runtime/Identifier.h

   1 /*
   2  *  Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Library General Public License
  15  *  along with this library; see the file COPYING.LIB.  If not, write to
  16  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  *  Boston, MA 02110-1301, USA.
  18  *
  19  */
  20
  21 #ifndef Identifier_h
  22 #define Identifier_h
  23
  24 #include "JSGlobalData.h"
  25 #include "ThreadSpecific.h"
  26 #include "UString.h"
  27
  28 namespace JSC {
  29
  30     class ExecState;
  31
  32     class Identifier {
  33         friend class Structure;
  34     public:
  35         Identifier() { }
  36
  37         Identifier(ExecState* exec, const char* s) : _ustring(add(exec, s)) { } // Only to be used with string literals.
  38         Identifier(ExecState* exec, const UChar* s, int length) : _ustring(add(exec, s, length)) { }
  39         Identifier(ExecState* exec, UString::Rep* rep) : _ustring(add(exec, rep)) { }
  40         Identifier(ExecState* exec, const UString& s) : _ustring(add(exec, s.rep())) { }
  41
  42         Identifier(JSGlobalData* globalData, const char* s) : _ustring(add(globalData, s)) { } // Only to be used with string literals.
  43         Identifier(JSGlobalData* globalData, const UChar* s, int length) : _ustring(add(globalData, s, length)) { }
  44         Identifier(JSGlobalData* globalData, UString::Rep* rep) : _ustring(add(globalData, rep)) { }
  45         Identifier(JSGlobalData* globalData, const UString& s) : _ustring(add(globalData, s.rep())) { }
  46
  47         // Special constructor for cases where we overwrite an object in place.
  48         Identifier(PlacementNewAdoptType) : _ustring(PlacementNewAdopt) { }
  49
  50         const UString& ustring() const { return _ustring; }
  51
  52         const UChar* data() const { return _ustring.data(); }
  53         int size() const { return _ustring.size(); }
  54
  55         const char* ascii() const { return _ustring.ascii(); }
  56
  57         static Identifier from(ExecState* exec, unsigned y);
  58         static Identifier from(ExecState* exec, int y);
  59         static Identifier from(ExecState* exec, double y);
  60
  61         bool isNull() const { return _ustring.isNull(); }
  62         bool isEmpty() const { return _ustring.isEmpty(); }
  63
  64         uint32_t toUInt32(bool* ok) const { return _ustring.toUInt32(ok); }
  65         uint32_t toUInt32(bool* ok, bool tolerateEmptyString) const { return _ustring.toUInt32(ok, tolerateEmptyString); };
  66         uint32_t toStrictUInt32(bool* ok) const { return _ustring.toStrictUInt32(ok); }
  67         unsigned toArrayIndex(bool* ok) const { return _ustring.toArrayIndex(ok); }
  68         double toDouble() const { return _ustring.toDouble(); }
  69
  70         friend bool operator==(const Identifier&, const Identifier&);
  71         friend bool operator!=(const Identifier&, const Identifier&);
  72
  73         friend bool operator==(const Identifier&, const char*);
  74         friend bool operator!=(const Identifier&, const char*);
  75
  76         static bool equal(const UString::Rep*, const char*);
  77         static bool equal(const UString::Rep*, const UChar*, unsigned length);
  78         static bool equal(const UString::Rep* a, const UString::Rep* b) { return ::equal(a, b); }
  79
  80         static PassRefPtr<UString::Rep> add(ExecState*, const char*); // Only to be used with string literals.
  81         static PassRefPtr<UString::Rep> add(JSGlobalData*, const char*); // Only to be used with string literals.
  82
  83     private:
  84         UString _ustring;
  85
  86         static bool equal(const Identifier& a, const Identifier& b) { return a._ustring.rep() == b._ustring.rep(); }
  87         static bool equal(const Identifier& a, const char* b) { return equal(a._ustring.rep(), b); }
  88
  89         static PassRefPtr<UString::Rep> add(ExecState*, const UChar*, int length);
  90         static PassRefPtr<UString::Rep> add(JSGlobalData*, const UChar*, int length);
  91
  92         static PassRefPtr<UString::Rep> add(ExecState* exec, UString::Rep* r)
  93         {
  94 #ifndef NDEBUG
  95             checkCurrentIdentifierTable(exec);
  96 #endif
  97             if (r->isIdentifier())
  98                 return r;
  99             return addSlowCase(exec, r);
 100         }
 101         static PassRefPtr<UString::Rep> add(JSGlobalData* globalData, UString::Rep* r)
 102         {
 103 #ifndef NDEBUG
 104             checkCurrentIdentifierTable(globalData);
 105 #endif
 106             if (r->isIdentifier())
 107                 return r;
 108             return addSlowCase(globalData, r);
 109         }
 110
 111         static PassRefPtr<UString::Rep> addSlowCase(ExecState*, UString::Rep* r);
 112         static PassRefPtr<UString::Rep> addSlowCase(JSGlobalData*, UString::Rep* r);
 113
 114         static void checkCurrentIdentifierTable(ExecState*);
 115         static void checkCurrentIdentifierTable(JSGlobalData*);
 116     };
 117
 118     inline bool operator==(const Identifier& a, const Identifier& b)
 119     {
 120         return Identifier::equal(a, b);
 121     }
 122
 123     inline bool operator!=(const Identifier& a, const Identifier& b)
 124     {
 125         return !Identifier::equal(a, b);
 126     }
 127
 128     inline bool operator==(const Identifier& a, const char* b)
 129     {
 130         return Identifier::equal(a, b);
 131     }
 132
 133     inline bool operator!=(const Identifier& a, const char* b)
 134     {
 135         return !Identifier::equal(a, b);
 136     }
 137
 138     IdentifierTable* createIdentifierTable();
 139     void deleteIdentifierTable(IdentifierTable*);
 140
 141 } // namespace JSC
 142
 143 #endif // Identifier_h