1 files changed, 23 insertions, 1 deletions

diff --git a/Compiler/Program.cs b/Compiler/Program.cs
index 3a277a1..09f7127 100644
--- a/Compiler/Program.cs
+++ b/Compiler/Program.cs
@@ -2,6 +2,7 @@
 
 using System.Text;
 using Antlr4.Runtime;
+using Antlr4.Runtime.Misc;
 using CommandLine;
 using visitors;
 using Parser = CommandLine.Parser;
@@ -26,7 +27,7 @@ public class Program
 
         try
         {
-            AntlrFileStream inputStream = new(options.InputFile);
+            ICharStream inputStream = new PreprocessingCharStream(options.InputFile);
             CGrammarLexer lexer = new(inputStream);
             lexer.RemoveErrorListeners();
 
@@ -48,4 +49,25 @@ public class Program
             Console.WriteLine($"{ex.Message}");
         }
     }
+}
+
+public class PreprocessingCharStream : ICharStream
+{
+    private readonly AntlrInputStream inner;
+
+    public PreprocessingCharStream(string filePath)
+    {
+        string preprocessed = Preprocessor.Process(filePath);
+        inner = new AntlrInputStream(preprocessed);
+    }
+
+    public int Index => inner.Index;
+    public int Size => inner.Size;
+    public string SourceName => inner.SourceName;
+    public void Consume() => inner.Consume();
+    public int LA(int i) => inner.LA(i);
+    public int Mark() => inner.Mark();
+    public void Release(int marker) => inner.Release(marker);
+    public void Seek(int index) => inner.Seek(index);
+    public string GetText(Interval interval) => inner.GetText(interval);
 }
\ No newline at end of file