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124 .\" ========================================================================
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125 .\"
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126 .IX Title "SIMPLECALCPARSER 1"
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127 .TH SIMPLECALCPARSER 1 "2015-03-29" "perl v5.14.2" "MayaChemTools"
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128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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129 .\" way too many mistakes in technical documents.
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130 .if n .ad l
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131 .nh
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132 .SH "NAME"
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133 Parsers::SimpleCalcParser
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134 .SH "SYNOPSIS"
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135 .IX Header "SYNOPSIS"
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136 use Parsers::SimpleCalcParser ;
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137 .PP
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138 use Parsers::SimpleCalcParser qw(:all);
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139 .SH "DESCRIPTION"
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140 .IX Header "DESCRIPTION"
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141 \&\fBParsers::SimpleCalcParser\fR class provides the following methods:
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142 .PP
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143 new, yyclearin, yyerrok, yyerror, yyparse
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144 .PP
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145 \&\fBParsers::SimpleCalcParse.yy\fR parser grammer definition file implements a simple
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146 calculator and is provided to highlight usage of lexer capability available through
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147 \&\fBParsers::SimpleCalcYYLexer\fR, which in turn uses \fBParsers::YYLexer\fR and
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148 \&\fBParsers::Lexer\fR classes to procide underlying lexer functionality.
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149 .PP
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150 The parser package and token table files, \fBParsers::SimpleCalcParser.pm\fR and
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151 \&\fBSimpleCalcParser.tab.ph\fR, are automatically generated from parser grammar definition
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152 file, \fBParsers::SimpleCalcParser.yy\fR, using byacc available through perl\-byacc1.8 modified
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153 with perl5\-byacc\-patches\-0.5 for generation of object oriented parser:
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154 .PP
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155 .Vb 2
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156 \& byacc \-l \-P \-d \-b SimpleCalcParser SimpleCalcParser.yy
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157 \& mv SimpleCalcParser.tab.pl SimpleCalcParser.pm
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158 .Ve
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159 .SS "\s-1METHODS\s0"
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160 .IX Subsection "METHODS"
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161 .IP "\fBnew\fR" 4
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162 .IX Item "new"
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163 .Vb 4
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164 \& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex,
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165 \& \e&Parsers::SimpleCalcParser::yyerror);
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166 \& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex,
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167 \& \e&Parsers::SimpleCalcParser::yyerror, $Debug);
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168 .Ve
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169 .Sp
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170 Using specified \fIYYLex\fR \fIYYError\fR functions, \fBnew\fR method generates a new
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171 \&\fBSimpleCalcParser\fR and returns a reference to newly created \fBSimpleCalcYYParser\fR object.
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172 .Sp
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173 Examples:
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174 .Sp
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175 .Vb 4
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176 \& # Input string...
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177 \& $InputText = "3 + 4 +6\enx=3\eny=5\enx+y\enx+z\en";
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178 \& $YYLexer = new Parsers::SimpleCalcYYLexer($InputText);
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179 \& $YYLex = $YYLexer\->GetYYLex();
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180 \&
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181 \& $Debug = 0;
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182 \& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex,
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183 \& \e&Parsers::SimpleCalcParser::yyerror, $Debug);
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184 \& $Value = $SimpleCalcParser\->yyparse();
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185 \& print "Value = " . (defined($Value) ? "$Value" : "Undefined") . "\en";
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186 \&
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187 \& # Input file...
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188 \& $InputFile = "TestSimpleCalcParser.txt";
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189 \& open INPUTFILE, "$InputFile" or die "Couldn\*(Aqt open $InputFile: $!\en";
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190 \&
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191 \& $YYLexer = new Parsers::SimpleCalcYYLexer(\e*INPUTFILE);
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192 \& $YYLex = $YYLexer\->GetYYLex();
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193 \&
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194 \& $Debug = 0;
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195 \& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex,
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196 \& \e&Parsers::SimpleCalcParser::yyerror, $Debug);
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197 \& $Value = $SimpleCalcParser\->yyparse();
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198 \& print "Value = " . (defined($Value) ? "$Value" : "Undefined") . "\en";
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199 \&
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200 \& close INPUTFILE;
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201 \&
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202 \& # Input iterator...
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203 \& $InputFile = "TestSimpleCalcParser.txt";
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204 \& open INPUTFILE, "$InputFile" or die "Couldn\*(Aqt open $InputFile: $!\en";
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205 \& $InputIterator = sub { return <INPUTFILE>; };
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206 \&
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207 \& $YYLexer = new Parsers::SimpleCalcYYLexer($InputIterator);
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208 \& $YYLex = $YYLexer\->GetYYLex();
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209 \&
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210 \& $Debug = 0;
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211 \& $SimpleCalcParser = new Parsers::SimpleCalcParser($YYLex,
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212 \& \e&Parsers::SimpleCalcParser::yyerror, $Debug);
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213 \& $Value = $SimpleCalcParser\->yyparse();
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214 \& print "Value = " . (defined($Value) ? "$Value" : "Undefined") . "\en";
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215 \&
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216 \& close INPUTFILE;
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217 .Ve
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218 .IP "\fByyclearin\fR" 4
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219 .IX Item "yyclearin"
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220 .Vb 1
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221 \& $SimpleCalcParser\->yyclearin();
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222 .Ve
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223 .Sp
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224 \&\fByyclearin\fR method clears any previous look-ahead token after encountering a syntax error
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225 during parsing. It can be used after \fByyerrok\fR in a grammer rule with the reserved word
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226 \&\fBerror\fR.
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227 .IP "\fByyerrok\fR" 4
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228 .IX Item "yyerrok"
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229 .Vb 1
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230 \& $SimpleCalcParser\->yyerrok();
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231 .Ve
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232 .Sp
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233 \&\fByyerrok\fR method is used with the reserved word \fBerror\fR in grammer rule to indcate
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234 error recovery is complete after encountering a syntax error during parsing.
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235 .IP "\fByyerror\fR" 4
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236 .IX Item "yyerror"
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237 .Vb 1
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238 \& $SimpleCalcParser\->yyerror();
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239 .Ve
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240 .Sp
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241 \&\fByyerror\fR function is provided for the caller to use during initialization of a parser. It
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242 is used by \fByyparse\fR to print any error messages encountered during parsing of the
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243 input.
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244 .IP "\fByyparse\fR" 4
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245 .IX Item "yyparse"
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246 .Vb 1
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247 \& $Value = $SimpleCalcParser\->yyparse();
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248 .Ve
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249 .Sp
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250 Returns \fIValue\fR after parsing all the input from a input stream using specified
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251 grammer rules.
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252 .SH "AUTHOR"
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253 .IX Header "AUTHOR"
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254 Manish Sud <msud@san.rr.com>
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255 .SH "SEE ALSO"
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256 .IX Header "SEE ALSO"
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257 Lexer.pm, YYLexer.pm, SimpleCalcYYLexer.pm
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258 .SH "COPYRIGHT"
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259 .IX Header "COPYRIGHT"
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260 Copyright (C) 2015 Manish Sud. All rights reserved.
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261 .PP
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262 This file is part of MayaChemTools.
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263 .PP
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264 MayaChemTools is free software; you can redistribute it and/or modify it under
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265 the terms of the \s-1GNU\s0 Lesser General Public License as published by the Free
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266 Software Foundation; either version 3 of the License, or (at your option)
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267 any later version.
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