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/*
* Copyright (C) 2009, 2013-2017 Apple Inc. All rights reserved.
* Copyright (C) 2010 Peter Varga (pvarga@inf.u-szeged.hu), University of Szeged
*
* 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.
*/
#pragma once
#include "YarrErrorCode.h"
#include "YarrFlags.h"
#include "YarrUnicodeProperties.h"
#include <wtf/CheckedArithmetic.h>
#include <wtf/HashMap.h>
#include <wtf/OptionSet.h>
#include <wtf/PrintStream.h>
#include <wtf/Vector.h>
#include <wtf/text/StringHash.h>
namespace JSC { namespace Yarr {
struct YarrPattern;
struct PatternDisjunction;
struct CharacterRange {
UChar32 begin { 0 };
UChar32 end { 0x10ffff };
CharacterRange(UChar32 begin, UChar32 end)
: begin(begin)
, end(end)
{
}
};
enum struct CharacterClassWidths : unsigned char {
Unknown = 0x0,
HasBMPChars = 0x1,
HasNonBMPChars = 0x2,
HasBothBMPAndNonBMP = HasBMPChars | HasNonBMPChars
};
inline CharacterClassWidths operator|(CharacterClassWidths lhs, CharacterClassWidths rhs)
{
return static_cast<CharacterClassWidths>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs));
}
inline bool operator&(CharacterClassWidths lhs, CharacterClassWidths rhs)
{
return static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs);
}
inline CharacterClassWidths& operator|=(CharacterClassWidths& lhs, CharacterClassWidths rhs)
{
lhs = lhs | rhs;
return lhs;
}
struct CharacterClass {
WTF_MAKE_FAST_ALLOCATED;
public:
// All CharacterClass instances have to have the full set of matches and ranges,
// they may have an optional m_table for faster lookups (which must match the
// specified matches and ranges)
CharacterClass()
: m_table(0)
, m_characterWidths(CharacterClassWidths::Unknown)
, m_anyCharacter(false)
{
}
CharacterClass(const char* table, bool inverted)
: m_table(table)
, m_characterWidths(CharacterClassWidths::Unknown)
, m_tableInverted(inverted)
, m_anyCharacter(false)
{
}
CharacterClass(std::initializer_list<UChar32> matches, std::initializer_list<CharacterRange> ranges, std::initializer_list<UChar32> matchesUnicode, std::initializer_list<CharacterRange> rangesUnicode, CharacterClassWidths widths)
: m_matches(matches)
, m_ranges(ranges)
, m_matchesUnicode(matchesUnicode)
, m_rangesUnicode(rangesUnicode)
, m_table(0)
, m_characterWidths(widths)
, m_tableInverted(false)
, m_anyCharacter(false)
{
}
bool hasNonBMPCharacters() { return m_characterWidths & CharacterClassWidths::HasNonBMPChars; }
bool hasOneCharacterSize() { return m_characterWidths == CharacterClassWidths::HasBMPChars || m_characterWidths == CharacterClassWidths::HasNonBMPChars; }
bool hasOnlyNonBMPCharacters() { return m_characterWidths == CharacterClassWidths::HasNonBMPChars; }
Vector<UChar32> m_matches;
Vector<CharacterRange> m_ranges;
Vector<UChar32> m_matchesUnicode;
Vector<CharacterRange> m_rangesUnicode;
const char* m_table;
CharacterClassWidths m_characterWidths;
bool m_tableInverted : 1;
bool m_anyCharacter : 1;
};
enum QuantifierType : uint8_t {
QuantifierFixedCount,
QuantifierGreedy,
QuantifierNonGreedy,
};
struct PatternTerm {
enum Type : uint8_t {
TypeAssertionBOL,
TypeAssertionEOL,
