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1 <html>
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2 <head>
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3 <title>MayaChemTools:Code:Parsers::YYLexer.pm</title>
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4 <meta http-equiv="content-type" content="text/html;charset=utf-8">
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5 <link rel="stylesheet" type="text/css" href="../../../css/MayaChemToolsCode.css">
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6 </head>
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7 <body leftmargin="20" rightmargin="20" topmargin="10" bottommargin="10">
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8 <br/>
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9 <center>
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10 <a href="http://www.mayachemtools.org" title="MayaChemTools Home"><img src="../../../images/MayaChemToolsLogo.gif" border="0" alt="MayaChemTools"></a>
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11 </center>
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12 <br/>
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13 <pre>
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14 <a name="package-Parsers::YYLexer-"></a> 1 <span class="k">package </span><span class="i">Parsers::YYLexer</span><span class="sc">;</span>
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15 2 <span class="c">#</span>
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16 3 <span class="c"># $RCSfile: YYLexer.pm,v $</span>
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17 4 <span class="c"># $Date: 2015/02/28 20:50:55 $</span>
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18 5 <span class="c"># $Revision: 1.10 $</span>
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19 6 <span class="c">#</span>
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20 7 <span class="c"># Author: Manish Sud &lt;msud@san.rr.com&gt;</span>
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21 8 <span class="c">#</span>
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22 9 <span class="c"># Copyright (C) 2015 Manish Sud. All rights reserved.</span>
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23 10 <span class="c">#</span>
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24 11 <span class="c"># This file is part of MayaChemTools.</span>
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25 12 <span class="c">#</span>
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26 13 <span class="c"># MayaChemTools is free software; you can redistribute it and/or modify it under</span>
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27 14 <span class="c"># the terms of the GNU Lesser General Public License as published by the Free</span>
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28 15 <span class="c"># Software Foundation; either version 3 of the License, or (at your option) any</span>
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29 16 <span class="c"># later version.</span>
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30 17 <span class="c">#</span>
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31 18 <span class="c"># MayaChemTools is distributed in the hope that it will be useful, but without</span>
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32 19 <span class="c"># any warranty; without even the implied warranty of merchantability of fitness</span>
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33 20 <span class="c"># for a particular purpose. See the GNU Lesser General Public License for more</span>
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34 21 <span class="c"># details.</span>
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35 22 <span class="c">#</span>
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36 23 <span class="c"># You should have received a copy of the GNU Lesser General Public License</span>
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37 24 <span class="c"># along with MayaChemTools; if not, see &lt;http://www.gnu.org/licenses/&gt; or</span>
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38 25 <span class="c"># write to the Free Software Foundation Inc., 59 Temple Place, Suite 330,</span>
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39 26 <span class="c"># Boston, MA, 02111-1307, USA.</span>
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40 27 <span class="c">#</span>
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41 28
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42 29 <span class="k">use</span> <span class="w">strict</span><span class="sc">;</span>
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43 30 <span class="k">use</span> <span class="w">Carp</span><span class="sc">;</span>
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44 31 <span class="k">use</span> <span class="w">Exporter</span><span class="sc">;</span>
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45 32 <span class="k">use</span> <span class="w">Scalar::Util</span> <span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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46 33 <span class="k">use</span> <span class="w">Parsers::Lexer</span><span class="sc">;</span>
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47 34
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48 35 <span class="k">use</span> <span class="w">vars</span> <span class="q">qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS)</span><span class="sc">;</span>
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49 36
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50 37 <span class="i">@ISA</span> = <span class="q">qw(Parsers::Lexer Exporter)</span><span class="sc">;</span>
