751 lines
27 KiB
Rust
751 lines
27 KiB
Rust
//! Managed presentation contexts. The active desktop owns the mount dictionary;
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//! reverse links and the host registry are weak, so shared content cannot retain a Page.
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use crate::document::{Frame, MountGeometry};
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use endor_core::{
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ContextNativeFunction, NativeCallable, NativeContext, NativeResult, ObjectPayload, ObjectRef,
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Value, Vm, VmError, WeakObjectRef,
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};
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use std::{
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collections::HashMap,
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sync::{Arc, Mutex},
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};
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#[derive(Debug, Clone)]
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pub struct Mount {
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pub block: ObjectRef,
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pub page: Option<WeakObjectRef>,
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pub parent: Option<WeakObjectRef>,
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pub first_child: Option<WeakObjectRef>,
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pub next_sibling: Option<WeakObjectRef>,
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pub geometry: MountGeometry,
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pub scroll_offset: [f32; 2],
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pub version: u64,
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pub mounted: bool,
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pub tasks: Option<ObjectRef>,
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// Private derived scratch, installed before the read-only layout call and
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// cleared by geometry commit. It contains no managed references or roots.
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pub layout: Option<Arc<Mutex<crate::layout::Context>>>,
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}
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impl ObjectPayload for Mount {
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fn reference_assignment_only(&self) -> bool {
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true
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}
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fn as_any(&self) -> &dyn std::any::Any {
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self
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}
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fn kind_name(&self) -> &'static str {
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"tessera-mount"
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}
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fn allows_attributes(&self) -> bool {
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true
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}
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fn trace(&self, visit: &mut dyn FnMut(ObjectRef)) {
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visit(self.block);
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if let Some(tasks) = self.tasks {
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visit(tasks);
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}
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}
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}
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#[derive(Debug, Clone, Copy)]
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enum Query {
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Bounds,
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ScrollTo,
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ScrollBy,
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ScrollPosition,
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ScrollIntoView,
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Parent,
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FirstChild,
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NextSibling,
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Page,
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Focus,
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HitTest,
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}
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#[derive(Debug)]
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struct Method {
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signature: endor_core::CallSignature,
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owner: ObjectRef,
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desktop: WeakObjectRef,
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query: Query,
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}
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impl NativeCallable for Method {
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fn signature(&self) -> Option<endor_core::CallSignature> {
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Some(self.signature.clone())
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}
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fn arity(&self) -> Option<endor_core::CallArity> {
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Some(endor_core::CallArity::exact(
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if matches!(
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self.query,
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Query::HitTest | Query::ScrollTo | Query::ScrollBy
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) {
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2
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} else {
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0
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},
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))
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}
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fn invoke(&self, cx: &mut NativeContext<'_>, args: &[Value]) -> Result<NativeResult, VmError> {
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let mount = cx.store().payload::<Mount>(self.owner, "Mount")?.clone();
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if !mount.mounted
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&& matches!(
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self.query,
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Query::Bounds
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| Query::Focus
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| Query::HitTest
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| Query::ScrollTo
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| Query::ScrollBy
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| Query::ScrollIntoView
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| Query::ScrollPosition
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)
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{
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return Err(VmError::InvalidArgument("Mount is no longer attached"));
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}
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let arity = if matches!(
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self.query,
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Query::HitTest | Query::ScrollTo | Query::ScrollBy
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) {
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2
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} else {
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0
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};
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if args.len() != arity {
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return Err(VmError::InvalidArgument("incorrect Mount method arity"));
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}
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let value = match self.query {
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Query::ScrollTo | Query::ScrollBy => {
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crate::scroll::set(
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cx,
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self.owner,
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self.desktop,
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[
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crate::scroll::coordinate(&args[0])?,
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crate::scroll::coordinate(&args[1])?,
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],
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matches!(self.query, Query::ScrollBy),
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)?;
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Value::Nil
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}
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Query::ScrollIntoView => {
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crate::scroll::into_view(cx, self.owner, self.desktop)?;
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Value::Nil
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}
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Query::ScrollPosition => {
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let p = mount
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.geometry
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.scroll
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.ok_or(VmError::InvalidArgument("Mount is not scrollable"))?;
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let result = cx.new_object()?;
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for (name, value) in [("x", p[0]), ("y", p[1]), ("maxX", p[2]), ("maxY", p[3])] {
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cx.set_attr(result, name, Value::Number((value as f64).into()))?;
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}
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Value::Object(result)
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}
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Query::Bounds => {
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let geometry = if let Some(layout) = &mount.layout {
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layout
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.lock()
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.map_err(|_| VmError::InvalidArgument("layout context poisoned"))?
