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src/compiler/NubLang/Generation/QBE/QBEWriter.cs

@@ -0,0 +1,80 @@
+using System.Text;
+using NubLang.Syntax.Node;
+
+namespace NubLang.Generation.QBE;
+
+internal class QBEWriter
+{
+    private readonly StringBuilder _builder = new();
+    private int _currentLine = -1;
+
+    public QBEWriter(string debugFile)
+    {
+        _builder.AppendLine($"dbgfile \"{debugFile}\"");
+        _builder.AppendLine();
+    }
+
+    public void StartFunction(string signature)
+    {
+        _currentLine = -1;
+        _builder.Append(signature);
+        _builder.AppendLine(" {");
+        _builder.AppendLine("@start");
+    }
+
+    public void EndFunction()
+    {
+        _builder.AppendLine("}");
+    }
+
+    private void WriteDebugLocation(SourceSpan span)
+    {
+        var line = span.Start.Line;
+
+        if (_currentLine != line)
+        {
+            _builder.AppendLine($"    dbgloc {line}");
+            _currentLine = line;
+        }
+    }
+
+    public void WriteDebugLocation(BoundNode node)
+    {
+        var firstToken = node.Tokens.FirstOrDefault();
+        if (firstToken != null)
+        {
+            // WriteDebugLocation(firstToken.Span);
+        }
+    }
+
+    public void Indented(string value)
+    {
+        _builder.Append('\t');
+        _builder.AppendLine(value);
+    }
+
+    public void Comment(string comment)
+    {
+        _builder.AppendLine("# " + comment);
+    }
+
+    public void WriteLine(string text)
+    {
+        _builder.AppendLine(text);
+    }
+
+    public void Write(string text)
+    {
+        _builder.Append(text);
+    }
+
+    public void NewLine()
+    {
+        _builder.AppendLine();
+    }
+
+    public override string ToString()
+    {
+        return _builder.ToString();
+    }
+}