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51 38 <span class="i">@EXPORT</span> = <span class="q">qw()</span><span class="sc">;</span>
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52 39 <span class="i">@EXPORT_OK</span> = <span class="q">qw()</span><span class="sc">;</span>
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53 40
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54 41 <span class="i">%EXPORT_TAGS</span> = <span class="s">(</span><span class="w">all</span> <span class="cm">=&gt;</span> <span class="s">[</span><span class="i">@EXPORT</span><span class="cm">,</span> <span class="i">@EXPORT_OK</span><span class="s">]</span><span class="s">)</span><span class="sc">;</span>
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55 42
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56 43 <span class="c"># Setup class variables...</span>
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57 44 <span class="k">my</span><span class="s">(</span><span class="i">$ClassName</span><span class="s">)</span><span class="sc">;</span>
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58 45 <span class="i">_InitializeClass</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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59 46
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60 47 <span class="c"># Overload Perl functions...</span>
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61 48 <span class="k">use</span> <span class="w">overload</span> <span class="q">&#39;&quot;&quot;&#39;</span> <span class="cm">=&gt;</span> <span class="q">&#39;StringifyYYLexer&#39;</span><span class="sc">;</span>
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62 49
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63 50 <span class="c"># Class constructor...</span>
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64 <a name="new-"></a> 51 <span class="k">sub </span><span class="m">new</span> <span class="s">{</span>
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65 52 <span class="k">my</span><span class="s">(</span><span class="i">$Class</span><span class="cm">,</span> <span class="i">$Input</span><span class="cm">,</span> <span class="i">@TokensSpec</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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66 53
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67 54 <span class="c"># Initialize object...</span>
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68 55 <span class="k">my</span> <span class="i">$This</span> = <span class="i">$Class</span><span class="i">-&gt;SUPER::new</span><span class="s">(</span><span class="i">$Input</span><span class="cm">,</span> <span class="i">@TokensSpec</span><span class="s">)</span><span class="sc">;</span>
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69 56 <span class="k">bless</span> <span class="i">$This</span><span class="cm">,</span> <span class="k">ref</span><span class="s">(</span><span class="i">$Class</span><span class="s">)</span> || <span class="i">$Class</span><span class="sc">;</span>
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70 57 <span class="i">$This</span><span class="i">-&gt;_InitializeYYLexer</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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71 58
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72 59 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span>
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73 60 <span class="s">}</span>
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74 61
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75 62 <span class="c"># Initialize object data...</span>
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76 63 <span class="c">#</span>
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77 <a name="_InitializeYYLexer-"></a> 64 <span class="k">sub </span><span class="m">_InitializeYYLexer</span> <span class="s">{</span>
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78 65 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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79 66
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80 67 <span class="c"># File generated containing mapping of token labels to token numbers by</span>
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81 68 <span class="c"># running command byacc with -d option on a parser definition file.</span>
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82 69 <span class="c">#</span>
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83 70 <span class="c"># For example, &quot;byacc -l -P -d -b Parser Parser.yy&quot; would generate file</span>
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84 71 <span class="c"># Parser.tab.ph, which might contain the following tokem name and values</span>
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85 72 <span class="c"># for a parser for a simple calculator:</span>
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86 73 <span class="c">#</span>
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87 74 <span class="c"># $NUMBER=257;</span>
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88 75 <span class="c"># $LETTER=258;</span>
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89 76 <span class="c">#</span>
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90 77 <span class="c">#</span>
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91 78 <span class="i">$This</span>-&gt;{<span class="w">YYTabFile</span>} = <span class="k">undef</span><span class="sc">;</span>
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92 79 <span class="i">$This</span>-&gt;{<span class="w">YYTabFilePath</span>} = <span class="k">undef</span><span class="sc">;</span>
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93 80
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94 81 <span class="c"># Mapping of token lables to token numbers...</span>