TypeAssertionWordBoundary,
TypePatternCharacter,
TypeCharacterClass,
TypeBackReference,
TypeForwardReference,
TypeParenthesesSubpattern,
TypeParentheticalAssertion,
TypeDotStarEnclosure,
} type;
bool m_capture :1;
bool m_invert :1;
QuantifierType quantityType;
Checked<unsigned> quantityMinCount;
Checked<unsigned> quantityMaxCount;
union {
UChar32 patternCharacter;
CharacterClass* characterClass;
unsigned backReferenceSubpatternId;
struct {
PatternDisjunction* disjunction;
unsigned subpatternId;
unsigned lastSubpatternId;
bool isCopy;
bool isTerminal;
} parentheses;
struct {
bool bolAnchor : 1;
bool eolAnchor : 1;
} anchors;
};
unsigned inputPosition;
unsigned frameLocation;
PatternTerm(UChar32 ch)
: type(PatternTerm::TypePatternCharacter)
, m_capture(false)
, m_invert(false)
{
patternCharacter = ch;
quantityType = QuantifierFixedCount;
quantityMinCount = quantityMaxCount = 1;
}
PatternTerm(CharacterClass* charClass, bool invert)
: type(PatternTerm::TypeCharacterClass)
, m_capture(false)
, m_invert(invert)
{
characterClass = charClass;
quantityType = QuantifierFixedCount;
quantityMinCount = quantityMaxCount = 1;
}
PatternTerm(Type type, unsigned subpatternId, PatternDisjunction* disjunction, bool capture = false, bool invert = false)
: type(type)
, m_capture(capture)
, m_invert(invert)
{
parentheses.disjunction = disjunction;
parentheses.subpatternId = subpatternId;
parentheses.isCopy = false;
parentheses.isTerminal = false;
quantityType = QuantifierFixedCount;
quantityMinCount = quantityMaxCount = 1;
}
PatternTerm(Type type, bool invert = false)
: type(type)
, m_capture(false)
, m_invert(invert)
{
quantityType = QuantifierFixedCount;
quantityMinCount = quantityMaxCount = 1;
}
PatternTerm(unsigned spatternId)
: type(TypeBackReference)
, m_capture(false)
, m_invert(false)
{
backReferenceSubpatternId = spatternId;
quantityType = QuantifierFixedCount;
quantityMinCount = quantityMaxCount = 1;
}
PatternTerm(bool bolAnchor, bool eolAnchor)
: type(TypeDotStarEnclosure)
, m_capture(false)
, m_invert(false)
{
anchors.bolAnchor = bolAnchor;
anchors.eolAnchor = eolAnchor;
quantityType = QuantifierFixedCount;
quantityMinCount = quantityMaxCount = 1;
}
static PatternTerm ForwardReference()
{
return PatternTerm(TypeForwardReference);
}
static PatternTerm BOL()
{
return PatternTerm(TypeAssertionBOL);
}
static PatternTerm EOL()
{
return PatternTerm(TypeAssertionEOL);
}
static PatternTerm WordBoundary(bool invert)
{
return PatternTerm(TypeAssertionWordBoundary, invert);
}
bool invert() const
{
return m_invert;
}
bool capture()
{
return m_capture;
}
bool isFixedWidthCharacterClass() const
{
return type == TypeCharacterClass && characterClass->hasOneCharacterSize() && !invert();
}
bool containsAnyCaptures()
{
ASSERT(this->type == TypeParenthesesSubpattern);
return parentheses.lastSubpatternId >= parentheses.subpatternId;
}
void quantify(unsigned count, QuantifierType type)
{
quantityMinCount = 0;
quantityMaxCount = count;
quantityType = type;
}
void quantify(unsigned minCount, unsigned maxCount, QuantifierType type)
{
// Currently only Parentheses can specify a non-zero min with a different max.
