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Copy pathYarrPattern.cpp
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3381 lines (2874 loc) · 130 KB
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/*
* Copyright (C) 2009-2023 Apple Inc. All rights reserved.
* Copyright (C) 2010 Peter Varga (pvarga@inf.u-szeged.hu), University of Szeged
* Copyright (C) 2025 Tetsuharu Ohzeki <tetsuharu.ohzeki@gmail.com>.
*
* 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 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.
*/
#include "config.h"
#include "YarrPattern.h"
#include "Options.h"
#include "Yarr.h"
#include "YarrCanonicalize.h"
#include "YarrParser.h"
#include <limits>
#include <wtf/BitSet.h>
#include <wtf/DataLog.h>
#include <wtf/StackCheck.h>
#include <wtf/TriState.h>
#include <wtf/Vector.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC { namespace Yarr {
#include "RegExpJitTables.h"
class CharacterClassConstructor {
public:
CharacterClassConstructor(bool isCaseInsensitive, CompileMode compileMode)
: m_isCaseInsensitive(isCaseInsensitive)
, m_anyCharacter(false)
, m_mayContainStrings(false)
, m_invertedStrings(false)
, m_compileMode(compileMode)
, m_characterWidths(CharacterClassWidths::Unknown)
, m_canonicalMode(compileMode == CompileMode::Legacy ? CanonicalMode::UCS2 : CanonicalMode::Unicode)
{
}
void reset()
{
m_strings.clear();
m_matches8.clear();
m_ranges8.clear();
m_matches32.clear();
m_ranges32.clear();
m_setOp = CharacterClassSetOp::Default;
m_anyCharacter = false;
m_mayContainStrings = false;
m_invertedStrings = false;
m_characterWidths = CharacterClassWidths::Unknown;
}
void NODELETE combiningSetOp(CharacterClassSetOp setOp)
{
ASSERT(m_setOp == CharacterClassSetOp::Default || m_setOp == setOp);
m_setOp = setOp;
}
void append(const CharacterClass* other)
{
if (m_setOp != CharacterClassSetOp::Default) {
performSetOpWith(other);
return;
}
for (size_t i = 0; i < other->m_strings.size(); ++i)
m_strings.append(other->m_strings[i]);
for (size_t i = 0; i < other->m_matches8.size(); ++i)
addSorted(m_matches8, other->m_matches8[i]);
for (size_t i = 0; i < other->m_ranges8.size(); ++i)
addSortedRange(m_ranges8, other->m_ranges8[i].begin, other->m_ranges8[i].end);
for (size_t i = 0; i < other->m_matches32.size(); ++i)
addSorted(m_matches32, other->m_matches32[i]);
for (size_t i = 0; i < other->m_ranges32.size(); ++i)
addSortedRange(m_ranges32, other->m_ranges32[i].begin, other->m_ranges32[i].end);
m_mayContainStrings |= other->hasStrings();
}
void appendInverted(const CharacterClass* other)
{
auto addSortedInverted = [&](char32_t min, char32_t max,
const Vector<char32_t>& srcMatches, const Vector<CharacterRange>& srcRanges,
Vector<char32_t>& destMatches, Vector<CharacterRange>& destRanges) {
auto addSortedMatchOrRange = [&](char32_t lo, char32_t hiPlusOne) {
if (lo < hiPlusOne) {
if (lo + 1 == hiPlusOne)
addSorted(destMatches, lo);
else
addSortedRange(destRanges, lo, hiPlusOne - 1);
}
};
char32_t lo = min;
size_t matchesIndex = 0;
size_t rangesIndex = 0;
bool matchesRemaining = matchesIndex < srcMatches.size();
bool rangesRemaining = rangesIndex < srcRanges.size();
if (!matchesRemaining && !rangesRemaining) {
addSortedMatchOrRange(min, max + 1);
return;
}
while (matchesRemaining || rangesRemaining) {
char32_t hiPlusOne;
char32_t nextLo;
if (matchesRemaining
&& (!rangesRemaining || srcMatches[matchesIndex] < srcRanges[rangesIndex].begin)) {
hiPlusOne = srcMatches[matchesIndex];
nextLo = hiPlusOne + 1;
++matchesIndex;
matchesRemaining = matchesIndex < srcMatches.size();
} else {
hiPlusOne = srcRanges[rangesIndex].begin;
nextLo = srcRanges[rangesIndex].end + 1;
++rangesIndex;
rangesRemaining = rangesIndex < srcRanges.size();
}
addSortedMatchOrRange(lo, hiPlusOne);
lo = nextLo;
}
addSortedMatchOrRange(lo, max + 1);
};
if (other->hasStrings()) {
m_mayContainStrings = true;
m_invertedStrings = true;
}
addSortedInverted(0, 0xff, other->m_matches8, other->m_ranges8, m_matches8, m_ranges8);
addSortedInverted(0x100, UCHAR_MAX_VALUE, other->m_matches32, other->m_ranges32, m_matches32, m_ranges32);
}
void putChar(char32_t ch)
{
if (!isUnionSetOp())
return putCharNonUnion(ch);
if (!m_isCaseInsensitive) {
addSorted(ch);
return;
}
if (m_canonicalMode == CanonicalMode::UCS2 && isASCII(ch)) {
// Handle ASCII cases.
