83 lines
3.0 KiB
C++
83 lines
3.0 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LATINIME_TERMINAL_ATTRIBUTES_H
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#define LATINIME_TERMINAL_ATTRIBUTES_H
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#include "binary_format.h"
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namespace latinime {
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/**
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* This class encapsulates information about a terminal that allows to
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* retrieve local node attributes like the list of shortcuts without
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* exposing the format structure to the client.
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*/
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class TerminalAttributes {
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public:
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class ShortcutIterator {
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const uint8_t *const mDict;
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bool mHasNextShortcutTarget;
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int mPos;
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public:
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ShortcutIterator(const uint8_t *dict, const int pos, const uint8_t flags) : mDict(dict),
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mPos(pos) {
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mHasNextShortcutTarget = (0 != (flags & BinaryFormat::FLAG_HAS_SHORTCUT_TARGETS));
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}
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inline bool hasNextShortcutTarget() const {
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return mHasNextShortcutTarget;
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}
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// Gets the shortcut target itself as a uint16_t string. For parameters and return value
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// see BinaryFormat::getWordAtAddress.
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// TODO: make the output an uint32_t* to handle the whole unicode range.
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inline int getNextShortcutTarget(const int maxDepth, uint16_t *outWord) {
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const int shortcutFlags = BinaryFormat::getFlagsAndForwardPointer(mDict, &mPos);
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mHasNextShortcutTarget =
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0 != (shortcutFlags & BinaryFormat::FLAG_ATTRIBUTE_HAS_NEXT);
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unsigned int i;
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for (i = 0; i < MAX_WORD_LENGTH_INTERNAL; ++i) {
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const int charCode = BinaryFormat::getCharCodeAndForwardPointer(mDict, &mPos);
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if (NOT_A_CHARACTER == charCode) break;
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outWord[i] = (uint16_t)charCode;
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}
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mPos += BinaryFormat::CHARACTER_ARRAY_TERMINATOR_SIZE;
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return i;
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}
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};
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(TerminalAttributes);
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const uint8_t *const mDict;
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const uint8_t mFlags;
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const int mStartPos;
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public:
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TerminalAttributes(const uint8_t *const dict, const uint8_t flags, const int pos) :
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mDict(dict), mFlags(flags), mStartPos(pos) {
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}
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inline ShortcutIterator getShortcutIterator() const {
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// The size of the shortcuts is stored here so that the whole shortcut chunk can be
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// skipped quickly, so we ignore it.
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return ShortcutIterator(mDict, mStartPos + BinaryFormat::SHORTCUT_LIST_SIZE_SIZE, mFlags);
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}
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};
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} // namespace latinime
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#endif // LATINIME_TERMINAL_ATTRIBUTES_H
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