de.fxnn.brainfuck.tape

Class InfiniteCharacterTape

java.lang.Object

de.fxnn.brainfuck.tape.AbstractInfiniteTape<Integer>

de.fxnn.brainfuck.tape.InfiniteCharacterTape

All Implemented Interfaces:

Tape<Integer>

public class InfiniteCharacterTape
extends AbstractInfiniteTape<Integer>

NOTE, that a Character is not sufficient to represent each Unicode character. Actually, two chars are needed, a high and a low surrogate one. Therefore, we use Integer here.

Overflow is handled such that each value on tape is in the range between Character.MIN_CODE_POINT and Character.MAX_CODE_POINT, decrementing on the minimum value leads to the maximum one and vice versa.

Reading EOF: There's the special case of TapeEofBehaviour.READS_MINUS_ONE. Then, on reading EOF from the input stream, the tape will contain a -1, which denotes no legal Character and behaves as follows:

• Incrementing it leads to 0,
• decrementing it leads to Character.MAX_CODE_POINT.
• On output it is treated as the NUL character.

See the unit tests for details.

Constructor Summary

Constructors

Constructor and Description
InfiniteCharacterTape(Charset charset, TapeEofBehaviour eofBehaviour)

Method Summary

Modifier and Type	Method and Description
protected TapeSegment<Integer>	createSegment()
void	decrement()
void	increment()
boolean	isZero()
void	readTo(DataOutput output)
void	writeFrom(DataInput input)

Methods inherited from class de.fxnn.brainfuck.tape.AbstractInfiniteTape

createNextSegment, getOrCreateNextSegment, getOrCreatePreviousSegment, moveBackward, moveForward, read, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

InfiniteCharacterTape

public InfiniteCharacterTape(Charset charset,
                             TapeEofBehaviour eofBehaviour)

Method Detail

createSegment

protected TapeSegment<Integer> createSegment()

Specified by:

createSegment in class AbstractInfiniteTape<Integer>

increment

public void increment()

decrement

public void decrement()

readTo

public void readTo(DataOutput output)
            throws TapeIOException

Throws:

TapeIOException

writeFrom

public void writeFrom(DataInput input)
               throws TapeIOException

Throws:

TapeIOException

isZero

public boolean isZero()