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# Grammars.h

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    00001 // $Id: Grammars.h,v 1.9 2007/09/26 16:13:41 marcocle Exp $
    00002 // ============================================================================
    00003 #ifndef GAUDIKERNEL_GRAMMARS_H
    00004 #define GAUDIKERNEL_GRAMMARS_H 1
    00005 // ============================================================================
    00006 // Include files
    00007 // ============================================================================
    00008 // STD & STL
    00009 // ============================================================================
    00010 #include <cctype>
    00011 // ============================================================================
    00012 // Boost.Spirit
    00013 // ============================================================================
    00014 #include "boost/spirit.hpp"
    00015 #include "boost/spirit/phoenix.hpp"
    00016 // ============================================================================
    00027 // ============================================================================
    00028 namespace Gaudi
    00029 {
    00030   namespace Parsers
    00031   {
    00032     // ========================================================================
    00033     using namespace boost::spirit ;
    00034     // ========================================================================
    00035     using namespace phoenix ;
    00036     // ========================================================================
    00045    template <typename T>
    00046     struct ClosureGrammar : public boost::spirit::closure < ClosureGrammar<T>,T >
    00047     {
    00048       typedef  boost::spirit::closure<ClosureGrammar, T> closure;
    00049       typename closure::member1 val;
    00050     };
    00051     // ========================================================================
    00062     template <typename T1,typename T2>
    00063     struct AttributesClosureGrammar
    00064       : public boost::spirit::closure<AttributesClosureGrammar<T1,T2>,T1,T2>
    00065     {
    00066       typedef boost::spirit::closure<AttributesClosureGrammar, T1,T2> closure;
    00067       typename closure::member1 val;
    00068       typename closure::member2 attrs;
    00069     };
    00070     // ========================================================================
    00082     class BoolGrammar : public grammar
    00083     <
    00084       BoolGrammar,
    00085       ClosureGrammar<bool>::context_t
    00086     >
    00087     {
    00088     public:
    00089       typedef bool ResultT;
    00090     public:
    00091       template <typename ScannerT>
    00092       struct definition
    00093       {
    00094         definition( BoolGrammar const &self)
    00095         {
    00096           boolean_literal
    00097             = true_literal[self.val = true] | false_literal[self.val = false];
    00098           true_literal
    00099             = str_p("true" ) | str_p("True" ) | str_p("TRUE" ) | str_p("1");
    00100           false_literal
    00101             = str_p("false") | str_p("False") | str_p("FALSE") | str_p("0");
    00102         }
    00103         rule<ScannerT> const& start() const
    00104         { return boolean_literal;}
    00105         rule<ScannerT> boolean_literal,true_literal,false_literal;
    00106       };
    00107     };
    00108     // ========================================================================
    00119     template<typename RT=char>
    00120     class CharGrammar : public grammar
    00121     <
    00122       CharGrammar<RT> , typename ClosureGrammar<RT>::context_t
    00123     >
    00124     {
    00125     public:
    00126       typedef RT ResultT;
    00127     public:
    00128       template <typename ScannerT>
    00129       struct definition
    00130       {
    00131         definition( CharGrammar<RT> const &self)
    00132         {
    00133           char_literal
    00134             = int_parser<RT>()[self.val=arg1]
    00135             | ('\''
    00136                >> ( str_p("\\'")[self.val='\'']
    00137                     | anychar_p[self.val=arg1]-'\'' )>>'\'');
    00138         }
    00139         rule<ScannerT> const& start() const
    00140         { return char_literal; }
    00141         rule<ScannerT> char_literal;
    00142       };
    00143     };
    00144     // ========================================================================
    00156     template<typename RT=int>
    00157     class IntGrammar : public grammar
    00158     <
    00159       IntGrammar<RT>,
    00160       typename ClosureGrammar<RT>::context_t
    00161     >
    00162     {
    00163     public:
    00164       typedef RT ResultT;
    00165     public:
    00166       template <typename ScannerT>
    00167       struct definition
    00168       {
    00169         definition( IntGrammar<RT> const &self)
    00170         {
    00171           int_literal = lexeme_d[int_parser<RT>()[self.val=arg1]
    00172             >> !(ch_p('u') | ch_p('U') | ch_p('l') | ch_p('L'))];
    00173         }
