90 lines
2.1 KiB
Rust
90 lines
2.1 KiB
Rust
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use event::{Event, AbstractEvent};
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use std::any::Any;
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use std::sync::mpsc::Sender;
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use std::mem;
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use minidom::Element;
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#[derive(Clone)]
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pub struct PluginProxyBinding {
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sender: Sender<Element>,
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dispatcher: Sender<AbstractEvent>,
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}
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impl PluginProxyBinding {
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pub fn new(sender: Sender<Element>, dispatcher: Sender<AbstractEvent>) -> PluginProxyBinding {
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PluginProxyBinding {
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sender: sender,
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dispatcher: dispatcher,
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}
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}
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}
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pub enum PluginProxy {
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Unbound,
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BoundTo(PluginProxyBinding),
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}
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impl PluginProxy {
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pub fn new() -> PluginProxy {
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PluginProxy::Unbound
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}
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pub fn bind(&mut self, inner: PluginProxyBinding) {
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if let PluginProxy::BoundTo(_) = *self {
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panic!("trying to bind an already bound plugin proxy!");
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}
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mem::replace(self, PluginProxy::BoundTo(inner));
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}
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fn with_binding<R, F: FnOnce(&PluginProxyBinding) -> R>(&self, f: F) -> R {
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match *self {
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PluginProxy::Unbound => {
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panic!("trying to use an unbound plugin proxy!");
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},
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PluginProxy::BoundTo(ref binding) => {
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f(binding)
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},
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}
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}
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pub fn dispatch<E: Event>(&self, event: E) {
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self.with_binding(move |binding| {
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binding.dispatcher.send(AbstractEvent::new(event))
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.unwrap(); // TODO: may want to return the error
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});
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}
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pub fn send(&self, elem: Element) {
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self.with_binding(move |binding| {
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binding.sender.send(elem).unwrap(); // TODO: as above, may want to return the error
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});
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}
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum PluginReturn {
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Continue,
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Unload,
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}
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pub trait Plugin: Any + PluginAny {
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fn get_proxy(&mut self) -> &mut PluginProxy;
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fn handle(&mut self, _elem: &Element) -> PluginReturn { PluginReturn::Continue }
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fn bind(&mut self, inner: PluginProxyBinding) {
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self.get_proxy().bind(inner);
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}
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}
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pub trait PluginAny {
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fn as_any(&self) -> &Any;
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}
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impl<T: Any + Sized> PluginAny for T {
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fn as_any(&self) -> &Any { self }
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}
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