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      1 /*
      2  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef TextCheckingHelper_h
     22 #define TextCheckingHelper_h
     23 
     24 #include "core/dom/Position.h"
     25 #include "platform/heap/Handle.h"
     26 #include "platform/text/TextChecking.h"
     27 #include "wtf/text/WTFString.h"
     28 
     29 namespace blink {
     30 
     31 class ExceptionState;
     32 class LocalFrame;
     33 class Range;
     34 class SpellCheckerClient;
     35 class TextCheckerClient;
     36 struct TextCheckingResult;
     37 
     38 class TextCheckingParagraph {
     39     STACK_ALLOCATED();
     40 public:
     41     explicit TextCheckingParagraph(PassRefPtrWillBeRawPtr<Range> checkingRange);
     42     TextCheckingParagraph(PassRefPtrWillBeRawPtr<Range> checkingRange, PassRefPtrWillBeRawPtr<Range> paragraphRange);
     43     ~TextCheckingParagraph();
     44 
     45     int rangeLength() const;
     46     PassRefPtrWillBeRawPtr<Range> subrange(int characterOffset, int characterCount) const;
     47     int offsetTo(const Position&, ExceptionState&) const;
     48     void expandRangeToNextEnd();
     49 
     50     const String& text() const;
     51     // Why not let clients call these functions on text() themselves?
     52     String textSubstring(unsigned pos, unsigned len = INT_MAX) const { return text().substring(pos, len); }
     53     UChar textCharAt(int index) const { return text()[static_cast<unsigned>(index)]; }
     54 
     55     bool isEmpty() const;
     56     bool isTextEmpty() const { return text().isEmpty(); }
     57     bool isRangeEmpty() const { return checkingStart() >= checkingEnd(); }
     58 
     59     int checkingStart() const;
     60     int checkingEnd() const;
     61     int checkingLength() const;
     62     String checkingSubstring() const { return textSubstring(checkingStart(), checkingLength()); }
     63 
     64     bool checkingRangeCovers(int location, int length) const { return location < checkingEnd() && location + length > checkingStart(); }
     65     PassRefPtrWillBeRawPtr<Range> paragraphRange() const;
     66     PassRefPtrWillBeRawPtr<Range> checkingRange() const { return m_checkingRange; }
     67 
     68 private:
     69     void invalidateParagraphRangeValues();
     70     PassRefPtrWillBeRawPtr<Range> offsetAsRange() const;
     71 
     72     RefPtrWillBeMember<Range> m_checkingRange;
     73     mutable RefPtrWillBeMember<Range> m_paragraphRange;
     74     mutable RefPtrWillBeMember<Range> m_offsetAsRange;
     75     mutable String m_text;
     76     mutable int m_checkingStart;
     77     mutable int m_checkingEnd;
     78     mutable int m_checkingLength;
     79 };
     80 
     81 class TextCheckingHelper {
     82     WTF_MAKE_NONCOPYABLE(TextCheckingHelper);
     83     STACK_ALLOCATED();
     84 public:
     85     TextCheckingHelper(SpellCheckerClient&, const Position& start, const Position& end);
     86     ~TextCheckingHelper();
     87 
     88     String findFirstMisspelling(int& firstMisspellingOffset, bool markAll, RefPtrWillBeRawPtr<Range>& firstMisspellingRange);
     89     String findFirstMisspellingOrBadGrammar(bool checkGrammar, bool& outIsSpelling, int& outFirstFoundOffset, GrammarDetail& outGrammarDetail);
     90     String findFirstBadGrammar(GrammarDetail& outGrammarDetail, int& outGrammarPhraseOffset, bool markAll);
     91     void markAllMisspellings(RefPtrWillBeRawPtr<Range>& firstMisspellingRange);
     92     void markAllBadGrammar();
     93 
     94 private:
     95     SpellCheckerClient* m_client;
     96     Position m_start;
     97     Position m_end;
     98 
     99     int findFirstGrammarDetail(const Vector<GrammarDetail>& grammarDetails, int badGrammarPhraseLocation, int startOffset, int endOffset, bool markAll) const;
    100     bool unifiedTextCheckerEnabled() const;
    101 };
    102 
    103 void checkTextOfParagraph(TextCheckerClient&, const String&, TextCheckingTypeMask, Vector<TextCheckingResult>&);
    104 
    105 bool unifiedTextCheckerEnabled(const LocalFrame*);
    106 
    107 } // namespace blink
    108 
    109 #endif // TextCheckingHelper_h
    110