Annotation of parser3/src/types/pa_vhash.h, revision 1.63
1.10 paf 1: /** @file
2: Parser: @b hash parser type decl.
3:
1.60 misha 4: Copyright (c) 2001-2009 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:
1.63 ! moko 11: static const char * const IDENT_VHASH_H="$Date: 2009-08-08 13:30:21 $";
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"
1.46 paf 17: #include "pa_globals.h"
1.1 paf 18:
1.39 paf 19: // defines
20:
21: #define VHASH_TYPE "hash"
1.63 ! moko 22:
1.42 paf 23: #define HASH_FIELDS_NAME "fields"
1.47 paf 24: #define HASH_DEFAULT_ELEMENT_NAME "_default"
1.63 ! moko 25: extern const String hash_fields_name, hash_default_element_name;
1.26 paf 26:
1.46 paf 27: extern Methoded* hash_class;
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
1.46 paf 34: class VHash: public VStateless_object {
1.26 paf 35: friend class VHash_lock;
1.1 paf 36: public: // value
37:
1.46 paf 38: override const char* type() const { return VHASH_TYPE; }
39: override VStateless_class *get_class() { return hash_class; }
1.17 parser 40:
1.19 parser 41: /// VHash: finteger
1.46 paf 42: override int as_int() const { return fhash.count(); }
1.19 parser 43: /// VHash: finteger
1.46 paf 44: override double as_double() const { return as_int(); }
1.17 parser 45: /// VHash: count!=0
1.51 paf 46: override bool is_defined() const { return as_bool(); }
1.23 parser 47: /// VHash: count!=0
1.51 paf 48: override bool as_bool() const { return as_int()!=0; }
1.20 parser 49: /// VHash: count
1.46 paf 50: override Value& as_expr_result(bool ) { return *new VInt(as_int()); }
1.1 paf 51:
1.11 paf 52: /// VHash: fhash
1.46 paf 53: override HashStringValue *get_hash() { return &hash(); }
1.14 paf 54:
1.11 paf 55: /// VHash: (key)=value
1.62 misha 56: override Value* get_element(const String& aname) {
1.45 paf 57: // $element
1.46 paf 58: if(Value* result=fhash.get(aname))
1.13 paf 59: return result;
1.42 paf 60:
61: // $fields -- pseudo field to make 'hash' more like 'table'
1.63 ! moko 62: if(aname == hash_fields_name)
1.42 paf 63: return this;
1.13 paf 64:
1.45 paf 65: // $method
1.62 misha 66: if(Value* result=VStateless_object::get_element(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
1.62 misha 74: override const VJunction* put_element(const String& aname, Value* avalue, bool /*replace*/) {
1.63 ! moko 75: if(aname==hash_default_element_name)
1.47 paf 76: set_default(avalue);
77: else
78: if(flocked) {
1.55 paf 79: if(!fhash.put_replaced(aname, avalue))
1.59 misha 80: throw Exception(PARSER_RUNTIME,
1.47 paf 81: &aname,
82: "can not insert new hash key (hash flocked)");
83: } else
84: fhash.put(aname, avalue);
1.36 paf 85:
1.54 paf 86: return PUT_ELEMENT_REPLACED_ELEMENT;
1.1 paf 87: }
1.52 paf 88:
1.61 misha 89: override VFile* as_vfile(String::Language lang, const Request_charsets *charsets=0);
1.1 paf 90:
91: public: // usage
92:
1.47 paf 93: VHash(): flocked(false), _default(0) {}
1.18 parser 94:
1.47 paf 95: VHash(const HashStringValue& source): fhash(source), flocked(false), _default(0) {}
1.7 paf 96:
1.46 paf 97: HashStringValue& hash() {
98: check_lock();
1.26 paf 99: return fhash;
100: }
1.1 paf 101:
1.44 paf 102: void set_default(Value* adefault) {
1.47 paf 103: _default=adefault;
1.22 parser 104: }
1.46 paf 105: Value* get_default() {
1.47 paf 106: return _default;
1.22 parser 107: }
1.53 paf 108:
109: void extract_default();
1.13 paf 110:
1.46 paf 111: void check_lock() {
112: if(flocked)
1.59 misha 113: throw Exception(PARSER_RUNTIME,
1.46 paf 114: 0,
115: "can not modify hash (flocked)");
1.26 paf 116: }
117:
1.1 paf 118: private:
1.6 paf 119:
1.48 paf 120: HashStringValue fhash;
1.46 paf 121: bool flocked;
1.47 paf 122: Value* _default;
1.26 paf 123:
124: };
125:
126: class VHash_lock {
127: VHash& fhash;
128: bool saved;
129: public:
1.46 paf 130: VHash_lock(VHash& ahash): fhash(ahash) {
131: saved=fhash.flocked;
132: fhash.flocked=true;
1.26 paf 133: }
134: ~VHash_lock() {
1.46 paf 135: fhash.flocked=saved;
1.26 paf 136: }
1.6 paf 137:
1.1 paf 138: };
139:
140: #endif
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