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.bounds
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.ok_or(VmError::InvalidArgument(
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"Mount geometry is unavailable during measurement",
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))?
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} else {
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[
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mount.geometry.x,
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mount.geometry.y,
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mount.geometry.width,
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mount.geometry.height,
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]
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};
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let bounds = cx.new_object()?;
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let endor_core::CallType::Single(endor_core::AnnotationType::Nominal(definition)) =
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&self.signature.returns
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else {
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return Err(VmError::InvalidArgument("invalid Mount bounds signature"));
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};
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cx.attach_type(bounds, *definition)?;
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for (name, value) in [
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("x", geometry[0]),
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("y", geometry[1]),
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("width", geometry[2]),
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("height", geometry[3]),
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] {
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cx.set_attr(bounds, name, Value::Number((value as f64).into()))?;
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}
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cx.set_attr(
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bounds,
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"layoutVersion",
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Value::Number((mount.version as i64).into()),
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)?;
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Value::Object(bounds)
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}
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Query::Focus => {
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crate::scroll::into_view(cx, self.owner, self.desktop)?;
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if !mount.geometry.interactive {
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return Err(VmError::InvalidArgument("Mount is not focusable"));
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}
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let desktop = cx
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.upgrade(self.desktop)?
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.ok_or(VmError::InvalidArgument("Mount window has expired"))?;
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cx.set_attr(
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desktop,
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"focus",
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Value::Number((mount.geometry.id as i64).into()),
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)?;
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cx.set_attr(desktop, "focusRequested", Value::Bool(true))?;
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Value::Nil
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}
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Query::HitTest => {
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if mount.layout.is_some() {
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return Err(VmError::InvalidArgument(
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"Mount hitTest is unavailable during layout",
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));
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}
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let number = |value: &Value| -> Result<f32, VmError> {
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let Value::Number(number) = value else {
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return Err(VmError::InvalidArgument(
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"point coordinates must be numbers",
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));
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};
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let number = number
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.to_string()
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.parse::<f32>()
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.map_err(|_| VmError::InvalidArgument("invalid point coordinate"))?;
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if !number.is_finite() {
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return Err(VmError::InvalidArgument("invalid point coordinate"));
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}
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Ok(number)
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};
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Value::Bool(mount.geometry.contains(crate::geometry::Point::new(
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number(&args[0])?,
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number(&args[1])?,
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)))
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}
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query => {
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let weak = match query {
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Query::Parent => mount.parent,
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Query::FirstChild => mount.first_child,
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Query::NextSibling => mount.next_sibling,
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Query::Page => mount.page,
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_ => unreachable!(),
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};
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weak.map(|weak| cx.upgrade(weak))
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.transpose()?
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.flatten()
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.map(Value::Object)
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.unwrap_or(Value::Nil)
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}
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};
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Ok(NativeResult::Return(value))
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}
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}
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fn mount_signature(
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store: &endor_core::ObjectStore,
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desktop: ObjectRef,
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query: Query,
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) -> Result<endor_core::CallSignature, VmError> {
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use endor_core::{AnnotationType as T, CallEffect, CallSignature, CallType};
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let nominal = |name| crate::ui_bridge::desktop_type(store, name, desktop).map(T::Nominal);
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let returns = match query {
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Query::Bounds => nominal("Bounds")?.into(),
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Query::Parent | Query::FirstChild | Query::NextSibling => {
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CallType::nullable(nominal("Mount")?)