if (isASCIIAlpha(ch)) {
addSorted(m_matches8, toASCIIUpper(ch));
addSorted(m_matches8, toASCIILower(ch));
} else
addSorted(m_matches8, ch);
return;
}
// Add multiple matches, if necessary.
const CanonicalizationRange* info = canonicalRangeInfoFor(ch, m_canonicalMode);
if (info->type == CanonicalizeUnique)
addSorted(ch);
else
putUnicodeIgnoreCase(ch, info);
}
void putCharNonUnion(char32_t ch)
{
Vector<char32_t> matches8;
Vector<char32_t> matches32;
Vector<CharacterRange> emptyRanges;
if (m_setOp == CharacterClassSetOp::Intersection)
m_strings.clear();
auto addChar = [&] (char32_t ch) {
if (isLatin1(ch))
matches8.append(ch);
else
matches32.append(ch);
};
auto performOp = [&] () {
performSetOpWithMatches(matches8, emptyRanges, matches32, emptyRanges);
};
if (!m_isCaseInsensitive) {
addChar(ch);
performOp();
return;
}
if (m_canonicalMode == CanonicalMode::UCS2 && isASCII(ch)) {
// Handle ASCII cases.
if (isASCIIAlpha(ch)) {
addChar(toASCIIUpper(ch));
addChar(toASCIILower(ch));
} else
addChar(ch);
performOp();
return;
}
// Add multiple matches, if necessary.
const CanonicalizationRange* info = canonicalRangeInfoFor(ch, m_canonicalMode);
if (info->type == CanonicalizeUnique)
addChar(ch);
else {
if (info->type == CanonicalizeSet) {
for (auto* set = canonicalCharacterSetInfo(info->value, m_canonicalMode); (ch = *set); ++set)
addChar(ch);
} else {
char32_t canonicalChar = getCanonicalPair(info, ch);
addChar(std::min(ch, canonicalChar));
addChar(std::max(ch, canonicalChar));
}
}
performOp();
}
void putUnicodeIgnoreCase(char32_t ch, const CanonicalizationRange* info)
{
ASSERT(ch >= info->begin && ch <= info->end);
ASSERT(info->type != CanonicalizeUnique);
if (info->type == CanonicalizeSet) {
for (auto* set = canonicalCharacterSetInfo(info->value, m_canonicalMode); (ch = *set); ++set)
addSorted(ch);
} else {
addSorted(ch);
addSorted(getCanonicalPair(info, ch));
}
}
void putRange(char32_t lo, char32_t hi)
{
// The ASCII case-folding fast path is only valid in UCS2 canonical mode. In Unicode
// canonical mode, U+212A and U+017F canonicalize into ASCII 'k' and 's', so ASCII
// ranges must go through the canonicalization table below.
if (!m_isCaseInsensitive || m_canonicalMode == CanonicalMode::UCS2) {
// This is ASCII-case-folding fast path. So intentionally using isASCII (not isLatin1).
