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3 <title>MayaChemTools:Documentation:Parsers::SimpleCalcYYLexer.pm</title>
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13 <div class="DocNav">
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14 <table width="100%" border=0 cellpadding=0 cellspacing=2>
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15 <tr align="left" valign="top"><td width="33%" align="left"><a href="./SimpleCalcParser.html" title="SimpleCalcParser.html">Previous</a> <a href="./index.html" title="Table of Contents">TOC</a> <a href="./YYLexer.html" title="YYLexer.html">Next</a></td><td width="34%" align="middle"><strong>Parsers::SimpleCalcYYLexer.pm</strong></td><td width="33%" align="right"><a href="././code/SimpleCalcYYLexer.html" title="View source code">Code</a> | <a href="./../pdf/SimpleCalcYYLexer.pdf" title="PDF US Letter Size">PDF</a> | <a href="./../pdfgreen/SimpleCalcYYLexer.pdf" title="PDF US Letter Size with narrow margins: www.changethemargins.com">PDFGreen</a> | <a href="./../pdfa4/SimpleCalcYYLexer.pdf" title="PDF A4 Size">PDFA4</a> | <a href="./../pdfa4green/SimpleCalcYYLexer.pdf" title="PDF A4 Size with narrow margins: www.changethemargins.com">PDFA4Green</a></td></tr>
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16 </table>
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17 </div>
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18 <p>
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19 </p>
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20 <h2>NAME</h2>
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21 <p>Parsers::SimpleCalcYYLexer</p>
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22 <p>
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23 </p>
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24 <h2>SYNOPSIS</h2>
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25 <p>use Parsers::SimpleCalcYYLexer;</p>
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26 <p>use Parsers::SimpleCalcYYLexer qw(:all);</p>
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27 <p>
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28 </p>
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29 <h2>DESCRIPTION</h2>
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30 <p><strong>SimpleCalcYYLexer</strong> class provides the following methods:</p>
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31 <p> <a href="#new">new</a>, <a href="#yylex">YYLex</a>, <a href="#getyylex">GetYYLex</a>, <a href="#stringifysimplecalcyylexer">StringifySimpleCalcYYLexer</a>
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32 </p><p><strong>Parser::SimpleCalcYYLexer</strong> class is derived from <strong>Parser::YYLexer</strong> class, which in
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33 turn is derived from base class <strong>Parser::Lexer</strong> that provides all the underlying
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34 lexer functionality. <strong>SimpleCalcYYLexer</strong> class is designed to be used with
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35 <strong>yyparse</strong> code generated by running <strong>byacc</strong> on a parser defined using
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36 parser definition <strong>SimpleCalcParser.yy</strong> file.</p>
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37 <p>The parser package and token table files, <strong>SimpleCalcParser.pm</strong> and <strong>SimpleCalcParser.tab.ph</strong>,
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38 are automatically generated from parser grammar definition file, <strong>SimpleCalcParser.yy</strong>, using
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39 byacc available through perl-byacc1.8 modified with perl5-byacc-patches-0.5 for generation
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40 of object oriented parser:</p>
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41 <div class="OptionsBox">
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42 byacc -l -P -d -b SimpleCalcParser SimpleCalcParser.yy
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43 <br/> mv SimpleCalcParser.tab.pl SimpleCalcParser.pm</div>
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44 <p><strong>SimpleCalcYYLexer.pm</strong> class implements a lexer for a simple calculator and is provided
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45 to highlight usasge of <strong>YYLex</strong> through <strong>yyparse</strong>.</p>
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46 <p>The default specification of lexer tokens for <strong>SimpleCalcYYLexer.pm</strong> includes:</p>
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47 <div class="OptionsBox">
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48 @YYLexerTokensSpec = (
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49 <br/> [ 'LETTER', qr/[a-zA-Z]/ ],
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50 [ 'NUMBER', qr/\d+/ ],
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51 [ 'SPACE', qr/[ ]*/,
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52 <br/> sub { my($This, $TokenLabel, $MatchedText) = @_; return ''; }
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53 <br/> ],
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54 [ 'NEWLINE', qr/(?:\r\n|\r|\n)/,
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55 <br/> sub { my($This, $TokenLabel, $MatchedText) = @_; return "\n"; }
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56 <br/> ],
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57 [ 'CHAR', qr/./ ]
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58 <br/> );</div>
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59 <p>The default <strong>SimpleCalcParser.tab.ph</strong> file containing token identifiers for
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60 <strong>SimpleCalcParser.yy</strong> includes:</p>
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61 <div class="OptionsBox">
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62 $NUMBER=257;
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63 <br/> $LETTER=258;</div>
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64 <p>
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65 </p>
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66 <h2>METHODS</h2>
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67 <dl>
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68 <dt><strong><a name="new" class="item"><strong>new</strong></a></strong></dt>
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69 <dd>
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70 <div class="OptionsBox">
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71 $SimpleCalcYYLexer = new Parsers::SimpleCalcYYLexer($Input);</div>
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72 <p>Using specified <em>Input</em>, <strong>new</strong> method generates a new <strong>SimpleCalcYYLexer</strong>
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73 and returns a reference to newly created <strong>SimpleCalcYYLexer</strong> object.</p>
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74 <p>Examples:</p>
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75 <div class="OptionsBox">
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76 # Input string...
