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libservo: Allow embedders to execute JavaScript scripts via the API (#35720)

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This change adds a new `WebView` API `evaluate_javascript()`, which
allows embedders to
execute JavaScript code and wait for a reply asynchronously. Ongoing
script execution is
tracked by a libservo `JavaScriptEvaluator` struct, which maps an id to
the callback passed
to the `evaluate_javascript()` method. The id is used to track the
script and its execution
through the other parts of Servo.

Testing: This changes includes `WebView` unit tests.

---------

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Narfinger 2025-05-13 14:54:18 +02:00 • committed by GitHub
parent 91c4c7b998
commit 991be359a3
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12 changed files with 391 additions and 18 deletions
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7
components/shared/script/lib.rs
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@ -27,8 +27,8 @@ use crossbeam_channel::{RecvTimeoutError, Sender};
use devtools_traits::ScriptToDevtoolsControlMsg;
use embedder_traits::user_content_manager::UserContentManager;
use embedder_traits::{
CompositorHitTestResult, FocusSequenceNumber, InputEvent, MediaSessionActionType, Theme,
ViewportDetails, WebDriverScriptCommand,
CompositorHitTestResult, FocusSequenceNumber, InputEvent, JavaScriptEvaluationId,
MediaSessionActionType, Theme, ViewportDetails, WebDriverScriptCommand,
};
use euclid::{Rect, Scale, Size2D, UnknownUnit};
use ipc_channel::ipc::{IpcReceiver, IpcSender};
@ -245,6 +245,9 @@ pub enum ScriptThreadMessage {
/// The compositor scrolled and is updating the scroll states of the nodes in the given
/// pipeline via the Constellation.
SetScrollStates(PipelineId, Vec<ScrollState>),
/// Evaluate the given JavaScript and return a result via a corresponding message
/// to the Constellation.
EvaluateJavaScript(PipelineId, JavaScriptEvaluationId, String),
}
impl fmt::Debug for ScriptThreadMessage {