Relation setter contexts

src/directed_context/dynamic_wrapper.rs

@@ -6,6 +6,7 @@ use crate::base_context::{
 use crate::directed_context::context::{
     DirectedBinaryTreeChildrenGetterContext, DirectedBinaryTreeChildrenSetterContext,
 };
+use crate::relation_context::{BinaryTreeRelationSetterContext, BinaryTreeRootRelationSetterContext, DirectedBinaryTreeRelationSetterContext};
 
 pub struct DynamicDirectedBinaryTreeContextFromContext<CtxRef> {
     ctx: CtxRef,
@@ -159,3 +160,65 @@ unsafe impl<Ctx: BinaryTreeParentSetterContext> BinaryTreeParentSetterContext
         self.ctx.clearParent(node)
     }
 }
+
+unsafe impl<Ctx: BinaryTreeRootRelationSetterContext> BinaryTreeRootRelationSetterContext
+for DynamicDirectedBinaryTreeContextFromContext<&mut Ctx>
+{
+    fn xSetRootRelation(&mut self, newRoot: Option<Self::NodeRef>) {
+        self.ctx.xSetRootRelation(newRoot)
+    }
+
+    fn setRootRelation(&mut self, newRoot: Self::NodeRef) {
+        self.ctx.setRootRelation(newRoot)
+    }
+
+    fn clearRoot(&mut self) {
+        self.ctx.clearRoot()
+    }
+}
+
+unsafe impl<Ctx: BinaryTreeRelationSetterContext> DirectedBinaryTreeRelationSetterContext
+for DynamicDirectedBinaryTreeContextFromContext<&mut Ctx>
+{
+    fn xSetForwardRelation(&mut self, node: Self::NodeRef, newChild: Option<Self::NodeRef>) {
+        match self.dir {
+            BinaryTreeDirection::LEFT => self.ctx.xSetLeftRelation(node, newChild),
+            BinaryTreeDirection::RIGHT => self.ctx.xSetRightRelation(node, newChild),
+        }
+    }
+
+    fn setForwardRelation(&mut self, node: Self::NodeRef, newChild: Self::NodeRef) {
+        match self.dir {
+            BinaryTreeDirection::LEFT => self.ctx.setLeftRelation(node, newChild),
+            BinaryTreeDirection::RIGHT => self.ctx.setRightRelation(node, newChild),
+        }
+    }
+
+    fn clearForwardChild(&mut self, node: Self::NodeRef) {
+        match self.dir {
+            BinaryTreeDirection::LEFT => self.ctx.clearLeftChild(node),
+            BinaryTreeDirection::RIGHT => self.ctx.clearRightChild(node),
+        }
+    }
+
+    fn xSetOppositeRelation(&mut self, node: Self::NodeRef, newChild: Option<Self::NodeRef>) {
+        match self.dir {
+            BinaryTreeDirection::LEFT => self.ctx.xSetRightRelation(node, newChild),
+            BinaryTreeDirection::RIGHT => self.ctx.xSetLeftRelation(node, newChild),
+        }
+    }
+
+    fn setOppositeRelation(&mut self, node: Self::NodeRef, newChild: Self::NodeRef) {
+        match self.dir {
+            BinaryTreeDirection::LEFT => self.ctx.setRightRelation(node, newChild),
+            BinaryTreeDirection::RIGHT => self.ctx.setLeftRelation(node, newChild),
+        }
+    }
+
+    fn clearOppositeChild(&mut self, node: Self::NodeRef) {
+        match self.dir {
+            BinaryTreeDirection::LEFT => self.ctx.clearRightChild(node),
+            BinaryTreeDirection::RIGHT => self.ctx.clearLeftChild(node),
+        }
+    }
+}

src/directed_context/fixed_wrapper.rs

@@ -3,9 +3,13 @@ use crate::base_context::{
     BinaryTreeChildrenGetterContext, BinaryTreeChildrenSetterContext,
     BinaryTreeParentGetterContext, BinaryTreeParentSetterContext,
 };
-use crate::directed_context::context::{
+use crate::directed_context::{
     DirectedBinaryTreeChildrenGetterContext, DirectedBinaryTreeChildrenSetterContext,
 };
+use crate::relation_context::{
+    BinaryTreeRelationSetterContext, BinaryTreeRootRelationSetterContext,
+    DirectedBinaryTreeRelationSetterContext,
+};
 
 macro_rules! _mut_switch {
     ($macro:tt $excl_mark:tt ( $($args:tt)+) ) => {
@@ -85,8 +89,12 @@ macro_rules! _children_get {
     };
 }
 