if (isASCII(lo)) {
char asciiLo = lo;
char asciiHi = std::min<char32_t>(hi, 0x7f);
addSortedRange(lo, asciiHi);
if (m_isCaseInsensitive) {
if ((asciiLo <= 'Z') && (asciiHi >= 'A'))
addSortedRange(std::max(asciiLo, 'A')+('a'-'A'), std::min(asciiHi, 'Z')+('a'-'A'));
if ((asciiLo <= 'z') && (asciiHi >= 'a'))
addSortedRange(std::max(asciiLo, 'a')+('A'-'a'), std::min(asciiHi, 'z')+('A'-'a'));
}
}
if (isASCII(hi))
return;
lo = std::max<char32_t>(lo, 0x80);
}
addSortedRange(lo, hi);
if (!m_isCaseInsensitive)
return;
const CanonicalizationRange* info = canonicalRangeInfoFor(lo, m_canonicalMode);
while (true) {
// Handle the range [lo .. end]
char32_t end = std::min<char32_t>(info->end, hi);
switch (info->type) {
case CanonicalizeUnique:
// Nothing to do - no canonical equivalents.
break;
case CanonicalizeSet: {
char16_t ch;
for (auto* set = canonicalCharacterSetInfo(info->value, m_canonicalMode); (ch = *set); ++set)
addSorted(ch);
break;
}
case CanonicalizeRangeLo:
addSortedRange(lo + info->value, end + info->value);
break;
case CanonicalizeRangeHi:
addSortedRange(lo - info->value, end - info->value);
break;
case CanonicalizeAlternatingAligned:
// Use addSortedRange since there is likely an abutting range to combine with.
if (lo & 1)
addSortedRange(lo - 1, lo - 1);
if (!(end & 1))
addSortedRange(end + 1, end + 1);
break;
case CanonicalizeAlternatingUnaligned:
// Use addSortedRange since there is likely an abutting range to combine with.
if (!(lo & 1))
addSortedRange(lo - 1, lo - 1);
if (end & 1)
addSortedRange(end + 1, end + 1);
break;
}
if (hi == end)
return;
++info;
lo = info->begin;
}
}
void atomClassStringDisjunction(Vector<Vector<char32_t>>& disjunctionStrings)
{
Vector<Vector<char32_t>> utf32Strings;
Vector<char32_t> matches8;
Vector<char32_t> matches32;
Vector<CharacterRange> emptyRanges;
sort(disjunctionStrings);
auto addCh = [&](char32_t ch) {
if (isLatin1(ch))
matches8.append(ch);
else
matches32.append(ch);
};
for (auto string : disjunctionStrings) {
if (string.size() == 1) {
char32_t ch = string[0];
if (!m_isCaseInsensitive) {
addCh(ch);
continue;
}
// Add multiple matches, if necessary.
const CanonicalizationRange* info = canonicalRangeInfoFor(ch, m_canonicalMode);
if (info->type == CanonicalizeUnique)
addCh(ch);
else {
if (info->type == CanonicalizeSet) {
for (auto* set = canonicalCharacterSetInfo(info->value, m_canonicalMode); (ch = *set); ++set)
addCh(ch);
} else {
addCh(ch);
addCh(getCanonicalPair(info, ch));
}
}
continue;
}
utf32Strings.append(string);
}
performSetOpWithStrings(utf32Strings);
performSetOpWithMatches(matches8, emptyRanges, matches32, emptyRanges);
}
void invertMatches()
{
if (!m_strings.isEmpty())
m_invertedStrings = true;
latin1Invert();
nonLatin1Invert();
}
void performSetOpWith(CharacterClassConstructor* rhs)
{
performSetOpWithStrings(rhs->m_strings);
performSetOpWithMatches(rhs->m_matches8, rhs->m_ranges8, rhs->m_matches32, rhs->m_ranges32);
}
void performSetOpWith(const CharacterClass* rhs)
{
performSetOpWithStrings(rhs->m_strings);
performSetOpWithMatches(rhs->m_matches8, rhs->m_ranges8, rhs->m_matches32, rhs->m_ranges32);
}
void performSetOpWithStrings(const Vector<Vector<char32_t>>& utf32Strings)
{
if (m_compileMode != CompileMode::UnicodeSets)
return;
switch (m_setOp) {
case CharacterClassSetOp::Default:
case CharacterClassSetOp::Union:
unionStrings(utf32Strings);
break;
case CharacterClassSetOp::Intersection:
intersectionStrings(utf32Strings);
break;
case CharacterClassSetOp::Subtraction:
subtractionStrings(utf32Strings);
break;
}
}
void performSetOpWithMatches(const Vector<char32_t>& rhsMatches8, const Vector<CharacterRange>& rhsRanges8, const Vector<char32_t>& rhsMatches32, const Vector<CharacterRange>& rhsRanges32)
{
if (m_compileMode != CompileMode::UnicodeSets)
return;
latin1Op(rhsMatches8, rhsRanges8);
// Sort the incoming non-Latin-1 matches, since Unicode case folding canonicalization may cause
// characters to be added to rhsMatches32 out of code point order.
