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/*
* Copyright 2010, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 THE COPYRIGHT HOLDERS ``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 COMPUTER, 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.
*/
#include "config.h"
#include "Hyphenation.h"
// For external hyphenation library.
#include "hyphen.h"
#include <androidfw/AssetManager.h>
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>
extern android::AssetManager* globalAssetManager();
using namespace WTF;
namespace WebCore {
static HyphenDict* loadHyphenationDictionary()
{
android::AssetManager* am = globalAssetManager();
// Only support English for now.
android::Asset* a = am->open("webkit/hyph_en_US.dic",
android::Asset::ACCESS_BUFFER);
if (!a) {
// Asset webkit/hyph_en_US.dic not found!
return 0;
}
const CString dictContents = String(static_cast<const char*>(a->getBuffer(false)),
a->getLength()).utf8();
HyphenDict* dict = hnj_hyphen_load_from_buffer(dictContents.data(),
dictContents.length());
delete a;
return dict;
}
bool canHyphenate(const AtomicString& /* localeIdentifier */)
{
// FIXME: Check that the locale identifier matches the available dictionary.
return true;
}
size_t lastHyphenLocation(const UChar* characters, size_t length, size_t beforeIndex, const AtomicString& /* localeIdentifier */)
{
static const size_t minWordLen = 5;
static const size_t maxWordLen = 100;
if (beforeIndex <= 0 || length < minWordLen || length > maxWordLen)
return 0;
static HyphenDict* dict = loadHyphenationDictionary();
if (!dict)
return 0;
char word[maxWordLen];
size_t wordLength = 0;
for (size_t i = 0; i < length; ++i) {
const UChar ch = characters[i];
// Only English for now.
// To really make it language aware, we need something like language
// detection or rely on the langAttr in the html element. Though
// seems right now the langAttr is not used or quite implemented in
// webkit.
if (!isASCIIAlpha(ch)) {
// Bypass leading spaces.
if (isASCIISpace(ch) && !wordLength)
continue;
return 0;
}
word[wordLength++] = ch;
}
if (wordLength < minWordLen)
return 0;
static const int extraBuffer = 5;
const int leadingSpacesCount = length - wordLength;
char hyphens[maxWordLen + extraBuffer];
if (!hnj_hyphen_hyphenate(dict, word, wordLength, hyphens)) {
for (size_t i = beforeIndex - 2 - leadingSpacesCount; i > 0; --i) {
if (hyphens[i] & 1)
return i + 1 + leadingSpacesCount;
}
}
return 0;
}
} // namespace WebCore
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