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}
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Query::Page => CallType::nullable(nominal("Page")?),
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Query::HitTest => T::Bool.into(),
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Query::ScrollPosition => T::Any.into(),
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_ => T::Unit.into(),
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};
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let effect = if matches!(
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query,
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Query::ScrollTo | Query::ScrollBy | Query::ScrollIntoView | Query::Focus
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) {
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CallEffect::Mutating
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} else {
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CallEffect::ReadOnly
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};
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let parameters = if matches!(query, Query::HitTest | Query::ScrollTo | Query::ScrollBy) {
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vec![T::Number, T::Number]
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} else {
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vec![]
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};
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let mut signature = CallSignature::exact(parameters, T::Any, effect);
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signature.returns = returns;
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Ok(signature)
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}
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#[derive(Debug, Default, Clone)]
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pub struct MountTable {
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pub active: HashMap<u64, WeakObjectRef>,
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order: Vec<u64>,
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}
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#[derive(Debug)]
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struct Sync {
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desktop: ObjectRef,
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page: Option<ObjectRef>,
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nodes: Vec<WeakObjectRef>,
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old: HashMap<u64, WeakObjectRef>,
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old_order: Vec<u64>,
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frame: Frame,
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preparing: bool,
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output: Arc<Mutex<HashMap<u64, WeakObjectRef>>>,
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}
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#[derive(Debug)]
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struct LifecycleCall {
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function: ObjectRef,
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block: ObjectRef,
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mount: ObjectRef,
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unmount: bool,
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}
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impl NativeCallable for LifecycleCall {
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fn arity(&self) -> Option<endor_core::CallArity> {
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Some(endor_core::CallArity::exact(0))
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}
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fn invoke(&self, cx: &mut NativeContext<'_>, _: &[Value]) -> Result<NativeResult, VmError> {
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if self.unmount {
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crate::tasks::cancel_owner(cx, self.mount)?;
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}
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Ok(NativeResult::Invoke {
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function: self.function,
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arguments: vec![Value::Object(self.block), Value::Object(self.mount)],
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})
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}
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}
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fn lifecycle_call(
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cx: &mut NativeContext<'_>,
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mount: ObjectRef,
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name: &'static str,
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) -> Result<ObjectRef, VmError> {
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let block = cx.store().payload::<Mount>(mount, "Mount")?.block;
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let definition = cx
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.store()
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.type_of(block)?
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.ok_or(VmError::InvalidArgument("untyped mounted Block"))?;
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let function = cx
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.store()
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.lookup_method(definition, name)?
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.ok_or(VmError::InvalidArgument("Block has no lifecycle method"))?;
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cx.allocate(ContextNativeFunction::new(
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name,
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LifecycleCall {
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function,
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block,
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mount,
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unmount: name == "onUnmount",
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},
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vec![function, block, mount],
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))
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}
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impl NativeCallable for Sync {
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fn arity(&self) -> Option<endor_core::CallArity> {
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Some(endor_core::CallArity::exact(0))
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}
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fn invoke(&self, cx: &mut NativeContext<'_>, _args: &[Value]) -> Result<NativeResult, VmError> {
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let mut blocks = HashMap::new();
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for weak in &self.nodes {
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if let Some(block) = cx.upgrade(*weak)? {
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blocks.insert(block.to_string(), block);
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}
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}
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let page = self
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.page
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.map(|page| cx.store().downgrade(page))
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.transpose()?;
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let mut objects = HashMap::new();
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let mut created = Vec::new();
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for geometry in &self.frame.mounts {
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let block = *blocks
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.get(&geometry.block_id)
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.ok_or(VmError::InvalidArgument(
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"frame references an unavailable Block",
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))?;
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let old = self
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.old
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.get(&geometry.id)
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.map(|weak| cx.upgrade(*weak))
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.transpose()?
