Annotation of parser3/src/include/pa_wwrapper.h, revision 1.3
1.1 paf 1: /*
1.3 ! paf 2: $Id: pa_wwrapper.h,v 1.2 2001/02/23 18:12:44 paf Exp $
1.1 paf 3: */
4:
5: #ifndef PA_WWRAPPER_H
6: #define PA_WWRAPPER_H
7:
8: #include "pa_wcontext.h"
1.3 ! paf 9: #include "pa_exception.h"
1.1 paf 10:
11: class WWrapper : public WContext {
12: public: // Value
13:
14: // all: for error reporting after fail(), etc
15: const char *type() const { return "WWrapper"; }
16: // wcontext: transparent
17: Value *get_element(const String& name) { return check_value()->get_element(name); }
18: // wcontext: transparent
19: void put_element(const String& name, Value *avalue){
20: if(!fvalue)
21: fvalue=NEW VHash(pool());
22: fvalue->put_element(name, avalue);
23: }
24:
25: // wcontext: none yet | transparent
26: VClass *get_class() const { return fvalue?fvalue->get_class():0; }
27: // wcontext: none yet | transparent
28: bool is_or_derived_from(VClass& ancestor) { return fvalue?fvalue->is_or_derived_from(ancestor):false; }
29:
30: public: // usage
31:
32: WWrapper(Pool& apool, Value *avalue) : WContext(apool, avalue) {
33: }
34:
35: private:
36: // raises an exception on 0 value
37: Value *check_value() const {
38: if(!fvalue)
39: THROW(0,0,
40: 0,
1.3 ! paf 41: "accessing wrapper without value");
1.1 paf 42:
43: return fvalue;
44: }
45: };
46:
47: #endif
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