cx: *mut JSContext, value: HandleValue,
|
|
null_behavior: StringificationBehavior)
|
|
-> Result<DOMString, ()> {
|
|
if null_behavior == StringificationBehavior::Empty &&
|
|
value.get().is_null() {
|
|
Ok("".to_owned())
|
|
} else {
|
|
let jsstr = ToString(cx, value);
|
|
if jsstr.is_null() {
|
|
debug!("ToString failed");
|
|
Err(())
|
|
} else {
|
|
Ok(jsstring_to_str(cx, jsstr))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ToJSValConvertible for USVString {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
self.0.to_jsval(cx, rval);
|
|
}
|
|
}
|
|
|
|
impl FromJSValConvertible for USVString {
|
|
type Config = ();
|
|
fn from_jsval(cx: *mut JSContext, value: HandleValue, _: ())
|
|
-> Result<USVString, ()> {
|
|
let jsstr = ToString(cx, value);
|
|
if jsstr.is_null() {
|
|
debug!("ToString failed");
|
|
return Err(());
|
|
}
|
|
let latin1 = unsafe { JS_StringHasLatin1Chars(jsstr) };
|
|
if latin1 {
|
|
return Ok(USVString(jsstring_to_str(cx, jsstr)));
|
|
}
|
|
unsafe {
|
|
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(USVString(String::from_utf16_lossy(char_vec)))
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ToJSValConvertible for ByteString {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
unsafe {
|
|
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 = ();
|
|
fn from_jsval(cx: *mut JSContext, value: HandleValue, _option: ()) -> Result<ByteString, ()> {
|
|
let string = ToString(cx, value);
|
|
if string.is_null() {
|
|
debug!("ToString failed");
|
|
return Err(());
|
|
}
|
|
|
|
let latin1 = unsafe { JS_StringHasLatin1Chars(string) };
|
|
if latin1 {
|
|
let mut length = 0;
|
|
let chars = unsafe {
|
|
JS_GetLatin1StringCharsAndLength(cx, ptr::null(),
|
|
string, &mut length)
|
|
};
|
|
assert!(!chars.is_null());
|
|
|
|
let char_slice = unsafe {
|
|
slice::from_raw_parts(chars as *mut u8, length as usize)
|
|
};
|
|
|
|
return Ok(ByteString::new(char_slice.to_vec()));
|
|
}
|
|
|
|
unsafe {
|
|
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(ByteString::new(char_vec.iter().map(|&c| c as u8).collect()))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ToJSValConvertible for Reflector {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
let obj = self.get_jsobject().get();
|
|
assert!(!obj.is_null());
|
|
rval.set(ObjectValue(unsafe { &*obj }));
|
|
if unsafe { !JS_WrapValue(cx, rval) } {
|
|
panic!("JS_WrapValue failed.");
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Returns whether the given `clasp` is one for a DOM object.
|
|
pub fn is_dom_class(clasp: *const JSClass) -> bool {
|
|
unsafe {
|
|
((*clasp).flags & js::JSCLASS_IS_DOMJSCLASS) != 0
|
|
}
|
|
}
|
|
|
|
/// Returns whether `obj` is a DOM object implemented as a proxy.
|
|
pub fn is_dom_proxy(obj: *mut JSObject) -> bool {
|
|
use js::glue::IsProxyHandlerFamily;
|
|
unsafe {
|
|
let clasp = JS_GetClass(obj);
|
|
((*clasp).flags & js::JSCLASS_IS_PROXY) != 0 && IsProxyHandlerFamily(obj) != 0
|
|
}
|
|
}
|
|
|
|
/// The index of the slot wherein a pointer to the reflected DOM object is
|
|
/// stored for non-proxy bindings.
|
|
// We use slot 0 for holding the raw object. This is safe for both
|
|
// globals and non-globals.
|
|
pub const DOM_OBJECT_SLOT: u32 = 0;
|
|
|
|
/// Get the private pointer of a DOM object from a given reflector.
|
|
unsafe fn private_from_reflector(obj: *mut JSObject) -> *const libc::c_void {
|
|
let clasp = JS_GetClass(obj);
|
|
let value = if is_dom_class(clasp) {
|
|
JS_GetReservedSlot(obj, DOM_OBJECT_SLOT)
|
|
} else {
|
|
debug_assert!(is_dom_proxy(obj));
|
|
GetProxyPrivate(obj)
|
|
};
|
|
if value.is_undefined() {
|
|
ptr::null()
|
|
} else {
|
|
value.to_private()
|
|
}
|
|
}
|
|
|
|
/// Get the DOM object from the given reflector.
|
|
pub unsafe fn native_from_reflector<T>(obj: *mut JSObject) -> *const T {
|
|
private_from_reflector(obj) as *const T
|
|
}
|
|
|
|
/// Get the `DOMClass` from `obj`, or `Err(())` if `obj` is not a DOM object.