ASSERT(this->type == TypeParenthesesSubpattern || !minCount || minCount == maxCount);
ASSERT(minCount <= maxCount);
quantityMinCount = minCount;
quantityMaxCount = maxCount;
quantityType = type;
}
void dumpQuantifier(PrintStream&);
void dump(PrintStream&, YarrPattern*, unsigned);
};
struct PatternAlternative {
WTF_MAKE_FAST_ALLOCATED;
public:
PatternAlternative(PatternDisjunction* disjunction)
: m_parent(disjunction)
, m_onceThrough(false)
, m_hasFixedSize(false)
, m_startsWithBOL(false)
, m_containsBOL(false)
{
}
PatternTerm& lastTerm()
{
ASSERT(m_terms.size());
return m_terms[m_terms.size() - 1];
}
void removeLastTerm()
{
ASSERT(m_terms.size());
m_terms.shrink(m_terms.size() - 1);
}
void setOnceThrough()
{
m_onceThrough = true;
}
bool onceThrough()
{
return m_onceThrough;
}
void dump(PrintStream&, YarrPattern*, unsigned);
Vector<PatternTerm> m_terms;
PatternDisjunction* m_parent;
unsigned m_minimumSize;
bool m_onceThrough : 1;
bool m_hasFixedSize : 1;
bool m_startsWithBOL : 1;
bool m_containsBOL : 1;
};
struct PatternDisjunction {
WTF_MAKE_FAST_ALLOCATED;
public:
PatternDisjunction(PatternAlternative* parent = 0)
: m_parent(parent)
, m_hasFixedSize(false)
{
}
PatternAlternative* addNewAlternative()
{
m_alternatives.append(makeUnique<PatternAlternative>(this));
return static_cast<PatternAlternative*>(m_alternatives.last().get());
}
void dump(PrintStream&, YarrPattern*, unsigned);
Vector<std::unique_ptr<PatternAlternative>> m_alternatives;
PatternAlternative* m_parent;
unsigned m_minimumSize;
unsigned m_callFrameSize;
bool m_hasFixedSize;
};
// You probably don't want to be calling these functions directly
// (please to be calling newlineCharacterClass() et al on your
// friendly neighborhood YarrPattern instance to get nicely
// cached copies).
std::unique_ptr<CharacterClass> anycharCreate();
std::unique_ptr<CharacterClass> newlineCreate();
std::unique_ptr<CharacterClass> digitsCreate();
std::unique_ptr<CharacterClass> spacesCreate();
std::unique_ptr<CharacterClass> wordcharCreate();
std::unique_ptr<CharacterClass> wordUnicodeIgnoreCaseCharCreate();
std::unique_ptr<CharacterClass> nondigitsCreate();
std::unique_ptr<CharacterClass> nonspacesCreate();
std::unique_ptr<CharacterClass> nonwordcharCreate();
std::unique_ptr<CharacterClass> nonwordUnicodeIgnoreCaseCharCreate();
struct TermChain {
TermChain(PatternTerm term)
: term(term)
{}
PatternTerm term;
Vector<TermChain> hotTerms;
};
struct YarrPattern {
JS_EXPORT_PRIVATE YarrPattern(const String& pattern, OptionSet<Flags>, ErrorCode&, void* stackLimit = nullptr);
void resetForReparsing()
{
m_numSubpatterns = 0;
m_maxBackReference = 0;
m_initialStartValueFrameLocation = 0;
m_containsBackreferences = false;
m_containsBOL = false;
m_containsUnsignedLengthPattern = false;
m_hasCopiedParenSubexpressions = false;
m_saveInitialStartValue = false;
anycharCached = nullptr;
newlineCached = nullptr;
digitsCached = nullptr;
spacesCached = nullptr;
wordcharCached = nullptr;
wordUnicodeIgnoreCaseCharCached = nullptr;
nondigitsCached = nullptr;
nonspacesCached = nullptr;
nonwordcharCached = nullptr;
nonwordUnicodeIgnoreCasecharCached = nullptr;
unicodePropertiesCached.clear();
m_disjunctions.clear();
m_userCharacterClasses.clear();
m_captureGroupNames.shrink(0);
m_namedForwardReferences.shrink(0);
}
bool containsIllegalBackReference()
{
return m_maxBackReference > m_numSubpatterns;
}
bool containsIllegalNamedForwardReferences()
{
if (m_namedForwardReferences.isEmpty())
return false;
for (auto& entry : m_namedForwardReferences) {
if (!m_captureGroupNames.contains(entry))
return true;
