Ubuntu Manpage: term::receive::bind - Keyboard dispatch from terminals

NAME

       term::receive::bind - Keyboard dispatch from terminals

SYNOPSIS

       package require Tcl  8.4

       package require term::receive::bind  ?0.1?

       term::receive::bind object ?map?

       object map str cmd

       object default cmd

       object listen ?chan?

       object unlisten ?chan?

       object reset

       object next char

       object process str

       object eof

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DESCRIPTION

       This  package  provides  a  class  for  the  creation of simple dispatchers from character
       sequences to actions. Internally each dispatcher is  in  essence  a  deterministic  finite
       automaton with tree structure.

CLASS API

       The  package  exports  a  single  command,  the  class  command,  enabling the creation of
       dispatcher instances. Its API is:

       term::receive::bind object ?map?
              This command creates a new dispatcher object with the name object, initializes  it,
              and returns the fully qualified name of the object command as its result.

              The  argument is a dictionary mapping from strings, i.e. character sequences to the
              command prefices to invoke when the sequence is found in the input stream.

OBJECT API

The objects created by the class command provide the methods listed below:

object map str cmd
This method adds an additional mapping from the string str to the action cmd. The
mapping will take effect immediately should the processor be in a prefix of str, or
at the next reset operation. The action is a command prefix and will be invoked
with one argument appended to it, the character sequence causing the invokation. It
is executed in the global namespace.

object default cmd
This method defines a default action cmd which will be invoked whenever an unknown
character sequence is encountered. The command prefix is handled in the same as the
regular action defined via method map.

object listen ?chan?
This methods sets up a filevent listener for the channel with handle chan and
invokes the dispatcher object whenever characters have been received, or EOF was
reached.

If not specified chan defaults to stdin.

object unlisten ?chan?
This methods removes the filevent listener for the channel with handle chan.

If not specified chan defaults to stdin.

object reset
This method resets the character processor to the beginning of the tree.

object next char
This method causes the character processor to process the character c. This may
simply advance the internal state, or invoke an associated action for a recognized
sequence.

object process str
This method causes the character processor to process the character sequence str,
advancing the internal state and invoking action as necessary. This is a callback
for listen.

object eof
This method causes the character processor to handle EOF on the input. This is
currently no-op. This is a callback for listen.

NOTES

       The  simplicity of the DFA means that it is not possible to recognize a character sequence
       with has a another recognized character sequence as its prefix.

       In other words, the set of recognized strings has to form a prefix code.

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.    Please   report   such   in   the   category  term  of  the  Tcllib  Trackers
       [http://core.tcl.tk/tcllib/reportlist].  Please also report any ideas for enhancements you
       may have for either package and/or documentation.

KEYWORDS

       character input, control, dispatcher, listener, receiver, terminal

COPYRIGHT

       Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>