libwreport  2.4
var.h
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00001 /*
00002  * wreport/var - Store a value and its informations
00003  *
00004  * Copyright (C) 2005--2011  ARPA-SIM <urpsim@smr.arpa.emr.it>
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
00018  *
00019  * Author: Enrico Zini <enrico@enricozini.com>
00020  */
00021 
00022 #ifndef WREPORT_VAR_H
00023 #define WREPORT_VAR_H
00024 
00031 #include <wreport/error.h>
00032 #include <wreport/varinfo.h>
00033 #include <cstdio>
00034 #include <string>
00035 #include <memory>
00036 
00037 struct lua_State;
00038 
00039 namespace wreport {
00040 
00050 class Var
00051 {
00052 protected:
00054     Varinfo m_info;
00055 
00057     char* m_value;
00058 
00060     Var* m_attrs;
00061 
00062 public:
00064     Var(Varinfo info);
00065 
00067     Var(Varinfo info, int val);
00068 
00070     Var(Varinfo info, double val);
00071 
00073     Var(Varinfo info, const char* val);
00074 
00076     Var(const Var& var);
00077 
00079     Var(const Var& var, bool with_attrs);
00080 
00091     Var(Varinfo info, const Var& var);
00092 
00093     ~Var();
00094     
00096     Var& operator=(const Var& var);
00097 
00099     bool operator==(const Var& var) const;
00100 
00102     bool operator!=(const Var& var) const { return !operator==(var); }
00103 
00105     Varcode code() const throw ();
00106 
00108     Varinfo info() const throw ();
00109 
00111     const char* value() const throw ();
00112 
00114     bool isset() const throw ();
00115 
00117     int enqi() const;
00118 
00120     double enqd() const;
00121 
00123     const char* enqc() const;
00124 
00126     template<typename T>
00127     T enq() const
00128     {
00129         throw error_unimplemented("getting value of unsupported type");
00130     }
00131 
00136     template<typename T>
00137     T enq(T default_value) const
00138     {
00139         if (!isset()) return default_value;
00140         return enq<T>();
00141     }
00142 
00144     void seti(int val);
00145 
00147     void setd(double val);
00148 
00150     void setc(const char* val);
00151 
00158     void set_binary(const unsigned char* val);
00159 
00166     void setc_truncate(const char* val);
00167 
00169     void set_from_formatted(const char* val);
00170 
00176     void set(int val) { seti(val); }
00177     void set(double val) { setd(val); }
00178     void set(const char* val) { setc(val); }
00179     void set(const std::string& val) { setc(val.c_str()); }
00180     void set(const Var& var) { copy_val(var); }
00182 
00184     void unset();
00185 
00187     void clear_attrs();
00188 
00198     const Var* enqa(Varcode code) const;
00199 
00204     const Var* enqa_by_associated_field_significance(unsigned significance) const;
00205 
00214     void seta(const Var& attr);
00215 
00224     void seta(std::auto_ptr<Var> attr);
00225 
00227     void unseta(Varcode code);
00228 
00237     const Var* next_attr() const;
00238 
00245     void copy_val(const Var& src);
00246 
00253     void copy_val_only(const Var& src);
00254 
00261     void copy_attrs(const Var& src);
00262 
00270     void copy_attrs_if_defined(const Var& src);
00271 
00278     std::string format(const char* ifundef = "(undef)") const;
00279 
00286     void print(FILE* out) const;
00287 
00294     void print(std::ostream& out) const;
00295 
00302     void print_without_attrs(FILE* out) const;
00303 
00310     void print_without_attrs(std::ostream& out) const;
00311 
00323     unsigned diff(const Var& var) const;
00324 
00325 
00329     void lua_push(struct lua_State* L);
00330 
00336     static Var* lua_check(struct lua_State* L, int idx);
00337 };
00338 
00339 template<> inline int Var::enq() const { return enqi(); }
00340 template<> inline float Var::enq() const { return (float)enqd(); }
00341 template<> inline double Var::enq() const { return enqd(); }
00342 template<> inline const char* Var::enq() const { return enqc(); }
00343 template<> inline std::string Var::enq() const { return enqc(); }
00344 
00345 
00346 }
00347 
00348 #endif
00349 /* vim:set ts=4 sw=4: */