|
|
pub unsafe fn get_dom_class(obj: *mut JSObject) -> Result<&'static DOMClass, ()> {
|
|
use dom::bindings::utils::DOMJSClass;
|
|
use js::glue::GetProxyHandlerExtra;
|
|
|
|
let clasp = JS_GetClass(obj);
|
|
if is_dom_class(&*clasp) {
|
|
debug!("plain old dom object");
|
|
let domjsclass: *const DOMJSClass = clasp as *const DOMJSClass;
|
|
return Ok(&(&*domjsclass).dom_class);
|
|
}
|
|
if is_dom_proxy(obj) {
|
|
debug!("proxy dom object");
|
|
let dom_class: *const DOMClass = GetProxyHandlerExtra(obj) as *const DOMClass;
|
|
return Ok(&*dom_class);
|
|
}
|
|
debug!("not a dom object");
|
|
Err(())
|
|
}
|
|
|
|
/// Get a `*const libc::c_void` for the given DOM object, unwrapping any
|
|
/// wrapper around it first, and checking if the object is of the correct type.
|
|
///
|
|
/// Returns Err(()) if `obj` is an opaque security wrapper or if the object is
|
|
/// not an object for a DOM object of the given type (as defined by the
|
|
/// proto_id and proto_depth).
|
|
pub unsafe fn private_from_proto_chain(mut obj: *mut JSObject,
|
|
proto_id: u16, proto_depth: u16)
|
|
-> Result<*const libc::c_void, ()> {
|
|
let dom_class = try!(get_dom_class(obj).or_else(|_| {
|
|
if IsWrapper(obj) {
|
|
debug!("found wrapper");
|
|
obj = UnwrapObject(obj, /* stopAtOuter = */ 0);
|
|
if obj.is_null() {
|
|
debug!("unwrapping security wrapper failed");
|
|
Err(())
|
|
} else {
|
|
assert!(!IsWrapper(obj));
|
|
debug!("unwrapped successfully");
|
|
get_dom_class(obj)
|
|
}
|
|
} else {
|
|
debug!("not a dom wrapper");
|
|
Err(())
|
|
}
|
|
}));
|
|
|
|
if dom_class.interface_chain[proto_depth as usize] as u16 == proto_id {
|
|
debug!("good prototype");
|
|
Ok(private_from_reflector(obj))
|
|
} else {
|
|
debug!("bad prototype");
|
|
Err(())
|
|
}
|
|
}
|
|
|
|
/// Get a `Root<T>` for the given DOM object, unwrapping any wrapper
|
|
/// around it first, and checking if the object is of the correct type.
|
|
///
|
|
/// Returns Err(()) if `obj` is an opaque security wrapper or if the object is
|
|
/// not a reflector for a DOM object of the given type (as defined by the
|
|
/// proto_id and proto_depth).
|
|
pub fn native_from_reflector_jsmanaged<T>(obj: *mut JSObject) -> Result<Root<T>, ()>
|
|
where T: Reflectable + IDLInterface
|
|
{
|
|
let proto_id = <T as IDLInterface>::get_prototype_id() as u16;
|
|
let proto_depth = <T as IDLInterface>::get_prototype_depth() as u16;
|
|
unsafe {
|
|
private_from_proto_chain(obj, proto_id, proto_depth).map(|obj| {
|
|
Root::new(NonZero::new(obj as *const T))
|
|
})
|
|
}
|
|
}
|
|
|
|
/// Get a Rooted<T> for a DOM object accessible from a HandleValue
|
|
pub fn native_from_handlevalue<T>(v: HandleValue) -> Result<Root<T>, ()>
|
|
where T: Reflectable + IDLInterface
|
|
{
|
|
native_from_reflector_jsmanaged(v.get().to_object())
|
|
}
|
|
|
|
/// Get a Rooted<T> for a DOM object accessible from a HandleObject
|
|
pub fn native_from_handleobject<T>(obj: HandleObject) -> Result<Root<T>, ()>
|
|
where T: Reflectable + IDLInterface
|
|
{
|
|
native_from_reflector_jsmanaged(obj.get())
|
|
}
|
|
|
|
impl<T: Reflectable> ToJSValConvertible for Root<T> {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
self.r().reflector().to_jsval(cx, rval);
|
|
}
|
|
}
|
|
|
|
impl<'a, T: Reflectable> ToJSValConvertible for &'a T {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
self.reflector().to_jsval(cx, rval);
|
|
}
|
|
}
|
|
|
|
impl<T: ToJSValConvertible> ToJSValConvertible for Option<T> {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
match self {
|
|
&Some(ref value) => value.to_jsval(cx, rval),
|
|
&None => rval.set(NullValue()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<T: ToJSValConvertible> ToJSValConvertible for Option<Rc<T>> {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
match self {
|
|
&Some(ref value) => (**value).to_jsval(cx, rval),
|
|
&None => rval.set(NullValue()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<T: FromJSValConvertible> FromJSValConvertible for Option<T> {
|
|
type Config = T::Config;
|
|
fn from_jsval(cx: *mut JSContext, value: HandleValue, option: T::Config) -> Result<Option<T>, ()> {
|
|
if value.get().is_null_or_undefined() {
|
|
Ok(None)
|
|
} else {
|
|
let result: Result<T, ()> = FromJSValConvertible::from_jsval(cx, value, option);
|
|
result.map(Some)
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ToJSValConvertible for *mut JSObject {
|
|
fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
|
|
rval.set(ObjectOrNullValue(*self));
|
|
unsafe {
|
|
assert!(JS_WrapValue(cx, rval));
|
|
}
|
|
}
|
|
}
|