}
return false;
}
bool containsUnsignedLengthPattern()
{
return m_containsUnsignedLengthPattern;
}
CharacterClass* anyCharacterClass()
{
if (!anycharCached) {
m_userCharacterClasses.append(anycharCreate());
anycharCached = m_userCharacterClasses.last().get();
}
return anycharCached;
}
CharacterClass* newlineCharacterClass()
{
if (!newlineCached) {
m_userCharacterClasses.append(newlineCreate());
newlineCached = m_userCharacterClasses.last().get();
}
return newlineCached;
}
CharacterClass* digitsCharacterClass()
{
if (!digitsCached) {
m_userCharacterClasses.append(digitsCreate());
digitsCached = m_userCharacterClasses.last().get();
}
return digitsCached;
}
CharacterClass* spacesCharacterClass()
{
if (!spacesCached) {
m_userCharacterClasses.append(spacesCreate());
spacesCached = m_userCharacterClasses.last().get();
}
return spacesCached;
}
CharacterClass* wordcharCharacterClass()
{
if (!wordcharCached) {
m_userCharacterClasses.append(wordcharCreate());
wordcharCached = m_userCharacterClasses.last().get();
}
return wordcharCached;
}
CharacterClass* wordUnicodeIgnoreCaseCharCharacterClass()
{
if (!wordUnicodeIgnoreCaseCharCached) {
m_userCharacterClasses.append(wordUnicodeIgnoreCaseCharCreate());
wordUnicodeIgnoreCaseCharCached = m_userCharacterClasses.last().get();
}
return wordUnicodeIgnoreCaseCharCached;
}
CharacterClass* nondigitsCharacterClass()
{
if (!nondigitsCached) {
m_userCharacterClasses.append(nondigitsCreate());
nondigitsCached = m_userCharacterClasses.last().get();
}
return nondigitsCached;
}
CharacterClass* nonspacesCharacterClass()
{
if (!nonspacesCached) {
m_userCharacterClasses.append(nonspacesCreate());
nonspacesCached = m_userCharacterClasses.last().get();
}
return nonspacesCached;
}
CharacterClass* nonwordcharCharacterClass()
{
if (!nonwordcharCached) {
m_userCharacterClasses.append(nonwordcharCreate());
nonwordcharCached = m_userCharacterClasses.last().get();
}
return nonwordcharCached;
}
CharacterClass* nonwordUnicodeIgnoreCaseCharCharacterClass()
{
if (!nonwordUnicodeIgnoreCasecharCached) {
m_userCharacterClasses.append(nonwordUnicodeIgnoreCaseCharCreate());
nonwordUnicodeIgnoreCasecharCached = m_userCharacterClasses.last().get();
}
return nonwordUnicodeIgnoreCasecharCached;
}
CharacterClass* unicodeCharacterClassFor(BuiltInCharacterClassID unicodeClassID)
{
ASSERT(unicodeClassID >= BuiltInCharacterClassID::BaseUnicodePropertyID);
unsigned classID = static_cast<unsigned>(unicodeClassID);
if (unicodePropertiesCached.find(classID) == unicodePropertiesCached.end()) {
m_userCharacterClasses.append(createUnicodeCharacterClassFor(unicodeClassID));
CharacterClass* result = m_userCharacterClasses.last().get();
unicodePropertiesCached.add(classID, result);
return result;
}
return unicodePropertiesCached.get(classID);
}
void dumpPatternString(PrintStream& out, const String& patternString);
void dumpPattern(const String& pattern);
void dumpPattern(PrintStream& out, const String& pattern);
bool global() const { return m_flags.contains(Flags::Global); }
bool ignoreCase() const { return m_flags.contains(Flags::IgnoreCase); }
bool multiline() const { return m_flags.contains(Flags::Multiline); }
bool sticky() const { return m_flags.contains(Flags::Sticky); }
bool unicode() const { return m_flags.contains(Flags::Unicode); }
bool dotAll() const { return m_flags.contains(Flags::DotAll); }
bool m_containsBackreferences : 1;
bool m_containsBOL : 1;
bool m_containsUnsignedLengthPattern : 1;
bool m_hasCopiedParenSubexpressions : 1;
bool m_saveInitialStartValue : 1;
OptionSet<Flags> m_flags;
unsigned m_numSubpatterns { 0 };