-_mut_switch!(_children_get!(FixedLeftDirectedBinaryTreeContextFromContext getLeftChild getRightChild));
-_mut_switch!(_children_get!(FixedRightDirectedBinaryTreeContextFromContext getRightChild getLeftChild));
+_mut_switch!(_children_get!(
+    FixedLeftDirectedBinaryTreeContextFromContext getLeftChild getRightChild
+));
+_mut_switch!(_children_get!(
+    FixedRightDirectedBinaryTreeContextFromContext getRightChild getLeftChild
+));
 
 macro_rules! _parent_set {
     ($name:ident) => {
@@ -155,3 +163,79 @@ _children_set!(
     xSetRightChild setRightChild clearRightChild
     xSetLeftChild setLeftChild clearLeftChild
 );
+
+macro_rules! _root_relation_set {
+    ($name:ident) => {
+        unsafe impl<Ctx: BinaryTreeRootRelationSetterContext> BinaryTreeRootRelationSetterContext
+            for $name<&mut Ctx>
+        {
+            fn xSetRootRelation(&mut self, newRoot: Option<Self::NodeRef>) {
+                self.ctx.xSetRootRelation(newRoot)
+            }
+
+            fn setRootRelation(&mut self, newRoot: Self::NodeRef) {
+                self.ctx.setRootRelation(newRoot)
+            }
+
+            fn clearRoot(&mut self) {
+                self.ctx.clearRoot()
+            }
+        }
+    };
+}
+_root_relation_set!(FixedLeftDirectedBinaryTreeContextFromContext);
+_root_relation_set!(FixedRightDirectedBinaryTreeContextFromContext);
+
+macro_rules! _relation_set {
+    (
+        $name:ident
+        $fwd_xset:ident $fwd_set:ident $fwd_clear:ident
+        $op_xset:ident $op_set:ident $op_clear:ident
+    ) => {
+        unsafe impl<Ctx: BinaryTreeRelationSetterContext> DirectedBinaryTreeRelationSetterContext
+            for $name<&mut Ctx>
+        {
+            fn xSetForwardRelation(
+                &mut self,
+                node: Self::NodeRef,
+                newChild: Option<Self::NodeRef>,
+            ) {
+                self.ctx.$fwd_xset(node, newChild)
+            }
+
+            fn xSetOppositeRelation(
+                &mut self,
+                node: Self::NodeRef,
+                newChild: Option<Self::NodeRef>,
+            ) {
+                self.ctx.$op_xset(node, newChild)
+            }
+
+            fn setForwardRelation(&mut self, node: Self::NodeRef, newChild: Self::NodeRef) {
+                self.ctx.$fwd_set(node, newChild)
+            }
+
+            fn setOppositeRelation(&mut self, node: Self::NodeRef, newChild: Self::NodeRef) {
+                self.ctx.$op_set(node, newChild)
+            }
+
+            fn clearForwardChild(&mut self, node: Self::NodeRef) {
+                self.ctx.$fwd_clear(node)
+            }
+
+            fn clearOppositeChild(&mut self, node: Self::NodeRef) {
+                self.ctx.$op_clear(node)
+            }
+        }
+    };
+}
+_relation_set!(
+    FixedLeftDirectedBinaryTreeContextFromContext
+    xSetLeftRelation setLeftRelation clearLeftChild
+    xSetRightRelation setRightRelation clearRightChild
+);
+_relation_set!(
+    FixedRightDirectedBinaryTreeContextFromContext
+    xSetRightRelation setRightRelation clearRightChild
+    xSetLeftRelation setLeftRelation clearLeftChild
+);

src/lib.rs

@@ -5,3 +5,4 @@ pub mod algo;
 pub mod base_context;
 pub mod directed_context;
 pub mod parent2node_clojure;
+pub mod relation_context;

src/parent2node_clojure/dynamic_wrappers.rs

@@ -9,6 +9,10 @@ use crate::directed_context::{
     DirectedBinaryTreeDirection,
 };
 use crate::parent2node_clojure::clojure::Parent2NodeGetterClojure;
+use crate::relation_context::{
+    BinaryTreeRelationSetterContext, BinaryTreeRootRelationSetterContext,
+    DirectedBinaryTreeRelationSetterContext, Parent2NodeRelationSetterClojure,
+};
 use std::mem::ManuallyDrop;
 use std::ops::Deref;
 