Vector<char32_t> rhsSortedMatches32(rhsMatches32);
std::ranges::sort(rhsSortedMatches32);
nonLatin1OpSorted(rhsSortedMatches32, rhsRanges32);
}
bool NODELETE hasInvertedStrings()
{
return m_invertedStrings;
}
static ALWAYS_INLINE int NODELETE compareUTF32Strings(const Vector<char32_t>& a, const Vector<char32_t>& b)
{
// Longer strings before shorter.
if (a.size() > b.size())
return -1;
if (a.size() < b.size())
return 1;
// Lexically sort for same length strings.
for (unsigned i = 0; i < a.size(); ++i) {
if (a[i] != b[i])
return (a[i] < b[i]) ? -1 : 1;
}
return 0;
}
static void sort(Vector<Vector<char32_t>>& utf32Strings)
{
std::ranges::sort(utf32Strings, [](const auto& a, const auto& b) {
return compareUTF32Strings(a, b) < 0;
});
}
std::unique_ptr<CharacterClass> charClass()
{
coalesceTables();
if (!m_strings.isEmpty())
sort(m_strings);
auto characterClass = makeUnique<CharacterClass>();
characterClass->m_strings.swap(m_strings);
characterClass->m_matches8.swap(m_matches8);
characterClass->m_ranges8.swap(m_ranges8);
characterClass->m_matches32.swap(m_matches32);
characterClass->m_ranges32.swap(m_ranges32);
characterClass->m_anyCharacter = anyCharacter();
characterClass->m_characterWidths = characterWidths();
buildLatin1TableIfBeneficial(*characterClass);
m_anyCharacter = false;
m_characterWidths = CharacterClassWidths::Unknown;
return characterClass;
}
void NODELETE setIsCaseInsensitive(bool ignoreCase)
{
m_isCaseInsensitive = ignoreCase;
}
static void buildLatin1TableIfBeneficial(CharacterClass& characterClass)
{
if (!characterClass.m_strings.isEmpty() || characterClass.m_anyCharacter || characterClass.m_table)
return;
const auto& matches = characterClass.m_matches8;
const auto& ranges = characterClass.m_ranges8;
// A single range is already one subtract + one compare in the JIT, so a table would not help.
unsigned entryCount = matches.size() + ranges.size();
if (entryCount < 2)
return;
constexpr char32_t maxLatin1 = CharacterClass::latin1TableSize - 1;
char32_t low = !ranges.isEmpty() ? ranges.first().begin : matches.first();
char32_t high = !ranges.isEmpty() ? ranges.last().end : matches.last();
if (!matches.isEmpty()) {
low = std::min<char32_t>(low, matches.first());
high = std::max<char32_t>(high, matches.last());
}
ASSERT_UNUSED(maxLatin1, low <= maxLatin1 && high <= maxLatin1);
constexpr char32_t bitTestFootprint = 64;
if (high - low < bitTestFootprint)
return;
auto table = makeUnique<CharacterClass::ByteTable>();
for (auto match : matches) {
ASSERT(match <= maxLatin1);
table->data[match] = 1;
}
for (auto range : ranges) {
ASSERT(range.end <= maxLatin1);
for (char32_t ch = range.begin; ch <= range.end; ++ch)
table->data[ch] = 1;
}
characterClass.m_latin1Table = WTF::move(table);
}
private:
void addSorted(char32_t ch)
{
addSorted(isLatin1(ch) ? m_matches8 : m_matches32, ch);
}
void addSorted(Vector<char32_t>& matches, char32_t ch)
{
unsigned pos = 0;
unsigned range = matches.size();
m_characterWidths |= (U_IS_BMP(ch) ? CharacterClassWidths::HasBMPChars : CharacterClassWidths::HasNonBMPChars);
// binary chop, find position to insert char.
