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	1	/*
	2	* Copyright (C) 2012 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#ifndef RegExpCachedResult_h
	27	#define RegExpCachedResult_h
	28
	29	#include "RegExpObject.h"
	30
	31	namespace JSC {
	32
	33	class JSString;
	34	class RegExpMatchesArray;
	35
	36	// RegExpCachedResult is used to track the cached results of the last
	37	// match, stores on the RegExp constructor (e.g. $&, $_, $1, $2 ...).
	38	// These values will be lazily generated on demand, so the cached result
	39	// may be in a lazy or reified state. A lazy state is indicated by a
	40	// value of m_result indicating a successful match, and a reified state
	41	// is indicated by setting m_result to MatchResult::failed().
	42	// Following a successful match, m_result, m_lastInput and m_lastRegExp
	43	// can be used to reify the results from the match, following reification
	44	// m_reifiedResult and m_reifiedInput hold the cached results.
	45	class RegExpCachedResult {
	46	public:
	47	RegExpCachedResult(JSGlobalData& globalData, JSObject* owner, RegExp* emptyRegExp)
	48	: m_result(0, 0)
	49	{
	50	m_lastInput.set(globalData, owner, jsEmptyString(&globalData));
	51	m_lastRegExp.set(globalData, owner, emptyRegExp);
	52	m_reifiedResult.clear();
	53	m_reifiedInput.clear();
	54	}
	55
	56	ALWAYS_INLINE void record(JSGlobalData& globalData, JSObject* owner, RegExp* regExp, JSString* input, MatchResult result)
	57	{
	58	m_lastRegExp.set(globalData, owner, regExp);
	59	m_lastInput.set(globalData, owner, input);
	60	m_result = result;
	61	}
	62
	63	RegExpMatchesArray* lastResult(ExecState, JSObject owner);
	64	void setInput(ExecState, JSObject owner, JSString*);
	65
	66	JSString* input()
	67	{
	68	// If m_result showas a match then we're in a lazy state, so m_lastInput
	69	// is the most recent value of the input property. If not then we have
	70	// reified, in which case m_reifiedInput will contain the correct value.
	71	return m_result ? m_lastInput.get() : m_reifiedInput.get();
	72	}
	73
	74	void visitChildren(SlotVisitor&);
	75
	76	private:
	77	MatchResult m_result;
	78	WriteBarrier<JSString> m_lastInput;
	79	WriteBarrier<RegExp> m_lastRegExp;
	80	WriteBarrier<RegExpMatchesArray> m_reifiedResult;
	81	WriteBarrier<JSString> m_reifiedInput;
	82	};
	83
	84	} // namespace JSC
	85
	86	#endif // RegExpCachedResult_h