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Annotation of parser3/src/types/pa_vvoid.h, revision 1.33

1.1       parser      1: /** @file
                      2:        Parser: @b void parser class.
                      3: 
1.29      misha       4:        Copyright (c) 2001-2009 ArtLebedev Group (http://www.artlebedev.com)
1.8       paf         5:        Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1       parser      6: */
                      7: 
                      8: #ifndef PA_VVOID_H
                      9: #define PA_VVOID_H
1.10      paf        10: 
1.33    ! moko       11: static const char * const IDENT_VVOID_H="$Date: 2010-09-16 23:33:52 $";
1.1       parser     12: 
1.3       parser     13: #include "classes.h"
1.1       parser     14: #include "pa_vstateless_object.h"
                     15: #include "pa_globals.h"
                     16: 
1.18      paf        17: extern Methoded* void_class;
1.1       parser     18: 
                     19: /// value of type 'void'. ex: usually $sjfklsjfksjdfk has this type
1.18      paf        20: class VVoid: public VStateless_object {
1.1       parser     21: public: // Value
                     22: 
1.18      paf        23:        override const char* type() const { return "void"; }
                     24:        override VStateless_class *get_class() { return void_class; }
1.1       parser     25: 
1.27      paf        26:        /// VVoid: true [the only one, that reports true]
                     27:        override bool is_void() const { return true; }
1.33    ! moko       28:        /// VVoid: with OPTIMIZE_SINGLE_STRING_WRITE it allows void to survive in [$void]
        !            29:        override bool is_string() const { return true; }
1.1       parser     30:        /// VVoid: ""
1.27      paf        31:        override const String* get_string() { return &void_string_value; }
1.1       parser     32:        /// VVoid: false
1.18      paf        33:        override bool as_bool() const { return false; }
1.2       parser     34:        /// VVoid: false
1.18      paf        35:        override bool is_defined() const { return false; }
1.1       parser     36:        /// VVoid: 0
1.18      paf        37:        override double as_double() const { return 0; }
1.1       parser     38:        /// VVoid: 0
1.18      paf        39:        override int as_int() const { return 0; }
1.1       parser     40:        /// VVoid: this
1.19      paf        41:        override Value& as_expr_result(bool /*return_string_as_is=false*/) { return *this; }
1.32      misha      42:        /// VVoid: json-string ("null")
                     43:        override const String* get_json_string(Json_options*) {
                     44:                static const String singleton_json_null(String("null"));
                     45:                return &singleton_json_null;
                     46:        }
1.22      paf        47: 
                     48:        /// VVoid: empty vfile
1.30      misha      49:        override VFile* as_vfile(String::Language lang, const Request_charsets *charsets);
1.1       parser     50: 
                     51:        /// VVoid: methods
1.31      misha      52:        override Value* get_element(const String& aname) {
1.1       parser     53:                // methods
1.31      misha      54:                if(Value* result=VStateless_object::get_element(aname))
1.1       parser     55:                        return result;
                     56: 
1.18      paf        57:                return 0;
1.16      paf        58:        }
                     59: 
                     60:        /// VVoid: bark
1.31      misha      61:        override const VJunction* put_element(const String& aname, Value* avalue, bool areplace) { 
                     62:                return Value::put_element(aname, avalue, areplace);
1.1       parser     63:        }
1.27      paf        64: 
1.29      misha      65:        inline static VVoid *get(){
                     66:                static VVoid singleton;
                     67:                return &singleton;
                     68:        }
                     69: 
1.27      paf        70: private:
                     71: 
                     72:        static const String void_string_value;
1.1       parser     73: 
                     74: };
                     75: 
                     76: #endif