@@ -85,10 +89,12 @@ macro_rules! _constructor {
     };
 }
 
-_mut_switch!(_constructor!(DynamicParent2NodeGetterClojureFromContext BinaryTreeDirection));
-_mut_switch!(
-    _constructor!(DynamicParent2NodeGetterClojureFromDirectedContext DirectedBinaryTreeDirection)
-);
+_mut_switch!(_constructor!(
+    DynamicParent2NodeGetterClojureFromContext BinaryTreeDirection
+));
+_mut_switch!(_constructor!(
+    DynamicParent2NodeGetterClojureFromDirectedContext DirectedBinaryTreeDirection
+));
 
 macro_rules! _node_ref {
     ($name:ident $($mut:tt)?) => {
@@ -98,7 +104,9 @@ macro_rules! _node_ref {
     };
 }
 
-_mut_switch!(_node_ref!(DynamicParent2NodeGetterClojureFromContext));
+_mut_switch!(_node_ref!(
+    DynamicParent2NodeGetterClojureFromContext
+));
 _mut_switch!(_node_ref!(
     DynamicParent2NodeGetterClojureFromDirectedContext
 ));
@@ -233,6 +241,71 @@ _set_as_parent_of!(
     DirectedBinaryTreeDirection FORWARD OPPOSITE
 );
 
+macro_rules! _set_relation {
+    (
+        $name:ident $ctx_constraint:ident $dir_enum_lbl:ident
+        $d1_lbl:ident $d1_xset:ident $d1_set:ident $d1_clear:ident
+        $d2_lbl:ident $d2_xset:ident $d2_set:ident $d2_clear:ident
+    ) => {
+        unsafe impl<'ctx, Ctx: BinaryTreeRootRelationSetterContext + $ctx_constraint>
+            Parent2NodeRelationSetterClojure for $name<&'ctx mut Ctx, Ctx::NodeRef>
+        {
+            fn xSetRelation(&mut self, newChild: Option<Self::NodeRef>) {
+                match self.dir {
+                    None => self.ctx.xSetRootRelation(newChild),
+                    Some($dir_enum_lbl::$d1_lbl) => unsafe {
+                        self.ctx
+                            .$d1_xset((*self.node.node.deref()).clone(), newChild)
+                    },
+                    Some($dir_enum_lbl::$d2_lbl) => unsafe {
+                        self.ctx
+                            .$d2_xset((*self.node.node.deref()).clone(), newChild)
+                    },
+                };
+            }
+
+            fn setRelation(&mut self, newChild: Self::NodeRef) {
+                match self.dir {
+                    None => self.ctx.setRootRelation(newChild),
+                    Some($dir_enum_lbl::$d1_lbl) => unsafe {
+                        self.ctx
+                            .$d1_set((*self.node.node.deref()).clone(), newChild)
+                    },
+                    Some($dir_enum_lbl::$d2_lbl) => unsafe {
+                        self.ctx
+                            .$d2_set((*self.node.node.deref()).clone(), newChild)
+                    },
+                };
+            }
+
+            fn clearChild(&mut self) {
+                match self.dir {
+                    None => self.ctx.clearRoot(),
+                    Some($dir_enum_lbl::$d1_lbl) => unsafe {
+                        self.ctx.$d1_clear((*self.node.node.deref()).clone())
+                    },
+                    Some($dir_enum_lbl::$d2_lbl) => unsafe {
+                        self.ctx.$d2_clear((*self.node.node.deref()).clone())
+                    },
+                };
+            }
+        }
+    };
+}
+
+_set_relation!(
+    DynamicParent2NodeGetterClojureFromContext
+    BinaryTreeRelationSetterContext BinaryTreeDirection
+    LEFT xSetLeftRelation setLeftRelation clearLeftChild
+    RIGHT xSetRightRelation setRightRelation clearRightChild
+);
+_set_relation!(
+    DynamicParent2NodeGetterClojureFromDirectedContext
+    DirectedBinaryTreeRelationSetterContext DirectedBinaryTreeDirection
+    FORWARD xSetForwardRelation setForwardRelation clearForwardChild
+    OPPOSITE xSetOppositeRelation setOppositeRelation clearOppositeChild
+);
+
 macro_rules! _drop {
     ($name:ident $($mut:tt)?) => {
         impl<CtxRef, NodeRef> Drop for $name<CtxRef, NodeRef> {