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95 82 <span class="i">%</span>{<span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}} = <span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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96 83
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97 84 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span>
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98 85 <span class="s">}</span>
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99 86
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100 87 <span class="c"># Initialize class ...</span>
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101 <a name="_InitializeClass-"></a> 88 <span class="k">sub </span><span class="m">_InitializeClass</span> <span class="s">{</span>
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102 89 <span class="c">#Class name...</span>
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103 90
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104 91 <span class="i">$ClassName</span> = <span class="w">__PACKAGE__</span><span class="sc">;</span>
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105 92 <span class="s">}</span>
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106 93
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107 94 <span class="c"># Process tokens in YYTab file and load mapping of token labels to integers</span>
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108 95 <span class="c"># for return during YYLex method invocation...</span>
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109 96 <span class="c">#</span>
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110 97 <span class="c"># Notes:</span>
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111 98 <span class="c"># . YYTabFile must be a complete path or available through @INC path in the</span>
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112 99 <span class="c"># same directory where this package is located.</span>
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113 100 <span class="c"># . Name of YYTabFile might start with any valid sub directory name in @INC</span>
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114 101 <span class="c"># For example, &quot;Parsers/&lt;YYTablFile&gt;&quot; implies the tab file in parsers sub directory</span>
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115 102 <span class="c"># under MayaChemTools lib directory as it would be already in @INC path.</span>
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116 103 <span class="c"># . YYTabFile must be explicitly set by the caller. The default YYTabFile name,</span>
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117 104 <span class="c"># y.tab.ph, generated by byacc is not used implicitly to avoid confusion among</span>
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118 105 <span class="c"># multiple distinct instances of YYLexer.</span>
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119 106 <span class="c"># . YYTabFile is generated by byacc during its usage with -d options and contains</span>
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120 107 <span class="c"># mapping of token codes to token names/labels. YYLexer used this file to map</span>
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121 108 <span class="c"># token lables to token codes before retuning token code and value pair back</span>
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122 109 <span class="c"># to yyparse function used by byacc.</span>
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123 110 <span class="c"># . User defined token numbers start from 257</span>
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124 111 <span class="c">#</span>
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125 112 <span class="c"># The format of YYTabFile generted by byacc during generation of parser code in</span>
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126 113 <span class="c"># Perl code is:</span>
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127 114 <span class="c">#</span>
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128 115 <span class="c"># ... ...</span>
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129 116 <span class="c"># $NUMBER=257;</span>
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130 117 <span class="c"># $ADDOP=258;</span>
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131 118 <span class="c"># $SUBOP=259;</span>
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132 119 <span class="c"># ... ..</span>
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133 120 <span class="c">#</span>
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134 <a name="SetupYYTabFile-"></a> 121 <span class="k">sub </span><span class="m">SetupYYTabFile</span> <span class="s">{</span>
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135 122 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$YYTabFile</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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136 123 <span class="k">my</span><span class="s">(</span><span class="i">$YYTabFilePath</span><span class="cm">,</span> <span class="i">$Line</span><span class="cm">,</span> <span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenNumber</span><span class="s">)</span><span class="sc">;</span>
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137 124
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138 125 <span class="i">$This</span>-&gt;{<span class="w">YYTabFile</span>} = <span class="k">undef</span><span class="sc">;</span>
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139 126 <span class="i">$This</span>-&gt;{<span class="w">YYTabFilePath</span>} = <span class="k">undef</span><span class="sc">;</span>
