Add jump instructions

hal/instructions.go

@@ -45,6 +45,9 @@ var instructions = []*Instruction{
 	InstructionLoadNum,
 	InstructionStore,
 	InstructionJumpNeg,
+	InstructionJumpPos,
+	InstructionJumpNull,
+	InstructionJump,
 	InstructionAddnum,
 }
 
@@ -121,19 +124,37 @@ var InstructionStore = &Instruction{
 	},
 }
 
-var InstructionJumpNeg = &Instruction{
+func newJumpInstruction(name string, doJump func(accumulator float64) bool) *Instruction {
-	Name: "JUMPNEG",
+	return &Instruction{
+		Name: "JUMPPOS",
 		ExecuteWithOperand: func(module *Module, operand float64) error {
 			index := int64(operand)
 			if _, ok := module.programStorage[index]; !ok {
 				return fmt.Errorf("index %d does not exist in program storage", index)
 			}
-		if module.accumulator < 0 {
+			if doJump(module.accumulator) {
 				return module.setProgramCounter(index)
 			}
 			return nil
 		},
 	}
+}
+
+var InstructionJumpNeg = newJumpInstruction("JUMPNEG", func(accumulator float64) bool {
+	return accumulator > 0
+})
+
+var InstructionJumpPos = newJumpInstruction("JUMPPOS", func(accumulator float64) bool {
+	return accumulator < 0
+})
+
+var InstructionJumpNull = newJumpInstruction("JUMPNULL", func(accumulator float64) bool {
+	return accumulator == 0
+})
+
+var InstructionJump = newJumpInstruction("JUMP", func(accumulator float64) bool {
+	return true
+})
 
 var InstructionAddnum = &Instruction{
 	Name: "ADDNUM",