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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2003-2018 Apple Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#pragma once
#include "ButterflyInlines.h"
#include "Error.h"
#include "ExceptionHelpers.h"
#include "JSArray.h"
#include "JSGlobalObject.h"
#include "JSString.h"
#include "JSCInlines.h"
#include "RegExpGlobalDataInlines.h"
#include "RegExpMatchesArray.h"
#include "RegExpObject.h"
namespace JSC {
ALWAYS_INLINE unsigned getRegExpObjectLastIndexAsUnsigned(
JSGlobalObject* globalObject, RegExpObject* regExpObject, const String& input)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue jsLastIndex = regExpObject->getLastIndex();
unsigned lastIndex;
if (LIKELY(jsLastIndex.isUInt32())) {
lastIndex = jsLastIndex.asUInt32();
if (lastIndex > input.length())
return UINT_MAX;
} else {
double doubleLastIndex = jsLastIndex.toIntegerOrInfinity(globalObject);
RETURN_IF_EXCEPTION(scope, UINT_MAX);
if (doubleLastIndex > input.length())
return UINT_MAX;
lastIndex = (doubleLastIndex < 0) ? 0 : static_cast<unsigned>(doubleLastIndex);
}
return lastIndex;
}
inline JSValue RegExpObject::execInline(JSGlobalObject* globalObject, JSString* string)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
RegExp* regExp = this->regExp();
String input = string->value(globalObject);
RETURN_IF_EXCEPTION(scope, { });
bool globalOrSticky = regExp->globalOrSticky();
unsigned lastIndex = getRegExpObjectLastIndexAsUnsigned(globalObject, this, input);
RETURN_IF_EXCEPTION(scope, { });
if (lastIndex == UINT_MAX && globalOrSticky) {
scope.release();
setLastIndex(globalObject, 0);
return jsNull();
}
if (!globalOrSticky)
lastIndex = 0;
MatchResult result;
JSArray* array =
createRegExpMatchesArray(vm, globalObject, string, input, regExp, lastIndex, result);
if (!array) {
RETURN_IF_EXCEPTION(scope, { });
scope.release();
if (globalOrSticky)
setLastIndex(globalObject, 0);
return jsNull();
}
if (globalOrSticky)
setLastIndex(globalObject, result.end);
RETURN_IF_EXCEPTION(scope, { });
globalObject->regExpGlobalData().recordMatch(vm, globalObject, regExp, string, result);
return array;
}
// Shared implementation used by test and exec.
inline MatchResult RegExpObject::matchInline(
JSGlobalObject* globalObject, JSString* string)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
RegExp* regExp = this->regExp();
String input = string->value(globalObject);
RETURN_IF_EXCEPTION(scope, { });
if (!regExp->global() && !regExp->sticky()) {
scope.release();
return globalObject->regExpGlobalData().performMatch(globalObject, regExp, string, input, 0);
}
unsigned lastIndex = getRegExpObjectLastIndexAsUnsigned(globalObject, this, input);
RETURN_IF_EXCEPTION(scope, { });
if (lastIndex == UINT_MAX) {
scope.release();
setLastIndex(globalObject, 0);
return MatchResult::failed();
}
MatchResult result = globalObject->regExpGlobalData().performMatch(globalObject, regExp, string, input, lastIndex);
RETURN_IF_EXCEPTION(scope, { });
scope.release();
setLastIndex(globalObject, result.end);
return result;
}
inline unsigned advanceStringUnicode(String s, unsigned length, unsigned currentIndex)
{
if (currentIndex + 1 >= length)
return currentIndex + 1;
UChar first = s[currentIndex];
if (first < 0xD800 || first > 0xDBFF)
return currentIndex + 1;
UChar second = s[currentIndex + 1];
if (second < 0xDC00 || second > 0xDFFF)
return currentIndex + 1;
return currentIndex + 2;
}
template<typename FixEndFunc>
JSValue collectMatches(VM& vm, JSGlobalObject* globalObject, JSString* string, const String& s, RegExp* regExp, const FixEndFunc& fixEnd)
{
auto scope = DECLARE_THROW_SCOPE(vm);
MatchResult result = globalObject->regExpGlobalData().performMatch(globalObject, regExp, string, s, 0);
RETURN_IF_EXCEPTION(scope, { });
if (!result)
return jsNull();
static unsigned maxSizeForDirectPath = 100000;
JSArray* array = constructEmptyArray(globalObject, nullptr);
RETURN_IF_EXCEPTION(scope, { });
bool hasException = false;
unsigned arrayIndex = 0;
auto iterate = [&] () {
size_t end = result.end;
size_t length = end - result.start;
array->putDirectIndex(globalObject, arrayIndex++, jsSubstringOfResolved(vm, string, result.start, length));
if (UNLIKELY(scope.exception())) {
hasException = true;
return;
}
if (!length)
end = fixEnd(end);
result = globalObject->regExpGlobalData().performMatch(globalObject, regExp, string, s, end);
if (UNLIKELY(scope.exception())) {
hasException = true;
return;
}
};
do {
if (array->length() >= maxSizeForDirectPath) {
// First do a throw-away match to see how many matches we'll get.
unsigned matchCount = 0;
MatchResult savedResult = result;
do {
if (array->length() + matchCount > MAX_STORAGE_VECTOR_LENGTH) {
throwOutOfMemoryError(globalObject, scope);
return jsUndefined();
}
size_t end = result.end;
matchCount++;
if (result.empty())
end = fixEnd(end);
// Using RegExpGlobalData::performMatch() instead of calling RegExp::match()
// directly is a surprising but profitable choice: it means that when we do OOM, we
// will leave the cached result in the state it ought to have had just before the
// OOM! On the other hand, if this loop concludes that the result is small enough,
// then the iterate() loop below will overwrite the cached result anyway.
result = globalObject->regExpGlobalData().performMatch(globalObject, regExp, string, s, end);
RETURN_IF_EXCEPTION(scope, { });
} while (result);
// OK, we have a sensible number of matches. Now we can create them for reals.
result = savedResult;
do {
iterate();
EXCEPTION_ASSERT(!!scope.exception() == hasException);
if (UNLIKELY(hasException))
return { };
} while (result);
return array;
}
iterate();
EXCEPTION_ASSERT(!!scope.exception() == hasException);
if (UNLIKELY(hasException))
return { };
} while (result);
return array;
}
} // namespace JSC
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