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140 127 <span class="i">%</span>{<span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}} = <span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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141 128
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142 129 <span class="k">if</span> <span class="s">(</span>!<span class="k">defined</span> <span class="i">$YYTabFile</span><span class="s">)</span> <span class="s">{</span>
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143 130 <span class="w">croak</span> <span class="q">&quot;Error: ${ClassName}-&gt;SetupYYTabFile: YYTabFile must be specified...&quot;</span><span class="sc">;</span>
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144 131 <span class="s">}</span>
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145 132 <span class="i">$This</span>-&gt;{<span class="w">YYTabFile</span>} = <span class="i">$YYTabFile</span><span class="sc">;</span>
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146 133
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147 134 <span class="k">if</span> <span class="s">(</span><span class="k">-e</span> <span class="i">$YYTabFile</span><span class="s">)</span> <span class="s">{</span>
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148 135 <span class="i">$YYTabFilePath</span> = <span class="i">$YYTabFile</span><span class="sc">;</span>
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149 136 <span class="s">}</span>
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150 137 <span class="k">else</span> <span class="s">{</span>
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151 138 <span class="s">(</span><span class="i">$YYTabFilePath</span><span class="s">)</span> = <span class="k">grep</span> <span class="s">{</span><span class="k">-f</span> <span class="q">&quot;$_/$YYTabFile&quot;</span><span class="s">}</span> <span class="i">@INC</span><span class="sc">;</span>
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152 139 <span class="k">if</span> <span class="s">(</span>!<span class="i">$YYTabFilePath</span><span class="s">)</span> <span class="s">{</span>
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153 140 <span class="w">carp</span> <span class="q">&quot;Warning: ${ClassName}-&gt;SetupYYTabFile: YYTabFile, $YYTabFile, can&#39;t be located in \@INC path: @INC...&quot;</span><span class="sc">;</span>
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154 141 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span>
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155 142 <span class="s">}</span>
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156 143 <span class="i">$YYTabFilePath</span> = <span class="q">&quot;${YYTabFilePath}/$YYTabFile&quot;</span><span class="sc">;</span>
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157 144 <span class="s">}</span>
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158 145
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159 146 <span class="i">$This</span>-&gt;{<span class="w">YYTabFilePath</span>} = <span class="i">$YYTabFilePath</span><span class="sc">;</span>
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160 147
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161 148 <span class="k">open</span> <span class="w">YYTABFILE</span><span class="cm">,</span> <span class="q">&quot;$YYTabFilePath&quot;</span> <span class="k">or</span> <span class="k">die</span> <span class="q">&quot;Couldn&#39;t open $YYTabFilePath: $_\n&quot;</span><span class="sc">;</span>
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162 149 <span class="k">while</span> <span class="s">(</span><span class="i">$Line</span> = <span class="q">&lt;YYTABFILE&gt;</span><span class="s">)</span> <span class="s">{</span>
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163 150 <span class="s">(</span><span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenNumber</span><span class="s">)</span> = <span class="s">(</span><span class="i">$Line</span> =~ <span class="q">/^\$(.*?)=(.*?);$/</span><span class="s">)</span><span class="sc">;</span>
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164 151 <span class="k">if</span> <span class="s">(</span>!<span class="s">(</span><span class="k">defined</span><span class="s">(</span><span class="i">$TokenLabel</span><span class="s">)</span> &amp;&amp; <span class="k">defined</span><span class="s">(</span><span class="i">$TokenNumber</span><span class="s">)</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span>
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165 152 <span class="w">croak</span> <span class="q">&quot;Error: ${ClassName}-&gt;SetupYYTabFile: Couldn&#39;t extract token label and number from YYTabFile $YYTabFile at line: $Line...&quot;</span><span class="sc">;</span>
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166 153 <span class="s">}</span>
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167 154 <span class="k">if</span> <span class="s">(</span><span class="k">exists</span> <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="i">$TokenLabel</span>}<span class="s">)</span> <span class="s">{</span>
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168 155 <span class="w">carp</span> <span class="q">&quot;Warning: ${ClassName}-&gt;SetupYYTabFile: Token lable, $TokenLabel, already defined in YYTabFile $YYTabFile...&quot;</span><span class="sc">;</span>
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169 156 <span class="s">}</span>
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170 157 <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="i">$TokenLabel</span>} = <span class="i">$TokenNumber</span><span class="sc">;</span>
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171 158 <span class="s">}</span>
