<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Flex Bison C++ Example: src/parser.yy Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css">
<link href="doxygen.css" rel="stylesheet" type="text/css">
</head><body>
<!-- Generated by Doxygen 1.5.9 -->
<div class="navigation" id="top">
<div class="tabs">
<ul>
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="namespaces.html"><span>Namespaces</span></a></li>
<li><a href="annotated.html"><span>Classes</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
</ul>
</div>
<div class="tabs">
<ul>
<li><a href="files.html"><span>File List</span></a></li>
<li><a href="globals.html"><span>File Members</span></a></li>
</ul>
</div>
<h1>src/parser.yy</h1><a href="parser_8yy.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* $Id: parser.yy 48 2009-09-05 08:07:10Z tb $ -*- mode: c++ -*- */</span>
<a name="l00004"></a>00004 %{ <span class="comment">/*** C/C++ Declarations ***/</span>
<a name="l00005"></a>00005
<a name="l00006"></a>00006 <span class="preprocessor">#include <stdio.h></span>
<a name="l00007"></a>00007 <span class="preprocessor">#include <string></span>
<a name="l00008"></a>00008 <span class="preprocessor">#include <vector></span>
<a name="l00009"></a>00009
<a name="l00010"></a>00010 <span class="preprocessor">#include "<a class="code" href="expression_8h.html" title="Implements an example calculator class group.">expression.h</a>"</span>
<a name="l00011"></a>00011
<a name="l00012"></a>00012 %}
<a name="l00013"></a>00013
<a name="l00014"></a>00014 <span class="comment">/*** yacc/bison Declarations ***/</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">/* Require bison 2.3 or later */</span>
<a name="l00017"></a>00017 %require <span class="stringliteral">"2.3"</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="comment">/* add debug output code to generated parser. disable this for release</span>
<a name="l00020"></a>00020 <span class="comment"> * versions. */</span>
<a name="l00021"></a>00021 %debug
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="comment">/* start symbol is named "start" */</span>
<a name="l00024"></a>00024 %start start
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="comment">/* write out a header file containing the token defines */</span>
<a name="l00027"></a>00027 %defines
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="comment">/* use newer C++ skeleton file */</span>
<a name="l00030"></a>00030 %skeleton <span class="stringliteral">"lalr1.cc"</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">/* namespace to enclose parser in */</span>
<a name="l00033"></a><a class="code" href="parser_8yy.html#00025fc5594612204625c5d8ab7703e7">00033</a> %name-<a class="code" href="parser_8yy.html#00025fc5594612204625c5d8ab7703e7">prefix</a>=<span class="stringliteral">"example"</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="comment">/* set the parser's class identifier */</span>
<a name="l00036"></a>00036 %define <span class="stringliteral">"parser_class_name"</span> <span class="stringliteral">"Parser"</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="comment">/* keep track of the current position within the input */</span>
<a name="l00039"></a>00039 %locations
<a name="l00040"></a>00040 %initial-action
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042 <span class="comment">// initialize the initial location object</span>
<a name="l00043"></a>00043 @$.begin.filename = @$.end.filename = &driver.streamname;
<a name="l00044"></a>00044 };
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="comment">/* The driver is passed by reference to the parser and to the scanner. This</span>
<a name="l00047"></a>00047 <span class="comment"> * provides a simple but effective pure interface, not relying on global</span>
<a name="l00048"></a>00048 <span class="comment"> * variables. */</span>
<a name="l00049"></a>00049 %parse-param { <span class="keyword">class </span>Driver& driver }
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">/* verbose error messages */</span>
<a name="l00052"></a>00052 %error-verbose
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="comment">/*** BEGIN EXAMPLE - Change the example grammar's tokens below ***/</span>
<a name="l00055"></a>00055
<a name="l00056"></a>00056 %<span class="keyword">union </span>{
<a name="l00057"></a>00057 <span class="keywordtype">int</span> integerVal;
<a name="l00058"></a>00058 <span class="keywordtype">double</span> doubleVal;
<a name="l00059"></a>00059 std::string* stringVal;
<a name="l00060"></a>00060 <span class="keyword">class </span><a class="code" href="classCalcNode.html" title="CalcNode is the abstract base class for calculation nodes.">CalcNode</a>* calcnode;
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062
<a name="l00063"></a>00063 %<a class="code" href="structexample_1_1Parser_1_1token.html" title="Tokens.">token</a> END 0 <span class="stringliteral">"end of file"</span>
<a name="l00064"></a>00064 %<a class="code" href="structexample_1_1Parser_1_1token.html" title="Tokens.">token</a> EOL <span class="stringliteral">"end of line"</span>