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77 <br/> $InputText = "3 + 4 +6\nx=3\ny=5\nx+y\nx+z\n";</div>
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78 <div class="OptionsBox">
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79 $YYLexer = new Parsers::SimpleCalcYYLexer($InputText);
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80 <br/> $YYLex = $YYLexer->GetYYLex();</div>
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81 <div class="OptionsBox">
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82 $Debug = 0;
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83 <br/> $CalcParser = new Parsers::SimpleCalcParser($YYLex,
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84 \&Parsers::SimpleCalcParser::yyerror, $Debug);
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85 <br/> $Value = $SimpleCalcParser->yyparse();
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86 <br/> print "Value: $Value\n";</div>
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87 <div class="OptionsBox">
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88 # Input file...
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89 <br/> $InputFile = "Input.txt";
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90 <br/> open INPUTFILE, "$InputFile" or die "Couldn't open $InputFile: $!\n";
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91 <br/> $YYLexer = new Parsers::SimpleCalcYYLexer($InputFile);
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92 <br/> $YYLex = $YYLexer->GetYYLex();</div>
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93 <div class="OptionsBox">
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94 $CalcParser = new Parsers::SimpleCalcParser($YYLex,
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95 \&Parsers::SimpleCalcParser::yyerror);
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96 <br/> $Value = $SimpleCalcParser->yyparse();
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97 <br/> print "Value: $Value\n";</div>
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98 <div class="OptionsBox">
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99 # Input file iterator...
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100 <br/> $InputFile = "TestSimpleCalcParser.txt";
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101 <br/> open INPUTFILE, "$InputFile" or die "Couldn't open $InputFile: $!\n";
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102 <br/> $InputIterator = sub { return <INPUTFILE>; };
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103 <br/> $YYLexer = new Parsers::SimpleCalcYYLexer($InputIterator);
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104 <br/> $YYLex = $YYLexer->GetYYLex();</div>
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105 <div class="OptionsBox">
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106 $CalcParser = new Parsers::SimpleCalcParser($YYLex,
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107 \&Parsers::SimpleCalcParser::yyerror);
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108 <br/> $Value = $SimpleCalcParser->yyparse();
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109 <br/> print "Value: $Value\n";</div>
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110 </dd>
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111 <dt><strong><a name="stringifysimplecalcyylexer" class="item"><strong>StringifySimpleCalcYYLexer</strong></a></strong></dt>
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112 <dd>
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113 <div class="OptionsBox">
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114 $YYLexerString = $YYLexer->StringifySimpleCalcYYLexer();</div>
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115 <p>Returns a string containing information about <em>YYLexer</em> object.</p>
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116 </dd>
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117 </dl>
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118 <p>
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119 </p>
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120 <h2>AUTHOR</h2>
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121 <p><a href="mailto:msud@san.rr.com">Manish Sud</a></p>
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122 <p>
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123 </p>
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124 <h2>SEE ALSO</h2>
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125 <p><a href="./Lexer.html">Lexer.pm</a>, <a href="./YYLexer.html">YYLexer.pm</a>, <a href="./SimpleCalcParser.html">SimpleCalcParser.yy</a>
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126 </p>
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127 <p>
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128 </p>
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129 <h2>COPYRIGHT</h2>
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130 <p>Copyright (C) 2015 Manish Sud. All rights reserved.</p>
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131 <p>This file is part of MayaChemTools.</p>
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132 <p>MayaChemTools is free software; you can redistribute it and/or modify it under
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133 the terms of the GNU Lesser General Public License as published by the Free
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134 Software Foundation; either version 3 of the License, or (at your option)
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135 any later version.</p>
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136 <p> </p><p> </p><div class="DocNav">
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137 <table width="100%" border=0 cellpadding=0 cellspacing=2>
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138 <tr align="left" valign="top"><td width="33%" align="left"><a href="./SimpleCalcParser.html" title="SimpleCalcParser.html">Previous</a> <a href="./index.html" title="Table of Contents">TOC</a> <a href="./YYLexer.html" title="YYLexer.html">Next</a></td><td width="34%" align="middle"><strong>March 29, 2015</strong></td><td width="33%" align="right"><strong>Parsers::SimpleCalcYYLexer.pm</strong></td></tr>
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139 </table>
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140 </div>
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141 <br />
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142 <center>
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143 <img src="../../images/h2o2.png">
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