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/*
* Qt implementation of TCIME library
* This file is part of the Qt Virtual Keyboard module.
* Contact: http://www.qt.io/licensing/
*
* Copyright (C) 2015 The Qt Company
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "zhuyintable.h"
#include <QStringView>
using namespace tcime;
// All Chinese characters are mapped into a zhuyin table as described in
// http://en.wikipedia.org/wiki/Zhuyin_table.
const int INITIALS_SIZE = 22;
// Finals that can be appended after 'ㄧ' (yi), 'ㄨ' (wu), or 'ㄩ' (yu).
static Q_CONSTEXPR char16_t yiEndingFinals[] =
u"\x311a\x311b\x311d\x311e\x3120\x3121\x3122\x3123\x3124\x3125";
static Q_CONSTEXPR char16_t wuEndingFinals[] =
u"\x311a\x311b\x311e\x311f\x3122\x3123\x3124\x3125";
static Q_CONSTEXPR char16_t yuEndingFinals[] =
u"\x311d\x3122\x3123\x3125";
// 'ㄧ' (yi) finals start from position 14 and are followed by 'ㄨ' (wu)
// finals, and 'ㄩ' (yu) finals follow after 'ㄨ' (wu) finals.
const int YI_FINALS_INDEX = 14;
const int WU_FINALS_INDEX = 25;
const int YU_FINALS_INDEX = 34;
// 'ㄧ' (yi), 'ㄨ' (wu) , and 'ㄩ' (yu) finals.
const QChar YI_FINALS(0x3127);
const QChar WU_FINALS(0x3128);
const QChar YU_FINALS (0x3129);
const QChar ZhuyinTable::DEFAULT_TONE = QLatin1Char(' ');
// Default tone and four tone symbols: '˙', 'ˊ', 'ˇ', and 'ˋ'.
static Q_CONSTEXPR char16_t tones[] = u" \x02d9\x02ca\x02c7\x02cb";
int ZhuyinTable::getInitials(QChar initials)
{
// Calculate the index by its distance to the first initials 'ㄅ' (b).
int index = initials.unicode() - 0x3105 + 1;
if (index >= INITIALS_SIZE)
// Syllables starting with finals can still be valid.
return 0;
return (index >= 0) ? index : -1;
}
int ZhuyinTable::getFinals(QStringView finals)
{
if (finals.length() == 0)
// Syllables ending with no finals can still be valid.
return 0;
if (finals.length() > 2)
return -1;
// Compute the index instead of direct lookup the whole array to save
// traversing time. First calculate the distance to the first finals
// 'ㄚ' (a).
const QChar firstFinal = finals.at(0);
int index = firstFinal.unicode() - 0x311a + 1;
if (index < YI_FINALS_INDEX)
return index;
// Check 'ㄧ' (yi), 'ㄨ' (wu) , and 'ㄩ' (yu) group finals.
QStringView endingFinals;
if (firstFinal == YI_FINALS) {
index = YI_FINALS_INDEX;
endingFinals = yiEndingFinals;
} else if (firstFinal == WU_FINALS) {
index = WU_FINALS_INDEX;
endingFinals = wuEndingFinals;
} else if (firstFinal == YU_FINALS) {
index = YU_FINALS_INDEX;
endingFinals = yuEndingFinals;
} else {
return -1;
}
if (finals.length() == 1)
return index;
for (int i = 0; i < endingFinals.size(); ++i) {
if (finals.at(1) == endingFinals[i])
return index + i + 1;
}
return -1;
}
int ZhuyinTable::getSyllablesIndex(QStringView syllables)
{
if (syllables.isEmpty())
return -1;
int initials = getInitials(syllables.at(0));
if (initials < 0)
return -1;
// Strip out initials before getting finals column-index.
int finals = getFinals((initials != 0) ? syllables.mid(1) : syllables);
if (finals < 0)
return -1;
return (finals * INITIALS_SIZE + initials);
}
int ZhuyinTable::getTones(QChar c)
{
const qsizetype i = QStringView(tones).indexOf(c);
if (i >= 0)
return int(i);
// Treat all other characters as the default tone with the index 0.
return 0;
}
int ZhuyinTable::getTonesCount()
{
return int(QStringView(tones).size());
}
bool ZhuyinTable::isTone(QChar c)
{
return QStringView(tones).contains(c);
}
bool ZhuyinTable::isYiWuYuFinals(QChar c)
{
return c == YI_FINALS || c == WU_FINALS || c == YU_FINALS;
}
auto ZhuyinTable::stripTones(QStringView input) -> StripTonesResult
{
StripTonesResult result;
result.ok = false;
if (input.isEmpty())
return result;
const QChar tone = input.back();
if (isTone(tone)) {
QStringView syllables = input.chopped(1);
if (!syllables.isEmpty()) {
result.pair[0] = syllables;
result.pair[1] = input.right(1);
result.ok = true;
}
} else {
// Treat the tone-less input as the default tone (tone-0).
result.pair[0] = input;
result.pair[1] = QStringView(&DEFAULT_TONE, 1);
result.ok = true;
}
return result;
}
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