<a name="l00065"></a>00065 %<a class="code" href="structexample_1_1Parser_1_1token.html" title="Tokens.">token <integerVal></a> INTEGER <span class="stringliteral">"integer"</span>
<a name="l00066"></a>00066 %<a class="code" href="structexample_1_1Parser_1_1token.html" title="Tokens.">token <doubleVal></a> DOUBLE <span class="stringliteral">"double"</span>
<a name="l00067"></a>00067 %<a class="code" href="structexample_1_1Parser_1_1token.html" title="Tokens.">token <stringVal></a> STRING <span class="stringliteral">"string"</span>
<a name="l00068"></a>00068
<a name="l00069"></a>00069 %type <calcnode> constant variable
<a name="l00070"></a>00070 %type <calcnode> atomexpr powexpr unaryexpr mulexpr addexpr expr
<a name="l00071"></a>00071
<a name="l00072"></a>00072 %destructor { <span class="keyword">delete</span> $$; } STRING
<a name="l00073"></a>00073 %destructor { <span class="keyword">delete</span> $$; } constant variable
<a name="l00074"></a>00074 %destructor { <span class="keyword">delete</span> $$; } atomexpr powexpr unaryexpr mulexpr addexpr expr
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">/*** END EXAMPLE - Change the example grammar's tokens above ***/</span>
<a name="l00077"></a>00077
<a name="l00078"></a>00078 %{
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="preprocessor">#include "<a class="code" href="driver_8h.html" title="Declaration of the example::Driver class.">driver.h</a>"</span>
<a name="l00081"></a>00081 <span class="preprocessor">#include "<a class="code" href="scanner_8h.html">scanner.h</a>"</span>
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="comment">/* this "connects" the bison parser in the driver to the flex scanner class</span>
<a name="l00084"></a>00084 <span class="comment"> * object. it defines the yylex() function call to pull the next token from the</span>
<a name="l00085"></a>00085 <span class="comment"> * current lexer object of the driver context. */</span>
<a name="l00086"></a>00086 <span class="preprocessor">#undef yylex</span>
<a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#define yylex driver.lexer->lex</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span>
<a name="l00089"></a>00089 %}
<a name="l00090"></a>00090
<a name="l00091"></a>00091 %% <span class="comment">/*** Grammar Rules ***/</span>
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="comment">/*** BEGIN EXAMPLE - Change the example grammar rules below ***/</span>
<a name="l00094"></a>00094
<a name="l00095"></a>00095 constant : INTEGER
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 $$ = <span class="keyword">new</span> <a class="code" href="classCNConstant.html" title="Calculation node always returning a constant value.">CNConstant</a>($1);
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 | DOUBLE
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101 $$ = <span class="keyword">new</span> <a class="code" href="classCNConstant.html" title="Calculation node always returning a constant value.">CNConstant</a>($1);
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103
<a name="l00104"></a>00104 variable : STRING
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 <span class="keywordflow">if</span> (!driver.calc.existsVariable(*$1)) {
<a name="l00107"></a>00107 error(yyloc, std::string(<span class="stringliteral">"Unknown variable \""</span>) + *$1 + <span class="stringliteral">"\""</span>);
<a name="l00108"></a>00108 <span class="keyword">delete</span> $1;
<a name="l00109"></a>00109 <a class="code" href="parser_8cc.html#f1eef6197be78122699013d0784acc80">YYERROR</a>;
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 <span class="keywordflow">else</span> {
<a name="l00112"></a>00112 $$ = <span class="keyword">new</span> <a class="code" href="classCNConstant.html" title="Calculation node always returning a constant value.">CNConstant</a>( driver.calc.getVariable(*$1) );
<a name="l00113"></a>00113 <span class="keyword">delete</span> $1;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116
<a name="l00117"></a>00117 atomexpr : constant
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 $$ = $1;
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121 | variable
<a name="l00122"></a>00122 {
<a name="l00123"></a>00123 $$ = $1;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 | <span class="charliteral">'('</span> expr <span class="charliteral">')'</span>
<a name="l00126"></a>00126 {
<a name="l00127"></a>00127 $$ = $2;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00130"></a>00130 powexpr : atomexpr
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 $$ = $1;
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 | atomexpr <span class="charliteral">'^'</span> powexpr
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136 $$ = <span class="keyword">new</span> <a class="code" href="classCNPower.html" title="Calculation node raising one operand to the power of the second.">CNPower</a>($1, $3);
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138
<a name="l00139"></a>00139 unaryexpr : powexpr
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 $$ = $1;
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 | <span class="charliteral">'+'</span> powexpr
