#   Copyright 2000-2004 Michael Hudson mwh@python.net+
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#+
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#                        All Rights Reserved+
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#+
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# Portions Copyright (c) 2005 Nokia Corporation +
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#+
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# Permission to use, copy, modify, and distribute this software and+
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# its documentation for any purpose is hereby granted without fee,+
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# provided that the above copyright notice appear in all copies and+
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# that both that copyright notice and this permission notice appear in+
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# supporting documentation.+
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#+
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# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO+
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# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY+
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# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,+
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# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER+
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# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF+
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# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN+
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# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.+
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+
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# (naming modules after builtin functions is not such a hot idea...)+
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+
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# an KeyTrans instance translates Event objects into Command objects+
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+
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# hmm, at what level do we want [C-i] and [tab] to be equivalent?+
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# [meta-a] and [esc a]?  obviously, these are going to be equivalent+
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# for the UnixConsole, but should they be for PygameConsole?+
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+
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# it would in any situation seem to be a bad idea to bind, say, [tab]+
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# and [C-i] to *different* things... but should binding one bind the+
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# other?+
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+
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# executive, temporary decision: [tab] and [C-i] are distinct, but+
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# [meta-key] is identified with [esc key].  We demand that any console+
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# class does quite a lot towards emulating a unix terminal.+
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+
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try:+
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    import unicodedata+
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except ImportError:+
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    import dumbunicodedata as unicodedata+
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+
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class InputTranslator(object):+
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    def push(self, evt):+
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        pass+
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    def get(self):+
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        pass+
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    def empty(self):+
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        pass+
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+
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class KeymapTranslator(InputTranslator):+
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    def __init__(self, keymap, verbose=0,+
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                 invalid_cls=None, character_cls=None):+
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        self.verbose = verbose+
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        from pyrepl.keymap import compile_keymap, parse_keys+
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        self.keymap = keymap+
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        self.invalid_cls = invalid_cls+
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        self.character_cls = character_cls+
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        d = {}+
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        for keyspec, command in keymap:+
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            keyseq = tuple(parse_keys(keyspec))+
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            d[keyseq] = command+
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        if self.verbose:+
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            print d+
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        self.k = self.ck = compile_keymap(d, ())+
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        self.results = []+
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        self.stack = []+
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    def push(self, evt):+
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        if self.verbose:+
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            print "pushed", evt.data,+
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        key = evt.data+
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        d = self.k.get(key)+
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        if isinstance(d, dict):+
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            if self.verbose:+
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                print "transition"+
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            self.stack.append(key)+
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            self.k = d+
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        else:+
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            if d is None:+
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                if self.verbose:+
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                    print "invalid"+
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                if self.stack or len(key) > 1 or (unicodedata.category(key) and unicodedata.category(key).startswith('C')):+
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                    self.results.append(+
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                        (self.invalid_cls, self.stack + [key]))+
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                else:+
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                    # small optimization:+
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                    self.k[key] = self.character_cls+
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                    self.results.append(+
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                        (self.character_cls, [key]))+
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            else:+
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                if self.verbose:+
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                    print "matched", d+
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                self.results.append((d, self.stack + [key]))+
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            self.stack = []+
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            self.k = self.ck+
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    def get(self):+
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        if self.results:+
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            return self.results.pop(0)+
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        else:+
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            return None+
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    def empty(self):+
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        return not self.results+
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