feat: output backend files

src/main/wacc/frontend/Error.scala

@@ -2,6 +2,7 @@ package wacc
 
 import wacc.ast.Position
 import wacc.types._
+import java.io.PrintStream
 
 /** Error types for semantic errors
   */
@@ -23,39 +24,39 @@ enum Error {
   * @param errorContent
   *   Contents of the file to generate code snippets
   */
-def printError(error: Error)(using errorContent: String): Unit = {
-  println("Semantic error:")
+def printError(error: Error)(using errorContent: String, stdout: PrintStream): Unit = {
+  stdout.println("Semantic error:")
   error match {
     case Error.DuplicateDeclaration(ident) =>
       printPosition(ident.pos)
-      println(s"Duplicate declaration of identifier ${ident.v}")
+      stdout.println(s"Duplicate declaration of identifier ${ident.v}")
       highlight(ident.pos, ident.v.length)
     case Error.UndeclaredVariable(ident) =>
       printPosition(ident.pos)
-      println(s"Undeclared variable ${ident.v}")
+      stdout.println(s"Undeclared variable ${ident.v}")
       highlight(ident.pos, ident.v.length)
     case Error.UndefinedFunction(ident) =>
       printPosition(ident.pos)
-      println(s"Undefined function ${ident.v}")
+      stdout.println(s"Undefined function ${ident.v}")
       highlight(ident.pos, ident.v.length)
     case Error.FunctionParamsMismatch(id, expected, got, funcType) =>
       printPosition(id.pos)
-      println(s"Function expects $expected parameters, got $got")
-      println(
+      stdout.println(s"Function expects $expected parameters, got $got")
+      stdout.println(
         s"(function ${id.v} has type (${funcType.params.mkString(", ")}) -> ${funcType.returnType})"
       )
       highlight(id.pos, 1)
     case Error.TypeMismatch(pos, expected, got, msg) =>
       printPosition(pos)
-      println(s"Type mismatch: $msg\nExpected: $expected\nGot: $got")
+      stdout.println(s"Type mismatch: $msg\nExpected: $expected\nGot: $got")
       highlight(pos, 1)
     case Error.SemanticError(pos, msg) =>
       printPosition(pos)
-      println(msg)
+      stdout.println(msg)
       highlight(pos, 1)
     case wacc.Error.InternalError(pos, msg) =>
       printPosition(pos)
-      println(s"Internal error: $msg")
+      stdout.println(s"Internal error: $msg")
       highlight(pos, 1)
   }
 
@@ -70,7 +71,7 @@ def printError(error: Error)(using errorContent: String): Unit = {
   * @param errorContent
   *   Contents of the file to generate code snippets
   */
-def highlight(pos: Position, size: Int)(using errorContent: String): Unit = {
+def highlight(pos: Position, size: Int)(using errorContent: String, stdout: PrintStream): Unit = {
   val lines = errorContent.split("\n")
 
   val preLine = if (pos.line > 1) lines(pos.line - 2) else ""
@@ -78,7 +79,7 @@ def highlight(pos: Position, size: Int)(using errorContent: String): Unit = {
   val postLine = if (pos.line < lines.size) lines(pos.line) else ""
   val linePointer = " " * (pos.column + 2) + ("^" * (size)) + "\n"
 
-  println(
+  stdout.println(
     s"  >$preLine\n  >$midLine\n$linePointer  >$postLine"
   )
 }
@@ -88,6 +89,6 @@ def highlight(pos: Position, size: Int)(using errorContent: String): Unit = {
   * @param pos
   *   Position of the error
   */
-def printPosition(pos: Position): Unit = {
-  println(s"(line ${pos.line}, column ${pos.column}):")
+def printPosition(pos: Position)(using stdout: PrintStream): Unit = {
+  stdout.println(s"(line ${pos.line}, column ${pos.column}):")
 }