elimino una reevaluación de los inputs

lib/ai/formula_screen.dart

@@ -26,12 +26,14 @@ class D4rtEditingController extends TextEditingController {
   String? _lastError;
 
   String? get lastError => _lastError;
+  Number? _lastValue;
 
   D4rtEditingController({String? text}) : super(text: text);
 
   bool validate() {
     try {
-      FormulaEvaluator.evaluateExpression(text);
+      _lastValue = null;
+      _lastValue = FormulaEvaluator.evaluateExpression(text);
       _lastError = null;
       return true;
     } catch (e) {
@@ -40,6 +42,8 @@ class D4rtEditingController extends TextEditingController {
     }
   }
 
+  get d4rtValue => _lastValue;
+
   @override
   set text(String newText) {
     super.text = newText;
@@ -90,9 +94,11 @@ class _FormulaScreenState extends State<FormulaScreen> {
     try {
       final inputValues = <String, dynamic>{};
       for (final input in widget.formula.input) {
-        final text = _inputControllers[input.name]!.text;
+        final controller = _inputControllers[input.name]!;
-        //final value = double.tryParse(text) ?? 0.0;
+        if( controller.d4rtValue == null ){
-        final value = FormulaEvaluator.evaluateExpression(text);
+          throw FormulaEvaluationException( "Field ${input.name} is invalid" );
+        }
+        final value = controller.d4rtValue;
 
         // Convert input to base unit if needed
         // Always convert from dropdown unit to variable's base unit

lib/corpus.dart

@@ -156,7 +156,7 @@ class Corpus{
     }
   }
 
-  static dynamic _evaluate(String code, [D4rt? interpreter]) {
+  static Number _evaluate(String code, [D4rt? interpreter]) {
     final d4rtInterpreter = interpreter ?? FormulaEvaluator.createDefaultInterpreter();
     FormulaEvaluator.prepareInterpreter(d4rtInterpreter);
     final completeCode = "${FormulaEvaluator.d4rtImports}\n$code";

lib/defaults/formulas.d4rt

@@ -38,7 +38,7 @@ Where:
     "description": r'''
 Newton's law of universal gravitation
 
-$$F = G\\frac{m_1m_2}{r^2}$$
+\(F = G\\frac{m_1m_2}{r^2}\)
 
 Where:
 - $G$: Gravitational constant ($6.674\\times 10^{-11}\\ \\mathrm{N\\cdot m^2/kg^2}$)

lib/formula_evaluator.dart

@@ -62,8 +62,7 @@ class FormulaEvaluator {
     final d4rtInterpreter = interpreter ?? createDefaultInterpreter();
     prepareInterpreter(d4rtInterpreter);
     final d4rtCode = """
-      import 'dart:math';
+      ${d4rtImports}
-      import "package:d4rt_formulas.dart";
       main()
       {
         late var result;

linux/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,10 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <url_launcher_linux/url_launcher_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
+  g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
+  url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);
 }

linux/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  url_launcher_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -5,6 +5,8 @@
 import FlutterMacOS
 import Foundation
 
+import url_launcher_macos
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  UrlLauncherPlugin.register(with: registry.registrar(forPlugin: "UrlLauncherPlugin"))
 }

pubspec.lock

@@ -125,10 +125,10 @@ packages:
     dependency: "direct main"
     description:
       name: d4rt
-      sha256: f731c2027db3e1365fd2162d30a41ccbfe01d8b75901deba5fa167306d2fcf31
+      sha256: "1eb626145e2ed97332f9e6e842e626f973d3969ce30e2794efb4744bd8aeba63"
       url: "https://pub.dev"
     source: hosted
-    version: "0.1.4"
+    version: "0.1.7"
   equatable:
     dependency: transitive
     description:
@@ -170,10 +170,10 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_d4rt
-      sha256: "1ccdc72ff87e3ecd8b10824523f7a586860393b631b2351bd913f7d72969c776"
+      sha256: "7ab9d3f91de5c10db115ccab1d9b1588946f744850f5bacc243cfc9041dd0a4c"
       url: "https://pub.dev"
     source: hosted
-    version: "0.0.3"
+    version: "0.0.5"
   flutter_highlight:
     dependency: transitive
     description:
@@ -186,18 +186,18 @@ packages:
     dependency: "direct dev"
     description:
       name: flutter_lints
-      sha256: "5398f14efa795ffb7a33e9b6a08798b26a180edac4ad7db3f231e40f82ce11e1"
+      sha256: "3105dc8492f6183fb076ccf1f351ac3d60564bff92e20bfc4af9cc1651f4e7e1"
       url: "https://pub.dev"
     source: hosted
-    version: "5.0.0"
+    version: "6.0.0"
   flutter_markdown:
     dependency: "direct main"
     description:
       name: flutter_markdown
-      sha256: "04c4722cc36ec5af38acc38ece70d22d3c2123c61305d555750a091517bbe504"
+      sha256: "08fb8315236099ff8e90cb87bb2b935e0a724a3af1623000a9cec930468e0f27"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.23"
+    version: "0.7.7+1"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -284,10 +284,10 @@ packages:
     dependency: transitive
     description:
       name: leak_tracker
-      sha256: "8dcda04c3fc16c14f48a7bb586d4be1f0d1572731b6d81d51772ef47c02081e0"
+      sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"
       url: "https://pub.dev"
     source: hosted
-    version: "11.0.1"
+    version: "11.0.2"
   leak_tracker_flutter_testing:
     dependency: transitive
     description:
@@ -316,10 +316,10 @@ packages:
     dependency: transitive
     description:
       name: lints
-      sha256: c35bb79562d980e9a453fc715854e1ed39e24e7d0297a880ef54e17f9874a9d7
+      sha256: a5e2b223cb7c9c8efdc663ef484fdd95bb243bff242ef5b13e26883547fce9a0
       url: "https://pub.dev"
     source: hosted
-    version: "5.1.1"
+    version: "6.0.0"
   logging:
     dependency: transitive
     description:
@@ -412,10 +412,10 @@ packages:
     dependency: transitive
     description:
       name: pool
-      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
+      sha256: "978783255c543aa3586a1b3c21f6e9d720eb315376a915872c61ef8b5c20177d"
       url: "https://pub.dev"
     source: hosted
-    version: "1.5.1"
+    version: "1.5.2"
   pub_semver:
     dependency: transitive
     description:
@@ -657,10 +657,10 @@ packages:
     dependency: transitive
     description:
       name: watcher
-      sha256: "5bf046f41320ac97a469d506261797f35254fa61c641741ef32dacda98b7d39c"
+      sha256: "592ab6e2892f67760543fb712ff0177f4ec76c031f02f5b4ff8d3fc5eb9fb61a"
       url: "https://pub.dev"
     source: hosted
-    version: "1.1.3"
+    version: "1.1.4"
   web:
     dependency: transitive
     description:

