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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 https://mozilla.org/MPL/2.0/. */
use std::collections::HashMap;
use base::id::WebViewId;
use constellation_traits::EmbedderToConstellationMessage;
use embedder_traits::{JSValue, JavaScriptEvaluationError, JavaScriptEvaluationId};
use crate::ConstellationProxy;
struct PendingEvaluation {
callback: Box<dyn FnOnce(Result<JSValue, JavaScriptEvaluationError>)>,
}
pub(crate) struct JavaScriptEvaluator {
current_id: JavaScriptEvaluationId,
constellation_proxy: ConstellationProxy,
pending_evaluations: HashMap<JavaScriptEvaluationId, PendingEvaluation>,
}
impl JavaScriptEvaluator {
pub(crate) fn new(constellation_proxy: ConstellationProxy) -> Self {
Self {
current_id: JavaScriptEvaluationId(0),
constellation_proxy,
pending_evaluations: Default::default(),
}
}
fn generate_id(&mut self) -> JavaScriptEvaluationId {
let next_id = JavaScriptEvaluationId(self.current_id.0 + 1);
std::mem::replace(&mut self.current_id, next_id)
}
pub(crate) fn evaluate(
&mut self,
webview_id: WebViewId,
script: String,
callback: Box<dyn FnOnce(Result<JSValue, JavaScriptEvaluationError>)>,
) {
let evaluation_id = self.generate_id();
self.constellation_proxy
.send(EmbedderToConstellationMessage::EvaluateJavaScript(
webview_id,
evaluation_id,
script,
));
self.pending_evaluations
.insert(evaluation_id, PendingEvaluation { callback });
}
pub(crate) fn finish_evaluation(
&mut self,
evaluation_id: JavaScriptEvaluationId,
result: Result<JSValue, JavaScriptEvaluationError>,
) {
(self
.pending_evaluations
.remove(&evaluation_id)
.expect("Received request to finish unknown JavaScript evaluation.")
.callback)(result)
}
}
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