#   Copyright 2000-2004 Michael Hudson mwh@python.net

#

#                        All Rights Reserved

#

# Portions Copyright (c) 2005 Nokia Corporation 

#

# Permission to use, copy, modify, and distribute this software and

# its documentation for any purpose is hereby granted without fee,

# provided that the above copyright notice appear in all copies and

# that both that copyright notice and this permission notice appear in

# supporting documentation.

#

# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO

# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY

# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,

# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER

# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF

# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

# (naming modules after builtin functions is not such a hot idea...)

# an KeyTrans instance translates Event objects into Command objects

# hmm, at what level do we want [C-i] and [tab] to be equivalent?

# [meta-a] and [esc a]?  obviously, these are going to be equivalent

# for the UnixConsole, but should they be for PygameConsole?

# it would in any situation seem to be a bad idea to bind, say, [tab]

# and [C-i] to *different* things... but should binding one bind the

# other?

# executive, temporary decision: [tab] and [C-i] are distinct, but

# [meta-key] is identified with [esc key].  We demand that any console

# class does quite a lot towards emulating a unix terminal.

try:

    import unicodedata

except ImportError:

    import dumbunicodedata as unicodedata

class InputTranslator(object):

    def push(self, evt):

        pass

    def get(self):

        pass

    def empty(self):

        pass

class KeymapTranslator(InputTranslator):

    def __init__(self, keymap, verbose=0,

                 invalid_cls=None, character_cls=None):

        self.verbose = verbose

        from pyrepl.keymap import compile_keymap, parse_keys

        self.keymap = keymap

        self.invalid_cls = invalid_cls

        self.character_cls = character_cls

        d = {}

        for keyspec, command in keymap:

            keyseq = tuple(parse_keys(keyspec))

            d[keyseq] = command

        if self.verbose:

            print d

        self.k = self.ck = compile_keymap(d, ())

        self.results = []

        self.stack = []

    def push(self, evt):

        if self.verbose:

            print "pushed", evt.data,

        key = evt.data

        d = self.k.get(key)

        if isinstance(d, dict):

            if self.verbose:

                print "transition"

            self.stack.append(key)

            self.k = d

        else:

            if d is None:

                if self.verbose:

                    print "invalid"

                if self.stack or len(key) > 1 or (unicodedata.category(key) and unicodedata.category(key).startswith('C')):

                    self.results.append(

                        (self.invalid_cls, self.stack + [key]))

                else:

                    # small optimization:

                    self.k[key] = self.character_cls

                    self.results.append(

                        (self.character_cls, [key]))

            else:

                if self.verbose:

                    print "matched", d

                self.results.append((d, self.stack + [key]))

            self.stack = []

            self.k = self.ck

    def get(self):

        if self.results:

            return self.results.pop(0)

        else:

            return None

    def empty(self):

        return not self.results