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 "RegExpCachedResult.h"
  27 #include "RegExpObject.h"
  28 #include <wtf/OwnPtr.h>
  29
  30
  31 namespace JSC {
  32
  33     class RegExpPrototype;
  34
  35     class RegExpConstructor : public InternalFunction {
  36     public:
  37         typedef InternalFunction Base;
  38
  39         static RegExpConstructor* create(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, RegExpPrototype* regExpPrototype)
  40         {
  41             RegExpConstructor* constructor = new (NotNull, allocateCell<RegExpConstructor>(*exec->heap())) RegExpConstructor(globalObject, structure, regExpPrototype);
  42             constructor->finishCreation(exec, regExpPrototype);
  43             return constructor;
  44         }
  45
  46         static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
  47         {
  48             return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), &s_info);
  49         }
  50
  51         static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
  52
  53         static bool getOwnPropertySlot(JSCell*, ExecState*, PropertyName, PropertySlot&);
  54         static bool getOwnPropertyDescriptor(JSObject*, ExecState*, PropertyName, PropertyDescriptor&);
  55
  56         static const ClassInfo s_info;
  57
  58         MatchResult performMatch(VM&, RegExp*, JSString*, const String&, int startOffset, int** ovector);
  59         MatchResult performMatch(VM&, RegExp*, JSString*, const String&, int startOffset);
  60
  61         void setMultiline(bool multiline) { m_multiline = multiline; }
  62         bool multiline() const { return m_multiline; }
  63
  64         JSValue getBackref(ExecState*, unsigned);
  65         JSValue getLastParen(ExecState*);
  66         JSValue getLeftContext(ExecState*);
  67         JSValue getRightContext(ExecState*);
  68
  69         void setInput(ExecState* exec, JSString* string) { m_cachedResult.setInput(exec, this, string); }
  70         JSString* input() { return m_cachedResult.input(); }
  71
  72         static void visitChildren(JSCell*, SlotVisitor&);
  73
  74     protected:
  75         void finishCreation(ExecState*, RegExpPrototype*);
  76         static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesVisitChildren | Base::StructureFlags;
  77
  78     private:
  79         RegExpConstructor(JSGlobalObject*, Structure*, RegExpPrototype*);
  80         static void destroy(JSCell*);
  81         static ConstructType getConstructData(JSCell*, ConstructData&);
  82         static CallType getCallData(JSCell*, CallData&);
  83
  84         RegExpCachedResult m_cachedResult;
  85         bool m_multiline;
  86         Vector<int, 32> m_ovector;
  87     };
  88
  89     RegExpConstructor* asRegExpConstructor(JSValue);
  90
  91     JSObject* constructRegExp(ExecState*, JSGlobalObject*, const ArgList&, bool callAsConstructor = false);
  92
  93     inline RegExpConstructor* asRegExpConstructor(JSValue value)
  94     {
  95         ASSERT(asObject(value)->inherits(&RegExpConstructor::s_info));
  96         return static_cast<RegExpConstructor*>(asObject(value));
  97     }
  98
  99     /*
 100       To facilitate result caching, exec(), test(), match(), search(), and replace() dipatch regular
 101       expression matching through the performMatch function. We use cached results to calculate,
 102       e.g., RegExp.lastMatch and RegExp.leftParen.
 103     */
 104     ALWAYS_INLINE MatchResult RegExpConstructor::performMatch(VM& vm, RegExp* regExp, JSString* string, const String& input, int startOffset, int** ovector)
 105     {
 106         int position = regExp->match(vm, input, startOffset, m_ovector);
 107
 108         if (ovector)
 109             *ovector = m_ovector.data();
 110
 111         if (position == -1)
 112             return MatchResult::failed();
 113
 114         ASSERT(!m_ovector.isEmpty());
 115         ASSERT(m_ovector[0] == position);
 116         ASSERT(m_ovector[1] >= position);
 117         size_t end = m_ovector[1];
 118
 119         m_cachedResult.record(vm, this, regExp, string, MatchResult(position, end));
 120
 121         return MatchResult(position, end);
 122     }
 123     ALWAYS_INLINE MatchResult RegExpConstructor::performMatch(VM& vm, RegExp* regExp, JSString* string, const String& input, int startOffset)
 124     {
 125         MatchResult result = regExp->match(vm, input, startOffset);
 126         if (result)
 127             m_cachedResult.record(vm, this, regExp, string, result);
 128         return result;
 129     }
 130
 131 } // namespace JSC
 132
 133 #endif // RegExpConstructor_h