1 files changed, 39 insertions, 0 deletions
diff --git a/llparse-frontend/src/node/invoke.ts b/llparse-frontend/src/node/invoke.ts
new file mode 100644
index 0000000..ba6ef53
--- /dev/null
+++ b/llparse-frontend/src/node/invoke.ts
@@ -0,0 +1,39 @@
+import { Code } from '../code';
+import { IUniqueName } from '../utils';
+import { IWrap } from '../wrap';
+import { Node } from './base';
+import { Slot } from './slot';
+
+interface IInvokeEdge {
+  readonly code: number;
+  node: IWrap<Node>;
+}
+
+export interface IReadonlyInvokeEdge {
+  readonly code: number;
+  readonly node: IWrap<Node>;
+}
+
+export class Invoke extends Node {
+  private readonly privEdges: IInvokeEdge[] = [];
+
+  constructor(id: IUniqueName, public readonly code: IWrap<Code>) {
+    super(id);
+  }
+
+  public addEdge(code: number, node: IWrap<Node>): void {
+    this.privEdges.push({ code, node });
+  }
+
+  public get edges(): ReadonlyArray<IReadonlyInvokeEdge> {
+    return this.privEdges;
+  }
+
+  protected *buildSlots() {
+    for (const edge of this.privEdges) {
+      yield new Slot(edge.node, (value) => edge.node = value);
+    }
+
+    yield* super.buildSlots();
+  }
+}