public byte GetSumFromSeries(CharReader cr, Char lookupChar)
{
_hits++;
var startPosition = cr.Position;
var cachedCount = _seriesCache[startPosition];
if (cachedCount != 0)
{
cr.Position += cachedCount - 1;
if (cachedCount > 10)
{
_cacheHits++;
}
return(cachedCount);
}
byte count = 1;
cr.Forward();
while (cr.GetChar() == lookupChar)
{
count += 1; cr.Forward();
}
cr.Back();
_seriesCache[startPosition] = count;
return(count);
}
private int CountSeries(CharReader cr)
{
var count = 0;
var currentChar = cr.GetChar();
while (cr.HasCharacters() && cr.GetChar() == currentChar)
{
count++;
cr.Forward();
}
cr.Back();
return(count);
}
private Instruction GetComboInstruction(CharReader cr)
{
var newInstruction = new Instruction(InstructionType.Combo);
while (cr.HasCharacters())
{
var c = cr.GetChar();
if (c == '[' || c == ']' || c == '.' || c == ',')
{
break;
}
if (c == '+')
{
newInstruction.Add();
}
if (c == '-')
{
newInstruction.Subtract();
}
if (c == '<')
{
newInstruction.ShiftLeft();
}
if (c == '>')
{
newInstruction.ShiftRight();
}
cr.Forward();
}
cr.Back();
newInstruction.Complete();
return(newInstruction);
}
public void Run(FileStream source)
{
var pointer = 0;
var memory = new byte[1024 * 1024];
var cr = new CharReader(source);
while (cr.HasCharacters())
{
var c = cr.GetChar();
switch (c)
{
case '>':
pointer++;
break;
case '<':
pointer--;
break;
case '+':
memory[pointer]++;
break;
case '-':
memory[pointer]--;
break;
case '.':
Console.Write((char)memory[pointer]);
break;
case ',':
var newChar = Console.Read();
memory[pointer] = (byte)newChar;
break;
case '[':
var nesting = 0;
if (memory[pointer] == 0)
{
while (cr.HasCharacters())
{
cr.Forward();
var tempChar = cr.GetChar();
if (tempChar == ']' && nesting == 0)
{
break;
}
if (tempChar == '[')
{
nesting++;
}
if (tempChar == ']')
{
nesting--;
}
}
}
break;
case ']':
nesting = 0;
if (memory[pointer] != 0)
{
while (true)
{
cr.Back();
var tempChar = cr.GetChar();
if (tempChar == '[' && nesting == 0)
{
cr.GetChar(); break;
}
if (tempChar == ']')
{
nesting++;
}
if (tempChar == '[')
{
nesting--;
}
}
}
break;
}
cr.Forward();
}
}
