public void GetIntegerReturnsTheNextIntegerInTheScriptData()
{
SetUpScriptData(bw =>
{
bw.Write(65);
bw.Write(3);
bw.Write(14);
});
_programCounter.GetInteger().Should().Be(65);
_programCounter.GetInteger().Should().Be(3);
_programCounter.GetInteger().Should().Be(14);
}
void MoveScriptPointerIfStackValueIsZero(IProgramCounter programCounter)
{
var distance = programCounter.GetInteger();
if (_stack.PopValue() == 0)
{
programCounter.MoveScriptPointer(distance);
}
}
void ProcessFnRoutine(IProgramCounter programCounter, IVariableManager localVariables)
{
var parameterCount = programCounter.GetInteger();
var fnRoutineName = programCounter.GetNullTerminatedString();
var parameters = GetStackParametersIfRequired(parameterCount);
var result = _fnRoutinesCaller.CallFnRoutine(localVariables, fnRoutineName, parameters);
_stack.PushValue(result);
}
bool ProcessDropSkipPauseNotZero(IProgramCounter programCounter)
{
var distance = programCounter.GetInteger();
var value = _stack.PopValue();
switch (value)
{
case (int)ScriptReturn.Continue:
return(true);
case (int)ScriptReturn.PauseRepeat:
programCounter.MoveScriptPointer(distance - 4);
return(false);
case (int)ScriptReturn.Pause:
return(false);
}
return(true);
}
bool RunScriptCommand(IProgramCounter programCounter, IVariableManager localVariables)
{
if (programCounter.Eof)
{
throw new Exception($"Unexpected end of script found in '{programCounter.GetScriptName()}'");
}
var command = programCounter.GetCommand();
switch ((ScriptToken)command)
{
case ScriptToken.PushIntValue:
_stack.PushValue(programCounter.GetInteger());
break;
case ScriptToken.PushStringValue:
_stack.PushValue(programCounter.GetNullTerminatedString());
break;
case ScriptToken.PushGlobalVariable: // 4
PushGlobalVariableOnToTheStack(programCounter);
break;
case ScriptToken.PopGlobalVariable: // 5
SetGlobalVariableToBottomValueOfStack(programCounter);
break;
case ScriptToken.Jfalse: // 6
MoveScriptPointerIfStackValueIsZero(programCounter);
break;
case ScriptToken.Jtrue: // 7
MoveScriptPointerIfStackValueIsNotZero(programCounter);
break;
case ScriptToken.Jall: // 8
MoveScriptPointerAlways(programCounter);
break;
case ScriptToken.Add: // 9
_stack.Add();
break;
case ScriptToken.Subtract: // 10
_stack.Subtract();
break;
case ScriptToken.Multiply: // 11
_stack.Multiply();
break;
case ScriptToken.Divide: // 12
_stack.Divide();
break;
case ScriptToken.Negate: // 13
_stack.Negate();
break;
case ScriptToken.LogicalNot: // 14
_stack.LogicalNot();
break;
case ScriptToken.Lt: // 15
_stack.Lt();
break;
case ScriptToken.Gt: // 16
_stack.Gt();
break;
case ScriptToken.Lte: // 17
_stack.Lte();
break;
case ScriptToken.Gte: // 18
_stack.Gte();
break;
case ScriptToken.VariableEquals: // 19
_stack.VariableEquals();
break;
case ScriptToken.LogicalAnd: // 20
_stack.LogicalAnd();
break;
case ScriptToken.LogicalOr: // 21
_stack.LogicalOr();
break;
case ScriptToken.CallFnRoutine: // 22
ProcessFnRoutine(programCounter, localVariables);
break;
case ScriptToken.DropStackValue: // 23
return(_stack.PopValue() == 0);
case ScriptToken.EndScript: // 24
return(false);
case ScriptToken.DropSkipPauseNotZero: // 25
return(ProcessDropSkipPauseNotZero(programCounter));
case ScriptToken.PauseScript: // 26
return(false);
case ScriptToken.PushLocalVariable: // 27
PushLocalVariableOnToTheStack(programCounter, localVariables);
break;
case ScriptToken.PopLocalVariable: // 28
SetLocalVariableToBottomValueOfStack(programCounter, localVariables);
break;
default:
throw new InvalidOperationException($"Invalid Script Command {command}");
}
return(true);
}
void MoveScriptPointerAlways(IProgramCounter programCounter)
{
var distance = programCounter.GetInteger();
programCounter.MoveScriptPointer(distance);
}