X-Git-Url: https://git.llucax.com/software/pymin.git/blobdiff_plain/f2571fe7b62abfa67f4b805c266869058647afff..7d2f3da6aee023c991c9669a6a4664bd8be53a97:/pymin/dispatcher.py

diff --git a/pymin/dispatcher.py b/pymin/dispatcher.py
index 7e9ef60..39b4b75 100644
--- a/pymin/dispatcher.py
+++ b/pymin/dispatcher.py
@@ -19,7 +19,16 @@ class Error(RuntimeError):
     command - is the command that raised the exception, expressed as a list of
               paths (or subcommands).
     """
-    pass
+
+    def __init__(self, message):
+        r"Initialize the Error object. See class documentation for more info."
+        self.message = message
+
+    def __unicode__(self):
+        return self.message
+
+    def __str__(self):
+        return unicode(self).encode('utf-8')
 
 class HandlerError(Error):
     r"""HandlerError(command) -> HandlerError instance :: Base handlers error.
@@ -37,25 +46,59 @@ class CommandError(Error):
     """
 
     def __init__(self, command):
-        r"""Initialize the object.
-
-        See class documentation for more info.
-        """
+        r"Initialize the object, see class documentation for more info."
         self.command = command
 
-    def __str__(self):
-        return 'Command error: "%s"' % self.command
+    def __unicode__(self):
+        return u'Error in command "%s".' % u' '.join(self.command)
+
+class CommandNotSpecifiedError(CommandError):
+    r"""CommandNotSpecifiedError() -> CommandNotSpecifiedError instance.
+
+    This exception is raised when an empty command string is received.
+    """
+
+    def __init__(self):
+        r"Initialize the object, see class documentation for more info."
+        pass
+
+    def __unicode__(self):
+        return u'Command not specified.'
+
+class CommandIsAHandlerError(CommandError):
+    r"""CommandIsAHandlerError() -> CommandIsAHandlerError instance.
+
+    This exception is raised when a command is a handler containing commands
+    instead of a command itself.
+    """
+
+    def __unicode__(self):
+        command = ' '.join(self.command)
+        return u'"%s" is a handler, not a command (type "%s help" for help).' \
+                    % (command, command)
+
+class CommandNotInHandlerError(CommandError):
+    r"""CommandNotInHandlerError() -> CommandNotInHandlerError instance.
+
+    This exception is raised when a command parent is a hanlder containing
+    commands, but the command itself is not found.
+    """
+
+    def __unicode__(self):
+        return u'Command "%(c)s" not found in handler "%(h)s" ' \
+                u'(type "%(h)s help" for help).' \
+                        % dict(c=u' '.join(self.command[-1:]),
+                                h=u' '.join(self.command[0:-1]))
 
 class CommandNotFoundError(CommandError):
-    r"""CommandNotFoundError(command) -> CommandNotFoundError instance.
+    r"""CommandNotFoundError(command[, handler]) -> CommandNotFoundError object.
 
     This exception is raised when the command received can't be dispatched
     because there is no handlers to process it.
     """
 
-    def __str__(self):
-        return 'Command not found: "%s"' % ' '.join(
-                                                repr(c) for c in self.command)
+    def __unicode__(self):
+        return u'Command "%s" not found.' % u' '.join(self.command)
 
 class ParseError(CommandError):
     r"""ParseError(command[, desc]) -> ParseError instance
@@ -75,8 +118,26 @@ class ParseError(CommandError):
         self.command = command
         self.desc = desc
 
-    def __str__(self):
-        return 'Syntax error, %s: %s' % (self.desc, self.command)
+    def __unicode__(self):
+        return u'Syntax error, %s: %s' % (self.desc, self.command)
+
+class HelpNotFoundError(Error):
+    r"""HelpNotFoundError(command) -> HelpNotFoundError instance.
+
+    This exception is raised when a help command can't find the command
+    asked for help.
+    """
+
+    def __init__(self, command):
+        r"""Initialize the object.
+
+        See class documentation for more info.
+        """
+        self.command = command
+
+    def __unicode__(self):
+        return u"Can't get help for '%s', command not found." % self.command
+
 
 def handler(help):
     r"""handler(help) -> function wrapper :: Mark a callable as a handler.
@@ -88,33 +149,32 @@ def handler(help):
     def wrapper(f):
         if not help:
             raise TypeError("'help' should not be empty")
-        f._dispatcher_help = help
+        f._dispatcher_handler = True
+        f.handler_help = help
         return f
     return wrapper
 
 def is_handler(handler):
     r"is_handler(handler) -> bool :: Tell if a object is a handler."
-    return callable(handler) and hasattr(handler, '_dispatcher_help')
-
-def get_help(handler):
-    r"get_help(handler) -> unicode :: Get a handler's help string."
-    if not is_handler(handler):
-        raise TypeError("'%s' should be a handler" % handler.__name__)
-    return handler._dispatcher_help
+    return callable(handler) and hasattr(handler, '_dispatcher_handler') \
+                and handler._dispatcher_handler
 
 class Handler:
     r"""Handler() -> Handler instance :: Base class for all dispatcher handlers.
 
