continued reorganisation

bcrypter/cli/cmd.py

@@ -0,0 +1,46 @@
+from bcrypter.lib.result import Result
+
+class Command:
+    NAME = '[Abstract]Command'
+    ARGS = []
+    FLAGS = []
+    OPTIONS = []
+    def __init__(self, args: list[string]) -> None:
+        pass
+
+    @classmethod
+    def parse(cls: Command, cmd: list[str]) -> Result[Command]:
+        for arg in cmd[1:]:
+            # flag or option
+            if arg.startswith('--'):
+                match = cls._match_arg(arg[2:])
+                if match
+
+    '''
+    Check whether FLAGS and OPTIONS are defined consistently
+    (ie no duplicate names or parsing ambiguity)  
+    '''
+    @classmethod
+    def _is_well_defined(cls: Command) -> Result[None]:
+        raise NotImplementedException('Command.is_consistent()')
+    
+    '''
+    Attempt to match an arg to its flag or option
+    NOTE: _match_arg() assumes _is_well_defined() == True 
+    '''
+    @classmethod
+    def _match_arg(cls: Command, arg: str) -> Result[None]:
+        for opt in chain(cls.FLAGS, cls.OPTIONS):
+            if opt.matches(arg):
+                return Result.succeed(None)
+        return Result.fail()
+
+
+class Builtin(Command):
+    self.NAME = '[Abstract]Builtin'
+    def __init__(self, 
+                 repl_builtins: list[Builtin], 
+                 repl_cmds: list[Command]) -> None:
+        super().__init__()
+        self._repl_builtins = repl_builtins
+        self._repl_cmds = repl_cmds