factor out State and CycleCounter to a new machine module and rename

transcoder/opcodes.py

@@ -3,49 +3,8 @@
 import enum
 from typing import Iterator, Tuple
 
-import numpy as np
-
-import screen
 import symbol_table
-
-
-class CycleCounter:
-    def __init__(self):
-        self.cycles = 0  # type:int
-
-    def tick(self, cycles: int) -> None:
-        self.cycles += cycles
-
-    def reset(self) -> None:
-        self.cycles = 0
-
-
-class State:
-    """Represents virtual machine state."""
-
-    def __init__(self, cycle_counter: CycleCounter,
-                 memmap: screen.MemoryMap, update_priority: np.array):
-        self.page = 0x20
-        self.content = 0x7f
-
-        self.memmap = memmap
-        self.cycle_counter = cycle_counter
-        self.update_priority = update_priority
-
-    def emit(self, opcode: "Opcode") -> Iterator[int]:
-        cmd = opcode.emit_command(opcode)
-        if cmd:
-            yield from cmd
-        data = opcode.emit_data()
-        if data:
-            yield from data
-
-        # Update changes in memory map, if any
-        opcode.apply(self)
-
-        # Tick 6502 CPU
-        self.cycle_counter.tick(opcode.cycles)
-
+from machine import Machine
 
 _op_cmds = [
     "TERMINATE",
@@ -94,7 +53,7 @@ class Opcode:
     def emit_data(self) -> Iterator[int]:
         return
 
-    def apply(self, state: State):
+    def apply(self, state: Machine):
         pass