From a0c5d47910556c1df9a6947b2049a94a562c571c Mon Sep 17 00:00:00 2001
From: Till Schneidereit <till@tillschneidereit.net>
Date: Mon, 12 Oct 2015 16:03:42 +0200
Subject: Improve spec-compliance of script loading and execution during
 document startup

Including proper support for async and deferred scripts.
---
 components/script/document_loader.rs | 31 ++++++++++---------------------
 1 file changed, 10 insertions(+), 21 deletions(-)

(limited to 'components/script/document_loader.rs')

diff --git a/components/script/document_loader.rs b/components/script/document_loader.rs
index 65e875b538b..2cfa9096d9c 100644
--- a/components/script/document_loader.rs
+++ b/components/script/document_loader.rs
@@ -8,9 +8,7 @@
 use msg::constellation_msg::{PipelineId};
 use net_traits::AsyncResponseTarget;
 use net_traits::{Metadata, PendingAsyncLoad, ResourceTask, load_whole_resource};
-use script_task::MainThreadScriptMsg;
 use std::sync::Arc;
-use std::sync::mpsc::Sender;
 use url::Url;
 
 #[derive(JSTraceable, PartialEq, Clone, Debug, HeapSizeOf)]
@@ -40,15 +38,9 @@ pub struct DocumentLoader {
     /// are lots of iframes.
     #[ignore_heap_size_of = "channels are hard"]
     pub resource_task: Arc<ResourceTask>,
-    notifier_data: Option<NotifierData>,
+    pipeline: Option<PipelineId>,
     blocking_loads: Vec<LoadType>,
-}
-
-#[derive(JSTraceable, HeapSizeOf)]
-pub struct NotifierData {
-    #[ignore_heap_size_of = "trait objects are hard"]
-    pub script_chan: Sender<MainThreadScriptMsg>,
-    pub pipeline: PipelineId,
+    events_inhibited: bool,
 }
 
 impl DocumentLoader {
@@ -59,15 +51,16 @@ impl DocumentLoader {
     /// We use an `Arc<ResourceTask>` here in order to avoid file descriptor exhaustion when there
     /// are lots of iframes.
     pub fn new_with_task(resource_task: Arc<ResourceTask>,
-                         data: Option<NotifierData>,
+                         pipeline: Option<PipelineId>,
                          initial_load: Option<Url>)
                          -> DocumentLoader {
         let initial_loads = initial_load.into_iter().map(LoadType::PageSource).collect();
 
         DocumentLoader {
             resource_task: resource_task,
-            notifier_data: data,
+            pipeline: pipeline,
             blocking_loads: initial_loads,
+            events_inhibited: false,
         }
     }
 
@@ -76,8 +69,7 @@ impl DocumentLoader {
     pub fn prepare_async_load(&mut self, load: LoadType) -> PendingAsyncLoad {
         let url = load.url().clone();
         self.blocking_loads.push(load);
-        let pipeline = self.notifier_data.as_ref().map(|data| data.pipeline);
-        PendingAsyncLoad::new((*self.resource_task).clone(), url, pipeline)
+        PendingAsyncLoad::new((*self.resource_task).clone(), url, self.pipeline)
     }
 
     /// Create and initiate a new network request.
@@ -98,12 +90,6 @@ impl DocumentLoader {
     pub fn finish_load(&mut self, load: LoadType) {
         let idx = self.blocking_loads.iter().position(|unfinished| *unfinished == load);
         self.blocking_loads.remove(idx.expect(&format!("unknown completed load {:?}", load)));
-
-        if let Some(NotifierData { ref script_chan, pipeline }) = self.notifier_data {
-            if !self.is_blocked() {
-                script_chan.send(MainThreadScriptMsg::DocumentLoadsComplete(pipeline)).unwrap();
-            }
-        }
     }
 
     pub fn is_blocked(&self) -> bool {
@@ -112,6 +98,9 @@ impl DocumentLoader {
     }
 
     pub fn inhibit_events(&mut self) {
-        self.notifier_data = None;
+        self.events_inhibited = true;
+    }
+    pub fn events_inhibited(&self) -> bool {
+        self.events_inhibited
     }
 }
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