unsigned m_maxBackReference { 0 };
unsigned m_initialStartValueFrameLocation { 0 };
PatternDisjunction* m_body;
Vector<std::unique_ptr<PatternDisjunction>, 4> m_disjunctions;
Vector<std::unique_ptr<CharacterClass>> m_userCharacterClasses;
Vector<String> m_captureGroupNames;
Vector<String> m_namedForwardReferences;
HashMap<String, unsigned> m_namedGroupToParenIndex;
private:
ErrorCode compile(const String& patternString, void* stackLimit);
CharacterClass* anycharCached { nullptr };
CharacterClass* newlineCached { nullptr };
CharacterClass* digitsCached { nullptr };
CharacterClass* spacesCached { nullptr };
CharacterClass* wordcharCached { nullptr };
CharacterClass* wordUnicodeIgnoreCaseCharCached { nullptr };
CharacterClass* nondigitsCached { nullptr };
CharacterClass* nonspacesCached { nullptr };
CharacterClass* nonwordcharCached { nullptr };
CharacterClass* nonwordUnicodeIgnoreCasecharCached { nullptr };
HashMap<unsigned, CharacterClass*> unicodePropertiesCached;
};
void indentForNestingLevel(PrintStream&, unsigned);
void dumpUChar32(PrintStream&, UChar32);
void dumpCharacterClass(PrintStream&, YarrPattern*, CharacterClass*);
struct BackTrackInfoPatternCharacter {
uintptr_t begin; // Only needed for unicode patterns
uintptr_t matchAmount;
static unsigned beginIndex() { return offsetof(BackTrackInfoPatternCharacter, begin) / sizeof(uintptr_t); }
static unsigned matchAmountIndex() { return offsetof(BackTrackInfoPatternCharacter, matchAmount) / sizeof(uintptr_t); }
};
struct BackTrackInfoCharacterClass {
uintptr_t begin; // Only needed for unicode patterns
uintptr_t matchAmount;
static unsigned beginIndex() { return offsetof(BackTrackInfoCharacterClass, begin) / sizeof(uintptr_t); }
static unsigned matchAmountIndex() { return offsetof(BackTrackInfoCharacterClass, matchAmount) / sizeof(uintptr_t); }
};
struct BackTrackInfoBackReference {
uintptr_t begin; // Not really needed for greedy quantifiers.
uintptr_t matchAmount; // Not really needed for fixed quantifiers.
static unsigned beginIndex() { return offsetof(BackTrackInfoBackReference, begin) / sizeof(uintptr_t); }
static unsigned matchAmountIndex() { return offsetof(BackTrackInfoBackReference, matchAmount) / sizeof(uintptr_t); }
};
struct BackTrackInfoAlternative {
union {
uintptr_t offset;
};
};
struct BackTrackInfoParentheticalAssertion {
uintptr_t begin;
static unsigned beginIndex() { return offsetof(BackTrackInfoParentheticalAssertion, begin) / sizeof(uintptr_t); }
};
struct BackTrackInfoParenthesesOnce {
uintptr_t begin;
uintptr_t returnAddress;
static unsigned beginIndex() { return offsetof(BackTrackInfoParenthesesOnce, begin) / sizeof(uintptr_t); }
static unsigned returnAddressIndex() { return offsetof(BackTrackInfoParenthesesOnce, returnAddress) / sizeof(uintptr_t); }
};
struct BackTrackInfoParenthesesTerminal {
uintptr_t begin;
static unsigned beginIndex() { return offsetof(BackTrackInfoParenthesesTerminal, begin) / sizeof(uintptr_t); }
};
struct BackTrackInfoParentheses {
uintptr_t begin;
uintptr_t returnAddress;
uintptr_t matchAmount;
uintptr_t parenContextHead;
static unsigned beginIndex() { return offsetof(BackTrackInfoParentheses, begin) / sizeof(uintptr_t); }
static unsigned returnAddressIndex() { return offsetof(BackTrackInfoParentheses, returnAddress) / sizeof(uintptr_t); }
static unsigned matchAmountIndex() { return offsetof(BackTrackInfoParentheses, matchAmount) / sizeof(uintptr_t); }
static unsigned parenContextHeadIndex() { return offsetof(BackTrackInfoParentheses, parenContextHead) / sizeof(uintptr_t); }
};
} } // namespace JSC::Yarr