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diff --git a/Source/WebCore/editing/TextCheckingHelper.h b/Source/WebCore/editing/TextCheckingHelper.h
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+++ b/Source/WebCore/editing/TextCheckingHelper.h
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+/*
+ * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef TextCheckingHelper_h
+#define TextCheckingHelper_h
+
+#include "EditorClient.h"
+
+namespace WebCore {
+
+class Range;
+class Position;
+
+class TextCheckingParagraph {
+public:
+    explicit TextCheckingParagraph(PassRefPtr<Range> checkingRange);
+    ~TextCheckingParagraph();
+
+    int rangeLength() const;
+    PassRefPtr<Range> subrange(int characterOffset, int characterCount) const;
+    int offsetTo(const Position&, ExceptionCode&) const;
+    void expandRangeToNextEnd();
+
+    int textLength() const { return text().length(); }
+    String textSubstring(unsigned pos, unsigned len = UINT_MAX) const { return text().substring(pos, len); }
+    const UChar* textCharacters() const { return text().characters(); }
+    UChar textCharAt(int index) const { return text()[index]; }
+
+    bool isEmpty() const;
+    bool isTextEmpty() const { return text().isEmpty(); }
+    bool isRangeEmpty() const { return checkingStart() >= checkingEnd(); }
+
+    int checkingStart() const;
+    int checkingEnd() const;
+    int checkingLength() const;
+    String checkingSubstring() const { return textSubstring(checkingStart(), checkingLength()); }
+
+    bool checkingRangeMatches(int location, int length) const { return location == checkingStart() && length == checkingLength(); }
+    bool isCheckingRangeCoveredBy(int location, int length) const { return location <= checkingStart() && location + length >= checkingStart() + checkingLength(); }
+    bool checkingRangeCovers(int location, int length) const { return location < checkingEnd() && location + length > checkingStart(); }
+    PassRefPtr<Range> paragraphRange() const;
+
+private:
+    void invalidateParagraphRangeValues();
+    PassRefPtr<Range> checkingRange() const { return m_checkingRange; }
+    PassRefPtr<Range> offsetAsRange() const;
+    const String& text() const;
+
+    RefPtr<Range> m_checkingRange;
+    mutable RefPtr<Range> m_paragraphRange;
+    mutable RefPtr<Range> m_offsetAsRange;
+    mutable String m_text;
+    mutable int m_checkingStart;
+    mutable int m_checkingEnd;
+    mutable int m_checkingLength;
+};
+
+class TextCheckingHelper : public Noncopyable {
+public:
+    TextCheckingHelper(EditorClient*, PassRefPtr<Range>);
+    ~TextCheckingHelper();
+
+    String findFirstMisspelling(int& firstMisspellingOffset, bool markAll, RefPtr<Range>& firstMisspellingRange);
+    String findFirstMisspellingOrBadGrammar(bool checkGrammar, bool& outIsSpelling, int& outFirstFoundOffset, GrammarDetail& outGrammarDetail);
+    String findFirstBadGrammar(GrammarDetail& outGrammarDetail, int& outGrammarPhraseOffset, bool markAll);
+    int findFirstGrammarDetail(const Vector<GrammarDetail>& grammarDetails, int badGrammarPhraseLocation, int badGrammarPhraseLength, int startOffset, int endOffset, bool markAll);
+    void markAllMisspellings(RefPtr<Range>& firstMisspellingRange);
+    void markAllBadGrammar();
+
+    bool isUngrammatical(Vector<String>& guessesVector) const;
+    Vector<String> guessesForMisspelledOrUngrammaticalRange(bool checkGrammar, bool& misspelled, bool& ungrammatical) const;
+private:
+    EditorClient* m_client;
+    RefPtr<Range> m_range;
+};
+
+} // namespace WebCore
+
+#endif // TextCheckingHelper_h