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.flatten();
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let reusable = if let Some(old) = old {
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let mount = cx.store().payload::<Mount>(old, "Mount")?;
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(mount.mounted && mount.page == page && mount.block == block).then_some(old)
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} else {
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None
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};
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let object = if let Some(old) = reusable {
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old
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} else {
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let object = cx.allocate(Mount {
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block,
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page,
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parent: None,
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first_child: None,
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next_sibling: None,
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geometry: geometry.clone(),
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scroll_offset: [0.0, 0.0],
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version: self.frame.layout_version,
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mounted: true,
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tasks: None,
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layout: None,
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})?;
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crate::ui_bridge::attach_desktop_type(cx, object, "Mount", self.desktop)?;
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for (name, query) in [
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("bounds", Query::Bounds),
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("scrollTo", Query::ScrollTo),
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("scrollBy", Query::ScrollBy),
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("scrollPosition", Query::ScrollPosition),
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("scrollIntoView", Query::ScrollIntoView),
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("parent", Query::Parent),
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("firstChild", Query::FirstChild),
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("nextSibling", Query::NextSibling),
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("page", Query::Page),
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("requestFocus", Query::Focus),
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("hitTest", Query::HitTest),
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] {
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let function = cx.allocate(ContextNativeFunction::new(
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name,
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Method {
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signature: mount_signature(cx.store(), self.desktop, query)?,
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owner: object,
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desktop: cx.store().downgrade(self.desktop)?,
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query,
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},
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vec![object],
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))?;
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cx.set_attr(object, name, Value::Object(function))?;
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}
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cx.set_attr(object, "id", Value::Number((geometry.id as i64).into()))?;
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cx.set_attr(object, "block", Value::Object(block))?;
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created.push(object);
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object
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};
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objects.insert(geometry.id, object);
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}
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let root = cx.new_dict()?;
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for geometry in &self.frame.mounts {
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let object = objects[&geometry.id];
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let link = |id: Option<u64>| -> Result<Option<WeakObjectRef>, VmError> {
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id.map(|id| cx.store().downgrade(objects[&id])).transpose()
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};
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let mount = Mount {
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tasks: cx.store().payload::<Mount>(object, "Mount")?.tasks,
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block: blocks[&geometry.block_id],
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page,
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parent: link(geometry.parent)?,
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first_child: link(geometry.first_child)?,
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next_sibling: link(geometry.next_sibling)?,
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geometry: geometry.clone(),
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scroll_offset: if self.preparing {
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cx.store().payload::<Mount>(object, "Mount")?.scroll_offset
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} else {
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geometry.scroll.map(|s| [s[0], s[1]]).unwrap_or([0.0, 0.0])
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},
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version: self.frame.layout_version,
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mounted: true,
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layout: if self.preparing {
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Some(Arc::new(Mutex::new(crate::layout::Context::default())))
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} else {
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None
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},
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};
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let old = cx.store().payload::<Mount>(object, "Mount")?;
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if self.preparing
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|| old.layout.is_some()
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|| !old.mounted
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|| old.version != mount.version
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|| old.geometry != mount.geometry
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|| old.page != mount.page
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|| old.parent != mount.parent
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|| old.first_child != mount.first_child
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|| old.next_sibling != mount.next_sibling
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|| matches!(
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cx.store().get_attr(object, "mounted"),
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Err(VmError::AttributeNotFound(_))
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)
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{
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cx.replace_payload(object, mount)?;
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cx.set_attr(object, "mounted", Value::Bool(true))?;
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cx.set_attr(
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object,
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"layoutVersion",
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Value::Number((self.frame.layout_version as i64).into()),
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)?;
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}
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cx.dict_set(
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root,
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Value::Text(geometry.id.to_string()),
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Value::Object(object),
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)?;
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}
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let mut hooks = Vec::new();
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// Layout records are preorder; reversing guarantees children unmount
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// before their parents. A Page change creates fresh Mount contexts.
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for id in self.old_order.iter().rev() {
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let weak = self.old[id];
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if let Some(object) = cx.upgrade(weak)?
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&& objects.get(id) != Some(&object)
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{
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let mut mount = cx.store().payload::<Mount>(object, "Mount")?.clone();
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mount.mounted = false;
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mount.layout = None;
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mount.parent = None;
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mount.first_child = None;
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mount.next_sibling = None;
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cx.replace_payload(object, mount)?;
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cx.set_attr(object, "mounted", Value::Bool(false))?;
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hooks.push(lifecycle_call(cx, object, "onUnmount")?);
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}
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}
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for object in created {
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hooks.push(lifecycle_call(cx, object, "onMount")?);
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}
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let driver = if hooks.is_empty() {
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None
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} else {
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Some(crate::vm_sequence::build(
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cx,
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hooks,
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"<mount lifecycle>",
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self.desktop,
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)?)
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};
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let weak = objects
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.into_iter()
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.map(|(id, object)| Ok((id, cx.store().downgrade(object)?)))
