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diff mayachemtools/docs/modules/man3/SimpleCalcParser.3 @ 0:73ae111cf86f draft
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| author | deepakjadmin |
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| date | Wed, 20 Jan 2016 11:55:01 -0500 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mayachemtools/docs/modules/man3/SimpleCalcParser.3 Wed Jan 20 11:55:01 2016 -0500 @@ -0,0 +1,267 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.22) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +Parsers::SimpleCalcParser +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +use Parsers::SimpleCalcParser ; +.PP +use Parsers::SimpleCalcParser qw(:all); +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fBParsers::SimpleCalcParser\fR class provides the following methods: +.PP +new, yyclearin, yyerrok, yyerror, yyparse +.PP +\&\fBParsers::SimpleCalcParse.yy\fR parser grammer definition file implements a simple +calculator and is provided to highlight usage of lexer capability available through +\&\fBParsers::SimpleCalcYYLexer\fR, which in turn uses \fBParsers::YYLexer\fR and +\&\fBParsers::Lexer\fR classes to procide underlying lexer functionality. +.PP +The parser package and token table files, \fBParsers::SimpleCalcParser.pm\fR and +\&\fBSimpleCalcParser.tab.ph\fR, are automatically generated from parser grammar definition +file, \fBParsers::SimpleCalcParser.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 +.SS "\s-1METHODS\s0" +.IX Subsection "METHODS" +.IP "\fBnew\fR" 4 +.IX Item "new" +.Vb 4 +\& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex, +\& \e&Parsers::SimpleCalcParser::yyerror); +\& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex, +\& \e&Parsers::SimpleCalcParser::yyerror, $Debug); +.Ve +.Sp +Using specified \fIYYLex\fR \fIYYError\fR functions, \fBnew\fR method generates a new +\&\fBSimpleCalcParser\fR and returns a reference to newly created \fBSimpleCalcYYParser\fR object. +.Sp +Examples: +.Sp +.Vb 4 +\& # 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; +\& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex, +\& \e&Parsers::SimpleCalcParser::yyerror, $Debug); +\& $Value = $SimpleCalcParser\->yyparse(); +\& print "Value = " . (defined($Value) ? "$Value" : "Undefined") . "\en"; +\& +\& # Input file... +\& $InputFile = "TestSimpleCalcParser.txt"; +\& open INPUTFILE, "$InputFile" or die "Couldn\*(Aqt open $InputFile: $!\en"; +\& +\& $YYLexer = new Parsers::SimpleCalcYYLexer(\e*INPUTFILE); +\& $YYLex = $YYLexer\->GetYYLex(); +\& +\& $Debug = 0; +\& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex, +\& \e&Parsers::SimpleCalcParser::yyerror, $Debug); +\& $Value = $SimpleCalcParser\->yyparse(); +\& print "Value = " . (defined($Value) ? "$Value" : "Undefined") . "\en"; +\& +\& close INPUTFILE; +\& +\& # Input 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(); +\& +\& $Debug = 0; +\& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex, +\& \e&Parsers::SimpleCalcParser::yyerror, $Debug); +\& $Value = $SimpleCalcParser\->yyparse(); +\& print "Value = " . (defined($Value) ? "$Value" : "Undefined") . "\en"; +\& +\& close INPUTFILE; +.Ve +.IP "\fByyclearin\fR" 4 +.IX Item "yyclearin" +.Vb 1 +\& $SimpleCalcParser\->yyclearin(); +.Ve +.Sp +\&\fByyclearin\fR method clears any previous look-ahead token after encountering a syntax error +during parsing. It can be used after \fByyerrok\fR in a grammer rule with the reserved word +\&\fBerror\fR. +.IP "\fByyerrok\fR" 4 +.IX Item "yyerrok" +.Vb 1 +\& $SimpleCalcParser\->yyerrok(); +.Ve +.Sp +\&\fByyerrok\fR method is used with the reserved word \fBerror\fR in grammer rule to indcate +error recovery is complete after encountering a syntax error during parsing. +.IP "\fByyerror\fR" 4 +.IX Item "yyerror" +.Vb 1 +\& $SimpleCalcParser\->yyerror(); +.Ve +.Sp +\&\fByyerror\fR function is provided for the caller to use during initialization of a parser. It +is used by \fByyparse\fR to print any error messages encountered during parsing of the +input. +.IP "\fByyparse\fR" 4 +.IX Item "yyparse" +.Vb 1 +\& $Value = $SimpleCalcParser\->yyparse(); +.Ve +.Sp +Returns \fIValue\fR after parsing all the input from a input stream using specified +grammer rules. +.SH "AUTHOR" +.IX Header "AUTHOR" +Manish Sud <msud@san.rr.com> +.SH "SEE ALSO" +.IX Header "SEE ALSO" +Lexer.pm, YYLexer.pm, SimpleCalcYYLexer.pm +.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.