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172 159 <span class="k">close</span> <span class="w">YYTABFILE</span><span class="sc">;</span>
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173 160
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174 161 <span class="k">return</span> <span class="i">$This</span><span class="sc">;</span>
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175 162 <span class="s">}</span>
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176 163
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177 164 <span class="c"># Get next available token number and any matched text from input stream</span>
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178 165 <span class="c"># by either removing it from the input stream or simply peeking ahead.</span>
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179 166 <span class="c">#</span>
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180 167 <span class="c"># Supported mode values: Peek, Next. Default: Next</span>
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181 168 <span class="c">#</span>
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182 169 <span class="c"># Notes:</span>
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183 170 <span class="c"># . Token label and value pairs returned by lexer, which can&#39;t be mapped to token</span>
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184 171 <span class="c"># labels specified in YYTabFile are ignored.</span>
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185 172 <span class="c"># . Token text of length 1 returned by lexer without a corresponding explicit token label,</span>
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186 173 <span class="c"># which can&#39;t be mapped to a token number using Perl ord function, is ignored.</span>
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187 174 <span class="c">#</span>
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188 <a name="YYLex-"></a> 175 <span class="k">sub </span><span class="m">YYLex</span> <span class="s">{</span>
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189 176 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="cm">,</span> <span class="i">$Mode</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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190 177 <span class="k">my</span><span class="s">(</span><span class="i">$LexerToken</span><span class="cm">,</span> <span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenNumber</span><span class="cm">,</span> <span class="i">$TokenText</span><span class="s">)</span><span class="sc">;</span>
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191 178
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192 179 <span class="s">(</span><span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenNumber</span><span class="cm">,</span> <span class="i">$TokenText</span><span class="s">)</span> = <span class="s">(</span><span class="k">undef</span><span class="s">)</span> x <span class="n">3</span><span class="sc">;</span>
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193 180
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194 181 <span class="j">TOKEN:</span> <span class="k">while</span> <span class="s">(</span><span class="k">defined</span><span class="s">(</span><span class="i">$LexerToken</span> = <span class="i">$This</span><span class="i">-&gt;Lex</span><span class="s">(</span><span class="i">$Mode</span><span class="s">)</span><span class="s">)</span><span class="s">)</span> <span class="s">{</span>
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195 182 <span class="k">if</span> <span class="s">(</span><span class="k">ref</span> <span class="i">$LexerToken</span><span class="s">)</span> <span class="s">{</span>
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196 183 <span class="s">(</span><span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenText</span><span class="s">)</span> = <span class="i">@</span>{<span class="i">$LexerToken</span>}<span class="sc">;</span>
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197 184 <span class="k">if</span> <span class="s">(</span><span class="k">exists</span> <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="i">$TokenLabel</span>}<span class="s">)</span> <span class="s">{</span>
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198 185 <span class="i">$TokenNumber</span> = <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="i">$TokenLabel</span>}<span class="sc">;</span>
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199 186 <span class="s">}</span>
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200 187 <span class="k">elsif</span> <span class="s">(</span><span class="i">$TokenLabel</span> =~ <span class="q">/^EOI$/i</span><span class="s">)</span> <span class="s">{</span>
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201 188 <span class="i">$TokenNumber</span> = <span class="n">0</span><span class="sc">;</span>
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202 189 <span class="s">}</span>
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203 190 <span class="s">}</span>
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204 191 <span class="k">else</span> <span class="s">{</span>
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205 192 <span class="i">$TokenText</span> = <span class="i">$LexerToken</span><span class="sc">;</span>
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206 193 <span class="s">}</span>
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207 194
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208 195 <span class="c"># Check for any literals (+, - , = etc.) to generte token numbers...</span>
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209 196 <span class="c">#</span>
