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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/. */
#![allow(unsafe_code)]
//! Implementation of `iterable<...>` and `iterable<..., ...>` WebIDL declarations.
use core::nonzero::NonZero;
use dom::bindings::codegen::Bindings::IterableIteratorBinding::IterableKeyAndValueResult;
use dom::bindings::codegen::Bindings::IterableIteratorBinding::IterableKeyOrValueResult;
use dom::bindings::error::Fallible;
use dom::bindings::js::{JS, Root};
use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
use dom::bindings::trace::JSTraceable;
use dom::globalscope::GlobalScope;
use dom_struct::dom_struct;
use js::conversions::ToJSValConvertible;
use js::jsapi::{HandleValue, Heap, JSContext, JSObject, MutableHandleObject};
use js::jsval::UndefinedValue;
use std::cell::Cell;
use std::ptr;
/// The values that an iterator will iterate over.
#[derive(JSTraceable, HeapSizeOf)]
pub enum IteratorType {
/// The keys of the iterable object.
Keys,
/// The values of the iterable object.
Values,
/// The keys and values of the iterable object combined.
Entries,
}
/// A DOM object that can be iterated over using a pair value iterator.
pub trait Iterable {
/// The type of the key of the iterator pair.
type Key: ToJSValConvertible;
/// The type of the value of the iterator pair.
type Value: ToJSValConvertible;
/// Return the number of entries that can be iterated over.
fn get_iterable_length(&self) -> u32;
/// Return the value at the provided index.
fn get_value_at_index(&self, index: u32) -> Self::Value;
/// Return the key at the provided index.
fn get_key_at_index(&self, index: u32) -> Self::Key;
}
/// An iterator over the iterable entries of a given DOM interface.
//FIXME: #12811 prevents dom_struct with type parameters
#[dom_struct]
pub struct IterableIterator<T: DomObject + JSTraceable + Iterable> {
reflector: Reflector,
iterable: JS<T>,
type_: IteratorType,
index: Cell<u32>,
}
impl<T: DomObject + JSTraceable + Iterable> IterableIterator<T> {
/// Create a new iterator instance for the provided iterable DOM interface.
pub fn new(iterable: &T,
type_: IteratorType,
wrap: unsafe fn(*mut JSContext, &GlobalScope, Box<IterableIterator<T>>)
-> Root<Self>) -> Root<Self> {
let iterator = box IterableIterator {
reflector: Reflector::new(),
type_: type_,
iterable: JS::from_ref(iterable),
index: Cell::new(0),
};
reflect_dom_object(iterator, &*iterable.global(), wrap)
}
/// Return the next value from the iterable object.
#[allow(non_snake_case)]
pub fn Next(&self, cx: *mut JSContext) -> Fallible<NonZero<*mut JSObject>> {
let index = self.index.get();
rooted!(in(cx) let mut value = UndefinedValue());
rooted!(in(cx) let mut rval = ptr::null_mut());
let result = if index >= self.iterable.get_iterable_length() {
dict_return(cx, rval.handle_mut(), true, value.handle())
} else {
match self.type_ {
IteratorType::Keys => {
unsafe {
self.iterable.get_key_at_index(index).to_jsval(cx, value.handle_mut());
}
dict_return(cx, rval.handle_mut(), false, value.handle())
}
IteratorType::Values => {
unsafe {
self.iterable.get_value_at_index(index).to_jsval(cx, value.handle_mut());
}
dict_return(cx, rval.handle_mut(), false, value.handle())
}
IteratorType::Entries => {
rooted!(in(cx) let mut key = UndefinedValue());
unsafe {
self.iterable.get_key_at_index(index).to_jsval(cx, key.handle_mut());
self.iterable.get_value_at_index(index).to_jsval(cx, value.handle_mut());
}
key_and_value_return(cx, rval.handle_mut(), key.handle(), value.handle())
}
}
};
self.index.set(index + 1);
result.map(|_| {
assert!(!rval.is_null());
unsafe { NonZero::new(rval.get()) }
})
}
}
fn dict_return(cx: *mut JSContext,
result: MutableHandleObject,
done: bool,
value: HandleValue) -> Fallible<()> {
let mut dict = unsafe { IterableKeyOrValueResult::empty(cx) };
dict.done = done;
dict.value.set(value.get());
rooted!(in(cx) let mut dict_value = UndefinedValue());
unsafe {
dict.to_jsval(cx, dict_value.handle_mut());
}
result.set(dict_value.to_object());
Ok(())
}
fn key_and_value_return(cx: *mut JSContext,
result: MutableHandleObject,
key: HandleValue,
value: HandleValue) -> Fallible<()> {
let mut dict = unsafe { IterableKeyAndValueResult::empty(cx) };
dict.done = false;
dict.value = Some(vec![Heap::new(key.get()), Heap::new(value.get())]);
rooted!(in(cx) let mut dict_value = UndefinedValue());
unsafe {
dict.to_jsval(cx, dict_value.handle_mut());
}
result.set(dict_value.to_object());
Ok(())
}
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