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