while (range) {
unsigned index = range >> 1;
int val = matches[pos+index] - ch;
if (!val)
return;
else if (val > 0) {
if (val == 1) {
char32_t lo = ch;
char32_t hi = ch + 1;
matches.removeAt(pos + index);
if (pos + index > 0 && matches[pos + index - 1] == ch - 1) {
lo = ch - 1;
matches.removeAt(pos + index - 1);
}
addSortedRange(isLatin1(ch) ? m_ranges8 : m_ranges32, lo, hi);
return;
}
range = index;
} else {
if (val == -1) {
char32_t lo = ch - 1;
char32_t hi = ch;
matches.removeAt(pos + index);
if (pos + index + 1 < matches.size() && matches[pos + index + 1] == ch + 1) {
hi = ch + 1;
matches.removeAt(pos + index + 1);
}
addSortedRange(isLatin1(ch) ? m_ranges8 : m_ranges32, lo, hi);
return;
}
pos += (index+1);
range -= (index+1);
}
}
if (pos == matches.size())
matches.append(ch);
else
matches.insert(pos, ch);
}
void addSortedRange(Vector<CharacterRange>& ranges, char32_t lo, char32_t hi)
{
size_t end = ranges.size();
if (U_IS_BMP(lo))
m_characterWidths |= CharacterClassWidths::HasBMPChars;
if (!U_IS_BMP(hi))
m_characterWidths |= CharacterClassWidths::HasNonBMPChars;
// Simple linear scan - I doubt there are that many ranges anyway...
// feel free to fix this with something faster (eg binary chop).
for (size_t i = 0; i < end; ++i) {
// does the new range fall before the current position in the array
if (hi < ranges[i].begin) {
// Concatenate appending ranges.
if (hi == (ranges[i].begin - 1)) {
ranges[i].begin = lo;
return;
}
ranges.insert(i, CharacterRange(lo, hi));
return;
}
// Okay, since we didn't hit the last case, the end of the new range is definitely at or after the begining
// If the new range start at or before the end of the last range, then the overlap (if it starts one after the
// end of the last range they concatenate, which is just as good.
if (lo <= (ranges[i].end + 1)) {
// found an intersect! we'll replace this entry in the array.
ranges[i].begin = std::min(ranges[i].begin, lo);
ranges[i].end = std::max(ranges[i].end, hi);
mergeRangesFrom(ranges, i);
return;
}
}
// CharacterRange comes after all existing ranges.
ranges.append(CharacterRange(lo, hi));
}
void addSortedRange(char32_t lo, char32_t hi)
{
if (lo == hi) {
addSorted(lo);
return;
}
if (isLatin1(lo)) {
auto latin1Hi = std::min<char32_t>(hi, 0xff);
if (lo == latin1Hi)
addSorted(m_matches8, lo);
else
addSortedRange(m_ranges8, lo, latin1Hi);
if (isLatin1(hi))
return;
lo = 0x100;
if (lo == hi) {
addSorted(m_matches32, hi);
return;
}
}
addSortedRange(m_ranges32, lo, hi);
}
void mergeRangesFrom(Vector<CharacterRange>& ranges, size_t index)
{
unsigned next = index + 1;
// each iteration of the loop we will either remove something from the list, or break out of the loop.
while (next < ranges.size()) {
if (ranges[next].begin <= (ranges[index].end + 1)) {
// the next entry now overlaps / concatenates with this one.
ranges[index].end = std::max(ranges[index].end, ranges[next].end);
ranges.removeAt(next);
} else
break;
}
}
void unionStrings(const Vector<Vector<char32_t>>& rhsStrings)
{
// result should include strings in either the LHS or RHS
Vector<Vector<char32_t>> result;
size_t lhsIndex = 0;
size_t rhsIndex = 0;
while (lhsIndex < m_strings.size() && rhsIndex < rhsStrings.size()) {
auto lhsString = m_strings[lhsIndex];
auto rhsString = rhsStrings[rhsIndex];
auto strCompare = compareUTF32Strings(lhsString, rhsString);
if (strCompare <= 0) {
result.append(lhsString);
lhsIndex++;
if (!strCompare)
rhsIndex++;
} else {
result.append(rhsString);
rhsIndex++;
}
}
// One of LHS or RHS has been exhausted, add the remaining strings.
while (lhsIndex < m_strings.size())
result.append(m_strings[lhsIndex++]);
while (rhsIndex < rhsStrings.size())
result.append(rhsStrings[rhsIndex++]);
m_strings.swap(result);
m_mayContainStrings = !m_strings.isEmpty();
}
void intersectionStrings(const Vector<Vector<char32_t>>& rhsStrings)
{
// result should include strings that are in both the LHS and RHS.
