add level 3 and backport textparser changes

Level3/Level3.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../Common/Common.csproj" />
+  </ItemGroup>
+
+</Project>

Level3/Level3Solver.cs

@@ -0,0 +1,80 @@
+namespace AoC24;
+
+using AoC24.Common;
+using AoCLevelInputProvider;
+using Parsing;
+using Parsing.Schema;
+using Parsing.Tokenization;
+
+public class Level3Solver : FragmentLevelSolverBase
+{
+    public override int LevelNumber
+    {
+        get { return 3; }
+    }
+
+    protected override FragmentSchemaBuilder DefineInputSchema(FragmentSchemaBuilder schemaBuilder)
+    {
+        return schemaBuilder
+                    .StartOptions()
+                        .Option()
+                            .Expect("mul(")
+                            .Expect(InputType.Integer, "num1")
+                            .Expect(",")
+                            .Expect(InputType.Integer, "num2")
+                            .Expect(")")
+                        .Option()
+                            .Expect("do()", "on")
+                        .Option()
+                            .Expect("don't()", "off")
+                    .EndOptions();
+                    
+    }
+
+    public override string SolveFirstStar()
+    {
+        return this.GetData()
+                       .AsFragments()
+                       .ConvertAll((Fragment f) =>
+                        {
+                            if(!f.ContainsKey("num1") || f["num1"].Count == 0)
+                            {
+                                return 0;
+                            }
+                            int numProd = int.Parse(f["num1"][0]);
+                            numProd *= int.Parse(f["num2"][0]);
+                            return numProd;
+                        })
+                        .ReduceData((int num1, int num2) => num1 + num2)
+                        .ToString();
+    }
+
+    public override string SolveSecondStar()
+    {
+        bool isOn = true;
+        return this.GetData()
+                       .AsFragments()
+                       .ConvertAll((Fragment f) =>
+                        {
+                            if(f["on"].Count > 0)
+                            {
+                                isOn = true;
+                                return 0;
+                            }
+                            if(f["off"].Count > 0)
+                            {
+                                isOn = false;
+                                return 0;
+                            }
+                            if(!isOn)
+                            {
+                                return 0;
+                            }
+                            int numProd = int.Parse(f["num1"][0]);
+                            numProd *= int.Parse(f["num2"][0]) ;
+                            return numProd;
+                        })
+                        .ReduceData((int num1, int num2) => num1 + num2)
+                        .ToString();
+    }
+}

Level3/Program.cs

@@ -0,0 +1,24 @@
+// See https://aka.ms/new-console-template for more information
+
+using AoC24;
+
+var levelSolver = new Level3Solver();
+var solution1 = levelSolver.SolveFirstStar();
+var solution2 = levelSolver.SolveSecondStar();
+
+if (!string.IsNullOrEmpty(solution1))
+{
+    Console.WriteLine("Solution for example 1 is: " + solution1);
+}
+else
+{
+    Console.WriteLine("Example 1 has not been solved yet!");
+}
+if (!string.IsNullOrEmpty(solution2))
+{
+    Console.WriteLine("Solution for example 2 is: " + solution2);
+}
+else
+{
+    Console.WriteLine("Example 2 has not been solved yet!");
+}