src/parent2node_clojure/fixed_wrapper.rs

@@ -9,6 +9,7 @@ use crate::directed_context::{
 use crate::parent2node_clojure::clojure::{
     Parent2NodeGetterClojure, Parent2NodeSetterClojure, ParentProviderClojure,
 };
+use crate::relation_context::{BinaryTreeRootRelationSetterContext, Parent2NodeRelationSetterClojure};
 
 macro_rules! _mut_switch {
     ($macro:tt $excl_mark:tt ( $($args:tt)+) ) => {
@@ -224,3 +225,61 @@ _set_as_parent_of!(FixedLeftParent2NodeGetterClojureFromContext);
 _set_as_parent_of!(FixedRightParent2NodeGetterClojureFromContext);
 _set_as_parent_of!(FixedForwardParent2NodeGetterClojureFromDirectedContext);
 _set_as_parent_of!(FixedOppositeParent2NodeGetterClojureFromDirectedContext);
+
+macro_rules! _relation_setter {
+    ($name:ident $ctx:ident $xset:ident $set:ident $clear:ident) => {
+        unsafe impl<'ctx, Ctx: $ctx> Parent2NodeRelationSetterClojure
+            for $name<&'ctx mut Ctx, Ctx::NodeRef>
+        {
+            fn xSetRelation(&mut self, newChild: Option<Self::NodeRef>) {
+                self.ctx.$xset(self.node.clone(), newChild);
+            }
+
+            fn setRelation(&mut self, newChild: Self::NodeRef) {
+                self.ctx.$set(self.node.clone(), newChild);
+            }
+
+            fn clearChild(&mut self) {
+                self.ctx.$clear(self.node.clone());
+            }
+        }
+    };
+}
+
+unsafe impl<'ctx, Ctx: BinaryTreeRootRelationSetterContext>
+    Parent2NodeRelationSetterClojure
+    for FixedRootParent2NodeGetterClojureFromContext<&'ctx mut Ctx>
+{
+    fn xSetRelation(&mut self, newChild: Option<Self::NodeRef>) {
+        self.ctx.xSetRootRelation(newChild);
+    }
+
+    fn setRelation(&mut self, newChild: Self::NodeRef) {
+        self.ctx.setRootRelation(newChild);
+    }
+
+    fn clearChild(&mut self) {
+        self.ctx.clearRoot()
+    }
+}
+
+_relation_setter!(
+    FixedLeftParent2NodeGetterClojureFromContext
+    BinaryTreeChildrenSetterContext
+    xSetLeftChild setLeftChild clearLeftChild
+);
+_relation_setter!(
+    FixedRightParent2NodeGetterClojureFromContext
+    BinaryTreeChildrenSetterContext
+    xSetRightChild setRightChild clearRightChild
+);
+_relation_setter!(
+    FixedForwardParent2NodeGetterClojureFromDirectedContext
+    DirectedBinaryTreeChildrenSetterContext
+    xSetForwardChild setForwardChild clearForwardChild
+);
+_relation_setter!(
+    FixedOppositeParent2NodeGetterClojureFromDirectedContext
+    DirectedBinaryTreeChildrenSetterContext
+    xSetOppositeChild setOppositeChild clearOppositeChild
+);

