Provided by: tcllib_1.19-dfsg-2_all 
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.
When proposing code changes, please provide unified diffs, i.e the output of diff -u.
Note further that attachments are strongly preferred over inlined patches. Attachments can be made by
going to the Edit form of the ticket immediately after its creation, and then using the left-most button
in the secondary navigation bar.
KEYWORDS
character input, control, dispatcher, listener, receiver, terminal
CATEGORY
Terminal control
COPYRIGHT
Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>