pubspec.yaml

@@ -33,11 +33,11 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.8
+  cupertino_icons: 
   resource_portable:
   d4rt:
   flutter_d4rt:
-  flutter_markdown: ^0.6.0
+  flutter_markdown:
   flutter_code_editor:
 
   collection: any
@@ -50,7 +50,7 @@ dev_dependencies:
   # activated in the `analysis_options.yaml` file located at the root of your
   # package. See that file for information about deactivating specific lint
   # rules and activating additional ones.
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0
   test: ^1.26.3
 
 # For information on the generic Dart part of this file, see the

units-and-formulas-definition.md

@@ -0,0 +1,111 @@
+# Units and Formulas Definition Format
+
+## Units Specification
+
+Units are defined in `.d4rt.units` files using JSON arrays. Each unit can have:
+
+```dart
+{
+  "name": "unit name",      // Full name (required)
+  "symbol": "abbr",         // Symbol (required)
+  "isBase": true,           // Mark as base unit (exclusive with baseUnit)
+  "baseUnit": "parent",     // Reference unit for conversions
+  "factor": 1.0,           // Conversion factor to base unit
+  "toBase": "x * 1000",     // Conversion code to base (expression)
+  "fromBase": "x / 1000"    // Conversion code from base (expression)
+}
+```
+
+### Key Rules:
+1. Use either `isBase` OR `baseUnit`+conversion (factor or code)
+2. Factor-based units use simple multiplicative conversions
+3. Code-based units require both `toBase` and `fromBase` Dart expressions
+4. Code expressions:
+   - Use `x` as input variable
+   - Must return a numeric value
+   - Can use math functions via `dart:math`
+
+### Examples:
+**Simple Factor-based:**
+```json
+{
+  "name": "kilometer",
+  "symbol": "km",
+  "baseUnit": "meter",
+  "factor": 1000
+}
+```
+
+**Code-based Conversion:**
+```json
+{
+  "name": "Fahrenheit",
+  "symbol": "°F", 
+  "baseUnit": "Kelvin",
+  "toBase": "(x - 32) * 5/9 + 273.15",
+  "fromBase": "(x - 273.15) * 9/5 + 32"
+}
+```
+
+## Formulas Specification
+
+Formulas are defined in `.d4rt` files using JSON arrays. Each formula has:
+
+```dart
+{
+  "name": "Formula Name",       // Required
+  "description": "Markdown",    // Optional
+  "input": [                    // List of input variables
+    {
+      "name": "varName",        // Variable identifier
+      "unit": "unitName"        // Base unit for calculations
+    }
+  ],
+  "output": {                   // Single output variable
+    "name": "resultVar",
+    "unit": "outputUnit"  
+  },
+  "d4rtCode": "Dart code",      // Calculation logic
+  "tags": ["physics", "energy"] // Categories
+}
+```
+
+### Formula Code Rules:
+1. Input variables are declared as `final`
+2. Output variable must be assigned
+3. Can use:
+   - Basic math operators
+   - `dart:math` functions
+   - Custom functions from FormulaEvaluator
+4. Example:
+```dart
+// Inputs: m (kg), v (m/s)
+d4rtCode: "KE = 0.5 * m * pow(v, 2);"
+```
+
+### Conversion Code Examples
+
+**Expression-style:**
+```dart
+// Simple factor conversion
+final x = 5; // Value in source unit
+main() => x * 1000; // Convert to base unit
+```
+
+**Statement-style:**
+```dart 
+// Complex conversion with multiple steps
+final x = 212; // Fahrenheit
+main() {
+  var celsius = (x - 32) * 5/9;
+  return celsius + 273.15; // Convert to Kelvin
+}
+```
+
+## Validation Rules
+
+1. Units must form a DAG (no circular dependencies)
+2. Formulas must declare all input variables
+3. Output variable must be assigned in d4rtCode
+4. Unit conversion code must handle numeric inputs
+5. Base units must exist before derived units

windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,9 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <url_launcher_windows/url_launcher_windows.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  UrlLauncherWindowsRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("UrlLauncherWindows"));
 }

windows/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  url_launcher_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST