runtime/RegExpConstructor.h

   1 /*
   2  *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2003, 2007, 2008 Apple Inc. All Rights Reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #ifndef RegExpConstructor_h
  22 #define RegExpConstructor_h
  23
  24 #include "InternalFunction.h"
  25 #include "RegExp.h"
  26 #include <wtf/OwnPtr.h>
  27
  28 namespace JSC {
  29
  30     class RegExp;
  31     class RegExpPrototype;
  32     struct RegExpConstructorPrivate;
  33
  34     struct RegExpConstructorPrivate : FastAllocBase {
  35         // Global search cache / settings
  36         RegExpConstructorPrivate()
  37             : lastNumSubPatterns(0)
  38             , multiline(false)
  39             , lastOvectorIndex(0)
  40         {
  41         }
  42
  43         const Vector<int, 32>& lastOvector() const { return ovector[lastOvectorIndex]; }
  44         Vector<int, 32>& lastOvector() { return ovector[lastOvectorIndex]; }
  45         Vector<int, 32>& tempOvector() { return ovector[lastOvectorIndex ? 0 : 1]; }
  46         void changeLastOvector() { lastOvectorIndex = lastOvectorIndex ? 0 : 1; }
  47
  48         UString input;
  49         UString lastInput;
  50         Vector<int, 32> ovector[2];
  51         unsigned lastNumSubPatterns : 30;
  52         bool multiline : 1;
  53         unsigned lastOvectorIndex : 1;
  54     };
  55
  56     class RegExpConstructor : public InternalFunction {
  57     public:
  58         RegExpConstructor(ExecState*, NonNullPassRefPtr<Structure>, RegExpPrototype*);
  59
  60         static PassRefPtr<Structure> createStructure(JSValue prototype)
  61         {
  62             return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
  63         }
  64
  65         virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
  66         virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
  67         virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
  68
  69         static const ClassInfo info;
  70
  71         void performMatch(RegExp*, const UString&, int startOffset, int& position, int& length, int** ovector = 0);
  72         JSObject* arrayOfMatches(ExecState*) const;
  73
  74         void setInput(const UString&);
  75         const UString& input() const;
  76
  77         void setMultiline(bool);
  78         bool multiline() const;
  79
  80         JSValue getBackref(ExecState*, unsigned) const;
  81         JSValue getLastParen(ExecState*) const;
  82         JSValue getLeftContext(ExecState*) const;
  83         JSValue getRightContext(ExecState*) const;
  84
  85     protected:
  86         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | ImplementsHasInstance | InternalFunction::StructureFlags;
  87
  88     private:
  89         virtual ConstructType getConstructData(ConstructData&);
  90         virtual CallType getCallData(CallData&);
  91
  92         virtual const ClassInfo* classInfo() const { return &info; }
  93
  94         OwnPtr<RegExpConstructorPrivate> d;
  95     };
  96
  97     RegExpConstructor* asRegExpConstructor(JSValue);
  98
  99     JSObject* constructRegExp(ExecState*, const ArgList&);
 100
 101     inline RegExpConstructor* asRegExpConstructor(JSValue value)
 102     {
 103         ASSERT(asObject(value)->inherits(&RegExpConstructor::info));
 104         return static_cast<RegExpConstructor*>(asObject(value));
 105     }
 106
 107     /*
 108       To facilitate result caching, exec(), test(), match(), search(), and replace() dipatch regular
 109       expression matching through the performMatch function. We use cached results to calculate,
 110       e.g., RegExp.lastMatch and RegExp.leftParen.
 111     */
 112     inline void RegExpConstructor::performMatch(RegExp* r, const UString& s, int startOffset, int& position, int& length, int** ovector)
 113     {
 114         position = r->match(s, startOffset, &d->tempOvector());
 115
 116         if (ovector)
 117             *ovector = d->tempOvector().data();
 118
 119         if (position != -1) {
 120             ASSERT(!d->tempOvector().isEmpty());
 121
 122             length = d->tempOvector()[1] - d->tempOvector()[0];
 123
 124             d->input = s;
 125             d->lastInput = s;
 126             d->changeLastOvector();
 127             d->lastNumSubPatterns = r->numSubpatterns();
 128         }
 129     }
 130
 131 } // namespace JSC
 132
 133 #endif // RegExpConstructor_h