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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RegExpCachedResult_h
#define RegExpCachedResult_h
#include "RegExpObject.h"
namespace JSC {
class JSString;
class RegExpMatchesArray;
// RegExpCachedResult is used to track the cached results of the last
// match, stores on the RegExp constructor (e.g. $&, $_, $1, $2 ...).
// These values will be lazily generated on demand, so the cached result
// may be in a lazy or reified state. A lazy state is indicated by a
// value of m_result indicating a successful match, and a reified state
// is indicated by setting m_result to MatchResult::failed().
// Following a successful match, m_result, m_lastInput and m_lastRegExp
// can be used to reify the results from the match, following reification
// m_reifiedResult and m_reifiedInput hold the cached results.
class RegExpCachedResult {
public:
RegExpCachedResult(VM& vm, JSObject* owner, RegExp* emptyRegExp)
: m_result(0, 0)
{
m_lastInput.set(vm, owner, jsEmptyString(&vm));
m_lastRegExp.set(vm, owner, emptyRegExp);
}
ALWAYS_INLINE void record(VM& vm, JSObject* owner, RegExp* regExp, JSString* input, MatchResult result)
{
m_lastRegExp.set(vm, owner, regExp);
m_lastInput.set(vm, owner, input);
m_result = result;
}
RegExpMatchesArray* lastResult(ExecState*, JSObject* owner);
void setInput(ExecState*, JSObject* owner, JSString*);
JSString* input()
{
// If m_result showas a match then we're in a lazy state, so m_lastInput
// is the most recent value of the input property. If not then we have
// reified, in which case m_reifiedInput will contain the correct value.
return m_result ? m_lastInput.get() : m_reifiedInput.get();
}
void visitChildren(SlotVisitor&);
private:
MatchResult m_result;
WriteBarrier<JSString> m_lastInput;
WriteBarrier<RegExp> m_lastRegExp;
WriteBarrier<RegExpMatchesArray> m_reifiedResult;
WriteBarrier<JSString> m_reifiedInput;
};
} // namespace JSC
#endif // RegExpCachedResult_h
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