From 56d9915eaf4af3b2d0e9c4e929ea1d704a87e62f Mon Sep 17 00:00:00 2001
From: Robert Sesek <rsesek@bluestatic.org>
Date: Wed, 19 Feb 2020 23:53:02 -0500
Subject: [PATCH] Add Form.getValue()

---
 src/Form.test.ts | 14 ++++++++++++++
 src/Form.ts      |  6 ++++++
 2 files changed, 20 insertions(+)

diff --git a/src/Form.test.ts b/src/Form.test.ts
index b7c3d0e..55078a7 100644
--- a/src/Form.test.ts
+++ b/src/Form.test.ts
@@ -84,3 +84,17 @@ test('input', () => {
   const f = new TestForm({ filingStatus: 'S', money: 100.0 });
   expect(f.getInput('filingStatus')).toBe('S');
 });
+
+test('get value', () => {
+  class TestForm extends Form {
+    get name() { return 'Form'; }
+
+    protected getLines() {
+      return [ new ComputedLine<number>('line', () => 42) ];
+    }
+  };
+
+  const f = new TestForm();
+  const tr = new TaxReturn(2019);
+  expect(f.getValue(tr, 'line')).toBe(42);
+});
diff --git a/src/Form.ts b/src/Form.ts
index 07e9ccc..e3d6c4e 100644
--- a/src/Form.ts
+++ b/src/Form.ts
@@ -1,3 +1,4 @@
+import TaxReturn from './TaxReturn';
 import { Line } from './Line';
 import { InconsistencyError, NotFoundError } from './Errors';
 
@@ -36,6 +37,11 @@ export default abstract class Form<I = unknown> {
     return lines[0];
   }
 
+  getValue<T>(tr: TaxReturn, id: string): T {
+    const line: Line<T> = this.getLine(id);
+    return line.value(tr);
+  }
+
   getInput<K extends keyof I>(name: K): I[K] {
     if (!(name in this._input)) {
       throw new NotFoundError(`No input with key ${name} on form ${this.name}`);
-- 
2.22.5