feat: add CincinnatiSheetWriter for per-plate subprogram emission

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenNest.Tests/Cincinnati/CincinnatiSheetWriterTests.cs

@@ -0,0 +1,117 @@
+using System.IO;
+using System.Linq;
+using System.Text;
+using OpenNest.CNC;
+using OpenNest.Geometry;
+using OpenNest.Posts.Cincinnati;
+
+namespace OpenNest.Tests.Cincinnati;
+
+public class CincinnatiSheetWriterTests
+{
+    [Fact]
+    public void WriteSheet_EmitsSheetHeader()
+    {
+        var config = new CincinnatiPostConfig
+        {
+            DefaultLibraryFile = "MS135N2PANEL.lib",
+            PostedAccuracy = 4
+        };
+        var plate = new Plate(48.0, 96.0);
+        plate.Parts.Add(new Part(new Drawing("TestPart", CreateSimpleProgram())));
+
+        var sb = new StringBuilder();
+        using var sw = new StringWriter(sb);
+        var sheetWriter = new CincinnatiSheetWriter(config, new ProgramVariableManager());
+
+        sheetWriter.Write(sw, plate, "TestNest", 1, 101);
+
+        var output = sb.ToString();
+        Assert.Contains(":101", output);
+        Assert.Contains("( Sheet 1 )", output);
+        Assert.Contains("#110=", output);
+        Assert.Contains("#111=", output);
+        Assert.Contains("G92X#5021Y#5022", output);
+        Assert.Contains("M99", output);
+    }
+
+    [Fact]
+    public void WriteSheet_EmitsReturnToOriginAndPalletExchange()
+    {
+        var config = new CincinnatiPostConfig
+        {
+            PalletExchange = PalletMode.EndOfSheet,
+            PostedAccuracy = 4
+        };
+        var plate = new Plate(48.0, 96.0);
+        plate.Parts.Add(new Part(new Drawing("TestPart", CreateSimpleProgram())));
+
+        var sb = new StringBuilder();
+        using var sw = new StringWriter(sb);
+        var sheetWriter = new CincinnatiSheetWriter(config, new ProgramVariableManager());
+
+        sheetWriter.Write(sw, plate, "TestNest", 1, 101);
+
+        var output = sb.ToString();
+        Assert.Contains("M42", output);
+        Assert.Contains("G0X0Y0", output);
+        Assert.Contains("M50", output);
+    }
+
+    [Fact]
+    public void WriteSheet_SkipsEmptyPlate()
+    {
+        var config = new CincinnatiPostConfig { PostedAccuracy = 4 };
+        var plate = new Plate(48.0, 96.0);
+
+        var sb = new StringBuilder();
+        using var sw = new StringWriter(sb);
+        var sheetWriter = new CincinnatiSheetWriter(config, new ProgramVariableManager());
+
+        sheetWriter.Write(sw, plate, "TestNest", 1, 101);
+
+        Assert.Equal("", sb.ToString());
+    }
+
+    [Fact]
+    public void WriteSheet_SplitsMultiContourParts()
+    {
+        var config = new CincinnatiPostConfig { PostedAccuracy = 4 };
+        var pgm = new Program();
+        // First contour (hole)
+        pgm.Codes.Add(new RapidMove(1, 1));
+        pgm.Codes.Add(new LinearMove(2, 1));
+        pgm.Codes.Add(new LinearMove(2, 2));
+        pgm.Codes.Add(new LinearMove(1, 1));
+        // Second contour (exterior)
+        pgm.Codes.Add(new RapidMove(0, 0));
+        pgm.Codes.Add(new LinearMove(5, 0));
+        pgm.Codes.Add(new LinearMove(5, 5));
+        pgm.Codes.Add(new LinearMove(0, 0));
+
+        var plate = new Plate(48.0, 96.0);
+        plate.Parts.Add(new Part(new Drawing("MultiContour", pgm)));
+
+        var sb = new StringBuilder();
+        using var sw = new StringWriter(sb);
+        var sheetWriter = new CincinnatiSheetWriter(config, new ProgramVariableManager());
+
+        sheetWriter.Write(sw, plate, "TestNest", 1, 101);
+
+        var output = sb.ToString();
+        // Should have two G84 pierce commands (one per contour)
+        var g84Count = output.Split('\n').Count(l => l.Trim() == "G84");
+        Assert.Equal(2, g84Count);
+    }
+
+    private static Program CreateSimpleProgram()
+    {
+        var pgm = new Program();
+        pgm.Codes.Add(new RapidMove(0, 0));
+        pgm.Codes.Add(new LinearMove(1, 0));
+        pgm.Codes.Add(new LinearMove(1, 1));
+        pgm.Codes.Add(new LinearMove(0, 1));
+        pgm.Codes.Add(new LinearMove(0, 0));
+        return pgm;
+    }
+}