'\"
'\" Generated from file '/usr/obj/ports/tcllib-1.11.1/tcllib-1.11.1/modules/term/term_bind.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>
'\"
'\" The definitions below are for supplemental macros used in Tcl/Tk
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.TH "term::receive::bind" n 0.1 term "Terminal control"
.BS
.SH NAME
term::receive::bind \- Keyboard dispatch from terminals
.SH SYNOPSIS
package require \fBTcl  8.4\fR
.sp
package require \fBterm::receive::bind  ?0.1?\fR
.sp
\fBterm::receive::bind\fR \fIobject\fR ?\fImap\fR?
.sp
\fIobject\fR \fBmap\fR \fIstr\fR \fIcmd\fR
.sp
\fIobject\fR \fBdefault\fR \fIcmd\fR
.sp
\fIobject\fR \fBlisten\fR ?\fIchan\fR?
.sp
\fIobject\fR \fBunlisten\fR ?\fIchan\fR?
.sp
\fIobject\fR \fBreset\fR
.sp
\fIobject\fR \fBnext\fR \fIchar\fR
.sp
\fIobject\fR \fBprocess\fR \fIstr\fR
.sp
\fIobject\fR \fBeof\fR
.sp
.BE
.SH 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.
.SH "CLASS API"
The package exports a single command, the
class command, enabling the creation of
dispatcher instances. Its API
is:
.TP
\fBterm::receive::bind\fR \fIobject\fR ?\fImap\fR?
This command creates a new dispatcher object with the name
\fIobject\fR, initializes it, and returns the fully qualified name of
the object command as its result.
.sp
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.
.PP
.SH "OBJECT API"
The objects created by the class command provide the methods listed
below:
.TP
\fIobject\fR \fBmap\fR \fIstr\fR \fIcmd\fR
This method adds an additional mapping from the string \fIstr\fR to
the action \fIcmd\fR. The mapping will take effect immediately
should the processor be in a prefix of \fIstr\fR, 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.
.TP
\fIobject\fR \fBdefault\fR \fIcmd\fR
This method defines a default action \fIcmd\fR 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 \fBmap\fR.
.TP
\fIobject\fR \fBlisten\fR ?\fIchan\fR?
This methods sets up a filevent listener for the channel with handle
\fIchan\fR and invokes the dispatcher object whenever characters have
been received, or EOF was reached.
.sp
If not specified \fIchan\fR defaults to \fBstdin\fR.
.TP
\fIobject\fR \fBunlisten\fR ?\fIchan\fR?
This methods removes the filevent listener for the channel with handle
\fIchan\fR.
.sp
If not specified \fIchan\fR defaults to \fBstdin\fR.
.TP
\fIobject\fR \fBreset\fR
This method resets the character processor
to the beginning of the tree.
.TP
\fIobject\fR \fBnext\fR \fIchar\fR
This method causes the character processor to process the character
\fIc\fR. This may simply advance the internal state, or invoke an
associated action for a recognized sequence.
.TP
\fIobject\fR \fBprocess\fR \fIstr\fR
This method causes the character processor to process the character
sequence \fIstr\fR, advancing the internal state and invoking action
as necessary. This is a callback for \fBlisten\fR.
.TP
\fIobject\fR \fBeof\fR
This method causes the character processor to handle EOF on the
input. This is currently no-op.
This is a callback for \fBlisten\fR.
.PP
.SH 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.
.PP
In other words, the set of recognized strings has to form a
\fIprefix code\fR.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems.
Please report such in the category \fIterm\fR of the
\fITcllib SF Trackers\fR [http://sourceforge.net/tracker/?group_id=12883].
Please also report any ideas for enhancements you may have for either
package and/or documentation.
.SH KEYWORDS
character input, control, dispatcher, listener, receiver, terminal
.SH COPYRIGHT
.nf
Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>

.fi