1/*
2 * Copyright (C) 2006 Lars Knoll <lars@trolltech.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 *
19 */
20
21#include "config.h"
22#include "TextBreakIterator.h"
23
24#include <QtCore/qtextboundaryfinder.h>
25#include <algorithm>
26#include <qdebug.h>
27
28// #define DEBUG_TEXT_ITERATORS
29#ifdef DEBUG_TEXT_ITERATORS
30#define DEBUG qDebug
31#else
32#define DEBUG if (1) {} else qDebug
33#endif
34
35using namespace std;
36
37namespace WebCore {
38
39#if USE(QT_ICU_TEXT_BREAKING)
40const char* currentTextBreakLocaleID()
41{
42    return QLocale::system().name().toLatin1();
43}
44#else
45    class TextBreakIterator : public QTextBoundaryFinder {
46    public:
47        TextBreakIterator(QTextBoundaryFinder::BoundaryType type, const QString& string)
48            : QTextBoundaryFinder(type, string)
49        { }
50        TextBreakIterator()
51            : QTextBoundaryFinder()
52        { }
53    };
54
55    TextBreakIterator* setUpIterator(TextBreakIterator& iterator, QTextBoundaryFinder::BoundaryType type, const UChar* characters, int length)
56    {
57        if (!characters || !length)
58            return 0;
59
60        if (iterator.isValid() && type == iterator.type() && iterator.string() == QString::fromRawData(reinterpret_cast<const QChar*>(characters), length)) {
61            iterator.toStart();
62            return &iterator;
63        }
64
65        iterator = TextBreakIterator(type, QString(reinterpret_cast<const QChar*>(characters), length));
66        return &iterator;
67    }
68
69    TextBreakIterator* wordBreakIterator(const UChar* string, int length)
70    {
71        static TextBreakIterator staticWordBreakIterator;
72        return setUpIterator(staticWordBreakIterator, QTextBoundaryFinder::Word, string, length);
73    }
74
75    TextBreakIterator* characterBreakIterator(const UChar* string, int length)
76    {
77        static TextBreakIterator staticCharacterBreakIterator;
78        return setUpIterator(staticCharacterBreakIterator, QTextBoundaryFinder::Grapheme, string, length);
79    }
80
81    TextBreakIterator* cursorMovementIterator(const UChar* string, int length)
82    {
83        return characterBreakIterator(string, length);
84    }
85
86    static TextBreakIterator* staticLineBreakIterator;
87
88    TextBreakIterator* acquireLineBreakIterator(const UChar* string, int length)
89    {
90        TextBreakIterator* lineBreakIterator = 0;
91        if (staticLineBreakIterator) {
92            setUpIterator(*staticLineBreakIterator, QTextBoundaryFinder::Line, string, length);
93            std::swap(staticLineBreakIterator, lineBreakIterator);
94        }
95
96        if (!lineBreakIterator && string && length)
97            lineBreakIterator = new TextBreakIterator(QTextBoundaryFinder::Line, QString(reinterpret_cast<const QChar*>(string), length));
98
99        return lineBreakIterator;
100    }
101
102    void releaseLineBreakIterator(TextBreakIterator* iterator)
103    {
104        ASSERT(iterator);
105
106        if (!staticLineBreakIterator)
107            staticLineBreakIterator = iterator;
108        else
109            delete iterator;
110    }
111
112    TextBreakIterator* sentenceBreakIterator(const UChar* string, int length)
113    {
114        static TextBreakIterator staticSentenceBreakIterator;
115        return setUpIterator(staticSentenceBreakIterator, QTextBoundaryFinder::Sentence, string, length);
116
117    }
118
119    int textBreakFirst(TextBreakIterator* bi)
120    {
121        bi->toStart();
122        DEBUG() << "textBreakFirst" << bi->position();
123        return bi->position();
124    }
125
126    int textBreakNext(TextBreakIterator* bi)
127    {
128        int pos = bi->toNextBoundary();
129        DEBUG() << "textBreakNext" << pos;
130        return pos;
131    }
132
133    int textBreakPreceding(TextBreakIterator* bi, int pos)
134    {
135        bi->setPosition(pos);
136        int newpos = bi->toPreviousBoundary();
137        DEBUG() << "textBreakPreceding" << pos << newpos;
138        return newpos;
139    }
140
141    int textBreakFollowing(TextBreakIterator* bi, int pos)
142    {
143        bi->setPosition(pos);
144        int newpos = bi->toNextBoundary();
145        DEBUG() << "textBreakFollowing" << pos << newpos;
146        return newpos;
147    }
148
149    int textBreakCurrent(TextBreakIterator* bi)
150    {
151        return bi->position();
152    }
153
154    bool isTextBreak(TextBreakIterator*, int)
155    {
156        return true;
157    }
158#endif
159
160}
161