Vector<Vector<char32_t>> result;
size_t lhsIndex = 0;
size_t rhsIndex = 0;
while (lhsIndex < m_strings.size() && rhsIndex < rhsStrings.size()) {
auto lhsString = m_strings[lhsIndex];
auto rhsString = rhsStrings[rhsIndex];
auto strCompare = compareUTF32Strings(lhsString, rhsString);
if (!strCompare) {
result.append(lhsString);
lhsIndex++;
rhsIndex++;
} else if (strCompare < 0)
lhsIndex++;
else
rhsIndex++;
}
m_strings.swap(result);
m_mayContainStrings = !m_strings.isEmpty();
}
void subtractionStrings(const Vector<Vector<char32_t>>& rhsStrings)
{
// result should include strings in LHS that are not in RHS.
Vector<Vector<char32_t>> result;
size_t lhsIndex = 0;
size_t rhsIndex = 0;
while (lhsIndex < m_strings.size() && rhsIndex < rhsStrings.size()) {
auto lhsString = m_strings[lhsIndex];
auto rhsString = rhsStrings[rhsIndex];
auto strCompare = compareUTF32Strings(lhsString, rhsString);
if (!strCompare) {
lhsIndex++;
rhsIndex++;
} else if (strCompare < 0) {
result.append(lhsString);
lhsIndex++;
} else
rhsIndex++;
}
// Add any remaining LHS strings.
while (lhsIndex < m_strings.size())
result.append(m_strings[lhsIndex++]);
m_strings.swap(result);
m_mayContainStrings = !m_strings.isEmpty();
}
void latin1Op(const Vector<char32_t>& rhsMatches, const Vector<CharacterRange>& rhsRanges)
{
Vector<char32_t> resultMatches;
Vector<CharacterRange> resultRanges;
WTF::BitSet<0x100> lhsLatin1BitSet;
WTF::BitSet<0x100> rhsLatin1BitSet;
for (auto match : m_matches8)
lhsLatin1BitSet.set(match);
for (auto range : m_ranges8) {
for (char32_t ch = range.begin; ch <= range.end; ch++)
lhsLatin1BitSet.set(ch);
}
for (auto match : rhsMatches)
rhsLatin1BitSet.set(match);
for (auto range : rhsRanges) {
for (char32_t ch = range.begin; ch <= range.end; ch++)
rhsLatin1BitSet.set(ch);
}
switch (m_setOp) {
case CharacterClassSetOp::Default:
case CharacterClassSetOp::Union:
lhsLatin1BitSet.merge(rhsLatin1BitSet);
break;
case CharacterClassSetOp::Intersection:
lhsLatin1BitSet.filter(rhsLatin1BitSet);
break;
case CharacterClassSetOp::Subtraction:
lhsLatin1BitSet.exclude(rhsLatin1BitSet);
break;
}
bool firstCharUnset = true;
char32_t lo = 0;
char32_t hi = 0;
auto addCharToResults = [&]() {
if (lo == hi)
resultMatches.append(lo);
else
resultRanges.append(CharacterRange(lo, hi));
};
for (auto setVal : lhsLatin1BitSet) {
char32_t ch = setVal;
if (firstCharUnset) {
lo = hi = ch;
firstCharUnset = false;
} else {
if (ch == hi + 1)
hi = ch;
else {
addCharToResults();
lo = hi = ch;
}
}
}
if (!firstCharUnset)
addCharToResults();
m_matches8.swap(resultMatches);
m_ranges8.swap(resultRanges);
}
void latin1Invert()
{
Vector<char32_t> resultMatches;
Vector<CharacterRange> resultRanges;
WTF::BitSet<0x100> latin1BitSet;
for (auto match : m_matches8)
latin1BitSet.set(match);
for (auto range : m_ranges8) {
for (char32_t ch = range.begin; ch <= range.end; ch++)
latin1BitSet.set(ch);
}
latin1BitSet.invert();
bool firstCharUnset = true;
char32_t lo = 0;
char32_t hi = 0;
auto addCharToResults = [&]() {
if (lo == hi)
resultMatches.append(lo);
else
resultRanges.append(CharacterRange(lo, hi));
};
for (auto setVal : latin1BitSet) {
char32_t ch = setVal;
if (firstCharUnset) {
lo = hi = ch;
firstCharUnset = false;
} else {
if (ch == hi + 1)
hi = ch;
else {
addCharToResults();
lo = hi = ch;
}
}
}
if (!firstCharUnset)
addCharToResults();
m_matches8.swap(resultMatches);
m_ranges8.swap(resultRanges);
}
void nonLatin1OpSorted(const Vector<char32_t>& rhsMatches32, const Vector<CharacterRange>& rhsRanges32)
{
Vector<char32_t> resultMatches;
Vector<CharacterRange> resultRanges;
constexpr size_t chunkSize = 2048;
WTF::BitSet<chunkSize> lhsChunkBitSet;
WTF::BitSet<chunkSize> rhsChunkBitSet;
char32_t chunkLo = INT_MAX, chunkHi;
size_t lhsMatchIndex = 0;
size_t lhsRangeIndex = 0;
size_t rhsMatchIndex = 0;
size_t rhsRangeIndex = 0;
if (!m_matches32.isEmpty())
chunkLo = std::min(chunkLo, m_matches32[0]);
if (!m_ranges32.isEmpty())
chunkLo = std::min(chunkLo, m_ranges32[0].begin);
if (!rhsMatches32.isEmpty())
chunkLo = std::min(chunkLo, rhsMatches32[0]);
if (!rhsRanges32.isEmpty())
chunkLo = std::min(chunkLo, rhsRanges32[0].begin);
// If both the LHS and RHS are empty, bail out.
