feat: solved day 3

03/MullItOver/PuzzleParser.cs

@@ -0,0 +1,55 @@
+using System.Text.RegularExpressions;
+
+namespace MullItOver;
+
+partial class PuzzleParser
+{
+  [GeneratedRegex(@"mul\((\d{1,3}),(\d{1,3})\)")]
+  private static partial Regex InstructionsRegex();
+  
+  [GeneratedRegex(@"mul\((\d{1,3}),(\d{1,3})\)|do\(\)|don't\(\)")]
+  private static partial Regex InstructionsWithConditionalsRegex();
+  
+  public List<Instruction> Parse(string input)
+  {
+    var matches = InstructionsRegex().Matches(input);
+    return matches
+      .Select(Instruction (m) => new MulInstruction(
+        int.Parse(m.Groups[1].Value), 
+        int.Parse(m.Groups[2].Value)
+      ))
+      .ToList();
+  }
+  
+  public List<Instruction> ParseWithConditionals(string input)
+  {
+    var instructions = new List<Instruction>();
+    var matches = InstructionsWithConditionalsRegex()
+      .Matches(input)
+      .ToList();
+
+    foreach (var match in matches)
+    {
+      var firstGroup = match.Groups[0].Value;
+      
+      if (firstGroup.Contains("mul"))
+      {
+        instructions.Add(new MulInstruction(
+          int.Parse(match.Groups[1].Value), 
+          int.Parse(match.Groups[2].Value)
+        ));
+        continue;
+      }
+
+      if (firstGroup.Contains('\''))
+      {
+        instructions.Add(new DontInstruction());
+        continue;
+      }
+      
+      instructions.Add(new DoInstruction());
+    }
+
+    return instructions;
+  }
+}