private static IBlock GetWhileBlock(Queue <string> commands, State state, IIntreperter intreperter)
{
Queue <string> instructions = new Queue <string>();
bool blockFinished = false;
int bracketsCount = 0;
while (commands.Count > 0 && blockFinished == false)
{
string line = commands.Peek();
if (line.Contains('{'))
{
bracketsCount++;
}
else if (line.Contains('}'))
{
bracketsCount--;
}
instructions.Enqueue(commands.Dequeue());
if (bracketsCount <= 0)
{
blockFinished = true;
}
}
IBlock whileBlock = new WhileBlock(instructions, state, intreperter);
return(whileBlock);
}
private static IBlock GetGeneralBlock(Queue <string> commands, IIntreperter intreperter)
{
Queue <string> instructions = new Queue <string>();
bool blockFinished = false;
while (commands.Count > 0 && blockFinished == false)
{
string line = commands.Peek();
if (line.StartsWith("IF") || line.StartsWith("WHILE"))
{
blockFinished = true;
}
else if (line.Contains('}') || line == string.Empty)
{
commands.Dequeue();
}
else
{
instructions.Enqueue(commands.Dequeue());
}
}
IBlock genBlock = null;
if (instructions.Count > 0)
{
genBlock = new GeneralBlock(instructions, intreperter);
}
return(genBlock);
}
public WhileBlock(Queue <string> commands, State state, IIntreperter intreperter)
{
_intreperter = intreperter;
_predicate = commands.Dequeue();
_commands = new Queue <string>(commands);
_blocks = BlockGenerator.Generate(commands, state, intreperter).ToArray();
_state = state;
_blockIndex = 0;
_currentBlock = null;
_isFinished = false;
_predicateMet = null;
}
public IfBlock(Queue <string> commandsIf, Queue <string> commandsElse, State state, IIntreperter intreperter)
{
_intreperter = intreperter;
_predicate = commandsIf.Dequeue();
// dequeue first line
if (commandsElse.Count > 0)
{
commandsElse.Dequeue();
}
_blocksIf = BlockGenerator.Generate(commandsIf, state, intreperter);
_blocksElse = BlockGenerator.Generate(commandsElse, state, intreperter);
}
private static IBlock GetIfBlock(Queue <string> commands, State state, IIntreperter intreperter)
{
Queue <string> instructionsIf = new Queue <string>();
Queue <string> instructionsElse = new Queue <string>();
bool blockFinished = false;
bool inElse = false;
int bracketsCount = 0;
while (commands.Count > 0 && blockFinished == false)
{
string line = commands.Peek();
if (line.Contains('{'))
{
bracketsCount++;
}
else if (line.Contains('}'))
{
bracketsCount--;
}
if (inElse)
{
instructionsElse.Enqueue(commands.Dequeue());
}
else
{
instructionsIf.Enqueue(commands.Dequeue());
}
if (bracketsCount <= 0)
{
if (inElse || !commands.Peek().Contains("ELSE"))
{
blockFinished = true;
}
else
{
inElse = true;
}
}
}
IBlock ifBlock = new IfBlock(instructionsIf, instructionsElse, state, intreperter);
return(ifBlock);
}
public GeneralBlock(Queue <string> commands, IIntreperter intreperter)
{
_commands = commands;
_intreperter = intreperter;
}
internal static Queue <IBlock> Generate(Queue <string> commands, State state, IIntreperter intreperter)
{
Queue <IBlock> blocks = new Queue <IBlock>();
while (commands.Count > 0)
{
string line = commands.Peek();
if (line.StartsWith("IF"))
{
blocks.Enqueue(GetIfBlock(commands, state, intreperter));
}
else if (line.StartsWith("WHILE"))
{
blocks.Enqueue(GetWhileBlock(commands, state, intreperter));
}
else
{
blocks.Enqueue(GetGeneralBlock(commands, intreperter));
}
}
return(blocks);
}