     All dispatcher handlers should inherit from this class to have some extra
-    commands, like help.
+    commands, like help. You should override the 'handler_help' attribute to a
+    nice help message describing the handler.
     """
 
-    @handler(u'List available commands.')
+    handler_help = u'Undocumented handler'
+
+    @handler(u'List available commands')
     def commands(self):
         r"""commands() -> generator :: List the available commands."""
         return (a for a in dir(self) if is_handler(getattr(self, a)))
 
-    @handler(u'Show available commands with their help.')
+    @handler(u'Show available commands with their help')
     def help(self, command=None):
         r"""help([command]) -> unicode/dict :: Show help on available commands.
 
@@ -123,14 +183,19 @@ class Handler:
         and values are the help strings.
         """
         if command is None:
-            return dict((a, get_help(getattr(self, a)))
-                        for a in dir(self) if is_handler(getattr(self, a)))
-        if not hasattr(self, command):
-            raise CommandNotFoundError(command)
-        handler = getattr(self, command)
-        if not is_handler(handler):
-            raise CommandNotFoundError(command)
-        return get_help(handler)
+            d = dict()
+            for a in dir(self):
+                h = getattr(self, a)
+                if is_handler(h) or isinstance(h, Handler):
+                    d[a] = h.handler_help
+            return d
+        # A command was specified
+        if not hasattr(self, command.encode('utf-8')):
+            raise HelpNotFoundError(command)
+        handler = getattr(self, command.encode('utf-8'))
+        if not is_handler(handler) and not hasattr(handler):
+            raise HelpNotFoundError(command)
+        return handler.handler_help
 
 def parse_command(command):
     r"""parse_command(command) -> (args, kwargs) :: Parse a command.
@@ -318,9 +383,7 @@ class Dispatcher:
     'arg1', 'arg 2', arg=3) will be called. The handler "tree" can be as
     complex and deep as you want.
 
-    If some command can't be dispatched (because there is no root handler
-    or there is no matching callable attribute), a CommandNotFoundError
-    is raised.
+    If some command can't be dispatched, a CommandError subclass is raised.
     """
 
     def __init__(self, root):
@@ -334,41 +397,47 @@ class Dispatcher:
         r"""dispatch(route) -> None :: Dispatch a command string.
 
         This method searches for a suitable callable object in the routes
-        "tree" and call it, or raises a CommandNotFoundError if the command
+        "tree" and call it, or raises a CommandError subclass if the command
         can't be dispatched.
+
+        route - *unicode* string with the command route.
         """
         command = list()
         (route, kwargs) = parse_command(route)
         if not route:
-            raise CommandNotFoundError(command)
+            raise CommandNotSpecifiedError()
         handler = self.root
         while not is_handler(handler):
             if len(route) is 0:
+                if isinstance(handler, Handler):
+                    raise CommandIsAHandlerError(command)
                 raise CommandNotFoundError(command)
             command.append(route[0])
-            if not hasattr(handler, route[0]):
+            if not hasattr(handler, route[0].encode('utf-8')):
+                if isinstance(handler, Handler) and len(command) > 1:
+                    raise CommandNotInHandlerError(command)
                 raise CommandNotFoundError(command)
-            handler = getattr(handler, route[0])
+            handler = getattr(handler, route[0].encode('utf-8'))
             route = route[1:]
         return handler(*route, **kwargs)
 
 
 if __name__ == '__main__':
 
-    @handler(u"test: Print all the arguments, return nothing.")
+    @handler(u"test: Print all the arguments, return nothing")
     def test_func(*args):
         print 'func:', args
 
     class TestClassSubHandler(Handler):
-        @handler(u"subcmd: Print all the arguments, return nothing.")
+        @handler(u"subcmd: Print all the arguments, return nothing")
         def subcmd(self, *args):
             print 'class.subclass.subcmd:', args
 
     class TestClass(Handler):
-        @handler(u"cmd1: Print all the arguments, return nothing.")
+        @handler(u"cmd1: Print all the arguments, return nothing")
         def cmd1(self, *args):
             print 'class.cmd1:', args
-        @handler(u"cmd2: Print all the arguments, return nothing.")
+        @handler(u"cmd2: Print all the arguments, return nothing")
         def cmd2(self, *args):
             print 'class.cmd2:', args
         subclass = TestClassSubHandler()
@@ -388,7 +457,7 @@ if __name__ == '__main__':
     d.dispatch('inst subclass subcmd arg1 arg2 arg3 arg4 arg5')
     try:
         d.dispatch('')
-    except CommandNotFoundError, e:
+    except CommandNotSpecifiedError, e:
         print 'Not found:', e
     try:
         d.dispatch('sucutrule piquete culete')
@@ -396,7 +465,11 @@ if __name__ == '__main__':
         print 'Not found:', e
     try:
         d.dispatch('inst cmd3 arg1 arg2 arg3')
-    except CommandNotFoundError, e:
+    except CommandNotInHandlerError, e:
+        print 'Not found:', e
+    try:
+        d.dispatch('inst')
+    except CommandIsAHandlerError, e:
         print 'Not found:', e
     print
     print