Add ReplaceCurve

Provide an initial implementation for `HalfEdge`. Other implementations
will be provided, once the building blocks for them are in place.

crates/fj-core/src/operations/replace/curve.rs

@@ -0,0 +1,215 @@
+use crate::{
+    objects::{Curve, Cycle, Face, HalfEdge, Region, Shell, Sketch, Solid},
+    operations::{insert::Insert, update::UpdateHalfEdge},
+    services::Services,
+    storage::Handle,
+};
+
+use super::ReplaceOutput;
+
+/// Replace a [`Curve`] in the referenced object graph
+///
+/// See [module documentation] for more information.
+///
+/// [module documentation]: super
+pub trait ReplaceCurve: Sized {
+    /// Replace the curve
+    #[must_use]
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self>;
+}
+
+impl ReplaceCurve for Handle<HalfEdge> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        if original.id() == self.curve().id() {
+            ReplaceOutput::Updated(
+                self.update_curve(|_| replacement).insert(services),
+            )
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}
+
+impl ReplaceCurve for Handle<Cycle> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        let mut replacement_happened = false;
+
+        let mut half_edges = Vec::new();
+        for half_edge in self.half_edges() {
+            let half_edge = half_edge.clone().replace_curve(
+                original,
+                replacement.clone(),
+                services,
+            );
+            replacement_happened |= half_edge.was_updated();
+            half_edges.push(half_edge.into_inner());
+        }
+
+        if replacement_happened {
+            ReplaceOutput::Updated(Cycle::new(half_edges).insert(services))
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}
+
+impl ReplaceCurve for Handle<Region> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        let mut replacement_happened = false;
+
+        let exterior = self.exterior().clone().replace_curve(
+            original,
+            replacement.clone(),
+            services,
+        );
+        replacement_happened |= exterior.was_updated();
+
+        let mut interiors = Vec::new();
+        for cycle in self.interiors() {
+            let cycle = cycle.clone().replace_curve(
+                original,
+                replacement.clone(),
+                services,
+            );
+            replacement_happened |= cycle.was_updated();
+            interiors.push(cycle.into_inner());
+        }
+
+        if replacement_happened {
+            ReplaceOutput::Updated(
+                Region::new(exterior.into_inner(), interiors, self.color())
+                    .insert(services),
+            )
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}
+
+impl ReplaceCurve for Handle<Sketch> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        let mut replacement_happened = false;
+
+        let mut regions = Vec::new();
+        for region in self.regions() {
+            let region = region.clone().replace_curve(
+                original,
+                replacement.clone(),
+                services,
+            );
+            replacement_happened |= region.was_updated();
+            regions.push(region.into_inner());
+        }
+
+        if replacement_happened {
+            ReplaceOutput::Updated(Sketch::new(regions).insert(services))
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}
+
+impl ReplaceCurve for Handle<Face> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        let region = self.region().clone().replace_curve(
+            original,
+            replacement,
+            services,
+        );
+
+        if region.was_updated() {
+            ReplaceOutput::Updated(
+                Face::new(self.surface().clone(), region.into_inner())
+                    .insert(services),
+            )
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}
+
+impl ReplaceCurve for Handle<Shell> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        let mut replacement_happened = false;
+
+        let mut faces = Vec::new();
+        for face in self.faces() {
+            let face = face.clone().replace_curve(
+                original,
+                replacement.clone(),
+                services,
+            );
+            replacement_happened |= face.was_updated();
+            faces.push(face.into_inner());
+        }
+
+        if replacement_happened {
+            ReplaceOutput::Updated(Shell::new(faces).insert(services))
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}
+
+impl ReplaceCurve for Handle<Solid> {
+    fn replace_curve(
+        self,
+        original: &Handle<Curve>,
+        replacement: Handle<Curve>,
+        services: &mut Services,
+    ) -> ReplaceOutput<Self> {
+        let mut replacement_happened = false;
+
+        let mut shells = Vec::new();
+        for shell in self.shells() {
+            let shell = shell.clone().replace_curve(
+                original,
+                replacement.clone(),
+                services,
+            );
+            replacement_happened |= shell.was_updated();
+            shells.push(shell.into_inner());
+        }
+
+        if replacement_happened {
+            ReplaceOutput::Updated(Solid::new(shells).insert(services))
+        } else {
+            ReplaceOutput::Original(self)
+        }
+    }
+}

crates/fj-core/src/operations/replace/mod.rs

@@ -79,9 +79,10 @@
 //! [`Handle`]: crate::storage::Handle
 //! [update operations]: crate::operations::update
 
+mod curve;
 mod vertex;
 
-pub use self::vertex::ReplaceVertex;
+pub use self::{curve::ReplaceCurve, vertex::ReplaceVertex};
 
 /// The output of a replace operation
 ///