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.collect::<Result<HashMap<_, _>, VmError>>()?;
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cx.set_attr(self.desktop, "mounts", Value::Object(root))?;
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*self
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.output
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.lock()
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.map_err(|_| VmError::InvalidArgument("Mount registry poisoned"))? = weak;
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Ok(NativeResult::Return(
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driver.map(Value::Object).unwrap_or(Value::Nil),
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|
))
|
|
}
|
|
}
|
|
|
|
/// Explicitly owned roots protect the old presentation while preparation
|
|
/// temporarily replaces its desktop dictionary and Mount payloads.
|
|
pub struct Checkpoint {
|
|
table: MountTable,
|
|
dictionary: Option<ObjectRef>,
|
|
states: Vec<(ObjectRef, Mount, Option<Value>, Option<Value>)>,
|
|
roots: Vec<ObjectRef>,
|
|
}
|
|
|
|
impl Checkpoint {
|
|
pub fn release(self, vm: &mut Vm) -> Result<(), VmError> {
|
|
let mut result = Ok(());
|
|
for root in self.roots.into_iter().rev() {
|
|
if let Err(error) = vm.release(root) {
|
|
result = Err(error);
|
|
}
|
|
}
|
|
result
|
|
}
|
|
|
|
pub fn restore(
|
|
self,
|
|
vm: &mut Vm,
|
|
desktop: ObjectRef,
|
|
table: &mut MountTable,
|
|
) -> Result<(), VmError> {
|
|
let result = (|| {
|
|
let old: std::collections::HashSet<_> =
|
|
self.states.iter().map(|state| state.0).collect();
|
|
for weak in table.ordered() {
|
|
if let Some(object) = vm.upgrade(weak)? {
|
|
let result = (|| {
|
|
if !old.contains(&object) {
|
|
let mut mount = vm.payload::<Mount>(object, "Mount")?.clone();
|
|
mount.mounted = false;
|
|
mount.layout = None;
|
|
mount.parent = None;
|
|
mount.first_child = None;
|
|
mount.next_sibling = None;
|
|
vm.replace_payload(object, mount)?;
|
|
vm.set_attr(object, "mounted", Value::Bool(false))?;
|
|
}
|
|
Ok::<_, VmError>(())
|
|
})();
|
|
vm.release(object)?;
|
|
result?;
|
|
}
|
|
}
|
|
for (object, mount, mounted, version) in &self.states {
|
|
vm.replace_payload(*object, mount.clone())?;
|
|
for (name, value) in [("mounted", mounted), ("layoutVersion", version)] {
|
|
if let Some(value) = value {
|
|
vm.set_attr(*object, name, value.clone())?;
|
|
} else {
|
|
match vm.del_attr(*object, name) {
|
|
Ok(()) | Err(VmError::AttributeNotFound(_)) => {}
|
|
Err(error) => return Err(error),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if let Some(dictionary) = self.dictionary {
|
|
vm.set_attr(desktop, "mounts", Value::Object(dictionary))?;
|
|
} else {
|
|
match vm.del_attr(desktop, "mounts") {
|
|
Ok(()) | Err(VmError::AttributeNotFound(_)) => {}
|
|
Err(error) => return Err(error),
|
|
}
|
|
}
|
|
*table = self.table.clone();
|
|
Ok(())
|
|
})();
|
|
let released = self.release(vm);
|
|
result?;
|
|
released
|
|
}
|
|
}
|
|
|
|
impl MountTable {
|
|
pub fn checkpoint(&self, vm: &mut Vm, desktop: ObjectRef) -> Result<Checkpoint, VmError> {
|
|
let dictionary = match vm.get_attr(desktop, "mounts") {
|
|
Ok(Value::Object(dictionary)) => Some(dictionary),
|
|
Err(VmError::AttributeNotFound(_)) => None,
|
|
Ok(_) => return Err(VmError::InvalidArgument("invalid mount dictionary")),
|
|
Err(error) => return Err(error),
|
|
};
|
|
let mut roots = Vec::new();