    00174         rule<ScannerT> const& start() const { return int_literal; }
    00175         rule<ScannerT> int_literal;
    00176       };
    00177     };
    00178     // ========================================================================
    00190     template<typename RT=double>
    00191     class RealGrammar : public grammar
    00192     <
    00193       RealGrammar<RT>,typename ClosureGrammar<RT>::context_t
    00194     >
    00195     {
    00196     public:
    00197       typedef RT ResultT;
    00198     public:
    00199       template <typename ScannerT>
    00200       struct definition
    00201       {
    00202         definition( RealGrammar const &self)
    00203         {
    00204           real_literal
    00205             = lexeme_d[real_parser<RT,
    00206             real_parser_policies<RT> >()[self.val = arg1]
    00207             >> !(ch_p('f') | ch_p('F') | ch_p('l') | ch_p('L'))];
    00208         }
    00209         rule<ScannerT> const& start() const
    00210         { return real_literal; }
    00211         rule<ScannerT> real_literal;
    00212       };
    00213     };
    00214     // ========================================================================
    00229     class StringGrammar : public grammar
    00230     <
    00231       StringGrammar, ClosureGrammar<std::string>::context_t
    00232     >
    00233     {
    00234     public:
    00235       typedef std::string ResultT;
    00244       void matchString() const
    00245       {
    00246         for ( std::string::iterator cur=this->val().begin();
    00247               cur!=this->val().end();cur++)
    00248         { if(std::isspace(*cur) ) { *cur = ' '; } }
    00249       }
    00250     public:
    00251         template <typename ScannerT>
    00252         struct definition
    00253         {
    00254           definition( StringGrammar const &self )
    00255           {
    00256             string_literal = (lexeme_d
    00257               [
    00258                ('"' >> (*( str_p("\\\"")
    00259                            |
    00260                            anychar_p-'"' ))
    00261                 [self.val = construct_<std::string>
    00262                  (arg1,arg2)] >>
    00263                 '"')
    00264                |
    00265                ('\'' >> (*( str_p("\\'")
    00266                             |
    00267                             anychar_p-'\'' ))
    00268                 [self.val = construct_<std::string>
    00269                  (arg1,arg2)]>>
    00270                 '\'')])[boost::bind(&StringGrammar::matchString,&self)];
    00271           }
    00272           rule<ScannerT> const& start() const { return string_literal; }
    00273           rule<ScannerT> string_literal;
    00274         };
    00275       };
    00276     // ========================================================================
    00289     class SkipperGrammar : public grammar<SkipperGrammar>
    00290     {
    00291     public:
    00295       SkipperGrammar ( const bool skipnewline = true )
    00296         : m_skipnewline(skipnewline){}
    00297     public:
    00299       bool skipnewline() const{return m_skipnewline;}
    00300     public:
    00301       template <typename ScannerT>
    00302       struct definition
    00303       {
    00304         definition( SkipperGrammar const& self)
    00305         {
    00306           if ( self.skipnewline() )
    00307           {
    00308             skip
    00309               =   space_p
    00310               |   comment_p("//")     // C++ comment
    00311               |   comment_p("/*", "*/")     // C comment
    00312               ;
    00313           }
    00314           else
    00315           {
    00316             skip
    00317               =   (space_p-eol_p)
    00318               |   comment_p("//")     // C++ comment
    00319               |   comment_p("/*", "*/")     // C comment
    00320               ;
    00321           }
    00322         }
    00323         rule<ScannerT>  skip;
    00324         rule<ScannerT> const& start() const { return skip; }
    00325       };
    00326     private:
    00327       bool m_skipnewline;
    00328     };
    00329     // ========================================================================
    00340     template <typename KeyGrammarT, typename ValueGrammarT>
    00341     class PairGrammar : public grammar
    00342     <
    00343       PairGrammar<KeyGrammarT,ValueGrammarT>,
    00344       typename ClosureGrammar<
    00345       std::pair<typename KeyGrammarT::ResultT,
    00346                 typename ValueGrammarT::ResultT> >::context_t
    00347     >
    00348     {
    00349     public:
    00350       typedef typename KeyGrammarT::ResultT KeyT;
    00351       typedef typename ValueGrammarT::ResultT ValueT;
    00352       typedef std::pair<KeyT,ValueT> ResultT;
    00353     public:
    00357       PairGrammar ( const std::string&  delim = "," )
    00358         : m_delim(delim) {}
    00359     public:
    00361       void matchFirst  ( const KeyT&   first  ) const { this->val().first = first; }
    00363       void matchSecond ( const ValueT& second ) const { this->val().second = second; }