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210 197 <span class="k">if</span> <span class="s">(</span>!<span class="k">defined</span> <span class="i">$TokenNumber</span><span class="s">)</span> <span class="s">{</span>
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211 198 <span class="k">if</span> <span class="s">(</span><span class="k">length</span><span class="s">(</span><span class="i">$TokenText</span><span class="s">)</span> == <span class="n">1</span> &amp;&amp; <span class="k">ord</span> <span class="i">$TokenText</span><span class="s">)</span> <span class="s">{</span>
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212 199 <span class="i">$TokenNumber</span> = <span class="k">ord</span> <span class="i">$TokenText</span><span class="sc">;</span>
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213 200 <span class="s">}</span>
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214 201 <span class="s">}</span>
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215 202
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216 203 <span class="c"># Generate error message for no mapping to token numbers...</span>
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217 204 <span class="k">if</span> <span class="s">(</span><span class="k">defined</span> <span class="i">$TokenNumber</span><span class="s">)</span> <span class="s">{</span>
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218 205 <span class="k">last</span> <span class="j">TOKEN</span><span class="sc">;</span>
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219 206 <span class="s">}</span>
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220 207 <span class="k">else</span> <span class="s">{</span>
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221 208 <span class="k">if</span> <span class="s">(</span><span class="k">defined</span> <span class="i">$TokenLabel</span><span class="s">)</span> <span class="s">{</span>
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222 209 <span class="w">carp</span> <span class="q">&quot;Warning: ${ClassName}-&gt;YYLex: Igorning token label, $TokenLabel, with matched text, $TokenText, returned by lexer and retrieving next available token or text. Token label couldn&#39;t be mapped to token numbers specified in YYTabFile generated from a parser defintion file using byacc. After updating parser definition file, a new YYTabFile containing entry for token label must be generated...&quot;</span><span class="sc">;</span>
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223 210 <span class="s">}</span>
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224 211 <span class="k">else</span> <span class="s">{</span>
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225 212 <span class="w">carp</span> <span class="q">&quot;Warning: ${ClassName}-&gt;YYLex: Igorning token text, $TokenText, returned by lexer and retrieving next available token or text. Token text returned by lexer couldn&#39;t be mapped to token number using Perl ord function. After updating lexer token specifications and parser definition file, a new YYTabFile containing entry for a new token label to match unrecognized text must be generated... &quot;</span><span class="sc">;</span>
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226 213 <span class="s">}</span>
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227 214 <span class="k">next</span> <span class="j">TOKEN</span><span class="sc">;</span>
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228 215 <span class="s">}</span>
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229 216 <span class="s">}</span>
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230 217
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231 218 <span class="k">if</span> <span class="s">(</span>!<span class="k">defined</span> <span class="i">$LexerToken</span><span class="s">)</span> <span class="s">{</span>
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232 219 <span class="c"># Chained lexer returns undefined at end of input. So it&#39;s equivalent to EOI</span>
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233 220 <span class="c"># token.</span>
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234 221 <span class="k">if</span> <span class="s">(</span><span class="k">exists</span> <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="w">EOI</span>}<span class="s">)</span> <span class="s">{</span>
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235 222 <span class="i">$TokenLabel</span> = <span class="q">&quot;EOI&quot;</span><span class="sc">;</span>
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236 223 <span class="i">$TokenNumber</span> = <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="i">$TokenLabel</span>}<span class="sc">;</span>
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237 224 <span class="i">$TokenText</span> = <span class="q">&quot;0&quot;</span><span class="sc">;</span>
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238 225 <span class="s">}</span>
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239 226 <span class="k">else</span> <span class="s">{</span>
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240 227 <span class="s">(</span><span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenNumber</span><span class="cm">,</span> <span class="i">$TokenText</span><span class="s">)</span> = <span class="s">(</span><span class="q">&quot;EOI&quot;</span><span class="cm">,</span> <span class="n">0</span><span class="cm">,</span> <span class="q">&quot;0&quot;</span><span class="s">)</span><span class="sc">;</span>
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241 228 <span class="s">}</span>
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242 229 <span class="s">}</span>
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243 230
