Initial commit

creature.go

@@ -0,0 +1,66 @@
+package creature
+
+type Machine struct {
+	stack   []int
+	Program []int
+	Block   []int
+	counter int
+	pointer int
+}
+
+func (machine *Machine) Execute (offset int) {
+	machine.counter = offset
+
+	for {
+		switch machine.Program[machine.counter] {
+		case 0x0:
+		case 0x1:
+		case 0x2:
+		case 0x3:
+		case 0x4:
+		case 0x5:
+		case 0x6:
+		case 0x7:
+		case 0x8:
+		case 0x9:
+		case 0xa:
+		case 0xb:
+		case 0xc:
+		case 0xd:
+		case 0xe:
+		case 0xf:
+		}
+		machine.counter ++
+	}
+}
+
+// reallocateStack changes the size of the stack to something reasonable. This
+// should be called then the stack pointer is really small compared to the
+// actual stack size, or the stack pointer is bigger than the stack.
+func (machine *Machine) reallocateStack () {
+	reallocatedStack := make([]int, machine.pointer * 3 / 2)
+	copy(reallocatedStack, machine.stack)
+	machine.stack = reallocatedStack
+}
+
+// Push pushes a word onto the stack, increasing the stack pointer and
+// reallocating the stack if necessary.
+func (machine *Machine) Push (word int) {
+	machine.pointer ++
+	if len(machine.stack) <= machine.pointer {
+		machine.reallocateStack()
+	}
+}
+
+// Pop pops the last word off of the stack, and returns it, decreasing the stack
+// pointer and reallocating the stack if necessary.
+func (machine *Machine) Pop () (word int) {
+	word = machine.stack[machine.pointer]
+	machine.pointer --
+
+	if machine.pointer < len(machine.stack) / 3 {
+		machine.reallocateStack()
+	}
+	
+	return
+}