src/relation_context/context.rs

@@ -0,0 +1,65 @@
+use crate::NodeRefContainer;
+
+pub unsafe trait BinaryTreeRootRelationSetterContext: NodeRefContainer {
+    fn xSetRootRelation(&mut self, newRoot: Option<Self::NodeRef>) {
+        match newRoot {
+            None => self.clearRoot(),
+            Some(nn) => self.setRootRelation(nn),
+        }
+    }
+    fn setRootRelation(&mut self, newRoot: Self::NodeRef);
+    fn clearRoot(&mut self);
+}
+
+pub unsafe trait BinaryTreeRelationSetterContext: NodeRefContainer {
+    fn xSetLeftRelation(&mut self, parent: Self::NodeRef, child: Option<Self::NodeRef>) {
+        match child {
+            None => self.clearLeftChild(parent),
+            Some(nn) => self.setLeftRelation(parent, nn),
+        }
+    }
+    fn setLeftRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef);
+    fn clearLeftChild(&mut self, parent: Self::NodeRef);
+
+    fn xSetRightRelation(&mut self, parent: Self::NodeRef, child: Option<Self::NodeRef>){
+        match child {
+            None => self.clearRightChild(parent),
+            Some(nn) => self.setRightRelation(parent, nn),
+        }
+    }
+    fn setRightRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef);
+    fn clearRightChild(&mut self, parent: Self::NodeRef);
+}
+
+pub unsafe trait DirectedBinaryTreeRelationSetterContext: NodeRefContainer {
+    fn xSetForwardRelation(&mut self, parent: Self::NodeRef, child: Option<Self::NodeRef>){
+        match child {
+            None => self.clearForwardChild(parent),
+            Some(nn) => self.setForwardRelation(parent, nn),
+        }
+    }
+    fn setForwardRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef);
+    fn clearForwardChild(&mut self, parent: Self::NodeRef);
+
+    fn xSetOppositeRelation(&mut self, parent: Self::NodeRef, child: Option<Self::NodeRef>){
+        match child {
+            None => self.clearOppositeChild(parent),
+            Some(nn) => self.setOppositeRelation(parent, nn),
+        }
+    }
+    fn setOppositeRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef);
+    fn clearOppositeChild(&mut self, parent: Self::NodeRef);
+}
+
+pub unsafe trait Parent2NodeRelationSetterClojure: NodeRefContainer {
+    fn xSetRelation(&mut self, newChild: Option<Self::NodeRef>) {
+        match newChild {
+            None => self.clearChild(),
+            Some(nn) => self.setRelation(nn),
+        }
+    }
+
+    fn setRelation(&mut self, newChild: Self::NodeRef);
+
+    fn clearChild(&mut self);
+}

