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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 "cangjietable.h"
using namespace tcime;
const int CangjieTable::MAX_CODE_LENGTH = 5;
const int CangjieTable::MAX_SIMPLIFIED_CODE_LENGTH = 2;
// Cangjie 25 letters with number-index starting from 1:
// 日月金木水火土竹戈十大中一弓人心手口尸廿山女田難卜
static const int BASE_NUMBER = 26;
static Q_CONSTEXPR char16_t letters[] =
u"\x65e5\x6708\x91d1\x6728\x6c34\x706b\x571f\x7af9\x6208\x5341\x5927\x4e2d\x4e00\x5f13"
u"\x4eba\x5fc3\x624b\x53e3\x5c38\x5eff\x5c71\x5973\x7530\x96e3\x535c";
bool CangjieTable::isLetter(QChar c) noexcept
{
return QStringView(letters).contains(c);
}
int CangjieTable::getPrimaryIndex(QStringView code) noexcept
{
const qsizetype length = code.size();
if ((length < 1) || (length > MAX_CODE_LENGTH))
return -1;
QChar c = code.front();
if (!isLetter(c))
return -1;
// The first letter cannot be absent in the code; therefore, the numerical
// index of the first letter starts from 0 instead.
int index = QStringView(letters).indexOf(c) * BASE_NUMBER;
if (length < 2)
return index;
c = code.back();
if (!isLetter(c))
return -1;
return index + QStringView(letters).indexOf(c) + 1;
}
int CangjieTable::getSecondaryIndex(QStringView code) noexcept
{
int index = 0;
const qsizetype last = code.size() - 1;
for (int i = 1; i < last; i++) {
QChar c = code.at(i);
if (!isLetter(c))
return -1;
index = index * BASE_NUMBER + QStringView(letters).indexOf(c) + 1;
}
int maxEnd = MAX_CODE_LENGTH - 1;
for (int i = last; i < maxEnd; i++)
index = index * BASE_NUMBER;
return index;
}
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