1 files changed, 46 insertions, 0 deletions
diff --git a/llparse-frontend/src/node/single.ts b/llparse-frontend/src/node/single.ts
new file mode 100644
index 0000000..0acf715
--- /dev/null
+++ b/llparse-frontend/src/node/single.ts
@@ -0,0 +1,46 @@
+import * as assert from 'assert';
+
+import { IUniqueName } from '../utils';
+import { IWrap } from '../wrap';
+import { Node } from './base';
+import { Match } from './match';
+import { Slot } from './slot';
+
+interface ISingleEdge {
+  readonly key: number;
+  node: IWrap<Node>;
+  readonly noAdvance: boolean;
+  readonly value: number | undefined;
+}
+
+export interface IReadonlySingleEdge {
+  readonly key: number;
+  node: IWrap<Node>;
+  readonly noAdvance: boolean;
+  readonly value: number | undefined;
+}
+
+export class Single extends Match {
+  private readonly privEdges: ISingleEdge[] = [];
+
+  public addEdge(edge: IReadonlySingleEdge): void {
+    this.privEdges.push({
+      key: edge.key,
+      noAdvance: edge.noAdvance,
+      node: edge.node,
+      value: edge.value,
+    });
+  }
+
+  public get edges(): ReadonlyArray<IReadonlySingleEdge> {
+    return this.privEdges;
+  }
+
+  protected *buildSlots() {
+    for (const edge of this.privEdges) {
+      yield new Slot(edge.node, (value) => edge.node = value);
+    }
+
+    yield* super.buildSlots();
+  }
+}