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+/*
+ * Copyright (C) 2009, 2010 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 YarrInterpreter_h
+#define YarrInterpreter_h
+
+#include "YarrPattern.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/unicode/Unicode.h>
+
+namespace WTF {
+class BumpPointerAllocator;
+}
+using WTF::BumpPointerAllocator;
+
+namespace JSC { namespace Yarr {
+
+class ByteDisjunction;
+
+struct ByteTerm {
+ enum Type {
+ TypeBodyAlternativeBegin,
+ TypeBodyAlternativeDisjunction,
+ TypeBodyAlternativeEnd,
+ TypeAlternativeBegin,
+ TypeAlternativeDisjunction,
+ TypeAlternativeEnd,
+ TypeSubpatternBegin,
+ TypeSubpatternEnd,
+ TypeAssertionBOL,
+ TypeAssertionEOL,
+ TypeAssertionWordBoundary,
+ TypePatternCharacterOnce,
+ TypePatternCharacterFixed,
+ TypePatternCharacterGreedy,
+ TypePatternCharacterNonGreedy,
+ TypePatternCasedCharacterOnce,
+ TypePatternCasedCharacterFixed,
+ TypePatternCasedCharacterGreedy,
+ TypePatternCasedCharacterNonGreedy,
+ TypeCharacterClass,
+ TypeBackReference,
+ TypeParenthesesSubpattern,
+ TypeParenthesesSubpatternOnceBegin,
+ TypeParenthesesSubpatternOnceEnd,
+ TypeParenthesesSubpatternTerminalBegin,
+ TypeParenthesesSubpatternTerminalEnd,
+ TypeParentheticalAssertionBegin,
+ TypeParentheticalAssertionEnd,
+ TypeCheckInput,
+ TypeUncheckInput,
+ TypeDotStarEnclosure,
+ } type;
+ union {
+ struct {
+ union {
+ UChar patternCharacter;
+ struct {
+ UChar lo;
+ UChar hi;
+ } casedCharacter;
+ CharacterClass* characterClass;
+ unsigned subpatternId;
+ };
+ union {
+ ByteDisjunction* parenthesesDisjunction;
+ unsigned parenthesesWidth;
+ };
+ QuantifierType quantityType;
+ unsigned quantityCount;
+ } atom;
+ struct {
+ int next;
+ int end;
+ bool onceThrough;
+ } alternative;
+ struct {
+ bool m_bol : 1;
+ bool m_eol : 1;
+ } anchors;
+ unsigned checkInputCount;
+ };
+ unsigned frameLocation;
+ bool m_capture : 1;
+ bool m_invert : 1;
+ unsigned inputPosition;
+
+ ByteTerm(UChar ch, int inputPos, unsigned frameLocation, Checked<unsigned> quantityCount, QuantifierType quantityType)
+ : frameLocation(frameLocation)
+ , m_capture(false)
+ , m_invert(false)
+ {
+ switch (quantityType) {
+ case QuantifierFixedCount:
+ type = (quantityCount == 1) ? ByteTerm::TypePatternCharacterOnce : ByteTerm::TypePatternCharacterFixed;
+ break;
+ case QuantifierGreedy:
+ type = ByteTerm::TypePatternCharacterGreedy;
+ break;
+ case QuantifierNonGreedy:
+ type = ByteTerm::TypePatternCharacterNonGreedy;
+ break;
+ }
+
+ atom.patternCharacter = ch;
+ atom.quantityType = quantityType;
+ atom.quantityCount = quantityCount.unsafeGet();
+ inputPosition = inputPos;
+ }
+
+ ByteTerm(UChar lo, UChar hi, int inputPos, unsigned frameLocation, Checked<unsigned> quantityCount, QuantifierType quantityType)
+ : frameLocation(frameLocation)
+ , m_capture(false)
+ , m_invert(false)
+ {
+ switch (quantityType) {
+ case QuantifierFixedCount:
+ type = (quantityCount == 1) ? ByteTerm::TypePatternCasedCharacterOnce : ByteTerm::TypePatternCasedCharacterFixed;
+ break;
+ case QuantifierGreedy:
+ type = ByteTerm::TypePatternCasedCharacterGreedy;
+ break;
+ case QuantifierNonGreedy:
+ type = ByteTerm::TypePatternCasedCharacterNonGreedy;
+ break;
+ }
+
+ atom.casedCharacter.lo = lo;
+ atom.casedCharacter.hi = hi;
+ atom.quantityType = quantityType;
+ atom.quantityCount = quantityCount.unsafeGet();
+ inputPosition = inputPos;
+ }
+
+ ByteTerm(CharacterClass* characterClass, bool invert, int inputPos)
+ : type(ByteTerm::TypeCharacterClass)
+ , m_capture(false)
+ , m_invert(invert)
+ {
+ atom.characterClass = characterClass;
+ atom.quantityType = QuantifierFixedCount;
+ atom.quantityCount = 1;
+ inputPosition = inputPos;
+ }
+
+ ByteTerm(Type type, unsigned subpatternId, ByteDisjunction* parenthesesInfo, bool capture, int inputPos)
+ : type(type)
+ , m_capture(capture)
+ , m_invert(false)
+ {
+ atom.subpatternId = subpatternId;
+ atom.parenthesesDisjunction = parenthesesInfo;
+ atom.quantityType = QuantifierFixedCount;
+ atom.quantityCount = 1;
+ inputPosition = inputPos;
+ }
+
+ ByteTerm(Type type, bool invert = false)
+ : type(type)
+ , m_capture(false)
+ , m_invert(invert)
+ {
+ atom.quantityType = QuantifierFixedCount;
+ atom.quantityCount = 1;
+ }
+
+ ByteTerm(Type type, unsigned subpatternId, bool capture, bool invert, int inputPos)
+ : type(type)
+ , m_capture(capture)
+ , m_invert(invert)
+ {
+ atom.subpatternId = subpatternId;
+ atom.quantityType = QuantifierFixedCount;
+ atom.quantityCount = 1;
+ inputPosition = inputPos;
+ }
+
+ static ByteTerm BOL(int inputPos)
+ {
+ ByteTerm term(TypeAssertionBOL);
+ term.inputPosition = inputPos;
+ return term;
+ }
+
+ static ByteTerm CheckInput(Checked<unsigned> count)
+ {
+ ByteTerm term(TypeCheckInput);
+ term.checkInputCount = count.unsafeGet();
+ return term;
+ }
+
+ static ByteTerm UncheckInput(Checked<unsigned> count)
+ {
+ ByteTerm term(TypeUncheckInput);
+ term.checkInputCount = count.unsafeGet();
+ return term;
+ }
+
+ static ByteTerm EOL(int inputPos)
+ {
+ ByteTerm term(TypeAssertionEOL);
+ term.inputPosition = inputPos;
+ return term;
+ }
+
+ static ByteTerm WordBoundary(bool invert, int inputPos)
+ {
+ ByteTerm term(TypeAssertionWordBoundary, invert);
+ term.inputPosition = inputPos;
+ return term;
+ }
+
+ static ByteTerm BackReference(unsigned subpatternId, int inputPos)
+ {
+ return ByteTerm(TypeBackReference, subpatternId, false, false, inputPos);
+ }
+
+ static ByteTerm BodyAlternativeBegin(bool onceThrough)
+ {
+ ByteTerm term(TypeBodyAlternativeBegin);
+ term.alternative.next = 0;
+ term.alternative.end = 0;
+ term.alternative.onceThrough = onceThrough;
+ return term;
+ }
+
+ static ByteTerm BodyAlternativeDisjunction(bool onceThrough)
+ {
+ ByteTerm term(TypeBodyAlternativeDisjunction);
+ term.alternative.next = 0;
+ term.alternative.end = 0;
+ term.alternative.onceThrough = onceThrough;
+ return term;
+ }
+
+ static ByteTerm BodyAlternativeEnd()
+ {
+ ByteTerm term(TypeBodyAlternativeEnd);
+ term.alternative.next = 0;
+ term.alternative.end = 0;
+ term.alternative.onceThrough = false;
+ return term;
+ }
+
+ static ByteTerm AlternativeBegin()