    00364     public:
    00365       template <typename ScannerT>
    00366       struct definition
    00367       {
    00368         definition( PairGrammar const &self)
    00369         {
    00370           para
    00371             = (
    00372                str_p("(")
    00373                >> (grkey[boost::bind(&PairGrammar::matchFirst,&self,_1)])
    00374                >> self.delim().c_str()
    00375                >> (grvalue[boost::bind(&PairGrammar::matchSecond,&self,_1)])
    00376                >> str_p(")")
    00377                ) ;
    00378         }
    00379         rule<ScannerT> const& start() const { return para; }
    00380         rule<ScannerT> para;
    00381         KeyGrammarT grkey;
    00382         ValueGrammarT grvalue;
    00383       };
    00384     public:
    00386       const std::string& delim() const { return m_delim ; }
    00390       void setDelim ( const std::string& delim ) { m_delim = delim;}
    00391     private:
    00392       std::string m_delim;
    00393     };
    00394     // ========================================================================
    00406     template <typename GrammarT>
    00407     class VectorGrammar : public grammar
    00408     <
    00409       VectorGrammar<GrammarT> ,
    00410       typename ClosureGrammar<std::vector<typename GrammarT::ResultT> >::context_t
    00411     >
    00412     {
    00413     public:
    00414       typedef typename GrammarT::ResultT ValueT;
    00415       typedef std::vector<ValueT> ResultT;
    00416       typedef VectorGrammar<GrammarT> SelfT;
    00417     public:
    00419       void matchItem(const ValueT& value) const { this->val().push_back(value); }
    00420     public:
    00421       template <typename ScannerT>
    00422       struct definition
    00423       {
    00424         definition(SelfT const &self)
    00425         {
    00426           inner =
    00427             !(gr[boost::bind(&VectorGrammar::matchItem,&self,_1)]
    00428               >> *(','>>gr[boost::bind(&VectorGrammar::matchItem,&self,_1)]));
    00429           vec =
    00430             "{">>inner>>"}" | "[">>inner>>"]";
    00431         }
    00432         rule<ScannerT> const& start() const { return vec; }
    00433         rule<ScannerT> vec,inner;
    00434         GrammarT gr;
    00435       };
    00436     };
    00437     // ========================================================================
    00452     template <typename KeyGrammarT, typename ValueGrammarT>
    00453     class MapGrammar : public grammar
    00454     <
    00455       MapGrammar<KeyGrammarT,ValueGrammarT>,
    00456       typename AttributesClosureGrammar
    00457       < std::map<typename KeyGrammarT::ResultT,
    00458                  typename ValueGrammarT::ResultT>,
    00459         std::pair<typename KeyGrammarT::ResultT,
    00460                   typename ValueGrammarT::ResultT> >::context_t
    00461     >
    00462     {
    00463     public:
    00464       typedef typename KeyGrammarT::ResultT KeyT;
    00465       typedef typename ValueGrammarT::ResultT ValueT;
    00466       typedef std::map<KeyT,ValueT> ResultT;
    00467     public:
    00469       void matchItem  () const
    00470       {
    00471         //this->val().insert(this->attrs());
    00472         this->val()[this->attrs().first] = this->attrs().second ;
    00473       }
    00475       void matchFirst ( const KeyT&   value ) const {  this->attrs().first = value ; }
    00477       void matchSecond( const ValueT& value ) const { this->attrs().second = value ; }
    00478     public:
    00479       template <typename ScannerT>
    00480       struct definition
    00481       {
    00482         definition( MapGrammar const &self)
    00483         {
    00484           vec
    00485             = ('{'>> inner_list >> '}') | ('['>>inner_list>>']');
    00486           inner_list
    00487             =
    00488             !( inner[boost::bind(&MapGrammar::matchItem,&self)]
    00489                >> *( ch_p(',') >>
    00490                      inner[boost::bind(&MapGrammar::matchItem,&self)] )
    00491                );
    00492           inner
    00493             =
    00494             grKey[boost ::bind(&MapGrammar::matchFirst,&self,_1)]
    00495               >> ( ch_p('=') | ch_p(':'))
    00496               >> grValue[boost::bind(&MapGrammar::matchSecond,&self,_1)] ;
    00497         }
    00498         KeyGrammarT grKey;
    00499         ValueGrammarT grValue;
    00500         rule<ScannerT> const& start() const { return vec; }
    00501         rule<ScannerT> vec,inner, inner_list ;
    00502       };
    00503     };
    00504     // ========================================================================
    00505   } // end of namespace Gaudi::Parsers
    00506 } // end of namespace Gaudi
    00507 // ============================================================================
    00508 // The END
    00509 // ============================================================================
    00510 #endif // GAUDIKERNEL_GRAMMARS_H
    00511 // ============================================================================