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 "UString.h"
  26
  27 namespace JSC {
  28
  29     class ExecState;
  30
  31     class Identifier {
  32         friend class Structure;
  33     public:
  34         Identifier() { }
  35
  36         Identifier(ExecState* exec, const char* s) : _ustring(add(exec, s)) { } // Only to be used with string literals.
  37         Identifier(ExecState* exec, const UChar* s, int length) : _ustring(add(exec, s, length)) { }
  38         Identifier(ExecState* exec, UString::Rep* rep) : _ustring(add(exec, rep)) { }
  39         Identifier(ExecState* exec, const UString& s) : _ustring(add(exec, s.rep())) { }
  40
  41         Identifier(JSGlobalData* globalData, const char* s) : _ustring(add(globalData, s)) { } // Only to be used with string literals.
  42         Identifier(JSGlobalData* globalData, const UChar* s, int length) : _ustring(add(globalData, s, length)) { }
  43         Identifier(JSGlobalData* globalData, UString::Rep* rep) : _ustring(add(globalData, rep)) { }
  44         Identifier(JSGlobalData* globalData, const UString& s) : _ustring(add(globalData, s.rep())) { }
  45
  46         // Special constructor for cases where we overwrite an object in place.
  47         Identifier(PlacementNewAdoptType) : _ustring(PlacementNewAdopt) { }
  48
  49         const UString& ustring() const { return _ustring; }
  50
  51         const UChar* data() const { return _ustring.data(); }
  52         int size() const { return _ustring.size(); }
  53
  54         const char* ascii() const { return _ustring.ascii(); }
  55
  56         static Identifier from(ExecState* exec, unsigned y) { return Identifier(exec, UString::from(y)); }
  57
  58         bool isNull() const { return _ustring.isNull(); }
  59         bool isEmpty() const { return _ustring.isEmpty(); }
  60
  61         uint32_t toUInt32(bool* ok) const { return _ustring.toUInt32(ok); }
  62         uint32_t toUInt32(bool* ok, bool tolerateEmptyString) const { return _ustring.toUInt32(ok, tolerateEmptyString); };
  63         uint32_t toStrictUInt32(bool* ok) const { return _ustring.toStrictUInt32(ok); }
  64         unsigned toArrayIndex(bool* ok) const { return _ustring.toArrayIndex(ok); }
  65         double toDouble() const { return _ustring.toDouble(); }
  66
  67         friend bool operator==(const Identifier&, const Identifier&);
  68         friend bool operator!=(const Identifier&, const Identifier&);
  69
  70         friend bool operator==(const Identifier&, const char*);
  71         friend bool operator!=(const Identifier&, const char*);
  72
  73         static void remove(UString::Rep*);
  74
  75         static bool equal(const UString::Rep*, const char*);
  76         static bool equal(const UString::Rep*, const UChar*, int length);
  77         static bool equal(const UString::Rep* a, const UString::Rep* b) { return JSC::equal(a, b); }
  78
  79         static PassRefPtr<UString::Rep> add(ExecState*, const char*); // Only to be used with string literals.
  80         static PassRefPtr<UString::Rep> add(JSGlobalData*, const char*); // Only to be used with string literals.
  81
  82     private:
  83         UString _ustring;
  84
  85         static bool equal(const Identifier& a, const Identifier& b) { return a._ustring.rep() == b._ustring.rep(); }
  86         static bool equal(const Identifier& a, const char* b) { return equal(a._ustring.rep(), b); }
  87
  88         static PassRefPtr<UString::Rep> add(ExecState*, const UChar*, int length);
  89         static PassRefPtr<UString::Rep> add(JSGlobalData*, const UChar*, int length);
  90
  91         static PassRefPtr<UString::Rep> add(ExecState* exec, UString::Rep* r)
  92         {
  93             if (r->identifierTable()) {
  94 #ifndef NDEBUG
  95                 checkSameIdentifierTable(exec, r);
  96 #endif
  97                 return r;
  98             }
  99             return addSlowCase(exec, r);
 100         }
 101         static PassRefPtr<UString::Rep> add(JSGlobalData* globalData, UString::Rep* r)
 102         {
 103             if (r->identifierTable()) {
 104 #ifndef NDEBUG
 105                 checkSameIdentifierTable(globalData, r);
 106 #endif
 107                 return r;
 108             }
 109             return addSlowCase(globalData, r);
 110         }
 111
 112         static PassRefPtr<UString::Rep> addSlowCase(ExecState*, UString::Rep* r);
 113         static PassRefPtr<UString::Rep> addSlowCase(JSGlobalData*, UString::Rep* r);
 114
 115         static void checkSameIdentifierTable(ExecState*, UString::Rep*);
 116         static void checkSameIdentifierTable(JSGlobalData*, UString::Rep*);
 117     };
 118
 119     inline bool operator==(const Identifier& a, const Identifier& b)
 120     {
 121         return Identifier::equal(a, b);
 122     }
 123
 124     inline bool operator!=(const Identifier& a, const Identifier& b)
 125     {
 126         return !Identifier::equal(a, b);
 127     }
 128
 129     inline bool operator==(const Identifier& a, const char* b)
 130     {
 131         return Identifier::equal(a, b);
 132     }
 133
 134     inline bool operator!=(const Identifier& a, const char* b)
 135     {
 136         return !Identifier::equal(a, b);
 137     }
 138
 139     IdentifierTable* createIdentifierTable();
 140     void deleteIdentifierTable(IdentifierTable*);
 141
 142 } // namespace JSC
 143
 144 #endif // Identifier_h