Annotation of parser3/src/types/pa_vhash.h, revision 1.43.2.14.2.2
1.10 paf 1: /** @file
2: Parser: @b hash parser type decl.
3:
1.43.2.7 paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.29 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_VHASH_H
9: #define PA_VHASH_H
1.34 paf 10:
1.43.2.14.2.2! (paf 11:: static const char* IDENT_VHASH_H="$Date: 2003/03/18 15:14:21 $";
1.1 paf 12:
1.13 paf 13: #include "classes.h"
1.1 paf 14: #include "pa_value.h"
15: #include "pa_hash.h"
1.21 parser 16: #include "pa_vint.h"
1.43.2.2 paf 17: #include "pa_globals.h"
1.1 paf 18:
1.39 paf 19: // defines
20:
21: #define VHASH_TYPE "hash"
1.42 paf 22: #define HASH_FIELDS_NAME "fields"
1.39 paf 23:
1.26 paf 24: // externs
25:
1.43.2.14.2.2! (paf 26:: extern Methoded* hash_class;
1.43.2.14.2.1 (paf 27:: extern const String& hash_default_element_name;
1.13 paf 28:
1.26 paf 29: // forwards
30:
31: class VHash_lock;
32:
1.11 paf 33: /// value of type 'hash', implemented with Hash
1.43.2.2 paf 34: class VHash: public VStateless_object {
1.26 paf 35: friend class VHash_lock;
1.1 paf 36: public: // value
37:
1.43.2.7 paf 38: override const char* type() const { return VHASH_TYPE; }
1.43.2.14.2.2! (paf 39:: override VStateless_class *get_class() { return hash_class; }
1.17 parser 40:
1.19 parser 41: /// VHash: finteger
1.43.2.2 paf 42: override int as_int() const { return fhash.count(); }
1.19 parser 43: /// VHash: finteger
1.43.2.1 paf 44: override double as_double() const { return as_int(); }
1.17 parser 45: /// VHash: count!=0
1.43.2.1 paf 46: override bool is_defined() const { return as_int()!=0; }
1.23 parser 47: /// VHash: count!=0
1.43.2.1 paf 48: override bool as_bool() const { return is_defined(); }
1.20 parser 49: /// VHash: count
1.43.2.14.2.2! (paf 50:: override Value* as_expr_result(bool ) { return new VInt(as_int()); }
1.1 paf 51:
1.11 paf 52: /// VHash: fhash
1.43.2.14.2.1 (paf 53:: override HashStringValue *get_hash(const String* source) { return &hash(source); }
1.14 paf 54:
1.11 paf 55: /// VHash: (key)=value
1.43.2.14.2.2! (paf 56:: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.36 paf 57: // $method
1.43.2.14.2.2! (paf 58:: if(Value* result=VStateless_object::get_element(aname, aself, looking_up))
1.13 paf 59: return result;
1.42 paf 60:
61: // $fields -- pseudo field to make 'hash' more like 'table'
1.43.2.14.2.2! (paf 62:: if(aname == HASH_FIELDS_NAME)
! 63:: return this;
1.13 paf 64:
65: // $element
1.43.2.14.2.2! (paf 66:: if(Value* result=fhash.get(aname))
1.16 parser 67: return result;
68:
69: // default value
1.22 parser 70: return get_default();
1.1 paf 71: }
72:
1.11 paf 73: /// VHash: (key)=value
1.43.2.14.2.2! (paf 74:: override bool put_element(const String& aname, Value* avalue, bool /*replace*/) {
1.43.2.2 paf 75: if(flocked) {
1.40 paf 76: if(!fhash.put_replace(aname, avalue))
77: throw Exception("parser.runtime",
1.43.2.14.2.2! (paf 78:: &aname,
1.43.2.2 paf 79: "can not insert new hash key (hash flocked)");
1.40 paf 80: } else
81: fhash.put(aname, avalue);
1.36 paf 82:
83: return true;
1.1 paf 84: }
85:
86: public: // usage
87:
1.43.2.2 paf 88: VHash(): flocked(false) {}
1.18 parser 89:
1.43.2.2 paf 90: VHash(const HashStringValue& source): fhash(source), flocked(false) {}
1.7 paf 91:
1.43.2.14.2.1 (paf 92:: HashStringValue& hash(const String* source) {
1.26 paf 93: check_lock(source);
1.43.2.8 paf 94: return fhash;
1.26 paf 95: }
1.43.2.11 paf 96:
97: HashStringValue& hash() { return fhash; }
1.1 paf 98:
1.43.2.14.2.2! (paf 99:: void set_default(Value* adefault) {
1.43.2.14 paf 100: fhash.put(hash_default_element_name, adefault);
101: }
1.43.2.14.2.2! (paf 102:: Value* get_default() {
1.43.2.14 paf 103: return fhash.get(hash_default_element_name);
104: }
1.13 paf 105:
1.43.2.14.2.1 (paf 106:: void check_lock(const String* source) {
1.43.2.2 paf 107: if(flocked)
1.30 paf 108: throw Exception("parser.runtime",
1.26 paf 109: source,
1.43.2.2 paf 110: "can not modify hash (flocked)");
1.26 paf 111: }
112:
1.1 paf 113: private:
1.6 paf 114:
1.43.2.2 paf 115: bool flocked;
116: HashStringValue fhash;
1.26 paf 117:
118: };
1.43.2.5 paf 119: DECLARE_OBJECT_PTR(VHash);
1.26 paf 120:
121: class VHash_lock {
122: VHash& fhash;
123: bool saved;
124: public:
1.43.2.2 paf 125: VHash_lock(VHash& ahash): fhash(ahash) {
126: saved=fhash.flocked;
127: fhash.flocked=true;
1.26 paf 128: }
129: ~VHash_lock() {
1.43.2.2 paf 130: fhash.flocked=saved;
1.26 paf 131: }
1.6 paf 132:
1.1 paf 133: };
134:
135: #endif
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