added bar stuff

Triangle.Compiler/src/main/java/triangle/codeGenerator/Encoder.java

@@ -101,6 +101,7 @@ import triangle.abstractSyntaxTrees.vnames.SimpleVname;
 import triangle.abstractSyntaxTrees.vnames.SubscriptVname;
 import triangle.abstractSyntaxTrees.vnames.Vname;
 import triangle.codeGenerator.entities.AddressableEntity;
+import triangle.codeGenerator.entities.BarPrimitiveRoutine;
 import triangle.codeGenerator.entities.EqualityRoutine;
 import triangle.codeGenerator.entities.FetchableEntity;
 import triangle.codeGenerator.entities.Field;
@@ -184,6 +185,11 @@ public final class Encoder implements ActualParameterVisitor<Frame, Integer>,
 	
 	@Override
 	public Void visitRepeatCommand(RepeatCommand ast, Frame frame) {
+		var loopAddr = emitter.getNextInstrAddr();
+		ast.C.visit(this, frame);
+		ast.E.visit(this, frame);
+		emitter.emit(OpCode.JUMPIF, Machine.falseRep, Register.CB, loopAddr);
+		
 		return null;
 	}
 
@@ -740,6 +746,7 @@ public final class Encoder implements ActualParameterVisitor<Frame, Integer>,
 		elaborateStdPrimRoutine(StdEnvironment.puteolDecl, Primitive.PUTEOL);
 		elaborateStdEqRoutine(StdEnvironment.equalDecl, Primitive.EQ);
 		elaborateStdEqRoutine(StdEnvironment.unequalDecl, Primitive.NE);
+		StdEnvironment.barDecl.entity = new BarPrimitiveRoutine(); //bardemo.tri now works
 	}
 
 	boolean tableDetailsReqd;

Triangle.Compiler/src/main/java/triangle/codeGenerator/entities/BarPrimitiveRoutine.java

@@ -0,0 +1,27 @@
+package triangle.codeGenerator.entities;
+
+import triangle.abstractMachine.Machine;
+import triangle.abstractMachine.OpCode;
+import triangle.abstractMachine.Primitive;
+import triangle.abstractMachine.Register;
+import triangle.codeGenerator.Emitter;
+import triangle.codeGenerator.Frame;
+
+public class BarPrimitiveRoutine extends RuntimeEntity implements RoutineEntity {
+
+	public BarPrimitiveRoutine() {
+		super(Machine.closureSize);
+	}
+
+	public void encodeCall(Emitter emitter, Frame frame) {
+		//machine code to load 100 onto the stack
+		emitter.emit(OpCode.LOADL, 0, 100);
+		emitter.emit(OpCode.CALL, Register.PB, Primitive.MULT);
+	}
+
+	public void encodeFetch(Emitter emitter, Frame frame) {
+		emitter.emit(OpCode.LOADA, 0, Register.SB, 0);
+		emitter.emit(OpCode.LOADA, Register.PB, Primitive.MULT);
+	}
+
+}

Triangle.Compiler/src/main/java/triangle/contextualAnalyzer/Checker.java

@@ -188,6 +188,11 @@ public final class Checker implements ActualParameterVisitor<FormalParameter, Vo
 	
 	@Override
 	public Void visitRepeatCommand(RepeatCommand ast, Void arg) {
+		var eType = ast.E.visit(this);
+
+		checkAndReportError(eType.equals(StdEnvironment.booleanType), "Boolean expression expected here", ast.E);
+		ast.C.visit(this);
+
 		return null;
 	}
 

Triangle.Compiler/src/main/java/triangle/optimiser/ConstantFolder.java

@@ -497,14 +497,13 @@ public class ConstantFolder implements ActualParameterVisitor<Void, AbstractSynt
 		return null;
 	}
 	
-	/*
 	@Override
 	public AbstractSyntaxTree visitRepeatCommand(RepeatCommand ast, Void arg) {
 		return null;
 	}
-	*/
 
-	// TODO uncomment if you've implemented the repeat command
+	/*
+	 * Now not needed!
 	@Override
 	public AbstractSyntaxTree visitRepeatCommand(RepeatCommand ast, Void arg) {
 		ast.C.visit(this);
@@ -514,6 +513,7 @@ public class ConstantFolder implements ActualParameterVisitor<Void, AbstractSynt
 		}
 		return null;
 	}
+	*/
 
 	@Override
 	public AbstractSyntaxTree visitMultipleArrayAggregate(MultipleArrayAggregate ast, Void arg) {

programs/bardemo.tri

@@ -5,7 +5,7 @@ let
 
 in
     begin
-        a := 1;
+        a := 4;
         b := 2;
         
         putint(a);

programs/plusplusidea.tri

@@ -0,0 +1,8 @@
+let
+    var a: Integer
+in
+begin
+    a := 0;
+    a := a + 1;
+    putint(a);
+end