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 $$ = $2;
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 | <span class="charliteral">'-'</span> powexpr
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149 $$ = <span class="keyword">new</span> <a class="code" href="classCNNegate.html" title="Calculation node negating the value of the operand subtree.">CNNegate</a>($2);
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151
<a name="l00152"></a>00152 mulexpr : unaryexpr
<a name="l00153"></a>00153 {
<a name="l00154"></a>00154 $$ = $1;
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 | mulexpr <span class="charliteral">'*'</span> unaryexpr
<a name="l00157"></a>00157 {
<a name="l00158"></a>00158 $$ = <span class="keyword">new</span> <a class="code" href="classCNMultiply.html" title="Calculation node multiplying two operand nodes.">CNMultiply</a>($1, $3);
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 | mulexpr <span class="charliteral">'/'</span> unaryexpr
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162 $$ = <span class="keyword">new</span> <a class="code" href="classCNDivide.html" title="Calculation node dividing two operand nodes.">CNDivide</a>($1, $3);
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 | mulexpr <span class="charliteral">'%'</span> unaryexpr
<a name="l00165"></a>00165 {
<a name="l00166"></a>00166 $$ = <span class="keyword">new</span> <a class="code" href="classCNModulo.html" title="Calculation node calculating the remainder of an integer division of two operand...">CNModulo</a>($1, $3);
<a name="l00167"></a>00167 }
<a name="l00168"></a>00168
<a name="l00169"></a>00169 addexpr : mulexpr
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 $$ = $1;
<a name="l00172"></a>00172 }
<a name="l00173"></a>00173 | addexpr <span class="charliteral">'+'</span> mulexpr
<a name="l00174"></a>00174 {
<a name="l00175"></a>00175 $$ = <span class="keyword">new</span> <a class="code" href="classCNAdd.html" title="Calculation node adding two operand nodes.">CNAdd</a>($1, $3);
<a name="l00176"></a>00176 }
<a name="l00177"></a>00177 | addexpr <span class="charliteral">'-'</span> mulexpr
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 $$ = <span class="keyword">new</span> <a class="code" href="classCNSubtract.html" title="Calculation node subtracting two operand nodes.">CNSubtract</a>($1, $3);
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181
<a name="l00182"></a>00182 expr : addexpr
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184 $$ = $1;
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186
<a name="l00187"></a>00187 assignment : STRING <span class="charliteral">'='</span> expr
<a name="l00188"></a>00188 {
<a name="l00189"></a>00189 driver.calc.variables[*$1] = $3->evaluate();
<a name="l00190"></a>00190 std::cout << <span class="stringliteral">"Setting variable "</span> << *$1
<a name="l00191"></a>00191 << <span class="stringliteral">" = "</span> << driver.calc.variables[*$1] << <span class="stringliteral">"\n"</span>;
<a name="l00192"></a>00192 <span class="keyword">delete</span> $1;
<a name="l00193"></a>00193 <span class="keyword">delete</span> $3;
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195
<a name="l00196"></a>00196 start : <span class="comment">/* empty */</span>
<a name="l00197"></a>00197 | start <span class="charliteral">';'</span>
<a name="l00198"></a>00198 | start EOL
<a name="l00199"></a>00199 | start assignment <span class="charliteral">';'</span>
<a name="l00200"></a>00200 | start assignment EOL
<a name="l00201"></a>00201 | start assignment END
<a name="l00202"></a>00202 | start expr <span class="charliteral">';'</span>
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204 driver.calc.expressions.push_back($2);
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 | start expr EOL
<a name="l00207"></a>00207 {
<a name="l00208"></a>00208 driver.calc.expressions.push_back($2);
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210 | start expr END
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 driver.calc.expressions.push_back($2);
<a name="l00213"></a>00213 }
<a name="l00214"></a>00214
<a name="l00215"></a>00215 <span class="comment">/*** END EXAMPLE - Change the example grammar rules above ***/</span>
<a name="l00216"></a>00216
<a name="l00217"></a>00217 %% <span class="comment">/*** Additional Code ***/</span>
<a name="l00218"></a>00218
<a name="l00219"></a>00219 <span class="keywordtype">void</span> <a class="code" href="classexample_1_1Parser.html#47c22356158b28f0e3da36f2254af7bb" title="Report a syntax error.">example::Parser::error</a>(<span class="keyword">const</span> Parser::location_type& l,
<a name="l00220"></a>00220 <span class="keyword">const</span> std::string& m)
<a name="l00221"></a>00221 {
<a name="l00222"></a>00222 <a class="code" href="classexample_1_1Parser.html#e8fbd18ca0bed43352d5fe35957654f9">driver</a>.error(l, m);
<a name="l00223"></a>00223 }
</pre></div></div>
<hr size="1"><address style="text-align: right;"><small>Generated on Sat Sep 5 10:26:25 2009 for Flex Bison C++ Example by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.9 </small></address>
</body>
</html>
