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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/. */
//! The `MozMap` (open-ended dictionary) type.
use crate::dom::bindings::conversions::jsid_to_string;
use crate::dom::bindings::error::report_pending_exception;
use crate::dom::bindings::str::DOMString;
use js::conversions::{ConversionResult, FromJSValConvertible, ToJSValConvertible};
use js::jsapi::JSContext;
use js::jsapi::JS_NewPlainObject;
use js::jsapi::JSITER_HIDDEN;
use js::jsapi::JSITER_OWNONLY;
use js::jsapi::JSITER_SYMBOLS;
use js::jsapi::JSPROP_ENUMERATE;
use js::jsval::ObjectValue;
use js::jsval::UndefinedValue;
use js::rust::wrappers::GetPropertyKeys;
use js::rust::wrappers::JS_DefineUCProperty2;
use js::rust::wrappers::JS_GetPropertyById;
use js::rust::HandleValue;
use js::rust::IdVector;
use js::rust::MutableHandleValue;
use std::collections::HashMap;
use std::ops::Deref;
/// The `MozMap` (open-ended dictionary) type.
#[derive(Clone, JSTraceable)]
pub struct MozMap<T> {
map: HashMap<DOMString, T>,
}
impl<T> MozMap<T> {
/// Create an empty `MozMap`.
pub fn new() -> Self {
MozMap {
map: HashMap::new(),
}
}
}
impl<T> Deref for MozMap<T> {
type Target = HashMap<DOMString, T>;
fn deref(&self) -> &HashMap<DOMString, T> {
&self.map
}
}
impl<T, C> FromJSValConvertible for MozMap<T>
where
T: FromJSValConvertible<Config = C>,
C: Clone,
{
type Config = C;
unsafe fn from_jsval(
cx: *mut JSContext,
value: HandleValue,
config: C,
) -> Result<ConversionResult<Self>, ()> {
if !value.is_object() {
return Ok(ConversionResult::Failure(
"MozMap value was not an object".into(),
));
}
rooted!(in(cx) let object = value.to_object());
let ids = IdVector::new(cx);
if !GetPropertyKeys(
cx,
object.handle(),
JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS,
ids.get(),
) {
// TODO: can GetPropertyKeys fail?
// (it does so if the object has duplicate keys)
// https://github.com/servo/servo/issues/21462
report_pending_exception(cx, false);
return Ok(ConversionResult::Failure(
"Getting MozMap value property keys failed".into(),
));
}
let mut map = HashMap::new();
for id in &*ids {
rooted!(in(cx) let id = *id);
rooted!(in(cx) let mut property = UndefinedValue());
if !JS_GetPropertyById(cx, object.handle(), id.handle(), property.handle_mut()) {
return Err(());
}
let property = match T::from_jsval(cx, property.handle(), config.clone())? {
ConversionResult::Success(property) => property,
ConversionResult::Failure(message) => return Ok(ConversionResult::Failure(message)),
};
// TODO: Is this guaranteed to succeed?
// https://github.com/servo/servo/issues/21463
if let Some(key) = jsid_to_string(cx, id.handle()) {
map.insert(key, property);
}
}
Ok(ConversionResult::Success(MozMap { map: map }))
}
}
impl<T: ToJSValConvertible> ToJSValConvertible for MozMap<T> {
#[inline]
unsafe fn to_jsval(&self, cx: *mut JSContext, mut rval: MutableHandleValue) {
rooted!(in(cx) let js_object = JS_NewPlainObject(cx));
assert!(!js_object.handle().is_null());
rooted!(in(cx) let mut js_value = UndefinedValue());
for (key, value) in &self.map {
let key = key.encode_utf16().collect::<Vec<_>>();
value.to_jsval(cx, js_value.handle_mut());
assert!(JS_DefineUCProperty2(
cx,
js_object.handle(),
key.as_ptr(),
key.len(),
js_value.handle(),
JSPROP_ENUMERATE as u32
));
}
rval.set(ObjectValue(js_object.handle().get()));
}
}
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