|
|
if let Some(dictionary) = dictionary {
|
|
vm.retain(dictionary)?;
|
|
roots.push(dictionary);
|
|
}
|
|
let mut checkpoint = Checkpoint {
|
|
table: self.clone(),
|
|
dictionary,
|
|
states: Vec::new(),
|
|
roots,
|
|
};
|
|
let result = (|| {
|
|
for weak in self.ordered() {
|
|
if let Some(object) = vm.upgrade(weak)? {
|
|
checkpoint.roots.push(object);
|
|
let mount = vm.payload::<Mount>(object, "Mount")?.clone();
|
|
let mut attributes = Vec::new();
|
|
for name in ["mounted", "layoutVersion"] {
|
|
let value = match vm.get_attr(object, name) {
|
|
Ok(value) => Some(value),
|
|
Err(VmError::AttributeNotFound(_)) => None,
|
|
Err(error) => return Err(error),
|
|
};
|
|
if let Some(Value::Object(object)) = &value {
|
|
vm.retain(*object)?;
|
|
checkpoint.roots.push(*object);
|
|
}
|
|
attributes.push(value);
|
|
}
|
|
checkpoint.states.push((
|
|
object,
|
|
mount,
|
|
attributes.remove(0),
|
|
attributes.remove(0),
|
|
));
|
|
}
|
|
}
|
|
Ok::<_, VmError>(())
|
|
})();
|
|
if let Err(error) = result {
|
|
checkpoint.release(vm)?;
|
|
return Err(error);
|
|
}
|
|
Ok(checkpoint)
|
|
}
|
|
|
|
/// A faulted domain cannot run user onUnmount callbacks. Still detach every
|
|
/// context and release its owning dictionary through the normal heap barrier.
|
|
pub fn retire(&mut self, vm: &mut Vm, desktop: ObjectRef) -> Result<(), VmError> {
|
|
for weak in self.ordered().into_iter().rev() {
|
|
if let Some(object) = vm.upgrade(weak)? {
|
|
let result = (|| {
|
|
let mut mount = vm.payload::<Mount>(object, "Mount")?.clone();
|
|
mount.mounted = false;
|
|
mount.layout = None;
|
|
mount.parent = None;
|
|
mount.first_child = None;
|
|
mount.next_sibling = None;
|
|
vm.replace_payload(object, mount)?;
|
|
vm.set_attr(object, "mounted", Value::Bool(false))
|
|
})();
|
|
vm.release(object)?;
|
|
result?;
|
|
}
|
|
}
|
|
let dictionary = vm.new_dict()?;
|
|
let result = vm.set_attr(desktop, "mounts", Value::Object(dictionary));
|
|
vm.release(dictionary)?;
|
|
result?;
|
|
self.active.clear();
|
|
self.order.clear();
|
|
Ok(())
|
|
}
|
|
|
|
pub fn ordered(&self) -> Vec<WeakObjectRef> {
|
|
self.order
|
|
.iter()
|
|
.filter_map(|id| self.active.get(id).copied())
|
|
.collect()
|
|
}
|
|
|
|
pub fn synchronize(
|
|
&mut self,
|
|
vm: &mut Vm,
|
|
desktop: ObjectRef,
|
|
page: Option<ObjectRef>,
|
|
nodes: Vec<WeakObjectRef>,
|
|
frame: &Frame,
|
|
preparing: bool,
|
|
) -> Result<Option<ObjectRef>, VmError> {
|
|
let output = Arc::new(Mutex::new(HashMap::new()));
|
|
let mut captures = vec![desktop];
|
|
captures.extend(page);
|
|
let function = vm.allocate(ContextNativeFunction::new(
|
|
"mount-sync",
|
|
Sync {
|
|
desktop,
|
|
page,
|
|
nodes,
|
|
old: self.active.clone(),
|
|
old_order: self.order.clone(),
|
|
frame: frame.clone(),
|
|
preparing,
|
|
output: output.clone(),
|
|
},
|
|
captures,
|
|
))?;
|
|
let result = vm.call(function, &[]);
|
|
vm.release(function)?;
|
|
let result = result?;
|
|
self.active = std::mem::take(
|
|
&mut *output
|
|
.lock()
|
|
.map_err(|_| VmError::InvalidArgument("Mount registry poisoned"))?,
|
|
);
|
|
self.order = frame.mounts.iter().map(|mount| mount.id).collect();
|
|
match result {
|
|
Value::Object(hooks) => Ok(Some(hooks)),
|
|
Value::Nil => Ok(None),
|
|
value => {
|
|
vm.release_value(value)?;
|
|
Err(VmError::InvalidArgument("invalid lifecycle batch"))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub use crate::object_list::collection;
|