public List<Command> ProcessStatement(string statement, ref int pc, ref MemoryHandler mem, ref Dictionary<string, bool> compilerFlags)
{
var commands = new List<Command>();
var parts = statement.Split(' ');
if (_reservedVarNames.Contains(parts[1]))
throw new CompilerException($"Cannot use variable name {parts[1]} as it is reserved by the compiler", -1);
mem.Reserve(parts[1]);
if (parts.Length > 2) // var a = b
{
commands.Add(new Command(Operator.ReadCard, mem[parts[1]]) { NoEncode = true });
commands.Add(new Command(Operator.RawValue, int.Parse(parts[3])) { NoEncode = true });
}
return commands;
}
public List<Command> ProcessStatement(string statement, ref int pc, ref MemoryHandler mem, ref Dictionary<string, bool> compilerFlags)
{
//Fancy Linq for removing all spaces from the string
var processedStatement = statement.Where(c => c != ' ').Aggregate("", (current, c) => current + c);
if (processedStatement.Contains('='))
{
var commands = new List<Command>();
if (processedStatement.Contains("+=") || processedStatement.Contains("-="))
{
var parts = processedStatement.Split(new string[]{ "+=", "-=" }, StringSplitOptions.RemoveEmptyEntries);
var resultName = parts[0];
var op = parts[1];
op = mem.MakeConstantIfNeeded(op, ref commands, ref pc);
//If adding/subtracting to accumulator, can skip saving old
if (resultName != "acc")
{
if (!compilerFlags["accumulatorIsVolatile"])
commands.Add(new Command(Operator.StoreAccumulator, 98));
commands.Add(new Command(Operator.ClearAccumulator, mem[resultName]));
}
if (processedStatement.Contains('+'))
commands.Add(new Command(Operator.AddToAccumulator, mem[op]));
else if (processedStatement.Contains('-'))
commands.Add(new Command(Operator.SubtractFromAccumulator, mem[op]));
//If adding/subtracting to accumulator, can skip restore and saving
if (resultName != "acc")
{
if (!mem.IsReserved(resultName))
mem.Reserve(resultName);
commands.Add(new Command(Operator.StoreAccumulator, mem[resultName]));
if (!compilerFlags["accumulatorIsVolatile"])
{
commands.Add(new Command(Operator.ClearAccumulator, 98));
}
}
return Command.LoadToCards(commands, ref pc);
}
else
{
//A=B+C
var parts = processedStatement.Split('=', '*', '/', '+', '-');
var resultName = parts[0];
var op1 = parts[1]; //operand 1
var op2 = parts[2]; //operand 2
//Dump acc into mem(98)
//put op1 in acc
//add/sub to acc
//Reserve mem for result (maybe)
//dump acc to mem()
//restore acc
op1 = mem.MakeConstantIfNeeded(op1, ref commands, ref pc);
op2 = mem.MakeConstantIfNeeded(op2, ref commands, ref pc);
//If adding/subtracting to accumulator, can skip saving old
//If adding/subtracting to accumulator, can skip saving old
if (resultName != "acc")
{
if (!compilerFlags["accumulatorIsVolatile"])
commands.Add(new Command(Operator.StoreAccumulator, 98));
commands.Add(new Command(Operator.ClearAccumulator, mem[op1]));
}
if (processedStatement.Contains('+'))
commands.Add(new Command(Operator.AddToAccumulator, mem[op2]));
else if (processedStatement.Contains('-'))
commands.Add(new Command(Operator.SubtractFromAccumulator, mem[op2]));
//If adding/subtracting to accumulator, can skip restore and saving
if (resultName != "acc")
{
if (!mem.IsReserved(resultName))
mem.Reserve(resultName);
commands.Add(new Command(Operator.StoreAccumulator, mem[resultName]));
if (!compilerFlags["accumulatorIsVolatile"])
{
commands.Add(new Command(Operator.ClearAccumulator, 98));
}
}
return Command.LoadToCards(commands, ref pc);
}
}
else
{
//A++, A--
var add = processedStatement.Contains('+');
var variable = processedStatement.Trim('+', '-');
var commands = new List<Command>();
//Store accumulator to 98
//Load variable
//Increment/deincrement
//Store variable
//restore accumulator
//if target is not acc we can skip saving the acc
if (variable != "acc")
{
var memLocation = mem[variable];
commands.Add(new Command(Operator.StoreAccumulator, 98));
if (!compilerFlags["accumulatorIsVolatile"])
commands.Add(new Command(Operator.ClearAccumulator, memLocation));
}
commands.Add(new Command(add ? Operator.AddToAccumulator : Operator.SubtractFromAccumulator, 96)); //mem(96) contains variable 'one'
if (variable != "acc" && !compilerFlags["accumulatorIsVolatile"])
{
commands.Add(new Command(Operator.StoreAccumulator, mem[variable]));
if (!compilerFlags["accumulatorIsVolatile"])
commands.Add(new Command(Operator.ClearAccumulator, 98));
}
return Command.LoadToCards(commands, ref pc);
}
}