get nested geomtry structure working for highlighting

src/App.tsx

@@ -4,7 +4,7 @@ import { Allotment } from 'allotment'
 import { OrbitControls, OrthographicCamera } from '@react-three/drei'
 import { lexer } from './lang/tokeniser'
 import { abstractSyntaxTree } from './lang/abstractSyntaxTree'
-import { executor } from './lang/executor'
+import { executor, processShownObjects, ViewerArtifact } from './lang/executor'
 import { recast } from './lang/recast'
 import { BufferGeometry } from 'three'
 import CodeMirror from '@uiw/react-codemirror'
@@ -74,9 +74,7 @@ function App() {
     if (isNoChange) return
     setSelectionRange([range.from, range.to])
   }
-  const [geoArray, setGeoArray] = useState<
-    { geo: BufferGeometry; sourceRange: [number, number] }[]
-  >([])
+  const [geoArray, setGeoArray] = useState<ViewerArtifact[]>([])
   useEffect(() => {
     try {
       if (!code) {
@@ -91,25 +89,23 @@ function App() {
       const programMemory = executor(_ast, {
         root: {
           log: (a: any) => {
-            addLog(a)
+            let b = a
+            if (Array.isArray(a)) {
+              b = a.map(({ geo, ...rest }) => rest)
+              b = JSON.stringify(b, null, 2)
+            } else if (typeof a === 'object') {
+              b = JSON.stringify(a, null, 2)
+            }
+            addLog(b)
           },
         },
         _sketch: [],
       })
-      const geos: { geo: BufferGeometry; sourceRange: [number, number] }[] =
+      const geos: ViewerArtifact[] =
         programMemory?.return?.flatMap(
           ({ name }: { name: string }) =>
-            programMemory?.root?.[name]
-              ?.map(
-                ({
-                  geo,
-                  sourceRange,
-                }: {
-                  geo: BufferGeometry
-                  sourceRange: [number, number]
-                }) => ({ geo, sourceRange })
-              )
-              .filter((a: any) => !!a.geo) || []
+            processShownObjects(programMemory)(programMemory?.root?.[name]) ||
+            []
         ) || []
       setGeoArray(geos)
       removeError()
@@ -169,17 +165,9 @@ function App() {
                 />
                 <ambientLight />
                 <pointLight position={[10, 10, 10]} />
-                {geoArray.map(
-                  (
-                    {
-                      geo,
-                      sourceRange,
-                    }: { geo: BufferGeometry; sourceRange: [number, number] },
-                    index
-                  ) => (
-                    <Line key={index} geo={geo} sourceRange={sourceRange} />
-                  )
-                )}
+                {geoArray.map((artifact, index) => (
+                  <RenderViewerArtifacts artifact={artifact} key={index} />
+                ))}
                 <BasePlanes />
                 <SketchPlane />
                 <AxisIndicator />
@@ -207,9 +195,11 @@ export default App
 function Line({
   geo,
   sourceRange,
+  forceHighlight = false,
 }: {
   geo: BufferGeometry
   sourceRange: [number, number]
+  forceHighlight?: boolean
 }) {
   const { setHighlightRange, selectionRange } = useStore(
     ({ setHighlightRange, selectionRange }) => ({
@@ -240,8 +230,52 @@ function Line({
     >
       <primitive object={geo} />
       <meshStandardMaterial
-        color={hovered ? 'hotpink' : editorCursor ? 'skyblue' : 'orange'}
+        color={
+          hovered
+            ? 'hotpink'
+            : editorCursor || forceHighlight
+            ? 'skyblue'
+            : 'orange'
+        }
       />
     </mesh>
   )
 }
+
+function RenderViewerArtifacts({
+  artifact,
+  forceHighlight = false,
+}: {
+  artifact: ViewerArtifact
+  forceHighlight?: boolean
+}) {
+  const { selectionRange } = useStore(({ selectionRange }) => ({
+    selectionRange,
+  }))
+  const [editorCursor, setEditorCursor] = useState(false)
+  useEffect(() => {
+    const shouldHighlight = isOverlapping(artifact.sourceRange, selectionRange)
+    setEditorCursor(shouldHighlight)
+  }, [selectionRange, artifact.sourceRange])
+  if (artifact.type === 'geo') {
+    const { geo, sourceRange } = artifact
+    return (
+      <Line
+        geo={geo}
+        sourceRange={sourceRange}
+        forceHighlight={forceHighlight}
+      />
+    )
+  }
+  return (
+    <>
+      {artifact.children.map((artifact, index) => (
+        <RenderViewerArtifacts
+          artifact={artifact}
+          key={index}
+          forceHighlight={editorCursor}
+        />
+      ))}
+    </>
+  )
+}

