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.\" ========================================================================
.\"
.IX Title "SIMPLECALCYYLEXER 1"
.TH SIMPLECALCYYLEXER 1 "2015-03-29" "perl v5.14.2" "MayaChemTools"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Parsers::SimpleCalcYYLexer
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
use Parsers::SimpleCalcYYLexer;
.PP
use Parsers::SimpleCalcYYLexer qw(:all);
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSimpleCalcYYLexer\fR class provides the following methods:
.PP
new, YYLex, GetYYLex, StringifySimpleCalcYYLexer
.PP
\&\fBParser::SimpleCalcYYLexer\fR class is derived from \fBParser::YYLexer\fR class, which in
turn is derived from base class \fBParser::Lexer\fR that provides all the underlying
lexer functionality. \fBSimpleCalcYYLexer\fR class is designed to be used with
\&\fByyparse\fR code generated by running \fBbyacc\fR on a parser defined using
parser definition \fBSimpleCalcParser.yy\fR file.
.PP
The parser package and token table files, \fBSimpleCalcParser.pm\fR and \fBSimpleCalcParser.tab.ph\fR,
are automatically generated from parser grammar definition file, \fBSimpleCalcParser.yy\fR, using
byacc available through perl\-byacc1.8 modified with perl5\-byacc\-patches\-0.5 for generation
of object oriented parser:
.PP
.Vb 2
\&    byacc \-l \-P \-d \-b SimpleCalcParser SimpleCalcParser.yy
\&    mv SimpleCalcParser.tab.pl SimpleCalcParser.pm
.Ve
.PP
\&\fBSimpleCalcYYLexer.pm\fR class implements a lexer for a simple calculator and is provided
to highlight usasge of \fBYYLex\fR through \fByyparse\fR.
.PP
The default specification of lexer tokens for \fBSimpleCalcYYLexer.pm\fR includes:
.PP
.Vb 11
\&    @YYLexerTokensSpec = (
\&        [ \*(AqLETTER\*(Aq, qr/[a\-zA\-Z]/ ],
\&        [ \*(AqNUMBER\*(Aq, qr/\ed+/ ],
\&        [ \*(AqSPACE\*(Aq, qr/[ ]*/,
\&            sub { my($This, $TokenLabel, $MatchedText) = @_; return \*(Aq\*(Aq; }
\&        ],
\&        [ \*(AqNEWLINE\*(Aq, qr/(?:\er\en|\er|\en)/,
\&            sub { my($This, $TokenLabel, $MatchedText) = @_;  return "\en"; }
\&        ],
\&        [ \*(AqCHAR\*(Aq, qr/./ ]
\&    );
.Ve
.PP
The default \fBSimpleCalcParser.tab.ph\fR file containing token identifiers for
\&\fBSimpleCalcParser.yy\fR includes:
.PP
.Vb 2
\&    $NUMBER=257;
\&    $LETTER=258;
.Ve
.SS "\s-1METHODS\s0"
.IX Subsection "METHODS"
.IP "\fBnew\fR" 4
.IX Item "new"
.Vb 1
\&    $SimpleCalcYYLexer = new Parsers::SimpleCalcYYLexer($Input);
.Ve
.Sp
Using specified \fIInput\fR, \fBnew\fR method generates a new \fBSimpleCalcYYLexer\fR
and returns a reference to newly created \fBSimpleCalcYYLexer\fR object.
.Sp
Examples:
.Sp
.Vb 2
\&    # Input string...
\&    $InputText = "3 + 4 +6\enx=3\eny=5\enx+y\enx+z\en";
\&
\&    $YYLexer = new Parsers::SimpleCalcYYLexer($InputText);
\&    $YYLex = $YYLexer\->GetYYLex();
\&
\&    $Debug = 0;
\&    $CalcParser = new Parsers::SimpleCalcParser($YYLex,
\&                            \e&Parsers::SimpleCalcParser::yyerror, $Debug);
\&    $Value = $SimpleCalcParser\->yyparse();
\&    print "Value: $Value\en";
\&
\&    # Input file...
\&    $InputFile = "Input.txt";
\&    open INPUTFILE, "$InputFile" or die "Couldn\*(Aqt open $InputFile: $!\en";
\&    $YYLexer = new Parsers::SimpleCalcYYLexer($InputFile);
\&    $YYLex = $YYLexer\->GetYYLex();
\&
\&    $CalcParser = new Parsers::SimpleCalcParser($YYLex,
\&                            \e&Parsers::SimpleCalcParser::yyerror);
\&    $Value = $SimpleCalcParser\->yyparse();
\&    print "Value: $Value\en";
\&
\&    # Input file iterator...
\&    $InputFile = "TestSimpleCalcParser.txt";
\&    open INPUTFILE, "$InputFile" or die "Couldn\*(Aqt open $InputFile: $!\en";
\&    $InputIterator = sub { return <INPUTFILE>; };
\&    $YYLexer = new Parsers::SimpleCalcYYLexer($InputIterator);
\&    $YYLex = $YYLexer\->GetYYLex();
\&
\&    $CalcParser = new Parsers::SimpleCalcParser($YYLex,
\&                            \e&Parsers::SimpleCalcParser::yyerror);
\&    $Value = $SimpleCalcParser\->yyparse();
\&    print "Value: $Value\en";
.Ve
.IP "\fBStringifySimpleCalcYYLexer\fR" 4
.IX Item "StringifySimpleCalcYYLexer"
.Vb 1
\&    $YYLexerString = $YYLexer\->StringifySimpleCalcYYLexer();
.Ve
.Sp
Returns a string containing information about \fIYYLexer\fR object.
.SH "AUTHOR"
.IX Header "AUTHOR"
Manish Sud <msud@san.rr.com>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Lexer.pm, YYLexer.pm, SimpleCalcParser.yy
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2015 Manish Sud. All rights reserved.
.PP
This file is part of MayaChemTools.
.PP
MayaChemTools is free software; you can redistribute it and/or modify it under
the terms of the \s-1GNU\s0 Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your option)
any later version.
author	deepakjadmin
date	Wed, 20 Jan 2016 11:55:01 -0500
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