docs and test tweaks

AUTHORS

@@ -0,0 +1 @@
+Scott Horn

README.md

@@ -29,37 +29,39 @@ From [wikipedia](https://en.wikipedia.org/wiki/VisiCalc)
 Simple usage examples below:
 
 ```dart
- final rows = {
-    'A1'.a1: '-12.2',
-    'A2'.a1: '(a5 + 45)',
-    'A3'.a1: '13',
-    'A4'.a1: '+A2 + A5 - A6',
-    'A5'.a1: '-A3 / 2 + 2 ',
-    'A6'.a1: '.23 * 2',
-    'B1'.a1: 'A1 + A3 * 3',
-    'B2'.a1: '(A1 + A3) * 3',
+import 'package:a1/a1.dart';
+import 'package:visicalc_engine/visicalc_engine.dart';
+
+void main(List<String> arguments) {
+  final sheet = {
+    'A1'.a1: '/FR-12.2',
+    'A2'.a1: '(a5+45)',
+    'A3'.a1: '/F*13',
+    'A4'.a1: '+A2+A5-A6',
+    'A5'.a1: '-A3/2+2',
+    'A6'.a1: '/F\$.23*2',
+    'B1'.a1: '+A1+A3*3',
+    'B2'.a1: '(A1+A3)*3',
     'B3'.a1: '12.23e-12',
     'B4'.a1: '.23e12',
-    'B5'.a1: 'b4',
-    'B6'.a1: 'b2',
-    'B7'.a1: '@sum(a1...b6)' // 1 + 1 + 28
+    'B5'.a1: '/FRb4',
+    'B6'.a1: '+b2',
+    'B7'.a1: '@sum(a1...b6)',
+    'D13'.a1: '+b2',
   };
-
-  final evaluator = Evaluator();
-  final parser = evaluator.build();
-
-  final Map<A1, FormulaType> varMap = <A1, FormulaType>{};
-  for (final MapEntry(:key, :value) in rows.entries) {
-    final ast = parser.parse(value);
-
-    if (ast is Success) {
-      varMap[key] = ast.value;
-    }
-  }
-  for (final MapEntry(:key, :value) in varMap.entries) {
-    final evalResult = value.eval(ResultCacheMap(varMap));
-    print('$key -> ${evalResult.runtimeType} -> $evalResult');
-  }
+  final worksheet = Engine(sheet, parseErrorThrows: true);
+  print(worksheet);
+
+  // Change cell
+  var b5 = worksheet["B5".a1];
+  print('B5 formula was ${b5?.formulaType?.asFormula} = $b5');
+  print('Now setting B5 to formula a1');
+  worksheet['B5'.a1] = '+a1';
+
+  b5 = worksheet["B5".a1];
+  print('Now B5 formula is ${b5?.formulaType?.asFormula} = $b5');
+  print(worksheet);
+}
 ```
 The `test/` directory explores other use cases for the A1 types and library.
 

example/example.dart

@@ -9,14 +9,14 @@ void main(List<String> arguments) {
     'A4'.a1: '+A2+A5-A6',
     'A5'.a1: '-A3/2+2',
     'A6'.a1: '/F\$.23*2',
-    'B1'.a1: 'A1+A3*3',
+    'B1'.a1: '+A1+A3*3',
     'B2'.a1: '(A1+A3)*3',
     'B3'.a1: '12.23e-12',
     'B4'.a1: '.23e12',
     'B5'.a1: '/FRb4',
-    'B6'.a1: 'b2',
+    'B6'.a1: '+b2',
     'B7'.a1: '@sum(a1...b6)',
-    'D13'.a1: 'b2',
+    'D13'.a1: '+b2',
   };
   final worksheet = Engine(sheet, parseErrorThrows: true);
   print(worksheet);
@@ -25,7 +25,7 @@ void main(List<String> arguments) {
   var b5 = worksheet["B5".a1];
   print('B5 formula was ${b5?.formulaType?.asFormula} = $b5');
   print('Now setting B5 to formula a1');
-  worksheet['B5'.a1] = 'a1';
+  worksheet['B5'.a1] = '+a1';
 
   b5 = worksheet["B5".a1];
   print('Now B5 formula is ${b5?.formulaType?.asFormula} = $b5');