+ {
+ ByteTerm term(TypeAlternativeBegin);
+ term.alternative.next = 0;
+ term.alternative.end = 0;
+ term.alternative.onceThrough = false;
+ return term;
+ }
+
+ static ByteTerm AlternativeDisjunction()
+ {
+ ByteTerm term(TypeAlternativeDisjunction);
+ term.alternative.next = 0;
+ term.alternative.end = 0;
+ term.alternative.onceThrough = false;
+ return term;
+ }
+
+ static ByteTerm AlternativeEnd()
+ {
+ ByteTerm term(TypeAlternativeEnd);
+ term.alternative.next = 0;
+ term.alternative.end = 0;
+ term.alternative.onceThrough = false;
+ return term;
+ }
+
+ static ByteTerm SubpatternBegin()
+ {
+ return ByteTerm(TypeSubpatternBegin);
+ }
+
+ static ByteTerm SubpatternEnd()
+ {
+ return ByteTerm(TypeSubpatternEnd);
+ }
+
+ static ByteTerm DotStarEnclosure(bool bolAnchor, bool eolAnchor)
+ {
+ ByteTerm term(TypeDotStarEnclosure);
+ term.anchors.m_bol = bolAnchor;
+ term.anchors.m_eol = eolAnchor;
+ return term;
+ }
+
+ bool invert()
+ {
+ return m_invert;
+ }
+
+ bool capture()
+ {
+ return m_capture;
+ }
+};
+
+class ByteDisjunction {
+ WTF_MAKE_FAST_ALLOCATED;
+public:
+ ByteDisjunction(unsigned numSubpatterns, unsigned frameSize)
+ : m_numSubpatterns(numSubpatterns)
+ , m_frameSize(frameSize)
+ {
+ }
+
+ Vector<ByteTerm> terms;
+ unsigned m_numSubpatterns;
+ unsigned m_frameSize;
+};
+
+struct BytecodePattern {
+ WTF_MAKE_FAST_ALLOCATED;
+public:
+ BytecodePattern(PassOwnPtr<ByteDisjunction> body, Vector<OwnPtr<ByteDisjunction> >& parenthesesInfoToAdopt, YarrPattern& pattern, BumpPointerAllocator* allocator)
+ : m_body(body)
+ , m_ignoreCase(pattern.m_ignoreCase)
+ , m_multiline(pattern.m_multiline)
+ , m_allocator(allocator)
+ {
+ m_body->terms.shrinkToFit();
+
+ newlineCharacterClass = pattern.newlineCharacterClass();
+ wordcharCharacterClass = pattern.wordcharCharacterClass();
+
+ m_allParenthesesInfo.swap(parenthesesInfoToAdopt);
+ m_allParenthesesInfo.shrinkToFit();
+
+ m_userCharacterClasses.swap(pattern.m_userCharacterClasses);
+ m_userCharacterClasses.shrinkToFit();
+ }
+
+ OwnPtr<ByteDisjunction> m_body;
+ bool m_ignoreCase;
+ bool m_multiline;
+ // Each BytecodePattern is associated with a RegExp, each RegExp is associated
+ // with a JSGlobalData. Cache a pointer to out JSGlobalData's m_regExpAllocator.
+ BumpPointerAllocator* m_allocator;
+
+ CharacterClass* newlineCharacterClass;
+ CharacterClass* wordcharCharacterClass;
+
+private:
+ Vector<OwnPtr<ByteDisjunction> > m_allParenthesesInfo;
+ Vector<OwnPtr<CharacterClass> > m_userCharacterClasses;
+};
+
+JS_EXPORT_PRIVATE PassOwnPtr<BytecodePattern> byteCompile(YarrPattern&, BumpPointerAllocator*);
+JS_EXPORT_PRIVATE unsigned interpret(BytecodePattern*, const String& input, unsigned start, unsigned* output);
+unsigned interpret(BytecodePattern*, const LChar* input, unsigned length, unsigned start, unsigned* output);
+unsigned interpret(BytecodePattern*, const UChar* input, unsigned length, unsigned start, unsigned* output);
+
+} } // namespace JSC::Yarr
+
+#endif // YarrInterpreter_h
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