if (chunkLo == INT_MAX)
return;
while (lhsMatchIndex < m_matches32.size() || lhsRangeIndex < m_ranges32.size() || rhsMatchIndex < rhsMatches32.size() || rhsRangeIndex < rhsRanges32.size()) {
if (rhsMatchIndex >= rhsMatches32.size() && rhsRangeIndex > rhsRanges32.size() && m_setOp == CharacterClassSetOp::Intersection) {
// RHS is exhausted, we can short cut from here. Can't intersect anything more so bail out.
break;
}
chunkHi = chunkLo + chunkSize - 1;
for (; lhsMatchIndex < m_matches32.size(); ++lhsMatchIndex) {
char32_t ch = m_matches32[lhsMatchIndex];
if (ch > chunkHi)
break;
ASSERT(ch >= chunkLo);
lhsChunkBitSet.set(ch - chunkLo);
}
for (; lhsRangeIndex < m_ranges32.size(); ++lhsRangeIndex) {
auto range = m_ranges32[lhsRangeIndex];
if (range.begin > chunkHi)
break;
auto begin = std::max(chunkLo, range.begin);
auto end = std::min(range.end, chunkHi);
for (char32_t ch = begin; ch <= end; ch++) {
ASSERT(ch >= chunkLo);
lhsChunkBitSet.set(ch - chunkLo);
}
if (range.end > chunkHi)
break;
}
for (; rhsMatchIndex < rhsMatches32.size(); ++rhsMatchIndex) {
char32_t ch = rhsMatches32[rhsMatchIndex];
if (ch > chunkHi)
break;
ASSERT(ch >= chunkLo);
rhsChunkBitSet.set(ch - chunkLo);
}
for (; rhsRangeIndex < rhsRanges32.size(); ++rhsRangeIndex) {
auto range = rhsRanges32[rhsRangeIndex];
if (range.begin > chunkHi)
break;
auto begin = std::max(chunkLo, range.begin);
auto end = std::min(range.end, chunkHi);
for (char32_t ch = begin; ch <= end; ch++) {
ASSERT(ch >= chunkLo);
rhsChunkBitSet.set(ch - chunkLo);
}
if (range.end > chunkHi)
break;
}
switch (m_setOp) {
case CharacterClassSetOp::Default:
case CharacterClassSetOp::Union:
lhsChunkBitSet.merge(rhsChunkBitSet);
break;
case CharacterClassSetOp::Intersection:
lhsChunkBitSet.filter(rhsChunkBitSet);
break;
case CharacterClassSetOp::Subtraction:
lhsChunkBitSet.exclude(rhsChunkBitSet);
break;
}
bool firstCharUnset = true;
char32_t lo = 0;
char32_t hi = 0;
auto addCharToResults = [&]() {
if (lo == hi)
resultMatches.append(lo);
else {
// Coalesce the prior range with the new (lo, hi) range if they are adjacent.
if (resultRanges.size() > 0) {
auto lastIndex = resultRanges.size() - 1;
if (resultRanges[lastIndex].end + 1 == lo) {
resultRanges[lastIndex].end = hi;
return;
}
}