|
|
| version 1.7, 2001/02/22 13:33:25 | version 1.23.4.1, 2001/03/08 17:59:28 |
|---|---|
| Line 2 | Line 2 |
| $Id$ | $Id$ |
| */ | */ |
| /* | |
| data core | |
| */ | |
| #ifndef PA_WCONTEXT_H | #ifndef PA_WCONTEXT_H |
| #define PA_WCONTEXT_H | #define PA_WCONTEXT_H |
| #include "pa_value.h" | #include "pa_value.h" |
| #include "pa_vstring.h" | #include "pa_vstring.h" |
| #include "pa_vhash.h" | |
| class WContext : public Value { | class WContext : public Value { |
| public: // Value | public: // Value |
| // all: for error reporting after fail(), etc | // all: for error reporting after fail(), etc |
| const char *type() const { return "WContext"; } | const char *type() const { return "wcontext"; } |
| // wcontext: accumulated string | // WContext: accumulated fstring |
| String *get_string() { return string; }; | String *get_string() { return &fstring; }; |
| // wcontext: transparent | |
| Value *get_element(const String& name) const { return check_value()->get_element(name); } | // WContext: none yet | transparent |
| // wcontext: transparent | VClass *get_class() { return fvalue?fvalue->get_class():0; } |
| void put_element(const String& name, Value *avalue){ check_value()->put_element(name, avalue); } | |
| // wcontext: transparent | // wcontext: transparent |
| Method *get_method(const String& name) const { return check_value()->get_method(name); } | VAliased *get_aliased() { return fvalue?fvalue->get_aliased():0; } |
| // wcontext: none yet | transparent | |
| VClass *get_class() const { return fvalue?fvalue->get_class():0; } | public: // WContext |
| // wcontext: none yet | transparent | |
| bool is_or_derived_from(VClass& ancestor) { return fvalue?fvalue->is_or_derived_from(ancestor):false; } | // appends a fstring to result |
| virtual void write(String& astring); | |
| // if value is VString writes fstring, | |
| // else writes Value; raises an error if already | |
| virtual void write(Value& avalue); | |
| public: // usage | public: // usage |
| WContext(Pool& apool, Value *avalue) : Value(apool), | WContext(Pool& apool, Value *avalue, bool aconstructing) : Value(apool), |
| fvalue(avalue), | fvalue(avalue), |
| string(new(apool) String(apool)) { | fconstructing(aconstructing), |
| fstring(*new(apool) String(apool)) { | |
| } | } |
| // appends a string to result | bool constructing() { return fconstructing; } |
| void write(String *astring) { | |
| if(!astring) | |
| return; | |
| *string+=*astring; | |
| } | |
| // if value is VString writes string, | |
| // else writes Value; raises an error if already | |
| void write(Value *avalue) { | |
| if(!avalue) | |
| return; | |
| String *string=avalue->get_string(); | |
| if(string) | |
| write(string); | |
| else | |
| if(fvalue) // already have value? | |
| THROW(0,0, // don't need to construct twice | |
| 0, | |
| "value already assigned, use constructor to reassign it"); | |
| else | |
| fvalue=avalue; | |
| } | |
| // retrives the resulting value | // retrives the resulting value |
| // that can be VString if value==0 or the Value object | // that can be VString if value==0 or the Value object |
| Value *value() const { | Value *result() const { |
| return fvalue?fvalue:NEW VString(string); | return fvalue?fvalue:NEW VString(fstring); |
| } | } |
| private: | |
| String *string; | |
| Value *fvalue; | |
| protected: | |
| Value *fvalue; | |
| private: | private: |
| // raises an exception on 0 value | bool fconstructing; |
| Value *check_value() const { | String& fstring; |
| if(!fvalue) | |
| THROW(0,0, | |
| 0, | |
| "accessing wcontext without value"); | |
| return fvalue; | |
| } | |
| }; | }; |
| #endif | #endif |