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      1 /*
      2  *  Copyright (C) 1999-2000 Harri Porten (porten (at) 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 {
     35         WTF_MAKE_FAST_ALLOCATED;
     36     public:
     37         // Global search cache / settings
     38         RegExpConstructorPrivate()
     39             : lastNumSubPatterns(0)
     40             , multiline(false)
     41             , lastOvectorIndex(0)
     42         {
     43         }
     44 
     45         const Vector<int, 32>& lastOvector() const { return ovector[lastOvectorIndex]; }
     46         Vector<int, 32>& lastOvector() { return ovector[lastOvectorIndex]; }
     47         Vector<int, 32>& tempOvector() { return ovector[lastOvectorIndex ? 0 : 1]; }
     48         void changeLastOvector() { lastOvectorIndex = lastOvectorIndex ? 0 : 1; }
     49 
     50         UString input;
     51         UString lastInput;
     52         Vector<int, 32> ovector[2];
     53         unsigned lastNumSubPatterns : 30;
     54         bool multiline : 1;
     55         unsigned lastOvectorIndex : 1;
     56     };
     57 
     58     class RegExpConstructor : public InternalFunction {
     59     public:
     60         RegExpConstructor(ExecState*, JSGlobalObject*, Structure*, RegExpPrototype*);
     61 
     62         static Structure* createStructure(JSGlobalData& globalData, JSValue prototype)
     63         {
     64             return Structure::create(globalData, prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
     65         }
     66 
     67         virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
     68         virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
     69         virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
     70 
     71         static const ClassInfo s_info;
     72 
     73         void performMatch(RegExp*, const UString&, int startOffset, int& position, int& length, int** ovector = 0);
     74         JSObject* arrayOfMatches(ExecState*) const;
     75 
     76         void setInput(const UString&);
     77         const UString& input() const;
     78 
     79         void setMultiline(bool);
     80         bool multiline() const;
     81 
     82         JSValue getBackref(ExecState*, unsigned) const;
     83         JSValue getLastParen(ExecState*) const;
     84         JSValue getLeftContext(ExecState*) const;
     85         JSValue getRightContext(ExecState*) const;
     86 
     87     protected:
     88         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | ImplementsHasInstance | InternalFunction::StructureFlags;
     89 
     90     private:
     91         virtual ConstructType getConstructData(ConstructData&);
     92         virtual CallType getCallData(CallData&);
     93 
     94         OwnPtr<RegExpConstructorPrivate> d;
     95     };
     96 
     97     RegExpConstructor* asRegExpConstructor(JSValue);
     98 
     99     JSObject* constructRegExp(ExecState*, JSGlobalObject*, const ArgList&);
    100 
    101     inline RegExpConstructor* asRegExpConstructor(JSValue value)
    102     {
    103         ASSERT(asObject(value)->inherits(&RegExpConstructor::s_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     ALWAYS_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
    134