src/lang/executor.ts

@@ -1,5 +1,6 @@
 import { Program, BinaryPart, BinaryExpression } from './abstractSyntaxTree'
-import { Path, sketchFns } from './sketch'
+import { Path, Transform, sketchFns } from './sketch'
+import { BufferGeometry } from 'three'
 
 export interface ProgramMemory {
   root: { [key: string]: any }
@@ -100,6 +101,17 @@ export const executor = (
             )
             _programMemory._sketch = result.programMemory._sketch
             _programMemory.root[variableName] = result.currentPath
+          } else if ('rx' === fnName) {
+            if (declaration.init.arguments[1].type !== 'Identifier')
+              throw new Error('rx must be called with an identifier')
+            const id = declaration.init.arguments[1].name
+            const result = sketchFns[fnName](
+              _programMemory,
+              [declaration.start, declaration.end],
+              fnArgs[0],
+              id
+            )
+            _programMemory.root[variableName] = result
           } else {
             _programMemory.root[variableName] = _programMemory.root[fnName](
               ...fnArgs
@@ -171,3 +183,60 @@ function getBinaryExpressionResult(
   const right = getVal(expression.right)
   return left + right
 }
+
+type SourceRange = [number, number]
+
+export type ViewerArtifact =
+  | {
+      type: 'geo'
+      sourceRange: SourceRange
+      geo: BufferGeometry
+    }
+  | {
+      type: 'parent'
+      sourceRange: SourceRange
+      children: ViewerArtifact[]
+    }
+
+export const processShownObjects =
+  (programMemory: ProgramMemory) =>
+  (geoMeta: Path[] | Transform): ViewerArtifact[] => {
+    if (Array.isArray(geoMeta)) {
+      return geoMeta.map(({ geo, sourceRange }) => ({
+        type: 'geo',
+        geo,
+        sourceRange,
+      }))
+    } else if (geoMeta.type === 'transform') {
+      console.log('transform', geoMeta, programMemory)
+      const geos = processShownObjects(programMemory)(
+        programMemory.root[geoMeta.id]
+      ).map((arg): ViewerArtifact => {
+        if (arg.type !== 'geo')
+          throw new Error('transform must be applied to geo')
+        const { geo, sourceRange } = arg
+        const newGeo = geo.clone()
+        newGeo.rotateX(geoMeta.rotation[0])
+        newGeo.rotateY(geoMeta.rotation[1])
+        newGeo.rotateZ(geoMeta.rotation[2])
+        newGeo.translate(
+          geoMeta.transform[0],
+          geoMeta.transform[1],
+          geoMeta.transform[2]
+        )
+        return {
+          type: 'geo',
+          sourceRange,
+          geo: newGeo,
+        }
+      })
+      return [
+        {
+          type: 'parent',
+          sourceRange: geoMeta.sourceRange,
+          children: geos,
+        },
+      ]
+    }
+    throw new Error('Unknown geoMeta type')
+  }

src/lang/sketch.ts

@@ -4,6 +4,8 @@ import { BufferGeometry } from 'three'
 
 type Coords2d = [number, number]
 type SourceRange = [number, number]
+type Rotation3 = [number, number, number]
+type Translate3 = [number, number, number]
 
 export type Path =
   | {
@@ -53,6 +55,14 @@ export type Path =
       sourceRange: SourceRange
     }
 
+export interface Transform {
+  type: 'transform'
+  rotation: Rotation3
+  transform: Translate3
+  id: string
+  sourceRange: SourceRange
+}
+
 function addBasePath(programMemory: ProgramMemory) {
   const geo = baseGeo({ from: [0, 0, 0] })
   const base: Path = {
@@ -193,4 +203,20 @@ export const sketchFns = {
       currentPath,
     }
   },
+  rx: (
+    programMemory: ProgramMemory,
+    sourceRange: SourceRange,
+    rotationD: number,
+    id: string
+  ): Transform => {
+    if (!programMemory.root[id]) throw new Error(`No variable with name ${id}`)
+    const rotationR = rotationD * (Math.PI / 180)
+    return {
+      type: 'transform',
+      rotation: [rotationR, 0, 0],
+      transform: [0, 0, 0],
+      id,
+      sourceRange,
+    }
+  },
 }