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/*
* Copyright (C) 2012 Igalia S.L.
* Copyright (C) 2012 Samsung Electronics
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "TextCheckerEnchant.h"
#if ENABLE(SPELLCHECK)
#include <Language.h>
#include <editing/visible_units.h>
#include <glib.h>
#include <text/TextBreakIterator.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringBuilder.h>
using namespace WebCore;
static const size_t maximumNumberOfSuggestions = 10;
static void enchantDictDescribeCallback(const char* const languageTag, const char* const, const char* const, const char* const, void* data)
{
Vector<CString>* dictionaries = static_cast<Vector<CString>*>(data);
dictionaries->append(languageTag);
}
TextCheckerEnchant::TextCheckerEnchant()
: m_broker(enchant_broker_init())
, m_enchantDictionaries(0)
{
}
TextCheckerEnchant::~TextCheckerEnchant()
{
if (!m_broker)
return;
freeEnchantBrokerDictionaries();
enchant_broker_free(m_broker);
}
void TextCheckerEnchant::ignoreWord(const String& word)
{
for (Vector<EnchantDict*>::const_iterator iter = m_enchantDictionaries.begin(); iter != m_enchantDictionaries.end(); ++iter)
enchant_dict_add_to_session(*iter, word.utf8().data(), -1);
}
void TextCheckerEnchant::learnWord(const String& word)
{
for (Vector<EnchantDict*>::const_iterator iter = m_enchantDictionaries.begin(); iter != m_enchantDictionaries.end(); ++iter)
enchant_dict_add_to_personal(*iter, word.utf8().data(), -1);
}
void TextCheckerEnchant::checkSpellingOfString(const String& string, int& misspellingLocation, int& misspellingLength)
{
// Assume that the words in the string are spelled correctly.
misspellingLocation = -1;
misspellingLength = 0;
if (!hasDictionary())
return;
size_t numberOfCharacters = string.length();
TextBreakIterator* iter = wordBreakIterator(string.characters(), numberOfCharacters);
if (!iter)
return;
CString utf8String = string.utf8();
const char* cString = utf8String.data();
for (size_t i = 0; i < numberOfCharacters + 1; i++) {
// We go through each character until we find the beginning of the word
// then we get into an inner loop to find the end of the word corresponding
// to it.
if (isLogicalStartOfWord(iter, i)) {
int start = i;
int end = i;
int wordLength;
while (!islogicalEndOfWord(iter, end))
end++;
wordLength = end - start;
// Set the iterator to be at the current word end, so we don't
// check characters twice.
i = end;
char* cstart = g_utf8_offset_to_pointer(cString, start);
int numberOfBytes = static_cast<int>(g_utf8_offset_to_pointer(cString, end) - cstart);
for (Vector<EnchantDict*>::const_iterator dictIter = m_enchantDictionaries.begin(); dictIter != m_enchantDictionaries.end(); ++dictIter) {
if (enchant_dict_check(*dictIter, cstart, numberOfBytes)) {
misspellingLocation = start;
misspellingLength = wordLength;
} else {
// Stop checking, this word is ok in at least one dict.
misspellingLocation = -1;
misspellingLength = 0;
break;
}
}
}
}
}
Vector<String> TextCheckerEnchant::getGuessesForWord(const String& word)
{
Vector<String> guesses;
if (!hasDictionary())
return guesses;
for (Vector<EnchantDict*>::const_iterator iter = m_enchantDictionaries.begin(); iter != m_enchantDictionaries.end(); ++iter) {
size_t numberOfSuggestions;
size_t i;
char** suggestions = enchant_dict_suggest(*iter, word.utf8().data(), -1, &numberOfSuggestions);
if (numberOfSuggestions <= 0)
continue;
if (numberOfSuggestions > maximumNumberOfSuggestions)
numberOfSuggestions = maximumNumberOfSuggestions;
for (i = 0; i < numberOfSuggestions; i++)
guesses.append(String(suggestions[i]));
enchant_dict_free_suggestions(*iter, suggestions);
}
return guesses;
}
void TextCheckerEnchant::updateSpellCheckingLanguages(const Vector<String>& languages)
{
Vector<EnchantDict*> spellDictionaries;
if (!languages.isEmpty()) {
for (Vector<String>::const_iterator iter = languages.begin(); iter != languages.end(); ++iter) {
CString currentLanguage = iter->utf8();
if (enchant_broker_dict_exists(m_broker, currentLanguage.data())) {
EnchantDict* dict = enchant_broker_request_dict(m_broker, currentLanguage.data());
spellDictionaries.append(dict);
}
}
} else {
// Languages are not specified by user, try to get default language.
CString utf8Language = defaultLanguage().utf8();
const char* language = utf8Language.data();
if (enchant_broker_dict_exists(m_broker, language)) {
EnchantDict* dict = enchant_broker_request_dict(m_broker, language);
spellDictionaries.append(dict);
} else {
// No dictionaries selected, we get the first one from the list.
Vector<CString> allDictionaries;
enchant_broker_list_dicts(m_broker, enchantDictDescribeCallback, &allDictionaries);
if (!allDictionaries.isEmpty()) {
EnchantDict* dict = enchant_broker_request_dict(m_broker, allDictionaries.first().data());
spellDictionaries.append(dict);
}
}
}
freeEnchantBrokerDictionaries();
m_enchantDictionaries = spellDictionaries;
}
Vector<String> TextCheckerEnchant::loadedSpellCheckingLanguages() const
{
Vector<String> languages;
if (!hasDictionary())
return languages;
// Get a Vector<CString> with the list of languages in use.
Vector<CString> currentDictionaries;
for (Vector<EnchantDict*>::const_iterator iter = m_enchantDictionaries.begin(); iter != m_enchantDictionaries.end(); ++iter)
enchant_dict_describe(*iter, enchantDictDescribeCallback, ¤tDictionaries);
for (Vector<CString>::const_iterator iter = currentDictionaries.begin(); iter != currentDictionaries.end(); ++iter)
languages.append(String::fromUTF8(iter->data()));
return languages;
}
Vector<String> TextCheckerEnchant::availableSpellCheckingLanguages() const
{
Vector<CString> allDictionaries;
enchant_broker_list_dicts(m_broker, enchantDictDescribeCallback, &allDictionaries);
Vector<String> languages;
for (Vector<CString>::const_iterator iter = allDictionaries.begin(); iter != allDictionaries.end(); ++iter)
languages.append(String::fromUTF8(iter->data()));
return languages;
}
void TextCheckerEnchant::freeEnchantBrokerDictionaries()
{
for (Vector<EnchantDict*>::const_iterator iter = m_enchantDictionaries.begin(); iter != m_enchantDictionaries.end(); ++iter)
enchant_broker_free_dict(m_broker, *iter);
}
#endif // ENABLE(SPELLCHECK)
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