1/*
2 * Qt implementation of TCIME library
3 * This file is part of the Qt Virtual Keyboard module.
4 * Contact: http://www.qt.io/licensing/
5 *
6 * Copyright (C) 2015 The Qt Company
7 * Copyright 2010 Google Inc.
8 *
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22#include "cangjiedictionary.h"
23#include "cangjietable.h"
24
25using namespace tcime;
26
27bool CangjieDictionary::_simplified = false;
28
29CangjieDictionary::CangjieDictionary() :
30 WordDictionary(),
31 _collator(QLocale(QLatin1String("zh_TW")))
32{
33}
34
35bool CangjieDictionary::simplified() const
36{
37 return _simplified;
38}
39
40void CangjieDictionary::setSimplified(bool simplified)
41{
42 _simplified = simplified;
43}
44
45QStringList CangjieDictionary::getWords(const QString &input) const
46{
47 // Look up the index in the dictionary for the specified input.
48 int primaryIndex = CangjieTable::getPrimaryIndex(code: input);
49 if (primaryIndex < 0 || primaryIndex >= dictionary().size())
50 return QStringList();
51
52 // [25 * 26] char[] array; each primary entry points to a char[]
53 // containing words with the same primary index; then words can be looked up
54 // by their secondary index stored at the beginning of each char[].
55 const DictionaryEntry &data = dictionary()[primaryIndex];
56 if (data.isEmpty())
57 return QStringList();
58
59 if (_simplified)
60 // Sort words of this primary index for simplified-cangjie.
61 return sortWords(data);
62
63 int secondaryIndex = CangjieTable::getSecondaryIndex(code: input);
64 if (secondaryIndex < 0)
65 return QStringList();
66
67 // Find words match this secondary index for cangjie.
68 return searchWords(secondaryIndex, data);
69}
70
71class DictionaryComparator
72{
73public:
74 explicit DictionaryComparator(const std::vector<QCollatorSortKey> &sortKeys) :
75 sortKeys(sortKeys)
76 {}
77
78 bool operator()(int a, int b)
79 {
80 return sortKeys[a] < sortKeys[b];
81 }
82
83private:
84 const std::vector<QCollatorSortKey> &sortKeys;
85};
86
87QStringList CangjieDictionary::sortWords(const DictionaryEntry &data) const
88{
89 int length = data.size() / 2;
90 std::vector<QCollatorSortKey> sortKeys;
91 QList<int> keys;
92 sortKeys.reserve(n: length);
93 keys.reserve(asize: length);
94 for (int i = 0; i < length; ++i) {
95 sortKeys.push_back(x: _collator.sortKey(string: data[length + i]));
96 keys.append(t: i);
97 }
98 DictionaryComparator dictionaryComparator(sortKeys);
99 std::sort(first: keys.begin(), last: keys.end(), comp: dictionaryComparator);
100
101 QStringList words;
102 for (int i = 0; i < length; ++i)
103 words.append(t: data[length + keys[i]]);
104
105 return words;
106}
107
108QStringList CangjieDictionary::searchWords(int secondaryIndex, const DictionaryEntry &data) const
109{
110 int length = data.size() / 2;
111
112 DictionaryEntry::ConstIterator start = data.constBegin();
113 DictionaryEntry::ConstIterator end = start + length;
114 DictionaryEntry::ConstIterator rangeStart = std::lower_bound(first: start, last: end, val: (DictionaryWord)secondaryIndex);
115 if (rangeStart == end || *rangeStart != QChar(secondaryIndex))
116 return QStringList();
117
118 // There may be more than one words with the same index; look up words with
119 // the same secondary index.
120 while (rangeStart != start) {
121 if (*(rangeStart - 1) != (DictionaryWord)secondaryIndex)
122 break;
123 rangeStart--;
124 }
125
126 DictionaryEntry::ConstIterator rangeEnd = rangeStart + 1;
127 while (rangeEnd != end) {
128 if (*rangeEnd != (DictionaryWord)secondaryIndex)
129 break;
130 rangeEnd++;
131 }
132
133 QStringList words;
134 words.reserve(asize: rangeEnd - rangeStart);
135 for (DictionaryEntry::ConstIterator rangeIndex = rangeStart; rangeIndex < rangeEnd; ++rangeIndex) {
136 DictionaryEntry::ConstIterator item(rangeIndex + length);
137 words.append(t: *item);
138 }
139
140 return words;
141}
142

source code of qtvirtualkeyboard/src/plugins/tcime/3rdparty/tcime/cangjiedictionary.cpp