Annotation of parser3/src/types/pa_wcontext.h, revision 1.46
1.12 paf 1: /** @file
2: Parser: write context class decl.
3:
1.46 ! paf 4: Copyright (c) 2001-2004 ArtLebedev Group (http://www.artlebedev.com)
1.27 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_WCONTEXT_H
9: #define PA_WCONTEXT_H
1.33 paf 10:
1.46 ! paf 11: static const char * const IDENT_WCONTEXT_H="$Date: 2003/11/20 16:34:30 $";
1.1 paf 12:
13: #include "pa_value.h"
14: #include "pa_vstring.h"
15: #include "pa_vhash.h"
16:
17: class Request;
18:
1.29 paf 19: class StringOrValue {
20: public:
21: StringOrValue() : fstring(0), fvalue(0) {}
22: /// anticipating either String or Value [must not be 0&0]
1.43 paf 23: StringOrValue(const String* astring, Value* avalue) : fstring(astring), fvalue(avalue) {}
1.30 paf 24: void set_string(const String& astring) { fstring=&astring; }
1.29 paf 25: void set_value(Value& avalue) { fvalue=&avalue; }
1.43 paf 26: const String* get_string() { return fstring; }
27: Value* get_value() { return fvalue; }
1.29 paf 28: Value& as_value() const {
1.43 paf 29: Value* result=fvalue?fvalue:new VString(*fstring);
30: return *result;
1.29 paf 31: }
32: const String& as_string() const {
33: return fstring?*fstring:fvalue->as_string();
34: }
35: private:
1.43 paf 36: const String* fstring;
37: Value* fvalue;
1.29 paf 38: };
39:
1.12 paf 40: /** Write context
41: they do different write()s here, later picking up the result
42: @see Request::wcontext
43: */
1.43 paf 44: class WContext: public Value {
1.18 paf 45: friend class Request;
1.19 paf 46:
1.1 paf 47: public: // Value
48:
1.43 paf 49: override const char* type() const { return "wcontext"; }
1.12 paf 50: /// WContext: accumulated fstring
1.43 paf 51: override const String* get_string() { return &fstring; };
1.1 paf 52:
1.12 paf 53: /// WContext: none yet | transparent
1.43 paf 54: override VStateless_class *get_class() { return fvalue?fvalue->get_class():0; }
1.1 paf 55:
56: public: // WContext
57:
1.12 paf 58: /// appends a fstring to result
1.43 paf 59: virtual void write(const String& astring, String::Language alang) {
60: fstring.append(astring, alang);
1.35 paf 61: }
1.32 paf 62: /// writes Value; raises an error if already, providing origin
1.43 paf 63: virtual void write(Value& avalue);
1.1 paf 64:
1.12 paf 65: /**
66: if value is VString writes fstring,
1.32 paf 67: else writes Value; raises an error if already, providing origin
68: */
1.43 paf 69: void write(
70: Value& avalue, String::Language alang) {
71: if(const String* fstring=avalue.get_string())
72: write(*fstring, alang);
1.32 paf 73: else
1.43 paf 74: write(avalue);
1.32 paf 75: }
1.1 paf 76:
1.12 paf 77: /**
78: retrives the resulting value
1.29 paf 79: that can be String if value==0 or the Value object
1.12 paf 80: wmethod_frame first checks for $result and if there is one, returns it instead
81: */
1.29 paf 82: virtual StringOrValue result() {
83: return fvalue?StringOrValue(0, fvalue):StringOrValue(&fstring, 0);
1.7 paf 84: }
85:
1.43 paf 86: void attach_junction(Junction* ajunction) {
87: junctions+=ajunction;
1.39 paf 88: }
89:
1.1 paf 90: public: // usage
91:
1.43 paf 92: WContext(Value* avalue, WContext *aparent):
93: fstring(*new String),
1.39 paf 94: fvalue(avalue),
1.43 paf 95: fparent(aparent) {
1.20 paf 96: flags.constructing=
97: flags.entered_class=
98: flags.entered_object=0;
1.1 paf 99: }
1.44 paf 100: virtual ~WContext() {
1.39 paf 101: detach_junctions();
102: }
1.1 paf 103:
1.20 paf 104: void set_constructing(bool aconstructing) { flags.constructing=aconstructing?1:0; }
105: bool get_constructing() { return flags.constructing!=0; }
1.19 paf 106:
1.28 paf 107: void set_in_expression(bool ain_expression) { flags.in_expression=ain_expression?1:0; }
108: bool get_in_expression() { return flags.in_expression!=0; }
109:
1.25 paf 110: void set_somebody_entered_some_class() { flags.entered_class=1; }
1.20 paf 111: bool get_somebody_entered_some_class() { return flags.entered_class!=0; }
1.14 paf 112:
1.39 paf 113: private:
114:
115: void detach_junctions();
116:
1.1 paf 117: protected:
1.7 paf 118: String& fstring;
1.43 paf 119: Value* fvalue;
1.1 paf 120: private:
1.19 paf 121: struct {
1.20 paf 122: int constructing:1;
1.28 paf 123: int in_expression:1;
1.20 paf 124: int entered_object:1;
125: int entered_class:1;
126: } flags;
1.39 paf 127:
128: private:
129:
130: WContext *fparent;
1.43 paf 131: Array<Junction*> junctions;
1.38 paf 132:
1.1 paf 133: };
134:
135: #endif
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