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244 231 <span class="k">return</span> <span class="s">(</span><span class="i">$TokenNumber</span><span class="cm">,</span> <span class="i">$TokenText</span><span class="s">)</span><span class="sc">;</span>
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245 232 <span class="s">}</span>
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246 233
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247 234 <span class="c"># Get next available token number and text pair from input stream by removing it</span>
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248 235 <span class="c"># from the input stream...</span>
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249 236 <span class="c">#</span>
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250 <a name="Next-"></a> 237 <span class="k">sub </span><span class="m">Next</span> <span class="s">{</span>
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251 238 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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252 239
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253 240 <span class="k">return</span> <span class="i">$This</span><span class="i">-&gt;YYLex</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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254 241 <span class="s">}</span>
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255 242
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256 243 <span class="c"># Get next available token number and text pair from input stream by by simply</span>
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257 244 <span class="c"># peeking ahead and without removing it from the input stream...</span>
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258 245 <span class="c">#</span>
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259 <a name="Peek-"></a> 246 <span class="k">sub </span><span class="m">Peek</span> <span class="s">{</span>
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260 247 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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261 248
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262 249 <span class="k">return</span> <span class="i">$This</span><span class="i">-&gt;YYLex</span><span class="s">(</span><span class="q">&#39;Peek&#39;</span><span class="s">)</span>
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263 250 <span class="s">}</span>
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264 251
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265 252 <span class="c"># Return a curried verson of lexer: yyparse in parser generated by byacc expects it</span>
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266 253 <span class="c"># to call without passing any argument for the YYLexer object...</span>
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267 254 <span class="c">#</span>
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268 <a name="GetYYLex-"></a> 255 <span class="k">sub </span><span class="m">GetYYLex</span> <span class="s">{</span>
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269 256 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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270 257
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271 258 <span class="k">return</span> <span class="k">sub</span> <span class="s">{</span> <span class="k">my</span><span class="s">(</span><span class="i">$Mode</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span> <span class="i">$This</span><span class="i">-&gt;YYLex</span><span class="s">(</span><span class="i">$Mode</span><span class="s">)</span><span class="sc">;</span> <span class="s">}</span><span class="sc">;</span>
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272 259 <span class="s">}</span>
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273 260
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274 261 <span class="c"># Is it a lexer object?</span>
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275 <a name="_IsYYLexer-"></a> 262 <span class="k">sub </span><span class="m">_IsYYLexer</span> <span class="s">{</span>
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276 263 <span class="k">my</span><span class="s">(</span><span class="i">$Object</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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277 264
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278 265 <span class="k">return</span> <span class="s">(</span><span class="i">Scalar::Util::blessed</span><span class="s">(</span><span class="i">$Object</span><span class="s">)</span> &amp;&amp; <span class="i">$Object</span><span class="i">-&gt;isa</span><span class="s">(</span><span class="i">$ClassName</span><span class="s">)</span><span class="s">)</span> ? <span class="n">1</span> <span class="co">:</span> <span class="n">0</span><span class="sc">;</span>
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279 266 <span class="s">}</span>
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280 267
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281 268 <span class="c"># Return a string containing information about lexer...</span>
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282 <a name="StringifyYYLexer-"></a> 269 <span class="k">sub </span><span class="m">StringifyYYLexer</span> <span class="s">{</span>
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283 270 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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284 271 <span class="k">my</span><span class="s">(</span><span class="i">$YYLexerString</span><span class="s">)</span><span class="sc">;</span>
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285 272
