From b82b6875eeeb7dc6b69fe2de1734abc2efc66632 Mon Sep 17 00:00:00 2001
From: Elias Haugsbakk <elias.haugsbakk@gmail.com>
Date: Thu, 17 Sep 2026 20:02:59 +0200
Subject: read input file and pass to assembler and linker

---
 .../java/no/eliashaugsbakk/kompilator/Main.java    | 131 +++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/main/java/no/eliashaugsbakk/kompilator/Main.java

(limited to 'src/main/java')

diff --git a/src/main/java/no/eliashaugsbakk/kompilator/Main.java b/src/main/java/no/eliashaugsbakk/kompilator/Main.java
new file mode 100644
index 0000000..f57b13a
--- /dev/null
+++ b/src/main/java/no/eliashaugsbakk/kompilator/Main.java
@@ -0,0 +1,131 @@
+package no.eliashaugsbakk.kompilator;
+
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Main {
+  public static final String programFileExtension = "spå";
+
+  private record InputProgram(String programName, String programContent) {}
+
+  static void main(String[] args) {
+    if (args.length != 1) {
+      IO.println("Only accepts one argument: The filename of the input program");
+      System.exit(1);
+    }
+    InputProgram inputProgram = readInputProgram(args[0]);
+
+    /*
+    String IR = createIR(inputFile);
+    String assembly = createAssembly(IR);
+    */
+
+    assemblingAndLInking(inputProgram);
+
+    System.exit(0);
+  }
+
+  private static void assemblingAndLInking(InputProgram inputProgram) {
+    String assemblyFileName = inputProgram.programName + ".s";
+    String assembledFileName = inputProgram.programContent + ".o";
+
+    try {
+      FileWriter fw = new FileWriter(assemblyFileName);
+      fw.write(inputProgram.programContent);
+      fw.close();
+    } catch (IOException e) {
+      IO.println("Could not write file: " + e.getMessage());
+    }
+
+    try {
+      // Assembling using: as -o program.o program.s
+      ProcessBuilder asPB = new ProcessBuilder("as", "-o", assembledFileName, assemblyFileName);
+      runProcess(asPB);
+    } catch (IOException e) {
+      IO.println("Failed to invoke GCC\n\n" + e);
+    } catch (InterruptedException e) {
+      IO.println("Failed to wait for gcc output\n\n" + e);
+    }
+
+    try {
+      // Linking using GNU linker: ld -o program program.o
+      ProcessBuilder ldPB = new ProcessBuilder("ld", "-o", inputProgram.programName, assembledFileName);
+      runProcess(ldPB);
+    } catch (IOException e) {
+      IO.println("Failed to invoke GCC\n\n" + e);
+    } catch (InterruptedException e) {
+      IO.println("Failed to wait for gcc output\n\n" + e);
+    }
+
+    // Clean up
+    try {
+      Files.delete(Path.of(assemblyFileName));
+    } catch (IOException e) {
+      IO.println("Could not delete assembly file: " + e.getMessage());
+    }
+    try {
+      Files.delete(Path.of(assembledFileName));
+    } catch (IOException e) {
+      IO.println("Could not delete assembled file: " + e.getMessage());
+    }
+  }
+
+  private static void runProcess(ProcessBuilder processBuilder) throws IOException, InterruptedException {
+    Process process = processBuilder.start();
+    process.waitFor();
+    if (process.exitValue() != 0) {
+      BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
+
+      String line;
+      while ((line = bufferedReader.readLine()) != null) {
+        System.out.println(line);
+      }
+      bufferedReader.close();
+    }
+  }
+
+  private static InputProgram readInputProgram(String inputFilePath) {
+    IO.println("Input file path: " + inputFilePath);
+
+    if (!inputFilePath.endsWith("." + programFileExtension)) {
+      IO.println("Input file must use the file extension: " + programFileExtension);
+      System.exit(1);
+    }
+
+    String programName = inputFilePath.substring(
+        inputFilePath.lastIndexOf("/") + 1,
+        inputFilePath.lastIndexOf("."));
+    IO.println("Program name: " + programName);
+
+    String programContent = null;
+
+    try(BufferedReader br = new BufferedReader(new FileReader(inputFilePath))) {
+      StringBuilder sb = new StringBuilder();
+      String line = br.readLine();
+
+      while (line != null) {
+        sb.append(line);
+        sb.append(System.lineSeparator());
+        line = br.readLine();
+      }
+      programContent = sb.toString();
+    } catch (FileNotFoundException e) {
+      IO.println("File not found");
+    } catch (IOException e) {
+      IO.println(e.getMessage());
+    }
+
+    if (programContent == null) {
+      IO.println("Could not read input file");
+      System.exit(1);
+    }
+
+    return new InputProgram(programName, programContent);
+  }
+}
-- 
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