src/relation_context/converter.rs

@@ -0,0 +1,171 @@
+use crate::NodeRefContainer;
+use crate::base_context::{BinaryTreeChildrenGetterContext, BinaryTreeChildrenSetterContext, BinaryTreeParentGetterContext, BinaryTreeParentSetterContext, BinaryTreeRootSetter};
+use crate::directed_context::{DirectedBinaryTreeChildrenGetterContext, DirectedBinaryTreeChildrenSetterContext};
+use crate::relation_context::{
+    BinaryTreeRelationSetterContext, BinaryTreeRootRelationSetterContext,
+    DirectedBinaryTreeRelationSetterContext,
+};
+
+macro_rules! _mut_switch {
+    ($macro:tt $excl_mark:tt ( $($args:tt)+) ) => {
+        $macro$excl_mark($($args)+);
+        $macro$excl_mark($($args)+ mut);
+    };
+}
+
+pub struct BinaryTreeRelationContextFromBaseContextConverter<CtxRef> {
+    ctx: CtxRef,
+}
+
+pub struct DirectedBinaryTreeRelationContextFromBaseContextConverter<CtxRef> {
+    ctx: CtxRef,
+}
+
+macro_rules! _constructor {
+    ($name:ident) => {
+        impl<'ctx, Ctx: NodeRefContainer> $name<&'ctx Ctx> {
+            pub fn wrap(ctx: &'ctx Ctx) -> Self {
+                return Self { ctx };
+            }
+        }
+    };
+
+    ($name:ident mut) => {
+        impl<'ctx, Ctx: NodeRefContainer> $name<&'ctx mut Ctx> {
+            pub fn wrap_mut(ctx: &'ctx mut Ctx) -> Self {
+                return Self { ctx };
+            }
+        }
+    };
+}
+
+_mut_switch!(_constructor!(
+    BinaryTreeRelationContextFromBaseContextConverter
+));
+_mut_switch!(_constructor!(
+    DirectedBinaryTreeRelationContextFromBaseContextConverter
+));
+
+macro_rules! _node_ref {
+    ($name:ident $($mut:tt)?) => {
+        impl<Ctx: NodeRefContainer> NodeRefContainer for $name<& $($mut)? Ctx> {
+            type NodeRef = Ctx::NodeRef;
+        }
+    };
+}
+
+_mut_switch!(_node_ref!(
+    BinaryTreeRelationContextFromBaseContextConverter
+));
+_mut_switch!(_node_ref!(
+    DirectedBinaryTreeRelationContextFromBaseContextConverter
+));
+
+macro_rules! _parent_get {
+    ($name:ident $($mut:tt)?) => {
+        impl<Ctx: BinaryTreeParentGetterContext> BinaryTreeParentGetterContext
+            for $name<& $($mut)? Ctx>
+        {
+            fn getParent(&self, node: Self::NodeRef) -> Option<Self::NodeRef> {
+                return self.ctx.getParent(node);
+            }
+        }
+    };
+}
+
+_mut_switch!(_parent_get!(
+    BinaryTreeRelationContextFromBaseContextConverter
+));
+_mut_switch!(_parent_get!(
+    DirectedBinaryTreeRelationContextFromBaseContextConverter
+));
+
+macro_rules! _children_get {
+    ($name:ident $ctx:ident $d1:ident $d2:ident $($mut:tt)? ) => {
+        impl<Ctx: $ctx> $ctx
+            for $name <& $($mut)? Ctx>
+        {
+            fn $d1(&self, node: Self::NodeRef) -> Option<Self::NodeRef> {
+                return self.ctx.$d1(node);
+            }
+
+            fn $d2(&self, node: Self::NodeRef) -> Option<Self::NodeRef> {
+                return self.ctx.$d2(node);
+            }
+        }
+    };
+}
+
+_mut_switch!(_children_get!(
+    BinaryTreeRelationContextFromBaseContextConverter
+    BinaryTreeChildrenGetterContext getLeftChild getRightChild
+));
+_mut_switch!(_children_get!(
+    DirectedBinaryTreeRelationContextFromBaseContextConverter
+    DirectedBinaryTreeChildrenGetterContext getForwardChild getOppositeChild
+));
+
+macro_rules! _root_relation_set {
+    ($name:ident) => {
+        unsafe impl<Ctx: BinaryTreeParentSetterContext + BinaryTreeRootSetter>
+            BinaryTreeRootRelationSetterContext for $name<&mut Ctx>
+        {
+            fn setRootRelation(&mut self, newRoot: Self::NodeRef) {
+                self.ctx.setRoot(newRoot.clone());
+                self.ctx.clearParent(newRoot)
+            }
+
+            fn clearRoot(&mut self) {
+                self.ctx.clearRoot()
+            }
+        }
+    };
+}
+_root_relation_set!(BinaryTreeRelationContextFromBaseContextConverter);
+_root_relation_set!(DirectedBinaryTreeRelationContextFromBaseContextConverter);
+
+unsafe impl<Ctx: BinaryTreeParentSetterContext + BinaryTreeChildrenSetterContext>
+    BinaryTreeRelationSetterContext
+    for BinaryTreeRelationContextFromBaseContextConverter<&mut Ctx>
+{
+    fn setLeftRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef) {
+        self.ctx.setParent(child.clone(), parent.clone());
+        self.ctx.setLeftChild(parent, child)
+    }
+
+    fn clearLeftChild(&mut self, parent: Self::NodeRef) {
+        self.ctx.clearLeftChild(parent)
+    }
+
+    fn setRightRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef) {
+        self.ctx.setParent(child.clone(), parent.clone());
+        self.ctx.setRightChild(parent, child)
+    }
+
+    fn clearRightChild(&mut self, parent: Self::NodeRef) {
+        self.ctx.clearRightChild(parent);
+    }
+}
+
+unsafe impl<Ctx: BinaryTreeParentSetterContext + DirectedBinaryTreeChildrenSetterContext>
+    DirectedBinaryTreeRelationSetterContext
+    for DirectedBinaryTreeRelationContextFromBaseContextConverter<&mut Ctx>
+{
+    fn setForwardRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef) {
+        self.ctx.setParent(child.clone(), parent.clone());
+        self.ctx.setForwardChild(parent, child)
+    }
+
+    fn clearForwardChild(&mut self, parent: Self::NodeRef) {
+        self.ctx.clearForwardChild(parent)
+    }
+
+    fn setOppositeRelation(&mut self, parent: Self::NodeRef, child: Self::NodeRef) {
+        self.ctx.setParent(child.clone(), parent.clone());
+        self.ctx.setOppositeChild(parent, child)
+    }
+
+    fn clearOppositeChild(&mut self, parent: Self::NodeRef) {
+        self.ctx.clearOppositeChild(parent);
+    }
+}

src/relation_context/mod.rs

@@ -0,0 +1,5 @@
+mod context;
+mod converter;
+
+pub use context::*;
+pub use converter::*;