JavaScript unmarshalling WIP

src/runtime/javascript/ffi.ts

@@ -0,0 +1,68 @@
+/* eslint-disable @typescript-eslint/naming-convention */
+
+import ffi from 'ffi-napi'
+import ref, { Pointer } from 'ref-napi'
+import ref_struct from 'ref-struct-di'
+const Struct = ref_struct(ref)
+
+export const PgfExpr = ref.refType(ref.types.void)
+export const PgfLiteral = ref.refType(ref.types.void)
+
+const PgfUnmarshallerVtbl = Struct({
+  eabs: ref.refType(ref.types.void),
+  eapp: ref.refType(ref.types.void),
+  elit: ref.refType(ref.types.void),
+  emeta: ref.refType(ref.types.void),
+  efun: ref.refType(ref.types.void),
+  evar: ref.refType(ref.types.void),
+  etyped: ref.refType(ref.types.void),
+  eimplarg: ref.refType(ref.types.void),
+  lint: ref.refType(ref.types.void),
+  lflt: ref.refType(ref.types.void),
+  lstr: ref.refType(ref.types.void),
+  dtyp: ref.refType(ref.types.void),
+  free_ref: ref.refType(ref.types.void)
+})
+export const PgfUnmarshaller = Struct({
+  vtbl: ref.refType(PgfUnmarshallerVtbl)
+})
+
+const elit = ffi.Callback(PgfExpr, [PgfUnmarshaller, PgfLiteral],
+  function (self, lit: Pointer<any>): any { // eslint-disable-line @typescript-eslint/no-unused-vars
+    console.log('myelit')
+    console.log('  lit', lit)
+    return lit.deref()
+  })
+
+const lint = ffi.Callback(PgfLiteral, [PgfUnmarshaller, ref.types.size_t, ref.refType(ref.types.uint)],
+  function (self, size: number, val: Pointer<number>): any { // eslint-disable-line @typescript-eslint/no-unused-vars
+    console.log('mylint')
+    console.log('  size', size)
+    console.log('  val', val.deref())
+    // const x: number = val.deref()
+    return val
+  })
+
+const free_ref = ffi.Callback(ref.types.void, [PgfUnmarshaller, ref.refType(ref.types.void)],
+  function (self, x: any): void { // eslint-disable-line @typescript-eslint/no-unused-vars
+    console.log('free_ref')
+  })
+
+const vtbl = new PgfUnmarshallerVtbl({
+  eabs: ref.alloc('void').ref(),
+  eapp: ref.alloc('void').ref(),
+  elit: elit as any,
+  emeta: ref.alloc('void').ref(),
+  efun: ref.alloc('void').ref(),
+  evar: ref.alloc('void').ref(),
+  etyped: ref.alloc('void').ref(),
+  eimplarg: ref.alloc('void').ref(),
+  lint: lint as any,
+  lflt: ref.alloc('void').ref(),
+  lstr: ref.alloc('void').ref(),
+  dtyp: ref.alloc('void').ref(),
+  free_ref: free_ref as any
+})
+
+export const unmarshaller = new PgfUnmarshaller({ vtbl: vtbl.ref() })
+export const marshaller = {}