'\"
'\" Generated from file 'dacceptor\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2004 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>
'\"
.TH "grammar::fa::dacceptor" n 0\&.1\&.2 tcllib "Finite automaton operations and usage"
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.SH NAME
grammar::fa::dacceptor \- Create and use deterministic acceptors
.SH SYNOPSIS
package require \fBTcl 8\&.5 9\fR
.sp
package require \fBsnit\fR
.sp
package require \fBstruct::set\fR
.sp
package require \fBgrammar::fa::dacceptor ?0\&.1\&.2?\fR
.sp
\fB::grammar::fa::dacceptor\fR \fIdaName\fR \fIfa\fR ?\fB-any\fR \fIany\fR?
.sp
\fBdaName\fR \fIoption\fR ?\fIarg arg \&.\&.\&.\fR?
.sp
\fIdaName\fR \fBdestroy\fR
.sp
\fIdaName\fR \fBaccept?\fR \fIsymbols\fR
.sp
.BE
.SH DESCRIPTION
.PP
This package provides a class for acceptors constructed from
deterministic \fIfinite automatons\fR (DFA)\&. Acceptors are objects
which can be given a string of symbols and tell if the DFA they are
constructed from would \fIaccept\fR that string\&.
For the actual creation of the DFAs the acceptors are based on we have
the packages \fBgrammar::fa\fR and \fBgrammar::fa::op\fR\&.
.PP
.SH API
The package exports the API described here\&.
.TP
\fB::grammar::fa::dacceptor\fR \fIdaName\fR \fIfa\fR ?\fB-any\fR \fIany\fR?
Creates a new deterministic acceptor with an associated global Tcl command
whose name is \fIdaName\fR\&. This command may be used to invoke various
operations on the acceptor\&. It has the following general form:
.RS
.TP
\fBdaName\fR \fIoption\fR ?\fIarg arg \&.\&.\&.\fR?
\fIOption\fR and the \fIarg\fRs determine the exact behavior of the
command\&. See section \fBACCEPTOR METHODS\fR for more explanations\&.
.sp
The acceptor will be based on the deterministic finite automaton
stored in the object \fIfa\fR\&. It will keep a copy of the relevant
data of the FA in its own storage, in a form easy to use for its
purposes\&. This also means that changes made to the \fIfa\fR after the
construction of the acceptor \fIwill not\fR influence the acceptor\&.
.sp
If \fIany\fR has been specified, then the acceptor will convert all
symbols in the input which are unknown to the base FA to that symbol
before proceeding with the processing\&.
.RE
.PP
.SH "ACCEPTOR METHODS"
.PP
All acceptors provide the following methods for their manipulation:
.TP
\fIdaName\fR \fBdestroy\fR
Destroys the automaton, including its storage space and associated
command\&.
.TP
\fIdaName\fR \fBaccept?\fR \fIsymbols\fR
Takes the list of \fIsymbols\fR and checks if the FA the acceptor is
based on would accept it\&. The result is a boolean value\&. \fBTrue\fR
is returned if the symbols are accepted, and \fBFalse\fR
otherwise\&. Note that bogus symbols in the input are either translated
to the \fIany\fR symbol (if specified), or cause the acceptance test
to simply fail\&. No errors will be thrown\&. The method will process only
just that prefix of the input which is enough to fully determine
(non-)acceptance\&.
.PP
.PP
.SH EXAMPLES
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIgrammar_fa\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH KEYWORDS
acceptance, acceptor, automaton, finite automaton, grammar, parsing, regular expression, regular grammar, regular languages, state, transducer
.SH CATEGORY
Grammars and finite automata
.SH COPYRIGHT
.nf
Copyright (c) 2004 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>

.fi