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286 273 <span class="i">$YYLexerString</span> = <span class="q">&quot;YYLexer: PackageName: $ClassName; &quot;</span> . <span class="i">$This</span><span class="i">-&gt;_GetYYLexerInfoString</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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287 274
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288 275 <span class="k">return</span> <span class="i">$YYLexerString</span><span class="sc">;</span>
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289 276 <span class="s">}</span>
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290 277
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291 278 <span class="c"># Stringigy YYTabFile token name and value information...</span>
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292 279 <span class="c">#</span>
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293 <a name="_GetYYLexerInfoString-"></a> 280 <span class="k">sub </span><span class="m">_GetYYLexerInfoString</span> <span class="s">{</span>
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294 281 <span class="k">my</span><span class="s">(</span><span class="i">$This</span><span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
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295 282 <span class="k">my</span><span class="s">(</span><span class="i">$YYLexerInfoString</span><span class="cm">,</span> <span class="i">$TokenValue</span><span class="cm">,</span> <span class="i">$YYTabFile</span><span class="cm">,</span> <span class="i">$YYTabFilePath</span><span class="cm">,</span> <span class="i">$YYTabDataMapString</span><span class="s">)</span><span class="sc">;</span>
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296 283
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297 284 <span class="i">$YYTabFile</span> = <span class="k">defined</span> <span class="i">$This</span>-&gt;{<span class="w">YYTabFile</span>} ? <span class="i">$This</span>-&gt;{<span class="w">YYTabFile</span>} <span class="co">:</span> <span class="q">&#39;None&#39;</span><span class="sc">;</span>
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298 285 <span class="i">$YYTabFilePath</span> = <span class="k">defined</span> <span class="i">$This</span>-&gt;{<span class="w">YYTabFilePath</span>} ? <span class="i">$This</span>-&gt;{<span class="w">YYTabFilePath</span>} <span class="co">:</span> <span class="q">&#39;None&#39;</span><span class="sc">;</span>
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299 286
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300 287 <span class="i">$YYLexerInfoString</span> = <span class="q">&quot;YYTabFile: $YYTabFile; YYTabFilePath: $YYTabFilePath&quot;</span><span class="sc">;</span>
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301 288
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302 289 <span class="i">$YYTabDataMapString</span> = <span class="q">&quot;YYTabDataMap: None&quot;</span><span class="sc">;</span>
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303 290 <span class="k">if</span> <span class="s">(</span><span class="k">keys</span> <span class="i">%</span>{<span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}}<span class="s">)</span> <span class="s">{</span>
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304 291 <span class="k">my</span><span class="s">(</span><span class="i">$TokenLabel</span><span class="cm">,</span> <span class="i">$TokenNumber</span><span class="s">)</span><span class="sc">;</span>
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305 292
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306 293 <span class="i">$YYTabDataMapString</span> = <span class="q">&quot;YYTabDataMap:&quot;</span><span class="sc">;</span>
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307 294 <span class="k">for</span> <span class="i">$TokenLabel</span> <span class="s">(</span><span class="k">sort</span> <span class="k">keys</span> <span class="i">%</span>{<span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}}<span class="s">)</span> <span class="s">{</span>
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308 295 <span class="i">$TokenValue</span> = <span class="i">$This</span>-&gt;{<span class="w">YYTabDataMap</span>}{<span class="i">$TokenLabel</span>}<span class="sc">;</span>
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309 296 <span class="i">$YYTabDataMapString</span> .= <span class="q">&quot; ${TokenLabel}=${TokenValue}&quot;</span><span class="sc">;</span>
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310 297 <span class="s">}</span>
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311 298 <span class="s">}</span>
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312 299
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313 300 <span class="i">$YYLexerInfoString</span> .= <span class="q">&quot;; $YYTabDataMapString; &quot;</span> . <span class="i">$This</span><span class="i">-&gt;_GetLexerInfoString</span><span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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314 301
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315 302 <span class="k">return</span> <span class="i">$YYLexerInfoString</span><span class="sc">;</span>
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316 303 <span class="s">}</span>
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317 304
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318 <a name="EOF-"></a></pre>
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319 <p>&nbsp;</p>
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320 <br />
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321 <center>
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322 <img src="../../../images/h2o2.png">
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323 </center>
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324 </body>
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325 </html>